import 'dart:io';

import 'package:flutter/material.dart';

class AppTheme {
  // 基础色值定义
  static const Color _pureWhite = Color(0xFFFFFFFF);
  static const Color _offWhite = Color(0xFFfafafc); // 稍微带点灰的白，用于背景增加层次感
  static const Color _pureBlack = Color(0xFF000000);
  static const Color _darkGrey = Color(0xFF1C1C1E); // iOS 风格的深灰黑色

  static ThemeData get lightTheme {
    return ThemeData(
      useMaterial3: true,
      brightness: Brightness.light,
      fontFamily: (Platform.isWindows) ? 'Microsoft YaHei' : null,

      // 1. 整体背景色
      scaffoldBackgroundColor: _offWhite,

      // 2. 核心颜色方案
      colorScheme: const ColorScheme.light(
        primary: _pureBlack, // 主色设为黑色
        onPrimary: _pureWhite, // 黑色背景上的文字设为白色
        surface: _pureWhite, // 卡片、弹窗等表面颜色
        onSurface: _pureBlack, // 表面上的文字色
        background: _offWhite,
      ),

      // 3. 全局按钮主题
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          backgroundColor: _pureBlack,
          foregroundColor: _pureWhite,
          elevation: 0,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(12),
          ),
          padding: const EdgeInsets.symmetric(vertical: 16, horizontal: 24),
        ),
      ),

      // 4. 填充按钮主题 (常用语 Material 3)
      filledButtonTheme: FilledButtonThemeData(
        style: FilledButton.styleFrom(
          backgroundColor: _pureBlack,
          foregroundColor: _pureWhite,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(12),
          ),
        ),
      ),

      // 5. AppBar 主题 (纯白背景，黑色文字)
      appBarTheme: const AppBarTheme(
        backgroundColor: _pureWhite,
        surfaceTintColor: Colors.transparent,
        elevation: 0,
        centerTitle: true,
        iconTheme: IconThemeData(color: _pureBlack),
        titleTextStyle: TextStyle(
          color: _pureBlack,
          fontSize: 18,
          fontWeight: FontWeight.w700,
          letterSpacing: -0.5,
        ),
      ),

      // 6. 输入框主题 (黑白简约)
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: _pureWhite,
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: const BorderSide(color: Colors.black12),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: const BorderSide(color: Colors.black12),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: const BorderSide(color: _pureBlack, width: 1.5),
        ),
      ),
    );
  }
}