// Author: fruit.com.cn

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

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

/// K28-S 浅色暖橙主题。
abstract final class AppTheme {
  /// 页面顶部暖色到米白背景的渐变。
  static const LinearGradient pageGradient = LinearGradient(
    begin: Alignment.topCenter,
    end: Alignment.bottomCenter,
    colors: [AppColors.surfaceTop, AppColors.ink],
    stops: [0, 0.24],
  );

  /// 卡片轻阴影。
  static const BoxShadow cardShadow = BoxShadow(
    color: AppColors.cardShadow,
    blurRadius: AppDimens.cardShadowBlur,
    offset: Offset(0, AppDimens.cardShadowY),
  );

  /// 全局浅色暖橙主题。
  static ThemeData light() {
    const scheme = ColorScheme.light(
      primary: AppColors.blue,
      onPrimary: AppColors.onPrimary,
      secondary: AppColors.secondary,
      onSecondary: AppColors.onPrimary,
      primaryContainer: AppColors.surfaceTop,
      onPrimaryContainer: AppColors.onSurface,
      secondaryContainer: AppColors.badgePink,
      onSecondaryContainer: AppColors.badgePinkText,
      surface: AppColors.ink,
      onSurface: AppColors.onSurface,
      outline: AppColors.border,
      outlineVariant: AppColors.border,
      surfaceTint: AppColors.blue,
      inversePrimary: AppColors.bluePressed,
    );
    final base = ThemeData(
      useMaterial3: true,
      brightness: Brightness.light,
      colorScheme: scheme,
      scaffoldBackgroundColor: AppColors.ink,
      fontFamily: 'PlusJakartaSans',
      progressIndicatorTheme: const ProgressIndicatorThemeData(
        color: AppColors.blue,
      ),
      sliderTheme: const SliderThemeData(
        activeTrackColor: AppColors.blue,
        inactiveTrackColor: AppColors.border,
        thumbColor: AppColors.onPrimary,
      ),
      tabBarTheme: const TabBarThemeData(
        labelColor: AppColors.blue,
        indicatorColor: AppColors.blue,
        unselectedLabelColor: AppColors.muted,
      ),
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(foregroundColor: AppColors.blue),
      ),
      filledButtonTheme: FilledButtonThemeData(
        style: ButtonStyle(
          backgroundColor: WidgetStateProperty.resolveWith(_buttonColor),
          foregroundColor: const WidgetStatePropertyAll(AppColors.onPrimary),
          minimumSize: const WidgetStatePropertyAll(
            Size(0, AppDimens.buttonHeight),
          ),
          shape: const WidgetStatePropertyAll(StadiumBorder()),
        ),
      ),
      outlinedButtonTheme: OutlinedButtonThemeData(
        style: ButtonStyle(
          foregroundColor: const WidgetStatePropertyAll(AppColors.blue),
          minimumSize: const WidgetStatePropertyAll(
            Size(0, AppDimens.buttonHeight),
          ),
          side: const WidgetStatePropertyAll(
            BorderSide(color: AppColors.border),
          ),
          shape: const WidgetStatePropertyAll(StadiumBorder()),
        ),
      ),
      appBarTheme: const AppBarTheme(
        backgroundColor: AppColors.ink,
        foregroundColor: AppColors.onSurface,
        elevation: 0,
        systemOverlayStyle: SystemUiOverlayStyle.dark,
        titleTextStyle: TextStyle(
          color: AppColors.onSurface,
          fontFamily: 'Outfit',
          fontSize: AppDimens.pageTitle,
          fontWeight: FontWeight.w800,
        ),
      ),
      iconTheme: const IconThemeData(color: AppColors.onSurface),
      dividerTheme: const DividerThemeData(color: AppColors.border),
      cardTheme: const CardThemeData(
        color: AppColors.card,
        elevation: 0,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.all(Radius.circular(AppDimens.cardRadius)),
          side: BorderSide(color: AppColors.border),
        ),
      ),
      bottomSheetTheme: const BottomSheetThemeData(
        backgroundColor: Colors.transparent,
        modalBackgroundColor: Colors.transparent,
        surfaceTintColor: Colors.transparent,
      ),
      switchTheme: SwitchThemeData(
        thumbColor: WidgetStateProperty.resolveWith(
          (states) => states.contains(WidgetState.selected)
              ? AppColors.onPrimary
              : null,
        ),
        trackColor: WidgetStateProperty.resolveWith(
          (states) =>
              states.contains(WidgetState.selected) ? AppColors.blue : null,
        ),
      ),
      snackBarTheme: const SnackBarThemeData(
        backgroundColor: AppColors.onSurface,
        contentTextStyle: TextStyle(color: AppColors.onPrimary),
      ),
    );
    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),
        );
    return base.copyWith(textTheme: textTheme);
  }

  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.bluePressed;
    }
    return AppColors.blue;
  }
}