//
//  ServicesMALiveActivityManager.swift
//  Mobile Music Assistant
//

import ActivityKit
import Foundation
import MobileMAShared
import OSLog

private let logger = Logger(subsystem: "com.musicassistant.mobile", category: "LiveActivity")

/// Manages the Now Playing Live Activity lifecycle.
@Observable
final class MALiveActivityManager {

    private var currentActivity: Activity<MusicActivityAttributes>?

    init() {
        // End any orphaned activities left over from previous sessions or format changes.
        Task {
            for orphan in Activity<MusicActivityAttributes>.activities {
                await orphan.end(dismissalPolicy: .immediate)
            }
        }
    }

    // MARK: - Public Interface

    /// Start or update the Live Activity with current playback state.
    func update(trackTitle: String, artistName: String, artworkData: Data?, isPlaying: Bool, playerName: String) {
        let state = MusicActivityAttributes.ContentState(
            trackTitle: trackTitle,
            artistName: artistName,
            artworkData: artworkData,
            isPlaying: isPlaying,
            playerName: playerName
        )

        if let activity = currentActivity {
            Task {
                await activity.update(ActivityContent(state: state, staleDate: nil))
                logger.debug("Updated live activity: \(trackTitle)")
            }
        } else {
            start(state: state)
        }
    }

    /// End the Live Activity immediately.
    func end() {
        guard let activity = currentActivity else { return }
        currentActivity = nil
        Task {
            await activity.end(dismissalPolicy: .immediate)
            logger.debug("Ended live activity")
        }
    }

    // MARK: - Private

    private func start(state: MusicActivityAttributes.ContentState) {
        guard ActivityAuthorizationInfo().areActivitiesEnabled else {
            logger.info("Live Activities not enabled on this device")
            return
        }
        do {
            let activity = try Activity.request(
                attributes: MusicActivityAttributes(),
                content: ActivityContent(state: state, staleDate: nil)
            )
            currentActivity = activity
            logger.info("Started live activity: \(state.trackTitle)")
        } catch {
            logger.error("Failed to start live activity: \(error.localizedDescription)")
        }
    }
}