EM2_ERP/em2rp/lib/models/alert_model.dart

 import 'package:cloud_firestore/cloud_firestore.dart';

enum AlertType {
  lowStock,       // Stock faible
  maintenanceDue, // Maintenance à venir
  conflict,        // Conflit disponibilité
  lost            // Équipement perdu
}

String alertTypeToString(AlertType type) {
  switch (type) {
    case AlertType.lowStock:
      return 'LOW_STOCK';
    case AlertType.maintenanceDue:
      return 'MAINTENANCE_DUE';
    case AlertType.conflict:
      return 'CONFLICT';
    case AlertType.lost:
      return 'LOST';
  }
}

AlertType alertTypeFromString(String? type) {
  switch (type) {
    case 'LOW_STOCK':
      return AlertType.lowStock;
    case 'MAINTENANCE_DUE':
      return AlertType.maintenanceDue;
    case 'CONFLICT':
      return AlertType.conflict;
    case 'LOST':
      return AlertType.lost;
    default:
      return AlertType.conflict;
  }
}

class AlertModel {
  final String id;                  // ID généré automatiquement
  final AlertType type;             // Type d'alerte
  final String message;             // Message de l'alerte
  final String? equipmentId;        // ID de l'équipement concerné (optionnel)
  final DateTime createdAt;         // Date de création
  final bool isRead;                // Statut lu/non lu

  AlertModel({
    required this.id,
    required this.type,
    required this.message,
    this.equipmentId,
    required this.createdAt,
    this.isRead = false,
  });

  factory AlertModel.fromMap(Map<String, dynamic> map, String id) {
    // Fonction helper pour convertir Timestamp ou String ISO en DateTime
    DateTime _parseDate(dynamic value) {
      if (value == null) return DateTime.now();
      if (value is Timestamp) return value.toDate();
      if (value is String) return DateTime.tryParse(value) ?? DateTime.now();
      return DateTime.now();
    }

    return AlertModel(
      id: id,
      type: alertTypeFromString(map['type']),
      message: map['message'] ?? '',
      equipmentId: map['equipmentId'],
      createdAt: _parseDate(map['createdAt']),
      isRead: map['isRead'] ?? false,
    );
  }

  Map<String, dynamic> toMap() {
    return {
      'type': alertTypeToString(type),
      'message': message,
      'equipmentId': equipmentId,
      'createdAt': Timestamp.fromDate(createdAt),
      'isRead': isRead,
    };
  }

  AlertModel copyWith({
    String? id,
    AlertType? type,
    String? message,
    String? equipmentId,
    DateTime? createdAt,
    bool? isRead,
  }) {
    return AlertModel(
      id: id ?? this.id,
      type: type ?? this.type,
      message: message ?? this.message,
      equipmentId: equipmentId ?? this.equipmentId,
      createdAt: createdAt ?? this.createdAt,
      isRead: isRead ?? this.isRead,
    );
  }
}