feat: Implement in-app notifications with new database model, enhance Firebase initialization to support service account files, and add message read functionalities.

src/messages/messages.service.ts

@@ -4,13 +4,17 @@ import {
   ForbiddenException,
   BadRequestException,
 } from '@nestjs/common';
+import { EventEmitter2 } from '@nestjs/event-emitter';
 import { PrismaService } from '../prisma/prisma.service';
 import { CreateMessageDto } from './dto';
 import { ConnectionStatus, MessageStatus, MessageType, UserRole } from '@prisma/client';
 
 @Injectable()
 export class MessagesService {
-  constructor(private readonly prisma: PrismaService) {}
+  constructor(
+    private readonly prisma: PrismaService,
+    private readonly eventEmitter: EventEmitter2,
+  ) {}
 
   /**
    * Validate if a user can message an agent (must have ACCEPTED connection)
@@ -223,6 +227,23 @@ export class MessagesService {
       },
     });
 
+    // Emit push notification event for the recipient
+    const recipientUserId = isUser
+      ? conversation.agentProfile.userId
+      : conversation.userId;
+    const senderProfile =
+      message.sender?.agentProfile || message.sender?.userProfile;
+    const senderName = senderProfile
+      ? `${senderProfile.firstName || ''} ${senderProfile.lastName || ''}`.trim()
+      : 'Someone';
+
+    this.eventEmitter.emit('notification.message', {
+      recipientUserId,
+      senderName,
+      messagePreview: dto.content?.substring(0, 100) || '',
+      conversationId,
+    });
+
     return message;
   }