refactor: wip to nestjs

packages/server-nest/src/modules/Bills/commands/OpenBill.service.ts

@@ -0,0 +1,65 @@
+import moment from 'moment';
+import { Inject, Injectable } from '@nestjs/common';
+import { ERRORS } from '../Bills.constants';
+import { BillsValidators } from './BillsValidators.service';
+import { IBillOpenedPayload, IBillOpeningPayload } from '../Bills.types';
+import { Bill } from '../models/Bill';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { ServiceError } from '@/modules/Items/ServiceError';
+import { events } from '@/common/events/events';
+
+@Injectable()
+export class OpenBillService {
+  constructor(
+    private readonly uow: UnitOfWork,
+    private readonly validators: BillsValidators,
+    private readonly eventPublisher: EventEmitter2,
+
+    @Inject(Bill.name)
+    private readonly billModel: typeof Bill,
+  ) {}
+
+  /**
+   * Mark the bill as open.
+   * @param {number} billId - Bill id.
+   * @return {Promise<void>}
+   */
+  public async openBill(billId: number): Promise<void> {
+    // Retrieve the given bill or throw not found error.
+    const oldBill = await this.billModel
+      .query()
+      .findById(billId)
+      .withGraphFetched('entries');
+
+    // Validates the bill existence.
+    this.validators.validateBillExistance(oldBill);
+
+    if (oldBill.isOpen) {
+      throw new ServiceError(ERRORS.BILL_ALREADY_OPEN);
+    }
+
+    return this.uow.withTransaction(async (trx) => {
+      // Triggers `onBillCreating` event.
+      await this.eventPublisher.emitAsync(events.bill.onOpening, {
+        oldBill,
+        trx,
+      } as IBillOpeningPayload);
+
+      // Save the bill opened at on the storage.
+      const bill = await this.billModel
+        .query(trx)
+        .patchAndFetchById(billId, {
+          openedAt: moment().toMySqlDateTime(),
+        })
+        .withGraphFetched('entries');
+
+      // Triggers `onBillCreating` event.
+      await this.eventPublisher.emitAsync(events.bill.onOpened, {
+        bill,
+        oldBill,
+        trx,
+      } as IBillOpenedPayload);
+    });
+  }
+}