feat(nestjs): migrate to NestJS

packages/server/src/modules/Bills/commands/DeleteBill.service.ts

@@ -0,0 +1,80 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { Knex } from 'knex';
+import { events } from '@/common/events/events';
+import {
+  IBIllEventDeletedPayload,
+  IBillEventDeletingPayload,
+} from '../Bills.types';
+import { BillsValidators } from './BillsValidators.service';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { ItemEntry } from '@/modules/TransactionItemEntry/models/ItemEntry';
+import { Bill } from '../models/Bill';
+import { TenantModelProxy } from '@/modules/System/models/TenantBaseModel';
+
+@Injectable()
+export class DeleteBill {
+  constructor(
+    private readonly validators: BillsValidators,
+    private readonly uow: UnitOfWork,
+    private readonly eventPublisher: EventEmitter2,
+
+    @Inject(Bill.name)
+    private readonly billModel: TenantModelProxy<typeof Bill>,
+
+    @Inject(ItemEntry.name)
+    private readonly itemEntryModel: TenantModelProxy<typeof ItemEntry>,
+  ) {}
+
+  /**
+   * Deletes the bill with associated entries.
+   * @param {number} billId
+   * @return {void}
+   */
+  public async deleteBill(billId: number) {
+    // 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);
+
+    // Validate the given bill has no associated landed cost transactions.
+    await this.validators.validateBillHasNoLandedCost(billId);
+
+    // Validate the purchase bill has no associated payments transactions.
+    await this.validators.validateBillHasNoEntries(billId);
+
+    // Validate the given bill has no associated reconciled with vendor credits.
+    await this.validators.validateBillHasNoAppliedToCredit(billId);
+
+    // Deletes bill transaction with associated transactions under
+    // unit-of-work environment.
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Triggers `onBillDeleting` event.
+      await this.eventPublisher.emitAsync(events.bill.onDeleting, {
+        trx,
+        oldBill,
+      } as IBillEventDeletingPayload);
+
+      // Delete all associated bill entries.
+      await this.itemEntryModel()
+        .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, {
+        billId,
+        oldBill,
+        trx,
+      } as IBIllEventDeletedPayload);
+    });
+  }
+}