readful/lib/theme/app_theme.dart

import 'package:flutter/material.dart';

/// Readful应用主题配置
///
/// 提供完整的Material Design 3主题系统，包括：
/// - 亮色和暗色主题支持
/// - 自动跟随系统主题切换
/// - 统一的颜色方案和字体系统
/// - 专业的电子书阅读器配色
class AppTheme {
  /// 主题种子颜色
  ///
  /// 选择蓝绿色调(#0D7A7F)，原因：
  /// - 眼睛友好，适合长时间阅读
  /// - 专业且现代的视觉效果
  /// - 在亮色和暗色模式下都有良好对比度
  static const Color primarySeed = Color(0xFF0D7A7F);
  
  // 亮色主题
  static ThemeData lightTheme = ThemeData(
    useMaterial3: true,
    colorScheme: ColorScheme.fromSeed(
      seedColor: primarySeed,
      brightness: Brightness.light,
    ),
    // 文本主题配置
    textTheme: const TextTheme(
      headlineLarge: TextStyle(
        fontSize: 32,
        fontWeight: FontWeight.bold,
        letterSpacing: -0.5,
      ),
      headlineMedium: TextStyle(
        fontSize: 24,
        fontWeight: FontWeight.w600,
        letterSpacing: -0.25,
      ),
      bodyLarge: TextStyle(
        fontSize: 16,
        fontWeight: FontWeight.normal,
        letterSpacing: 0.1,
      ),
      bodyMedium: TextStyle(
        fontSize: 14,
        fontWeight: FontWeight.normal,
        letterSpacing: 0.25,
      ),
    ),
    // AppBar主题
    appBarTheme: const AppBarTheme(
      centerTitle: true,
      elevation: 0,
      scrolledUnderElevation: 1,
    ),
    // Card主题
    cardTheme: const CardTheme(
      elevation: 2,
      margin: EdgeInsets.symmetric(horizontal: 16, vertical: 8),
    ),
    // 底部导航栏主题
    bottomNavigationBarTheme: const BottomNavigationBarThemeData(
      selectedItemColor: Color(0xFF0D7A7F), // 主题色
      unselectedItemColor: Colors.grey,
      type: BottomNavigationBarType.fixed,
    ),
  );

  // 暗色主题
  static ThemeData darkTheme = ThemeData(
    useMaterial3: true,
    colorScheme: ColorScheme.fromSeed(
      seedColor: primarySeed,
      brightness: Brightness.dark,
    ),
    // 文本主题配置（暗色模式下的字体配置）
    textTheme: const TextTheme(
      headlineLarge: TextStyle(
        fontSize: 32,
        fontWeight: FontWeight.bold,
        letterSpacing: -0.5,
        color: Colors.white,
      ),
      headlineMedium: TextStyle(
        fontSize: 24,
        fontWeight: FontWeight.w600,
        letterSpacing: -0.25,
        color: Colors.white,
      ),
      bodyLarge: TextStyle(
        fontSize: 16,
        fontWeight: FontWeight.normal,
        letterSpacing: 0.1,
        color: Colors.white70,
      ),
      bodyMedium: TextStyle(
        fontSize: 14,
        fontWeight: FontWeight.normal,
        letterSpacing: 0.25,
        color: Colors.white70,
      ),
    ),
    // AppBar主题（暗色模式）
    appBarTheme: const AppBarTheme(
      centerTitle: true,
      elevation: 0,
      scrolledUnderElevation: 1,
    ),
    // Card主题（暗色模式）
    cardTheme: const CardTheme(
      elevation: 2,
      margin: EdgeInsets.symmetric(horizontal: 16, vertical: 8),
    ),
    // 底部导航栏主题（暗色模式）
    bottomNavigationBarTheme: const BottomNavigationBarThemeData(
      selectedItemColor: Color(0xFF4DD0E1), // 暗色模式下的亮色版本
      unselectedItemColor: Colors.grey,
      type: BottomNavigationBarType.fixed,
    ),
  );

  /// 获取系统当前的主题模式
  static Brightness getCurrentBrightness(BuildContext context) {
    return MediaQuery.of(context).platformBrightness;
  }

  /// 根据系统返回对应的主题
  static ThemeData getSystemTheme(BuildContext context) {
    return getCurrentBrightness(context) == Brightness.dark
        ? darkTheme
        : lightTheme;
  }
}