feat(nestjs): migrate to NestJS

packages/server/src/modules/SaleEstimates/queries/GetSaleEstimate.service.ts

@@ -0,0 +1,52 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { SaleEstimateTransfromer } from './SaleEstimate.transformer';
+import { SaleEstimateValidators } from '../commands/SaleEstimateValidators.service';
+import { TransformerInjectable } from '@/modules/Transformer/TransformerInjectable.service';
+import { SaleEstimate } from '../models/SaleEstimate';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { events } from '@/common/events/events';
+import { TenantModelProxy } from '@/modules/System/models/TenantBaseModel';
+
+@Injectable()
+export class GetSaleEstimate {
+  constructor(
+    @Inject(SaleEstimate.name)
+    private readonly saleEstimateModel: TenantModelProxy<typeof SaleEstimate>,
+
+    private readonly transformer: TransformerInjectable,
+    private readonly validators: SaleEstimateValidators,
+    private readonly eventPublisher: EventEmitter2,
+  ) {}
+
+  /**
+   * Retrieve the estimate details with associated entries.
+   * @async
+   * @param {Integer} estimateId
+   */
+  public async getEstimate(estimateId: number) {
+    const estimate = await this.saleEstimateModel()
+      .query()
+      .findById(estimateId)
+      .withGraphFetched('entries.item')
+      .withGraphFetched('customer')
+      .withGraphFetched('branch')
+      .withGraphFetched('attachments');
+
+    // Validates the estimate existance.
+    this.validators.validateEstimateExistance(estimate);
+
+    // Transformes sale estimate model to POJO.
+    const transformed = await this.transformer.transform(
+      estimate,
+      new SaleEstimateTransfromer(),
+    );
+    const eventPayload = { saleEstimateId: estimateId };
+
+    // Triggers `onSaleEstimateViewed` event.
+    await this.eventPublisher.emitAsync(
+      events.saleEstimate.onViewed,
+      eventPayload,
+    );
+    return transformed;
+  }
+}