import Foundation
import MediaKit

/// Ein Eintrag, wie Jellyfin ihn über die Leitung schickt.
///
/// Die Felder heißen groß und die Zeiten sind Ticks zu hundert Nanosekunden —
/// beides bleibt hier unten. Nach oben geht nur `MediaItem`.
public struct JellyfinItem: Decodable, Sendable {
    public let id: String
    public let name: String?
    public let type: String?
    public let overview: String?
    public let productionYear: Int?
    /// Laufzeit in Ticks zu 100 ns.
    public let runTimeTicks: Int64?
    public let indexNumber: Int?
    public let parentIndexNumber: Int?
    public let seriesName: String?
    public let seriesID: String?
    public let seasonID: String?
    public let seasonName: String?
    public let officialRating: String?
    public let communityRating: Double?
    public let criticRating: Double?
    public let dateCreated: Date?
    public let childCount: Int?
    public let recursiveItemCount: Int?
    public let genres: [String]?
    public let people: [Person]?
    public let userData: UserData?
    public let imageTags: [String: String]?
    public let backdropImageTags: [String]?
    public let parentBackdropItemID: String?
    public let seriesPrimaryImageTag: String?
    public let mediaSources: [JellyfinMediaSource]?
    public let collectionType: String?

    // MARK: - Live-TV
    //
    // Sender **und** Sendungen kommen bei Jellyfin als derselbe Typ wie
    // Filme und Folgen. Deshalb stehen ihre Felder hier und nicht in einem
    // eigenen Modell: ein zweites, das zu neunzig Prozent dasselbe trägt,
    // wäre eine Kopie mit Pflegeaufwand.

    /// Zu welchem Sender eine Sendung gehört.
    public let channelID: String?
    public let channelName: String?
    /// Der Folgentitel einer Sendung — der Reihentitel steht in `name`.
    public let episodeTitle: String?
    /// Die Nummer, unter der ein Sender im Programm steht — „3" oder „11.1".
    public let channelNumber: String?
    /// Dasselbe, aber am Sender selbst statt an der Sendung.
    public let number: String?
    public let startDate: Date?
    public let endDate: Date?
    /// Was auf diesem Sender gerade läuft.
    ///
    /// Kommt nur, wenn die Senderliste mit `addCurrentProgram` geholt wurde —
    /// dann aber gleich mit, und die Liste braucht keinen zweiten Aufruf.
    public let currentProgram: JellyfinCurrentProgram?
    /// Ob die Sendung zu einem laufenden Serien-Timer gehört.
    public let seriesTimerID: String?
    public let isMovie: Bool?
    public let isSeries: Bool?
    public let isNews: Bool?
    public let isSports: Bool?
    public let isKids: Bool?
    public let isLive: Bool?

    public struct Person: Decodable, Sendable {
        public let id: String?
        public let name: String?
        public let role: String?
        public let type: String?
        public let primaryImageTag: String?

        private enum CodingKeys: String, CodingKey {
            case id = "Id", name = "Name", role = "Role", type = "Type"
            case primaryImageTag = "PrimaryImageTag"
        }
    }

    public struct UserData: Decodable, Sendable {
        public let playbackPositionTicks: Int64?
        public let playCount: Int?
        public let played: Bool?
        public let isFavorite: Bool?
        public let unplayedItemCount: Int?

        private enum CodingKeys: String, CodingKey {
            case playbackPositionTicks = "PlaybackPositionTicks"
            case playCount = "PlayCount"
            case played = "Played"
            case isFavorite = "IsFavorite"
            case unplayedItemCount = "UnplayedItemCount"
        }
    }

    private enum CodingKeys: String, CodingKey {
        case id = "Id", name = "Name", type = "Type", overview = "Overview"
        case productionYear = "ProductionYear", runTimeTicks = "RunTimeTicks"
        case indexNumber = "IndexNumber", parentIndexNumber = "ParentIndexNumber"
        case seriesName = "SeriesName", seriesID = "SeriesId"
        case seasonID = "SeasonId", seasonName = "SeasonName"
        case officialRating = "OfficialRating", communityRating = "CommunityRating"
        case criticRating = "CriticRating", dateCreated = "DateCreated"
        case childCount = "ChildCount", recursiveItemCount = "RecursiveItemCount"
        case genres = "Genres", people = "People", userData = "UserData"
        case imageTags = "ImageTags", backdropImageTags = "BackdropImageTags"
        case parentBackdropItemID = "ParentBackdropItemId"
        case seriesPrimaryImageTag = "SeriesPrimaryImageTag"
        case mediaSources = "MediaSources", collectionType = "CollectionType"
        case channelID = "ChannelId", channelName = "ChannelName"
        case episodeTitle = "EpisodeTitle"
        case channelNumber = "ChannelNumber", number = "Number"
        case startDate = "StartDate", endDate = "EndDate"
        case currentProgram = "CurrentProgram", seriesTimerID = "SeriesTimerId"
        case isMovie = "IsMovie", isSeries = "IsSeries", isNews = "IsNews"
        case isSports = "IsSports", isKids = "IsKids", isLive = "IsLive"
    }
}

/// Was auf einem Sender gerade läuft.
///
/// Ein eigenes, schmales Modell statt eines verschachtelten `JellyfinItem`:
/// ein Struct darf sich nicht selbst enthalten — seine Größe wäre unendlich.
/// Gebraucht werden hier ohnehin nur fünf Felder.
public struct JellyfinCurrentProgram: Decodable, Sendable {
    public let id: String
    public let name: String?
    public let overview: String?
    public let startDate: Date?
    public let endDate: Date?

    private enum CodingKeys: String, CodingKey {
        case id = "Id", name = "Name", overview = "Overview"
        case startDate = "StartDate", endDate = "EndDate"
    }
}

/// Eine Fassung, wie Jellyfin sie meldet.
public struct JellyfinMediaSource: Decodable, Sendable {
    public let id: String?
    public let container: String?
    public let size: Int64?
    public let bitrate: Int?
    public let runTimeTicks: Int64?
    public let mediaStreams: [JellyfinMediaStream]?
    public let supportsDirectPlay: Bool?
    public let supportsDirectStream: Bool?
    public let supportsTranscoding: Bool?
    public let transcodingURL: String?

    private enum CodingKeys: String, CodingKey {
        case id = "Id", container = "Container", size = "Size", bitrate = "Bitrate"
        case runTimeTicks = "RunTimeTicks", mediaStreams = "MediaStreams"
        case supportsDirectPlay = "SupportsDirectPlay"
        case supportsDirectStream = "SupportsDirectStream"
        case supportsTranscoding = "SupportsTranscoding"
        case transcodingURL = "TranscodingUrl"
    }
}

/// Eine Spur, wie Jellyfin sie meldet.
public struct JellyfinMediaStream: Decodable, Sendable {
    public let index: Int?
    public let type: String?
    public let codec: String?
    public let language: String?
    public let displayTitle: String?
    public let channels: Int?
    public let isDefault: Bool?
    public let isForced: Bool?
    public let height: Int?
    public let width: Int?

    private enum CodingKeys: String, CodingKey {
        case index = "Index", type = "Type", codec = "Codec", language = "Language"
        case displayTitle = "DisplayTitle", channels = "Channels"
        case isDefault = "IsDefault", isForced = "IsForced"
        case height = "Height", width = "Width"
    }
}

/// Die Hülle, in der Jellyfin Listen schickt.
public struct JellyfinItemPage: Decodable, Sendable {
    public let items: [JellyfinItem]
    public let totalRecordCount: Int?
    public let startIndex: Int?

    private enum CodingKeys: String, CodingKey {
        case items = "Items"
        case totalRecordCount = "TotalRecordCount"
        case startIndex = "StartIndex"
    }
}

extension Int64 {
    /// Ticks zu hundert Nanosekunden in Millisekunden.
    ///
    /// Jellyfins Einheit. Zehntausend Ticks sind eine Millisekunde — eine
    /// Zahl, die man beim Lesen zweimal prüft und deshalb genau einmal
    /// aufschreibt.
    var millisecondsFromTicks: Int { Int(self / 10_000) }
}

extension Int {
    var ticksFromMilliseconds: Int64 { Int64(self) * 10_000 }
}