eoka 0.7.1

//! CDP Connection/Session Management
//!
//! Manages browser and page sessions over the CDP transport.

mod document;
mod input;
mod network;
mod page;

use std::collections::HashMap;
use std::future::Future;
use std::sync::{Arc, Mutex};

use super::transport::Transport;
use super::types::*;
use crate::error::Result;
use crate::page::HeldInputState;

type TargetRegistry = Arc<Mutex<HashMap<String, Arc<TargetState>>>>;

struct TargetState {
    actions: Arc<crate::action::ActionState>,
    held_input: Arc<tokio::sync::Mutex<HeldInputState>>,
    headers: Arc<super::headers::HeaderState>,
    monitor: tokio::sync::Mutex<Option<Arc<super::network_idle::NetworkMonitor>>>,
    viewport: Arc<tokio::sync::Mutex<page::ViewportState>>,
    recording: crate::recording::RecordingSlot,
}

fn state_for_target(
    registry: &TargetRegistry,
    target_id: &str,
    transport: &Transport,
) -> Arc<TargetState> {
    let mut targets = registry
        .lock()
        .unwrap_or_else(|poisoned| poisoned.into_inner());
    if let Some(state) = targets.get(target_id) {
        return Arc::clone(state);
    }
    let state = Arc::new(TargetState {
        actions: Arc::default(),
        held_input: Arc::default(),
        headers: Arc::default(),
        monitor: tokio::sync::Mutex::new(None),
        viewport: page::viewport_for_target(transport.browser_endpoint(), target_id),
        recording: crate::recording::recording_for_target(transport.browser_endpoint(), target_id),
    });
    targets.insert(target_id.to_owned(), Arc::clone(&state));
    state
}

/// A CDP connection to Chrome
pub struct Connection {
    transport: Arc<Transport>,
    /// Target state survives dropped Page handles, including failed header cleanup.
    /// Explicit target closure or connection teardown releases the retained state.
    targets: TargetRegistry,
}

impl Connection {
    /// Create a new connection wrapping a transport
    pub(crate) fn new(transport: Transport) -> Self {
        Self {
            transport: Arc::new(transport),
            targets: Arc::new(Mutex::new(HashMap::new())),
        }
    }

    /// Get a reference to the transport
    pub fn transport(&self) -> &Arc<Transport> {
        &self.transport
    }

    /// Get browser version info
    pub(crate) async fn version(&self) -> Result<BrowserGetVersionResult> {
        self.transport
            .send("Browser.getVersion", &BrowserGetVersion {})
            .await
    }

    /// Create a new target (tab)
    pub(crate) async fn create_target(
        &self,
        url: &str,
        width: Option<u32>,
        height: Option<u32>,
    ) -> Result<String> {
        let result: TargetCreateTargetResult = self
            .transport
            .send(
                "Target.createTarget",
                &TargetCreateTarget {
                    url: url.to_string(),
                    width,
                    height,
                },
            )
            .await?;
        Ok(result.target_id)
    }

    /// Attach to a target and get a session
    pub(crate) async fn attach_to_target(&self, target_id: &str) -> Result<Session> {
        let result: TargetAttachToTargetResult = self
            .transport
            .send(
                "Target.attachToTarget",
                &TargetAttachToTarget {
                    target_id: target_id.to_string(),
                    flatten: Some(true),
                },
            )
            .await?;

        Ok(Session {
            transport: Arc::clone(&self.transport),
            session_id: result.session_id,
            target_id: target_id.to_string(),
            target: state_for_target(&self.targets, target_id, &self.transport),
            targets: Arc::clone(&self.targets),
        })
    }

    /// Close a target
    pub(crate) async fn close_target(&self, target_id: &str) -> Result<bool> {
        let connection = self.teardown_owner();
        let target_id = target_id.to_owned();
        owned_teardown(async move { connection.close_target_owned(&target_id).await }).await
    }

    async fn close_target_owned(&self, target_id: &str) -> Result<bool> {
        let cleanup = self.cancel_target_recording(target_id).await;
        let result: Result<TargetCloseTargetResult> = self
            .transport
            .send(
                "Target.closeTarget",
                &TargetCloseTarget {
                    target_id: target_id.to_string(),
                },
            )
            .await;
        match result {
            Ok(result) => {
                if result.success {
                    self.remove_target(target_id).await;
                }
                cleanup?;
                Ok(result.success)
            }
            Err(primary) => Err(match cleanup {
                Ok(()) => primary,
                Err(cleanup) => crate::Error::cdp_msg(format!(
                    "Target close: {primary}; recording cleanup: {cleanup}"
                )),
            }),
        }
    }

    /// Get all targets (tabs)
    pub(crate) async fn get_targets(&self) -> Result<Vec<TargetInfo>> {
        let result: TargetGetTargetsResult = self
            .transport
            .send("Target.getTargets", &TargetGetTargets {})
            .await?;
        Ok(result.target_infos)
    }

    async fn remove_target(&self, target_id: &str) {
        let state = self
            .targets
            .lock()
            .unwrap_or_else(|poisoned| poisoned.into_inner())
            .remove(target_id);
        if let Some(state) = state {
            if let Some(monitor) = state.monitor.lock().await.as_ref() {
                monitor.closed();
            }
        }
    }

    /// Activate (focus) a target
    pub(crate) async fn activate_target(&self, target_id: &str) -> Result<()> {
        self.send_void(
            "Target.activateTarget",
            &TargetActivateTarget {
                target_id: target_id.to_string(),
            },
        )
        .await
    }

    /// Send a fire-and-forget command (discard the response)
    async fn send_void<C: serde::Serialize>(&self, method: &str, params: &C) -> Result<()> {
        self.transport
            .send::<_, serde_json::Value>(method, params)
            .await?;
        Ok(())
    }

    /// Close the browser
    pub(crate) async fn close(&self) -> Result<()> {
        let connection = self.teardown_owner();
        owned_teardown(async move { connection.close_owned().await }).await
    }

    async fn close_owned(&self) -> Result<()> {
        let cleanup = self.cancel_recordings().await;
        if let Err(error) = self.send_void("Browser.close", &BrowserClose {}).await {
            // Chrome may close the socket before acknowledging Browser.close.
            // Transport::close still terminates and reaps managed Chrome.
            tracing::debug!("Browser.close command did not complete: {}", error);
        }
        let exited = self
            .transport
            .wait_for_owned_exit(std::time::Duration::from_secs(5))
            .await;
        if matches!(exited, Ok(false)) {
            tracing::warn!("Chrome did not exit after Browser.close; terminating it");
        }
        let closed = self.transport.close().await;
        combine_teardown(
            "Browser close",
            combine_teardown("Browser process wait", exited.map(|_| ()), closed),
            cleanup,
        )
    }
}

impl Connection {
    fn teardown_owner(&self) -> Self {
        Self {
            transport: Arc::clone(&self.transport),
            targets: Arc::clone(&self.targets),
        }
    }

    async fn cancel_target_recording(&self, target_id: &str) -> Result<()> {
        let slot = self
            .targets
            .lock()
            .unwrap_or_else(|e| e.into_inner())
            .get(target_id)
            .map(|state| Arc::clone(&state.recording));
        if let Some(slot) = slot {
            crate::recording::cancel_slot(&slot)
                .await
                .map_err(|error| {
                    crate::Error::cdp_msg(format!("Recording cleanup before target close: {error}"))
                })?;
        }
        Ok(())
    }

    pub(crate) async fn cancel_recordings(&self) -> Result<()> {
        let slots: Vec<_> = self
            .targets
            .lock()
            .unwrap_or_else(|e| e.into_inner())
            .values()
            .map(|state| Arc::clone(&state.recording))
            .collect();
        let mut cleanup = Vec::new();
        let mut tasks = tokio::task::JoinSet::new();
        for slot in slots {
            let transport = Arc::clone(&self.transport);
            tasks.spawn(async move {
                crate::recording::cancel_owned_slot(&slot, &transport, None).await
            });
        }
        while let Some(result) = tasks.join_next().await {
            match result {
                Ok(Ok(())) => {}
                Ok(Err(error)) => cleanup.push(error.to_string()),
                Err(error) => cleanup.push(format!("Recording cleanup task failed: {error}")),
            }
        }
        if cleanup.is_empty() {
            Ok(())
        } else {
            Err(crate::Error::cdp_msg(format!(
                "Recording cleanup: {}",
                cleanup.join("; ")
            )))
        }
    }

    pub(crate) async fn disconnect(&self) -> Result<()> {
        let connection = self.teardown_owner();
        owned_teardown(async move {
            let cleanup = connection.cancel_recordings().await;
            let closed = connection.transport.close().await;
            combine_teardown("Browser disconnect", closed, cleanup)
        })
        .await
    }
}

/// A CDP session attached to a specific target. Cheap to clone; clones share
/// the underlying transport and per-target input, header and network state.
#[derive(Clone)]
pub struct Session {
    transport: Arc<Transport>,
    session_id: String,
    target_id: String,
    /// Per-target native input state shared by Page and Human helpers.
    target: Arc<TargetState>,
    targets: TargetRegistry,
}

impl Session {
    pub(crate) fn recording_slot(&self) -> crate::recording::RecordingSlot {
        Arc::clone(&self.target.recording)
    }

    pub(crate) async fn send_tracked(
        &self,
        method: &str,
        params: &serde_json::Value,
        dispatch: &super::transport::CommandDispatch,
    ) -> Result<serde_json::Value> {
        self.target.headers.wait().await?;
        self.transport
            .send_to_session_with_dispatch(&self.session_id, method, params, dispatch)
            .await
    }
    pub(crate) async fn navigation_guard(&self) -> Result<tokio::sync::OwnedMutexGuard<()>> {
        self.target.headers.lock().await
    }

    pub(crate) fn action_state(&self) -> Arc<crate::action::ActionState> {
        self.target.actions.clone()
    }
    /// Get the session ID
    pub fn session_id(&self) -> &str {
        &self.session_id
    }

    /// Get the target ID
    pub fn target_id(&self) -> &str {
        &self.target_id
    }

    /// Get a reference to the underlying transport (for event polling)
    pub fn transport(&self) -> &Arc<Transport> {
        &self.transport
    }

    /// Return the per-target held-input coordinator state.
    pub(crate) fn held_input(&self) -> Arc<tokio::sync::Mutex<HeldInputState>> {
        Arc::clone(&self.target.held_input)
    }

    pub(crate) async fn monitor_network(&self, fresh: bool) -> Result<()> {
        let mut monitor = self.target.monitor.lock().await;
        if monitor.is_none() {
            *monitor = Some(Arc::new(
                super::network_idle::NetworkMonitor::start(&self.transport, &self.target_id, fresh)
                    .await?,
            ));
        }
        Ok(())
    }

    pub(crate) async fn wait_for_network_idle(&self, idle_ms: u64, timeout_ms: u64) -> Result<()> {
        tokio::time::timeout(std::time::Duration::from_millis(timeout_ms), async {
            self.target.headers.wait().await?;
            let monitor = self.target.monitor.lock().await.clone().ok_or_else(|| {
                crate::Error::cdp_msg("Network idle monitoring is not initialized")
            })?;
            monitor.wait(idle_ms, timeout_ms).await
        })
        .await
        .map_err(|_| {
            crate::Error::Timeout("Network did not become idle before the deadline".into())
        })?
    }

    pub(crate) async fn attach_frame_target(&self, target_id: &str) -> Result<Session> {
        let result: TargetAttachToTargetResult = self
            .transport
            .send(
                "Target.attachToTarget",
                &TargetAttachToTarget {
                    target_id: target_id.to_string(),
                    flatten: Some(true),
                },
            )
            .await?;
        Ok(Session {
            transport: Arc::clone(&self.transport),
            session_id: result.session_id,
            target_id: target_id.to_string(),
            target: state_for_target(&self.targets, target_id, &self.transport),
            targets: Arc::clone(&self.targets),
        })
    }

    pub(crate) async fn detach(&self) -> Result<()> {
        let transport = Arc::clone(&self.transport);
        let slot = Arc::clone(&self.target.recording);
        let session_id = self.session_id.clone();
        owned_teardown(async move {
            let cleanup = crate::recording::cancel_owned_slot(&slot, &transport, Some(&session_id))
                .await
                .map_err(|error| {
                    crate::Error::cdp_msg(format!("Recording cleanup before detach: {error}"))
                });
            let detached = transport
                .send::<_, serde_json::Value>(
                    "Target.detachFromTarget",
                    &serde_json::json!({"sessionId":session_id}),
                )
                .await
                .map(|_| ());
            combine_teardown("Session detach", detached, cleanup)
        })
        .await
    }

    /// Send a command to this session
    pub async fn send<C, R>(&self, method: &str, params: &C) -> Result<R>
    where
        C: serde::Serialize,
        R: serde::de::DeserializeOwned,
    {
        self.target.headers.wait().await?;
        self.transport
            .send_to_session(&self.session_id, method, params)
            .await
    }

    /// Send a fire-and-forget command (discard the response)
    async fn send_void<C: serde::Serialize>(&self, method: &str, params: &C) -> Result<()> {
        self.send::<_, serde_json::Value>(method, params).await?;
        Ok(())
    }
}

fn combine_teardown(context: &str, primary: Result<()>, cleanup: Result<()>) -> Result<()> {
    match (primary, cleanup) {
        (Ok(()), result) | (result, Ok(())) => result,
        (Err(primary), Err(cleanup)) => Err(crate::Error::cdp_msg(format!(
            "{context}: {primary}; recording cleanup: {cleanup}"
        ))),
    }
}

async fn owned_teardown<T: Send + 'static>(
    operation: impl Future<Output = Result<T>> + Send + 'static,
) -> Result<T> {
    tokio::spawn(operation).await.map_err(|_| {
        crate::Error::cdp_msg(
            "Owned browser teardown ended without a result; native cleanup is uncertain",
        )
    })?
}