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

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

@@ -0,0 +1,80 @@
+import { Inject, Service } from 'typedi';
+import { Knex } from 'knex';
+import events from '@/subscribers/events';
+import {
+  IBIllEventDeletedPayload,
+  IBillEventDeletingPayload,
+} from '@/interfaces';
+import { BillsValidators } from './BillsValidators';
+import UnitOfWork from '@/services/UnitOfWork';
+import { EventPublisher } from '@/lib/EventPublisher/EventPublisher';
+import HasTenancyService from '@/services/Tenancy/TenancyService';
+
+@Service()
+export class DeleteBill {
+  @Inject()
+  private validators: BillsValidators;
+
+  @Inject()
+  private uow: UnitOfWork;
+
+  @Inject()
+  private eventPublisher: EventPublisher;
+
+  @Inject()
+  private tenancy: HasTenancyService;
+
+  /**
+   * Deletes the bill with associated entries.
+   * @param {number} billId
+   * @return {void}
+   */
+  public async deleteBill(tenantId: number, billId: number) {
+    const { ItemEntry, 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);
+
+    // Validate the givne bill has no associated landed cost transactions.
+    await this.validators.validateBillHasNoLandedCost(tenantId, billId);
+
+    // Validate the purchase bill has no assocaited payments transactions.
+    await this.validators.validateBillHasNoEntries(tenantId, billId);
+
+    // Validate the given bill has no associated reconciled with vendor credits.
+    await this.validators.validateBillHasNoAppliedToCredit(tenantId, billId);
+
+    // Deletes bill transaction with associated transactions under
+    // unit-of-work envirement.
+    return this.uow.withTransaction(tenantId, async (trx: Knex.Transaction) => {
+      // Triggers `onBillDeleting` event.
+      await this.eventPublisher.emitAsync(events.bill.onDeleting, {
+        trx,
+        tenantId,
+        oldBill,
+      } as IBillEventDeletingPayload);
+
+      // Delete all associated bill entries.
+      await ItemEntry.query(trx)
+        .where('reference_type', 'Bill')
+        .where('reference_id', billId)
+        .delete();
+
+      // Delete the bill transaction.
+      await Bill.query(trx).findById(billId).delete();
+
+      // Triggers `onBillDeleted` event.
+      await this.eventPublisher.emitAsync(events.bill.onDeleted, {
+        tenantId,
+        billId,
+        oldBill,
+        trx,
+      } as IBIllEventDeletedPayload);
+    });
+  }
+}