chore(order): preview removed items (#8680)

packages/modules/order/src/utils/actions/item-remove.ts

@@ -21,10 +21,6 @@ OrderChangeProcessing.registerActionType(ChangeActionType.ITEM_REMOVE, {
 
     setActionReference(existing, action, options)
 
-    if (MathBN.lte(existing.quantity, 0)) {
-      currentOrder.items.splice(existingIndex, 1)
-    }
-
     return MathBN.mult(existing.unit_price, action.details.quantity)
   },
   validate({ action, currentOrder }) {

packages/modules/order/src/utils/actions/item-update.ts

@@ -1,4 +1,9 @@
-import { ChangeActionType, MathBN, MedusaError } from "@medusajs/utils"
+import {
+  BigNumber,
+  ChangeActionType,
+  MathBN,
+  MedusaError,
+} from "@medusajs/utils"
 import { OrderChangeProcessing } from "../calculate-order-change"
 import { setActionReference } from "../set-action-reference"
 
@@ -17,15 +22,12 @@ OrderChangeProcessing.registerActionType(ChangeActionType.ITEM_UPDATE, {
       existing.detail.quantity
     )
 
-    existing.quantity = action.details.quantity
-    existing.detail.quantity = action.details.quantity
+    const quant = new BigNumber(action.details.quantity)
+    existing.quantity = quant
+    existing.detail.quantity = quant
 
     setActionReference(existing, action, options)
 
-    if (MathBN.lte(existing.quantity, 0)) {
-      currentOrder.items.splice(existingIndex, 1)
-    }
-
     return MathBN.mult(existing.unit_price, quantityDiff)
   },
   validate({ action, currentOrder }) {

packages/modules/order/src/utils/apply-order-changes.ts

@@ -1,6 +1,7 @@
 import { OrderChangeActionDTO } from "@medusajs/types"
 import {
   ChangeActionType,
+  MathBN,
   createRawPropertiesFromBigNumber,
   isDefined,
 } from "@medusajs/utils"
@@ -42,6 +43,10 @@ export function applyChangesToOrder(
     const version = actionsMap[order.id]?.[0]?.version ?? order.version
 
     for (const item of calculated.order.items) {
+      if (MathBN.lte(item.quantity, 0)) {
+        continue
+      }
+
       const isExistingItem = item.id === item.detail?.item_id
       const orderItem = isExistingItem ? (item.detail as any) : item
       const itemId = isExistingItem ? orderItem.item_id : item.id

packages/modules/promotion/src/utils/compute-actions/buy-get.ts

@@ -64,8 +64,11 @@ export function getComputedActionsForBuyGet(
     )
     .filter((item) => isPresent(item.subtotal) && isPresent(item.quantity))
     .sort((a, b) => {
-      const aPrice = MathBN.div(a.subtotal, a.quantity)
-      const bPrice = MathBN.div(b.subtotal, b.quantity)
+      const divA = MathBN.eq(a.quantity, 0) ? 1 : a.quantity
+      const divB = MathBN.eq(b.quantity, 0) ? 1 : b.quantity
+
+      const aPrice = MathBN.div(a.subtotal, divA)
+      const bPrice = MathBN.div(b.subtotal, divB)
 
       return MathBN.lt(bPrice, aPrice) ? -1 : 1
     })
@@ -75,10 +78,8 @@ export function getComputedActionsForBuyGet(
   for (const method of validItemsForTargetRules) {
     const appliedPromoValue = methodIdPromoValueMap.get(method.id) ?? 0
     const multiplier = MathBN.min(method.quantity, remainingQtyToApply)
-    const amount = MathBN.mult(
-      MathBN.div(method.subtotal, method.quantity),
-      multiplier
-    )
+    const div = MathBN.eq(method.quantity, 0) ? 1 : method.quantity
+    const amount = MathBN.mult(MathBN.div(method.subtotal, div), multiplier)
     const newRemainingQtyToApply = MathBN.sub(remainingQtyToApply, multiplier)
 
     if (MathBN.lt(newRemainingQtyToApply, 0) || MathBN.lte(amount, 0)) {

packages/modules/promotion/src/utils/compute-actions/shipping-methods.ts

@@ -126,11 +126,9 @@ export function applyPromotionToShippingMethods(
       const applicableTotal = method.subtotal
       const appliedPromoValue = methodIdPromoValueMap.get(method.id) ?? 0
 
+      const div = MathBN.eq(totalApplicableValue, 0) ? 1 : totalApplicableValue
       let applicablePromotionValue = MathBN.sub(
-        MathBN.mult(
-          MathBN.div(applicableTotal, totalApplicableValue),
-          promotionValue
-        ),
+        MathBN.mult(MathBN.div(applicableTotal, div), promotionValue),
         appliedPromoValue
       )