251123:0200 T6.1 to DO

backend/src/modules/notification/notification.gateway.ts

@@ -0,0 +1,38 @@
+import {
+  WebSocketGateway,
+  WebSocketServer,
+  OnGatewayConnection,
+  OnGatewayDisconnect,
+} from '@nestjs/websockets';
+import { Server, Socket } from 'socket.io';
+import { Logger } from '@nestjs/common';
+
+@WebSocketGateway({
+  cors: {
+    origin: '*',
+  },
+  namespace: 'notifications',
+})
+export class NotificationGateway
+  implements OnGatewayConnection, OnGatewayDisconnect
+{
+  @WebSocketServer()
+  server!: Server; // ✅ FIX: เติม ! (Definite Assignment Assertion)
+
+  private readonly logger = new Logger(NotificationGateway.name);
+
+  handleConnection(client: Socket) {
+    this.logger.log(`Client connected: ${client.id}`);
+  }
+
+  handleDisconnect(client: Socket) {
+    this.logger.log(`Client disconnected: ${client.id}`);
+  }
+
+  /**
+   * ส่งแจ้งเตือนไปหา User แบบ Real-time
+   */
+  sendToUser(userId: number, payload: any) {
+    this.server.to(`user_${userId}`).emit('new_notification', payload);
+  }
+}