add tax to order

src/modules/order/providers/order.service.ts

@@ -1,4 +1,4 @@
-import { Injectable, NotFoundException, BadRequestException, Logger } from '@nestjs/common';
+import { Injectable, BadRequestException, Logger } from '@nestjs/common';
 import { EntityManager } from '@mikro-orm/postgresql';
 import { OrderItem } from '../entities/order-item.entity';
 import { OrderRepository } from '../repositories/order.repository';
@@ -53,7 +53,8 @@ export class OrderService {
         total: 0,
         paidAmount: 0,
         balance: 0,
-        status: OrderStatusEnum.DRAFT
+        status: OrderStatusEnum.DRAFT,
+        taxAmount: 0
       })
 
       em.persist(order)
@@ -128,7 +129,8 @@ export class OrderService {
         total,
         paidAmount: 0,
         balance: total,
-        status: OrderStatusEnum.INVOICED
+        status: OrderStatusEnum.INVOICED,
+        taxAmount: 0
       })
 
       em.persist(order)
@@ -200,7 +202,7 @@ export class OrderService {
   }
 
   async createInvoice(orderId: string, dto: CreateInvoiceDto) {
-    const { items } = dto
+    const { items, enableTax } = dto
 
     const targetOrder = await this.findOneOrFail(orderId)
 
@@ -236,8 +238,17 @@ export class OrderService {
       targetOrder.subTotal = subTotal
       targetOrder.discount = totalDiscount
 
-      targetOrder.total = subTotal - totalDiscount
-      targetOrder.balance = subTotal - totalDiscount
+      const total = subTotal - totalDiscount
+      let tax = 0
+
+      if (enableTax) {
+        tax = 0.1 * total
+      }
+
+      targetOrder.taxAmount = tax
+      targetOrder.total = total + tax
+      targetOrder.balance = total + tax
+
 
       // change status
       targetOrder.status = OrderStatusEnum.INVOICED