chore: complete create discount

src/modules/discounts/providers/discounts.service.ts

@@ -0,0 +1,91 @@
+import { randomBytes } from "node:crypto";
+
+import { BadRequestException, Injectable } from "@nestjs/common";
+
+import { CommonMessage, DiscountMessage } from "../../../common/enums/message.enum";
+import { DanakServicesService } from "../../danak-services/providers/danak-services.service";
+import { CreateDiscountDto } from "../DTO/create-discount.dto";
+import { DiscountRepository } from "../repositories/discount.repository";
+
+@Injectable()
+export class DiscountService {
+  constructor(
+    private readonly discountRepository: DiscountRepository,
+    private readonly danakServicesService: DanakServicesService,
+  ) {}
+
+  /******************************************** */
+
+  async create(createDiscountDto: CreateDiscountDto) {
+    const { services, ...discountData } = createDiscountDto;
+
+    const code = await this.generateUniqueCouponCode();
+
+    const discount = this.discountRepository.create({
+      ...discountData,
+      code,
+    });
+
+    if (services && services.length) {
+      const foundServices = await this.danakServicesService.findServicesByIds(services);
+      discount.services = foundServices;
+    }
+    await this.discountRepository.save(discount);
+
+    return {
+      message: CommonMessage.CREATED,
+      discount,
+    };
+  }
+
+  /******************************************** */
+
+  async findAll() {
+    const services = await this.discountRepository.find({ relations: ["services"] });
+    return { services };
+  }
+
+  /******************************************** */
+
+  async findOne(id: string) {
+    const discount = await this.discountRepository.findOne({
+      where: { id },
+      relations: ["services"],
+    });
+    if (!discount) throw new BadRequestException(DiscountMessage.NOT_FOUND);
+    return { discount };
+  }
+
+  /******************************************** */
+
+  async toggleActive(id: string) {
+    const discount = await this.discountRepository.findOne({ where: { id } });
+    if (!discount) {
+      throw new BadRequestException(DiscountMessage.NOT_FOUND);
+    }
+
+    discount.isActive = !discount.isActive;
+
+    const updatedDiscount = await this.discountRepository.save(discount);
+
+    return {
+      message: CommonMessage.UPDATE_SUCCESS,
+      updatedDiscount,
+    };
+  }
+
+  /******************************************** */
+
+  async generateUniqueCouponCode(): Promise<string> {
+    const code = this.generateCouponCode();
+    const exists = await this.discountRepository.findOne({ where: { code } });
+    if (exists) return this.generateUniqueCouponCode();
+    return code;
+  }
+
+  /******************************************** */
+
+  private generateCouponCode(length = 8) {
+    return randomBytes(length).toString("hex").slice(0, length).toUpperCase();
+  }
+}