import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter/foundation.dart';
import '../core/constants/app_constants.dart';
import '../core/theme/app_theme.dart';
import '../core/utils/logger.dart';
import 'providers/share_provider.dart';
import 'widgets/share_test_widget.dart';

/// 主应用组件
/// 负责配置MaterialApp和全局设置
class AppWidget extends ConsumerWidget {
  const AppWidget({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    Logger.debug('构建AppWidget');

    return MaterialApp(
      // 应用基础配置
      title: AppConstants.appName,
      debugShowCheckedModeBanner: false,
      
      // 主题配置
      theme: AppTheme.lightTheme,
      darkTheme: AppTheme.darkTheme,
      themeMode: ThemeMode.system,
      
      // 本地化配置
      localizationsDelegates: const [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      supportedLocales: const [
        Locale('zh', 'CN'), // 简体中文
        Locale('zh', 'TW'), // 繁体中文  
        Locale('en', 'US'), // English
      ],
      
      // 主页配置
      home: const AppHomePage(),
      
      // 导航观察者
      navigatorObservers: [
        _AppNavigatorObserver(),
      ],
      
      // 构建器配置（用于全局错误处理）
      builder: (context, child) {
        // 配置文字缩放因子，确保文字大小一致性
        final mediaQueryData = MediaQuery.of(context);
        final textScaler = MediaQuery.of(context).textScaler;
        final scaleFactor = textScaler.scale(1.0).clamp(0.8, 1.2);
        
        return MediaQuery(
          data: mediaQueryData.copyWith(
            textScaler: TextScaler.linear(scaleFactor),
          ),
          child: child ?? const SizedBox.shrink(),
        );
      },
      
      // 滚动行为配置
      scrollBehavior: const MaterialScrollBehavior().copyWith(
        physics: const ClampingScrollPhysics(),
      ),
    );
  }
}

/// 应用主页组件
/// 作为占位符，后续会替换为实际的主页
class AppHomePage extends ConsumerStatefulWidget {
  const AppHomePage({super.key});

  @override
  ConsumerState<AppHomePage> createState() => _AppHomePageState();
}

class _AppHomePageState extends ConsumerState<AppHomePage> {
  @override
  void initState() {
    super.initState();
    Logger.debug('AppHomePage初始化');

    // 初始化分享接收功能
    _initializeShareReceiving();
  }

  /// 初始化分享接收功能
  void _initializeShareReceiving() {
    try {
      Logger.info('开始初始化分享接收功能...');

      // 延迟执行，避免在widget构建期间修改provider
      Future.delayed(Duration.zero, () {
        // 获取分享提供者并初始化分享接收
        final shareNotifier = ref.read(shareProvider.notifier);
        shareNotifier.refreshShareStatus();
      });

      Logger.info('分享接收功能初始化完成');
    } catch (e) {
      Logger.error('初始化分享接收功能失败', error: e);
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    
    Logger.debug('构建AppHomePage');
    
    return Scaffold(
      appBar: AppBar(
        title: const Text('想拍'),
        centerTitle: true,
        elevation: 0,
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            // 应用Logo（占位符）
            Icon(
              Icons.photo_library,
              size: 120,
              color: theme.colorScheme.primary.withOpacity(0.8),
            ),
            const SizedBox(height: 32),
            
            // 欢迎文字
            Text(
              '欢迎使用想拍',
              style: theme.textTheme.headlineMedium?.copyWith(
                color: theme.colorScheme.onSurface,
                fontWeight: FontWeight.bold,
              ),
              textAlign: TextAlign.center,
            ),
            const SizedBox(height: 16),
            
            // 副标题
            Text(
              'Shoot What Inspires You',
              style: theme.textTheme.bodyLarge?.copyWith(
                color: theme.colorScheme.onSurface.withOpacity(0.7),
              ),
              textAlign: TextAlign.center,
            ),
            const SizedBox(height: 48),
            
            // 功能说明
            Text(
              '从其他应用分享图片到这里，\n开始收集你的灵感吧！',
              style: theme.textTheme.bodyMedium?.copyWith(
                color: theme.colorScheme.onSurface.withOpacity(0.6),
              ),
              textAlign: TextAlign.center,
            ),
            const SizedBox(height: 32),

            // 分享测试组件
            const ShareTestWidget(),
            const SizedBox(height: 32),
            
            // 开始使用按钮
            ElevatedButton.icon(
              onPressed: () {
                // TODO: 导航到图库页面
                Logger.debug('点击开始使用按钮');
              },
              icon: const Icon(Icons.arrow_forward),
              label: const Text('开始使用'),
              style: ElevatedButton.styleFrom(
                padding: const EdgeInsets.symmetric(horizontal: 32, vertical: 16),
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(25),
                ),
              ),
            ),
          ],
        ),
      ),
      
      // 底部导航栏（占位符）
      bottomNavigationBar: NavigationBar(
        destinations: const [
          NavigationDestination(
            icon: Icon(Icons.photo_library),
            label: '图库',
          ),
          NavigationDestination(
            icon: Icon(Icons.folder),
            label: '文件夹',
          ),
          NavigationDestination(
            icon: Icon(Icons.label),
            label: '标签',
          ),
          NavigationDestination(
            icon: Icon(Icons.settings),
            label: '设置',
          ),
        ],
        onDestinationSelected: (index) {
          Logger.debug('底部导航选择: $index');
          // TODO: 实现页面切换逻辑
        },
      ),
    );
  }
}

/// 导航观察者
/// 用于记录页面导航事件
class _AppNavigatorObserver extends NavigatorObserver {
  @override
  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
    if (route.settings.name != null) {
      Logger.debug('页面进入: ${route.settings.name}');
    }
  }

  @override
  void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
    if (route.settings.name != null) {
      Logger.debug('页面退出: ${route.settings.name}');
    }
  }

  @override
  void didRemove(Route<dynamic> route, Route<dynamic>? previousRoute) {
    if (route.settings.name != null) {
      Logger.debug('页面移除: ${route.settings.name}');
    }
  }

  @override
  void didReplace({Route<dynamic>? newRoute, Route<dynamic>? oldRoute}) {
    if (newRoute?.settings.name != null) {
      Logger.debug('页面替换: ${newRoute!.settings.name}');
    }
  }
}

/// 应用配置混入
mixin AppConfigMixin {
  /// 获取应用名称
  String get appName => AppConstants.appName;
  
  /// 获取应用版本
  String get appVersion => AppConstants.appVersion;
  
  /// 获取应用描述
  String get appDescription => AppConstants.appDescription;
  
  /// 检查是否为调试模式
  bool get isDebugMode => kDebugMode;
  
  /// 检查是否为发布模式
  bool get isReleaseMode => kReleaseMode;
  
  /// 获取当前时间戳
  int get currentTimestamp => DateTime.now().millisecondsSinceEpoch;
  
  /// 格式化文件大小
  String formatFileSize(int bytes) {
    if (bytes <= 0) return '0 B';
    
    const units = ['B', 'KB', 'MB', 'GB', 'TB'];
    int unitIndex = 0;
    double size = bytes.toDouble();
    
    while (size >= 1024 && unitIndex < units.length - 1) {
      size /= 1024;
      unitIndex++;
    }
    
    return '${size.toStringAsFixed(2)} ${units[unitIndex]}';
  }
  
  /// 格式化日期
  String formatDate(DateTime date) {
    return '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
  }
  
  /// 计算时间差（友好显示）
  String formatTimeDifference(DateTime from, DateTime to) {
    final difference = to.difference(from);
    
    if (difference.inDays > 0) {
      return '${difference.inDays}天前';
    } else if (difference.inHours > 0) {
      return '${difference.inHours}小时前';
    } else if (difference.inMinutes > 0) {
      return '${difference.inMinutes}分钟前';
    } else {
      return '刚刚';
    }
  }
}

/// 应用混入
/// 组合所有应用相关的混入
mixin AppMixin on AppConfigMixin, LoggerMixin {
  // 可以在这里添加更多通用的应用功能
}