// lib/main.dart
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:media_kit/media_kit.dart';
import 'services/audio_service.dart';
import 'services/playback_service.dart';
import 'pages/home_page.dart';
import 'pages/player_page.dart';
import 'pages/playlist_page.dart';
import 'widgets/global_mini_player.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  bool initSuccess = false;
  String? initError;

  try {
    MediaKit.ensureInitialized();
    PlaybackService().init();
    initSuccess = true;
  } catch (e, stack) {
    initError = '初始化失败: $e';
    print('❌ $initError');
    print(stack);
  }

  runApp(
    ChangeNotifierProvider(
      create: (_) => AudioService(),
      child: QTPlayerApp(
        initSuccess: initSuccess,
        initError: initError,
      ),
    ),
  );
}

class QTPlayerApp extends StatefulWidget {
  final bool initSuccess;
  final String? initError;

  const QTPlayerApp({
    super.key,
    required this.initSuccess,
    required this.initError,
  });

  @override
  State<QTPlayerApp> createState() => _QTPlayerAppState();
}

class _QTPlayerAppState extends State<QTPlayerApp>
    with SingleTickerProviderStateMixin {
  bool _showPlayerPage = false;
  bool _showPlaylist = false;

  late final AnimationController _animationController;
  late final Animation<double> _slideAnimation;

  @override
  void initState() {
    super.initState();
    GlobalMiniPlayer.onOpenPlayerPage = _openPlayerPage;
    GlobalMiniPlayer.onOpenPlaylistPage = _openPlaylist;

    _animationController = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 300),
    );

    _slideAnimation = Tween<double>(begin: 1.0, end: 0.0).animate(
      CurvedAnimation(
        parent: _animationController,
        curve: Curves.easeOutCubic,
      ),
    );
  }

  @override
  void dispose() {
    _animationController.dispose();
    super.dispose();
  }

  void _openPlayerPage() {
    setState(() {
      _showPlayerPage = true;
      _showPlaylist = false;
    });
    _animationController.forward(from: 0.0);
  }

  void _closePlayerPage() {
    _animationController.reverse().then((_) {
      if (mounted) {
        setState(() {
          _showPlayerPage = false;
        });
      }
    });
  }

  void _openPlaylist() {
    setState(() {
      _showPlaylist = true;
    });
  }

  void _closePlaylist() {
    setState(() {
      _showPlaylist = false;
    });
  }

  // ============================================================
  // ✅ PopScope 的 onPopInvokedWithResult
  // ============================================================
  void _onPopInvokedWithResult(bool didPop, Object? result) {
    if (didPop) return;

    // 1️⃣ 优先关闭播放列表（最高层级）
    if (_showPlaylist) {
      _closePlaylist();
      return;
    }

    // 2️⃣ 其次关闭播放页
    if (_showPlayerPage) {
      _closePlayerPage();
      return;
    }

    // 3️⃣ 没有覆盖层，允许退出（由 Navigator 处理）
    // 注意：这里不能直接退出，需要让 Navigator 处理
    // 但 canPop 会根据状态返回 true/false
  }

  @override
  Widget build(BuildContext context) {
    if (!widget.initSuccess) {
      return MaterialApp(
        home: Scaffold(
          backgroundColor: const Color(0xFF0E1211),
          body: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Icon(Icons.error_outline, size: 64, color: Colors.red[300]),
                const SizedBox(height: 16),
                const Text(
                  '应用初始化失败',
                  style: TextStyle(color: Colors.white, fontSize: 20),
                ),
                const SizedBox(height: 8),
                Text(
                  widget.initError ?? '未知错误',
                  style: TextStyle(color: Colors.grey[400], fontSize: 14),
                  textAlign: TextAlign.center,
                ),
              ],
            ),
          ),
        ),
      );
    }

    return MaterialApp(
      title: '清听',
      theme: ThemeData(
        brightness: Brightness.dark,
        primaryColor: const Color(0xFF7C9A9E),
        colorScheme: const ColorScheme.dark(
          primary: Color(0xFF7C9A9E),
          secondary: Color(0xFFB8D4D0),
          surface: Color(0xFF1A1F1E),
          onSurface: Colors.white,
        ),
        useMaterial3: true,
      ),
      home: const HomePage(),
      builder: (context, child) {
        // ✅ 暴力测试：canPop 写死为 false
        return PopScope(
          canPop: false,
          onPopInvokedWithResult: (didPop, result) {
            debugPrint('🔥🔥🔥 BACK FIRED: didPop=$didPop');
            debugPrint('🔥 playlist=$_showPlaylist, player=$_showPlayerPage');

            if (_showPlaylist) {
              debugPrint('🔥 closing playlist');
              _closePlaylist();
            } else if (_showPlayerPage) {
              debugPrint('🔥 closing player');
              _closePlayerPage();
            } else {
              debugPrint('🔥 no overlay, allowing exit');
              // 注意：这里 canPop=false，需要手动退出
              // 用 SystemNavigator.pop() 或 Navigator.pop(context)
            }
          },
          child: Overlay(
            initialEntries: [
              OverlayEntry(
                builder: (context) => Stack(
                  children: [
                    Positioned.fill(child: child!),
                    const Positioned(
                      left: 0,
                      right: 0,
                      bottom: 0,
                      child: GlobalMiniPlayer(),
                    ),
                    if (_showPlayerPage)
                      Positioned.fill(
                        child: AnimatedBuilder(
                          animation: _animationController,
                          builder: (context, child) {
                            final progress = _slideAnimation.value;
                            final offsetY =
                                MediaQuery.of(context).size.height * progress;
                            return Transform.translate(
                              offset: Offset(0, offsetY),
                              child: Opacity(
                                opacity: 1.0 - progress * 0.3,
                                child: child,
                              ),
                            );
                          },
                          child: PlayerPage(
                            onClose: _closePlayerPage,
                            onOpenPlaylist: _openPlaylist,
                          ),
                        ),
                      ),
                    if (_showPlaylist)
                      Positioned.fill(
                        child: PlaylistPage(
                          onClose: _closePlaylist,
                        ),
                      ),
                  ],
                ),
              ),
            ],
          ),
        );
      },
    );
  }
}