refactor: migrate credit note and vendor credit services to nestjs

packages/server-nest/src/modules/VendorCredit/commands/CreateVendorCredit.service.ts

@@ -0,0 +1,90 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { Knex } from 'knex';
+import {
+  IVendorCreditCreatedPayload,
+  IVendorCreditCreateDTO,
+  IVendorCreditCreatingPayload,
+} from '@/modules/VendorCredit/types/VendorCredit.types';
+import { VendorCredit } from '../models/VendorCredit';
+import { Vendor } from '@/modules/Vendors/models/Vendor';
+import { events } from '@/common/events/events';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { ItemsEntriesService } from '@/modules/Items/ItemsEntries.service';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+
+@Injectable()
+export class CreateVendorCreditService {
+  /**
+   * @param {UnitOfWork} uow - The unit of work service.
+   * @param {ItemsEntriesService} itemsEntriesService - The items entries service.
+   * @param {EventEmitter2} eventPublisher - The event emitter service.
+   * @param {typeof VendorCredit} vendorCreditModel - The vendor credit model.
+   * @param {typeof Vendor} vendorModel - The vendor model.
+   */
+  constructor(
+    private readonly uow: UnitOfWork,
+    private readonly itemsEntriesService: ItemsEntriesService,
+    private readonly eventPublisher: EventEmitter2,
+
+    @Inject(VendorCredit.name)
+    private readonly vendorCreditModel: typeof VendorCredit,
+
+    @Inject(Vendor.name) private readonly vendorModel: typeof Vendor,
+  ) {}
+
+  /**
+   * Creates a new vendor credit.
+   * @param {IVendorCreditCreateDTO} vendorCreditCreateDTO -
+   * @param {Knex.Transaction} trx -
+   */
+  public newVendorCredit = async (
+    vendorCreditCreateDTO: IVendorCreditCreateDTO,
+    trx?: Knex.Transaction,
+  ) => {
+    // Triggers `onVendorCreditCreate` event.
+    await this.eventPublisher.emitAsync(events.vendorCredit.onCreate, {
+      vendorCreditCreateDTO,
+    });
+
+    // Retrieve the given vendor or throw not found service error.
+    const vendor = await this.vendorModel
+      .query()
+      .findById(vendorCreditCreateDTO.vendorId)
+      .throwIfNotFound();
+
+    // Validate items should be sellable items.
+    await this.itemsEntriesService.validateNonSellableEntriesItems(
+      vendorCreditCreateDTO.entries,
+    );
+
+    // Transforms the credit DTO to storage layer.
+    const vendorCreditModel = this.transformCreateEditDTOToModel(
+      vendorCreditCreateDTO,
+      vendor.currencyCode,
+    );
+    // Saves the vendor credit transactions under UOW environment.
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Triggers `onVendorCreditCreating` event.
+      await this.eventPublisher.emitAsync(events.vendorCredit.onCreating, {
+        vendorCreditCreateDTO,
+        trx,
+      } as IVendorCreditCreatingPayload);
+
+      // Saves the vendor credit graph.
+      const vendorCredit = await this.vendorCreditModel
+        .query(trx)
+        .upsertGraphAndFetch({
+          ...vendorCreditModel,
+        });
+
+      // Triggers `onVendorCreditCreated` event.
+      await this.eventPublisher.emitAsync(events.vendorCredit.onCreated, {
+        vendorCredit,
+        vendorCreditCreateDTO,
+        trx,
+      } as IVendorCreditCreatedPayload);
+
+      return vendorCredit;
+    }, trx);
+  };
+}