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';

final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();

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';
    debugPrint('❌ $initError');
    debugPrint(stack.toString());
  }

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

// ═══════════════════════════════════════════════════
// RouteManager - 路由状态管理
// ═══════════════════════════════════════════════════
class RouteManager extends ChangeNotifier {
  static final RouteManager _instance = RouteManager._internal();
  factory RouteManager() => _instance;
  RouteManager._internal();

  String _currentRoute = '/';

  String get currentRoute => _currentRoute;

  bool get showMiniPlayer =>
      _currentRoute != '/player' && _currentRoute != '/playlist';

  void updateRoute(String route) {
    if (_currentRoute != route) {
      _currentRoute = route;
      debugPrint('📌 路由更新: $route');
      notifyListeners();
    }
  }
}

// ═══════════════════════════════════════════════════
// 导航观察者 - 监听路由变化
// ═══════════════════════════════════════════════════
class MiniPlayerNavigatorObserver extends NavigatorObserver {
  void _updateRoute(Route? route) {
    final name = route?.settings.name ?? '/';
    RouteManager().updateRoute(name);
  }

  @override
  void didPush(Route route, Route? previousRoute) {
    _updateRoute(route);
  }

  @override
  void didPop(Route route, Route? previousRoute) {
    // ⭐ 关键：用 previousRoute 而不是 navigatorKey.currentContext
    _updateRoute(previousRoute);
  }

  @override
  void didReplace({Route? newRoute, Route? oldRoute}) {
    _updateRoute(newRoute);
  }
}

// ═══════════════════════════════════════════════════
// 主应用
// ═══════════════════════════════════════════════════
class QTPlayerApp extends StatelessWidget {
  final bool initSuccess;
  final String? initError;

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

  @override
  Widget build(BuildContext context) {
    if (!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(
                  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,
      ),
      navigatorKey: navigatorKey,
      navigatorObservers: [MiniPlayerNavigatorObserver()],
      routes: {
        '/': (context) => const HomePage(),
        '/player': (context) => const PlayerPage(),
        '/playlist': (context) => const PlaylistPage(),
      },
      // ⭐ 核心改动：删除手写 Overlay，直接用 Stack
      builder: (context, child) {
        return Stack(
          fit: StackFit.expand,
          children: [
            // 1. Navigator（所有路由页面）
            if (child != null) child,

            // 2. MiniPlayer（由路由状态控制显隐）
            AnimatedBuilder(
              animation: RouteManager(),
              builder: (context, _) {
                if (!RouteManager().showMiniPlayer) {
                  return const SizedBox.shrink();
                }
                return const Align(
                  alignment: Alignment.bottomCenter,
                  child: GlobalMiniPlayer(),
                );
              },
            ),
          ],
        );
      },
    );
  }
}