Add equipment management features (and qr generation support)

em2rp/lib/models/alert_model.dart

@@ -0,0 +1,89 @@
+import 'package:cloud_firestore/cloud_firestore.dart';
+
+enum AlertType {
+  lowStock,       // Stock faible
+  maintenanceDue, // Maintenance à venir
+  conflict        // Conflit disponibilité
+}
+
+String alertTypeToString(AlertType type) {
+  switch (type) {
+    case AlertType.lowStock:
+      return 'LOW_STOCK';
+    case AlertType.maintenanceDue:
+      return 'MAINTENANCE_DUE';
+    case AlertType.conflict:
+      return 'CONFLICT';
+  }
+}
+
+AlertType alertTypeFromString(String? type) {
+  switch (type) {
+    case 'LOW_STOCK':
+      return AlertType.lowStock;
+    case 'MAINTENANCE_DUE':
+      return AlertType.maintenanceDue;
+    case 'CONFLICT':
+      return AlertType.conflict;
+    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) {
+    return AlertModel(
+      id: id,
+      type: alertTypeFromString(map['type']),
+      message: map['message'] ?? '',
+      equipmentId: map['equipmentId'],
+      createdAt: (map['createdAt'] as Timestamp?)?.toDate() ?? DateTime.now(),
+      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,
+    );
+  }
+}
+