feat: implement support plan subscription functionality

src/modules/support-plans/providers/support-plans.service.ts

@@ -1,17 +1,26 @@
 import { BadRequestException, Injectable } from "@nestjs/common";
+import dayjs from "dayjs";
 import { DataSource } from "typeorm";
 
 import { SupportPlanMessage } from "../../../common/enums/message.enum";
+import { INVOICE } from "../../invoices/constants";
+import { InvoicesService } from "../../invoices/providers/invoices.service";
+import { UsersService } from "../../users/providers/users.service";
 import { CreateSupportPlanDto } from "../DTO/create-support-plan.dto";
 import { GetSupportPlanListQueryDto } from "../DTO/get-support-plan-list-query.dto";
 import { UpdateSupportPlanDto } from "../DTO/update-support-plan-feature.dto";
+import { UserSupportPlanStatus } from "../enums/user-support-plan-status.enum";
 import { SupportPlanFeatureRepository } from "../repositories/support-plan-feature.repository";
 import { SupportPlanRepository } from "../repositories/support-plan.repository";
+import { UserSupportPlanRepository } from "../repositories/user-support-plan.repository";
 @Injectable()
 export class SupportPlansService {
   constructor(
     private readonly supportPlanRepo: SupportPlanRepository,
     private readonly supportPlanFeatureRepo: SupportPlanFeatureRepository,
+    private readonly userSupportPlanRepo: UserSupportPlanRepository,
+    private readonly usersService: UsersService,
+    private readonly invoicesService: InvoicesService,
     private readonly dataSource: DataSource,
   ) {}
 
@@ -32,6 +41,14 @@ export class SupportPlansService {
       paginate: true,
     };
   }
+
+  //***************************************** */
+  async getSupportPlansListUser() {
+    const supportPlans = await this.supportPlanRepo.getSupportPlansListUser();
+    return {
+      supportPlans,
+    };
+  }
   //***************************************** */
   async getSupportPlanById(id: string) {
     const supportPlan = await this.supportPlanRepo.getSupportPlanById(id);
@@ -90,4 +107,60 @@ export class SupportPlansService {
       await queryRunner.release();
     }
   }
+  //***************************************** */
+  async subscribeToSupportPlan(id: string, userId: string) {
+    const queryRunner = this.dataSource.createQueryRunner();
+    try {
+      await queryRunner.connect();
+      await queryRunner.startTransaction();
+
+      const supportPlan = await queryRunner.manager.findOne(this.supportPlanRepo.target, { where: { id } });
+      if (!supportPlan) throw new BadRequestException(SupportPlanMessage.SUPPORT_PLAN_NOT_FOUND);
+
+      const user = await this.usersService.findOneByIdWithQueryRunner(userId, queryRunner);
+
+      const existingUserSupportPlan = await queryRunner.manager.findOne(this.userSupportPlanRepo.target, {
+        where: { user: { id: userId }, supportPlan: { id } },
+      });
+
+      if (existingUserSupportPlan) throw new BadRequestException(SupportPlanMessage.SUPPORT_PLAN_ALREADY_SUBSCRIBED_OR_INVOICE_EXIST);
+
+      const existingUserSupport = await queryRunner.manager.findOne(this.userSupportPlanRepo.target, {
+        where: { user: { id: userId } },
+      });
+
+      if (existingUserSupport) throw new BadRequestException(SupportPlanMessage.USER_ALREADY_HAS_SUPPORT_PLAN);
+
+      const startDate = dayjs().toDate();
+      const endDate = dayjs().add(supportPlan.duration, "day").toDate();
+
+      const userSupportPlan = queryRunner.manager.create(this.userSupportPlanRepo.target, { user, supportPlan, startDate, endDate });
+
+      await queryRunner.manager.save(this.userSupportPlanRepo.target, userSupportPlan);
+
+      const invoiceDueDate = dayjs(userSupportPlan.startDate).add(INVOICE.DUEDATE, "day").toDate();
+
+      const invoice = await this.invoicesService.createInvoiceForSupportPlan(
+        user,
+        supportPlan,
+        userSupportPlan,
+        invoiceDueDate,
+        queryRunner,
+      );
+      userSupportPlan.status = UserSupportPlanStatus.INACTIVE;
+
+      await queryRunner.manager.save(this.userSupportPlanRepo.target, userSupportPlan);
+
+      await queryRunner.commitTransaction();
+      return {
+        message: SupportPlanMessage.SUPPORT_PLAN_SUBSCRIBED,
+        invoice,
+      };
+    } catch (error) {
+      await queryRunner.rollbackTransaction();
+      throw error;
+    } finally {
+      await queryRunner.release();
+    }
+  }
 }