Uecko_ERP/modules/customers/src/api/application/create-customer/create-customer.use-case.ts

import { DuplicateEntityError, ITransactionManager } from "@erp/core/api";
import { CreateCustomerCommandDTO } from "@erp/customers/common/dto";
import { Result } from "@repo/rdx-utils";
import { Transaction } from "sequelize";
import { ICustomerService } from "../../domain";
import { mapDTOToCustomerProps } from "../helpers";
import { CreateCustomersAssembler } from "./assembler";

export class CreateCustomerUseCase {
  constructor(
    private readonly service: ICustomerService,
    private readonly transactionManager: ITransactionManager,
    private readonly assembler: CreateCustomersAssembler
  ) {}

  public execute(dto: CreateCustomerCommandDTO) {
    const customerPropsOrError = mapDTOToCustomerProps(dto);

    if (customerPropsOrError.isFailure) {
      return Result.fail(customerPropsOrError.error);
    }

    const { props, id } = customerPropsOrError.data;

    const customerOrError = this.service.build(props, id);

    if (customerOrError.isFailure) {
      return Result.fail(customerOrError.error);
    }

    const newCustomer = customerOrError.data;

    return this.transactionManager.complete(async (transaction: Transaction) => {
      try {
        const duplicateCheck = await this.service.existsById(id, transaction);

        if (duplicateCheck.isFailure) {
          return Result.fail(duplicateCheck.error);
        }

        if (duplicateCheck.data) {
          return Result.fail(new DuplicateEntityError("Customer", id.toString()));
        }

        const result = await this.service.save(newCustomer, transaction);
        if (result.isFailure) {
          return Result.fail(result.error);
        }

        const viewDTO = this.assembler.toDTO(newCustomer);
        return Result.ok(viewDTO);
      } catch (error: unknown) {
        return Result.fail(error as Error);
      }
    });
  }
}