whatsapp-rust 0.5.0

use crate::client::Client;
use log::{debug, warn};
use thiserror::Error;
use wacore::StringEnum;
use wacore::iq::tctoken::build_tc_token_node;
use wacore_binary::builder::NodeBuilder;
use wacore_binary::jid::Jid;
use wacore_binary::node::Node;

#[derive(Debug, Error)]
pub enum PresenceError {
    #[error("cannot send presence without a push name set")]
    PushNameEmpty,
    #[error(transparent)]
    Other(#[from] anyhow::Error),
}

/// Presence status for online/offline state.
#[derive(Debug, Clone, Copy, PartialEq, Eq, StringEnum)]
pub enum PresenceStatus {
    #[str = "available"]
    Available,
    #[str = "unavailable"]
    Unavailable,
}

impl From<crate::types::presence::Presence> for PresenceStatus {
    fn from(p: crate::types::presence::Presence) -> Self {
        match p {
            crate::types::presence::Presence::Available => PresenceStatus::Available,
            crate::types::presence::Presence::Unavailable => PresenceStatus::Unavailable,
        }
    }
}

/// Feature handle for presence operations.
pub struct Presence<'a> {
    client: &'a Client,
}

impl<'a> Presence<'a> {
    pub(crate) fn new(client: &'a Client) -> Self {
        Self { client }
    }

    async fn build_subscription_node(&self, jid: &Jid) -> Node {
        let mut builder = NodeBuilder::new("presence")
            .attr("type", "subscribe")
            .attr("to", jid.clone());

        // Include tctoken if available (no t attribute, matching WhatsApp Web)
        if let Some(token) = self.client.lookup_tc_token_for_jid(jid).await {
            builder = builder.children([build_tc_token_node(&token)]);
        }

        builder.build()
    }

    fn build_unsubscription_node(&self, jid: &Jid) -> Node {
        NodeBuilder::new("presence")
            .attr("type", "unsubscribe")
            .attr("to", jid.clone())
            .build()
    }

    /// Set the presence status.
    pub async fn set(&self, status: PresenceStatus) -> Result<(), PresenceError> {
        let device_snapshot = self
            .client
            .persistence_manager()
            .get_device_snapshot()
            .await;

        debug!(
            "send_presence called with push_name: '{}'",
            device_snapshot.push_name
        );

        if device_snapshot.push_name.is_empty() {
            warn!("Cannot send presence: push_name is empty!");
            return Err(PresenceError::PushNameEmpty);
        }

        if status == PresenceStatus::Available {
            self.client.send_unified_session().await;
        }

        let presence_type = status.as_str();

        let node = NodeBuilder::new("presence")
            .attr("type", presence_type)
            .attr("name", &device_snapshot.push_name)
            .build();

        debug!(
            "Sending presence stanza: <presence type=\"{}\" name=\"{}\"/>",
            presence_type,
            node.attrs
                .get("name")
                .map(|s| s.as_str())
                .as_deref()
                .unwrap_or("")
        );

        self.client
            .send_node(node)
            .await
            .map_err(|e| PresenceError::Other(anyhow::Error::from(e)))
    }

    /// Set presence to available (online).
    pub async fn set_available(&self) -> Result<(), PresenceError> {
        self.set(PresenceStatus::Available).await
    }

    /// Set presence to unavailable (offline).
    pub async fn set_unavailable(&self) -> Result<(), PresenceError> {
        self.set(PresenceStatus::Unavailable).await
    }

    /// Subscribe to a contact's presence updates.
    ///
    /// Sends a `<presence type="subscribe">` stanza to the target JID.
    /// If a valid tctoken exists for the contact, it is included as a child node.
    ///
    /// ## Wire Format
    /// ```xml
    /// <presence type="subscribe" to="user@s.whatsapp.net">
    ///   <tctoken><!-- raw token bytes --></tctoken>
    /// </presence>
    /// ```
    pub async fn subscribe(&self, jid: &Jid) -> Result<(), anyhow::Error> {
        debug!("presence subscribe: subscribing to {}", jid);
        let node = self.build_subscription_node(jid).await;
        self.client
            .send_node(node)
            .await
            .map_err(anyhow::Error::from)?;
        self.client.track_presence_subscription(jid.clone()).await;
        Ok(())
    }

    /// Unsubscribe from a contact's presence updates.
    ///
    /// Sends a `<presence type="unsubscribe">` stanza to the target JID.
    ///
    /// ## Wire Format
    /// ```xml
    /// <presence type="unsubscribe" to="user@s.whatsapp.net"/>
    /// ```
    pub async fn unsubscribe(&self, jid: &Jid) -> Result<(), anyhow::Error> {
        debug!("presence unsubscribe: unsubscribing from {}", jid);
        let node = self.build_unsubscription_node(jid);
        self.client
            .send_node(node)
            .await
            .map_err(anyhow::Error::from)?;
        self.client.untrack_presence_subscription(jid).await;
        Ok(())
    }
}

impl Client {
    pub(crate) async fn track_presence_subscription(&self, jid: Jid) {
        self.presence_subscriptions.lock().await.insert(jid);
    }

    pub(crate) async fn untrack_presence_subscription(&self, jid: &Jid) {
        self.presence_subscriptions.lock().await.remove(jid);
    }

    pub(crate) async fn tracked_presence_subscriptions(&self) -> Vec<Jid> {
        self.presence_subscriptions
            .lock()
            .await
            .iter()
            .cloned()
            .collect()
    }

    pub(crate) async fn resubscribe_presence_subscriptions(&self, expected_generation: u64) {
        let subscribed_jids = self.tracked_presence_subscriptions().await;
        if subscribed_jids.is_empty() {
            return;
        }

        debug!(
            "Re-subscribing to {} tracked presence subscriptions",
            subscribed_jids.len()
        );

        for jid in subscribed_jids {
            if self
                .connection_generation
                .load(std::sync::atomic::Ordering::SeqCst)
                != expected_generation
            {
                debug!("Stopping presence re-subscribe: connection generation changed");
                return;
            }

            if !self.is_connected() {
                debug!("Stopping presence re-subscribe: connection closed");
                return;
            }

            // Check membership before re-subscribing — a concurrent unsubscribe()
            // call may have removed this JID while we were iterating.
            if !self.presence_subscriptions.lock().await.contains(&jid) {
                debug!("Skipping re-subscribe for {jid}: unsubscribed during iteration");
                continue;
            }

            if let Err(err) = self.presence().subscribe(&jid).await {
                warn!("Failed to re-subscribe to presence for {jid}: {err:?}");
            }
        }
    }

    /// Access presence operations.
    #[allow(clippy::wrong_self_convention)]
    pub fn presence(&self) -> Presence<'_> {
        Presence::new(self)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::TokioRuntime;
    use crate::bot::Bot;
    use crate::http::{HttpClient, HttpRequest, HttpResponse};
    use crate::store::SqliteStore;
    use crate::store::commands::DeviceCommand;
    use anyhow::Result;
    use std::str::FromStr;
    use std::sync::Arc;
    use wacore::store::traits::Backend;
    use whatsapp_rust_tokio_transport::TokioWebSocketTransportFactory;

    // Mock HTTP client for testing
    #[derive(Debug, Clone)]
    struct MockHttpClient;

    #[async_trait::async_trait]
    impl HttpClient for MockHttpClient {
        async fn execute(&self, _request: HttpRequest) -> Result<HttpResponse> {
            Ok(HttpResponse {
                status_code: 200,
                body: br#"self.__swData=JSON.parse(/*BTDS*/"{\"dynamic_data\":{\"SiteData\":{\"server_revision\":1026131876,\"client_revision\":1026131876}}}");"#.to_vec(),
            })
        }
    }

    async fn create_test_backend() -> Arc<dyn Backend> {
        let temp_db = format!(
            "file:memdb_presence_{}?mode=memory&cache=shared",
            uuid::Uuid::new_v4()
        );
        Arc::new(
            SqliteStore::new(&temp_db)
                .await
                .expect("Failed to create test SqliteStore"),
        ) as Arc<dyn Backend>
    }

    /// Verifies WhatsApp Web behavior: presence deferred until pushname available.
    #[tokio::test]
    async fn test_presence_rejected_when_pushname_empty() {
        let backend = create_test_backend().await;
        let transport = TokioWebSocketTransportFactory::new();

        let bot = Bot::builder()
            .with_backend(backend)
            .with_transport_factory(transport)
            .with_http_client(MockHttpClient)
            .with_runtime(TokioRuntime)
            .build()
            .await
            .expect("Failed to build bot");

        let client = bot.client();

        let snapshot = client.persistence_manager().get_device_snapshot().await;
        assert!(
            snapshot.push_name.is_empty(),
            "Pushname should be empty on fresh device"
        );

        let result = client.presence().set(PresenceStatus::Available).await;

        assert!(
            result.is_err(),
            "Presence should fail when pushname is empty"
        );
        assert!(
            matches!(result.unwrap_err(), PresenceError::PushNameEmpty),
            "Error should be PushNameEmpty"
        );
    }

    /// Simulates pushname arriving from app state sync (setting_pushName mutation).
    #[tokio::test]
    async fn test_presence_succeeds_after_pushname_set() {
        let backend = create_test_backend().await;
        let transport = TokioWebSocketTransportFactory::new();

        let bot = Bot::builder()
            .with_backend(backend)
            .with_transport_factory(transport)
            .with_http_client(MockHttpClient)
            .with_runtime(TokioRuntime)
            .build()
            .await
            .expect("Failed to build bot");

        let client = bot.client();

        client
            .persistence_manager()
            .process_command(DeviceCommand::SetPushName("Test User".to_string()))
            .await;

        let snapshot = client.persistence_manager().get_device_snapshot().await;
        assert_eq!(snapshot.push_name, "Test User");

        // Validation passes; error should be connection-related, not pushname
        let result = client.presence().set(PresenceStatus::Available).await;

        if let Err(e) = result {
            assert!(
                !matches!(e, PresenceError::PushNameEmpty),
                "Should not fail due to pushname, got: {}",
                e
            );
            assert!(
                matches!(e, PresenceError::Other(_)),
                "Expected connection error (Other), got: {}",
                e
            );
        }
    }

    /// Matches WAWebPushNameSync.js: fresh pairing -> app state sync -> presence.
    #[tokio::test]
    async fn test_pushname_presence_flow_matches_whatsapp_web() {
        let backend = create_test_backend().await;
        let transport = TokioWebSocketTransportFactory::new();

        let bot = Bot::builder()
            .with_backend(backend)
            .with_transport_factory(transport)
            .with_http_client(MockHttpClient)
            .with_runtime(TokioRuntime)
            .build()
            .await
            .expect("Failed to build bot");

        let client = bot.client();

        // Fresh device has empty pushname
        let snapshot = client.persistence_manager().get_device_snapshot().await;
        assert!(snapshot.push_name.is_empty());

        // Presence deferred when pushname empty
        let result = client.presence().set(PresenceStatus::Available).await;
        assert!(matches!(result, Err(PresenceError::PushNameEmpty)));

        // Pushname arrives via app state sync
        client
            .persistence_manager()
            .process_command(DeviceCommand::SetPushName("WhatsApp User".to_string()))
            .await;

        // Now presence validation passes
        let result = client.presence().set(PresenceStatus::Available).await;

        if let Err(e) = result {
            assert!(
                !matches!(e, PresenceError::PushNameEmpty),
                "Error should be connection-related: {}",
                e
            );
        }
    }

    #[tokio::test]
    async fn test_presence_subscription_tracking_is_deduplicated() {
        let backend = create_test_backend().await;
        let transport = TokioWebSocketTransportFactory::new();

        let bot = Bot::builder()
            .with_backend(backend)
            .with_transport_factory(transport)
            .with_http_client(MockHttpClient)
            .with_runtime(TokioRuntime)
            .build()
            .await
            .expect("Failed to build bot");

        let client = bot.client();
        let jid = Jid::from_str("1234567890@s.whatsapp.net").expect("valid jid");

        client.track_presence_subscription(jid.clone()).await;
        client.track_presence_subscription(jid.clone()).await;

        let tracked = client.tracked_presence_subscriptions().await;
        assert_eq!(tracked, vec![jid]);
    }

    #[tokio::test]
    async fn test_presence_unsubscription_removes_tracked_jid() {
        let backend = create_test_backend().await;
        let transport = TokioWebSocketTransportFactory::new();

        let bot = Bot::builder()
            .with_backend(backend)
            .with_transport_factory(transport)
            .with_http_client(MockHttpClient)
            .with_runtime(TokioRuntime)
            .build()
            .await
            .expect("Failed to build bot");

        let client = bot.client();
        let jid = Jid::from_str("1234567890@s.whatsapp.net").expect("valid jid");

        client.track_presence_subscription(jid.clone()).await;
        client.untrack_presence_subscription(&jid).await;

        assert!(
            client.tracked_presence_subscriptions().await.is_empty(),
            "unsubscribe tracking should remove the jid"
        );
    }

    #[tokio::test]
    async fn test_unsubscribe_builds_expected_presence_stanza() {
        let jid = Jid::from_str("1234567890@s.whatsapp.net").expect("valid jid");
        let backend = create_test_backend().await;
        let transport = TokioWebSocketTransportFactory::new();

        let bot = Bot::builder()
            .with_backend(backend)
            .with_transport_factory(transport)
            .with_http_client(MockHttpClient)
            .with_runtime(TokioRuntime)
            .build()
            .await
            .expect("Failed to build bot");

        let client = bot.client();
        let node = client.presence().build_unsubscription_node(&jid);

        assert_eq!(node.tag, "presence");
        assert!(node.attrs.get("type").is_some_and(|v| v == "unsubscribe"));
        assert_eq!(
            node.attrs.get("to").map(ToString::to_string),
            Some(jid.to_string())
        );
        assert!(
            node.content.is_none(),
            "unsubscribe stanza should not have children"
        );
    }
}