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

packages/server/src/services/Sales/Invoices/GetSaleInvoicesPayable.ts

@@ -0,0 +1,31 @@
+import { Inject, Service } from 'typedi';
+import { ISaleInvoice } from '@/interfaces';
+import HasTenancyService from '@/services/Tenancy/TenancyService';
+
+@Service()
+export class GetSaleInvoicesPayable {
+  @Inject()
+  private tenancy: HasTenancyService;
+
+  /**
+   * Retrieve due sales invoices.
+   * @param {number} tenantId
+   * @param {number} customerId
+   */
+  public async getPayableInvoices(
+    tenantId: number,
+    customerId?: number
+  ): Promise<ISaleInvoice> {
+    const { SaleInvoice } = this.tenancy.models(tenantId);
+
+    const salesInvoices = await SaleInvoice.query().onBuild((query) => {
+      query.modify('dueInvoices');
+      query.modify('delivered');
+
+      if (customerId) {
+        query.where('customer_id', customerId);
+      }
+    });
+    return salesInvoices;
+  }
+}