fix order/fulfillment unit

src/pages/fulfillment/OrderFulfillmentCreate.vue

@@ -191,7 +191,7 @@ async function loadFulfillmentSkuList(): Promise<void> {
 			continue;
 		}
 		const originalUnit = getSellableUnitList(item).find(unit => unit.id === item.skuUnitId);
-		const defaultUnit = originalUnit || getSellableUnitList(item)[0];
+		const defaultUnit = getFulfillmentUnitForAvailableQuantity(item, originalUnit || getSellableUnitList(item)[0]);
 		if (defaultUnit?.id) {
 			fulfillmentUnitMap[item.id] = defaultUnit.id;
 		}
@@ -217,7 +217,26 @@ function getItemDescription(item: GaoSalesOrderItem): string {
 }
 
 function getBaseUnitName(item: GaoSalesOrderItem): string {
-	return item.skuId ? fulfillmentSkuMap[item.skuId]?.unitList?.find(unit => unit.isBase)?.name || "基础单位" : "基础单位";
+	return getBaseUnit(item)?.name || "基础单位";
+}
+
+function getBaseUnit(item: GaoSalesOrderItem): ProductSkuUnit | undefined {
+	return getSellableUnitList(item).find(unit => unit.isBase);
+}
+
+function shouldDowngradeUnit(item: GaoSalesOrderItem, unit?: ProductSkuUnit): boolean {
+	const sku = item.skuId ? fulfillmentSkuMap[item.skuId] : undefined;
+	if (!unit || unit.isBase || sku?.allowDecimalQuantity !== false) {
+		return false;
+	}
+	return Number(getAvailableBaseQuantity(item)) < Number(unit.baseQuantityPerUnit);
+}
+
+function getFulfillmentUnitForAvailableQuantity(item: GaoSalesOrderItem, unit?: ProductSkuUnit): ProductSkuUnit | undefined {
+	if (!shouldDowngradeUnit(item, unit)) {
+		return unit;
+	}
+	return getBaseUnit(item) || unit;
 }
 
 function fillAllQuantity(item: GaoSalesOrderItem): void {
@@ -242,6 +261,22 @@ function getFulfillmentUnit(item: GaoSalesOrderItem): ProductSkuUnit | undefined
 	return getSellableUnitList(item).find(unit => unit.id === fulfillmentUnitMap[item.id || ""]);
 }
 
+function setFulfillmentUnit(item: GaoSalesOrderItem, unit: ProductSkuUnit): void {
+	if (!item.id) {
+		return;
+	}
+	const currentUnit = getFulfillmentUnit(item);
+	const currentQuantity = quantityMap[item.id];
+	if (currentQuantity && currentUnit?.id !== unit.id) {
+		quantityMap[item.id] = convertPackageQuantity(
+			currentQuantity,
+			currentUnit?.baseQuantityPerUnit ?? "1",
+			unit.baseQuantityPerUnit
+		) || "";
+	}
+	fulfillmentUnitMap[item.id] = unit.id!;
+}
+
 function openUnitPicker(item: GaoSalesOrderItem): void {
 	if (!item.id) {
 		return;
@@ -257,8 +292,11 @@ function openUnitPicker(item: GaoSalesOrderItem): void {
 
 function confirmUnitPicker(value: Array<string | number>): void {
 	const skuUnitId = String(value[0] || "");
-	if (unitPickerSourceItemId.value && skuUnitId) {
-		fulfillmentUnitMap[unitPickerSourceItemId.value] = skuUnitId;
+	const item = sourceItems.value.find(sourceItem => sourceItem.id === unitPickerSourceItemId.value);
+	const selectedUnit = item ? getSellableUnitList(item).find(unit => unit.id === skuUnitId) : undefined;
+	const fulfillmentUnit = item ? getFulfillmentUnitForAvailableQuantity(item, selectedUnit) : selectedUnit;
+	if (item?.id && fulfillmentUnit?.id) {
+		setFulfillmentUnit(item, fulfillmentUnit);
 	}
 	unitPickerVisible.value = false;
 }