import AppIntents

/// What a widget or control button asks the player to do. [MixRemote] carries it out: the app's version drives
/// the player, the widget extension's does nothing, since audio intents run in the app's process.
enum MixAction: Sendable {
    case cycle
    case nudge(String, Int)
    case mute(String)
    case playPause
}

struct CycleMixIntent: AudioPlaybackIntent {
    static let title: LocalizedStringResource = "Change Mix"
    static let description = IntentDescription("Moves to the next stem mix, in the order set in the Stem Editor.")

    init() {}

    func perform() async throws -> some IntentResult {
        await MixRemote.run(.cycle)
        return .result()
    }
}

struct NudgeStemIntent: AudioPlaybackIntent {
    static let title: LocalizedStringResource = "Turn a Stem Up or Down"
    static let isDiscoverable = false

    @Parameter(title: "Stem") var stem: String
    @Parameter(title: "Steps") var steps: Int

    init() {}
    init(stem: String, steps: Int) {
        self.stem = stem
        self.steps = steps
    }

    func perform() async throws -> some IntentResult {
        await MixRemote.run(.nudge(stem, steps))
        return .result()
    }
}

struct MuteStemIntent: AudioPlaybackIntent {
    static let title: LocalizedStringResource = "Mute or Unmute a Stem"
    static let isDiscoverable = false

    @Parameter(title: "Stem") var stem: String

    init() {}
    init(stem: String) { self.stem = stem }

    func perform() async throws -> some IntentResult {
        await MixRemote.run(.mute(stem))
        return .result()
    }
}

struct PlayPauseIntent: AudioPlaybackIntent {
    static let title: LocalizedStringResource = "Play or Pause"
    static let isDiscoverable = false

    init() {}

    func perform() async throws -> some IntentResult {
        await MixRemote.run(.playPause)
        return .result()
    }
}