/// Classes d'échec pour la gestion d'erreurs structurée
abstract class Failure {
  final String message;
  final String? code;
  final Map<String, dynamic>? details;

  const Failure({
    required this.message,
    this.code,
    this.details,
  });

  @override
  String toString() => 'Failure(message: $message, code: $code)';

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) return true;
    return other is Failure &&
        other.message == message &&
        other.code == code;
  }

  @override
  int get hashCode => message.hashCode ^ code.hashCode;
}

/// Échec réseau (problèmes de connectivité, timeout, etc.)
class NetworkFailure extends Failure {
  const NetworkFailure({
    required super.message,
    super.code,
    super.details,
  });

  factory NetworkFailure.noConnection() {
    return const NetworkFailure(
      message: 'Aucune connexion internet disponible',
      code: 'NO_CONNECTION',
    );
  }

  factory NetworkFailure.timeout() {
    return const NetworkFailure(
      message: 'Délai d\'attente dépassé',
      code: 'TIMEOUT',
    );
  }

  factory NetworkFailure.serverUnreachable() {
    return const NetworkFailure(
      message: 'Serveur inaccessible',
      code: 'SERVER_UNREACHABLE',
    );
  }
}

/// Échec serveur (erreurs HTTP 5xx, erreurs API, etc.)
class ServerFailure extends Failure {
  final int? statusCode;

  const ServerFailure({
    required super.message,
    super.code,
    super.details,
    this.statusCode,
  });

  factory ServerFailure.internalError() {
    return const ServerFailure(
      message: 'Erreur interne du serveur',
      code: 'INTERNAL_ERROR',
      statusCode: 500,
    );
  }

  factory ServerFailure.serviceUnavailable() {
    return const ServerFailure(
      message: 'Service temporairement indisponible',
      code: 'SERVICE_UNAVAILABLE',
      statusCode: 503,
    );
  }

  factory ServerFailure.badGateway() {
    return const ServerFailure(
      message: 'Passerelle défaillante',
      code: 'BAD_GATEWAY',
      statusCode: 502,
    );
  }
}

/// Échec de validation (données invalides, contraintes non respectées)
class ValidationFailure extends Failure {
  final Map<String, List<String>>? fieldErrors;

  const ValidationFailure({
    required super.message,
    super.code,
    super.details,
    this.fieldErrors,
  });

  factory ValidationFailure.invalidData(String field, String error) {
    return ValidationFailure(
      message: 'Données invalides',
      code: 'INVALID_DATA',
      fieldErrors: {field: [error]},
    );
  }

  factory ValidationFailure.requiredField(String field) {
    return ValidationFailure(
      message: 'Champ requis manquant',
      code: 'REQUIRED_FIELD',
      fieldErrors: {field: ['Ce champ est requis']},
    );
  }

  factory ValidationFailure.multipleErrors(Map<String, List<String>> errors) {
    return ValidationFailure(
      message: 'Plusieurs erreurs de validation',
      code: 'MULTIPLE_ERRORS',
      fieldErrors: errors,
    );
  }
}

/// Échec d'authentification (login, permissions, tokens expirés)
class AuthFailure extends Failure {
  const AuthFailure({
    required super.message,
    super.code,
    super.details,
  });

  factory AuthFailure.invalidCredentials() {
    return const AuthFailure(
      message: 'Identifiants invalides',
      code: 'INVALID_CREDENTIALS',
    );
  }

  factory AuthFailure.tokenExpired() {
    return const AuthFailure(
      message: 'Session expirée, veuillez vous reconnecter',
      code: 'TOKEN_EXPIRED',
    );
  }

  factory AuthFailure.insufficientPermissions() {
    return const AuthFailure(
      message: 'Permissions insuffisantes',
      code: 'INSUFFICIENT_PERMISSIONS',
    );
  }

  factory AuthFailure.accountLocked() {
    return const AuthFailure(
      message: 'Compte verrouillé',
      code: 'ACCOUNT_LOCKED',
    );
  }
}

/// Échec de données (ressource non trouvée, conflit, etc.)
class DataFailure extends Failure {
  const DataFailure({
    required super.message,
    super.code,
    super.details,
  });

  factory DataFailure.notFound(String resource) {
    return DataFailure(
      message: '$resource non trouvé(e)',
      code: 'NOT_FOUND',
      details: {'resource': resource},
    );
  }

  factory DataFailure.alreadyExists(String resource) {
    return DataFailure(
      message: '$resource existe déjà',
      code: 'ALREADY_EXISTS',
      details: {'resource': resource},
    );
  }

  factory DataFailure.conflict(String reason) {
    return DataFailure(
      message: 'Conflit de données : $reason',
      code: 'CONFLICT',
      details: {'reason': reason},
    );
  }
}

/// Échec de cache (données expirées, cache corrompu)
class CacheFailure extends Failure {
  const CacheFailure({
    required super.message,
    super.code,
    super.details,
  });

  factory CacheFailure.expired() {
    return const CacheFailure(
      message: 'Données en cache expirées',
      code: 'CACHE_EXPIRED',
    );
  }

  factory CacheFailure.corrupted() {
    return const CacheFailure(
      message: 'Cache corrompu',
      code: 'CACHE_CORRUPTED',
    );
  }
}

/// Échec de fichier (lecture, écriture, format)
class FileFailure extends Failure {
  const FileFailure({
    required super.message,
    super.code,
    super.details,
  });

  factory FileFailure.notFound(String filePath) {
    return FileFailure(
      message: 'Fichier non trouvé',
      code: 'FILE_NOT_FOUND',
      details: {'filePath': filePath},
    );
  }

  factory FileFailure.accessDenied(String filePath) {
    return FileFailure(
      message: 'Accès au fichier refusé',
      code: 'ACCESS_DENIED',
      details: {'filePath': filePath},
    );
  }

  factory FileFailure.invalidFormat(String expectedFormat) {
    return FileFailure(
      message: 'Format de fichier invalide',
      code: 'INVALID_FORMAT',
      details: {'expectedFormat': expectedFormat},
    );
  }
}

/// Échec générique pour les cas non spécifiés
class UnknownFailure extends Failure {
  const UnknownFailure({
    required super.message,
    super.code,
    super.details,
  });

  factory UnknownFailure.fromException(Exception exception) {
    return UnknownFailure(
      message: 'Erreur inattendue : ${exception.toString()}',
      code: 'UNKNOWN_ERROR',
      details: {'exception': exception.toString()},
    );
  }
}