chore: complete create discount

src/app.module.ts

@@ -17,6 +17,7 @@ import { AuthModule } from "./modules/auth/auth.module";
 import { ContactUsModule } from "./modules/contact-us/contact-us.module";
 import { CriticismModule } from "./modules/criticisms/criticisms.module";
 import { DanakServicesModule } from "./modules/danak-services/danak-services.module";
+import { DiscountModule } from "./modules/discounts/discounts.module";
 import { InvoicesModule } from "./modules/invoices/invoices.module";
 import { LearningModule } from "./modules/learnings/learning.module";
 import { NotificationModule } from "./modules/notifications/notifications.module";
@@ -52,6 +53,7 @@ import { WalletsModule } from "./modules/wallets/wallets.module";
     InvoicesModule,
     SubscriptionsModule,
     LearningModule,
+    DiscountModule,
   ],
   controllers: [],
   providers: [],

src/common/enums/message.enum.ts

@@ -330,3 +330,25 @@ export const enum LearningMessage {
   CATEGORY_MUST_BE_ID = "دسته‌بندی باید شناسه باشد",
   CATEGORY_MUST_BE_UUID = "دسته‌بندی باید UUID باشد",
 }
+
+export const enum DiscountMessage {
+  TYPE_REQUIRED = "وارد کردن نوع تخفیف الزامی است",
+  TYPE_INVALID = "نوع تخفیف نامعتبر است",
+  CALCULATION_TYPE_REQUIRED = "وارد کردن نوع محاسبه تخفیف الزامی است",
+  CALCULATION_TYPE_INVALID = "نوع محاسبه تخفیف نامعتبر است",
+  AMOUNT_REQUIRED = "وارد کردن مقدار تخفیف الزامی است",
+  AMOUNT_INVALID = "مقدار تخفیف باید عدد باشد",
+  TITLE_REQUIRED = "وارد کردن مقدار عنوان الزامی است",
+  TITLE_INVALID = "مقدار عنوان باید یک رشته باشد",
+  CODE_REQUIRED = "وارد کردن کد تخفیف الزامی است",
+  CODE_INVALID = "کد تخفیف نامعتبر است",
+  START_DATE_REQUIRED = "وارد کردن تاریخ شروع الزامی است",
+  START_DATE_INVALID = "تاریخ شروع نامعتبر است",
+  END_DATE_REQUIRED = "وارد کردن تاریخ پایان الزامی است",
+  END_DATE_INVALID = "تاریخ پایان نامعتبر است",
+  SERVICES_INVALID = "لیست خدمات باید آرایه‌ای از اعداد باشد",
+  SERVICES_DUPLICATE = "خدمات نباید تکراری باشند",
+  SERVICES_UUID_INVALID = "ایدی سرویس معتبرنیست",
+  NOT_FOUND = "کد تخفیف با این مشخصات یافت نشد",
+  CODE_EXIST = "کد تخفیف قبلا ایجاد شده است",
+}

src/modules/danak-services/entities/danak-service.entity.ts

@@ -1,9 +1,10 @@
-import { Column, Entity, ManyToOne, OneToMany } from "typeorm";
+import { Column, Entity, ManyToMany, ManyToOne, OneToMany } from "typeorm";
 
 import { DanakServiceCategory } from "./danak-service-category.entity";
 import { DanakServiceImage } from "./danak-service-image.entity";
 import { BaseEntity } from "../../../common/entities/base.entity";
 import { Announcement } from "../../announcements/entities/announcement.entity";
+import { Discount } from "../../discounts/entities/discount.entity";
 import { SubscriptionPlan } from "../../subscriptions/entities/subscription.entity";
 import { Ticket } from "../../tickets/entities/ticket.entity";
 import { ServicesLanguage } from "../enums/services-language.enum";
@@ -63,6 +64,9 @@ export class DanakService extends BaseEntity {
 
   @OneToMany(() => SubscriptionPlan, (plan) => plan.service, { cascade: true })
   subscriptionPlans: SubscriptionPlan[];
+
+  @ManyToMany(() => Discount, (discount) => discount.services, { nullable: true })
+  discounts?: Discount[];
 }
 
 // @ManyToMany(() => User, (user) => user.danakServices)

src/modules/danak-services/providers/danak-services.service.ts

@@ -1,5 +1,5 @@
 import { BadRequestException, Injectable } from "@nestjs/common";
-import { FindOptionsWhere, IsNull } from "typeorm";
+import { FindOptionsWhere, In, IsNull } from "typeorm";
 
 import { ParamDto } from "../../../common/DTO/param.dto";
 import { CategoryMessage, CommonMessage, ServiceMessage } from "../../../common/enums/message.enum";
@@ -200,4 +200,54 @@ export class DanakServicesService {
   }
 
   /******************************************** */
+
+  async findServicesByIds(ids: string[]) {
+    const services = await this.danakServicesRepository.findBy({ id: In(ids) });
+    return services;
+  }
+
+  /******************************************** */
+
+  // async getDiscountedPrice(serviceId: string) {
+  //   const service = await this.danakServicesRepository.findOne({
+  //     where: {
+  //       id: serviceId,
+  //     },
+  //     relations: ["discount"],
+  //   });
+  //   if (!service) throw new BadRequestException(ServiceMessage.SERVICE_NOT_FOUND_BY_ID);
+
+  //   const now = new Date();
+
+  //   const serviceDiscount = service.discounts.filter(
+  //     (d) => d.type === DiscountType.DIRECT && d.isActive && d.startDate <= now && d.endDate >= now,
+  //   );
+
+  //   const globalDiscounts = await this.discountRepository
+  //     .createQueryBuilder("discount")
+  //     .leftJoin("discount.services", "service")
+  //     .where("discount.type = :discountType", { discountType: DiscountType.DIRECT })
+  //     .andWhere("discount.isActive = true")
+  //     .andWhere("discount.startDate <= :now", { now })
+  //     .andWhere("discount.endDate >= :now", { now })
+  //     .andWhere("service.id IS NULL")
+  //     .getMany();
+
+  //   const applicableDiscounts = [...serviceDiscount, ...globalDiscounts];
+  //   if (applicableDiscounts.length === 0) return service.;
+  //   let maxDiscountValue = 0;
+  //   for (const discount of applicableDiscounts) {
+  //     let discountValue = 0;
+  //     if (discount.calculationType === DiscountCalculationType.FIXED) {
+  //       discountValue = discount.amount;
+  //     } else if (discount.calculationType === DiscountCalculationType.PERCENTAGE) {
+  //       discountValue = service.price * (discount.amount / 100);
+  //     }
+  //     if (discountValue > maxDiscountValue) {
+  //       maxDiscountValue = discountValue;
+  //     }
+  //   }
+  //   const discountedPrice = service.price - maxDiscountValue;
+  //   return discountedPrice > 0 ? discountedPrice : 0;
+  // }
 }

src/modules/discounts/DTO/create-discount.dto.ts

@@ -0,0 +1,44 @@
+import { ApiProperty, ApiPropertyOptional } from "@nestjs/swagger";
+import { ArrayUnique, IsArray, IsDateString, IsEnum, IsNotEmpty, IsNumber, IsOptional, IsString, IsUUID } from "class-validator";
+
+import { DiscountMessage } from "../../../common/enums/message.enum";
+import { DiscountCalculationType, DiscountType } from "../enums/discount-type.enum";
+
+export class CreateDiscountDto {
+  @ApiProperty({ description: "title of discount", type: String, example: "discount 1" })
+  @IsNotEmpty({ message: DiscountMessage.TITLE_REQUIRED })
+  @IsString({ message: DiscountMessage.TITLE_INVALID })
+  title: string;
+
+  @ApiProperty({ description: "discount type", enum: DiscountType, example: DiscountType.CODE })
+  @IsNotEmpty({ message: DiscountMessage.TYPE_REQUIRED })
+  @IsEnum(DiscountType, { message: DiscountMessage.TYPE_INVALID })
+  type: DiscountType;
+
+  @ApiProperty({ description: "calculation type", enum: DiscountCalculationType, example: DiscountCalculationType.FIXED })
+  @IsNotEmpty({ message: DiscountMessage.CALCULATION_TYPE_REQUIRED })
+  @IsEnum(DiscountCalculationType, { message: DiscountMessage.CALCULATION_TYPE_INVALID })
+  calculationType: DiscountCalculationType;
+
+  @ApiProperty({ description: "amount of discount", type: Number, example: 100 })
+  @IsNotEmpty({ message: DiscountMessage.AMOUNT_REQUIRED })
+  @IsNumber({}, { message: DiscountMessage.AMOUNT_INVALID })
+  amount: number;
+
+  @ApiProperty({ description: "start discount date", type: String, format: "date-time", example: "2025-01-01T00:00:00Z" })
+  @IsNotEmpty({ message: DiscountMessage.START_DATE_REQUIRED })
+  @IsDateString({}, { message: DiscountMessage.START_DATE_INVALID })
+  startDate: string;
+
+  @ApiProperty({ description: "end discount date", type: String, format: "date-time", example: "2025-12-31T23:59:59Z" })
+  @IsNotEmpty({ message: DiscountMessage.END_DATE_REQUIRED })
+  @IsDateString({}, { message: DiscountMessage.END_DATE_INVALID })
+  endDate: string;
+
+  @ApiPropertyOptional({ description: "لیست آیدی‌های خدمات", type: [String], example: ["f47ac10b-58cc-4372-a567-0e02b2c3d479"] })
+  @IsOptional()
+  @IsArray({ message: DiscountMessage.SERVICES_INVALID })
+  @ArrayUnique({ message: DiscountMessage.SERVICES_DUPLICATE })
+  @IsUUID("4", { each: true, message: DiscountMessage.SERVICES_UUID_INVALID })
+  services?: string[];
+}

src/modules/discounts/discounts.controller.ts

@@ -0,0 +1,54 @@
+import { Body, Controller, Get, Param, Patch, Post } from "@nestjs/common";
+import { ApiOperation, ApiTags } from "@nestjs/swagger";
+
+import { CreateDiscountDto } from "./DTO/create-discount.dto";
+import { DiscountService } from "./providers/discounts.service";
+import { AuthGuards } from "../../common/decorators/auth-guard.decorator";
+import { Roles } from "../../common/decorators/roles.decorator";
+import { ParamDto } from "../../common/DTO/param.dto";
+import { RoleEnum } from "../users/enums/role.enum";
+
+@ApiTags("discounts")
+@AuthGuards()
+@Controller("discounts")
+export class DiscountController {
+  constructor(private readonly discountService: DiscountService) {}
+
+  //************************************ */
+
+  @ApiOperation({ summary: "Create a new discount" })
+  @Roles(RoleEnum.ADMIN)
+  @Post()
+  async create(@Body() createDiscountDto: CreateDiscountDto) {
+    return this.discountService.create(createDiscountDto);
+  }
+
+  //************************************ */
+
+  @ApiOperation({ summary: "Retrieve all discounts" })
+  @Roles(RoleEnum.ADMIN)
+  @Get()
+  async findAll() {
+    return this.discountService.findAll();
+  }
+
+  //************************************ */
+
+  @ApiOperation({ summary: "Retrieve a discount by ID" })
+  @Roles(RoleEnum.ADMIN)
+  @Get(":id")
+  async findOne(@Param() paramDto: ParamDto) {
+    return this.discountService.findOne(paramDto.id);
+  }
+
+  //************************************ */
+
+  @ApiOperation({ summary: "Toggle active/deactive discount" })
+  @Roles(RoleEnum.ADMIN)
+  @Patch(":id/toggle")
+  async toggleActive(@Param() paramDto: ParamDto) {
+    return this.discountService.toggleActive(paramDto.id);
+  }
+
+  //************************************ */
+}

src/modules/discounts/discounts.module.ts

@@ -0,0 +1,15 @@
+import { Module } from "@nestjs/common";
+import { TypeOrmModule } from "@nestjs/typeorm";
+
+import { DiscountController } from "./discounts.controller";
+import { Discount } from "./entities/discount.entity";
+import { DiscountService } from "./providers/discounts.service";
+import { DiscountRepository } from "./repositories/discount.repository";
+import { DanakServicesModule } from "../danak-services/danak-services.module";
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Discount]), DanakServicesModule],
+  providers: [DiscountService, DiscountRepository],
+  controllers: [DiscountController],
+})
+export class DiscountModule {}

src/modules/discounts/entities/discount.entity.ts

@@ -0,0 +1,38 @@
+import Decimal from "decimal.js";
+import { Column, Entity, JoinTable, ManyToMany } from "typeorm";
+
+import { BaseEntity } from "../../../common/entities/base.entity";
+import { DecimalTransformer } from "../../../common/transformers/decimal.transformer";
+import { DanakService } from "../../danak-services/entities/danak-service.entity";
+import { DiscountCalculationType, DiscountType } from "../enums/discount-type.enum";
+
+@Entity()
+export class Discount extends BaseEntity {
+  @Column({ type: "varchar", length: 200, nullable: false })
+  title: string;
+
+  @Column({ type: "enum", enum: DiscountType })
+  type: DiscountType;
+
+  @Column({ type: "enum", enum: DiscountCalculationType })
+  calculationType: DiscountCalculationType;
+
+  @Column({ type: "decimal", precision: 10, scale: 2, nullable: false, transformer: new DecimalTransformer() })
+  amount: Decimal;
+
+  @Column({ type: "boolean", default: true })
+  isActive: boolean;
+
+  @Column({ nullable: true })
+  code?: string;
+
+  @Column({ type: "timestamptz" })
+  startDate: Date;
+
+  @Column({ type: "timestamptz" })
+  endDate: Date;
+
+  @ManyToMany(() => DanakService, (danakService) => danakService.discounts, { nullable: true })
+  @JoinTable()
+  services?: DanakService[];
+}

src/modules/discounts/enums/discount-type.enum.ts

@@ -0,0 +1,9 @@
+export enum DiscountType {
+  DIRECT = "DIRECT",
+  CODE = "CODE",
+}
+
+export enum DiscountCalculationType {
+  FIXED = "FIXED",
+  PERCENTAGE = "PERCENTAGE",
+}

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();
+  }
+}

src/modules/discounts/repositories/discount.repository.ts

@@ -0,0 +1,12 @@
+import { Injectable } from "@nestjs/common";
+import { InjectRepository } from "@nestjs/typeorm";
+import { Repository } from "typeorm";
+
+import { Discount } from "../entities/discount.entity";
+
+@Injectable()
+export class DiscountRepository extends Repository<Discount> {
+  constructor(@InjectRepository(Discount) discountRepository: Repository<Discount>) {
+    super(discountRepository.target, discountRepository.manager, discountRepository.queryRunner);
+  }
+}