feat: Implement notification preferences management for both users and agents.

src/agents/agents.service.ts

@@ -2,6 +2,7 @@ import {
   Injectable,
   NotFoundException,
   ConflictException,
+  BadRequestException,
 } from '@nestjs/common';
 import { PrismaService } from '../prisma/prisma.service';
 import {
@@ -789,4 +790,54 @@ export class AgentsService {
         );
     }
   }
+
+  // =============================================
+  // NOTIFICATION PREFERENCES
+  // =============================================
+
+  async getNotificationPreferences(userId: string) {
+    const user = await this.prisma.user.findUnique({
+      where: { id: userId },
+      select: { notificationPreferences: true, role: true },
+    });
+
+    if (!user) {
+      throw new NotFoundException('User not found');
+    }
+
+    if (user.role !== 'AGENT') {
+      throw new BadRequestException('This endpoint is for agents only');
+    }
+
+    // Return preferences or default empty object
+    return user.notificationPreferences || { email: {}, push: {} };
+  }
+
+  async updateNotificationPreferences(
+    userId: string,
+    preferences: { email?: Record<string, boolean>; push?: Record<string, boolean> },
+  ) {
+    const user = await this.prisma.user.findUnique({
+      where: { id: userId },
+      select: { role: true },
+    });
+
+    if (!user) {
+      throw new NotFoundException('User not found');
+    }
+
+    if (user.role !== 'AGENT') {
+      throw new BadRequestException('This endpoint is for agents only');
+    }
+
+    const updatedUser = await this.prisma.user.update({
+      where: { id: userId },
+      data: {
+        notificationPreferences: preferences,
+      },
+      select: { notificationPreferences: true },
+    });
+
+    return updatedUser.notificationPreferences;
+  }
 }