import 'package:flutter/material.dart';

class AppTheme {
  AppTheme._(); // 私有构造，禁止实例化

  /// ======================
  /// 颜色体系（医疗风）
  /// ======================
  static const Color primaryColor = Color(0xFF00BFA5); // 绿为主
  static const Color secondaryColor = Color(0xFF2F7CF6); // 蓝为辅
  static const Color backgroundColor = Color(0xFFF6F8FA);
  static const Color surfaceColor = Colors.white;

  static const Color textPrimary = Color(0xFF1F2937);
  static const Color textSecondary = Color(0xFF6B7280);
  static const Color dividerColor = Color(0xFFE5E7EB);
  static const Color errorColor = Color(0xFFEF4444);

  /// ======================
  /// 亮色主题（默认）
  /// ======================
  static final ThemeData light = ThemeData(
    useMaterial3: true,

    /// 主色
    colorScheme: ColorScheme.light(
      primary: primaryColor,
      secondary: secondaryColor,
      background: backgroundColor,
      surface: surfaceColor,
      error: errorColor,
      onPrimary: Colors.white,
      onBackground: textPrimary,
    ),

    scaffoldBackgroundColor: backgroundColor,

    /// AppBar
    appBarTheme: const AppBarTheme(
      elevation: 0,
      backgroundColor: Colors.white,
      foregroundColor: textPrimary,
      centerTitle: false,
      titleTextStyle: TextStyle(
        fontSize: 18,
        fontWeight: FontWeight.w600,
        color: textPrimary,
      ),
    ),

    /// 字体
    textTheme: const TextTheme(
      headlineLarge: TextStyle(
        fontSize: 22,
        fontWeight: FontWeight.w600,
        color: textPrimary,
      ),
      bodyLarge: TextStyle(
        fontSize: 16,
        color: textPrimary,
      ),
      bodyMedium: TextStyle(
        fontSize: 14,
        color: textSecondary,
      ),
      labelLarge: TextStyle(
        fontSize: 14,
        fontWeight: FontWeight.w500,
        color: Colors.white,
      ),
    ),

    /// Divider
    dividerTheme: const DividerThemeData(
      color: dividerColor,
      thickness: 1,
      space: 1,
    ),

    /// Card（Pad 页面大量使用）
    cardTheme: CardThemeData(
      color: surfaceColor,
      elevation: 0,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(12),
      ),
    ),

    /// 按钮
    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        minimumSize: const Size(88, 44),
        backgroundColor: primaryColor,
        foregroundColor: Colors.white,
        textStyle: const TextStyle(
          fontSize: 14,
          fontWeight: FontWeight.w500,
        ),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(8),
        ),
      ),
    ),

    /// 输入框（病历 / 诊断高频）
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: Colors.white,
      contentPadding:
      const EdgeInsets.fromLTRB(12, 18, 12, 10),
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8),
        borderSide: const BorderSide(color: dividerColor),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8),
        borderSide: const BorderSide(color: dividerColor),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8),
        borderSide: const BorderSide(color: primaryColor, width: 1.5),
      ),
      errorBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8),
        borderSide: const BorderSide(color: errorColor),
      ),
    ),
  );

  /// ======================
  /// 暗色主题（预留）
  /// ======================
  static final ThemeData dark = ThemeData.dark(useMaterial3: true);
}