user/src/modules/users/domain/usecases/create-user.usecase.ts

import { Mapper } from '@automapper/core';
import { InjectMapper } from '@automapper/nestjs';
import { CommandHandler } from '@nestjs/cqrs';
import { UserMessager } from '../../adapters/secondaries/user.messager';
import { UsersRepository } from '../../adapters/secondaries/users.repository';
import { CreateUserCommand } from '../../commands/create-user.command';
import { CreateUserRequest } from '../dtos/create-user.request';
import { User } from '../entities/user';

@CommandHandler(CreateUserCommand)
export class CreateUserUseCase {
  constructor(
    private readonly _repository: UsersRepository,
    private readonly _messager: UserMessager,
    @InjectMapper() private readonly _mapper: Mapper,
  ) {}

  async execute(command: CreateUserCommand): Promise<User> {
    const entity = this._mapper.map(
      command.createUserRequest,
      CreateUserRequest,
      User,
    );

    const user = await this._repository.create(entity);

    if (user) {
      this._messager.publish('user.create', JSON.stringify(user));
    }

    return user;
  }
}