update order as admin

src/common/enums/message.enum.ts

@@ -730,6 +730,8 @@ export const enum OrderMessage {
   PAYMENT_METHOD_NOT_ENABLED = 'روش پرداخت برای این رستوران فعال نیست',
   PRODUCT_NOT_FOUND = 'محصول یافت نشد',
   PRODUCT_NOT_BELONGS_TO_SHOP = 'محصول به این فروشگاه تعلق ندارد',
+  ORDER_ITEM_NOT_FOUND = 'آیتم سفارش یافت نشد',
+  ORDER_NOT_EDITABLE = 'سفارش در این وضعیت قابل ویرایش نیست',
 }
 
 export const enum CartMessage {

src/modules/orders/controllers/orders.controller.ts

@@ -9,6 +9,7 @@ import { FindOrdersDto } from '../dto/find-orders.dto';
 import { OrderStatus } from '../interface/order.interface';
 import { API_HEADER_SLUG } from 'src/common/constants/index';
 import { UpdateOrderStatusDto } from '../dto/update-order-status.dto';
+import { UpdateOrderItemQuantityDto } from '../dto/update-order-item-quantity.dto';
 import { Permissions } from 'src/common/decorators/permissions.decorator';
 import { Permission } from 'src/common/enums/permission.enum';
 
@@ -94,6 +95,22 @@ export class OrdersController {
     return this.ordersService.changeOrderStatus(orderId, shopId, status, 'admin', dto?.desc);
   }
 
+  @UseGuards(AdminAuthGuard)
+  @Permissions(Permission.MANAGE_ORDERS)
+  @Patch('admin/orders/:orderId/items/:orderItemId/quantity')
+  @ApiOperation({ summary: 'Update order item quantity' })
+  @ApiParam({ name: 'orderId', description: 'Order ID' })
+  @ApiParam({ name: 'orderItemId', description: 'Order Item ID' })
+  @ApiBody({ type: UpdateOrderItemQuantityDto })
+  updateOrderItemQuantity(
+    @Param('orderId') orderId: string,
+    @Param('orderItemId') orderItemId: string,
+    @Body() dto: UpdateOrderItemQuantityDto,
+    @ShopId() shopId: string,
+  ) {
+    return this.ordersService.updateOrderItemQuantity(orderId, orderItemId, shopId, dto.quantity);
+  }
+
   @UseGuards(AdminAuthGuard)
   @Permissions(Permission.VIEW_REPORTS)
   @ApiOperation({ summary: 'Get Stats for report page' })

src/modules/orders/dto/update-order-item-quantity.dto.ts

@@ -0,0 +1,16 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { IsNotEmpty, IsNumber, Min } from 'class-validator';
+import { Type } from 'class-transformer';
+
+export class UpdateOrderItemQuantityDto {
+  @ApiProperty({
+    description: 'New quantity for the order item (supports decimals for variable products)',
+    example: 2,
+    minimum: 0.001,
+  })
+  @IsNotEmpty()
+  @Type(() => Number)
+  @IsNumber({ maxDecimalPlaces: 3 })
+  @Min(0.001)
+  quantity!: number;
+}

src/modules/orders/orders.module.ts

@@ -23,11 +23,13 @@ import { NotificationsModule } from '../notifications/notifications.module';
 import { UserModule } from '../users/user.module';
 import { ShopsModule } from '../shops/shops.module';
 import { DeliveryModule } from '../delivery/delivery.module';
- 
+import { CouponModule } from '../coupons/coupon.module';
+
 @Module({
   imports: [
     MikroOrmModule.forFeature([Order, OrderItem, User, Shop, Product, Variant, UserAddress, PaymentMethod]),
     forwardRef(() => CartModule),
+    CouponModule,
     UtilsModule,
     AuthModule,
     forwardRef(() => PaymentsModule),

src/modules/orders/providers/orders.service.ts

@@ -25,6 +25,8 @@ import { DeliveryService } from 'src/modules/delivery/providers/delivery.service
 import { PaymentMethodService } from 'src/modules/payments/services/payment-method.service';
 import { OrderItemStatus } from '../enum/order-item.enum';
 import { getMinQuantity, isValidProductQuantity, roundQuantity } from '../../products/utils/quantity.utils';
+import { CouponService } from 'src/modules/coupons/providers/coupon.service';
+import { CouponType } from 'src/modules/coupons/interface/coupon';
 
 type OrderItemData = { variant: Variant; quantity: number; unitPrice: number; discount: number };
 
@@ -61,6 +63,7 @@ export class OrdersService {
     private readonly paymentMethodService: PaymentMethodService,
     private readonly eventEmitter: EventEmitter2,
     private readonly userService: UserService,
+    private readonly couponService: CouponService,
   ) { }
 
   async checkout(userId: string, shopId: string) {
@@ -251,7 +254,153 @@ export class OrdersService {
     );
     return order;
   }
+
+  async updateOrderItemQuantity(
+    orderId: string,
+    orderItemId: string,
+    shopId: string,
+    quantity: number,
+  ): Promise<Order> {
+    const order = await this.em.findOne(
+      Order,
+      { id: orderId, shop: { id: shopId } },
+      {
+        populate: [
+          'shop',
+          'items',
+          'items.variant',
+          'items.variant.product',
+          'items.variant.product.shop',
+          'items.variant.product.variants',
+        ],
+      },
+    );
+    if (!order) {
+      throw new NotFoundException(OrderMessage.NOT_FOUND);
+    }
+
+    this.assertOrderEditable(order);
+
+    const orderItem = order.items.getItems().find(item => item.id === orderItemId);
+    if (!orderItem) {
+      throw new NotFoundException(OrderMessage.ORDER_ITEM_NOT_FOUND);
+    }
+
+    const normalizedQuantity = roundQuantity(quantity);
+    this.assertValidOrderItemQuantity(order, orderItem, shopId, normalizedQuantity);
+
+    orderItem.quantity = normalizedQuantity;
+    orderItem.totalPrice = (Number(orderItem.unitPrice) - Number(orderItem.discount)) * normalizedQuantity;
+
+    await this.recalculateOrderTotals(order);
+    await this.em.flush();
+
+    return this.findOne(orderId, shopId);
+  }
+
   /*               Helpers              */
+  private assertOrderEditable(order: Order) {
+    if ([OrderStatus.COMPLETED, OrderStatus.CANCELED].includes(order.status)) {
+      throw new BadRequestException(OrderMessage.ORDER_NOT_EDITABLE);
+    }
+  }
+
+  private assertValidOrderItemQuantity(
+    order: Order,
+    orderItem: OrderItem,
+    shopId: string,
+    quantity: number,
+  ) {
+    const variant = orderItem.variant;
+
+    if (variant.product.shop.id !== shopId) {
+      throw new BadRequestException(OrderMessage.PRODUCT_NOT_BELONGS_TO_SHOP);
+    }
+
+
+    if (quantity < getMinQuantity(variant.product)) {
+      throw new BadRequestException(CartMessage.MIN_PURCHASE_NOT_MET);
+    }
+
+  }
+
+  private async recalculateOrderTotals(order: Order): Promise<void> {
+    let subTotal = 0;
+    let itemsDiscount = 0;
+    let totalItems = 0;
+
+    for (const item of order.items.getItems()) {
+      const unitPrice = Number(item.unitPrice) || 0;
+      const unitDiscount = Math.min(Number(item.discount) || 0, unitPrice);
+      subTotal += unitPrice * item.quantity;
+      itemsDiscount += unitDiscount * item.quantity;
+      totalItems += item.quantity;
+      item.totalPrice = (unitPrice - unitDiscount) * item.quantity;
+    }
+
+    order.subTotal = subTotal;
+    order.itemsDiscount = itemsDiscount;
+    order.totalItems = totalItems;
+    order.couponDiscount = await this.calculateOrderCouponDiscount(order);
+    order.totalDiscount = order.couponDiscount + order.itemsDiscount;
+
+    const amountAfterDiscounts = Math.max(0, subTotal - order.totalDiscount);
+    const vat = order.shop?.vat ? Number(order.shop.vat) : 0;
+    order.tax = vat > 0 ? (amountAfterDiscounts * vat) / 100 : 0;
+    order.total = amountAfterDiscounts + order.tax + Number(order.deliveryFee || 0);
+  }
+
+  private async calculateOrderCouponDiscount(order: Order): Promise<number> {
+    const couponDetail = order.couponDetail;
+    if (!couponDetail) return 0;
+
+    let eligibleSubTotal = order.subTotal;
+    let eligibleItemsDiscount = order.itemsDiscount;
+
+    try {
+      const coupon = await this.couponService.findById(couponDetail.couponId);
+      const hasCategoryRestriction = (coupon.productCategories?.length ?? 0) > 0;
+      const hasFoodRestriction = (coupon.products?.length ?? 0) > 0;
+
+      if (hasCategoryRestriction || hasFoodRestriction) {
+        eligibleSubTotal = 0;
+        eligibleItemsDiscount = 0;
+
+        for (const item of order.items.getItems()) {
+          const product = item.variant.product;
+          await this.em.populate(product, ['category']);
+
+          const matchesCategory =
+            hasCategoryRestriction &&
+            product.category &&
+            (coupon.productCategories ?? []).includes(product.category.id);
+          const matchesFood = hasFoodRestriction && (coupon.products ?? []).includes(product.id);
+
+          if (matchesCategory || matchesFood) {
+            const unitPrice = Number(item.unitPrice) || 0;
+            const unitDiscount = Math.min(Number(item.discount) || 0, unitPrice);
+            eligibleSubTotal += unitPrice * item.quantity;
+            eligibleItemsDiscount += unitDiscount * item.quantity;
+          }
+        }
+      }
+    } catch {
+      // Fall back to order-wide totals when coupon lookup fails.
+    }
+
+    const priceAfterItemDiscount = Math.max(0, eligibleSubTotal - eligibleItemsDiscount);
+
+    if (couponDetail.type === CouponType.PERCENTAGE) {
+      let discount = (priceAfterItemDiscount * couponDetail.value) / 100;
+      if (couponDetail.maxDiscount && discount > couponDetail.maxDiscount) {
+        discount = couponDetail.maxDiscount;
+      }
+      return discount;
+    }
+
+    return Math.min(couponDetail.value, priceAfterItemDiscount);
+  }
+
   private assertStatusTransitionAllowed(order: Order, to: OrderStatus, ref: StatusTransitionRef) {
     const paymentMethod = order.paymentMethod?.method;
     if (!paymentMethod) {