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

import 'package:worker/core/theme/colors.dart';
import 'package:worker/core/theme/typography.dart';

/// App theme configuration for Material 3 design system
/// Provides both light and dark theme variants
class AppTheme {
  // Prevent instantiation
  AppTheme._();

  // ==================== Light Theme ====================

  /// Light theme configuration
  static ThemeData lightTheme() {
    final ColorScheme colorScheme = ColorScheme.fromSeed(
      seedColor: AppColors.primaryBlue,
      brightness: Brightness.light,
      primary: AppColors.primaryBlue,
      secondary: AppColors.lightBlue,
      tertiary: AppColors.accentCyan,
      error: AppColors.danger,
      surface: AppColors.white,
      background: AppColors.grey50,
    );

    return ThemeData(
      useMaterial3: true,
      colorScheme: colorScheme,
      fontFamily: AppTypography.fontFamily,

      // ==================== App Bar Theme ====================
      appBarTheme: AppBarTheme(
        elevation: 0,
        centerTitle: true,
        backgroundColor: AppColors.primaryBlue,
        foregroundColor: AppColors.white,
        titleTextStyle: AppTypography.titleLarge.copyWith(
          color: AppColors.white,
          fontWeight: FontWeight.w600,
        ),
        iconTheme: const IconThemeData(
          color: AppColors.white,
          size: 24,
        ),
        systemOverlayStyle: SystemUiOverlayStyle.light,
      ),

      // ==================== Card Theme ====================
      cardTheme: const CardThemeData(
        elevation: 2,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.all(Radius.circular(12)),
        ),
        clipBehavior: Clip.antiAlias,
        color: AppColors.white,
        margin: EdgeInsets.symmetric(horizontal: 16, vertical: 8),
      ),

      // ==================== Elevated Button Theme ====================
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          backgroundColor: AppColors.primaryBlue,
          foregroundColor: AppColors.white,
          elevation: 2,
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(8),
          ),
          textStyle: AppTypography.buttonText,
          minimumSize: const Size(64, 48),
        ),
      ),

      // ==================== Text Button Theme ====================
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(
          foregroundColor: AppColors.primaryBlue,
          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(8),
          ),
          textStyle: AppTypography.buttonText,
        ),
      ),

      // ==================== Outlined Button Theme ====================
      outlinedButtonTheme: OutlinedButtonThemeData(
        style: OutlinedButton.styleFrom(
          foregroundColor: AppColors.primaryBlue,
          side: const BorderSide(color: AppColors.primaryBlue, width: 1.5),
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(8),
          ),
          textStyle: AppTypography.buttonText,
          minimumSize: const Size(64, 48),
        ),
      ),

      // ==================== Input Decoration Theme ====================
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: AppColors.white,
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: const BorderSide(color: AppColors.grey100, width: 1),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: const BorderSide(color: AppColors.grey100, width: 1),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: const BorderSide(color: AppColors.primaryBlue, width: 2),
        ),
        errorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: const BorderSide(color: AppColors.danger, width: 1),
        ),
        focusedErrorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: const BorderSide(color: AppColors.danger, width: 2),
        ),
        labelStyle: AppTypography.bodyMedium.copyWith(
          color: AppColors.grey500,
        ),
        hintStyle: AppTypography.bodyMedium.copyWith(
          color: AppColors.grey500,
        ),
        errorStyle: AppTypography.bodySmall.copyWith(
          color: AppColors.danger,
        ),
      ),

      // ==================== Bottom Navigation Bar Theme ====================
      bottomNavigationBarTheme: const BottomNavigationBarThemeData(
        backgroundColor: AppColors.white,
        selectedItemColor: AppColors.primaryBlue,
        unselectedItemColor: AppColors.grey500,
        selectedIconTheme: IconThemeData(
          size: 28,
          color: AppColors.primaryBlue,
        ),
        unselectedIconTheme: IconThemeData(
          size: 24,
          color: AppColors.grey500,
        ),
        selectedLabelStyle: TextStyle(
          fontSize: 12,
          fontWeight: FontWeight.w600,
          fontFamily: AppTypography.fontFamily,
        ),
        unselectedLabelStyle: TextStyle(
          fontSize: 12,
          fontWeight: FontWeight.normal,
          fontFamily: AppTypography.fontFamily,
        ),
        type: BottomNavigationBarType.fixed,
        elevation: 8,
      ),

      // ==================== Floating Action Button Theme ====================
      floatingActionButtonTheme: const FloatingActionButtonThemeData(
        backgroundColor: AppColors.accentCyan,
        foregroundColor: AppColors.white,
        elevation: 6,
        shape: CircleBorder(),
        iconSize: 24,
      ),

      // ==================== Chip Theme ====================
      chipTheme: ChipThemeData(
        backgroundColor: AppColors.grey50,
        selectedColor: AppColors.primaryBlue,
        disabledColor: AppColors.grey100,
        secondarySelectedColor: AppColors.lightBlue,
        labelStyle: AppTypography.labelMedium,
        secondaryLabelStyle: AppTypography.labelMedium.copyWith(
          color: AppColors.white,
        ),
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(16),
        ),
      ),

      // ==================== Dialog Theme ====================
      dialogTheme: const DialogThemeData(
        backgroundColor: AppColors.white,
        elevation: 8,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.all(Radius.circular(16)),
        ),
      ).copyWith(
        titleTextStyle: AppTypography.headlineMedium.copyWith(
          color: AppColors.grey900,
        ),
        contentTextStyle: AppTypography.bodyLarge.copyWith(
          color: AppColors.grey900,
        ),
      ),

      // ==================== Snackbar Theme ====================
      snackBarTheme: SnackBarThemeData(
        backgroundColor: AppColors.grey900,
        contentTextStyle: AppTypography.bodyMedium.copyWith(
          color: AppColors.white,
        ),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(8),
        ),
        behavior: SnackBarBehavior.floating,
        elevation: 4,
      ),

      // ==================== Divider Theme ====================
      dividerTheme: const DividerThemeData(
        color: AppColors.grey100,
        thickness: 1,
        space: 1,
      ),

      // ==================== Icon Theme ====================
      iconTheme: const IconThemeData(
        color: AppColors.grey900,
        size: 24,
      ),

      // ==================== List Tile Theme ====================
      listTileTheme: ListTileThemeData(
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
        titleTextStyle: AppTypography.titleMedium.copyWith(
          color: AppColors.grey900,
        ),
        subtitleTextStyle: AppTypography.bodyMedium.copyWith(
          color: AppColors.grey500,
        ),
        iconColor: AppColors.grey500,
      ),

      // ==================== Switch Theme ====================
      switchTheme: SwitchThemeData(
        thumbColor: MaterialStateProperty.resolveWith((states) {
          if (states.contains(MaterialState.selected)) {
            return AppColors.primaryBlue;
          }
          return AppColors.grey500;
        }),
        trackColor: MaterialStateProperty.resolveWith((states) {
          if (states.contains(MaterialState.selected)) {
            return AppColors.lightBlue;
          }
          return AppColors.grey100;
        }),
      ),

      // ==================== Checkbox Theme ====================
      checkboxTheme: CheckboxThemeData(
        fillColor: MaterialStateProperty.resolveWith((states) {
          if (states.contains(MaterialState.selected)) {
            return AppColors.primaryBlue;
          }
          return AppColors.white;
        }),
        checkColor: MaterialStateProperty.all(AppColors.white),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(4),
        ),
      ),

      // ==================== Radio Theme ====================
      radioTheme: RadioThemeData(
        fillColor: MaterialStateProperty.resolveWith((states) {
          if (states.contains(MaterialState.selected)) {
            return AppColors.primaryBlue;
          }
          return AppColors.grey500;
        }),
      ),

      // ==================== Progress Indicator Theme ====================
      progressIndicatorTheme: const ProgressIndicatorThemeData(
        color: AppColors.primaryBlue,
        linearTrackColor: AppColors.grey100,
        circularTrackColor: AppColors.grey100,
      ),

      // ==================== Badge Theme ====================
      badgeTheme: const BadgeThemeData(
        backgroundColor: AppColors.danger,
        textColor: AppColors.white,
        smallSize: 6,
        largeSize: 16,
      ),

      // ==================== Tab Bar Theme ====================
      tabBarTheme: const TabBarThemeData(
        labelColor: AppColors.primaryBlue,
        unselectedLabelColor: AppColors.grey500,
        indicatorColor: AppColors.primaryBlue,
      ).copyWith(
        labelStyle: AppTypography.labelLarge,
        unselectedLabelStyle: AppTypography.labelLarge,
      ),
    );
  }

  // ==================== Dark Theme ====================

  /// Dark theme configuration
  static ThemeData darkTheme() {
    final ColorScheme colorScheme = ColorScheme.fromSeed(
      seedColor: AppColors.primaryBlue,
      brightness: Brightness.dark,
      primary: AppColors.lightBlue,
      secondary: AppColors.accentCyan,
      tertiary: AppColors.primaryBlue,
      error: AppColors.danger,
      surface: const Color(0xFF1E1E1E),
      background: const Color(0xFF121212),
    );

    return ThemeData(
      useMaterial3: true,
      colorScheme: colorScheme,
      fontFamily: AppTypography.fontFamily,

      // ==================== App Bar Theme ====================
      appBarTheme: AppBarTheme(
        elevation: 0,
        centerTitle: true,
        backgroundColor: const Color(0xFF1E1E1E),
        foregroundColor: AppColors.white,
        titleTextStyle: AppTypography.titleLarge.copyWith(
          color: AppColors.white,
          fontWeight: FontWeight.w600,
        ),
        iconTheme: const IconThemeData(
          color: AppColors.white,
          size: 24,
        ),
        systemOverlayStyle: SystemUiOverlayStyle.light,
      ),

      // ==================== Card Theme ====================
      cardTheme: const CardThemeData(
        elevation: 2,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.all(Radius.circular(12)),
        ),
        clipBehavior: Clip.antiAlias,
        color: Color(0xFF1E1E1E),
        margin: EdgeInsets.symmetric(horizontal: 16, vertical: 8),
      ),

      // ==================== Elevated Button Theme ====================
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          backgroundColor: AppColors.lightBlue,
          foregroundColor: AppColors.white,
          elevation: 2,
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(8),
          ),
          textStyle: AppTypography.buttonText,
          minimumSize: const Size(64, 48),
        ),
      ),

      // ==================== Input Decoration Theme ====================
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: const Color(0xFF2A2A2A),
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: const BorderSide(color: Color(0xFF3A3A3A), width: 1),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: const BorderSide(color: Color(0xFF3A3A3A), width: 1),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: const BorderSide(color: AppColors.lightBlue, width: 2),
        ),
        errorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: const BorderSide(color: AppColors.danger, width: 1),
        ),
        focusedErrorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: const BorderSide(color: AppColors.danger, width: 2),
        ),
        labelStyle: AppTypography.bodyMedium.copyWith(
          color: AppColors.grey500,
        ),
        hintStyle: AppTypography.bodyMedium.copyWith(
          color: AppColors.grey500,
        ),
        errorStyle: AppTypography.bodySmall.copyWith(
          color: AppColors.danger,
        ),
      ),

      // ==================== Bottom Navigation Bar Theme ====================
      bottomNavigationBarTheme: const BottomNavigationBarThemeData(
        backgroundColor: Color(0xFF1E1E1E),
        selectedItemColor: AppColors.lightBlue,
        unselectedItemColor: AppColors.grey500,
        selectedIconTheme: IconThemeData(
          size: 28,
          color: AppColors.lightBlue,
        ),
        unselectedIconTheme: IconThemeData(
          size: 24,
          color: AppColors.grey500,
        ),
        selectedLabelStyle: TextStyle(
          fontSize: 12,
          fontWeight: FontWeight.w600,
          fontFamily: AppTypography.fontFamily,
        ),
        unselectedLabelStyle: TextStyle(
          fontSize: 12,
          fontWeight: FontWeight.normal,
          fontFamily: AppTypography.fontFamily,
        ),
        type: BottomNavigationBarType.fixed,
        elevation: 8,
      ),

      // ==================== Floating Action Button Theme ====================
      floatingActionButtonTheme: const FloatingActionButtonThemeData(
        backgroundColor: AppColors.accentCyan,
        foregroundColor: AppColors.white,
        elevation: 6,
        shape: CircleBorder(),
        iconSize: 24,
      ),

      // ==================== Snackbar Theme ====================
      snackBarTheme: SnackBarThemeData(
        backgroundColor: const Color(0xFF2A2A2A),
        contentTextStyle: AppTypography.bodyMedium.copyWith(
          color: AppColors.white,
        ),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(8),
        ),
        behavior: SnackBarBehavior.floating,
        elevation: 4,
      ),
    );
  }
}