use crate::utils::lock::{MutexSafe, RwLockSafe};
use log::{debug, error, info};
use serde::{Deserialize, Serialize};
use std::sync::{
    atomic::{AtomicBool, Ordering},
    Arc, Mutex, RwLock,
};
use tokio::sync::Mutex as TokioMutex;
use tokio::time::{sleep, Duration};

use crate::jellyfin::JellyfinClient;
use crate::player::{PlayerController, QueueContext};

/// Playback mode - local device, remote session, or idle
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
#[serde(tag = "type", rename_all = "lowercase")]
pub enum PlaybackMode {
    Local,
    Remote { session_id: String },
    Idle,
}

/// Manages playback mode transfers between local and remote sessions
pub struct PlaybackModeManager {
    jellyfin_client: Arc<Mutex<Option<JellyfinClient>>>,
    player_controller: Arc<TokioMutex<PlayerController>>,
    current_mode: Arc<RwLock<PlaybackMode>>,
    is_transferring: Arc<AtomicBool>,
}

impl PlaybackModeManager {
    /// Create a new playback mode manager
    pub fn new(
        jellyfin_client: Arc<Mutex<Option<JellyfinClient>>>,
        player_controller: Arc<TokioMutex<PlayerController>>,
    ) -> Self {
        Self {
            jellyfin_client,
            player_controller,
            current_mode: Arc::new(RwLock::new(PlaybackMode::Idle)),
            is_transferring: Arc::new(AtomicBool::new(false)),
        }
    }

    /// Get current playback mode
    pub fn get_mode(&self) -> PlaybackMode {
        self.current_mode.read_safe().clone()
    }

    /// Set playback mode (internal use)
    pub fn set_mode(&self, mode: PlaybackMode) {
        log::info!("[PlaybackMode] Setting mode to: {:?}", mode);
        let mut current = self.current_mode.write_safe();
        *current = mode;
    }

    /// Check if currently transferring
    pub fn is_transferring(&self) -> bool {
        self.is_transferring.load(Ordering::Relaxed)
    }

    /// Send volume command to remote session
    /// Commands: "SetVolume", "VolumeUp", "VolumeDown"
    #[allow(dead_code)] // Called from Android JNI callback
    pub async fn send_remote_volume_command(&self, command: &str, volume: i32) -> Result<(), String> {
        log::info!("[PlaybackMode] send_remote_volume_command ENTERED: command={}, volume={}", command, volume);

        // Get the current session ID
        let session_id = match self.get_mode() {
            PlaybackMode::Remote { session_id } => session_id,
            _ => {
                log::warn!("[PlaybackMode] Ignoring remote volume command - not in remote mode");
                return Ok(());
            }
        };

        log::info!("[PlaybackMode] Current mode is Remote, session_id={}", session_id);

        // Get Jellyfin client
        let client = {
            log::info!("[PlaybackMode] Attempting to lock Jellyfin client...");
            let client_opt = self
                .jellyfin_client
                .lock()
                .map_err(|e| {
                    log::error!("[PlaybackMode] Failed to lock Jellyfin client: {}", e);
                    format!("Failed to lock Jellyfin client: {}", e)
                })?;

            log::info!("[PlaybackMode] Jellyfin client lock acquired");

            match client_opt.as_ref() {
                Some(c) => {
                    log::info!("[PlaybackMode] Jellyfin client is configured, cloning...");
                    c.clone()
                }
                None => {
                    log::error!("[PlaybackMode] Jellyfin client is NOT configured!");
                    return Err("Jellyfin client not configured".to_string());
                }
            }
        };

        log::info!("[PlaybackMode] About to call client.session_set_volume...");

        // Send the volume command
        log::info!("[PlaybackMode] Sending {} command to session {} (volume: {})", command, session_id, volume);
        let result = client.session_set_volume(session_id, volume).await;

        match &result {
            Ok(_) => log::info!("[PlaybackMode] session_set_volume returned Ok"),
            Err(e) => log::error!("[PlaybackMode] session_set_volume returned Err: {}", e),
        }

        result
    }

    /// Extract Jellyfin item IDs from queue items
    /// Returns (item_ids, adjusted_current_index)
    fn extract_jellyfin_ids(&self, items: &[crate::player::MediaItem], original_index: usize) -> Result<(Vec<String>, usize), String> {

        let mut jellyfin_ids: Vec<String> = Vec::new();
        let mut adjusted_index: Option<usize> = None;
        let mut jellyfin_item_count = 0;

        for (i, item) in items.iter().enumerate() {
            if let Some(id) = item.jellyfin_id() {
                jellyfin_ids.push(id.to_string());

                // If this is the currently playing item, record its new index
                if i == original_index {
                    adjusted_index = Some(jellyfin_item_count);
                }

                jellyfin_item_count += 1;
            }
        }

        // Ensure the currently playing item has a Jellyfin ID
        let final_index = match adjusted_index {
            Some(idx) => idx,
            None => {
                log::warn!(
                    "[PlaybackMode] Currently playing item (index {}) does not have a Jellyfin ID",
                    original_index
                );
                return Err("Cannot transfer: currently playing item is not from Jellyfin".to_string());
            }
        };

        log::info!(
            "[PlaybackMode] Extracted {} Jellyfin IDs from queue (original index: {} -> adjusted: {})",
            jellyfin_ids.len(),
            original_index,
            final_index
        );

        Ok((jellyfin_ids, final_index))
    }

    /// Transfer playback from local device to remote Jellyfin session
    pub async fn transfer_to_remote(&self, session_id: String) -> Result<(), String> {
        debug!("[PlaybackMode] transfer_to_remote ENTERED");
        debug!("[PlaybackMode] session_id: {}", session_id);
        log::info!(
            "[PlaybackMode] Transferring to remote session: {}",
            session_id
        );

        // Set transferring flag
        debug!("[PlaybackMode] Setting is_transferring flag");
        self.is_transferring.store(true, Ordering::Relaxed);
        debug!("[PlaybackMode] Flag set, calling transfer_to_remote_inner");

        // Perform the transfer
        let result = self.transfer_to_remote_inner(&session_id).await;

        // Clear transferring flag
        self.is_transferring.store(false, Ordering::Relaxed);

        result
    }

    async fn transfer_to_remote_inner(&self, session_id: &str) -> Result<(), String> {
        log::info!("[PlaybackMode] transfer_to_remote_inner ENTERED");
        debug!("[PlaybackMode] transfer_to_remote_inner: session_id={}", session_id);

        // Get current player state and queue context
        let (queue_ids, current_index, position_seconds, queue_context) = {
            log::info!("[PlaybackMode] Acquiring player controller lock...");
            debug!("[PlaybackMode] Acquiring player controller lock...");
            let player = self.player_controller.lock().await;
            log::info!("[PlaybackMode] Player controller lock acquired");
            debug!("[PlaybackMode] Player controller lock acquired");

            let queue_arc = player.queue();
            let queue = queue_arc.lock_safe();
            let state = player.state();

            let original_index = queue.current_index().unwrap_or(0);
            let items = queue.items();

            log::info!("[PlaybackMode] Queue has {} items, original_index={}", items.len(), original_index);
            debug!("[PlaybackMode] Queue has {} items, original_index={}", items.len(), original_index);

            // Log each item's jellyfin_id for debugging
            for (i, item) in items.iter().enumerate() {
                let jf_id = item.jellyfin_id().unwrap_or("NONE");
                log::debug!("[PlaybackMode] Item {}: id={}, jellyfin_id={}", i, item.id, jf_id);
            }

            let (ids, adjusted_index) = self.extract_jellyfin_ids(items, original_index)?;
            let position = state.position().unwrap_or(0.0);
            let context = queue.context().clone();

            log::info!(
                "[PlaybackMode] Queue context: {:?}, {} items, current index: {}",
                context,
                ids.len(),
                adjusted_index
            );
            debug!(
                "[PlaybackMode] Extracted {} jellyfin IDs, adjusted_index={}, position={:.2}s",
                ids.len(),
                adjusted_index,
                position
            );

            (ids, adjusted_index, position, context)
        };

        // If queue is empty, just switch mode
        if queue_ids.is_empty() {
            log::info!("[PlaybackMode] Queue is empty, just switching mode");
            self.set_mode(PlaybackMode::Remote {
                session_id: session_id.to_string(),
            });
            return Ok(());
        }

        log::info!(
            "[PlaybackMode] Queue has {} items, current index: {}, position: {:.2}s",
            queue_ids.len(),
            current_index,
            position_seconds
        );

        // Get Jellyfin client for remote transfer
        log::info!("[PlaybackMode] Getting Jellyfin client for transfer...");
        debug!("[PlaybackMode] Getting Jellyfin client for transfer...");
        let client = {
            let client_opt = self
                .jellyfin_client
                .lock()
                .map_err(|e| {
                    log::error!("[PlaybackMode] Failed to lock Jellyfin client: {}", e);
                    error!("[PlaybackMode] Failed to lock Jellyfin client: {}", e);
                    format!("Failed to lock Jellyfin client: {}", e)
                })?;

            match client_opt.as_ref() {
                Some(c) => {
                    log::info!("[PlaybackMode] Jellyfin client is configured");
                    debug!("[PlaybackMode] Jellyfin client is configured");
                    c.clone()
                }
                None => {
                    log::error!("[PlaybackMode] Jellyfin client NOT configured!");
                    error!("[PlaybackMode] Jellyfin client NOT configured!");
                    return Err("Jellyfin client not configured".to_string());
                }
            }
        };

        // Calculate position in ticks
        let start_position_ticks = if position_seconds > 0.5 {
            Some((position_seconds * 10_000_000.0) as i64)
        } else {
            None
        };

        // Log queue context for debugging (context is tracked but we always send track IDs)
        match &queue_context {
            QueueContext::Album { album_id, album_name } => {
                log::info!(
                    "[PlaybackMode] Transferring album '{}' (ID: {}) with {} tracks to remote",
                    album_name,
                    album_id,
                    queue_ids.len()
                );
            }
            QueueContext::Playlist { playlist_id, playlist_name } => {
                log::info!(
                    "[PlaybackMode] Transferring playlist '{}' (ID: {}) with {} tracks to remote",
                    playlist_name,
                    playlist_id,
                    queue_ids.len()
                );
            }
            QueueContext::Custom => {
                log::info!(
                    "[PlaybackMode] Transferring custom queue with {} tracks to remote",
                    queue_ids.len()
                );
            }
        }

        // Always send individual track IDs - Jellyfin's play_on_session expects track IDs,
        // not album/playlist container IDs
        let expected_item_id = queue_ids
            .get(current_index)
            .cloned()
            .ok_or("Invalid start index")?;

        // Send play command to remote session with all track IDs
        log::info!(
            "[PlaybackMode] Sending play command to remote session: {} ({} tracks, starting at index {}, position: {:.2}s)",
            session_id,
            queue_ids.len(),
            current_index,
            position_seconds
        );
        debug!(
            "[PlaybackMode] Calling play_on_session: session={}, tracks={}, index={}, position_ticks={:?}",
            session_id,
            queue_ids.len(),
            current_index,
            start_position_ticks
        );

        // Log first few track IDs for debugging
        if queue_ids.len() > 0 {
            let preview: Vec<&str> = queue_ids.iter().take(3).map(|s| s.as_str()).collect();
            debug!("[PlaybackMode] First track IDs: {:?}...", preview);
        }

        client
            .play_on_session(
                session_id.to_string(),
                queue_ids.clone(),
                current_index,
                start_position_ticks,
            )
            .await
            .map_err(|e| {
                log::error!("[PlaybackMode] Failed to send play command: {}", e);
                error!("[PlaybackMode] Failed to send play command: {}", e);
                format!("Failed to start playback on remote session: {}", e)
            })?;

        log::info!("[PlaybackMode] Play command sent successfully");
        info!("[PlaybackMode] Play command sent successfully to remote session");

        // Wait for remote session to load the track (poll with timeout)
        log::info!("[PlaybackMode] Waiting for remote session to load track...");

        let mut attempts = 0;
        let max_attempts = 50; // 5 seconds max (50 * 100ms)
        let mut track_loaded = false;

        while attempts < max_attempts {
            sleep(Duration::from_millis(100)).await;
            attempts += 1;

            match client.get_session(session_id).await {
                Ok(Some(session)) => {
                    if let Some(now_playing) = &session.now_playing_item {
                        if now_playing.id.as_deref() == Some(&expected_item_id) {
                            log::info!(
                                "[PlaybackMode] Remote session loaded track '{}' after {}ms",
                                now_playing.name.as_deref().unwrap_or("Unknown"),
                                attempts * 100
                            );
                            track_loaded = true;
                            break;
                        }
                    }
                }
                Ok(None) => {
                    log::warn!("[PlaybackMode] Remote session not found while polling");
                    return Err("Remote session not found".to_string());
                }
                Err(e) => {
                    log::warn!("[PlaybackMode] Error polling session (attempt {}): {}", attempts, e);
                    // Continue polling - transient errors are OK
                }
            }
        }

        if !track_loaded {
            log::error!("[PlaybackMode] Timeout waiting for remote session to load track");
            return Err("Remote session did not load track in time".to_string());
        }

        // Stop local playback (queue should remain intact for remote session)
        log::info!("[PlaybackMode] Stopping local playback - queue should NOT be cleared");
        {
            let player = self.player_controller.lock().await;

            // Log queue state BEFORE stop
            {
                let queue_arc = player.queue();
                let queue = queue_arc.lock_safe();
                info!(
                    "[PlaybackMode] BEFORE STOP: Queue has {} items, current_index={:?}",
                    queue.items().len(),
                    queue.current_index()
                );
            }

            player.stop().map_err(|e| format!("Failed to stop playback: {}", e))?;

            // Log queue state AFTER stop (should be unchanged)
            {
                let queue_arc = player.queue();
                let queue = queue_arc.lock_safe();
                info!(
                    "[PlaybackMode] AFTER STOP: Queue has {} items, current_index={:?}",
                    queue.items().len(),
                    queue.current_index()
                );
            }
        }

        // Update mode to remote
        self.set_mode(PlaybackMode::Remote {
            session_id: session_id.to_string(),
        });

        // Enable remote volume control on Android (intercepts volume buttons)
        #[cfg(target_os = "android")]
        {
            if let Err(e) = crate::player::enable_remote_volume(50) {
                log::warn!("[PlaybackMode] Failed to enable remote volume: {}", e);
                // Non-fatal - continue with transfer
            }
        }

        log::info!("[PlaybackMode] Successfully transferred to remote");
        Ok(())
    }

    /// Transfer playback from remote session back to local device
    pub async fn transfer_to_local(
        &self,
        current_item_id: String,
        position_ticks: i64,
    ) -> Result<(), String> {
        log::info!("[PlaybackMode] Transferring to local playback");

        // Set transferring flag
        self.is_transferring.store(true, Ordering::Relaxed);

        // Perform the transfer
        let result = self
            .transfer_to_local_inner(&current_item_id, position_ticks)
            .await;

        // Clear transferring flag
        self.is_transferring.store(false, Ordering::Relaxed);

        result
    }

    async fn transfer_to_local_inner(
        &self,
        current_item_id: &str,
        position_ticks: i64,
    ) -> Result<(), String> {
        // Get current remote session info
        let session_id = match self.get_mode() {
            PlaybackMode::Remote { session_id } => session_id,
            _ => return Err("Not in remote playback mode".to_string()),
        };

        let position_seconds = position_ticks as f64 / 10_000_000.0;

        log::info!(
            "[PlaybackMode] Transfer to local: session={}, item_id={}, position={:.2}s",
            session_id,
            current_item_id,
            position_seconds
        );

        // Get Jellyfin client for stopping remote playback
        let client = {
            let client_opt = self
                .jellyfin_client
                .lock()
                .map_err(|e| format!("Failed to lock Jellyfin client: {}", e))?;

            client_opt
                .as_ref()
                .ok_or("Jellyfin client not configured")?
                .clone()
        };

        // Stop remote playback
        log::info!("[PlaybackMode] Stopping remote playback on session: {}", session_id);
        match client.send_session_command(session_id.clone(), "Stop").await {
            Ok(_) => log::info!("[PlaybackMode] Stop command sent successfully"),
            Err(e) => {
                log::warn!("[PlaybackMode] Failed to stop remote session (non-fatal): {}", e);
                // Don't fail the transfer if we can't stop the remote session
                // The user is already playing locally, so this is not critical
            }
        }

        // For now, we'll return an error indicating that the TypeScript side needs to handle
        // loading the media item, since we don't have access to the repository here yet.
        // This will be improved in Phase 3 when repository is migrated to Rust.
        log::debug!("[PlaybackMode] Cannot load media item in Rust yet - frontend handled it");

        // Update mode to local
        self.set_mode(PlaybackMode::Local);

        // Disable remote volume control on Android (return to system volume)
        #[cfg(target_os = "android")]
        {
            if let Err(e) = crate::player::disable_remote_volume() {
                log::warn!("[PlaybackMode] Failed to disable remote volume: {}", e);
                // Non-fatal - continue with transfer
            }
        }

        log::info!("[PlaybackMode] Successfully transferred to local");
        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    /// Test PlaybackMode enum serialization to JSON
    ///
    /// @req-test: DR-003 - Playback mode manager (Local/Remote/Idle states)
    /// @req-test: UR-010 - Control playback of Jellyfin remote sessions
    #[test]
    fn test_playback_mode_serialization() {
        let mode_idle = PlaybackMode::Idle;
        let json = serde_json::to_string(&mode_idle).unwrap();
        assert_eq!(json, r#"{"type":"idle"}"#);

        let mode_local = PlaybackMode::Local;
        let json = serde_json::to_string(&mode_local).unwrap();
        assert_eq!(json, r#"{"type":"local"}"#);

        let mode_remote = PlaybackMode::Remote {
            session_id: "abc123".to_string(),
        };
        let json = serde_json::to_string(&mode_remote).unwrap();
        assert!(json.contains(r#""type":"remote""#));
        assert!(json.contains(r#""session_id":"abc123""#));
    }

    /// Test PlaybackMode enum deserialization from JSON
    ///
    /// @req-test: DR-003 - Playback mode manager (Local/Remote/Idle states)
    #[test]
    fn test_playback_mode_deserialization() {
        let json = r#"{"type":"idle"}"#;
        let mode: PlaybackMode = serde_json::from_str(json).unwrap();
        assert_eq!(mode, PlaybackMode::Idle);

        let json = r#"{"type":"local"}"#;
        let mode: PlaybackMode = serde_json::from_str(json).unwrap();
        assert_eq!(mode, PlaybackMode::Local);

        let json = r#"{"type":"remote","session_id":"test_session"}"#;
        let mode: PlaybackMode = serde_json::from_str(json).unwrap();
        assert_eq!(
            mode,
            PlaybackMode::Remote {
                session_id: "test_session".to_string()
            }
        );
    }

    // Tests for extract_jellyfin_ids - verify all track IDs are sent to remote, not just album/playlist ID
    mod extract_jellyfin_ids_tests {
        use crate::player::{MediaItem, MediaSource, MediaType};
        use std::sync::{Arc, Mutex};
        use tokio::sync::Mutex as TokioMutex;

        fn create_test_item_with_jellyfin_id(id: &str, jellyfin_id: &str) -> MediaItem {
            MediaItem {
                id: id.to_string(),
                title: format!("Track {}", id),
                name: Some(format!("Track {}", id)),
                artist: Some("Test Artist".to_string()),
                album: Some("Test Album".to_string()),
                album_name: Some("Test Album".to_string()),
                album_id: Some("album_123".to_string()),
                artist_items: None,
                artists: Some(vec!["Test Artist".to_string()]),
                primary_image_tag: None,
                item_type: Some("Audio".to_string()),
                playlist_id: None,
                duration: Some(180.0),
                artwork_url: None,
                media_type: MediaType::Audio,
                source: MediaSource::Remote {
                    stream_url: format!("http://example.com/{}.mp3", id),
                    jellyfin_item_id: jellyfin_id.to_string(),
                },
                video_codec: None,
                needs_transcoding: false,
                video_width: None,
                video_height: None,
                subtitles: vec![],
                series_id: None,
                server_id: None,
            }
        }

        fn create_test_item_local(id: &str) -> MediaItem {
            MediaItem {
                id: id.to_string(),
                title: format!("Local Track {}", id),
                name: Some(format!("Local Track {}", id)),
                artist: Some("Test Artist".to_string()),
                album: None,
                album_name: None,
                album_id: None,
                artist_items: None,
                artists: Some(vec!["Test Artist".to_string()]),
                primary_image_tag: None,
                item_type: Some("Audio".to_string()),
                playlist_id: None,
                duration: Some(180.0),
                artwork_url: None,
                media_type: MediaType::Audio,
                source: MediaSource::DirectUrl {
                    url: format!("http://example.com/{}.mp3", id),
                },
                video_codec: None,
                needs_transcoding: false,
                video_width: None,
                video_height: None,
                subtitles: vec![],
                series_id: None,
                server_id: None,
            }
        }

        /// Test extracting all Jellyfin track IDs from album
        ///
        /// Verifies that all individual track IDs are extracted, not just the album ID.
        ///
        /// @req-test: UR-010 - Control playback of Jellyfin remote sessions
        /// @req-test: DR-003 - Playback mode manager (Jellyfin ID extraction)
        /// @req-test: IR-012 - Jellyfin Sessions API for remote playback control
        #[test]
        fn test_extract_all_jellyfin_ids_from_album() {
            // Simulate an album with 5 tracks - all should be extracted
            let items: Vec<MediaItem> = (1..=5)
                .map(|i| create_test_item_with_jellyfin_id(&format!("track_{}", i), &format!("jf_track_{}", i)))
                .collect();

            let manager = super::PlaybackModeManager::new(
                Arc::new(Mutex::new(None)),
                Arc::new(TokioMutex::new(crate::player::PlayerController::default())),
            );

            let result = manager.extract_jellyfin_ids(&items, 2);
            assert!(result.is_ok());

            let (ids, index) = result.unwrap();

            // All 5 track IDs should be extracted (not just the album ID)
            assert_eq!(ids.len(), 5, "All 5 track IDs should be extracted");
            assert_eq!(ids[0], "jf_track_1");
            assert_eq!(ids[1], "jf_track_2");
            assert_eq!(ids[2], "jf_track_3");
            assert_eq!(ids[3], "jf_track_4");
            assert_eq!(ids[4], "jf_track_5");

            // Index should point to track 3 (original index 2)
            assert_eq!(index, 2, "Current index should be preserved");
        }

        /// Test extracting Jellyfin IDs filters out local items
        ///
        /// @req-test: UR-010 - Control playback of remote sessions (local filtering)
        /// @req-test: DR-003 - Playback mode manager (local item filtering)
        #[test]
        fn test_extract_filters_local_items() {
            // Mix of Jellyfin and local items - only Jellyfin items should be extracted
            let items = vec![
                create_test_item_with_jellyfin_id("1", "jf_1"),
                create_test_item_local("2"),  // Local, no Jellyfin ID
                create_test_item_with_jellyfin_id("3", "jf_3"),
                create_test_item_with_jellyfin_id("4", "jf_4"),
            ];

            let manager = super::PlaybackModeManager::new(
                Arc::new(Mutex::new(None)),
                Arc::new(TokioMutex::new(crate::player::PlayerController::default())),
            );

            // Playing track 3 (index 2 in original, should become index 1 after filtering)
            let result = manager.extract_jellyfin_ids(&items, 2);
            assert!(result.is_ok());

            let (ids, index) = result.unwrap();

            // Only 3 Jellyfin tracks should be extracted
            assert_eq!(ids.len(), 3);
            assert_eq!(ids[0], "jf_1");
            assert_eq!(ids[1], "jf_3");
            assert_eq!(ids[2], "jf_4");

            // Index should be adjusted (track 3 is now at position 1)
            assert_eq!(index, 1);
        }

        /// Test extraction fails when current item is local
        ///
        /// @req-test: DR-003 - Playback mode manager (error handling)
        /// @req-test: UR-010 - Control playback of remote sessions (validation)
        #[test]
        fn test_extract_fails_when_current_item_is_local() {
            // Current item has no Jellyfin ID - should fail
            let items = vec![
                create_test_item_with_jellyfin_id("1", "jf_1"),
                create_test_item_local("2"),  // Local, no Jellyfin ID
                create_test_item_with_jellyfin_id("3", "jf_3"),
            ];

            let manager = super::PlaybackModeManager::new(
                Arc::new(Mutex::new(None)),
                Arc::new(TokioMutex::new(crate::player::PlayerController::default())),
            );

            // Playing the local track (index 1) should fail
            let result = manager.extract_jellyfin_ids(&items, 1);
            assert!(result.is_err());
            assert!(result.unwrap_err().contains("not from Jellyfin"));
        }

        /// Test extraction fails on empty queue
        ///
        /// @req-test: DR-003 - Playback mode manager (edge case: empty queue)
        #[test]
        fn test_extract_empty_queue() {
            let items: Vec<MediaItem> = vec![];

            let manager = super::PlaybackModeManager::new(
                Arc::new(Mutex::new(None)),
                Arc::new(TokioMutex::new(crate::player::PlayerController::default())),
            );

            let result = manager.extract_jellyfin_ids(&items, 0);
            assert!(result.is_err());
        }
    }
}