pub mod device_profile;
pub mod hybrid;
pub mod offline;
pub mod online;
pub mod series_progress;
pub mod types;

pub use hybrid::HybridRepository;
pub use offline::OfflineRepository;
pub use online::{JRayActor, OnlineRepository};
pub use types::*;

use async_trait::async_trait;

/// Repository trait for media access (online, offline, or hybrid)
///
/// @req: UR-002 - Access media when online or offline
/// @req: UR-007 - Navigate media in library
/// @req: UR-008 - Search media across libraries
/// @req: IR-010 - Jellyfin API client for library browsing
/// @req: DR-012 - Local database for media metadata cache
/// @req: DR-013 - Repository pattern for online/offline data access
#[async_trait]
pub trait MediaRepository: Send + Sync {
    /// Get all libraries
    ///
    /// @req: UR-007 - Navigate media in library
    /// @req: JA-003 - Get user library views
    async fn get_libraries(&self) -> Result<Vec<Library>, RepoError>;

    /// Get items in a library or parent
    ///
    /// @req: UR-007 - Navigate media in library
    /// @req: JA-004 - Get library items (paginated)
    async fn get_items(
        &self,
        parent_id: &str,
        options: Option<GetItemsOptions>,
    ) -> Result<SearchResult, RepoError>;

    /// Get a single item by ID
    ///
    /// @req: UR-007 - Navigate media in library
    /// @req: JA-005 - Get item details and metadata
    async fn get_item(&self, item_id: &str) -> Result<MediaItem, RepoError>;

    /// Get latest items in a library
    ///
    /// @req: UR-024 - View recently added content on server
    /// @req: JA-016 - Get recently added items
    async fn get_latest_items(
        &self,
        parent_id: &str,
        limit: Option<usize>,
    ) -> Result<Vec<MediaItem>, RepoError>;

    /// Get resume items (continue watching/listening)
    ///
    /// @req: UR-019 - Resume playback from where you left off
    /// @req: UR-023 - View "Next Up" / Continue Watching on home screen
    /// @req: JA-015 - Get "Continue Watching" items
    async fn get_resume_items(
        &self,
        parent_id: Option<&str>,
        limit: Option<usize>,
    ) -> Result<Vec<MediaItem>, RepoError>;

    /// Get next up episodes
    ///
    /// @req: UR-023 - View "Next Up" / Continue Watching; auto-play next episode
    /// @req: JA-014 - Get "Next Up" items
    async fn get_next_up_episodes(
        &self,
        series_id: Option<&str>,
        limit: Option<usize>,
    ) -> Result<Vec<MediaItem>, RepoError>;

    /// Get recently played audio
    async fn get_recently_played_audio(
        &self,
        limit: Option<usize>,
    ) -> Result<Vec<MediaItem>, RepoError>;

    /// Get albums the user has played, but not recently ("rediscover" / haven't
    /// listened to in a while). Returns albums sorted by least-recently played
    /// first, optionally restricted to a parent library.
    async fn get_rediscover_albums(
        &self,
        parent_id: Option<&str>,
        limit: Option<usize>,
    ) -> Result<Vec<MediaItem>, RepoError>;

    /// Get resume movies
    async fn get_resume_movies(&self, limit: Option<usize>) -> Result<Vec<MediaItem>, RepoError>;

    /// Get genres
    async fn get_genres(&self, parent_id: Option<&str>) -> Result<Vec<Genre>, RepoError>;

    /// Search for items
    ///
    /// @req: UR-008 - Search media across libraries
    /// @req: JA-006 - Search across libraries
    async fn search(
        &self,
        query: &str,
        options: Option<SearchOptions>,
    ) -> Result<SearchResult, RepoError>;

    /// Get playback info for streaming
    ///
    /// @req: UR-003 - Play videos
    /// @req: UR-004 - Play audio uninterrupted
    /// @req: JA-007 - Get playback info and stream URL
    async fn get_playback_info(&self, item_id: &str) -> Result<PlaybackInfo, RepoError>;

    /// Get audio stream URL for a track
    ///
    /// @req: UR-004 - Play audio uninterrupted
    /// @req: JA-007 - Get playback info and stream URL
    async fn get_audio_stream_url(&self, item_id: &str) -> Result<String, RepoError>;

    /// Get an audio-only stream URL for a *video* item (background-audio handoff).
    ///
    /// Used when autoplay advances to the next episode while the app is playing a
    /// video in audio-only mode in the background: the backend needs the next
    /// episode's audio-only URL without any frontend round-trip. Online-only;
    /// offline/cache repositories return an error.
    ///
    /// TRACES: UR-040 | JA-032
    async fn get_audio_only_stream_url_for_video(
        &self,
        item_id: &str,
        media_source_id: Option<&str>,
        start_time_seconds: Option<f64>,
        audio_stream_index: Option<i32>,
    ) -> Result<String, RepoError>;

    /// Get Live TV channels (broadcast / IPTV) for browsing.
    async fn get_live_tv_channels(&self) -> Result<Vec<MediaItem>, RepoError>;

    /// Get the root list of plugin "Channels" (Jellyfin Channels feature).
    /// Drill-down into a channel reuses `get_items(channel_id, ...)`.
    async fn get_channels(&self) -> Result<SearchResult, RepoError>;

    /// Open a live stream (Live TV channel or live channel item) for playback.
    ///
    /// Returns the server transcoding URL plus identifiers needed to manage the
    /// stream. Required before a live channel can be played over HLS.
    async fn open_live_stream(&self, item_id: &str) -> Result<LiveStreamInfo, RepoError>;

    /// Report playback start
    ///
    /// @req: UR-025 - Sync watch history and progress back to Jellyfin
    /// @req: JA-010 - Report playback start
    async fn report_playback_start(
        &self,
        item_id: &str,
        position_ticks: i64,
    ) -> Result<(), RepoError>;

    /// Report playback progress
    ///
    /// @req: UR-025 - Sync watch history and progress back to Jellyfin
    /// @req: JA-011 - Report playback progress (periodic)
    async fn report_playback_progress(
        &self,
        item_id: &str,
        position_ticks: i64,
    ) -> Result<(), RepoError>;

    /// Report playback stopped
    ///
    /// @req: UR-025 - Sync watch history and progress back to Jellyfin
    /// @req: JA-012 - Report playback stopped
    async fn report_playback_stopped(
        &self,
        item_id: &str,
        position_ticks: i64,
    ) -> Result<(), RepoError>;

    /// Get image URL (synchronous - just constructs URL)
    fn get_image_url(
        &self,
        item_id: &str,
        image_type: ImageType,
        options: Option<ImageOptions>,
    ) -> String;

    /// Get subtitle URL (synchronous - just constructs URL)
    /// Called by frontend via Tauri invoke (getSubtitleUrl in VideoPlayer.svelte)
    #[allow(dead_code)]
    fn get_subtitle_url(
        &self,
        item_id: &str,
        media_source_id: &str,
        stream_index: i32,
        format: &str,
    ) -> String;

    /// Build the URL a video download is fetched from. Synchronous — it only
    /// constructs a URL, so it stays testable without a server. Reach it through
    /// [`resolve_video_download_url`] rather than calling it directly.
    ///
    /// `source_audio_codec` is the codec of the audio track the server would
    /// serve (see [`served_audio_codec`]); `None` when it is not known. At
    /// `original` quality it decides whether the file can be copied byte-for-byte
    /// or has to have its audio re-encoded on the way down — a downloaded file is
    /// played back with no server in reach, so it has to be decodable *here*.
    ///
    /// TRACES: UR-071 | DR-171
    #[allow(dead_code)]
    fn get_video_download_url(
        &self,
        item_id: &str,
        quality: &str,
        media_source_id: Option<&str>,
        source_audio_codec: Option<&str>,
    ) -> String;

    /// Mark item as favorite
    async fn mark_favorite(&self, item_id: &str) -> Result<(), RepoError>;

    /// Unmark item as favorite
    async fn unmark_favorite(&self, item_id: &str) -> Result<(), RepoError>;

    /// Everything the viewer has favourited, across every library.
    ///
    /// Separate from `get_items` because favourites span libraries and
    /// `get_items` is `ParentId`-shaped. `scope` is the opaque enum the
    /// frontend sends; this layer expands it to item types (DR-063) so no
    /// Jellyfin taxonomy is needed on the other side of the IPC boundary.
    ///
    /// TRACES: UR-067 | DR-115, JA-033 | UT-100, UT-101
    async fn get_favorites(
        &self,
        scope: SearchScope,
        options: Option<GetItemsOptions>,
    ) -> Result<SearchResult, RepoError>;

    /// Erase the viewer's watch history for an item: clear its played flag and
    /// its resume position. On a container (series, season) this applies to
    /// everything inside it, so a series is returned to "never watched" and
    /// reopens on its premiere.
    ///
    /// TRACES: UR-064 | DR-106
    async fn clear_watch_history(&self, item_id: &str) -> Result<(), RepoError>;

    /// Mark an item played — the inverse of `clear_watch_history`. Needed by the
    /// sync-queue drain, which replays `mark_played` rows queued while the
    /// server was unreachable; reporting a stop at a made-up position was the
    /// previous stand-in and does not set the played flag reliably.
    ///
    /// TRACES: UR-025 | DR-131 | JA-035
    async fn mark_played(&self, item_id: &str) -> Result<(), RepoError>;

    /// Get person details
    async fn get_person(&self, person_id: &str) -> Result<MediaItem, RepoError>;

    /// Get items by person (filmography)
    async fn get_items_by_person(
        &self,
        person_id: &str,
        options: Option<GetItemsOptions>,
    ) -> Result<SearchResult, RepoError>;

    /// Get similar/related items for a movie or show
    ///
    /// @req: UR-009 - Discover similar content based on current item
    async fn get_similar_items(
        &self,
        item_id: &str,
        limit: Option<usize>,
    ) -> Result<SearchResult, RepoError>;

    // ===== Playlist Methods =====

    /// Create a new playlist on the server
    ///
    /// @req: UR-014 - Make and edit playlists of music that sync back to Jellyfin
    /// @req: JA-019 - Get/create/update playlists
    async fn create_playlist(
        &self,
        name: &str,
        item_ids: &[String],
    ) -> Result<PlaylistCreatedResult, RepoError>;

    /// Delete a playlist
    ///
    /// @req: UR-014 - Make and edit playlists of music that sync back to Jellyfin
    /// @req: JA-019 - Get/create/update playlists
    async fn delete_playlist(&self, playlist_id: &str) -> Result<(), RepoError>;

    /// Rename a playlist
    ///
    /// @req: UR-014 - Make and edit playlists of music that sync back to Jellyfin
    /// @req: JA-019 - Get/create/update playlists
    async fn rename_playlist(&self, playlist_id: &str, name: &str) -> Result<(), RepoError>;

    /// Get playlist items with PlaylistItemId (needed for remove/reorder)
    ///
    /// @req: UR-014 - Make and edit playlists of music that sync back to Jellyfin
    /// @req: JA-019 - Get/create/update playlists
    async fn get_playlist_items(&self, playlist_id: &str) -> Result<Vec<PlaylistEntry>, RepoError>;

    /// Add items to a playlist
    ///
    /// @req: UR-014 - Make and edit playlists of music that sync back to Jellyfin
    /// @req: JA-020 - Add/remove items from playlist
    async fn add_to_playlist(
        &self,
        playlist_id: &str,
        item_ids: &[String],
    ) -> Result<(), RepoError>;

    /// Remove items from a playlist using entry IDs (PlaylistItemId, NOT media item IDs)
    ///
    /// @req: UR-014 - Make and edit playlists of music that sync back to Jellyfin
    /// @req: JA-020 - Add/remove items from playlist
    async fn remove_from_playlist(
        &self,
        playlist_id: &str,
        entry_ids: &[String],
    ) -> Result<(), RepoError>;

    /// Move a playlist item to a new position
    ///
    /// @req: UR-014 - Make and edit playlists of music that sync back to Jellyfin
    /// @req: JA-020 - Add/remove items from playlist
    async fn move_playlist_item(
        &self,
        playlist_id: &str,
        item_id: &str,
        new_index: u32,
    ) -> Result<(), RepoError>;
}

/// The audio codec the server would serve for `item_id` — the default track, or
/// the first when none is marked, matching the track Jellyfin picks.
///
/// `None` when the item has no audio, names no codec, or cannot be fetched. A
/// caller must read that as "unknown", never as "fine": it is the input to a
/// policy that only *adds* a transcode, so an unknown codec leaves behaviour
/// exactly as it was.
///
/// TRACES: UR-071 | DR-171 | UT-166
pub async fn served_audio_codec(repo: &dyn MediaRepository, item_id: &str) -> Option<String> {
    let item = repo.get_item(item_id).await.ok()?;
    let audio: Vec<(Option<&str>, bool)> = item
        .media_streams
        .as_deref()
        .unwrap_or_default()
        .iter()
        .filter(|s| s.stream_type == "Audio")
        .map(|s| (s.codec.as_deref(), s.is_default))
        .collect();

    device_profile::served_audio_codec(&audio).map(str::to_string)
}

/// Resolve the download URL for a video, applying the audio-codec policy that
/// keeps the saved file playable offline (DR-171).
///
/// Every video download goes through here rather than calling the builder
/// directly: the builder is pure and cannot look the codec up, and a caller that
/// forgets to is exactly how the silent downloads shipped.
///
/// TRACES: UR-071 | DR-171
pub async fn resolve_video_download_url(
    repo: &dyn MediaRepository,
    item_id: &str,
    quality: &str,
    media_source_id: Option<&str>,
) -> String {
    let codec = served_audio_codec(repo, item_id).await;
    repo.get_video_download_url(item_id, quality, media_source_id, codec.as_deref())
}
