import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

/// 应用主题配置类
class AppTheme {
  // 私有构造函数，防止实例化
  AppTheme._();

  /// 主题色彩配置
  static const Color primaryColor = Color(0xFF2196F3);
  static const Color secondaryColor = Color(0xFF03DAC6);
  static const Color backgroundColor = Color(0xFFF5F5F5);
  static const Color surfaceColor = Colors.white;
  static const Color errorColor = Color(0xFFB00020);
  
  /// 文字颜色
  static const Color textPrimary = Color(0xFF212121);
  static const Color textSecondary = Color(0xFF757575);
  static const Color textHint = Color(0xFFBDBDBD);
  
  /// 边框和分割线颜色
  static const Color dividerColor = Color(0xFFE0E0E0);
  static const Color borderColor = Color(0xFFCCCCCC);
  
  /// 浅色主题
  static ThemeData lightTheme = ThemeData(
    useMaterial3: true,
    brightness: Brightness.light,
    primaryColor: primaryColor,
    colorScheme: const ColorScheme.light(
      primary: primaryColor,
      secondary: secondaryColor,
      surface: surfaceColor,
      background: backgroundColor,
      error: errorColor,
      onPrimary: Colors.white,
      onSecondary: Colors.black,
      onSurface: textPrimary,
      onBackground: textPrimary,
      onError: Colors.white,
    ),
    
    // 应用栏主题
    appBarTheme: const AppBarTheme(
      backgroundColor: surfaceColor,
      foregroundColor: textPrimary,
      elevation: 0,
      centerTitle: true,
      systemOverlayStyle: SystemUiOverlayStyle(
        statusBarColor: Colors.transparent,
        statusBarIconBrightness: Brightness.dark,
        statusBarBrightness: Brightness.light,
      ),
    ),
    
    // 卡片主题
    cardTheme: CardTheme(
      elevation: 2,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(8.0),
      ),
      margin: const EdgeInsets.all(8.0),
    ),
    
    // 按钮主题
    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        elevation: 2,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(8.0),
        ),
        padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 12.0),
      ),
    ),
    
    // 输入框主题
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: Colors.grey[100],
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8.0),
        borderSide: const BorderSide(color: borderColor),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8.0),
        borderSide: const BorderSide(color: borderColor),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8.0),
        borderSide: const BorderSide(color: primaryColor, width: 2.0),
      ),
      contentPadding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 12.0),
    ),
    
    // 文字主题
    textTheme: const TextTheme(
      displayLarge: TextStyle(fontSize: 57.0, fontWeight: FontWeight.w400, color: textPrimary),
      displayMedium: TextStyle(fontSize: 45.0, fontWeight: FontWeight.w400, color: textPrimary),
      displaySmall: TextStyle(fontSize: 36.0, fontWeight: FontWeight.w400, color: textPrimary),
      headlineLarge: TextStyle(fontSize: 32.0, fontWeight: FontWeight.w400, color: textPrimary),
      headlineMedium: TextStyle(fontSize: 28.0, fontWeight: FontWeight.w400, color: textPrimary),
      headlineSmall: TextStyle(fontSize: 24.0, fontWeight: FontWeight.w400, color: textPrimary),
      titleLarge: TextStyle(fontSize: 22.0, fontWeight: FontWeight.w400, color: textPrimary),
      titleMedium: TextStyle(fontSize: 16.0, fontWeight: FontWeight.w500, color: textPrimary),
      titleSmall: TextStyle(fontSize: 14.0, fontWeight: FontWeight.w500, color: textPrimary),
      bodyLarge: TextStyle(fontSize: 16.0, fontWeight: FontWeight.w400, color: textPrimary),
      bodyMedium: TextStyle(fontSize: 14.0, fontWeight: FontWeight.w400, color: textPrimary),
      bodySmall: TextStyle(fontSize: 12.0, fontWeight: FontWeight.w400, color: textSecondary),
      labelLarge: TextStyle(fontSize: 14.0, fontWeight: FontWeight.w500, color: textPrimary),
      labelMedium: TextStyle(fontSize: 12.0, fontWeight: FontWeight.w500, color: textPrimary),
      labelSmall: TextStyle(fontSize: 11.0, fontWeight: FontWeight.w500, color: textPrimary),
    ),
    
    // 图标主题
    iconTheme: const IconThemeData(
      color: textSecondary,
      size: 24.0,
    ),
    
    // 分割线主题
    dividerTheme: const DividerThemeData(
      color: dividerColor,
      thickness: 1.0,
      space: 0,
    ),
  );

  /// 深色主题
  static ThemeData darkTheme = ThemeData(
    useMaterial3: true,
    brightness: Brightness.dark,
    primaryColor: primaryColor,
    colorScheme: const ColorScheme.dark(
      primary: primaryColor,
      secondary: secondaryColor,
      surface: Color(0xFF121212),
      background: Color(0xFF121212),
      error: errorColor,
      onPrimary: Colors.white,
      onSecondary: Colors.black,
      onSurface: Colors.white,
      onBackground: Colors.white,
      onError: Colors.white,
    ),
    
    // 应用栏主题（深色模式保持一定对比度）
    appBarTheme: const AppBarTheme(
      backgroundColor: Color(0xFF1E1E1E),
      foregroundColor: Colors.white,
      elevation: 0,
      centerTitle: true,
      systemOverlayStyle: SystemUiOverlayStyle(
        statusBarColor: Colors.transparent,
        statusBarIconBrightness: Brightness.light,
        statusBarBrightness: Brightness.dark,
      ),
    ),
    
    // 卡片主题
    cardTheme: CardTheme(
      elevation: 4,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(8.0),
      ),
      margin: const EdgeInsets.all(8.0),
      color: const Color(0xFF1E1E1E),
    ),
    
    // 按钮主题
    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        elevation: 2,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(8.0),
        ),
        padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 12.0),
        backgroundColor: primaryColor,
        foregroundColor: Colors.white,
      ),
    ),
    
    // 输入框主题
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: const Color(0xFF2C2C2C),
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8.0),
        borderSide: const BorderSide(color: Color(0xFF3C3C3C)),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8.0),
        borderSide: const BorderSide(color: Color(0xFF3C3C3C)),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8.0),
        borderSide: const BorderSide(color: primaryColor, width: 2.0),
      ),
      contentPadding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 12.0),
    ),
    
    // 文字主题（深色模式保持可读性）
    textTheme: const TextTheme(
      displayLarge: TextStyle(fontSize: 57.0, fontWeight: FontWeight.w400, color: Colors.white),
      displayMedium: TextStyle(fontSize: 45.0, fontWeight: FontWeight.w400, color: Colors.white),
      displaySmall: TextStyle(fontSize: 36.0, fontWeight: FontWeight.w400, color: Colors.white),
      headlineLarge: TextStyle(fontSize: 32.0, fontWeight: FontWeight.w400, color: Colors.white),
      headlineMedium: TextStyle(fontSize: 28.0, fontWeight: FontWeight.w400, color: Colors.white),
      headlineSmall: TextStyle(fontSize: 24.0, fontWeight: FontWeight.w400, color: Colors.white),
      titleLarge: TextStyle(fontSize: 22.0, fontWeight: FontWeight.w400, color: Colors.white),
      titleMedium: TextStyle(fontSize: 16.0, fontWeight: FontWeight.w500, color: Colors.white),
      titleSmall: TextStyle(fontSize: 14.0, fontWeight: FontWeight.w500, color: Colors.white),
      bodyLarge: TextStyle(fontSize: 16.0, fontWeight: FontWeight.w400, color: Colors.white),
      bodyMedium: TextStyle(fontSize: 14.0, fontWeight: FontWeight.w400, color: Colors.white),
      bodySmall: TextStyle(fontSize: 12.0, fontWeight: FontWeight.w400, color: Color(0xFFB0B0B0)),
      labelLarge: TextStyle(fontSize: 14.0, fontWeight: FontWeight.w500, color: Colors.white),
      labelMedium: TextStyle(fontSize: 12.0, fontWeight: FontWeight.w500, color: Colors.white),
      labelSmall: TextStyle(fontSize: 11.0, fontWeight: FontWeight.w500, color: Colors.white),
    ),
    
    // 图标主题
    iconTheme: const IconThemeData(
      color: Color(0xFFB0B0B0),
      size: 24.0,
    ),
    
    // 分割线主题
    dividerTheme: const DividerThemeData(
      color: Color(0xFF3C3C3C),
      thickness: 1.0,
      space: 0,
    ),
  );

  /// 获取主题模式对应的主题数据
  static ThemeData getTheme(Brightness brightness) {
    return brightness == Brightness.dark ? darkTheme : lightTheme;
  }

  /// 获取当前主题的对比色（用于保证可读性）
  static Color getContrastColor(Color backgroundColor) {
    // 计算颜色的亮度
    final brightness = backgroundColor.computeLuminance();
    // 亮度大于0.5使用深色，否则使用浅色
    return brightness > 0.5 ? Colors.black : Colors.white;
  }
}