// Author: fruit.com.cn

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

import 'app_colors.dart';
import 'app_dimens.dart';

/// 深色视觉主题（默认且唯一）。
abstract final class AppTheme {
  /// 页面背景：顶部暖黑、底部纯黑，避免旧深蓝渐变。
  static const LinearGradient pageGradient = LinearGradient(
    begin: Alignment.topCenter,
    end: Alignment.bottomCenter,
    colors: [
      AppColors.mineGradientTop,
      AppColors.mineGradientMiddle,
      AppColors.mineGradientBottom,
    ],
    stops: [0, 0.4, 0.75],
  );

  /// 卡片阴影关闭，改用底色与分割线。
  static const BoxShadow cardShadow = BoxShadow(
    color: AppColors.cardShadow,
    blurRadius: AppDimens.cardShadowBlur,
    offset: Offset(0, AppDimens.cardShadowY),
  );

  static final BorderRadius _buttonRadius = BorderRadius.circular(
    AppDimens.buttonRadius,
  );
  static final BorderRadius _cardRadius = BorderRadius.circular(
    AppDimens.cardRadius,
  );
  static final BorderRadius _inputRadius = BorderRadius.circular(
    AppDimens.inputRadius,
  );

  /// 全局深色主题。
  static ThemeData dark() {
    const scheme = ColorScheme.dark(
      primary: AppColors.brandRed,
      onPrimary: AppColors.onPrimary,
      secondary: AppColors.secondary,
      onSecondary: AppColors.ink,
      primaryContainer: AppColors.raised,
      onPrimaryContainer: AppColors.onSurface,
      secondaryContainer: AppColors.badgePink,
      onSecondaryContainer: AppColors.badgePinkText,
      surface: AppColors.ink,
      onSurface: AppColors.onSurface,
      surfaceContainerHighest: AppColors.raised,
      outline: AppColors.border,
      outlineVariant: AppColors.border,
      surfaceTint: AppColors.transparent,
      inversePrimary: AppColors.brandRedPressed,
      error: AppColors.error,
      onError: AppColors.onPrimary,
    );
    final base = ThemeData(
      useMaterial3: true,
      brightness: Brightness.dark,
      colorScheme: scheme,
      scaffoldBackgroundColor: AppColors.ink,
      canvasColor: AppColors.ink,
      fontFamily: 'PlusJakartaSans',
      progressIndicatorTheme: const ProgressIndicatorThemeData(
        color: AppColors.brandRed,
      ),
      sliderTheme: const SliderThemeData(
        activeTrackColor: AppColors.brandRed,
        inactiveTrackColor: AppColors.border,
        thumbColor: AppColors.onPrimary,
      ),
      tabBarTheme: const TabBarThemeData(
        labelColor: AppColors.brandRed,
        indicatorColor: AppColors.brandRed,
        unselectedLabelColor: AppColors.muted,
      ),
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(
          foregroundColor: AppColors.primary,
          shape: RoundedRectangleBorder(borderRadius: _buttonRadius),
        ),
      ),
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ButtonStyle(
          backgroundColor: WidgetStateProperty.resolveWith(_buttonColor),
          foregroundColor: const WidgetStatePropertyAll(AppColors.onPrimary),
          elevation: const WidgetStatePropertyAll(0),
          minimumSize: const WidgetStatePropertyAll(
            Size(0, AppDimens.buttonHeight),
          ),
          shape: WidgetStatePropertyAll(
            RoundedRectangleBorder(borderRadius: _buttonRadius),
          ),
        ),
      ),
      filledButtonTheme: FilledButtonThemeData(
        style: ButtonStyle(
          backgroundColor: WidgetStateProperty.resolveWith(_buttonColor),
          foregroundColor: const WidgetStatePropertyAll(AppColors.onPrimary),
          minimumSize: const WidgetStatePropertyAll(
            Size(0, AppDimens.buttonHeight),
          ),
          shape: WidgetStatePropertyAll(
            RoundedRectangleBorder(borderRadius: _buttonRadius),
          ),
        ),
      ),
      outlinedButtonTheme: OutlinedButtonThemeData(
        style: ButtonStyle(
          foregroundColor: const WidgetStatePropertyAll(AppColors.textPrimary),
          minimumSize: const WidgetStatePropertyAll(
            Size(0, AppDimens.buttonHeight),
          ),
          side: const WidgetStatePropertyAll(
            BorderSide(color: AppColors.mineOutline),
          ),
          shape: WidgetStatePropertyAll(
            RoundedRectangleBorder(borderRadius: _buttonRadius),
          ),
        ),
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: AppColors.input,
        hintStyle: const TextStyle(color: AppColors.subtle),
        labelStyle: const TextStyle(color: AppColors.muted),
        border: OutlineInputBorder(
          borderRadius: _inputRadius,
          borderSide: const BorderSide(color: AppColors.border),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: _inputRadius,
          borderSide: const BorderSide(color: AppColors.border),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: _inputRadius,
          borderSide: const BorderSide(color: AppColors.brandRed),
        ),
      ),
      chipTheme: ChipThemeData(
        backgroundColor: AppColors.raised,
        selectedColor: AppColors.brandRed.withValues(alpha: 0.22),
        labelStyle: const TextStyle(color: AppColors.onSurface),
        secondaryLabelStyle: const TextStyle(color: AppColors.muted),
        side: const BorderSide(color: AppColors.border),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(AppDimens.chipRadius),
        ),
      ),
      appBarTheme: const AppBarTheme(
        backgroundColor: AppColors.transparent,
        foregroundColor: AppColors.textPrimary,
        elevation: 0,
        scrolledUnderElevation: 0,
        surfaceTintColor: AppColors.transparent,
        systemOverlayStyle: SystemUiOverlayStyle.light,
        titleTextStyle: TextStyle(
          color: AppColors.textPrimary,
          fontFamily: 'Outfit',
          fontSize: AppDimens.pageTitle,
          fontWeight: FontWeight.w800,
        ),
      ),
      iconTheme: const IconThemeData(color: AppColors.textPrimary),
      dividerTheme: const DividerThemeData(
        color: AppColors.border,
        thickness: 1,
        space: 1,
      ),
      cardTheme: CardThemeData(
        color: AppColors.card,
        elevation: 0,
        shadowColor: AppColors.transparent,
        surfaceTintColor: AppColors.transparent,
        shape: RoundedRectangleBorder(
          borderRadius: _cardRadius,
          side: const BorderSide(color: AppColors.border),
        ),
      ),
      dialogTheme: DialogThemeData(
        backgroundColor: AppColors.raised,
        surfaceTintColor: AppColors.transparent,
        shape: RoundedRectangleBorder(borderRadius: _cardRadius),
        titleTextStyle: const TextStyle(
          color: AppColors.onSurface,
          fontFamily: 'Outfit',
          fontSize: AppDimens.sectionTitle,
          fontWeight: FontWeight.w700,
        ),
        contentTextStyle: const TextStyle(
          color: AppColors.muted,
          fontSize: AppDimens.body,
        ),
      ),
      bottomNavigationBarTheme: const BottomNavigationBarThemeData(
        backgroundColor: AppColors.navBackground,
        selectedItemColor: AppColors.navSelected,
        unselectedItemColor: AppColors.navUnselected,
        elevation: 0,
        type: BottomNavigationBarType.fixed,
      ),
      bottomSheetTheme: const BottomSheetThemeData(
        backgroundColor: AppColors.transparent,
        modalBackgroundColor: AppColors.transparent,
        surfaceTintColor: AppColors.transparent,
      ),
      switchTheme: SwitchThemeData(
        thumbColor: WidgetStateProperty.resolveWith(
          (states) => states.contains(WidgetState.selected)
              ? AppColors.onPrimary
              : null,
        ),
        trackColor: WidgetStateProperty.resolveWith(
          (states) =>
              states.contains(WidgetState.selected) ? AppColors.brandRed : null,
        ),
      ),
      snackBarTheme: const SnackBarThemeData(
        backgroundColor: AppColors.raised,
        contentTextStyle: TextStyle(color: AppColors.onSurface),
        actionTextColor: AppColors.secondary,
      ),
      listTileTheme: const ListTileThemeData(
        iconColor: AppColors.onSurface,
        textColor: AppColors.onSurface,
      ),
    );
    final textTheme = base.textTheme
        .apply(
          fontFamily: 'PlusJakartaSans',
          bodyColor: AppColors.cream,
          displayColor: AppColors.onSurface,
        )
        .copyWith(
          displayLarge: _display(base.textTheme.displayLarge),
          displayMedium: _display(base.textTheme.displayMedium),
          displaySmall: _display(base.textTheme.displaySmall),
          headlineLarge: _display(base.textTheme.headlineLarge),
          headlineMedium: _display(base.textTheme.headlineMedium),
          headlineSmall: _display(base.textTheme.headlineSmall),
          titleLarge: _display(base.textTheme.titleLarge),
          bodyLarge: base.textTheme.bodyLarge?.copyWith(
            color: AppColors.onSurface,
          ),
          bodyMedium: base.textTheme.bodyMedium?.copyWith(
            color: AppColors.onSurface,
          ),
          bodySmall: base.textTheme.bodySmall?.copyWith(color: AppColors.muted),
          labelLarge: base.textTheme.labelLarge?.copyWith(
            color: AppColors.onSurface,
          ),
          labelMedium: base.textTheme.labelMedium?.copyWith(
            color: AppColors.muted,
          ),
          labelSmall: base.textTheme.labelSmall?.copyWith(
            color: AppColors.subtle,
          ),
        );
    return base.copyWith(textTheme: textTheme);
  }

  /// 兼容旧调用点，统一落到深色主题。
  static ThemeData light() => dark();

  static TextStyle? _display(TextStyle? style) =>
      style?.copyWith(fontFamily: 'Outfit', color: AppColors.onSurface);

  static Color _buttonColor(Set<WidgetState> states) {
    if (states.contains(WidgetState.pressed) ||
        states.contains(WidgetState.hovered) ||
        states.contains(WidgetState.focused)) {
      return AppColors.brandRedPressed;
    }
    return AppColors.brandRed;
  }
}