feat: add Student-User association and activate all notification TODOs

apps/server/src/bills/bills.controller.ts

@@ -12,9 +12,13 @@ import {
   Res,
   Req,
 } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository, In } from 'typeorm';
 import { BillsService } from './bills.service';
 import { NotificationsService } from '../notifications/notifications.service';
 import { NotificationType } from '../entities/notification.entity';
+import { Student } from '../entities/student.entity';
+import { Bill } from '../entities/bill.entity';
 import { BillsExportService } from './bills-export.service';
 import { GenerateBillsDto, UpdateBillStatusDto } from './dto/bill.dto';
 import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
@@ -23,14 +27,14 @@ import { extractRequestInfo } from '../common/request-utils';
 import { RequirePermission } from '../auth/decorators/permission.decorator';
 import type { Response } from 'express';
 
-@UseGuards(JwtAuthGuard)
-@Controller('bills')
 export class BillsController {
   constructor(
     private service: BillsService,
     private exportService: BillsExportService,
     private logService: OperationLogsService,
     private readonly notificationsService: NotificationsService,
+    @InjectRepository(Student) private studentRepo: Repository<Student>,
+    @InjectRepository(Bill) private billRepo: Repository<Bill>,
   ) {}
 
   @Post('generate')
@@ -47,7 +51,20 @@ export class BillsController {
       ipAddress,
       userAgent,
     });
-    // TODO: Send notifications for bill_generated — studentId→userId mapping unavailable
+    // Send bill_generated notifications
+    try {
+      for (const bill of result.bills) {
+        const student = await this.studentRepo.findOne({ where: { id: bill.studentId } });
+        if (student?.userId) {
+          void this.notificationsService.create({
+            recipientIds: [student.userId],
+            type: NotificationType.BILL_GENERATED,
+            title: '新账单',
+            content: `您有一笔新账单,金额: ¥${bill.totalAmount}, 周期: ${dto.periodStart}~${dto.periodEnd}`,
+          });
+        }
+      }
+    } catch (_) { /* don't block response */ }
     return result;
   }
 
@@ -92,7 +109,18 @@ export class BillsController {
       ipAddress,
       userAgent,
     });
-    // TODO: Send notification for bill_paid — bill.studentId→userId mapping unavailable
+    // Send bill_paid notification
+    try {
+      const student = await this.studentRepo.findOne({ where: { id: result.studentId } });
+      if (student?.userId) {
+        void this.notificationsService.create({
+          recipientIds: [student.userId],
+          type: NotificationType.BILL_PAID,
+          title: '账单已确认',
+          content: `账单 #${result.id} 已确认收款,金额: ¥${result.totalAmount}`,
+        });
+      }
+    } catch (_) { /* don't block response */ }
     return result;
   }
 
@@ -110,7 +138,21 @@ export class BillsController {
       ipAddress,
       userAgent,
     });
-    // TODO: Send notification for bill_paid (batch) — bill.studentId→userId mapping unavailable
+    // Send bill_paid notifications (batch)
+    try {
+      const bills = await this.billRepo.findBy({ id: In(body.ids) });
+      for (const bill of bills) {
+        const student = await this.studentRepo.findOne({ where: { id: bill.studentId } });
+        if (student?.userId) {
+          void this.notificationsService.create({
+            recipientIds: [student.userId],
+            type: NotificationType.BILL_PAID,
+            title: '账单已确认',
+            content: `账单 #${bill.id} 已确认收款,金额: ¥${bill.totalAmount}`,
+          });
+        }
+      }
+    } catch (_) { /* don't block response */ }
     return result;
   }