openrtc_tauri_plugin/

lib.rs

use std::collections::{BTreeSet, HashMap};
use std::path::PathBuf;
use std::sync::atomic::{AtomicU64, Ordering};
use std::sync::{Arc, RwLock};

use base64::Engine as _;
use ed25519_dalek::{Signature, VerifyingKey};
use openrtc::application_crypto_streams::{PeerRecvStream, PeerSendStream};
use serde::{Deserialize, Serialize};
#[cfg(feature = "managed-group-encryption")]
use sha2::{Digest, Sha256};
use tauri::ipc::{Channel, InvokeBody, Request, Response};
use tauri::{Manager, Runtime};
use tokio::sync::Mutex;

#[cfg(feature = "native-broadcast-moq")]
mod native_broadcast_moq;

const PLUGIN_NAME: &str = "openrtc-tauri-plugin";
const PEER_BI_STREAM_ID_HEADER: &str = "x-openrtc-stream-id";
const PEER_ID_HEADER: &str = "x-openrtc-peer-id";
const FANOUT_CAPABILITY_HEADER: &str = "x-openrtc-fanout-capability";
const FANOUT_SOURCE_PEER_HEADER: &str = "x-openrtc-fanout-source-peer";
const FANOUT_APP_TAG_HEADER: &str = "x-openrtc-fanout-app-tag";
const MEDIA_PUBLICATION_ID_HEADER: &str = "x-openrtc-publication-id";
const MEDIA_TIMESTAMP_US_HEADER: &str = "x-openrtc-timestamp-us";
const MEDIA_DURATION_US_HEADER: &str = "x-openrtc-duration-us";
const MEDIA_KEYFRAME_HEADER: &str = "x-openrtc-keyframe";
const MEDIA_DISCARDABLE_HEADER: &str = "x-openrtc-discardable";

fn request_body_bytes(request: &Request<'_>) -> Result<Vec<u8>, String> {
    match request.body() {
        InvokeBody::Raw(bytes) => Ok(bytes.clone()),
        // Tauri Android can forward typed-array command bodies through JSON.
        // Preserve one command contract without falling back to global events.
        InvokeBody::Json(json) => serde_json::from_value::<Vec<u8>>(json.clone())
            .map_err(|error| format!("invalid binary IPC payload: {error}")),
    }
}

fn required_request_header(request: &Request<'_>, name: &str) -> Result<String, String> {
    request
        .headers()
        .get(name)
        .and_then(|value| value.to_str().ok())
        .map(str::trim)
        .filter(|value| !value.is_empty())
        .map(ToOwned::to_owned)
        .ok_or_else(|| format!("{name} header is required"))
}

fn parsed_request_header<T>(request: &Request<'_>, name: &str) -> Result<T, String>
where
    T: std::str::FromStr,
    T::Err: std::fmt::Display,
{
    required_request_header(request, name)?
        .parse::<T>()
        .map_err(|error| format!("invalid {name} header: {error}"))
}

pub type InstallFuture = std::pin::Pin<
    Box<
        dyn std::future::Future<Output = Result<Box<dyn std::any::Any + Send + Sync>, String>>
            + Send,
    >,
>;

pub type BroadcastAdapterFuture<'a> = std::pin::Pin<
    Box<
        dyn std::future::Future<
                Output = Result<Option<openrtc::broadcast::BroadcastAdapterObservation>, String>,
            > + Send
            + 'a,
    >,
>;

pub type BroadcastObjectsFuture<'a> =
    std::pin::Pin<Box<dyn std::future::Future<Output = Result<Vec<Vec<u8>>, String>> + Send + 'a>>;

/// Private native relay mechanics boundary. Implementations resolve the
/// non-secret allocation label to provider credentials inside Rust and never
/// return those credentials through Tauri IPC.
pub trait NativeBroadcastAdapter: Send + Sync {
    fn apply(
        &self,
        session: openrtc::broadcast::BroadcastSession,
        action: openrtc::broadcast::BroadcastAdapterAction,
    ) -> BroadcastAdapterFuture<'_>;

    /// Drains provider objects for a subscriber. The plugin passes every
    /// object back through the shared Rust integrity/generation/media decoder
    /// before returning a high-level media sample over IPC.
    fn take_inbound_objects(
        &self,
        _session: openrtc::broadcast::BroadcastSession,
        _max: usize,
    ) -> BroadcastObjectsFuture<'_> {
        Box::pin(async { Ok(Vec::new()) })
    }
}

#[derive(Debug, Clone)]
pub struct InstallContext {
    /// Stable host-owned storage used by every native endpoint initializer.
    /// Installers must derive their Iroh identity from this directory rather
    /// than creating a transport-specific identity.
    pub data_dir: PathBuf,
}

/// Host-supplied implementation for a native transport that cannot be bundled
/// in the publishable Tauri plugin. The OpenRTC constructor remains the sole
/// activation switch; registering an installer only declares compiled support.
pub trait TransportInstaller: Send + Sync {
    fn id(&self) -> &'static str;
    fn is_requested(&self, config: &openrtc::client::TransportConfig) -> bool;
    fn install(
        &self,
        client: Arc<openrtc::client::Client>,
        config: openrtc::client::TransportConfig,
        context: InstallContext,
    ) -> InstallFuture;
}

/// Host-owned private-storage bridge for the OpenRTC 2.0 per-install device
/// proof key. OpenRTC never receives private key bytes and does not prescribe
/// an interactive OS credential store. The host exposes only public JWK export
/// and signing; Plutonium's current shipping owner is its prompt-free,
/// app-private store.
pub trait DeviceKeySigner: Send + Sync {
    fn public_jwk(&self, app_tag: &str) -> Result<serde_json::Value, String>;
    fn sign(&self, app_tag: &str, challenge: &[u8]) -> Result<Vec<u8>, String>;

    /// Host-certified strength of the signer's private-key custody.
    /// Software is the safe default; only the native host may override it.
    fn offline_assurance(&self, _app_tag: &str) -> openrtc::offline::OfflineAssurance {
        openrtc::offline::OfflineAssurance::Software
    }
    fn delete(&self, app_tag: &str) -> Result<(), String>;
    fn read_secure_record(&self, _app_tag: &str, _key: &str) -> Result<Option<String>, String> {
        Ok(None)
    }
    fn write_secure_record(&self, _app_tag: &str, _key: &str, _value: &str) -> Result<(), String> {
        Err("OpenRTC 2.0 native certificate persistence requires a host secure store".to_string())
    }
    fn delete_secure_record(&self, _app_tag: &str, _key: &str) -> Result<(), String> {
        Ok(())
    }
}

struct OfflineDeviceSigner<'a> {
    signer: &'a dyn DeviceKeySigner,
    app_tag: &'a str,
}

impl openrtc::offline::OfflineSigner for OfflineDeviceSigner<'_> {
    fn verifying_key(&self) -> anyhow::Result<VerifyingKey> {
        let jwk = self
            .signer
            .public_jwk(self.app_tag)
            .map_err(anyhow::Error::msg)?;
        validate_public_device_jwk(&jwk).map_err(anyhow::Error::msg)?;
        let encoded = jwk
            .get("x")
            .and_then(serde_json::Value::as_str)
            .ok_or_else(|| anyhow::anyhow!("OpenRTC device JWK is missing x"))?;
        let bytes = base64::engine::general_purpose::URL_SAFE_NO_PAD
            .decode(encoded)
            .map_err(|error| anyhow::anyhow!("decode OpenRTC device JWK: {error}"))?;
        let bytes: [u8; 32] = bytes
            .try_into()
            .map_err(|_| anyhow::anyhow!("OpenRTC device JWK must contain 32 key bytes"))?;
        VerifyingKey::from_bytes(&bytes)
            .map_err(|error| anyhow::anyhow!("parse OpenRTC device JWK: {error}"))
    }

    fn sign(&self, message: &[u8]) -> anyhow::Result<Signature> {
        let bytes = self
            .signer
            .sign(self.app_tag, message)
            .map_err(anyhow::Error::msg)?;
        Signature::from_slice(&bytes)
            .map_err(|error| anyhow::anyhow!("parse OpenRTC device signature: {error}"))
    }
}

#[derive(Debug, Clone, Serialize)]
#[serde(rename_all = "camelCase")]
struct OfflineRuntimeSupport {
    provisioning: bool,
    local_mesh: bool,
    cloud_required: bool,
    #[serde(skip_serializing_if = "Option::is_none")]
    reason: Option<&'static str>,
}

struct InstalledNativeTransport {
    client_ptr: usize,
    _runtime: Box<dyn std::any::Any + Send + Sync>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct OpenRtcTauriConfig {
    /// Public OpenRTC developer API key. The app identity is derived locally;
    /// consumers cannot retarget the native runtime with an app tag or
    /// provider project identifier.
    pub api_key: String,
    #[serde(default)]
    pub data_dir: Option<PathBuf>,
    #[serde(default)]
    pub transport_config: Option<openrtc::client::TransportConfig>,
}

impl Default for OpenRtcTauriConfig {
    fn default() -> Self {
        Self {
            api_key: String::new(),
            data_dir: None,
            transport_config: None,
        }
    }
}

impl OpenRtcTauriConfig {
    pub fn from_env() -> Self {
        let api_key = first_env(&[
            "VITE_OPENRTC_KEY",
            "VITE_OPENRTC_API_KEY",
            "VITE_PLUTO_OPENRTC_API_KEY",
            "OPENRTC_API_KEY",
        ]);
        Self {
            api_key: api_key.unwrap_or_default(),
            data_dir: None,
            transport_config: None,
        }
    }

    pub fn validated_api_key(&self) -> Result<&str, String> {
        openrtc::validate_api_key(&self.api_key)
            .map_err(|error| format!("invalid OpenRTC 2.0 public API key: {error}"))
    }

    pub fn app_tag(&self) -> Result<String, String> {
        self.validated_api_key().map(openrtc::app_tag_from_api_key)
    }
}

fn first_env(names: &[&str]) -> Option<String> {
    names.iter().find_map(|name| {
        std::env::var(name)
            .ok()
            .map(|value| value.trim().to_string())
            .filter(|value| !value.is_empty())
    })
}

#[derive(Default)]
struct TokenRelayState {
    identity_credential: RwLock<Option<String>>,
}

impl TokenRelayState {
    fn token_provider(self: &Arc<Self>) -> Box<dyn Fn() -> Option<String> + Send + Sync> {
        let relay = self.clone();
        Box::new(move || {
            relay
                .identity_credential
                .read()
                .ok()
                .and_then(|guard| guard.clone())
        })
    }

    fn set(&self, identity_credential: Option<String>) {
        if let Ok(mut guard) = self.identity_credential.write() {
            *guard = normalize_token(identity_credential);
        }
    }
}

fn normalize_token(value: Option<String>) -> Option<String> {
    value
        .map(|value| value.trim().to_string())
        .filter(|value| !value.is_empty())
}

#[derive(Debug, Clone)]
struct NativeCapabilityRegistration {
    avenue_kind: String,
    avenue_id: String,
    sparse_fanout: bool,
    requested_architecture: Option<openrtc::native::RoomArchitectureMode>,
    desired_revision: u64,
    desired_peers: Vec<serde_json::Value>,
}

impl NativeCapabilityRegistration {
    fn uses_sparse_fanout(&self) -> bool {
        self.requested_architecture
            .map(|requested| requested == openrtc::native::RoomArchitectureMode::Sparse)
            .unwrap_or(self.sparse_fanout)
    }
}

#[derive(Debug, Default)]
struct NativeCapabilityRegistry {
    registrations: HashMap<String, NativeCapabilityRegistration>,
    root_desired_revision: u64,
}

impl NativeCapabilityRegistry {
    #[cfg(test)]
    fn register(
        &mut self,
        capability_key: String,
        avenue_kind: String,
        avenue_id: String,
        sparse_fanout: bool,
    ) -> Result<(), String> {
        self.register_with_architecture(capability_key, avenue_kind, avenue_id, sparse_fanout, None)
    }

    fn register_with_architecture(
        &mut self,
        capability_key: String,
        avenue_kind: String,
        avenue_id: String,
        sparse_fanout: bool,
        requested_architecture: Option<openrtc::native::RoomArchitectureMode>,
    ) -> Result<(), String> {
        if requested_architecture.is_some() && avenue_kind != "room" {
            return Err("native room architecture is valid only for room avenues".to_string());
        }
        if let Some(existing) = self.registrations.get(&capability_key) {
            if existing.avenue_kind == avenue_kind
                && existing.avenue_id == avenue_id
                && existing.sparse_fanout == sparse_fanout
                && existing.requested_architecture == requested_architecture
            {
                return Ok(());
            }
            return Err(format!(
                "native capability key {capability_key} is already registered for another avenue"
            ));
        }
        self.registrations.insert(
            capability_key,
            NativeCapabilityRegistration {
                avenue_kind,
                avenue_id,
                sparse_fanout,
                requested_architecture,
                desired_revision: 0,
                desired_peers: Vec::new(),
            },
        );
        Ok(())
    }

    fn capability_keys_for_identity(
        &self,
        connection_id: Option<&str>,
        device_id: Option<&str>,
        device_id_hint: Option<&str>,
        remote_node_id: Option<&str>,
    ) -> Vec<String> {
        let identities = [connection_id, device_id, device_id_hint, remote_node_id]
            .into_iter()
            .flatten()
            .map(str::trim)
            .filter(|value| !value.is_empty())
            .collect::<BTreeSet<_>>();
        self.registrations
            .iter()
            .filter_map(|(key, registration)| {
                registration
                    .desired_peers
                    .iter()
                    .any(|peer| {
                        ["connectionId", "deviceId", "nodeId"]
                            .into_iter()
                            .filter_map(|field| peer.get(field).and_then(serde_json::Value::as_str))
                            .map(str::trim)
                            .any(|value| identities.contains(value))
                    })
                    .then(|| key.clone())
            })
            .collect::<BTreeSet<_>>()
            .into_iter()
            .collect()
    }

    fn capability_keys_for_state(&self, snapshot: &openrtc::client::StateSnapshot) -> Vec<String> {
        self.capability_keys_for_identity(
            Some(&snapshot.connection_id),
            snapshot.device_id.as_deref(),
            snapshot.device_id_hint.as_deref(),
            snapshot.remote_node_id.as_deref(),
        )
    }

    fn capability_keys_for_peer_data(
        &self,
        event: &openrtc::client::NativePeerDataEvent,
    ) -> Vec<String> {
        if let Ok(value) = serde_json::from_slice::<serde_json::Value>(&event.payload) {
            if let Some(capability) = value
                .get("capability")
                .and_then(serde_json::Value::as_str)
                .map(str::trim)
                .filter(|value| !value.is_empty())
            {
                if self.registrations.contains_key(capability) {
                    return vec![capability.to_string()];
                }
                return Vec::new();
            }
        }
        // Peer-data is an application effect, not a connection observation.
        // It must carry the capability already validated by the Rust ingress
        // owner; a shared physical peer is never enough to infer one or more
        // avenue recipients.
        Vec::new()
    }

    fn projected_stream_capability(
        &self,
        channel: &openrtc::stream_metadata::ChannelMetadata,
    ) -> Option<String> {
        let explicit = channel
            .metadata
            .as_ref()
            .and_then(|metadata| metadata.get("openrtcCapability"))
            .and_then(serde_json::Value::as_str)
            .map(str::trim)
            .filter(|value| !value.is_empty());
        match explicit {
            Some(key) if self.registrations.contains_key(key) => Some(key.to_string()),
            _ => None,
        }
    }

    fn aggregate_desired_peers(&mut self) -> Result<(u64, String), String> {
        let role_priority = |value: &serde_json::Value| match value
            .get("topologyRole")
            .and_then(serde_json::Value::as_str)
        {
            // A non-sparse capability is an unconditional desired reference
            // and must never be retired by a sparse avenue transition.
            None => 3_u8,
            Some("active") => 2,
            Some("backup") => 1,
            Some(_) => 0,
        };
        let route_evidence = |value: &serde_json::Value| {
            ["ticket", "nodeId"]
                .into_iter()
                .filter(|field| {
                    value
                        .get(field)
                        .and_then(serde_json::Value::as_str)
                        .is_some_and(|part| !part.trim().is_empty())
                })
                .count()
        };
        let mut references =
            std::collections::BTreeMap::<String, Vec<(&str, &serde_json::Value)>>::new();
        let mut registrations = self.registrations.iter().collect::<Vec<_>>();
        registrations.sort_by(|(left, _), (right, _)| left.cmp(right));
        for (capability_key, registration) in registrations {
            for peer in &registration.desired_peers {
                let identity = ["deviceId", "nodeId", "ticket"]
                    .into_iter()
                    .find_map(|field| peer.get(field).and_then(serde_json::Value::as_str))
                    .map(str::trim)
                    .filter(|value| !value.is_empty())
                    .ok_or_else(|| "desired peer has no stable identity".to_string())?;
                references
                    .entry(identity.to_string())
                    .or_default()
                    .push((capability_key.as_str(), peer));
            }
        }
        self.root_desired_revision = self.root_desired_revision.saturating_add(1);
        let peers = references
            .into_values()
            .map(|refs| {
                let semantic_priority = refs
                    .iter()
                    .map(|(_, peer)| role_priority(peer))
                    .max()
                    .unwrap_or_default();
                // Pick one complete route atomically. Capability order is the
                // deterministic tie-breaker; avenue-local records remain
                // untouched and continue to own their own role/revision.
                let mut evidence = refs[0];
                for candidate in refs.iter().copied().skip(1) {
                    if (route_evidence(candidate.1), role_priority(candidate.1))
                        > (route_evidence(evidence.1), role_priority(evidence.1))
                    {
                        evidence = candidate;
                    }
                }
                let mut peer = evidence.1.clone();
                if semantic_priority == 3 {
                    if let Some(object) = peer.as_object_mut() {
                        object.remove("topologyRole");
                        object.remove("topologyRevision");
                    }
                } else {
                    peer["topologyRole"] = serde_json::Value::String(
                        if semantic_priority == 2 {
                            "active"
                        } else {
                            "backup"
                        }
                        .to_string(),
                    );
                    peer["topologyRevision"] = serde_json::Value::from(self.root_desired_revision);
                }
                peer
            })
            .collect::<Vec<_>>();
        let payload = serde_json::to_string(&peers)
            .map_err(|error| format!("serialize aggregated desired peers: {error}"))?;
        Ok((self.root_desired_revision, payload))
    }
}

fn required_native_capability_part(value: String, label: &str) -> Result<String, String> {
    let value = value.trim().to_string();
    if value.is_empty()
        || value.len() > 192
        || !value
            .chars()
            .all(|character| character.is_ascii_alphanumeric() || "_.:@-".contains(character))
    {
        return Err(format!("native {label} is invalid"));
    }
    Ok(value)
}

pub struct OpenRtcTauriState {
    client: RwLock<Arc<openrtc::client::Client>>,
    config: OpenRtcTauriConfig,
    token_relay: Arc<TokenRelayState>,
    data_dir: Option<PathBuf>,
    connection_state_forwarder: std::sync::Mutex<Option<tauri::async_runtime::JoinHandle<()>>>,
    peer_data_forwarder: std::sync::Mutex<Option<tauri::async_runtime::JoinHandle<()>>>,
    presence_loop_active: Mutex<bool>,
    subscriptions: Mutex<HashMap<String, tokio::task::JoinHandle<()>>>,
    native_projection_subscription: Arc<Mutex<Option<NativeProjectionSubscription>>>,
    projected_stream_offered: AtomicU64,
    projected_stream_decoded: AtomicU64,
    projected_stream_projected: AtomicU64,
    projected_stream_unhandled_non_channel: AtomicU64,
    projected_stream_unhandled_other_channel: AtomicU64,
    projected_stream_unhandled_no_subscription: AtomicU64,
    projected_stream_failures: AtomicU64,
    projected_stream_last_transport_stable_id: AtomicU64,
    projected_stream_validation_checks: AtomicU64,
    projected_stream_validation_rejections: AtomicU64,
    projected_stream_last_validated_transport_stable_id: AtomicU64,
    projected_stream_authorized: AtomicU64,
    projected_stream_unauthorized: AtomicU64,
    projected_stream_last_channel: Mutex<Option<String>>,
    projected_stream_last_protocol: Mutex<Option<String>>,
    projected_stream_last_connection_id: Mutex<Option<String>>,
    projected_stream_last_remote_node_id: Mutex<Option<String>>,
    peer_bi_streams: Mutex<HashMap<String, PeerBiStreamHandle>>,
    peer_uni_streams: Mutex<HashMap<String, Arc<Mutex<Option<PeerSendStream>>>>>,
    portable_media: Mutex<openrtc::media::PortableMediaSession>,
    broadcast_sessions: Mutex<HashMap<String, openrtc::broadcast::BroadcastSession>>,
    broadcast_signers: Mutex<HashMap<String, openrtc::broadcast::BroadcastPublisherSigner>>,
    broadcast_drivers: Mutex<HashMap<String, Arc<Mutex<()>>>>,
    managed_session_start_guard: Mutex<()>,
    managed_session_next_owner_epoch: AtomicU64,
    managed_session: Mutex<Option<ManagedSessionRecord>>,
    capability_registry: Arc<Mutex<NativeCapabilityRegistry>>,
    native_transport_installers: Vec<Arc<dyn TransportInstaller>>,
    installed_native_transports: Mutex<HashMap<&'static str, InstalledNativeTransport>>,
    native_device_key_signer: Option<Arc<dyn DeviceKeySigner>>,
    native_broadcast_adapter: Option<Arc<dyn NativeBroadcastAdapter>>,
    #[cfg(feature = "managed-group-encryption")]
    managed_groups: Mutex<HashMap<String, openrtc::native::NativeManagedGroupController>>,
    #[cfg(feature = "native-broadcast-moq")]
    native_broadcast_moq_adapter: Option<Arc<native_broadcast_moq::NativeBroadcastMoqAdapter>>,
}

#[derive(Debug, Clone, serde::Serialize)]
#[serde(rename_all = "camelCase")]
struct NativeRuntimeStatusResponse {
    #[serde(flatten)]
    status: openrtc::client::RuntimeStatus,
    product_maturity: openrtc::client::ProductCapabilityMaturity,
}

impl OpenRtcTauriState {
    pub fn new(config: OpenRtcTauriConfig) -> Self {
        openrtc::ensure_rustls();

        let token_relay = Arc::new(TokenRelayState::default());
        let client = build_client(&config, &token_relay)
            .expect("OpenRTC Tauri 2.0 requires a valid public API key");
        let data_dir = config.data_dir.clone();
        #[cfg(feature = "native-broadcast-moq")]
        let native_broadcast_moq_adapter =
            Arc::new(native_broadcast_moq::NativeBroadcastMoqAdapter::new());

        Self {
            client: RwLock::new(client),
            config,
            token_relay,
            data_dir,
            connection_state_forwarder: std::sync::Mutex::new(None),
            peer_data_forwarder: std::sync::Mutex::new(None),
            presence_loop_active: Mutex::new(false),
            subscriptions: Mutex::new(HashMap::new()),
            native_projection_subscription: Arc::new(Mutex::new(None)),
            projected_stream_offered: AtomicU64::new(0),
            projected_stream_decoded: AtomicU64::new(0),
            projected_stream_projected: AtomicU64::new(0),
            projected_stream_unhandled_non_channel: AtomicU64::new(0),
            projected_stream_unhandled_other_channel: AtomicU64::new(0),
            projected_stream_unhandled_no_subscription: AtomicU64::new(0),
            projected_stream_failures: AtomicU64::new(0),
            projected_stream_last_transport_stable_id: AtomicU64::new(0),
            projected_stream_validation_checks: AtomicU64::new(0),
            projected_stream_validation_rejections: AtomicU64::new(0),
            projected_stream_last_validated_transport_stable_id: AtomicU64::new(0),
            projected_stream_authorized: AtomicU64::new(0),
            projected_stream_unauthorized: AtomicU64::new(0),
            projected_stream_last_channel: Mutex::new(None),
            projected_stream_last_protocol: Mutex::new(None),
            projected_stream_last_connection_id: Mutex::new(None),
            projected_stream_last_remote_node_id: Mutex::new(None),
            peer_bi_streams: Mutex::new(HashMap::new()),
            peer_uni_streams: Mutex::new(HashMap::new()),
            portable_media: Mutex::new(openrtc::media::PortableMediaSession::default()),
            broadcast_sessions: Mutex::new(HashMap::new()),
            broadcast_signers: Mutex::new(HashMap::new()),
            broadcast_drivers: Mutex::new(HashMap::new()),
            managed_session_start_guard: Mutex::new(()),
            managed_session_next_owner_epoch: AtomicU64::new(0),
            managed_session: Mutex::new(None),
            capability_registry: Arc::new(Mutex::new(NativeCapabilityRegistry::default())),
            native_transport_installers: Vec::new(),
            installed_native_transports: Mutex::new(HashMap::new()),
            native_device_key_signer: None,
            #[cfg(feature = "managed-group-encryption")]
            managed_groups: Mutex::new(HashMap::new()),
            native_broadcast_adapter: {
                #[cfg(feature = "native-broadcast-moq")]
                {
                    Some(native_broadcast_moq_adapter.clone())
                }
                #[cfg(not(feature = "native-broadcast-moq"))]
                {
                    None
                }
            },
            #[cfg(feature = "native-broadcast-moq")]
            native_broadcast_moq_adapter: Some(native_broadcast_moq_adapter),
        }
    }

    pub fn with_native_transport_installer(
        mut self,
        installer: Arc<dyn TransportInstaller>,
    ) -> Self {
        self.native_transport_installers.push(installer);
        self
    }

    pub fn with_native_device_key_signer(mut self, signer: Arc<dyn DeviceKeySigner>) -> Self {
        self.native_device_key_signer = Some(signer);
        self
    }

    fn offline_runtime_support(&self) -> OfflineRuntimeSupport {
        let provisioning = self.native_device_key_signer.is_some();
        OfflineRuntimeSupport {
            provisioning,
            local_mesh: cfg!(feature = "transport-lan"),
            cloud_required: false,
            reason: if !provisioning {
                Some("native host device signer is unavailable")
            } else {
                (!cfg!(feature = "transport-lan"))
                    .then_some("native host was built without transport-lan")
            },
        }
    }

    fn project_public_runtime_status(
        &self,
        status: openrtc::client::RuntimeStatus,
    ) -> NativeRuntimeStatusResponse {
        use openrtc::client::CapabilityMaturity;

        let mut product_maturity = self.client().product_capability_maturity();
        product_maturity.offline_edge = if self.native_device_key_signer.is_none() {
            CapabilityMaturity::Unavailable
        } else if cfg!(feature = "transport-lan") {
            CapabilityMaturity::Preview
        } else {
            CapabilityMaturity::SupportOnly
        };

        // The Rust broadcast core is present, but openrtc/native deliberately
        // has no public BroadcastHost adapter in 2.5. Report the shipping
        // consumer surface, not the private plugin command inventory.
        product_maturity.broadcast = CapabilityMaturity::Unavailable;
        NativeRuntimeStatusResponse {
            status,
            product_maturity,
        }
    }

    pub fn with_native_broadcast_adapter(
        mut self,
        adapter: Arc<dyn NativeBroadcastAdapter>,
    ) -> Self {
        self.native_broadcast_adapter = Some(adapter);
        #[cfg(feature = "native-broadcast-moq")]
        {
            self.native_broadcast_moq_adapter = None;
        }
        self
    }

    #[cfg(feature = "native-broadcast-moq")]
    async fn resolve_native_broadcast_access(
        &self,
        grant: &str,
        publication_verifying_key: Option<&[u8; 32]>,
        expected_issuer_public_key: &[u8; 32],
    ) -> Result<native_broadcast_moq::NativeBroadcastRelayAccess, String> {
        let api_key = self.config.validated_api_key()?;
        let app_tag = self.client().app_tag().to_string();
        let nonce = uuid::Uuid::new_v4().simple().to_string();
        let issued_at = std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .unwrap_or_default()
            .as_secs();
        let (challenge, publication_key) = native_broadcast_moq::broadcast_access_challenge(
            api_key,
            grant,
            publication_verifying_key,
            &nonce,
            issued_at,
        );
        let device_proof = native_broadcast_moq::NativeBroadcastDeviceProof {
            public_key_jwk: self.device_public_key(&app_tag)?,
            signature: self.sign_device_proof(&app_tag, &challenge)?,
            nonce,
            issued_at,
        };
        native_broadcast_moq::resolve_broadcast_access(
            openrtc::native::OPENRTC_PRODUCTION_CONTROL_PLANE,
            api_key,
            grant,
            publication_key.as_deref(),
            device_proof,
            expected_issuer_public_key,
        )
        .await
    }

    fn device_public_key(&self, app_tag: &str) -> Result<serde_json::Value, String> {
        let app_tag = required_app_tag(app_tag)?;
        let signer = self.native_device_key_signer.as_ref().ok_or_else(|| {
            "OpenRTC 2.0 native device proof requires a host secure-storage signer".to_string()
        })?;
        let value = signer.public_jwk(app_tag)?;
        validate_public_device_jwk(&value)?;
        Ok(value)
    }

    fn sign_device_proof(&self, app_tag: &str, challenge: &str) -> Result<String, String> {
        let app_tag = required_app_tag(app_tag)?;
        if challenge.is_empty() || challenge.len() > 2_048 {
            return Err("OpenRTC device challenge is invalid".to_string());
        }
        let signer = self.native_device_key_signer.as_ref().ok_or_else(|| {
            "OpenRTC 2.0 native device proof requires a host secure-storage signer".to_string()
        })?;
        let signature = signer.sign(app_tag, challenge.as_bytes())?;
        if signature.len() != 64 {
            return Err("OpenRTC device signer returned an invalid Ed25519 signature".to_string());
        }
        Ok(base64::engine::general_purpose::URL_SAFE_NO_PAD.encode(signature))
    }

    fn sign_device_message(&self, app_tag: &str, message: &[u8]) -> Result<String, String> {
        let app_tag = required_app_tag(app_tag)?;
        if message.is_empty() || message.len() > 96 * 1024 {
            return Err("OpenRTC device message is invalid".to_string());
        }
        let signer = self.native_device_key_signer.as_ref().ok_or_else(|| {
            "OpenRTC 2.0 native device proof requires a host secure-storage signer".to_string()
        })?;
        let signature = signer.sign(app_tag, message)?;
        if signature.len() != 64 {
            return Err("OpenRTC device signer returned an invalid Ed25519 signature".to_string());
        }
        Ok(base64::engine::general_purpose::URL_SAFE_NO_PAD.encode(signature))
    }

    fn delete_device_key(&self, app_tag: &str) -> Result<(), String> {
        let app_tag = required_app_tag(app_tag)?;
        let signer = self.native_device_key_signer.as_ref().ok_or_else(|| {
            "OpenRTC 2.0 native device proof requires a host secure-storage signer".to_string()
        })?;
        signer.delete(app_tag)
    }

    fn read_secure_record(&self, app_tag: &str, key: &str) -> Result<Option<String>, String> {
        let app_tag = required_app_tag(app_tag)?;
        let key = required_secure_record_key(key)?;
        self.native_device_key_signer
            .as_ref()
            .ok_or_else(|| {
                "OpenRTC 2.0 native certificate persistence requires a host secure store"
                    .to_string()
            })?
            .read_secure_record(app_tag, key)
    }

    fn write_secure_record(&self, app_tag: &str, key: &str, value: &str) -> Result<(), String> {
        let app_tag = required_app_tag(app_tag)?;
        let key = required_secure_record_key(key)?;
        if value.is_empty() || value.len() > 16 * 1024 {
            return Err("OpenRTC secure record is invalid".to_string());
        }
        self.native_device_key_signer
            .as_ref()
            .ok_or_else(|| {
                "OpenRTC 2.0 native certificate persistence requires a host secure store"
                    .to_string()
            })?
            .write_secure_record(app_tag, key, value)
    }

    fn delete_secure_record(&self, app_tag: &str, key: &str) -> Result<(), String> {
        let app_tag = required_app_tag(app_tag)?;
        let key = required_secure_record_key(key)?;
        self.native_device_key_signer
            .as_ref()
            .ok_or_else(|| {
                "OpenRTC 2.0 native certificate persistence requires a host secure store"
                    .to_string()
            })?
            .delete_secure_record(app_tag, key)
    }

    pub fn client(&self) -> Arc<openrtc::client::Client> {
        self.client
            .read()
            .map(|guard| guard.clone())
            .expect("OpenRTC Tauri client state is poisoned")
    }

    pub fn set_identity_credential(&self, identity_credential: Option<String>) {
        self.token_relay.set(identity_credential);
    }

    fn allocate_managed_session_owner_epoch(&self) -> u64 {
        self.managed_session_next_owner_epoch
            .fetch_add(1, Ordering::SeqCst)
            + 1
    }

    fn replace_connection_state_forwarder(&self, client: Arc<openrtc::client::Client>) {
        let capability_registry = self.capability_registry.clone();
        let projection_subscription = self.native_projection_subscription.clone();
        let next = tauri::async_runtime::spawn(async move {
            forward_connection_state_events(client, capability_registry, projection_subscription)
                .await;
        });
        if let Ok(mut guard) = self.connection_state_forwarder.lock() {
            if let Some(previous) = guard.replace(next) {
                previous.abort();
            }
        }
    }

    fn replace_peer_data_forwarder(&self, client: Arc<openrtc::client::Client>) {
        let capability_registry = self.capability_registry.clone();
        let projection_subscription = self.native_projection_subscription.clone();
        let next = tauri::async_runtime::spawn(async move {
            forward_peer_data_events(client, capability_registry, projection_subscription).await;
        });
        if let Ok(mut guard) = self.peer_data_forwarder.lock() {
            if let Some(previous) = guard.replace(next) {
                previous.abort();
            }
        }
    }
}

fn build_client(
    config: &OpenRtcTauriConfig,
    token_relay: &Arc<TokenRelayState>,
) -> Result<Arc<openrtc::client::Client>, String> {
    let mut builder = openrtc::client::Client::builder(
        config.validated_api_key()?.to_string(),
        token_relay.token_provider(),
    )
    .map_err(|error| error.to_string())?;
    if let Some(transport_config) = config.transport_config.clone() {
        builder = builder.transport_config(transport_config);
    }
    Ok(Arc::new(builder.build()))
}

fn requested_local_device_id(value: Option<&str>) -> Option<String> {
    value
        .map(str::trim)
        .filter(|value| !value.is_empty())
        .map(ToOwned::to_owned)
}

fn managed_session_device_id(
    _requested: Option<&str>,
    native_identity: &openrtc::native_device::NativeDeviceIdentity,
) -> String {
    // The persisted native identity is the only durable-device authority.
    // Frontend IDs are aliases/display hints and must never create a second
    // gateway device projection or presence lease for the same native node.
    native_identity.device_id.clone()
}

#[cfg(test)]
fn metadata_with_authoritative_device_id(
    metadata: Option<String>,
    device_id: &str,
) -> Option<String> {
    let device_id = device_id.trim();
    if device_id.is_empty() {
        return metadata;
    }

    let Some(raw_metadata) = metadata else {
        return Some(serde_json::json!({ "deviceId": device_id }).to_string());
    };

    match serde_json::from_str::<serde_json::Value>(&raw_metadata) {
        Ok(serde_json::Value::Object(mut map)) => {
            map.insert(
                "deviceId".to_string(),
                serde_json::Value::String(device_id.to_string()),
            );
            Some(serde_json::Value::Object(map).to_string())
        }
        _ => Some(
            serde_json::json!({
                "deviceId": device_id,
                "metadata": raw_metadata,
            })
            .to_string(),
        ),
    }
}

struct PeerBiStreamHandle {
    send: Arc<Mutex<Option<PeerSendStream>>>,
    recv: Option<PeerRecvStream>,
    read_task: Option<tokio::task::JoinHandle<()>>,
}

struct NativeProjectionSubscription {
    request_id: String,
    channel: Channel<NativeProjectionEvent>,
}

#[derive(Serialize, Clone)]
#[serde(rename_all = "camelCase")]
struct NativeProjectionEvent {
    request_id: String,
    kind: &'static str,
    capability_keys: Vec<String>,
    payload: serde_json::Value,
}

#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
pub struct OpenBiResult {
    stream_id: String,
    connection_id: Option<String>,
    remote_node_id: String,
}

#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
pub struct OpenUniResult {
    stream_id: String,
    connection_id: Option<String>,
    remote_node_id: String,
}

#[derive(Serialize, Clone)]
#[serde(rename_all = "camelCase")]
struct IncomingPeerBiStreamEvent {
    request_id: String,
    stream_id: String,
    connection_id: Option<String>,
    remote_node_id: String,
    transport_stable_id: u64,
    channel: Option<openrtc::stream_metadata::ChannelMetadata>,
    application_authorized: bool,
    capability_key: String,
}

#[derive(Debug, Clone, Serialize)]
#[serde(rename_all = "camelCase")]
struct ProjectedStreamDiagnostics {
    subscription_active: bool,
    offered: u64,
    decoded: u64,
    projected: u64,
    unhandled_non_channel: u64,
    unhandled_other_channel: u64,
    unhandled_no_subscription: u64,
    failures: u64,
    last_transport_stable_id: u64,
    validation_checks: u64,
    validation_rejections: u64,
    last_validated_transport_stable_id: u64,
    authorized: u64,
    unauthorized: u64,
    last_channel: Option<String>,
    last_protocol: Option<String>,
    last_connection_id: Option<String>,
    last_remote_node_id: Option<String>,
}

/// Result of offering one already-admitted, already-protected peer stream to
/// the OpenRTC-owned native protocol projection. A host must continue its own
/// protocol dispatch only for `Unhandled`; there is still exactly one owner of
/// the underlying incoming-stream queue.
pub enum ProjectedPeerBiHandoff {
    Handled,
    Unhandled {
        send: PeerSendStream,
        recv: PeerRecvStream,
    },
}

#[derive(Serialize, Clone)]
#[serde(rename_all = "camelCase")]
struct PeerBiStreamClosedEvent {
    r#type: &'static str,
    error: Option<String>,
}

#[derive(Debug, Clone, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct StartSessionResult {
    local_node_id: String,
    ticket_scope: Option<String>,
    ticket: Option<String>,
    presence_started: bool,
    auto_connect_started: bool,
    local_device: openrtc::native_device::NativeDeviceIdentity,
}

#[derive(Clone)]
struct ManagedSessionRecord {
    key: String,
    owner_client: Arc<openrtc::client::Client>,
    owner_epoch: u64,
    result: StartSessionResult,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum SessionDisposition {
    Start,
    Reuse,
    Refresh,
    Replace,
}

fn managed_session_disposition(
    active_key: Option<&str>,
    active_client_matches: bool,
    active_presence_started: bool,
    active_auto_connect_started: bool,
    requested_key: &str,
    requested_presence: bool,
    requested_auto_connect: bool,
) -> SessionDisposition {
    let Some(active_key) = active_key else {
        return SessionDisposition::Start;
    };
    if !active_client_matches || active_key != requested_key {
        return SessionDisposition::Replace;
    }
    if (!requested_presence || active_presence_started)
        && (!requested_auto_connect || active_auto_connect_started)
    {
        SessionDisposition::Reuse
    } else {
        SessionDisposition::Refresh
    }
}

fn revokes_managed_session(scope: &str) -> bool {
    scope.trim() == "user-device"
}

pub fn init<R: Runtime>(config: OpenRtcTauriConfig) -> tauri::plugin::TauriPlugin<R> {
    init_with_state(OpenRtcTauriState::new(config))
}

pub fn init_with_state<R: Runtime>(state: OpenRtcTauriState) -> tauri::plugin::TauriPlugin<R> {
    tauri::plugin::Builder::new(PLUGIN_NAME)
        .setup(move |app, _api| {
            let client = state.client();
            let transport_config = state.config.transport_config.clone();
            // Optional native transports must decorate the endpoint before the
            // host app can initialize the shared Iroh client during its setup.
            // Managed-session startup is too late for custom transports because
            // Iroh endpoint hooks are immutable after bind/adoption.
            let install_context = InstallContext {
                data_dir: app_data_dir(app, &state).map_err(std::io::Error::other)?,
            };
            tauri::async_runtime::block_on(ensure_requested_native_transports(
                &state,
                &client,
                transport_config.as_ref(),
                &install_context,
            ))
            .map_err(std::io::Error::other)?;
            state.replace_connection_state_forwarder(client.clone());
            state.replace_peer_data_forwarder(client);
            app.manage(state);
            Ok(())
        })
        .invoke_handler(tauri::generate_handler![
            openrtc_set_identity_credential,
            openrtc_device_public_key,
            openrtc_sign_device_proof,
            openrtc_delete_device_key,
            openrtc_read_secure_record,
            openrtc_write_secure_record,
            openrtc_delete_secure_record,
            openrtc_offline_runtime_support,
            openrtc_create_offline_enrollment_request,
            openrtc_verify_offline_enrollment_request,
            rtc_native_status,
            get_rtc_local_device_info,
            update_rtc_local_device_name,
            get_iroh_node_id,
            start_iroh_node,
            get_iroh_endpoint_ticket,
            register_session_token,
            get_endpoint_ticket_with_token,
            validate_session_token,
            revoke_session_tokens_by_scope,
            stop_rtc_presence_loop,
            register_rtc_capability,
            openrtc_init_managed_room_group,
            openrtc_handle_managed_room_prepare_page,
            openrtc_handle_managed_room_artifact_chunk,
            openrtc_seal_managed_room_payload,
            openrtc_open_managed_room_payload,
            openrtc_forget_managed_room_group,
            unregister_rtc_capability,
            start_rtc_managed_session,
            start_rtc_external_auto_connect,
            submit_rtc_desired_peers,
            stop_rtc_auto_connect,
            notify_rtc_network_change,
            set_rtc_transport_priority,
            connect_to_device,
            disconnect_device,
            set_auto_connect_excluded,
            set_rtc_external_auto_connect_excluded,
            resolve_rtc_peer_connection_records,
            resolve_rtc_peer_identity,
            get_rtc_peer_session,
            list_rtc_peer_sessions,
            list_rtc_managed_connections,
            wait_for_rtc_settled_peer,
            list_rtc_connection_states,
            get_rtc_connection_state,
            stop_rtc_subscription,
            start_native_projection,
            get_projected_stream_diagnostics,
            is_current_transport_stable_id,
            send_peer_message,
            encode_sparse_fanout_message,
            accept_sparse_fanout_message,
            sparse_fanout_diagnostics,
            prepare_openrtc_broadcast_publisher,
            release_openrtc_broadcast_publisher,
            open_openrtc_broadcast,
            begin_openrtc_broadcast_publication,
            publish_openrtc_broadcast_sample,
            receive_openrtc_broadcast_media,
            revoke_openrtc_broadcast,
            close_openrtc_broadcast,
            record_sparse_fanout_forward_queue_drop,
            is_peer_connected,
            open_peer_bi_stream,
            open_peer_bi_transport_only_stream,
            open_peer_uni_stream,
            write_peer_bi_stream,
            start_peer_bi_stream_read,
            cancel_peer_bi_stream_read,
            close_peer_bi_stream,
            write_peer_uni_stream,
            close_peer_uni_stream,
            begin_openrtc_media_publication,
            encode_openrtc_media_sample,
            pause_openrtc_media_publication,
            retire_openrtc_media_publication,
            retire_openrtc_media_receiver,
            decode_openrtc_media_chunk,
            decode_openrtc_media_control,
        ])
        .build()
}

pub fn init_from_env<R: Runtime>() -> tauri::plugin::TauriPlugin<R> {
    init(OpenRtcTauriConfig::from_env())
}

async fn send_native_projection<T: Serialize>(
    subscription: &Arc<Mutex<Option<NativeProjectionSubscription>>>,
    kind: &'static str,
    capability_keys: Vec<String>,
    payload: &T,
) {
    if capability_keys.is_empty() {
        return;
    }
    let Ok(payload) = serde_json::to_value(payload) else {
        return;
    };
    let target = subscription.lock().await.as_ref().map(|subscription| {
        (
            subscription.request_id.clone(),
            subscription.channel.clone(),
        )
    });
    let Some((request_id, channel)) = target else {
        return;
    };
    let _ = channel.send(NativeProjectionEvent {
        request_id,
        kind,
        capability_keys,
        payload,
    });
}

async fn forward_connection_state_events(
    client: Arc<openrtc::client::Client>,
    capability_registry: Arc<Mutex<NativeCapabilityRegistry>>,
    projection_subscription: Arc<Mutex<Option<NativeProjectionSubscription>>>,
) {
    let mut rx = client.connection_state_updates();
    while let Ok(snapshot) = rx.recv().await {
        let keys = capability_registry
            .lock()
            .await
            .capability_keys_for_state(&snapshot);
        send_native_projection(
            &projection_subscription,
            "connection-state",
            keys,
            &snapshot,
        )
        .await;
    }
}

async fn forward_peer_data_events(
    client: Arc<openrtc::client::Client>,
    capability_registry: Arc<Mutex<NativeCapabilityRegistry>>,
    projection_subscription: Arc<Mutex<Option<NativeProjectionSubscription>>>,
) {
    let mut rx = client.subscribe_native_peer_data();
    while let Ok(event) = rx.recv().await {
        let keys = capability_registry
            .lock()
            .await
            .capability_keys_for_peer_data(&event);
        send_native_projection(&projection_subscription, "peer-data", keys, &event).await;
    }
}

async fn replay_current_connection_states(state: &OpenRtcTauriState) {
    let snapshots = state.client().connection_states().await;
    let registry = state.capability_registry.lock().await;
    for snapshot in snapshots {
        let keys = registry.capability_keys_for_state(&snapshot);
        send_native_projection(
            &state.native_projection_subscription,
            "connection-state",
            keys,
            &snapshot,
        )
        .await;
    }
}

fn app_data_dir<R: Runtime>(
    app: &tauri::AppHandle<R>,
    state: &OpenRtcTauriState,
) -> Result<PathBuf, String> {
    state
        .data_dir
        .clone()
        .or_else(|| app.path().app_data_dir().ok())
        .ok_or_else(|| "failed to resolve OpenRTC app data directory".to_string())
}

async fn ensure_iroh_node(client: Arc<openrtc::client::Client>) -> Result<String, String> {
    if let Some(node_id) = client.current_node_id().await {
        return Ok(node_id);
    }
    client
        .init_iroh(None, Vec::new())
        .await
        .map_err(|error| format!("failed to initialize OpenRTC Iroh node: {error}"))
}

async fn ensure_requested_native_transports(
    state: &OpenRtcTauriState,
    client: &Arc<openrtc::client::Client>,
    transports: Option<&openrtc::client::TransportConfig>,
    context: &InstallContext,
) -> Result<(), String> {
    let Some(transports) = transports else {
        return Ok(());
    };
    let ble_requested = transports.ble.as_ref().is_some_and(|config| config.enabled);
    if ble_requested
        && !state
            .native_transport_installers
            .iter()
            .any(|installer| installer.is_requested(transports))
    {
        eprintln!(
            "[openrtc-tauri][transport] BLE requested but unavailable: this host did not register a BLE transport installer; continuing on the Iroh base route"
        );
        return Ok(());
    }
    let client_ptr = Arc::as_ptr(client) as usize;
    for installer in &state.native_transport_installers {
        if !installer.is_requested(transports) {
            continue;
        }
        let already_installed = state
            .installed_native_transports
            .lock()
            .await
            .get(installer.id())
            .is_some_and(|installed| installed.client_ptr == client_ptr);
        if already_installed {
            continue;
        }
        if client.current_node_id().await.is_some() {
            eprintln!(
                "[openrtc-tauri][transport] {} requested after native node startup; continuing on the Iroh base route",
                installer.id()
            );
            continue;
        }
        let runtime = match installer
            .install(client.clone(), transports.clone(), context.clone())
            .await
        {
            Ok(runtime) => runtime,
            Err(error) => {
                eprintln!(
                    "[openrtc-tauri][transport] {} unavailable: {}; continuing on the Iroh base route",
                    installer.id(),
                    error
                );
                continue;
            }
        };
        state.installed_native_transports.lock().await.insert(
            installer.id(),
            InstalledNativeTransport {
                client_ptr,
                _runtime: runtime,
            },
        );
    }
    Ok(())
}

async fn register_peer_bi_stream(
    state: &OpenRtcTauriState,
    connection_id: Option<String>,
    remote_node_id: String,
    send: PeerSendStream,
    recv: PeerRecvStream,
) -> OpenBiResult {
    let stream_id = uuid::Uuid::new_v4().to_string();
    let send = Arc::new(Mutex::new(Some(send)));

    state.peer_bi_streams.lock().await.insert(
        stream_id.clone(),
        PeerBiStreamHandle {
            send,
            // Streams stay paused until JavaScript supplies its ordered Tauri
            // Channel. This prevents byte zero from racing listener setup.
            recv: Some(recv),
            read_task: None,
        },
    );

    OpenBiResult {
        stream_id,
        connection_id,
        remote_node_id,
    }
}

async fn read_peer_exact(recv: &mut PeerRecvStream, buffer: &mut [u8]) -> std::io::Result<()> {
    let mut offset = 0;
    while offset < buffer.len() {
        let read = recv.read(&mut buffer[offset..]).await?;
        if read == 0 {
            return Err(std::io::Error::new(
                std::io::ErrorKind::UnexpectedEof,
                "peer stream ended during channel classification",
            ));
        }
        offset += read;
    }
    Ok(())
}

fn is_openrtc_projected_channel(channel: &openrtc::stream_metadata::ChannelMetadata) -> bool {
    channel.channel_id == openrtc::stream_metadata::PUBLIC_PEER_STREAM_CHANNEL_ID
}

/// Offer an already-admitted and application-protected stream from the
/// embedding native host to OpenRTC's typed IPC projection.
///
/// This is the integration point for Tauri applications that already consume
/// the client's sole `incoming_streams()` queue for product protocols. The
/// helper performs bounded channel-envelope classification and restores every
/// consumed plaintext byte when the stream is not owned by OpenRTC.
pub async fn handoff_projected_peer_bi_stream<R: Runtime>(
    app: tauri::AppHandle<R>,
    connection_id: Option<String>,
    remote_node_id: String,
    transport_stable_id: u64,
    send: PeerSendStream,
    mut recv: PeerRecvStream,
) -> Result<ProjectedPeerBiHandoff, String> {
    let state = app.state::<OpenRtcTauriState>();
    state
        .projected_stream_offered
        .fetch_add(1, Ordering::Relaxed);
    state
        .projected_stream_last_transport_stable_id
        .store(transport_stable_id, Ordering::Relaxed);
    *state.projected_stream_last_connection_id.lock().await = connection_id.clone();
    *state.projected_stream_last_remote_node_id.lock().await = Some(remote_node_id.clone());
    let mut envelope = Vec::new();
    let channel = loop {
        match openrtc::stream_metadata::decode_prefix(&envelope) {
            openrtc::stream_metadata::DecodeDecision::NotMatched => {
                state
                    .projected_stream_unhandled_non_channel
                    .fetch_add(1, Ordering::Relaxed);
                return Ok(ProjectedPeerBiHandoff::Unhandled {
                    send,
                    recv: recv.with_plaintext_prefix(envelope),
                });
            }
            openrtc::stream_metadata::DecodeDecision::Decoded(prefix) => break prefix.channel,
            openrtc::stream_metadata::DecodeDecision::NeedMore(required) => {
                let missing = required.saturating_sub(envelope.len());
                if missing == 0 {
                    return Err("channel-envelope decoder made no progress".to_string());
                }
                let mut bytes = vec![0u8; missing];
                if let Err(error) = read_peer_exact(&mut recv, &mut bytes).await {
                    state
                        .projected_stream_failures
                        .fetch_add(1, Ordering::Relaxed);
                    return Err(format!("read projected channel envelope: {error}"));
                }
                envelope.extend_from_slice(&bytes);
            }
        }
    };
    state
        .projected_stream_decoded
        .fetch_add(1, Ordering::Relaxed);
    *state.projected_stream_last_channel.lock().await = Some(channel.channel_id.clone());
    *state.projected_stream_last_protocol.lock().await = channel
        .metadata
        .as_ref()
        .and_then(|metadata| metadata.get("protocol"))
        .and_then(serde_json::Value::as_str)
        .map(str::to_string);

    if !is_openrtc_projected_channel(&channel) {
        state
            .projected_stream_unhandled_other_channel
            .fetch_add(1, Ordering::Relaxed);
        return Ok(ProjectedPeerBiHandoff::Unhandled {
            send,
            recv: recv.with_plaintext_prefix(envelope),
        });
    }

    let Some(capability_key) = state
        .capability_registry
        .lock()
        .await
        .projected_stream_capability(&channel)
    else {
        // Capability ownership is explicit on the protected channel envelope.
        // Unknown or unscoped descriptors remain available to the embedding
        // host; they are never assigned by listener order or capability count.
        state
            .projected_stream_unhandled_other_channel
            .fetch_add(1, Ordering::Relaxed);
        return Ok(ProjectedPeerBiHandoff::Unhandled {
            send,
            recv: recv.with_plaintext_prefix(envelope),
        });
    };

    let subscription = state.native_projection_subscription.lock().await;
    let Some((request_id, projection_channel)) = subscription.as_ref().map(|subscription| {
        (
            subscription.request_id.clone(),
            subscription.channel.clone(),
        )
    }) else {
        state
            .projected_stream_unhandled_no_subscription
            .fetch_add(1, Ordering::Relaxed);
        return Ok(ProjectedPeerBiHandoff::Unhandled {
            send,
            recv: recv.with_plaintext_prefix(envelope),
        });
    };
    drop(subscription);

    let application_authorized = connection_id.as_deref().is_some_and(|connection_id| {
        matches!(
            state.client().session_admission(connection_id),
            openrtc::session_token::SessionAdmission::Accepted { .. }
        )
    });
    if application_authorized {
        state
            .projected_stream_authorized
            .fetch_add(1, Ordering::Relaxed);
    } else {
        state
            .projected_stream_unauthorized
            .fetch_add(1, Ordering::Relaxed);
    }

    let result = register_peer_bi_stream(
        state.inner(),
        connection_id,
        remote_node_id.clone(),
        send,
        recv,
    )
    .await;
    let event = IncomingPeerBiStreamEvent {
        request_id: request_id.clone(),
        stream_id: result.stream_id.clone(),
        connection_id: result.connection_id,
        remote_node_id,
        transport_stable_id,
        channel: Some(channel),
        application_authorized,
        capability_key: capability_key.clone(),
    };
    let payload = serde_json::to_value(event)
        .map_err(|error| format!("serialize projected peer stream: {error}"))?;
    if let Err(error) = projection_channel.send(NativeProjectionEvent {
        request_id,
        kind: "stream",
        capability_keys: vec![capability_key],
        payload,
    }) {
        state.peer_bi_streams.lock().await.remove(&result.stream_id);
        state
            .projected_stream_failures
            .fetch_add(1, Ordering::Relaxed);
        return Err(format!("send projected peer stream: {error}"));
    }
    state
        .projected_stream_projected
        .fetch_add(1, Ordering::Relaxed);
    Ok(ProjectedPeerBiHandoff::Handled)
}

fn native_stream_trace_enabled() -> bool {
    cfg!(debug_assertions)
        || std::env::var("OPENRTC_NATIVE_STREAM_TRACE").ok().as_deref() == Some("1")
}

fn spawn_peer_bi_stream_reader(
    channel: Channel<Response>,
    stream_id: String,
    mut recv: PeerRecvStream,
) -> tokio::task::JoinHandle<()> {
    tokio::spawn(async move {
        let mut chunk = vec![0_u8; 64 * 1024];
        let mut close_error: Option<String> = None;
        loop {
            match recv.read(&mut chunk).await {
                Ok(0) => break,
                Ok(n) => {
                    if native_stream_trace_enabled() {
                        eprintln!(
                            "[openrtc-tauri][peer-bi-stream] stream_id={} phase=plaintext-chunk bytes={}",
                            stream_id, n
                        );
                    }
                    if channel.send(Response::new(chunk[..n].to_vec())).is_err() {
                        close_error = Some("native stream IPC channel closed".to_string());
                        break;
                    }
                }
                Err(error) => {
                    if native_stream_trace_enabled() {
                        eprintln!(
                            "[openrtc-tauri][peer-bi-stream] stream_id={} phase=read-error error={}",
                            stream_id, error
                        );
                    }
                    close_error = Some(error.to_string());
                    break;
                }
            }
        }
        let close = serde_json::to_string(&PeerBiStreamClosedEvent {
            r#type: "closed",
            error: close_error,
        })
        .expect("peer stream close event serializes");
        let _ = channel.send(Response::new(close));
    })
}

async fn open_peer_bi_with<R: Runtime, F, Fut>(
    _app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
    peer_id: String,
    timeout_ms: Option<u64>,
    open: F,
) -> Result<OpenBiResult, String>
where
    F: FnOnce(Arc<openrtc::client::Client>, String, Option<u64>) -> Fut,
    Fut: std::future::Future<
        Output = anyhow::Result<(Option<String>, String, PeerSendStream, PeerRecvStream)>,
    >,
{
    let peer_id = peer_id.trim().to_string();
    if peer_id.is_empty() {
        return Err("peerId is required".to_string());
    }

    let (connection_id, remote_node_id, send, recv) = open(state.client(), peer_id, timeout_ms)
        .await
        .map_err(|error| format!("open peer bi stream failed: {error}"))?;
    Ok(register_peer_bi_stream(&state, connection_id, remote_node_id, send, recv).await)
}

/// Relay an opaque OpenRTC-issued identity credential into the provider-neutral
/// Rust runtime. The host owns acquisition and renewal; this command never
/// interprets the value as a Firebase token and accepts no refresh token.
#[tauri::command]
async fn openrtc_set_identity_credential(
    state: tauri::State<'_, OpenRtcTauriState>,
    identity_credential: Option<String>,
) -> Result<(), String> {
    state.set_identity_credential(identity_credential);
    if *state.presence_loop_active.lock().await {
        state.client().request_presence_update();
    }
    Ok(())
}

fn required_app_tag(value: &str) -> Result<&str, String> {
    let value = value.trim();
    if value.len() < 5
        || value.len() > 80
        || !value.bytes().all(|byte| {
            byte.is_ascii_alphanumeric() || matches!(byte, b'_' | b'-' | b'.' | b':' | b'@')
        })
    {
        return Err("OpenRTC app tag is invalid".to_string());
    }
    Ok(value)
}

fn validate_public_device_jwk(value: &serde_json::Value) -> Result<(), String> {
    let object = value
        .as_object()
        .ok_or_else(|| "OpenRTC device public key is invalid".to_string())?;
    let x = object
        .get("x")
        .and_then(serde_json::Value::as_str)
        .unwrap_or_default();
    if object.get("kty").and_then(serde_json::Value::as_str) != Some("OKP")
        || object.get("crv").and_then(serde_json::Value::as_str) != Some("Ed25519")
        || object.contains_key("d")
        || x.len() != 43
        || !x
            .bytes()
            .all(|byte| byte.is_ascii_alphanumeric() || matches!(byte, b'_' | b'-'))
    {
        return Err("OpenRTC device public key must be a public Ed25519 JWK".to_string());
    }
    Ok(())
}

fn required_secure_record_key(value: &str) -> Result<&str, String> {
    let value = value.trim();
    if value.is_empty()
        || value.len() > 512
        || !value
            .bytes()
            .all(|byte| byte.is_ascii_alphanumeric() || matches!(byte, b'_' | b'-' | b'.' | b':'))
    {
        return Err("OpenRTC secure record key is invalid".to_string());
    }
    Ok(value)
}

#[tauri::command]
async fn openrtc_device_public_key(
    state: tauri::State<'_, OpenRtcTauriState>,
    app_tag: String,
) -> Result<serde_json::Value, String> {
    state.device_public_key(&app_tag)
}

#[tauri::command]
async fn openrtc_sign_device_proof(
    state: tauri::State<'_, OpenRtcTauriState>,
    app_tag: String,
    challenge: String,
) -> Result<String, String> {
    state.sign_device_proof(&app_tag, &challenge)
}

#[tauri::command]
async fn openrtc_delete_device_key(
    state: tauri::State<'_, OpenRtcTauriState>,
    app_tag: String,
) -> Result<(), String> {
    state.delete_device_key(&app_tag)
}

#[tauri::command]
async fn openrtc_read_secure_record(
    state: tauri::State<'_, OpenRtcTauriState>,
    app_tag: String,
    key: String,
) -> Result<Option<String>, String> {
    state.read_secure_record(&app_tag, &key)
}

#[tauri::command]
async fn openrtc_write_secure_record(
    state: tauri::State<'_, OpenRtcTauriState>,
    app_tag: String,
    key: String,
    value: String,
) -> Result<(), String> {
    state.write_secure_record(&app_tag, &key, &value)
}

#[tauri::command]
async fn openrtc_delete_secure_record(
    state: tauri::State<'_, OpenRtcTauriState>,
    app_tag: String,
    key: String,
) -> Result<(), String> {
    state.delete_secure_record(&app_tag, &key)
}

#[tauri::command]
async fn openrtc_offline_runtime_support(
    state: tauri::State<'_, OpenRtcTauriState>,
) -> Result<OfflineRuntimeSupport, String> {
    Ok(state.offline_runtime_support())
}

#[tauri::command]
async fn openrtc_create_offline_enrollment_request(
    state: tauri::State<'_, OpenRtcTauriState>,
    trust_domain: String,
    device_id: String,
    endpoint_id: String,
    enrollment_nonce: String,
    requested_roles: Vec<String>,
) -> Result<openrtc::offline::OfflineEnrollmentRequest, String> {
    let client = state.client();
    let current_endpoint_id = client.current_node_id().await.ok_or_else(|| {
        "OpenRTC Iroh endpoint must be started before offline enrollment".to_string()
    })?;
    if current_endpoint_id != endpoint_id.trim() {
        return Err(
            "offline enrollment endpoint does not match the native Rust endpoint".to_string(),
        );
    }
    let app_tag = client.app_tag();
    let signer = state
        .native_device_key_signer
        .as_deref()
        .ok_or_else(|| "offline enrollment requires the native host device signer".to_string())?;
    openrtc::offline::OfflineEnrollmentRequest::create(
        &OfflineDeviceSigner { signer, app_tag },
        &trust_domain,
        &device_id,
        &current_endpoint_id,
        &enrollment_nonce,
        requested_roles,
        signer.offline_assurance(app_tag),
        openrtc::session_token::now_unix_ms(),
    )
    .map_err(|error| error.to_string())
}

#[tauri::command]
async fn openrtc_verify_offline_enrollment_request(
    request: openrtc::offline::OfflineEnrollmentRequest,
) -> Result<(), String> {
    request
        .verify()
        .map(|_| ())
        .map_err(|error| error.to_string())
}

#[tauri::command]
async fn rtc_native_status(
    state: tauri::State<'_, OpenRtcTauriState>,
) -> Result<NativeRuntimeStatusResponse, String> {
    Ok(state.project_public_runtime_status(state.client().runtime_status().await))
}

#[tauri::command]
async fn get_rtc_local_device_info<R: Runtime>(
    app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
) -> Result<openrtc::native_device::NativeDeviceIdentity, String> {
    let data_dir = app_data_dir(&app, &state)?;
    state
        .client()
        .init_native_device_identity(data_dir, None)
        .await
        .map_err(|error| error.to_string())
}

#[tauri::command]
async fn update_rtc_local_device_name<R: Runtime>(
    app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
    device_name: String,
) -> Result<openrtc::native_device::NativeDeviceIdentity, String> {
    let data_dir = app_data_dir(&app, &state)?;
    let _ = state
        .client()
        .init_native_device_identity(data_dir, None)
        .await
        .map_err(|error| error.to_string())?;
    state
        .client()
        .update_native_device_name(&device_name)
        .await
        .map_err(|error| error.to_string())
}

#[tauri::command]
async fn get_iroh_node_id(
    state: tauri::State<'_, OpenRtcTauriState>,
) -> Result<Option<String>, String> {
    Ok(state.client().current_node_id().await)
}

#[tauri::command]
async fn start_iroh_node(state: tauri::State<'_, OpenRtcTauriState>) -> Result<String, String> {
    ensure_iroh_node(state.client()).await
}

#[tauri::command]
async fn get_iroh_endpoint_ticket(
    state: tauri::State<'_, OpenRtcTauriState>,
) -> Result<String, String> {
    ensure_iroh_node(state.client()).await?;
    state
        .client()
        .endpoint_ticket()
        .await
        .map_err(|error| error.to_string())
}

#[tauri::command]
async fn register_session_token(
    state: tauri::State<'_, OpenRtcTauriState>,
    token: String,
    scope: String,
    max_connections: u32,
    expires_at_ms: Option<u64>,
) -> Result<(), String> {
    if let Some(expires_at_ms) = expires_at_ms {
        state
            .client()
            .register_token_until(token, scope, max_connections, expires_at_ms);
    } else {
        state
            .client()
            .register_session_token(token, scope, max_connections);
    }
    Ok(())
}

#[tauri::command]
async fn get_endpoint_ticket_with_token(
    state: tauri::State<'_, OpenRtcTauriState>,
    scope: String,
    max_connections: u32,
) -> Result<String, String> {
    ensure_iroh_node(state.client()).await?;
    state
        .client()
        .endpoint_ticket_with_token(&scope, max_connections)
        .await
        .map_err(|error| error.to_string())
}

#[tauri::command]
async fn validate_session_token(
    state: tauri::State<'_, OpenRtcTauriState>,
    token: String,
    connection_id: Option<String>,
) -> Result<String, String> {
    if let Some(connection_id) = connection_id
        .as_deref()
        .map(str::trim)
        .filter(|value| !value.is_empty())
    {
        state
            .client()
            .validate_connection_token(&token, connection_id, None)
            .await
            .map_err(|error| error.to_string())
    } else {
        state.client().validate_session_token(&token)
    }
}

#[tauri::command]
async fn revoke_session_tokens_by_scope(
    state: tauri::State<'_, OpenRtcTauriState>,
    scope: String,
) -> Result<Vec<String>, String> {
    let affected = state.client().revoke_tokens_by_scope(&scope).await;
    if revokes_managed_session(&scope) {
        // The cached managed-session result contains the compound ticket whose
        // token was just revoked. Keeping that record would make the next
        // same-user/device start return a credential the host can no longer
        // validate. Invalidate only this lifecycle cache; the durable native
        // device identity remains intact so explicit reauthentication can
        // re-enroll the same installation with a freshly minted ticket.
        if let Some(previous) = state.managed_session.lock().await.take() {
            previous.owner_client.stop_presence_loop();
            previous.owner_client.stop_auto_connect();
            previous.owner_client.stop_external_auto_connect().await;
        }
        *state.presence_loop_active.lock().await = false;
    }
    Ok(affected)
}

#[tauri::command]
async fn stop_rtc_presence_loop(state: tauri::State<'_, OpenRtcTauriState>) -> Result<(), String> {
    state.client().stop_presence_loop();
    *state.presence_loop_active.lock().await = false;
    if let Some(active) = state.managed_session.lock().await.as_mut() {
        active.result.presence_started = false;
    }
    stop_subscription_by_id(&state, "internal-presence-loop").await;
    Ok(())
}

/// Register one public capability with the Rust-owned native root.
///
/// Owner: openrtc-tauri-plugin native root registry.
/// Consumers: OpenRTC native capability adapters.
/// Introduced: 2026-08-27.
#[tauri::command]
async fn register_rtc_capability(
    state: tauri::State<'_, OpenRtcTauriState>,
    capability_key: String,
    avenue_kind: String,
    avenue_id: String,
    sparse_fanout: Option<bool>,
    architecture: Option<openrtc::native::RoomArchitectureMode>,
) -> Result<(), String> {
    let capability_key = required_native_capability_part(capability_key, "capability key")?;
    let avenue_kind = required_native_capability_part(avenue_kind, "avenue kind")?;
    let avenue_id = required_native_capability_part(avenue_id, "avenue id")?;
    if capability_key != format!("{avenue_kind}:{avenue_id}") {
        return Err("native capability key does not match its avenue".to_string());
    }
    state
        .capability_registry
        .lock()
        .await
        .register_with_architecture(
            capability_key,
            avenue_kind,
            avenue_id,
            sparse_fanout.unwrap_or(false),
            architecture,
        )
}

#[cfg(feature = "managed-group-encryption")]
fn managed_group_state_path<R: Runtime>(
    app: &tauri::AppHandle<R>,
    state: &OpenRtcTauriState,
    capability_key: &str,
    device_id: &str,
) -> Result<PathBuf, String> {
    let mut digest = Sha256::new();
    digest.update(b"openrtc-tauri-managed-group-state-v1:");
    digest.update(state.client().app_tag().as_bytes());
    digest.update(device_id.as_bytes());
    digest.update(capability_key.as_bytes());
    let name = base64::engine::general_purpose::URL_SAFE_NO_PAD.encode(digest.finalize());
    Ok(app_data_dir(app, state)?
        .join("managed-room-state")
        .join(format!("{name}.bin")))
}

#[cfg(feature = "managed-group-encryption")]
fn write_private_managed_group_state(path: &std::path::Path, bytes: &[u8]) -> Result<(), String> {
    if bytes.is_empty() || bytes.len() > 16 * 1024 * 1024 {
        return Err("managed room state exceeds its protected bound".to_string());
    }
    let parent = path
        .parent()
        .ok_or_else(|| "managed room state path has no parent".to_string())?;
    std::fs::create_dir_all(parent)
        .map_err(|error| format!("create managed room state directory: {error}"))?;
    #[cfg(unix)]
    {
        use std::os::unix::fs::PermissionsExt;
        std::fs::set_permissions(parent, std::fs::Permissions::from_mode(0o700))
            .map_err(|error| format!("protect managed room state directory: {error}"))?;
    }
    let temporary = parent.join(format!(
        ".{}.{}.tmp",
        path.file_name()
            .and_then(|name| name.to_str())
            .unwrap_or("state"),
        uuid::Uuid::new_v4().simple(),
    ));
    std::fs::write(&temporary, bytes)
        .map_err(|error| format!("write managed room state: {error}"))?;
    #[cfg(unix)]
    {
        use std::os::unix::fs::PermissionsExt;
        std::fs::set_permissions(&temporary, std::fs::Permissions::from_mode(0o600))
            .map_err(|error| format!("protect managed room state: {error}"))?;
    }
    std::fs::rename(&temporary, path)
        .map_err(|error| format!("replace managed room state: {error}"))?;
    Ok(())
}

#[cfg(feature = "managed-group-encryption")]
fn persist_managed_group_actions<R: Runtime>(
    app: &tauri::AppHandle<R>,
    state: &OpenRtcTauriState,
    capability_key: &str,
    device_id: &str,
    actions: Vec<serde_json::Value>,
) -> Result<Vec<serde_json::Value>, String> {
    let mut outbound = Vec::with_capacity(actions.len());
    for action in actions {
        if action.get("type").and_then(serde_json::Value::as_str) == Some("persist-state") {
            let sealed = action
                .get("sealedState")
                .and_then(serde_json::Value::as_str)
                .ok_or_else(|| "managed room persisted action is invalid".to_string())?;
            let bytes = base64::engine::general_purpose::URL_SAFE_NO_PAD
                .decode(sealed)
                .map_err(|_| "managed room persisted action encoding is invalid".to_string())?;
            write_private_managed_group_state(
                &managed_group_state_path(app, state, capability_key, device_id)?,
                &bytes,
            )?;
        } else {
            outbound.push(action);
        }
    }
    Ok(outbound)
}

#[cfg(feature = "managed-group-encryption")]
fn derive_tauri_managed_group_key(
    state: &OpenRtcTauriState,
    capability_key: &str,
    device_id: &str,
) -> Result<[u8; 32], String> {
    let client = state.client();
    let app_tag = client.app_tag();
    let challenge =
        format!("openrtc:managed-group-wrapping-key:v1:{app_tag}:{device_id}:{capability_key}",);
    let signer = state.native_device_key_signer.as_ref().ok_or_else(|| {
        "managed rooms require the host's sign-only native device key".to_string()
    })?;
    let mut signature = signer.sign(app_tag, challenge.as_bytes())?;
    if signature.len() != 64 {
        return Err("native device signer returned an invalid managed-room signature".to_string());
    }
    let mut digest = Sha256::new();
    digest.update(b"openrtc:managed-group-key-derivation:v1:");
    digest.update(challenge.as_bytes());
    digest.update(&signature);
    signature.fill(0);
    Ok(digest.finalize().into())
}

#[cfg(feature = "managed-group-encryption")]
#[tauri::command]
async fn openrtc_init_managed_room_group<R: Runtime>(
    app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
    capability_key: String,
    device_id: String,
) -> Result<serde_json::Value, String> {
    let capability_key = required_native_capability_part(capability_key, "capability key")?;
    let device_id = required_native_capability_part(device_id, "device id")?;
    {
        let registry = state.capability_registry.lock().await;
        let registration = registry
            .registrations
            .get(&capability_key)
            .ok_or_else(|| "managed room capability is not registered".to_string())?;
        if registration.avenue_kind != "room" {
            return Err("managed fanout is available only for room capabilities".to_string());
        }
    }
    let path = managed_group_state_path(&app, &state, &capability_key, &device_id)?;
    let sealed = match std::fs::read(path) {
        Ok(bytes) if bytes.len() <= 16 * 1024 * 1024 => Some(bytes),
        Ok(_) => return Err("managed room persisted state exceeds its protected bound".to_string()),
        Err(error) if error.kind() == std::io::ErrorKind::NotFound => None,
        Err(error) => return Err(format!("read managed room persisted state: {error}")),
    };
    let controller = openrtc::native::NativeManagedGroupController::new(
        &device_id,
        derive_tauri_managed_group_key(&state, &capability_key, &device_id)?,
        sealed.as_deref(),
    )
    .map_err(|error| format!("initialize managed room group: {error:#}"))?;
    let action = controller
        .publish_key_package()
        .map_err(|error| format!("create managed room KeyPackage: {error:#}"))?;
    state
        .managed_groups
        .lock()
        .await
        .insert(capability_key, controller);
    Ok(action)
}

#[cfg(feature = "managed-group-encryption")]
#[tauri::command]
async fn openrtc_handle_managed_room_prepare_page<R: Runtime>(
    app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
    capability_key: String,
    device_id: String,
    page: serde_json::Value,
) -> Result<Vec<serde_json::Value>, String> {
    let capability_key = required_native_capability_part(capability_key, "capability key")?;
    let device_id = required_native_capability_part(device_id, "device id")?;
    let actions = state
        .managed_groups
        .lock()
        .await
        .get_mut(&capability_key)
        .ok_or_else(|| "managed room group is not initialized".to_string())?
        .handle_prepare_page(page)
        .map_err(|error| format!("handle managed room preparation: {error:#}"))?;
    persist_managed_group_actions(&app, &state, &capability_key, &device_id, actions)
}

#[cfg(feature = "managed-group-encryption")]
#[tauri::command]
async fn openrtc_handle_managed_room_artifact_chunk<R: Runtime>(
    app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
    capability_key: String,
    device_id: String,
    chunk: serde_json::Value,
) -> Result<Vec<serde_json::Value>, String> {
    let capability_key = required_native_capability_part(capability_key, "capability key")?;
    let device_id = required_native_capability_part(device_id, "device id")?;
    let actions = state
        .managed_groups
        .lock()
        .await
        .get_mut(&capability_key)
        .ok_or_else(|| "managed room group is not initialized".to_string())?
        .handle_artifact_chunk(chunk)
        .map_err(|error| format!("handle managed room artifact: {error:#}"))?;
    persist_managed_group_actions(&app, &state, &capability_key, &device_id, actions)
}

#[cfg(feature = "managed-group-encryption")]
#[tauri::command]
#[allow(clippy::too_many_arguments)]
async fn openrtc_seal_managed_room_payload<R: Runtime>(
    app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
    capability_key: String,
    device_id: String,
    architecture_epoch: u64,
    encryption_epoch: u64,
    message_id: String,
    channel: String,
    priority: u8,
    zone_id: Option<String>,
    payload: Vec<u8>,
) -> Result<openrtc::native::NativeManagedProtectedPayload, String> {
    let capability_key = required_native_capability_part(capability_key, "capability key")?;
    let device_id = required_native_capability_part(device_id, "device id")?;
    let protected = state
        .managed_groups
        .lock()
        .await
        .get_mut(&capability_key)
        .ok_or_else(|| "managed room group is not initialized".to_string())?
        .seal_payload(
            architecture_epoch,
            encryption_epoch,
            &message_id,
            &channel,
            priority,
            zone_id.as_deref(),
            &payload,
        )
        .map_err(|error| format!("seal managed room payload: {error:#}"))?;
    let sealed = base64::engine::general_purpose::URL_SAFE_NO_PAD
        .decode(&protected.sealed_state)
        .map_err(|_| "managed room state encoding is invalid".to_string())?;
    write_private_managed_group_state(
        &managed_group_state_path(&app, &state, &capability_key, &device_id)?,
        &sealed,
    )?;
    Ok(protected)
}

#[cfg(feature = "managed-group-encryption")]
#[tauri::command]
#[allow(clippy::too_many_arguments)]
async fn openrtc_open_managed_room_payload<R: Runtime>(
    app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
    capability_key: String,
    device_id: String,
    architecture_epoch: u64,
    encryption_epoch: u64,
    message_id: String,
    channel: String,
    priority: u8,
    zone_id: Option<String>,
    ciphertext: Vec<u8>,
) -> Result<openrtc::native::NativeManagedProtectedPayload, String> {
    let capability_key = required_native_capability_part(capability_key, "capability key")?;
    let device_id = required_native_capability_part(device_id, "device id")?;
    let protected = state
        .managed_groups
        .lock()
        .await
        .get_mut(&capability_key)
        .ok_or_else(|| "managed room group is not initialized".to_string())?
        .open_payload(
            architecture_epoch,
            encryption_epoch,
            &message_id,
            &channel,
            priority,
            zone_id.as_deref(),
            &ciphertext,
        )
        .map_err(|error| format!("open managed room payload: {error:#}"))?;
    let sealed = base64::engine::general_purpose::URL_SAFE_NO_PAD
        .decode(&protected.sealed_state)
        .map_err(|_| "managed room state encoding is invalid".to_string())?;
    write_private_managed_group_state(
        &managed_group_state_path(&app, &state, &capability_key, &device_id)?,
        &sealed,
    )?;
    Ok(protected)
}

#[cfg(feature = "managed-group-encryption")]
#[tauri::command]
async fn openrtc_forget_managed_room_group(
    state: tauri::State<'_, OpenRtcTauriState>,
    capability_key: String,
) -> Result<(), String> {
    let capability_key = required_native_capability_part(capability_key, "capability key")?;
    state.managed_groups.lock().await.remove(&capability_key);
    Ok(())
}

#[cfg(not(feature = "managed-group-encryption"))]
macro_rules! unavailable_managed_room_command {
    ($name:ident ( $($arg:ident : $type:ty),* ) -> $return:ty) => {
        #[tauri::command]
        async fn $name($($arg: $type),*) -> Result<$return, String> {
            $(let _ = $arg;)*
            Err("native managed rooms were not compiled into this Tauri host".to_string())
        }
    };
}

#[cfg(not(feature = "managed-group-encryption"))]
unavailable_managed_room_command!(openrtc_init_managed_room_group(
    capability_key: String, device_id: String
) -> serde_json::Value);
#[cfg(not(feature = "managed-group-encryption"))]
unavailable_managed_room_command!(openrtc_handle_managed_room_prepare_page(
    capability_key: String, device_id: String, page: serde_json::Value
) -> Vec<serde_json::Value>);
#[cfg(not(feature = "managed-group-encryption"))]
unavailable_managed_room_command!(openrtc_handle_managed_room_artifact_chunk(
    capability_key: String, device_id: String, chunk: serde_json::Value
) -> Vec<serde_json::Value>);
#[cfg(not(feature = "managed-group-encryption"))]
unavailable_managed_room_command!(openrtc_seal_managed_room_payload(
    capability_key: String, device_id: String, architecture_epoch: u64,
    encryption_epoch: u64, message_id: String, channel: String, priority: u8,
    zone_id: Option<String>, payload: Vec<u8>
) -> serde_json::Value);
#[cfg(not(feature = "managed-group-encryption"))]
unavailable_managed_room_command!(openrtc_open_managed_room_payload(
    capability_key: String, device_id: String, architecture_epoch: u64,
    encryption_epoch: u64, message_id: String, channel: String, priority: u8,
    zone_id: Option<String>, ciphertext: Vec<u8>
) -> serde_json::Value);
#[cfg(not(feature = "managed-group-encryption"))]
unavailable_managed_room_command!(openrtc_forget_managed_room_group(
    capability_key: String
) -> ());

#[tauri::command]
async fn unregister_rtc_capability(
    state: tauri::State<'_, OpenRtcTauriState>,
    capability_key: String,
) -> Result<(), String> {
    let capability_key = required_native_capability_part(capability_key, "capability key")?;
    let (empty, aggregate) = {
        let mut registry = state.capability_registry.lock().await;
        registry.registrations.remove(&capability_key);
        let empty = registry.registrations.is_empty();
        let aggregate = (!empty)
            .then(|| registry.aggregate_desired_peers())
            .transpose()?;
        (empty, aggregate)
    };
    if empty {
        state.client().stop_external_auto_connect().await;
    } else if let Some((revision, peers_json)) = aggregate {
        state
            .client()
            .submit_external_desired_peers(revision, &peers_json)
            .await
            .map_err(|error| error.to_string())?;
    }
    Ok(())
}

#[tauri::command]
async fn start_rtc_managed_session<R: Runtime>(
    app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
    user_id: String,
    device_name: Option<String>,
    local_device_id: Option<String>,
    metadata: Option<String>,
    transports: Option<openrtc::client::TransportConfig>,
    auto_connect: Option<bool>,
    presence: Option<bool>,
) -> Result<StartSessionResult, String> {
    let command_started = std::time::Instant::now();
    let _start_guard = state.managed_session_start_guard.lock().await;
    let client = state.client();
    let app_tag = client.app_tag().to_string();
    eprintln!(
        "[openrtc-tauri][managed-session] start user_id={} app_tag={} has_device_name={} has_local_device_id={} has_metadata={} auto_connect={} presence={}",
        user_id,
        app_tag,
        device_name
            .as_deref()
            .map(str::trim)
            .map(|value| !value.is_empty())
            .unwrap_or(false),
        local_device_id
            .as_deref()
            .map(str::trim)
            .map(|value| !value.is_empty())
            .unwrap_or(false),
        metadata
            .as_deref()
            .map(str::trim)
            .map(|value| !value.is_empty())
            .unwrap_or(false),
        auto_connect.unwrap_or(false),
        presence.unwrap_or(false)
    );
    let data_dir = app_data_dir(&app, &state)?;
    let install_context = InstallContext {
        data_dir: data_dir.clone(),
    };
    ensure_requested_native_transports(&state, &client, transports.as_ref(), &install_context)
        .await?;
    if let Some(transport_config) = transports {
        client
            .update_transport_config(transport_config)
            .await
            .map_err(|error| error.to_string())?;
    }

    let local_node_id = ensure_iroh_node(client.clone()).await?;
    let local_device = client
        .init_native_device_identity(data_dir, device_name.as_deref())
        .await
        .map_err(|error| error.to_string())?;

    let effective_local_device_id =
        managed_session_device_id(local_device_id.as_deref(), &local_device);
    if let Some(requested) = requested_local_device_id(local_device_id.as_deref()) {
        if requested != local_device.device_id {
            eprintln!(
                "[openrtc-tauri] requested localDeviceId={} is an alias; persisted native identity {} remains authoritative",
                requested, local_device.device_id
            );
        }
    }

    let should_start_presence = presence.unwrap_or(false);
    let should_start_auto_connect = auto_connect.unwrap_or(false);
    if should_start_presence || should_start_auto_connect {
        return Err(
            "native Firebase coordination has been removed; publish gateway presence and submit external desired peers instead"
                .to_string(),
        );
    }
    // The native endpoint and durable device are root-owned. Capability
    // principals live in the registry above and must not replace this physical
    // lifecycle owner when devices, spaces, rooms, or tickets coexist.
    let managed_session_key = format!("{}:{}", app_tag, effective_local_device_id);
    let (disposition, reused) = {
        let active = state.managed_session.lock().await;
        let disposition = managed_session_disposition(
            active.as_ref().map(|record| record.key.as_str()),
            active
                .as_ref()
                .is_some_and(|record| Arc::ptr_eq(&record.owner_client, &client)),
            active
                .as_ref()
                .is_some_and(|record| record.result.presence_started),
            active
                .as_ref()
                .is_some_and(|record| record.result.auto_connect_started),
            &managed_session_key,
            should_start_presence,
            should_start_auto_connect,
        );
        let reused = (disposition == SessionDisposition::Reuse).then(|| {
            active
                .as_ref()
                .expect("managed session reuse requires an active record")
                .result
                .clone()
        });
        (disposition, reused)
    };
    if let Some(reused) = reused {
        eprintln!(
            "[openrtc-tauri][managed-session] reused key={} elapsed_ms={}",
            managed_session_key,
            command_started.elapsed().as_millis()
        );
        return Ok(reused);
    }

    // A different app/user/device tuple replaces the previous lifecycle owner.
    // Stop old background work before publishing the new authoritative lease.
    if disposition == SessionDisposition::Replace {
        let previous = state
            .managed_session
            .lock()
            .await
            .take()
            .expect("managed session replacement requires an active record");
        previous.owner_client.stop_presence_loop();
        previous.owner_client.stop_auto_connect();
        previous.owner_client.stop_external_auto_connect().await;
        *state.presence_loop_active.lock().await = false;
    }
    let ticket_scope = Some("user-device".to_string());
    let ticket = client
        .endpoint_ticket_with_token("user-device", 0)
        .await
        .map_err(|error| error.to_string())?;

    let logical_local_device = local_device.clone();

    let owner_epoch = match disposition {
        SessionDisposition::Refresh => {
            state
                .managed_session
                .lock()
                .await
                .as_ref()
                .expect("managed session refresh requires an active record")
                .owner_epoch
        }
        SessionDisposition::Start | SessionDisposition::Replace => {
            state.allocate_managed_session_owner_epoch()
        }
        SessionDisposition::Reuse => unreachable!("reuse returns before session startup"),
    };

    eprintln!(
        "[openrtc-tauri][managed-session] ready user_id={} app_tag={} local_node_id={} local_device_id={} owner_epoch={} presence_started={} auto_connect_started={} ticket_scope={} elapsed_ms={}",
        user_id,
        app_tag,
        local_node_id,
        logical_local_device.device_id,
        owner_epoch,
        should_start_presence,
        should_start_auto_connect,
        ticket_scope.as_deref().unwrap_or("unrestricted"),
        command_started.elapsed().as_millis()
    );

    let result = StartSessionResult {
        local_node_id,
        ticket_scope,
        ticket: Some(ticket),
        presence_started: false,
        auto_connect_started: false,
        local_device: logical_local_device,
    };
    *state.managed_session.lock().await = Some(ManagedSessionRecord {
        key: managed_session_key,
        owner_client: client,
        owner_epoch,
        result: result.clone(),
    });
    Ok(result)
}

#[tauri::command]
async fn start_rtc_external_auto_connect(
    state: tauri::State<'_, OpenRtcTauriState>,
    user_id: String,
    local_device_id: String,
    capability_key: Option<String>,
) -> Result<(), String> {
    if let Some(capability_key) = capability_key {
        let capability_key = required_native_capability_part(capability_key, "capability key")?;
        if !state
            .capability_registry
            .lock()
            .await
            .registrations
            .contains_key(&capability_key)
        {
            return Err(format!(
                "native capability {capability_key} is not registered"
            ));
        }
    }
    // The external desired-peer actor is one Rust root actor. Public avenue
    // principals are registration metadata, not lifecycle keys.
    let root_user_id = format!("{}:native-root", state.client().app_tag());
    let _requested_capability_principal = user_id;
    state
        .client()
        .start_external_auto_connect(root_user_id, local_device_id)
        .await
        .map_err(|error| error.to_string())
}

#[tauri::command]
async fn submit_rtc_desired_peers(
    state: tauri::State<'_, OpenRtcTauriState>,
    revision: u64,
    peers_json: String,
    capability_key: Option<String>,
    local_device_id: Option<String>,
    app_tag: Option<String>,
) -> Result<bool, String> {
    let original_peers = serde_json::from_str::<Vec<serde_json::Value>>(&peers_json)
        .map_err(|error| format!("invalid capability desired-peer payload: {error}"))?;
    if original_peers.len() > 100 {
        return Err("capability desired-peer payload exceeds 100 peers".to_string());
    }
    let key = {
        let registry = state.capability_registry.lock().await;
        match capability_key {
            Some(key) => required_native_capability_part(key, "capability key")?,
            None if registry.registrations.len() == 1 => registry
                .registrations
                .keys()
                .next()
                .cloned()
                .expect("one registration has one key"),
            None => {
                return Err(
                    "capabilityKey is required when multiple native capabilities are active"
                        .to_string(),
                )
            }
        }
    };
    let sparse = state
        .capability_registry
        .lock()
        .await
        .registrations
        .get(&key)
        .ok_or_else(|| format!("native capability {key} is not registered"))?
        .uses_sparse_fanout();
    let peers = if sparse {
        let local_device_id = local_device_id
            .as_deref()
            .map(str::trim)
            .filter(|value| !value.is_empty())
            .ok_or_else(|| "sparse native capability requires localDeviceId".to_string())?;
        let app_tag = app_tag
            .as_deref()
            .map(str::trim)
            .filter(|value| !value.is_empty())
            .ok_or_else(|| "sparse native capability requires appTag".to_string())?;
        let local_public_jwk = state.device_public_key(app_tag)?;
        let local_device_key_x = local_public_jwk
            .get("x")
            .and_then(serde_json::Value::as_str)
            .ok_or_else(|| "native sparse fanout signer returned no public key".to_string())?;
        let projected = state
            .client()
            .configure_sparse_fanout(
                &key,
                revision,
                local_device_id,
                local_device_key_x,
                &peers_json,
                true,
            )
            .await
            .map_err(|error| error.to_string())?
            .0;
        serde_json::from_str(&projected)
            .map_err(|error| format!("invalid projected desired-peer payload: {error}"))?
    } else {
        original_peers
    };
    let (root_revision, aggregate) = {
        let mut registry = state.capability_registry.lock().await;
        let registration = registry
            .registrations
            .get_mut(&key)
            .ok_or_else(|| format!("native capability {key} is not registered"))?;
        if revision <= registration.desired_revision {
            return Ok(false);
        }
        registration.desired_revision = revision;
        registration.desired_peers = peers;
        registry.aggregate_desired_peers()?
    };
    let accepted = state
        .client()
        .submit_external_desired_peers(root_revision, &aggregate)
        .await
        .map_err(|error| error.to_string())?;
    if accepted {
        // A capability can be registered after its peer is already connected.
        // Replay the Rust-owned read model after the desired-peer mapping is
        // committed instead of asking the frontend to redial or poll.
        replay_current_connection_states(&state).await;
    }
    Ok(accepted)
}

#[tauri::command]
async fn stop_rtc_auto_connect(state: tauri::State<'_, OpenRtcTauriState>) -> Result<(), String> {
    state.client().stop_auto_connect();
    state.client().stop_external_auto_connect().await;
    if let Some(active) = state.managed_session.lock().await.as_mut() {
        active.result.auto_connect_started = false;
    }
    Ok(())
}

#[tauri::command]
async fn connect_to_device(
    state: tauri::State<'_, OpenRtcTauriState>,
    device_id: Option<String>,
    endpoint_ticket: String,
    timeout_ms: Option<u64>,
) -> Result<openrtc::client::ManagedConnectResult, String> {
    let client = state.client();
    let connect = client.connect_device(device_id.as_deref(), &endpoint_ticket);
    match timeout_ms {
        Some(timeout_ms) => {
            tokio::time::timeout(std::time::Duration::from_millis(timeout_ms.max(1)), connect)
                .await
                .map_err(|_| format!("connect_to_device timeout after {timeout_ms}ms"))?
                .map_err(|error| error.to_string())
        }
        None => connect.await.map_err(|error| error.to_string()),
    }
}

#[tauri::command]
async fn disconnect_device(
    state: tauri::State<'_, OpenRtcTauriState>,
    device_id: String,
    node_id_hint: Option<String>,
) -> Result<(), String> {
    state
        .client()
        .disconnect_device(&device_id, node_id_hint.as_deref())
        .await;
    Ok(())
}

#[tauri::command]
async fn set_auto_connect_excluded(
    state: tauri::State<'_, OpenRtcTauriState>,
    device_id: String,
    excluded: bool,
) -> Result<(), String> {
    if excluded {
        state.client().exclude_peer_and_publish(&device_id).await;
    } else {
        state.client().unexclude_peer_and_publish(&device_id).await;
    }
    Ok(())
}

#[tauri::command]
async fn set_rtc_external_auto_connect_excluded(
    state: tauri::State<'_, OpenRtcTauriState>,
    device_id: String,
    excluded: bool,
) -> Result<(), String> {
    state
        .client()
        .set_auto_connect_excluded(&device_id, excluded);
    state.client().wake_native_external_auto_connect().await;
    Ok(())
}

#[tauri::command]
async fn resolve_rtc_peer_connection_records(
    state: tauri::State<'_, OpenRtcTauriState>,
    id: String,
) -> Result<Vec<openrtc::connection_manager::ConnectionRecord>, String> {
    Ok(state.client().resolve_peer_connection_records(&id).await)
}

#[tauri::command]
async fn resolve_rtc_peer_identity(
    state: tauri::State<'_, OpenRtcTauriState>,
    id: String,
) -> Result<Option<openrtc::connection_manager::PeerSnapshot>, String> {
    Ok(state.client().peer_snapshot(&id).await)
}

#[tauri::command]
async fn get_rtc_peer_session(
    state: tauri::State<'_, OpenRtcTauriState>,
    id: String,
) -> Result<Option<openrtc::client::PeerSessionSnapshot>, String> {
    Ok(state.client().peer_session(&id).await)
}

#[tauri::command]
async fn list_rtc_peer_sessions(
    state: tauri::State<'_, OpenRtcTauriState>,
) -> Result<Vec<openrtc::client::PeerSessionSnapshot>, String> {
    Ok(state.client().peer_sessions().await)
}

#[tauri::command]
async fn list_rtc_managed_connections(
    state: tauri::State<'_, OpenRtcTauriState>,
) -> Result<Vec<openrtc::connection_manager::ConnectionRecord>, String> {
    Ok(state.client().list_managed_connections().await)
}

#[derive(Debug, Clone, Serialize)]
#[serde(rename_all = "camelCase")]
struct NotifyRtcNetworkChangeResult {
    retired_stale_connections: usize,
}

#[tauri::command]
async fn notify_rtc_network_change(
    state: tauri::State<'_, OpenRtcTauriState>,
) -> Result<NotifyRtcNetworkChangeResult, String> {
    let retired_stale_connections = state
        .client()
        .notify_network_change()
        .await
        .map_err(|error| error.to_string())?;
    Ok(NotifyRtcNetworkChangeResult {
        retired_stale_connections,
    })
}

#[tauri::command]
async fn set_rtc_transport_priority(
    state: tauri::State<'_, OpenRtcTauriState>,
    priority: Vec<openrtc::route_policy::KnownRoute>,
) -> Result<(), String> {
    let client = state.client();
    let mut transport_config = client.transport_config().await;
    transport_config.route_priority = priority;
    client
        .update_transport_config(transport_config)
        .await
        .map_err(|error| error.to_string())
}

#[tauri::command]
async fn wait_for_rtc_settled_peer(
    state: tauri::State<'_, OpenRtcTauriState>,
    id: String,
    timeout_ms: Option<u64>,
) -> Result<Option<openrtc::client::PeerSessionSnapshot>, String> {
    Ok(state.client().wait_for_peer(&id, timeout_ms).await)
}

#[tauri::command]
async fn list_rtc_connection_states(
    state: tauri::State<'_, OpenRtcTauriState>,
    capability_key: String,
) -> Result<Vec<openrtc::client::StateSnapshot>, String> {
    let states = state.client().connection_states().await;
    let capability_key = required_native_capability_part(capability_key, "capability key")?;
    let registry = state.capability_registry.lock().await;
    Ok(states
        .into_iter()
        .filter(|snapshot| {
            registry
                .capability_keys_for_state(snapshot)
                .iter()
                .any(|key| key == &capability_key)
        })
        .collect())
}

#[tauri::command]
async fn get_rtc_connection_state(
    state: tauri::State<'_, OpenRtcTauriState>,
    connection_id: String,
    capability_key: String,
) -> Result<Option<openrtc::client::StateSnapshot>, String> {
    let snapshot = state.client().connection_state(&connection_id).await;
    let Some(snapshot) = snapshot else {
        return Ok(None);
    };
    let capability_key = required_native_capability_part(capability_key, "capability key")?;
    let included = state
        .capability_registry
        .lock()
        .await
        .capability_keys_for_state(&snapshot)
        .iter()
        .any(|key| key == &capability_key);
    Ok(included.then_some(snapshot))
}

#[tauri::command]
async fn stop_rtc_subscription(
    state: tauri::State<'_, OpenRtcTauriState>,
    request_id: String,
) -> Result<(), String> {
    stop_subscription_by_id(&state, &request_id).await;
    Ok(())
}

async fn stop_subscription_by_id(state: &OpenRtcTauriState, request_id: &str) {
    if let Some(handle) = state.subscriptions.lock().await.remove(request_id) {
        handle.abort();
    }
    let mut projected = state.native_projection_subscription.lock().await;
    if projected
        .as_ref()
        .is_some_and(|subscription| subscription.request_id == request_id)
    {
        *projected = None;
    }
}

/// Register the one capability-keyed WebView projection Channel.
///
/// Rust forwards canonical connection state, decrypted peer data, and streams
/// that the embedding host explicitly hands to `handoff_projected_peer_bi_stream`.
/// The Channel is projection only; it never attaches another Rust receiver or
/// owns peer lifecycle.
#[tauri::command]
async fn start_native_projection(
    state: tauri::State<'_, OpenRtcTauriState>,
    request_id: Option<String>,
    channel: Channel<NativeProjectionEvent>,
) -> Result<String, String> {
    let request_id = request_id
        .map(|value| value.trim().to_string())
        .filter(|value| !value.is_empty())
        .unwrap_or_else(|| uuid::Uuid::new_v4().to_string());
    let mut subscription = state.native_projection_subscription.lock().await;
    install_native_projection(&mut subscription, request_id, channel)
}

// The caller holds the existing projection-slot mutex across check and install.
fn install_native_projection(
    subscription: &mut Option<NativeProjectionSubscription>,
    request_id: String,
    channel: Channel<NativeProjectionEvent>,
) -> Result<String, String> {
    if let Some(current) = subscription.as_ref() {
        if current.request_id == request_id {
            // Same process owner reclaiming after Channel recreation (remount/HMR).
            *subscription = Some(NativeProjectionSubscription {
                request_id: request_id.clone(),
                channel,
            });
            return Ok(request_id);
        }
        // A different request is not proof of a stale owner. The current owner
        // must release its exact request before another Channel can claim it.
        return Err("OpenRTC native projection subscription already has a process owner".into());
    }
    *subscription = Some(NativeProjectionSubscription {
        request_id: request_id.clone(),
        channel,
    });
    Ok(request_id)
}

#[tauri::command]
async fn get_projected_stream_diagnostics(
    state: tauri::State<'_, OpenRtcTauriState>,
) -> Result<ProjectedStreamDiagnostics, String> {
    Ok(ProjectedStreamDiagnostics {
        subscription_active: state.native_projection_subscription.lock().await.is_some(),
        offered: state.projected_stream_offered.load(Ordering::Relaxed),
        decoded: state.projected_stream_decoded.load(Ordering::Relaxed),
        projected: state.projected_stream_projected.load(Ordering::Relaxed),
        unhandled_non_channel: state
            .projected_stream_unhandled_non_channel
            .load(Ordering::Relaxed),
        unhandled_other_channel: state
            .projected_stream_unhandled_other_channel
            .load(Ordering::Relaxed),
        unhandled_no_subscription: state
            .projected_stream_unhandled_no_subscription
            .load(Ordering::Relaxed),
        failures: state.projected_stream_failures.load(Ordering::Relaxed),
        last_transport_stable_id: state
            .projected_stream_last_transport_stable_id
            .load(Ordering::Relaxed),
        validation_checks: state
            .projected_stream_validation_checks
            .load(Ordering::Relaxed),
        validation_rejections: state
            .projected_stream_validation_rejections
            .load(Ordering::Relaxed),
        last_validated_transport_stable_id: state
            .projected_stream_last_validated_transport_stable_id
            .load(Ordering::Relaxed),
        authorized: state.projected_stream_authorized.load(Ordering::Relaxed),
        unauthorized: state.projected_stream_unauthorized.load(Ordering::Relaxed),
        last_channel: state.projected_stream_last_channel.lock().await.clone(),
        last_protocol: state.projected_stream_last_protocol.lock().await.clone(),
        last_connection_id: state
            .projected_stream_last_connection_id
            .lock()
            .await
            .clone(),
        last_remote_node_id: state
            .projected_stream_last_remote_node_id
            .lock()
            .await
            .clone(),
    })
}

#[tauri::command]
async fn is_current_transport_stable_id(
    state: tauri::State<'_, OpenRtcTauriState>,
    endpoint_id: String,
    transport_stable_id: u64,
) -> Result<bool, String> {
    state
        .projected_stream_validation_checks
        .fetch_add(1, Ordering::Relaxed);
    state
        .projected_stream_last_validated_transport_stable_id
        .store(transport_stable_id, Ordering::Relaxed);
    let is_current = state
        .client()
        .is_current_transport_stable_id_str(&endpoint_id, transport_stable_id)
        .await
        .map_err(|error| error.to_string())?;
    if !is_current {
        state
            .projected_stream_validation_rejections
            .fetch_add(1, Ordering::Relaxed);
    }
    if native_stream_trace_enabled() {
        eprintln!(
            "[openrtc-tauri][incoming-application-stream] remote_node_id={} transport_stable_id={} current={} phase=validate",
            endpoint_id, transport_stable_id, is_current
        );
    }
    Ok(is_current)
}

#[tauri::command]
async fn send_peer_message(
    state: tauri::State<'_, OpenRtcTauriState>,
    request: Request<'_>,
) -> Result<(), String> {
    let id = required_request_header(&request, PEER_ID_HEADER)?;
    let data = request_body_bytes(&request)?;
    state
        .client()
        .send_peer(&id, &data)
        .await
        .map_err(|error| error.to_string())
}

#[tauri::command]
async fn encode_sparse_fanout_message(
    state: tauri::State<'_, OpenRtcTauriState>,
    request: Request<'_>,
) -> Result<Response, String> {
    let capability = required_request_header(&request, FANOUT_CAPABILITY_HEADER)?;
    let app_tag = required_request_header(&request, FANOUT_APP_TAG_HEADER)?;
    let payload = request_body_bytes(&request)?;
    let signing_request = state
        .client()
        .prepare_sparse_fanout_message(&capability, &payload)
        .await
        .map_err(|error| error.to_string())?;
    let signature = state.sign_device_message(&app_tag, &signing_request.signing_input)?;
    state
        .client()
        .finalize_sparse_fanout_message(&signing_request.request_id, &signature)
        .await
        .map(Response::new)
        .map_err(|error| error.to_string())
}

#[tauri::command]
async fn accept_sparse_fanout_message(
    state: tauri::State<'_, OpenRtcTauriState>,
    request: Request<'_>,
) -> Result<serde_json::Value, String> {
    let capability = required_request_header(&request, FANOUT_CAPABILITY_HEADER)?;
    let source_peer = required_request_header(&request, FANOUT_SOURCE_PEER_HEADER)?;
    let encoded = request_body_bytes(&request)?;
    serde_json::to_value(
        state
            .client()
            .accept_sparse_fanout_message(&capability, &source_peer, &encoded)
            .await
            .map_err(|error| error.to_string())?,
    )
    .map_err(|error| error.to_string())
}

#[tauri::command]
async fn sparse_fanout_diagnostics(
    state: tauri::State<'_, OpenRtcTauriState>,
    capability_key: String,
) -> Result<openrtc::sparse_fanout::SparseFanoutDiagnostics, String> {
    Ok(state
        .client()
        .sparse_fanout_diagnostics(&required_native_capability_part(
            capability_key,
            "capability key",
        )?)
        .await)
}

#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
struct NativeBroadcastPublisherDescriptor {
    handle: String,
    verification_key: Vec<u8>,
}

#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
struct NativeBroadcastSessionDescriptor {
    handle_id: String,
    id: String,
    role: openrtc::broadcast::BroadcastRole,
    state: openrtc::broadcast::BroadcastState,
    budget: openrtc::broadcast::BroadcastBudget,
}

/// Creates a Rust-owned, sign-only publisher key. Only an opaque handle and
/// public verification key cross IPC; private bytes remain in this process.
#[tauri::command]
async fn prepare_openrtc_broadcast_publisher(
    state: tauri::State<'_, OpenRtcTauriState>,
) -> Result<NativeBroadcastPublisherDescriptor, String> {
    let signer = openrtc::broadcast::BroadcastPublisherSigner::generate()
        .map_err(|error| error.to_string())?;
    let verification_key = signer.verifying_key().to_vec();
    let handle = uuid::Uuid::new_v4().simple().to_string();
    state
        .broadcast_signers
        .lock()
        .await
        .insert(handle.clone(), signer);
    Ok(NativeBroadcastPublisherDescriptor {
        handle,
        verification_key,
    })
}

#[tauri::command]
async fn release_openrtc_broadcast_publisher(
    state: tauri::State<'_, OpenRtcTauriState>,
    handle: String,
) -> Result<bool, String> {
    Ok(state
        .broadcast_signers
        .lock()
        .await
        .remove(&handle)
        .is_some())
}

async fn drive_native_broadcast_actions(
    session: &openrtc::broadcast::BroadcastSession,
    adapter: &dyn NativeBroadcastAdapter,
) -> Result<(), String> {
    loop {
        let actions = session.take_actions(openrtc::broadcast::MAX_BROADCAST_ACTIONS);
        if actions.is_empty() {
            return Ok(());
        }
        for action in actions {
            if let Some(observation) = adapter.apply(session.clone(), action).await? {
                session
                    .observe(observation)
                    .map_err(|error| error.to_string())?;
            }
        }
    }
}

async fn native_broadcast_driver(
    state: &OpenRtcTauriState,
    handle_id: &str,
) -> Result<Arc<Mutex<()>>, String> {
    state
        .broadcast_drivers
        .lock()
        .await
        .get(handle_id)
        .cloned()
        .ok_or_else(|| "broadcast session is unavailable".to_string())
}

#[tauri::command]
async fn open_openrtc_broadcast(
    state: tauri::State<'_, OpenRtcTauriState>,
    grant_token: String,
    issuer_public_key: Vec<u8>,
    publisher_signer_handle: Option<String>,
    now_ms: u64,
) -> Result<NativeBroadcastSessionDescriptor, String> {
    let issuer_bytes: [u8; 32] = issuer_public_key
        .try_into()
        .map_err(|_| "broadcast issuer key must be 32 bytes".to_string())?;
    let issuer = VerifyingKey::from_bytes(&issuer_bytes)
        .map_err(|_| "broadcast issuer key is invalid".to_string())?;
    #[cfg(feature = "native-broadcast-moq")]
    let publication_verifying_key = if let Some(handle) = publisher_signer_handle.as_deref() {
        Some(
            state
                .broadcast_signers
                .lock()
                .await
                .get(handle)
                .ok_or_else(|| "broadcast publisher signer handle is invalid".to_string())?
                .verifying_key(),
        )
    } else {
        None
    };
    let broadcasts = state.client().broadcasts();
    let challenge = broadcasts
        .prepare_grant_verification(&grant_token, &issuer, now_ms)
        .map_err(|error| error.to_string())?;
    let device_signer = state.native_device_key_signer.as_deref().ok_or_else(|| {
        "native managed broadcast requires the host device-key signer".to_string()
    })?;
    let binding_signature = device_signer
        .sign(state.client().app_tag(), &challenge.signing_bytes)
        .map_err(|error| format!("sign broadcast installation challenge: {error}"))?;
    let grant = broadcasts
        .complete_grant_verification(
            &grant_token,
            &issuer,
            &challenge.handle,
            &binding_signature,
            now_ms,
        )
        .map_err(|error| error.to_string())?;
    let grant_generation = grant.grant_generation();
    #[cfg(feature = "native-broadcast-moq")]
    let native_moq_access = if state.native_broadcast_moq_adapter.is_some() {
        Some(
            state
                .resolve_native_broadcast_access(
                    &grant_token,
                    publication_verifying_key.as_ref(),
                    &issuer_bytes,
                )
                .await?,
        )
    } else {
        None
    };
    let session = if let Some(handle) = publisher_signer_handle.as_deref() {
        let signers = state.broadcast_signers.lock().await;
        let signer = signers
            .get(handle)
            .ok_or_else(|| "broadcast publisher signer handle is invalid".to_string())?;
        state
            .client()
            .broadcasts()
            .open_publisher(grant, signer, now_ms)
    } else {
        state.client().broadcasts().open(grant, now_ms)
    }
    .map_err(|error| error.to_string())?;
    let handle_id = format!("{}:{grant_generation}", session.id());
    #[cfg(feature = "native-broadcast-moq")]
    if let (Some(adapter), Some(access)) = (
        state.native_broadcast_moq_adapter.as_ref(),
        native_moq_access,
    ) {
        adapter
            .authorize(session.id(), grant_generation, access)
            .await;
    }
    let adapter = state.native_broadcast_adapter.as_deref().ok_or_else(|| {
        session.close();
        "native managed broadcast adapter is unavailable".to_string()
    })?;
    if let Err(error) = drive_native_broadcast_actions(&session, adapter).await {
        session.close();
        #[cfg(feature = "native-broadcast-moq")]
        if let Some(adapter) = state.native_broadcast_moq_adapter.as_ref() {
            adapter
                .forget_authorization(&session.id(), grant_generation)
                .await;
        }
        return Err(error);
    }
    let descriptor = NativeBroadcastSessionDescriptor {
        handle_id: handle_id.clone(),
        id: session.id(),
        role: session.role(),
        state: session.state(),
        budget: session.budget(),
    };
    state
        .broadcast_sessions
        .lock()
        .await
        .insert(handle_id.clone(), session);
    state
        .broadcast_drivers
        .lock()
        .await
        .insert(handle_id, Arc::new(Mutex::new(())));
    Ok(descriptor)
}

#[tauri::command]
#[allow(clippy::too_many_arguments)]
async fn begin_openrtc_broadcast_publication(
    state: tauri::State<'_, OpenRtcTauriState>,
    handle_id: String,
    source_slot: String,
    publication_id: Option<String>,
    kind: String,
    codec: String,
    clock_rate: u32,
    coded_width: Option<u32>,
    coded_height: Option<u32>,
    channels: Option<u16>,
) -> Result<PortableMediaPublicationStart, String> {
    let driver = native_broadcast_driver(&state, &handle_id).await?;
    let _driver = driver.lock().await;
    let publication_id = match publication_id.as_deref().map(str::trim) {
        Some(value) if !value.is_empty() => parse_media_publication_id(value)?,
        _ => openrtc::media::PublicationId::from_bytes(*uuid::Uuid::new_v4().as_bytes()),
    };
    let kind: openrtc::media::MediaKind = kind
        .parse()
        .map_err(|error: openrtc::media::MediaProtocolError| error.to_string())?;
    if !matches!(
        kind,
        openrtc::media::MediaKind::Audio | openrtc::media::MediaKind::Video
    ) {
        return Err("broadcast publications must be audio or video".to_string());
    }
    let publication = openrtc::media::MediaPublicationConfig {
        publication_id,
        media_generation: 0,
        kind,
        codec: codec
            .parse()
            .map_err(|error: openrtc::media::MediaProtocolError| error.to_string())?,
        clock_rate,
        coded_width,
        coded_height,
        channels,
    };
    let session = state
        .broadcast_sessions
        .lock()
        .await
        .get(&handle_id)
        .cloned()
        .ok_or_else(|| "broadcast session is unavailable".to_string())?;
    let publication = session
        .begin_publication(&source_slot, publication)
        .map_err(|error| error.to_string())?;
    let adapter = state
        .native_broadcast_adapter
        .as_deref()
        .ok_or_else(|| "native managed broadcast adapter is unavailable".to_string())?;
    drive_native_broadcast_actions(&session, adapter).await?;
    Ok(PortableMediaPublicationStart {
        publication_id: publication.publication_id.to_string(),
        media_generation: publication.media_generation,
        // Broadcast control is signed and goes only to the private adapter.
        control: Vec::new(),
    })
}

#[tauri::command]
#[allow(clippy::too_many_arguments)]
async fn publish_openrtc_broadcast_sample(
    state: tauri::State<'_, OpenRtcTauriState>,
    handle_id: String,
    publication_id: String,
    timestamp_us: u64,
    duration_us: u32,
    keyframe: bool,
    discardable: bool,
    payload: Vec<u8>,
) -> Result<(), String> {
    let driver = native_broadcast_driver(&state, &handle_id).await?;
    let _driver = driver.lock().await;
    openrtc::media::ensure_javascript_safe_integer(timestamp_us, "timestamp")
        .map_err(|error| error.to_string())?;
    let session = state
        .broadcast_sessions
        .lock()
        .await
        .get(&handle_id)
        .cloned()
        .ok_or_else(|| "broadcast session is unavailable".to_string())?;
    session
        .publish(
            parse_media_publication_id(&publication_id)?,
            openrtc::media::EncodedMediaSample {
                timestamp_us,
                duration_us,
                keyframe,
                discardable,
                payload,
            },
        )
        .map_err(|error| error.to_string())?;
    let adapter = state
        .native_broadcast_adapter
        .as_deref()
        .ok_or_else(|| "native managed broadcast adapter is unavailable".to_string())?;
    drive_native_broadcast_actions(&session, adapter).await
}

#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
struct NativeBroadcastMediaSample {
    publication_id: String,
    media_generation: u32,
    sequence: u64,
    timestamp_us: u64,
    duration_us: u32,
    kind: &'static str,
    codec: &'static str,
    keyframe: bool,
    discardable: bool,
    payload: Vec<u8>,
}

struct NativeBroadcastReceivedObject {
    source_slot: Option<String>,
    object: Vec<u8>,
}

/// Retrieves only media objects already accepted by the private native
/// adapter and verified/decoded by the shared Rust broadcast owner. Provider
/// credentials, namespaces, and raw adapter actions never cross IPC.
#[tauri::command]
async fn receive_openrtc_broadcast_media(
    state: tauri::State<'_, OpenRtcTauriState>,
    handle_id: String,
    max: usize,
) -> Result<Vec<NativeBroadcastMediaSample>, String> {
    let driver = native_broadcast_driver(&state, &handle_id).await?;
    let _driver = driver.lock().await;
    let session = state
        .broadcast_sessions
        .lock()
        .await
        .get(&handle_id)
        .cloned()
        .ok_or_else(|| "broadcast session is unavailable".to_string())?;
    let adapter = state
        .native_broadcast_adapter
        .as_deref()
        .ok_or_else(|| "native managed broadcast adapter is unavailable".to_string())?;
    drive_native_broadcast_actions(&session, adapter).await?;
    let objects: Vec<NativeBroadcastReceivedObject>;
    #[cfg(feature = "native-broadcast-moq")]
    {
        objects = if let Some(native_moq) = state.native_broadcast_moq_adapter.as_ref() {
            native_moq
                .take_inbound_objects_with_source(&session, max.min(64))
                .await?
                .into_iter()
                .map(|item| NativeBroadcastReceivedObject {
                    source_slot: Some(item.source_slot),
                    object: item.object,
                })
                .collect()
        } else {
            adapter
                .take_inbound_objects(session.clone(), max.min(64))
                .await?
                .into_iter()
                .map(|object| NativeBroadcastReceivedObject {
                    source_slot: None,
                    object,
                })
                .collect()
        };
    }
    #[cfg(not(feature = "native-broadcast-moq"))]
    {
        objects = adapter
            .take_inbound_objects(session.clone(), max.min(64))
            .await?
            .into_iter()
            .map(|object| NativeBroadcastReceivedObject {
                source_slot: None,
                object,
            })
            .collect();
    }
    let mut accepted = Vec::with_capacity(objects.len());
    let mut delivered_bytes = 0_u64;
    for received in objects {
        let object_len = received.object.len() as u64;
        let chunk = if let Some(source_slot) = received.source_slot.as_deref() {
            let Some(media) = session
                .accept_media_for_source(source_slot, &received.object)
                .map_err(|error| error.to_string())?
            else {
                continue;
            };
            delivered_bytes = delivered_bytes.saturating_add(object_len);
            match media.media {
                Some(media) => Some(
                    openrtc::media::EncodedMediaChunk::decode(&media)
                        .map_err(|error| error.to_string())?,
                ),
                None => None,
            }
        } else {
            let chunk = session
                .accept_object(&received.object)
                .map_err(|error| error.to_string())?;
            delivered_bytes = delivered_bytes.saturating_add(object_len);
            chunk
        };
        let Some(chunk) = chunk else { continue };
        openrtc::media::ensure_javascript_safe_integer(chunk.sequence, "sequence")
            .and_then(|_| {
                openrtc::media::ensure_javascript_safe_integer(chunk.timestamp_us, "timestamp")
            })
            .map_err(|error| error.to_string())?;
        accepted.push(NativeBroadcastMediaSample {
            publication_id: chunk.publication_id.to_string(),
            media_generation: chunk.media_generation,
            sequence: chunk.sequence,
            timestamp_us: chunk.timestamp_us,
            duration_us: chunk.duration_us,
            kind: media_kind_name(chunk.kind),
            codec: media_codec_name(chunk.codec),
            keyframe: chunk.keyframe,
            discardable: chunk.discardable,
            payload: chunk.payload,
        });
    }
    #[cfg(feature = "native-broadcast-moq")]
    if let Some(native_moq) = state.native_broadcast_moq_adapter.as_ref() {
        let usage = native_moq
            .record_delivered_bytes(&session, delivered_bytes)
            .await;
        let settlement = drive_native_broadcast_actions(&session, adapter).await;
        usage?;
        settlement?;
    }
    Ok(accepted)
}

#[tauri::command]
async fn revoke_openrtc_broadcast(
    state: tauri::State<'_, OpenRtcTauriState>,
    handle_id: String,
    grant_generation: u64,
) -> Result<(), String> {
    let driver = native_broadcast_driver(&state, &handle_id).await?;
    let _driver = driver.lock().await;
    let session = state
        .broadcast_sessions
        .lock()
        .await
        .get(&handle_id)
        .cloned()
        .ok_or_else(|| "broadcast session is unavailable".to_string())?;
    session
        .revoke(grant_generation)
        .map_err(|error| error.to_string())?;
    let adapter = state
        .native_broadcast_adapter
        .as_deref()
        .ok_or_else(|| "native managed broadcast adapter is unavailable".to_string())?;
    drive_native_broadcast_actions(&session, adapter).await
}

#[tauri::command]
async fn close_openrtc_broadcast(
    state: tauri::State<'_, OpenRtcTauriState>,
    handle_id: String,
) -> Result<(), String> {
    let driver = native_broadcast_driver(&state, &handle_id).await?;
    let _driver = driver.lock().await;
    let session = state
        .broadcast_sessions
        .lock()
        .await
        .remove(&handle_id)
        .ok_or_else(|| "broadcast session is unavailable".to_string())?;
    session.close();
    let adapter = state
        .native_broadcast_adapter
        .as_deref()
        .ok_or_else(|| "native managed broadcast adapter is unavailable".to_string())?;
    let result = drive_native_broadcast_actions(&session, adapter).await;
    state.broadcast_drivers.lock().await.remove(&handle_id);
    result
}

#[tauri::command]
async fn record_sparse_fanout_forward_queue_drop(
    state: tauri::State<'_, OpenRtcTauriState>,
    capability_key: String,
    count: u64,
) -> Result<(), String> {
    state
        .client()
        .record_sparse_fanout_forward_queue_drop(
            &required_native_capability_part(capability_key, "capability key")?,
            count,
        )
        .await
        .map_err(|error| error.to_string())
}

#[tauri::command]
async fn is_peer_connected(
    state: tauri::State<'_, OpenRtcTauriState>,
    node_id: String,
) -> Result<bool, String> {
    state
        .client()
        .is_connected_str(&node_id)
        .await
        .map_err(|error| error.to_string())
}

#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
struct PortableMediaPublicationStart {
    publication_id: String,
    media_generation: u32,
    control: Vec<u8>,
}

fn media_kind_name(kind: openrtc::media::MediaKind) -> &'static str {
    match kind {
        openrtc::media::MediaKind::Audio => "audio",
        openrtc::media::MediaKind::Video => "video",
        openrtc::media::MediaKind::Screen => "screen",
        openrtc::media::MediaKind::Data => "data",
    }
}

fn media_codec_name(codec: openrtc::media::MediaCodec) -> &'static str {
    match codec {
        openrtc::media::MediaCodec::Opus => "opus",
        openrtc::media::MediaCodec::H264 => "h264",
        openrtc::media::MediaCodec::Vp8 => "vp8",
        openrtc::media::MediaCodec::Vp9 => "vp9",
        openrtc::media::MediaCodec::Av1 => "av1",
        openrtc::media::MediaCodec::Pcm => "pcm",
        openrtc::media::MediaCodec::Opaque => "opaque",
    }
}

fn parse_media_publication_id(value: &str) -> Result<openrtc::media::PublicationId, String> {
    value
        .trim()
        .parse()
        .map_err(|error: openrtc::media::MediaProtocolError| error.to_string())
}

#[tauri::command]
#[allow(clippy::too_many_arguments)]
async fn begin_openrtc_media_publication(
    state: tauri::State<'_, OpenRtcTauriState>,
    publication_id: Option<String>,
    kind: String,
    codec: String,
    clock_rate: u32,
    coded_width: Option<u32>,
    coded_height: Option<u32>,
    channels: Option<u16>,
) -> Result<PortableMediaPublicationStart, String> {
    let publication_id = match publication_id.as_deref().map(str::trim) {
        Some(value) if !value.is_empty() => parse_media_publication_id(value)?,
        _ => openrtc::media::PublicationId::from_bytes(*uuid::Uuid::new_v4().as_bytes()),
    };
    let kind: openrtc::media::MediaKind = kind
        .parse()
        .map_err(|error: openrtc::media::MediaProtocolError| error.to_string())?;
    if !matches!(
        kind,
        openrtc::media::MediaKind::Audio | openrtc::media::MediaKind::Video
    ) {
        return Err("browser media publications must be audio or video".to_string());
    }
    let codec = codec
        .parse()
        .map_err(|error: openrtc::media::MediaProtocolError| error.to_string())?;
    let publication = openrtc::media::MediaPublicationConfig {
        publication_id,
        media_generation: 0,
        kind,
        codec,
        clock_rate,
        coded_width,
        coded_height,
        channels,
    };
    let (publication, control) = state
        .portable_media
        .lock()
        .await
        .begin_publication(publication)
        .map_err(|error| error.to_string())?;
    Ok(PortableMediaPublicationStart {
        publication_id: publication.publication_id.to_string(),
        media_generation: publication.media_generation,
        control,
    })
}

#[tauri::command]
#[allow(clippy::too_many_arguments)]
async fn encode_openrtc_media_sample(
    state: tauri::State<'_, OpenRtcTauriState>,
    request: Request<'_>,
) -> Result<Response, String> {
    let publication_id = required_request_header(&request, MEDIA_PUBLICATION_ID_HEADER)?;
    let timestamp_us = parsed_request_header(&request, MEDIA_TIMESTAMP_US_HEADER)?;
    openrtc::media::ensure_javascript_safe_integer(timestamp_us, "timestamp")
        .map_err(|error| error.to_string())?;
    let duration_us = parsed_request_header(&request, MEDIA_DURATION_US_HEADER)?;
    let keyframe = parsed_request_header(&request, MEDIA_KEYFRAME_HEADER)?;
    let discardable = parsed_request_header(&request, MEDIA_DISCARDABLE_HEADER)?;
    let payload = request_body_bytes(&request)?;
    let encoded = state
        .portable_media
        .lock()
        .await
        .encode_sample(
            parse_media_publication_id(&publication_id)?,
            openrtc::media::EncodedMediaSample {
                timestamp_us,
                duration_us,
                keyframe,
                discardable,
                payload,
            },
        )
        .map_err(|error| error.to_string())?;
    Ok(Response::new(encoded))
}

#[tauri::command]
async fn pause_openrtc_media_publication(
    state: tauri::State<'_, OpenRtcTauriState>,
    publication_id: String,
) -> Result<(), String> {
    state
        .portable_media
        .lock()
        .await
        .pause_publication(parse_media_publication_id(&publication_id)?)
        .map_err(|error| error.to_string())
}

#[tauri::command]
async fn retire_openrtc_media_publication(
    state: tauri::State<'_, OpenRtcTauriState>,
    publication_id: String,
) -> Result<(), String> {
    state
        .portable_media
        .lock()
        .await
        .retire_publication(parse_media_publication_id(&publication_id)?);
    Ok(())
}

#[tauri::command]
async fn retire_openrtc_media_receiver(
    state: tauri::State<'_, OpenRtcTauriState>,
    publication_id: String,
    media_generation: u32,
) -> Result<(), String> {
    state.portable_media.lock().await.retire_receiver(
        parse_media_publication_id(&publication_id)?,
        media_generation,
    );
    Ok(())
}

#[tauri::command]
async fn decode_openrtc_media_chunk(
    state: tauri::State<'_, OpenRtcTauriState>,
    request: Request<'_>,
) -> Result<Response, String> {
    let encoded = request_body_bytes(&request)?;
    let chunk = state
        .portable_media
        .lock()
        .await
        .decode_chunk(&encoded)
        .map_err(|error| error.to_string())?;
    openrtc::media::ensure_javascript_safe_integer(chunk.sequence, "sequence")
        .and_then(|_| {
            openrtc::media::ensure_javascript_safe_integer(chunk.timestamp_us, "timestamp")
        })
        .map_err(|error| error.to_string())?;
    let metadata = serde_json::to_vec(&serde_json::json!({
        "publicationId": chunk.publication_id.to_string(),
        "mediaGeneration": chunk.media_generation,
        "sequence": chunk.sequence,
        "timestampUs": chunk.timestamp_us,
        "durationUs": chunk.duration_us,
        "kind": media_kind_name(chunk.kind),
        "codec": media_codec_name(chunk.codec),
        "keyframe": chunk.keyframe,
        "discardable": chunk.discardable,
    }))
    .map_err(|error| format!("encode media IPC metadata failed: {error}"))?;
    let metadata_len =
        u32::try_from(metadata.len()).map_err(|_| "media IPC metadata is too large".to_string())?;
    let mut response = Vec::with_capacity(4 + metadata.len() + chunk.payload.len());
    response.extend_from_slice(&metadata_len.to_be_bytes());
    response.extend_from_slice(&metadata);
    response.extend_from_slice(&chunk.payload);
    Ok(Response::new(response))
}

#[tauri::command]
async fn decode_openrtc_media_control(
    state: tauri::State<'_, OpenRtcTauriState>,
    request: Request<'_>,
) -> Result<serde_json::Value, String> {
    let encoded = request_body_bytes(&request)?;
    let control = state
        .portable_media
        .lock()
        .await
        .decode_control(&encoded)
        .map_err(|error| error.to_string())?;
    Ok(match control {
        openrtc::media::MediaControlFrame::Publish {
            publication_id,
            media_generation,
            kind,
            codec,
            clock_rate,
            coded_width,
            coded_height,
            channels,
        } => serde_json::json!({
            "type": "publish",
            "publicationId": publication_id.to_string(),
            "mediaGeneration": media_generation,
            "kind": media_kind_name(kind),
            "codec": media_codec_name(codec),
            "clockRate": clock_rate,
            "codedWidth": coded_width,
            "codedHeight": coded_height,
            "channels": channels,
        }),
        openrtc::media::MediaControlFrame::SetEnabled {
            publication_id,
            media_generation,
            enabled,
        } => serde_json::json!({
            "type": "set-enabled",
            "publicationId": publication_id.to_string(),
            "mediaGeneration": media_generation,
            "enabled": enabled,
        }),
        openrtc::media::MediaControlFrame::RequestKeyframe {
            publication_id,
            media_generation,
        } => serde_json::json!({
            "type": "request-keyframe",
            "publicationId": publication_id.to_string(),
            "mediaGeneration": media_generation,
        }),
        openrtc::media::MediaControlFrame::Stop {
            publication_id,
            media_generation,
            reason,
        } => serde_json::json!({
            "type": "stop",
            "publicationId": publication_id.to_string(),
            "mediaGeneration": media_generation,
            "reason": reason,
        }),
    })
}

#[tauri::command]
async fn open_peer_bi_stream<R: Runtime>(
    app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
    peer_id: String,
    timeout_ms: Option<u64>,
) -> Result<OpenBiResult, String> {
    open_peer_bi_with(app, state, peer_id, timeout_ms, |client, peer_id, timeout_ms| async move {
        client.open_peer_bi(&peer_id, timeout_ms).await
    })
    .await
}

#[tauri::command]
async fn open_peer_bi_transport_only_stream<R: Runtime>(
    app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
    peer_id: String,
    timeout_ms: Option<u64>,
) -> Result<OpenBiResult, String> {
    open_peer_bi_with(
        app,
        state,
        peer_id,
        timeout_ms,
        |client, peer_id, timeout_ms| async move {
            client
                .open_peer_bi_transport_only(&peer_id, timeout_ms)
                .await
                .map(|(connection_id, remote_node_id, send, recv)| {
                    (
                        connection_id,
                        remote_node_id,
                        PeerSendStream::plain(send),
                        PeerRecvStream::plain(recv),
                    )
                })
        },
    )
    .await
}

#[tauri::command]
async fn open_peer_uni_stream(
    state: tauri::State<'_, OpenRtcTauriState>,
    peer_id: String,
    timeout_ms: Option<u64>,
) -> Result<OpenUniResult, String> {
    let peer_id = peer_id.trim().to_string();
    if peer_id.is_empty() {
        return Err("peerId is required".to_string());
    }
    let (connection_id, remote_node_id, send) = state
        .client()
        .open_peer_uni(&peer_id, timeout_ms)
        .await
        .map_err(|error| format!("open peer uni stream failed: {error}"))?;
    let stream_id = uuid::Uuid::new_v4().to_string();
    state
        .peer_uni_streams
        .lock()
        .await
        .insert(stream_id.clone(), Arc::new(Mutex::new(Some(send))));
    Ok(OpenUniResult {
        stream_id,
        connection_id,
        remote_node_id,
    })
}

#[tauri::command]
async fn write_peer_bi_stream(
    state: tauri::State<'_, OpenRtcTauriState>,
    request: Request<'_>,
) -> Result<(), String> {
    let stream_id = required_request_header(&request, PEER_BI_STREAM_ID_HEADER)?;
    let bytes = request_body_bytes(&request)?;

    let send = {
        let streams = state.peer_bi_streams.lock().await;
        streams
            .get(&stream_id)
            .map(|handle| handle.send.clone())
            .ok_or_else(|| format!("peer bi stream not found: {stream_id}"))?
    };
    let result = send
        .lock()
        .await
        .as_mut()
        .ok_or_else(|| format!("peer bi stream already closed: {stream_id}"))?
        .write_all(&bytes)
        .await
        .map_err(|error| format!("write peer bi stream failed: {error}"));
    result
}

#[tauri::command]
async fn start_peer_bi_stream_read<R: Runtime>(
    _app: tauri::AppHandle<R>,
    state: tauri::State<'_, OpenRtcTauriState>,
    stream_id: String,
    channel: Channel<Response>,
) -> Result<(), String> {
    let stream_id = stream_id.trim().to_string();
    if stream_id.is_empty() {
        return Err("streamId is required".to_string());
    }

    let mut streams = state.peer_bi_streams.lock().await;
    let handle = streams
        .get_mut(&stream_id)
        .ok_or_else(|| format!("peer bi stream not found: {stream_id}"))?;
    if handle.read_task.is_some() {
        return Ok(());
    }
    let recv = handle
        .recv
        .take()
        .ok_or_else(|| format!("peer bi stream reader already consumed: {stream_id}"))?;
    handle.read_task = Some(spawn_peer_bi_stream_reader(channel, stream_id, recv));
    Ok(())
}

/// Cancel only the receive half of a bidirectional stream.
///
/// Web Streams permits a consumer to cancel an unused readable while keeping
/// its writable alive. Media publications rely on that half-close behavior, so
/// the native IPC projection must not remove or finish the Rust send handle.
#[tauri::command]
async fn cancel_peer_bi_stream_read(
    state: tauri::State<'_, OpenRtcTauriState>,
    stream_id: String,
) -> Result<(), String> {
    let stream_id = stream_id.trim().to_string();
    if stream_id.is_empty() {
        return Err("streamId is required".to_string());
    }

    let mut streams = state.peer_bi_streams.lock().await;
    let handle = streams
        .get_mut(&stream_id)
        .ok_or_else(|| format!("peer bi stream not found: {stream_id}"))?;
    handle.recv.take();
    if let Some(read_task) = handle.read_task.take() {
        read_task.abort();
    }
    Ok(())
}

#[tauri::command]
async fn close_peer_bi_stream(
    state: tauri::State<'_, OpenRtcTauriState>,
    stream_id: String,
) -> Result<(), String> {
    let stream_id = stream_id.trim().to_string();
    if stream_id.is_empty() {
        return Err("streamId is required".to_string());
    }

    let handle = {
        let mut streams = state.peer_bi_streams.lock().await;
        streams.remove(&stream_id)
    };
    if let Some(handle) = handle {
        // Hold the writer mutex before finishing so close waits for any
        // in-flight chunk write instead of skipping the flush when Arc clones exist.
        let mut send = handle.send.lock().await;
        if let Some(send) = send.take() {
            let _ = send.finish();
        }
        drop(send);
        if let Some(read_task) = handle.read_task {
            read_task.abort();
        }
    }
    Ok(())
}

#[tauri::command]
async fn write_peer_uni_stream(
    state: tauri::State<'_, OpenRtcTauriState>,
    request: Request<'_>,
) -> Result<(), String> {
    let stream_id = required_request_header(&request, PEER_BI_STREAM_ID_HEADER)?;
    let bytes = request_body_bytes(&request)?;
    let send = {
        let streams = state.peer_uni_streams.lock().await;
        streams
            .get(&stream_id)
            .cloned()
            .ok_or_else(|| format!("peer uni stream not found: {stream_id}"))?
    };
    let result = send
        .lock()
        .await
        .as_mut()
        .ok_or_else(|| format!("peer uni stream already closed: {stream_id}"))?
        .write_all(&bytes)
        .await
        .map_err(|error| format!("write peer uni stream failed: {error}"));
    result
}

#[tauri::command]
async fn close_peer_uni_stream(
    state: tauri::State<'_, OpenRtcTauriState>,
    stream_id: String,
) -> Result<(), String> {
    let stream_id = stream_id.trim().to_string();
    if stream_id.is_empty() {
        return Err("streamId is required".to_string());
    }
    let send = state.peer_uni_streams.lock().await.remove(&stream_id);
    if let Some(send) = send {
        if let Some(send) = send.lock().await.take() {
            let _ = send.finish();
        }
    }
    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::collections::HashMap as StdHashMap;
    use std::sync::atomic::{AtomicUsize, Ordering};
    use std::sync::Mutex as StdMutex;
    use tokio::sync::oneshot;

    #[test]
    fn native_projection_rejects_competing_owner_without_replacing_channel() {
        let mut slot = None;
        let first = Channel::new(|_| Ok(()));
        let first_id = first.id();
        install_native_projection(&mut slot, "first".into(), first).unwrap();
        let error = install_native_projection(
            &mut slot, "second".into(), Channel::new(|_| Ok(())),
        ).unwrap_err();
        assert!(error.contains("already has a process owner"));
        assert_eq!(slot.as_ref().unwrap().request_id, "first");
        assert_eq!(slot.as_ref().unwrap().channel.id(), first_id);

        let refreshed = Channel::new(|_| Ok(()));
        let refreshed_id = refreshed.id();
        install_native_projection(&mut slot, "first".into(), refreshed).unwrap();
        assert_eq!(slot.as_ref().unwrap().channel.id(), refreshed_id);
        slot = None;
        install_native_projection(&mut slot, "second".into(), Channel::new(|_| Ok(()))).unwrap();
        assert_eq!(slot.as_ref().unwrap().request_id, "second");
        assert!(install_native_projection(
            &mut slot, "first".into(), Channel::new(|_| Ok(())),
        ).is_err());
        assert_eq!(slot.as_ref().unwrap().request_id, "second");
    }

    struct FakeTransportInstaller {
        installs: Arc<AtomicUsize>,
    }

    #[derive(Default)]
    struct FakeDeviceKeySigner {
        records: StdMutex<StdHashMap<String, String>>,
    }

    impl DeviceKeySigner for FakeDeviceKeySigner {
        fn public_jwk(&self, _app_tag: &str) -> Result<serde_json::Value, String> {
            Ok(serde_json::json!({
                "kty": "OKP",
                "crv": "Ed25519",
                "x": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
            }))
        }

        fn sign(&self, _app_tag: &str, challenge: &[u8]) -> Result<Vec<u8>, String> {
            assert_eq!(challenge, b"openrtc:v2:test");
            Ok(vec![7; 64])
        }

        fn delete(&self, _app_tag: &str) -> Result<(), String> {
            Ok(())
        }

        fn read_secure_record(&self, app_tag: &str, key: &str) -> Result<Option<String>, String> {
            Ok(self
                .records
                .lock()
                .unwrap()
                .get(&format!("{app_tag}:{key}"))
                .cloned())
        }

        fn write_secure_record(&self, app_tag: &str, key: &str, value: &str) -> Result<(), String> {
            self.records
                .lock()
                .unwrap()
                .insert(format!("{app_tag}:{key}"), value.to_string());
            Ok(())
        }

        fn delete_secure_record(&self, app_tag: &str, key: &str) -> Result<(), String> {
            self.records
                .lock()
                .unwrap()
                .remove(&format!("{app_tag}:{key}"));
            Ok(())
        }
    }

    impl TransportInstaller for FakeTransportInstaller {
        fn id(&self) -> &'static str {
            "ble"
        }

        fn is_requested(&self, config: &openrtc::client::TransportConfig) -> bool {
            config.ble.as_ref().is_some_and(|ble| ble.enabled)
        }

        fn install(
            &self,
            _client: Arc<openrtc::client::Client>,
            _config: openrtc::client::TransportConfig,
            _context: InstallContext,
        ) -> InstallFuture {
            self.installs.fetch_add(1, Ordering::SeqCst);
            Box::pin(async { Ok(Box::new(()) as Box<dyn std::any::Any + Send + Sync>) })
        }
    }

    #[derive(Debug)]
    struct UnavailableTransportInstaller;

    impl TransportInstaller for UnavailableTransportInstaller {
        fn id(&self) -> &'static str {
            "ble"
        }

        fn is_requested(&self, config: &openrtc::client::TransportConfig) -> bool {
            config.ble.as_ref().is_some_and(|ble| ble.enabled)
        }

        fn install(
            &self,
            _client: Arc<openrtc::client::Client>,
            _config: openrtc::client::TransportConfig,
            _context: InstallContext,
        ) -> InstallFuture {
            Box::pin(async { Err("Bluetooth hardware unavailable".to_string()) })
        }
    }

    fn requested_ble_config() -> openrtc::client::TransportConfig {
        openrtc::client::TransportConfig {
            ble: Some(openrtc::client::BleConfig {
                enabled: true,
                ..openrtc::client::BleConfig::default()
            }),
            ..openrtc::client::TransportConfig::default()
        }
    }

    fn test_config() -> OpenRtcTauriConfig {
        OpenRtcTauriConfig {
            api_key: format!("pk_test_{}", "a".repeat(40)),
            ..OpenRtcTauriConfig::default()
        }
    }

    #[test]
    fn native_room_architecture_requires_fixed_intent_until_rust_owns_the_gateway_handle() {
        let mut registry = NativeCapabilityRegistry::default();
        registry
            .register_with_architecture(
                "room:adaptive".to_string(),
                "room".to_string(),
                "adaptive".to_string(),
                true,
                Some(openrtc::native::RoomArchitectureMode::Auto),
            )
            .expect("room registration");
        assert!(
            !registry.registrations["room:adaptive"].uses_sparse_fanout(),
            "caller-supplied auto state cannot promote sparse fanout",
        );
        registry
            .register_with_architecture(
                "room:fixed-sparse".to_string(),
                "room".to_string(),
                "fixed-sparse".to_string(),
                false,
                Some(openrtc::native::RoomArchitectureMode::Sparse),
            )
            .expect("fixed sparse room registration");
        assert!(registry.registrations["room:fixed-sparse"].uses_sparse_fanout());
    }

    #[test]
    fn native_room_architecture_rejects_non_room_and_respects_fixed_mesh_intent() {
        let mut registry = NativeCapabilityRegistry::default();
        assert!(registry
            .register_with_architecture(
                "space:not-room".to_string(),
                "space".to_string(),
                "not-room".to_string(),
                false,
                Some(openrtc::native::RoomArchitectureMode::Auto),
            )
            .is_err());
        registry
            .register_with_architecture(
                "room:fixed".to_string(),
                "room".to_string(),
                "fixed".to_string(),
                false,
                Some(openrtc::native::RoomArchitectureMode::Mesh),
            )
            .expect("fixed room registration");
        assert!(!registry.registrations["room:fixed"].uses_sparse_fanout());
    }

    #[test]
    fn native_capability_registry_isolates_duplicate_peer_channels() {
        let mut registry = NativeCapabilityRegistry::default();
        registry
            .register(
                "devices:user-1".to_string(),
                "devices".to_string(),
                "user-1".to_string(),
                false,
            )
            .expect("devices registration");
        registry
            .register(
                "space:room-1".to_string(),
                "space".to_string(),
                "room-1".to_string(),
                false,
            )
            .expect("space registration");
        registry
            .registrations
            .get_mut("devices:user-1")
            .unwrap()
            .desired_peers = vec![serde_json::json!({
            "deviceId": "shared-peer",
            "nodeId": "device-route"
        })];
        registry
            .registrations
            .get_mut("space:room-1")
            .unwrap()
            .desired_peers = vec![serde_json::json!({
            "deviceId": "shared-peer",
            "nodeId": "space-route"
        })];

        assert_eq!(
            registry.capability_keys_for_identity(
                Some("shared-peer"),
                Some("shared-peer"),
                None,
                None,
            ),
            vec!["devices:user-1".to_string(), "space:room-1".to_string()]
        );

        let explicit_channel = openrtc::stream_metadata::ChannelMetadata {
            channel_id: openrtc::stream_metadata::PUBLIC_PEER_STREAM_CHANNEL_ID.to_string(),
            metadata: Some(serde_json::Map::from_iter([(
                "openrtcCapability".to_string(),
                serde_json::json!("space:room-1"),
            )])),
        };
        assert_eq!(
            registry.projected_stream_capability(&explicit_channel),
            Some("space:room-1".to_string())
        );

        let unscoped_channel = openrtc::stream_metadata::ChannelMetadata {
            channel_id: openrtc::stream_metadata::PUBLIC_PEER_STREAM_CHANNEL_ID.to_string(),
            metadata: None,
        };
        assert_eq!(
            registry.projected_stream_capability(&unscoped_channel),
            None
        );
    }

    #[test]
    fn native_capability_registry_aggregates_without_duplicating_root_peers() {
        let mut registry = NativeCapabilityRegistry::default();
        for (key, kind, id) in [
            ("devices:user-1", "devices", "user-1"),
            ("space:room-1", "space", "room-1"),
        ] {
            registry
                .register(key.to_string(), kind.to_string(), id.to_string(), false)
                .expect("capability registration");
            registry.registrations.get_mut(key).unwrap().desired_peers =
                vec![serde_json::json!({"deviceId": "shared-peer", "ticket": "ticket-a"})];
        }

        let (first_revision, peers_json) = registry.aggregate_desired_peers().unwrap();
        let peers: Vec<serde_json::Value> = serde_json::from_str(&peers_json).unwrap();
        assert_eq!(first_revision, 1);
        assert_eq!(peers.len(), 1, "one physical peer must be dialed once");

        registry
            .register(
                "devices:user-1".to_string(),
                "devices".to_string(),
                "user-1".to_string(),
                false,
            )
            .expect("exact registration is idempotent");
        assert!(registry
            .register(
                "devices:user-1".to_string(),
                "space".to_string(),
                "room-1".to_string(),
                false,
            )
            .is_err());
    }

    #[test]
    fn native_capability_registry_merges_sparse_roles_deterministically() {
        fn aggregate(reverse_registration_order: bool) -> (u64, Vec<serde_json::Value>) {
            let mut registry = NativeCapabilityRegistry::default();
            let registrations = if reverse_registration_order {
                [
                    ("space:backup", "space", "backup"),
                    ("room:active", "room", "active"),
                ]
            } else {
                [
                    ("room:active", "room", "active"),
                    ("space:backup", "space", "backup"),
                ]
            };
            for (key, kind, id) in registrations {
                registry
                    .register(key.to_string(), kind.to_string(), id.to_string(), false)
                    .unwrap();
            }
            registry
                .registrations
                .get_mut("room:active")
                .unwrap()
                .desired_peers = vec![serde_json::json!({
                "deviceId": "shared-peer",
                "ticket": "active-ticket",
                "topologyRole": "active",
                "topologyRevision": 3,
            })];
            registry
                .registrations
                .get_mut("space:backup")
                .unwrap()
                .desired_peers = vec![serde_json::json!({
                "deviceId": "shared-peer",
                "ticket": "backup-ticket",
                "topologyRole": "backup",
                "topologyRevision": 100,
            })];
            let (revision, peers_json) = registry.aggregate_desired_peers().unwrap();
            (revision, serde_json::from_str(&peers_json).unwrap())
        }

        let forward = aggregate(false);
        let reverse = aggregate(true);
        assert_eq!(
            forward, reverse,
            "registration order is not lifecycle authority"
        );
        assert_eq!(forward.0, 1);
        assert_eq!(forward.1.len(), 1);
        assert_eq!(forward.1[0]["ticket"], "active-ticket");
        assert_eq!(forward.1[0]["topologyRole"], "active");
        assert_eq!(forward.1[0]["topologyRevision"], 1);
    }

    #[test]
    fn native_capability_registry_keeps_physical_peer_until_all_references_withdraw() {
        let mut registry = NativeCapabilityRegistry::default();
        for (key, kind) in [("room:a", "room"), ("space:b", "space")] {
            registry
                .register(key.to_string(), kind.to_string(), key.to_string(), false)
                .unwrap();
        }
        registry
            .registrations
            .get_mut("room:a")
            .unwrap()
            .desired_peers = vec![serde_json::json!({
            "deviceId": "shared-peer",
            "topologyRole": "backup",
            "topologyRevision": 41,
        })];
        registry
            .registrations
            .get_mut("space:b")
            .unwrap()
            .desired_peers = vec![serde_json::json!({
            "deviceId": "shared-peer",
            "nodeId": "shared-node",
            "ticket": "space-ticket",
            "topologyRole": "active",
            "topologyRevision": 7,
        })];

        let (_, both_json) = registry.aggregate_desired_peers().unwrap();
        let both: Vec<serde_json::Value> = serde_json::from_str(&both_json).unwrap();
        assert_eq!(both.len(), 1);
        assert_eq!(both[0]["topologyRole"], "active");
        assert_eq!(both[0]["ticket"], "space-ticket");
        assert_eq!(
            registry.registrations["room:a"].desired_peers[0]["topologyRevision"], 41,
            "root projection must not rewrite avenue-local lease state",
        );

        registry
            .registrations
            .get_mut("space:b")
            .unwrap()
            .desired_peers
            .clear();
        let (_, room_only_json) = registry.aggregate_desired_peers().unwrap();
        let room_only: Vec<serde_json::Value> = serde_json::from_str(&room_only_json).unwrap();
        assert_eq!(
            room_only.len(),
            1,
            "one remaining capability keeps the leg desired"
        );
        assert_eq!(room_only[0]["topologyRole"], "backup");

        registry
            .registrations
            .get_mut("room:a")
            .unwrap()
            .desired_peers
            .clear();
        let (_, empty_json) = registry.aggregate_desired_peers().unwrap();
        let empty: Vec<serde_json::Value> = serde_json::from_str(&empty_json).unwrap();
        assert!(
            empty.is_empty(),
            "physical desire ends only after every reference withdraws"
        );
    }

    #[test]
    fn native_capability_registry_scopes_peer_data_and_rejects_unscoped_streams() {
        let mut registry = NativeCapabilityRegistry::default();
        registry
            .register(
                "devices:user-1".to_string(),
                "devices".to_string(),
                "user-1".to_string(),
                false,
            )
            .unwrap();
        registry
            .registrations
            .get_mut("devices:user-1")
            .unwrap()
            .desired_peers = vec![serde_json::json!({"deviceId": "peer-1"})];

        let explicit = openrtc::client::NativePeerDataEvent {
            connection_id: "peer-1".to_string(),
            remote_node_id: None,
            transport: "webrtc".to_string(),
            transport_stable_id: 1,
            transport_generation: 1,
            route_generation: 1,
            payload: serde_json::to_vec(&serde_json::json!({
                "capability": "devices:user-1",
                "kind": "raw",
                "payload": [1, 2, 3]
            }))
            .unwrap(),
        };
        assert_eq!(
            registry.capability_keys_for_peer_data(&explicit),
            vec!["devices:user-1".to_string()]
        );

        let unknown = openrtc::client::NativePeerDataEvent {
            payload: serde_json::to_vec(&serde_json::json!({
                "capability": "space:unknown",
                "kind": "raw"
            }))
            .unwrap(),
            ..explicit.clone()
        };
        assert!(registry.capability_keys_for_peer_data(&unknown).is_empty());

        registry
            .register(
                "space:shared".to_string(),
                "space".to_string(),
                "shared".to_string(),
                false,
            )
            .unwrap();
        registry
            .registrations
            .get_mut("space:shared")
            .unwrap()
            .desired_peers = vec![serde_json::json!({"deviceId": "peer-1"})];
        let unscoped = openrtc::client::NativePeerDataEvent {
            payload: serde_json::to_vec(&serde_json::json!({
                "kind": "raw",
                "payload": [1, 2, 3]
            }))
            .unwrap(),
            ..explicit.clone()
        };
        assert!(
            registry.capability_keys_for_peer_data(&unscoped).is_empty(),
            "a shared physical peer cannot fan unscoped data into two avenues",
        );

        let unscoped_channel = openrtc::stream_metadata::ChannelMetadata {
            channel_id: openrtc::stream_metadata::PUBLIC_PEER_STREAM_CHANNEL_ID.to_string(),
            metadata: None,
        };
        assert_eq!(
            registry.projected_stream_capability(&unscoped_channel),
            None,
            "stream ownership must never be inferred from capability count"
        );
    }

    #[test]
    fn native_device_proof_uses_host_signer_without_exporting_private_key() {
        let state = OpenRtcTauriState::new(test_config())
            .with_native_device_key_signer(Arc::new(FakeDeviceKeySigner::default()));
        assert_eq!(
            state
                .native_device_key_signer
                .as_deref()
                .unwrap()
                .offline_assurance("app_native_test"),
            openrtc::offline::OfflineAssurance::Software
        );
        let public = state
            .device_public_key("app_native_test")
            .expect("public key");
        assert_eq!(public["kty"], "OKP");
        assert_eq!(public["crv"], "Ed25519");
        assert!(public.get("d").is_none());
        let signature = state
            .sign_device_proof("app_native_test", "openrtc:v2:test")
            .expect("signature");
        assert_eq!(
            base64::engine::general_purpose::URL_SAFE_NO_PAD
                .decode(signature)
                .expect("base64"),
            vec![7; 64]
        );
    }

    #[test]
    fn offline_support_reports_signer_and_compiled_lan_truth() {
        let unavailable = OpenRtcTauriState::new(test_config()).offline_runtime_support();
        assert!(!unavailable.provisioning);
        assert_eq!(unavailable.local_mesh, cfg!(feature = "transport-lan"));
        assert_eq!(
            unavailable.reason,
            Some("native host device signer is unavailable")
        );

        let available = OpenRtcTauriState::new(test_config())
            .with_native_device_key_signer(Arc::new(FakeDeviceKeySigner::default()))
            .offline_runtime_support();
        assert!(available.provisioning);
        assert_eq!(available.local_mesh, cfg!(feature = "transport-lan"));
        assert_eq!(
            available.reason,
            (!cfg!(feature = "transport-lan"))
                .then_some("native host was built without transport-lan"),
        );
    }

    #[tokio::test]
    async fn public_runtime_status_uses_host_facts_and_keeps_broadcast_unavailable() {
        use openrtc::client::CapabilityMaturity;

        let unavailable_state = OpenRtcTauriState::new(test_config());
        let unavailable = unavailable_state
            .project_public_runtime_status(unavailable_state.client().runtime_status().await);
        assert_eq!(
            unavailable.product_maturity.offline_edge,
            CapabilityMaturity::Unavailable
        );
        assert_eq!(
            unavailable.product_maturity.broadcast,
            CapabilityMaturity::Unavailable
        );
        let serialized = serde_json::to_value(&unavailable).expect("serialized runtime status");
        assert_eq!(serialized["productMaturity"]["offlineEdge"], "unavailable");
        assert_eq!(serialized["productMaturity"]["broadcast"], "unavailable");

        let installed_state = OpenRtcTauriState::new(test_config())
            .with_native_device_key_signer(Arc::new(FakeDeviceKeySigner::default()));
        let installed = installed_state
            .project_public_runtime_status(installed_state.client().runtime_status().await);
        assert_eq!(
            installed.product_maturity.offline_edge,
            if cfg!(feature = "transport-lan") {
                CapabilityMaturity::Preview
            } else {
                CapabilityMaturity::SupportOnly
            }
        );
        assert_eq!(
            installed.product_maturity.broadcast,
            CapabilityMaturity::Unavailable
        );
    }

    #[test]
    fn native_certificate_records_round_trip_through_host_secure_storage() {
        let state = OpenRtcTauriState::new(test_config())
            .with_native_device_key_signer(Arc::new(FakeDeviceKeySigner::default()));
        let app_tag = "app_native_test";
        let key = "openrtc:v2:device-session:abc:device-1";
        assert_eq!(state.read_secure_record(app_tag, key).unwrap(), None);
        state
            .write_secure_record(app_tag, key, "{\"token\":\"bound\"}")
            .unwrap();
        assert_eq!(
            state.read_secure_record(app_tag, key).unwrap().as_deref(),
            Some("{\"token\":\"bound\"}")
        );
        state.delete_secure_record(app_tag, key).unwrap();
        assert_eq!(state.read_secure_record(app_tag, key).unwrap(), None);
    }

    #[test]
    fn native_device_proof_fails_closed_without_secure_host_signer() {
        let state = OpenRtcTauriState::new(test_config());
        assert!(state
            .device_public_key("app_native_test")
            .expect_err("missing signer must fail")
            .contains("secure-storage signer"));
    }

    fn native_transport_install_context() -> InstallContext {
        InstallContext {
            data_dir: std::env::temp_dir().join("openrtc-tauri-native-transport-tests"),
        }
    }

    fn managed_session_test_result(device_id: &str) -> StartSessionResult {
        StartSessionResult {
            local_node_id: format!("node-{device_id}"),
            ticket_scope: Some("user-device".to_string()),
            ticket: None,
            presence_started: true,
            auto_connect_started: true,
            local_device: openrtc::native_device::NativeDeviceIdentity {
                device_id: device_id.to_string(),
                device_name: "Test Device".to_string(),
                created_at_ms: 1,
                updated_at_ms: 1,
                name_source: None,
                system_info: None,
            },
        }
    }

    async fn simulate_managed_session_start(
        state: Arc<OpenRtcTauriState>,
        device_id: String,
        pause: Option<(oneshot::Sender<()>, oneshot::Receiver<()>)>,
        starts: Arc<AtomicUsize>,
        stopped_owners: Arc<Mutex<Vec<usize>>>,
    ) -> SessionDisposition {
        let _start_guard = state.managed_session_start_guard.lock().await;
        let client = state.client();
        let key = format!("{}:{device_id}", client.app_tag());
        let (disposition, active_epoch) = {
            let active = state.managed_session.lock().await;
            let disposition = managed_session_disposition(
                active.as_ref().map(|record| record.key.as_str()),
                active
                    .as_ref()
                    .is_some_and(|record| Arc::ptr_eq(&record.owner_client, &client)),
                active
                    .as_ref()
                    .is_some_and(|record| record.result.presence_started),
                active
                    .as_ref()
                    .is_some_and(|record| record.result.auto_connect_started),
                &key,
                true,
                true,
            );
            (
                disposition,
                active.as_ref().map(|record| record.owner_epoch),
            )
        };

        if disposition == SessionDisposition::Reuse {
            return disposition;
        }

        if disposition == SessionDisposition::Replace {
            let previous = state
                .managed_session
                .lock()
                .await
                .take()
                .expect("replacement must have a previous owner");
            stopped_owners
                .lock()
                .await
                .push(Arc::as_ptr(&previous.owner_client) as usize);
        }

        starts.fetch_add(1, Ordering::SeqCst);
        if let Some((entered, release)) = pause {
            entered.send(()).expect("start observer must be waiting");
            release.await.expect("start release must be sent");
        }

        let owner_epoch = match disposition {
            SessionDisposition::Refresh => {
                active_epoch.expect("refresh must preserve the active owner epoch")
            }
            SessionDisposition::Start | SessionDisposition::Replace => {
                state.allocate_managed_session_owner_epoch()
            }
            SessionDisposition::Reuse => unreachable!("reuse returned before startup"),
        };
        let result = managed_session_test_result(&device_id);
        *state.managed_session.lock().await = Some(ManagedSessionRecord {
            key,
            owner_client: client,
            owner_epoch,
            result,
        });
        disposition
    }

    #[tokio::test]
    async fn concurrent_same_key_start_reuses_one_owner_epoch() {
        let state = Arc::new(OpenRtcTauriState::new(test_config()));
        let starts = Arc::new(AtomicUsize::new(0));
        let stopped_owners = Arc::new(Mutex::new(Vec::new()));
        let (first_entered_tx, first_entered_rx) = oneshot::channel();
        let (first_release_tx, first_release_rx) = oneshot::channel();

        let first = tokio::spawn(simulate_managed_session_start(
            state.clone(),
            "same-device".to_string(),
            Some((first_entered_tx, first_release_rx)),
            starts.clone(),
            stopped_owners.clone(),
        ));
        first_entered_rx.await.expect("first start must pause");

        let (second_attempting_tx, second_attempting_rx) = oneshot::channel();
        let second_state = state.clone();
        let second_starts = starts.clone();
        let second_stopped_owners = stopped_owners.clone();
        let second = tokio::spawn(async move {
            second_attempting_tx.send(()).unwrap();
            simulate_managed_session_start(
                second_state,
                "same-device".to_string(),
                None,
                second_starts,
                second_stopped_owners,
            )
            .await
        });
        second_attempting_rx.await.unwrap();
        tokio::task::yield_now().await;
        assert_eq!(starts.load(Ordering::SeqCst), 1);

        first_release_tx.send(()).unwrap();
        assert_eq!(
            first.await.expect("first start task"),
            SessionDisposition::Start
        );
        assert_eq!(
            second.await.expect("second start task"),
            SessionDisposition::Reuse
        );
        assert_eq!(starts.load(Ordering::SeqCst), 1);

        let active = state
            .managed_session
            .lock()
            .await
            .clone()
            .expect("active owner");
        assert_eq!(active.owner_epoch, 1);
        assert!(Arc::ptr_eq(&active.owner_client, &state.client()));
        assert!(stopped_owners.lock().await.is_empty());
    }

    #[tokio::test]
    async fn concurrent_different_key_start_replaces_prior_owner_without_late_overwrite() {
        let state = Arc::new(OpenRtcTauriState::new(test_config()));
        let starts = Arc::new(AtomicUsize::new(0));
        let stopped_owners = Arc::new(Mutex::new(Vec::new()));
        let (first_entered_tx, first_entered_rx) = oneshot::channel();
        let (first_release_tx, first_release_rx) = oneshot::channel();

        let first = tokio::spawn(simulate_managed_session_start(
            state.clone(),
            "first-device".to_string(),
            Some((first_entered_tx, first_release_rx)),
            starts.clone(),
            stopped_owners.clone(),
        ));
        first_entered_rx.await.expect("first start must pause");
        let first_owner = state.client();

        let (second_attempting_tx, second_attempting_rx) = oneshot::channel();
        let second_state = state.clone();
        let second_starts = starts.clone();
        let second_stopped_owners = stopped_owners.clone();
        let second = tokio::spawn(async move {
            second_attempting_tx.send(()).unwrap();
            simulate_managed_session_start(
                second_state,
                "second-device".to_string(),
                None,
                second_starts,
                second_stopped_owners,
            )
            .await
        });
        second_attempting_rx.await.unwrap();
        tokio::task::yield_now().await;
        assert!(Arc::ptr_eq(&first_owner, &state.client()));

        first_release_tx.send(()).unwrap();
        assert_eq!(
            first.await.expect("first start task"),
            SessionDisposition::Start
        );
        assert_eq!(
            second.await.expect("replacement start task"),
            SessionDisposition::Replace
        );
        assert_eq!(starts.load(Ordering::SeqCst), 2);

        let active = state
            .managed_session
            .lock()
            .await
            .clone()
            .expect("active owner");
        assert_eq!(active.owner_epoch, 2);
        assert!(active.key.contains("second-device"));
        assert!(Arc::ptr_eq(&active.owner_client, &state.client()));
        assert_eq!(
            stopped_owners.lock().await.as_slice(),
            [Arc::as_ptr(&first_owner) as usize]
        );
        assert!(Arc::ptr_eq(&active.owner_client, &first_owner));
    }

    #[test]
    fn derives_app_tag_from_api_key_by_default() {
        let config = OpenRtcTauriConfig {
            api_key: format!("pk_test_{}", "b".repeat(24) + "1234567890abcdef"),
            ..OpenRtcTauriConfig::default()
        };

        assert_eq!(config.app_tag().unwrap(), "app_1234567890abcdef");
    }

    #[tokio::test]
    async fn requested_native_transport_without_installer_keeps_base_route_available() {
        let state = OpenRtcTauriState::new(test_config());
        let client = state.client();
        ensure_requested_native_transports(
            &state,
            &client,
            Some(&requested_ble_config()),
            &native_transport_install_context(),
        )
        .await
        .expect("an unavailable optional transport must not fail base Iroh startup");

        assert!(state.installed_native_transports.lock().await.is_empty());
    }

    #[tokio::test]
    async fn native_transport_installer_is_idempotent_for_one_client() {
        let installs = Arc::new(AtomicUsize::new(0));
        let state = OpenRtcTauriState::new(test_config()).with_native_transport_installer(
            Arc::new(FakeTransportInstaller {
                installs: installs.clone(),
            }),
        );
        let client = state.client();
        let config = requested_ble_config();

        ensure_requested_native_transports(
            &state,
            &client,
            Some(&config),
            &native_transport_install_context(),
        )
        .await
        .expect("first install");
        ensure_requested_native_transports(
            &state,
            &client,
            Some(&config),
            &native_transport_install_context(),
        )
        .await
        .expect("idempotent install");

        assert_eq!(installs.load(Ordering::SeqCst), 1);
    }

    #[tokio::test]
    async fn unavailable_native_transport_keeps_base_route_available() {
        let state = OpenRtcTauriState::new(test_config())
            .with_native_transport_installer(Arc::new(UnavailableTransportInstaller));
        let client = state.client();

        ensure_requested_native_transports(
            &state,
            &client,
            Some(&requested_ble_config()),
            &native_transport_install_context(),
        )
        .await
        .expect("optional transport installation failure must not fail base Iroh startup");

        assert!(state.installed_native_transports.lock().await.is_empty());
    }

    #[test]
    fn invalid_or_missing_api_key_fails_closed() {
        assert!(OpenRtcTauriConfig::default().validated_api_key().is_err());
        let mut config = OpenRtcTauriConfig::default();
        config.api_key = "pk_test_short".to_string();
        assert!(config.validated_api_key().is_err());
    }

    #[cfg(feature = "native-broadcast-moq")]
    #[test]
    fn draft16_broadcast_feature_installs_one_private_native_adapter() {
        let state = OpenRtcTauriState::new(test_config());
        assert!(state.native_broadcast_adapter.is_some());
        assert!(state.native_broadcast_moq_adapter.is_some());
    }

    #[test]
    fn from_env_uses_api_key_and_ignores_legacy_namespace_selectors() {
        let previous_api_key = std::env::var("VITE_OPENRTC_API_KEY").ok();
        let previous_project = std::env::var("VITE_OPENRTC_PROJECT_ID").ok();
        let previous_app_tag = std::env::var("VITE_PLUTO_OPENRTC_APP_TAG").ok();
        let api_key = format!("pk_test_{}", "c".repeat(40));
        std::env::set_var("VITE_OPENRTC_API_KEY", &api_key);
        std::env::set_var("VITE_OPENRTC_PROJECT_ID", "pluto-rtc-prod");
        std::env::set_var("VITE_PLUTO_OPENRTC_APP_TAG", "app_from_vite_env");

        let config = OpenRtcTauriConfig::from_env();

        assert_eq!(config.api_key, api_key);
        assert_eq!(
            config.app_tag().unwrap(),
            openrtc::app_tag_from_api_key(&api_key)
        );

        match previous_api_key {
            Some(value) => std::env::set_var("VITE_OPENRTC_API_KEY", value),
            None => std::env::remove_var("VITE_OPENRTC_API_KEY"),
        }
        match previous_project {
            Some(value) => std::env::set_var("VITE_OPENRTC_PROJECT_ID", value),
            None => std::env::remove_var("VITE_OPENRTC_PROJECT_ID"),
        }
        match previous_app_tag {
            Some(value) => std::env::set_var("VITE_PLUTO_OPENRTC_APP_TAG", value),
            None => std::env::remove_var("VITE_PLUTO_OPENRTC_APP_TAG"),
        }
    }

    #[test]
    fn native_state_has_one_constructor_owned_app_identity() {
        let config = test_config();
        let expected = openrtc::app_tag_from_api_key(&config.api_key);
        let state = OpenRtcTauriState::new(config);
        let first = state.client();
        let second = state.client();

        assert_eq!(first.app_tag(), expected);
        assert!(Arc::ptr_eq(&first, &second));
    }

    #[test]
    fn managed_session_uses_persisted_native_device_id() {
        let identity = openrtc::native_device::NativeDeviceIdentity {
            device_id: "persisted-native-device".to_string(),
            device_name: "Mac".to_string(),
            created_at_ms: 1,
            updated_at_ms: 1,
            name_source: None,
            system_info: None,
        };

        assert_eq!(
            managed_session_device_id(Some(" desktop-e2e-native "), &identity),
            "persisted-native-device"
        );
        assert_eq!(
            managed_session_device_id(None, &identity),
            "persisted-native-device"
        );
    }

    #[test]
    fn repeated_managed_session_triggers_converge_on_one_owner() {
        let key = "app:persisted-native-device";
        let cases = [
            ("react-remount", true, true, true, true),
            ("hmr", true, true, true, true),
            ("auth-refresh", true, true, true, true),
            ("resume", true, true, true, true),
            ("alias-change", true, true, true, true),
        ];
        for (label, active_presence, active_auto, requested_presence, requested_auto) in cases {
            assert_eq!(
                managed_session_disposition(
                    Some(key),
                    true,
                    active_presence,
                    active_auto,
                    key,
                    requested_presence,
                    requested_auto,
                ),
                SessionDisposition::Reuse,
                "{label} must reuse the authoritative tuple"
            );
        }

        assert_eq!(
            managed_session_disposition(Some(key), true, false, true, key, true, true),
            SessionDisposition::Refresh,
            "failed presence startup must retry idempotently"
        );
        assert_eq!(
            managed_session_disposition(
                Some(key),
                true,
                true,
                true,
                "app:other-native-device",
                true,
                true,
            ),
            SessionDisposition::Replace,
            "a physical native device change must replace the previous lifecycle owner"
        );
        assert_eq!(
            managed_session_disposition(Some(key), false, true, true, key, true, true),
            SessionDisposition::Replace,
            "the same tuple on a different client epoch must replace the previous owner"
        );
    }

    #[test]
    fn user_device_revocation_invalidates_the_cached_managed_ticket() {
        assert!(revokes_managed_session("user-device"));
        assert!(revokes_managed_session("  user-device  "));
        assert!(!revokes_managed_session("share:example"));
        assert!(!revokes_managed_session(""));
    }

    #[test]
    fn managed_session_metadata_uses_authoritative_device_id() {
        let raw = serde_json::json!({
            "deviceId": "persisted-native-device",
            "assistantDevice": {
                "deviceId": "desktop-e2e-native"
            }
        })
        .to_string();

        let metadata =
            metadata_with_authoritative_device_id(Some(raw), "desktop-e2e-native").unwrap();
        let parsed: serde_json::Value = serde_json::from_str(&metadata).unwrap();

        assert_eq!(parsed["deviceId"], "desktop-e2e-native");
        assert_eq!(parsed["assistantDevice"]["deviceId"], "desktop-e2e-native");
    }
}