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

class AppTheme {
  static ThemeData lightTheme = (() {
    // Color scheme for light theme
    const scheme = ColorScheme.light(
      primary: AppColors.primaryColor,
      onPrimary: Colors.white,
      secondary: AppColors.secondaryColor,
      tertiary: AppColors.infoColor,
      error: AppColors.errorColor,
      surface: AppColors.surfaceColor,
    );

    return ThemeData(
      useMaterial3: true,
      colorScheme: scheme,

      // 기본 배경색
      scaffoldBackgroundColor: AppColors.backgroundColor,

      // 카드 스타일 - Material 3 표면 중심
      cardTheme: CardThemeData(
        elevation: 1,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(16),
        ),
        margin: const EdgeInsets.symmetric(vertical: 8, horizontal: 16),
      ),

      // 앱바 스타일 - 기본 M3 사용(투명 배경 유지)
      appBarTheme: const AppBarTheme(
        backgroundColor: Colors.transparent,
        elevation: 0,
        centerTitle: false,
      ),

      // 타이포그래피 - Material 3 + onSurface 정렬
      textTheme: ThemeData.light(useMaterial3: true)
          .textTheme
          .copyWith(
            headlineLarge: const TextStyle(
              fontSize: 32,
              fontWeight: FontWeight.w700,
              letterSpacing: -0.5,
              height: 1.2,
            ),
            headlineMedium: const TextStyle(
              fontSize: 28,
              fontWeight: FontWeight.w700,
              letterSpacing: -0.5,
              height: 1.2,
            ),
            headlineSmall: const TextStyle(
              fontSize: 24,
              fontWeight: FontWeight.w600,
              letterSpacing: -0.25,
              height: 1.3,
            ),
            titleLarge: const TextStyle(
              fontSize: 20,
              fontWeight: FontWeight.w600,
              letterSpacing: -0.2,
              height: 1.4,
            ),
            titleMedium: const TextStyle(
              fontSize: 18,
              fontWeight: FontWeight.w600,
              letterSpacing: -0.1,
              height: 1.4,
            ),
            titleSmall: const TextStyle(
              fontSize: 16,
              fontWeight: FontWeight.w600,
              height: 1.4,
            ),
            bodyLarge: const TextStyle(
              fontSize: 16,
              fontWeight: FontWeight.w400,
              letterSpacing: 0.1,
              height: 1.5,
            ),
            bodyMedium: const TextStyle(
              fontSize: 14,
              fontWeight: FontWeight.w400,
              letterSpacing: 0.1,
              height: 1.5,
            ),
            bodySmall: const TextStyle(
              fontSize: 12,
              fontWeight: FontWeight.w400,
              letterSpacing: 0.2,
              height: 1.5,
            ),
            labelLarge: const TextStyle(
              fontSize: 14,
              fontWeight: FontWeight.w600,
              letterSpacing: 0.1,
              height: 1.4,
            ),
            labelMedium: const TextStyle(
              fontSize: 12,
              fontWeight: FontWeight.w600,
              letterSpacing: 0.2,
              height: 1.4,
            ),
            labelSmall: const TextStyle(
              fontSize: 11,
              fontWeight: FontWeight.w500,
              letterSpacing: 0.2,
              height: 1.4,
            ),
          )
          .apply(
            // 본문/헤드라인 공통 색상은 onSurface로 적용
            bodyColor: scheme.onSurface,
            displayColor: scheme.onSurface,
          ),

      // 입력 필드 스타일 - M3 surface/outline 기반
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: scheme.surface,
        contentPadding:
            const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: BorderSide.none,
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: BorderSide(color: scheme.outline, width: 1),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: BorderSide(color: scheme.primary, width: 1.5),
        ),
        errorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: BorderSide(color: scheme.error, width: 1),
        ),
        focusedErrorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: BorderSide(color: scheme.error, width: 1.5),
        ),
        labelStyle: TextStyle(
          color: scheme.onSurfaceVariant,
          fontSize: 14,
          fontWeight: FontWeight.w500,
        ),
        hintStyle: TextStyle(
          color: scheme.onSurfaceVariant,
          fontSize: 14,
          fontWeight: FontWeight.w400,
        ),
        errorStyle: TextStyle(
          color: scheme.error,
          fontSize: 12,
          fontWeight: FontWeight.w400,
        ),
      ),

      // 버튼 스타일 - 프라이머리 버튼
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          backgroundColor: scheme.primary,
          foregroundColor: scheme.onPrimary,
          minimumSize: const Size(0, 48),
          padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(12),
          ),
          elevation: 0,
        ),
      ),

      // 텍스트 버튼 스타일
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(
          foregroundColor: scheme.primary,
          minimumSize: const Size(0, 40),
          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(8),
          ),
          // Text style inherits from theme.labelLarge
        ),
      ),

      // 아웃라인 버튼 스타일
      outlinedButtonTheme: OutlinedButtonThemeData(
        style: OutlinedButton.styleFrom(
          foregroundColor: scheme.primary,
          minimumSize: const Size(0, 48),
          padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(12),
          ),
          side: BorderSide(color: scheme.outline, width: 1),
        ),
      ),

      // FAB 스타일
      floatingActionButtonTheme: FloatingActionButtonThemeData(
        backgroundColor: scheme.primary,
        foregroundColor: scheme.onPrimary,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(16),
        ),
        elevation: 2,
        extendedPadding:
            const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
        extendedTextStyle: const TextStyle(
          fontSize: 15,
          fontWeight: FontWeight.w600,
          letterSpacing: 0.1,
        ),
      ),

      // 스위치 스타일 (공통 테마)
      switchTheme: SwitchThemeData(
        thumbColor: WidgetStateProperty.resolveWith<Color>((states) {
          if (states.contains(WidgetState.selected)) {
            return scheme.primary;
          }
          return scheme.onSurfaceVariant; // OFF 썸을 명확하게
        }),
        trackColor: WidgetStateProperty.resolveWith<Color>((states) {
          if (states.contains(WidgetState.selected)) {
            return scheme.primary.withValues(alpha: 0.5);
          }
          // OFF 트랙 대비 강화
          return scheme.surfaceContainerHighest.withValues(alpha: 0.5);
        }),
      ),

      // 체크박스 스타일
      checkboxTheme: CheckboxThemeData(
        fillColor: WidgetStateProperty.resolveWith<Color>((states) {
          if (states.contains(WidgetState.selected)) {
            return scheme.primary;
          }
          return Colors.transparent;
        }),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(4),
        ),
        side: BorderSide(color: scheme.outline, width: 1.5),
      ),

      // 라디오 버튼 스타일
      radioTheme: RadioThemeData(
        fillColor: WidgetStateProperty.resolveWith<Color>((states) {
          if (states.contains(WidgetState.selected)) {
            return scheme.primary;
          }
          return scheme.onSurfaceVariant;
        }),
      ),

      // 슬라이더 스타일
      sliderTheme: SliderThemeData(
        activeTrackColor: scheme.primary,
        inactiveTrackColor: scheme.onSurfaceVariant,
        thumbColor: scheme.primary,
        overlayColor: scheme.primary.withValues(alpha: 0.3),
        trackHeight: 4,
        thumbShape: const RoundSliderThumbShape(enabledThumbRadius: 10),
        overlayShape: const RoundSliderOverlayShape(overlayRadius: 20),
      ),

      // 탭바 스타일
      tabBarTheme: TabBarThemeData(
        labelColor: scheme.primary,
        unselectedLabelColor: scheme.onSurfaceVariant,
        indicatorColor: scheme.primary,
        labelStyle: const TextStyle(
          fontSize: 14,
          fontWeight: FontWeight.w600,
          letterSpacing: 0.1,
        ),
        unselectedLabelStyle: const TextStyle(
          fontSize: 14,
          fontWeight: FontWeight.w500,
          letterSpacing: 0.1,
        ),
      ),

      // 디바이더 스타일
      dividerTheme: DividerThemeData(
        color: scheme.outline,
        thickness: 1,
        space: 16,
      ),

      // 페이지 트랜지션
      pageTransitionsTheme: const PageTransitionsTheme(
        builders: {
          TargetPlatform.android: ZoomPageTransitionsBuilder(),
          TargetPlatform.iOS: CupertinoPageTransitionsBuilder(),
          TargetPlatform.macOS: CupertinoPageTransitionsBuilder(),
        },
      ),

      // 스낵바 스타일 (기본 유지)
      snackBarTheme: SnackBarThemeData(
        backgroundColor: scheme.primary,
        contentTextStyle: TextStyle(
          color: scheme.onPrimary,
          fontSize: 14,
          fontWeight: FontWeight.w500,
        ),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(8),
        ),
        behavior: SnackBarBehavior.floating,
      ),
    );
  })();
}