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

enum ThemeType {
  defaultTheme,
  pastelTheme,
  darkTheme,
  // 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

  // Couleurs pour le thème sombre
  static const Color _darkPrimaryColor = Color(0xFF4299E1);
  static const Color _darkSecondaryColor = Color(0xFF2D3748);
  static const Color _darkBackgroundColor = Color(0xFF1A202C);
  static const Color _darkTextColor = Color(0xFFF7FAFC);
  static const Color _darkErrorColor = Color(0xFFFEB2B2);
  static const Color _darkWarningColor = Color(0xFFFBD38D);
  static const Color _darkSuccessColor = Color(0xFF9AE6B4);

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

  // Getters pour les couleurs du thème actuel
  Color get primaryColor {
    switch (_currentTheme) {
      case ThemeType.defaultTheme:
        return _defaultPrimaryColor;
      case ThemeType.pastelTheme:
        return _pastelPrimaryColor;
      case ThemeType.darkTheme:
        return _darkPrimaryColor;
    }
  }

  Color get secondaryColor {
    switch (_currentTheme) {
      case ThemeType.defaultTheme:
        return _defaultSecondaryColor;
      case ThemeType.pastelTheme:
        return _pastelSecondaryColor;
      case ThemeType.darkTheme:
        return _darkSecondaryColor;
    }
  }

  Color get backgroundColor {
    switch (_currentTheme) {
      case ThemeType.defaultTheme:
        return _defaultBackgroundColor;
      case ThemeType.pastelTheme:
        return _pastelBackgroundColor;
      case ThemeType.darkTheme:
        return _darkBackgroundColor;
    }
  }

  Color get textColor {
    switch (_currentTheme) {
      case ThemeType.defaultTheme:
        return _defaultTextColor;
      case ThemeType.pastelTheme:
        return _pastelTextColor;
      case ThemeType.darkTheme:
        return _darkTextColor;
    }
  }

  Color get errorColor {
    switch (_currentTheme) {
      case ThemeType.defaultTheme:
        return _defaultErrorColor;
      case ThemeType.pastelTheme:
        return _pastelErrorColor;
      case ThemeType.darkTheme:
        return _darkErrorColor;
    }
  }

  Color get warningColor {
    switch (_currentTheme) {
      case ThemeType.defaultTheme:
        return _defaultWarningColor;
      case ThemeType.pastelTheme:
        return _pastelWarningColor;
      case ThemeType.darkTheme:
        return _darkWarningColor;
    }
  }

  Color get successColor {
    switch (_currentTheme) {
      case ThemeType.defaultTheme:
        return _defaultSuccessColor;
      case ThemeType.pastelTheme:
        return _pastelSuccessColor;
      case ThemeType.darkTheme:
        return _darkSuccessColor;
    }
  }

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

  // Thème Material 3
  ThemeData get lightTheme {
    return _buildTheme(_defaultPrimaryColor, _defaultSecondaryColor, _defaultBackgroundColor, _defaultTextColor, _defaultErrorColor, _defaultWarningColor, _defaultSuccessColor);
  }

  // Thème Material 3 pastel
  ThemeData get pastelTheme {
    return _buildTheme(_pastelPrimaryColor, _pastelSecondaryColor, _pastelBackgroundColor, _pastelTextColor, _pastelErrorColor, _pastelWarningColor, _pastelSuccessColor);
  }

  // Thème Material 3 sombre
  ThemeData get darkTheme {
    return _buildTheme(_darkPrimaryColor, _darkSecondaryColor, _darkBackgroundColor, _darkTextColor, _darkErrorColor, _darkWarningColor, _darkSuccessColor);
  }

  ThemeData _buildTheme(Color primary, Color secondary, Color background, Color text, Color error, Color warning, Color success) {
    return ThemeData(
      useMaterial3: true,
      colorScheme: ColorScheme.light(
        primary: primary,
        secondary: secondary,
        background: background,
        error: error,
        tertiary: warning,
        onPrimary: Colors.white,
        onSecondary: Colors.white,
        onBackground: text,
        onError: Colors.white,
        onTertiary: text,
      ),
      scaffoldBackgroundColor: background,
      textTheme: TextTheme(
        displayLarge: _getTitleStyle(32, text),
        displayMedium: _getTitleStyle(28, text),
        displaySmall: _getTitleStyle(24, text),
        headlineMedium: _getTitleStyle(20, text),
        headlineSmall: _getTitleStyle(18, text),
        titleLarge: _getTitleStyle(16, text),
        bodyLarge: _getBodyStyle(16, text),
        bodyMedium: _getBodyStyle(14, text),
        bodySmall: _getBodyStyle(12, text),
      ),
      appBarTheme: AppBarTheme(
        backgroundColor: primary,
        foregroundColor: Colors.white,
        titleTextStyle: _getTitleStyle(20, Colors.white),
      ),
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          backgroundColor: primary,
          foregroundColor: Colors.white,
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(8),
          ),
        ),
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: secondary.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: primary, width: 2),
        ),
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      ),
      snackBarTheme: SnackBarThemeData(
        backgroundColor: error,
        contentTextStyle: _getBodyStyle(14, Colors.white),
      ),
    );
  }

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

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