import 'package:flutter/material.dart';

import 'app_colors.dart';

class AppTheme {
  static ThemeData dark() {
    const colorScheme = ColorScheme.dark(
      primary: AppColors.primary,
      secondary: AppColors.secondary,
      surface: AppColors.card,
      error: AppColors.error,
      onPrimary: Colors.white,
      onSecondary: Colors.white,
      onSurface: AppColors.textPrimary,
      onError: Colors.white,
    );

    final base = ThemeData(
      useMaterial3: true,
      brightness: Brightness.dark,
      colorScheme: colorScheme,
      scaffoldBackgroundColor: AppColors.background,
      canvasColor: AppColors.background,
      splashColor: AppColors.primary.withOpacity(0.12),
      highlightColor: AppColors.primary.withOpacity(0.08),
      dividerColor: AppColors.border,
      cardColor: AppColors.card,
      fontFamily: 'Noto Sans SC',
      textTheme: _textTheme,
      appBarTheme: const AppBarTheme(
        centerTitle: false,
        elevation: 0,
        backgroundColor: AppColors.background,
        foregroundColor: AppColors.textPrimary,
        titleTextStyle: TextStyle(
          fontSize: 20,
          fontWeight: FontWeight.w600,
          color: AppColors.textPrimary,
          fontFamily: 'Noto Sans SC',
          fontFamilyFallback: ['Inter'],
        ),
      ),
      cardTheme: CardThemeData(
        color: AppColors.card,
        elevation: 6,
        shadowColor: Colors.black.withOpacity(0.20),
        margin: EdgeInsets.zero,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(AppRadius.large),
          side: const BorderSide(color: AppColors.border),
        ),
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: AppColors.background,
        contentPadding: const EdgeInsets.symmetric(
          horizontal: 12,
          vertical: 12,
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppRadius.medium),
          borderSide: const BorderSide(color: AppColors.border),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppRadius.medium),
          borderSide: const BorderSide(color: AppColors.primary),
        ),
        hintStyle: const TextStyle(color: AppColors.textSecondary),
      ),
      navigationBarTheme: NavigationBarThemeData(
        backgroundColor: AppColors.card,
        height: 64,
        indicatorColor: AppColors.primary.withOpacity(0.18),
        labelTextStyle: WidgetStateProperty.all(
          const TextStyle(
            fontSize: 12,
            fontWeight: FontWeight.w500,
            fontFamily: 'Inter',
            fontFamilyFallback: ['Noto Sans SC'],
          ),
        ),
        iconTheme: WidgetStateProperty.resolveWith(
          (states) => IconThemeData(
            size: 24,
            color: states.contains(WidgetState.selected)
                ? AppColors.textPrimary
                : AppColors.textSecondary,
          ),
        ),
      ),
      filledButtonTheme: FilledButtonThemeData(
        style: FilledButton.styleFrom(
          minimumSize: const Size.fromHeight(48),
          backgroundColor: AppColors.primary,
          foregroundColor: Colors.white,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppRadius.medium),
          ),
          textStyle: const TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w600,
            fontFamily: 'Inter',
            fontFamilyFallback: ['Noto Sans SC'],
          ),
        ),
      ),
      outlinedButtonTheme: OutlinedButtonThemeData(
        style: OutlinedButton.styleFrom(
          minimumSize: const Size.fromHeight(48),
          foregroundColor: AppColors.primary,
          side: const BorderSide(color: AppColors.primary),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppRadius.medium),
          ),
        ),
      ),
      switchTheme: SwitchThemeData(
        trackOutlineColor: WidgetStateProperty.all(Colors.transparent),
        thumbColor: WidgetStateProperty.resolveWith(
          (states) => states.contains(WidgetState.selected)
              ? AppColors.primary
              : AppColors.textSecondary,
        ),
        trackColor: WidgetStateProperty.resolveWith(
          (states) => states.contains(WidgetState.selected)
              ? AppColors.primary.withOpacity(0.4)
              : AppColors.border,
        ),
      ),
      sliderTheme: const SliderThemeData(
        activeTrackColor: AppColors.primary,
        inactiveTrackColor: AppColors.border,
        thumbColor: AppColors.primary,
        trackHeight: 4,
        thumbShape: RoundSliderThumbShape(enabledThumbRadius: 10),
      ),
    );

    return base.copyWith(
      textSelectionTheme: const TextSelectionThemeData(
        cursorColor: AppColors.primary,
        selectionColor: Color(0x446366F1),
        selectionHandleColor: AppColors.primary,
      ),
    );
  }

  static const TextTheme _textTheme = TextTheme(
    headlineLarge: TextStyle(
      fontSize: 32,
      fontWeight: FontWeight.w700,
      color: AppColors.textPrimary,
      fontFamily: 'Inter',
      fontFamilyFallback: ['Noto Sans SC'],
    ),
    headlineMedium: TextStyle(
      fontSize: 24,
      fontWeight: FontWeight.w700,
      color: AppColors.textPrimary,
      fontFamily: 'Inter',
      fontFamilyFallback: ['Noto Sans SC'],
    ),
    headlineSmall: TextStyle(
      fontSize: 20,
      fontWeight: FontWeight.w600,
      color: AppColors.textPrimary,
      fontFamily: 'Inter',
      fontFamilyFallback: ['Noto Sans SC'],
    ),
    bodyLarge: TextStyle(
      fontSize: 16,
      height: 1.5,
      color: AppColors.textPrimary,
      fontFamily: 'Noto Sans SC',
      fontFamilyFallback: ['Inter'],
    ),
    bodyMedium: TextStyle(
      fontSize: 14,
      height: 1.4,
      color: AppColors.textSecondary,
      fontFamily: 'Noto Sans SC',
      fontFamilyFallback: ['Inter'],
    ),
    bodySmall: TextStyle(
      fontSize: 12,
      height: 1.3,
      color: AppColors.textSecondary,
      fontFamily: 'Noto Sans SC',
      fontFamilyFallback: ['Inter'],
    ),
  );
}