//
//  AppleMusicController.swift
//  DynamicIsland
//
//  Created by Alexander on 2025-03-29.
//

import Foundation
import Combine
import SwiftUI

class AppleMusicController: MediaControllerProtocol {
    // MARK: - Properties
    @Published private var playbackState: PlaybackState = PlaybackState(
        bundleIdentifier: "com.apple.Music",
        playbackRate: 1
    )
    
    var playbackStatePublisher: AnyPublisher<PlaybackState, Never> {
        $playbackState.eraseToAnyPublisher()
    }
    
    var isWorking: Bool {
        return true  // AppleMusic controller always works
    }
    
    private var notificationTask: Task<Void, Never>?
    
    // MARK: - Initialization
    init() {
        setupPlaybackStateChangeObserver()
        Task {
            if isActive() {
                await updatePlaybackInfo()
            }
        }
    }
    
    private func setupPlaybackStateChangeObserver() {
        notificationTask = Task { @Sendable [weak self] in
            let notifications = DistributedNotificationCenter.default().notifications(
                named: NSNotification.Name("com.apple.Music.playerInfo")
            )
            
            for await _ in notifications {
                await self?.updatePlaybackInfo()
            }
        }
    }
    
    deinit {
        notificationTask?.cancel()
    }
    
    // MARK: - Protocol Implementation
    func play() async {
        await executeCommand("play")
    }
    
    func pause() async {
        await executeCommand("pause")
    }
    
    func togglePlay() async {
        await executeCommand("playpause")
    }
    
    func nextTrack() async {
        await executeCommand("next track")
    }
    
    func previousTrack() async {
        await executeCommand("previous track")
    }
    
    func seek(to time: Double) async {
        await executeCommand("set player position to \(time)")
        await updatePlaybackInfo()
    }
    
    func toggleShuffle() async {
        await executeCommand("set shuffle enabled to not shuffle enabled")
        try? await Task.sleep(for: .milliseconds(150))
        await updatePlaybackInfo()
    }
    
    func toggleRepeat() async {
        await executeCommand("""
            if song repeat is off then
                set song repeat to all
            else if song repeat is all then
                set song repeat to one
            else
                set song repeat to off
            end if
            """)
        try? await Task.sleep(for: .milliseconds(150))
        await updatePlaybackInfo()
    }
    
    func isActive() -> Bool {
        let runningApps = NSWorkspace.shared.runningApplications
        return runningApps.contains { $0.bundleIdentifier == "com.apple.Music" }
    }
    
    func updatePlaybackInfo() async {
        guard let descriptor = try? await fetchPlaybackInfoAsync() else { return }
        guard descriptor.numberOfItems >= 8 else { return }
        var updatedState = self.playbackState
        
        updatedState.isPlaying = descriptor.atIndex(1)?.booleanValue ?? false
        updatedState.title = descriptor.atIndex(2)?.stringValue ?? "Unknown"
        updatedState.artist = descriptor.atIndex(3)?.stringValue ?? "Unknown"
        updatedState.album = descriptor.atIndex(4)?.stringValue ?? "Unknown"
        updatedState.currentTime = descriptor.atIndex(5)?.doubleValue ?? 0
        updatedState.duration = descriptor.atIndex(6)?.doubleValue ?? 0
        updatedState.isShuffled = descriptor.atIndex(7)?.booleanValue ?? false
        let repeatModeValue = descriptor.atIndex(8)?.int32Value ?? 0
        updatedState.repeatMode = RepeatMode(rawValue: Int(repeatModeValue)) ?? .off
        updatedState.artwork = descriptor.atIndex(9)?.data as Data?
        updatedState.lastUpdated = Date()
        self.playbackState = updatedState
    }
    
    // MARK: - Private Methods
    
    private func executeCommand(_ command: String) async {
        let script = "tell application \"Music\" to \(command)"
        try? await AppleScriptHelper.executeVoid(script)
    }
    
    private func fetchPlaybackInfoAsync() async throws -> NSAppleEventDescriptor? {
        let script = """
        tell application "Music"
            set isRunning to true
            try
                set playerState to player state is playing
                set currentTrackName to name of current track
                set currentTrackArtist to artist of current track
                set currentTrackAlbum to album of current track
                set trackPosition to player position
                set trackDuration to duration of current track
                set shuffleState to shuffle enabled
                set repeatState to song repeat
                if repeatState is off then
                    set repeatValue to 1
                else if repeatState is one then
                    set repeatValue to 2
                else if repeatState is all then
                    set repeatValue to 3
                end if

                try
                    set artData to data of artwork 1 of current track
                on error
                    set artData to ""
                end try
                return {playerState, currentTrackName, currentTrackArtist, currentTrackAlbum, trackPosition, trackDuration, shuffleState, repeatValue, artData}
            on error
                return {false, "Not Playing", "Unknown", "Unknown", 0, 0, false, 0, ""}
            end try
        end tell
        """
        
        return try await AppleScriptHelper.execute(script)
    }
}