import { Inject, Service } from 'typedi';
import { Knex } from 'knex';
import {
  ICreateTaxRateDTO,
  ITaxRateCreatedPayload,
  ITaxRateCreatingPayload,
} from '@/interfaces';
import UnitOfWork from '../UnitOfWork';
import { EventPublisher } from '@/lib/EventPublisher/EventPublisher';
import HasTenancyService from '../Tenancy/TenancyService';
import events from '@/subscribers/events';
import { CommandTaxRatesValidators } from './CommandTaxRatesValidators';

@Service()
export class CreateTaxRate {
  @Inject()
  private tenancy: HasTenancyService;

  @Inject()
  private eventPublisher: EventPublisher;

  @Inject()
  private uow: UnitOfWork;

  @Inject()
  private validators: CommandTaxRatesValidators;

  /**
   * Creates a new tax rate.
   * @param {number} tenantId
   * @param {ICreateTaxRateDTO} createTaxRateDTO
   */
  public async createTaxRate(
    tenantId: number,
    createTaxRateDTO: ICreateTaxRateDTO,
    trx?: Knex.Transaction
  ) {
    const { TaxRate } = this.tenancy.models(tenantId);

    // Validates the tax code uniquiness.
    await this.validators.validateTaxCodeUnique(
      tenantId,
      createTaxRateDTO.code,
      trx
    );
    return this.uow.withTransaction(
      tenantId,
      async (trx: Knex.Transaction) => {
        // Triggers `onTaxRateCreating` event.
        await this.eventPublisher.emitAsync(events.taxRates.onCreating, {
          createTaxRateDTO,
          tenantId,
          trx,
        } as ITaxRateCreatingPayload);

        const taxRate = await TaxRate.query(trx).insertAndFetch({
          ...createTaxRateDTO,
        });
        // Triggers `onTaxRateCreated` event.
        await this.eventPublisher.emitAsync(events.taxRates.onCreated, {
          createTaxRateDTO,
          taxRate,
          tenantId,
          trx,
        } as ITaxRateCreatedPayload);

        return taxRate;
      },
      trx
    );
  }
}