chore: add service to approve a invoice by user

src/modules/invoices/providers/invoices.service.ts

@@ -1,5 +1,6 @@
 import { BadRequestException, Injectable } from "@nestjs/common";
 // eslint-disable-next-line import/no-named-as-default
+import dayjs from "dayjs";
 import Decimal from "decimal.js";
 import { QueryRunner } from "typeorm";
 
@@ -59,7 +60,27 @@ export class InvoicesService {
       invoice,
     };
   }
+  ///********************************** */
 
+  async approveInvoiceByUser(invoiceId: string, userId: string) {
+    const invoice = await this.invoiceRepository.findOneBy({ id: invoiceId, user: { id: userId } });
+    if (!invoice) throw new BadRequestException(InvoiceMessage.NOT_FOUND_BY_ID);
+
+    if (invoice.status === InvoiceStatus.APPROVED) throw new BadRequestException(InvoiceMessage.ALREADY_APPROVED);
+    if (invoice.status === InvoiceStatus.PAID) throw new BadRequestException(InvoiceMessage.INVOICE_ALREADY_PAID);
+    if (dayjs().isAfter(invoice.dueDate)) throw new BadRequestException(InvoiceMessage.INVOICE_IS_OVERDUE);
+
+    if (invoice.status !== InvoiceStatus.PENDING) throw new BadRequestException(InvoiceMessage.INVOICE_CAN_NOT_APPROVED);
+
+    invoice.status = InvoiceStatus.APPROVED;
+
+    await this.invoiceRepository.save(invoice);
+
+    return {
+      message: InvoiceMessage.APPROVED,
+      invoice,
+    };
+  }
   ///********************************** */
 
   async createInvoiceForSubscription(userId: string, plan: SubscriptionPlan, dueDate: Date, queryRunner: QueryRunner) {