refactor: split the services to multiple service classes (#202)

packages/server/src/services/Purchases/Bills/OpenBill.ts

@@ -0,0 +1,46 @@
+import moment from 'moment';
+import { Inject, Service } from 'typedi';
+import { ServiceError } from '@/exceptions';
+import { ERRORS } from './constants';
+import HasTenancyService from '@/services/Tenancy/TenancyService';
+import UnitOfWork from '@/services/UnitOfWork';
+import { BillsValidators } from './BillsValidators';
+
+@Service()
+export class OpenBill {
+  @Inject()
+  private tenancy: HasTenancyService;
+
+  @Inject()
+  private uow: UnitOfWork;
+
+  @Inject()
+  private validators: BillsValidators;
+
+  /**
+   * Mark the bill as open.
+   * @param {number} tenantId
+   * @param {number} billId
+   */
+  public async openBill(tenantId: number, billId: number): Promise<void> {
+    const { Bill } = this.tenancy.models(tenantId);
+
+    // Retrieve the given bill or throw not found error.
+    const oldBill = await Bill.query()
+      .findById(billId)
+      .withGraphFetched('entries');
+
+    // Validates the bill existance.
+    this.validators.validateBillExistance(oldBill);
+
+    if (oldBill.isOpen) {
+      throw new ServiceError(ERRORS.BILL_ALREADY_OPEN);
+    }
+    return this.uow.withTransaction(tenantId, async (trx) => {
+      // Record the bill opened at on the storage.
+      await Bill.query(trx).findById(billId).patch({
+        openedAt: moment().toMySqlDateTime(),
+      });
+    });
+  }
+}