feat: add email notification functionality to the notifications service by integrating EmailModule and EmailService.

src/notifications/notifications.module.ts

@@ -2,9 +2,10 @@ import { Module } from '@nestjs/common';
 import { ConfigModule } from '@nestjs/config';
 import { NotificationsService } from './notifications.service';
 import { NotificationsController } from './notifications.controller';
+import { EmailModule } from '../email';
 
 @Module({
-  imports: [ConfigModule],
+  imports: [ConfigModule, EmailModule],
   controllers: [NotificationsController],
   providers: [NotificationsService],
   exports: [NotificationsService],

src/notifications/notifications.service.ts

@@ -6,6 +6,7 @@ import * as admin from 'firebase-admin';
 import * as fs from 'fs';
 import * as path from 'path';
 import { PrismaService } from '../prisma/prisma.service';
+import { EmailService } from '../email/email.service';
 
 interface FcmToken {
   token: string;
@@ -27,6 +28,7 @@ export class NotificationsService implements OnModuleInit {
   constructor(
     private readonly prisma: PrismaService,
     private readonly configService: ConfigService,
+    private readonly emailService: EmailService,
   ) {}
 
   onModuleInit() {
@@ -221,18 +223,19 @@ export class NotificationsService implements OnModuleInit {
     actionUrl?: string,
     data?: Record<string, string>,
   ) {
-    // Check user notification preferences for inApp
+    // Check user notification preferences
     const user = await this.prisma.user.findUnique({
       where: { id: userId },
-      select: { notificationPreferences: true, fcmTokens: true },
+      select: { notificationPreferences: true, fcmTokens: true, email: true },
     });
 
     if (!user) return;
 
     const prefs = user.notificationPreferences as Record<string, any> | null;
     const inAppEnabled = prefs?.notifications?.[category]?.inApp !== false;
+    const emailEnabled = prefs?.notifications?.[category]?.email === true;
 
-    // Always persist the in-app notification (if enabled)
+    // Persist in-app notification (if enabled)
     if (inAppEnabled) {
       await this.prisma.notification.create({
         data: {
@@ -246,7 +249,7 @@ export class NotificationsService implements OnModuleInit {
       });
     }
 
-    // Send push notification (if Firebase configured and user has tokens)
+    // Send push notification via FCM (if enabled and user has tokens)
     if (inAppEnabled) {
       await this.sendPushNotification(userId, user, {
         title,
@@ -254,6 +257,47 @@ export class NotificationsService implements OnModuleInit {
         data,
       });
     }
+
+    // Send email notification (if email preference enabled)
+    if (emailEnabled && user.email) {
+      await this.sendEmailNotification(user.email, title, description, actionUrl);
+    }
+  }
+
+  private async sendEmailNotification(
+    email: string,
+    title: string,
+    body: string,
+    actionUrl?: string,
+  ): Promise<void> {
+    try {
+      const frontendUrl = this.configService.get<string>('app.frontendUrl') || 'http://localhost:3000';
+      const fullUrl = actionUrl ? `${frontendUrl}${actionUrl}` : frontendUrl;
+
+      await this.emailService.sendEmail({
+        to: email,
+        subject: title,
+        html: `
+          <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto;">
+            <div style="background-color: #00293d; padding: 20px; text-align: center;">
+              <h1 style="color: white; margin: 0; font-size: 20px;">RE-Quest</h1>
+            </div>
+            <div style="padding: 30px 20px;">
+              <h2 style="color: #00293d; font-size: 18px; margin-top: 0;">${title}</h2>
+              <p style="color: #333; font-size: 14px; line-height: 1.6;">${body}</p>
+              ${actionUrl ? `<a href="${fullUrl}" style="display: inline-block; background-color: #e58625; color: white; padding: 12px 24px; text-decoration: none; border-radius: 15px; font-weight: bold; margin-top: 15px;">View Details</a>` : ''}
+            </div>
+            <div style="background-color: #f5f5f5; padding: 15px 20px; text-align: center; font-size: 12px; color: #666;">
+              <p>You received this email because of your notification settings on RE-Quest.</p>
+              <a href="${frontendUrl}/agent/settings/notifications" style="color: #e58625;">Manage notification preferences</a>
+            </div>
+          </div>
+        `,
+        text: `${title}\n\n${body}\n\n${actionUrl ? `View details: ${fullUrl}` : ''}`,
+      });
+    } catch (error) {
+      this.logger.error(`Failed to send email notification to ${email}: ${error.message}`);
+    }
   }
 
   private async sendPushNotification(