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

enum ThemeType {
  defaultTheme,
  pastelTheme,
  // Ajouter d'autres thèmes ici
}

class AppTheme extends ChangeNotifier {
  static final AppTheme _instance = AppTheme._internal();
  factory AppTheme() => _instance;
  AppTheme._internal();

  // Thème par défaut (P'titsPas)
  static const Color _defaultPrimaryColor = Color(0xFF2B6CB0);
  static const Color _defaultSecondaryColor = Color(0xFFF7FAFC);
  static const Color _defaultBackgroundColor = Color(0xFFFFFFFF);
  static const Color _defaultTextColor = Color(0xFF000000);
  static const Color _defaultErrorColor = Color(0xFFF4A28C);
  static const Color _defaultWarningColor = Color(0xFFF2D269);
  static const Color _defaultSuccessColor = Color(0xFF4CAF50);

  // Thème Pastel
  static const Color _pastelPrimaryColor = Color(0xFF8AD0C8); // Turquoise
  static const Color _pastelSecondaryColor = Color(0xFFC6A3D8); // Violet Pastel
  static const Color _pastelBackgroundColor = Color(0xFFFFFEF9); // Ivoire BG
  static const Color _pastelTextColor = Color(0xFF2F2F2F); // Encre
  static const Color _pastelErrorColor = Color(0xFFFFB4AB); // Rose Pastel
  static const Color _pastelWarningColor = Color(0xFFFFE4B5); // Jaune Pastel
  static const Color _pastelSuccessColor = Color(0xFFA5D6A7); // Vert Pastel

  // Configuration du thème actuel
  ThemeType _currentTheme = ThemeType.defaultTheme;
  ThemeType get currentTheme => _currentTheme;

  // Getters pour les couleurs du thème actuel
  Color get primaryColor => _currentTheme == ThemeType.defaultTheme ? _defaultPrimaryColor : _pastelPrimaryColor;
  Color get secondaryColor => _currentTheme == ThemeType.defaultTheme ? _defaultSecondaryColor : _pastelSecondaryColor;
  Color get backgroundColor => _currentTheme == ThemeType.defaultTheme ? _defaultBackgroundColor : _pastelBackgroundColor;
  Color get textColor => _currentTheme == ThemeType.defaultTheme ? _defaultTextColor : _pastelTextColor;
  Color get errorColor => _currentTheme == ThemeType.defaultTheme ? _defaultErrorColor : _pastelErrorColor;
  Color get warningColor => _currentTheme == ThemeType.defaultTheme ? _defaultWarningColor : _pastelWarningColor;
  Color get successColor => _currentTheme == ThemeType.defaultTheme ? _defaultSuccessColor : _pastelSuccessColor;

  // Méthode pour changer de thème
  void setTheme(ThemeType theme) {
    _currentTheme = theme;
    notifyListeners();
  }

  // Thème Material 3
  ThemeData get lightTheme {
    return ThemeData(
      useMaterial3: true,
      colorScheme: ColorScheme.light(
        primary: primaryColor,
        secondary: secondaryColor,
        background: backgroundColor,
        error: errorColor,
        tertiary: warningColor,
        onPrimary: Colors.white,
        onSecondary: Colors.white,
        onBackground: textColor,
        onError: Colors.white,
        onTertiary: textColor,
      ),
      scaffoldBackgroundColor: backgroundColor,
      textTheme: TextTheme(
        displayLarge: _getTitleStyle(32),
        displayMedium: _getTitleStyle(28),
        displaySmall: _getTitleStyle(24),
        headlineMedium: _getTitleStyle(20),
        headlineSmall: _getTitleStyle(18),
        titleLarge: _getTitleStyle(16),
        bodyLarge: _getBodyStyle(16),
        bodyMedium: _getBodyStyle(14),
        bodySmall: _getBodyStyle(12),
      ),
      appBarTheme: AppBarTheme(
        backgroundColor: primaryColor,
        foregroundColor: Colors.white,
        titleTextStyle: _getTitleStyle(20).copyWith(color: Colors.white),
      ),
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          backgroundColor: primaryColor,
          foregroundColor: Colors.white,
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(8),
          ),
        ),
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: secondaryColor.withOpacity(0.5),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: BorderSide.none,
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: BorderSide.none,
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: BorderSide(color: primaryColor, width: 2),
        ),
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      ),
      snackBarTheme: SnackBarThemeData(
        backgroundColor: errorColor,
        contentTextStyle: _getBodyStyle(14).copyWith(color: Colors.white),
      ),
    );
  }

  // Méthodes privées pour la typographie
  TextStyle _getTitleStyle(double fontSize) {
    return GoogleFonts.merienda(
      fontSize: fontSize,
      fontWeight: FontWeight.w600,
      color: textColor,
    );
  }

  TextStyle _getBodyStyle(double fontSize) {
    return GoogleFonts.merriweather(
      fontSize: fontSize,
      fontWeight: FontWeight.w300,
      color: textColor,
    );
  }
}