订单结算修改，增加限时折扣

utils/order-utils.js

@@ -0,0 +1,152 @@
+import BigNumber from "bignumber.js";
+
+//判断商品是否可以使用限时折扣
+export function canUseLimitTimeDiscount(
+  goods,
+  limitTimeDiscountRes,
+  shopInfo,
+  shopUserInfo,
+  idKey = "id"
+) {
+  shopInfo=shopInfo||{}
+  shopUserInfo=shopUserInfo||{}
+  if (!limitTimeDiscountRes || !limitTimeDiscountRes.id) {
+    return false;
+  }
+  const canUseFoods = (limitTimeDiscountRes.foods || "").split(",");
+  if (limitTimeDiscountRes.discountPriority == "limit-time") {
+    if (
+      limitTimeDiscountRes.foodType == 1 ||
+      canUseFoods.includes("" + goods[idKey])
+    ) {
+      return true;
+    }
+  }
+  if (
+    limitTimeDiscountRes.discountPriority == "vip-price" 
+    
+  ) {
+    
+    if(shopUserInfo.isVip != 1 || shopInfo.isMemberPrice != 1){
+      return true;
+    }
+  }
+
+  return false;
+}
+
+/**
+ * 返回商品显示价格
+ * @params {*} args 参数对象
+ * @params {*} args.goods 商品对象
+ * @params {*} args.shopInfo 店铺信息
+ * @params {*} args.limitTimeDiscountRes 限时折扣信息
+ * @params {*} args.shopUserInfo 店铺用户信息
+ * @returns
+ */
+export function returnPrice(args) {
+  let {
+    goods,
+    shopInfo,
+    limitTimeDiscountRes,
+    shopUserInfo,
+    idKey = "product_id",
+  } = args;
+  const canUseFoods = (limitTimeDiscountRes.foods || "").split(",");
+  shopInfo=shopInfo||{}
+  shopUserInfo=shopUserInfo||{}
+  if (shopInfo.isMemberPrice == 1 && shopUserInfo.isVip == 1) {
+    const memberPrice = goods.memberPrice || goods.salePrice;
+
+    //是会员而且启用会员价
+    if (limitTimeDiscountRes) {
+      //使用限时折扣
+      //限时折扣优先
+      if (limitTimeDiscountRes.discountPriority == "limit-time") {
+        if (
+          limitTimeDiscountRes.foodType == 1 ||
+          canUseFoods.includes("" + goods[idKey])
+        ) {
+          return returnLimitPrice({
+            price: goods.salePrice,
+            limitTimeDiscountRes,
+          });
+        } else {
+          return memberPrice;
+        }
+      }
+      if (limitTimeDiscountRes.discountPriority == "vip-price") {
+        //会员优先
+        return memberPrice;
+      }
+    } else {
+      //是会员没有限时折扣
+      return memberPrice;
+    }
+  } else {
+    // console.log('不是会员或者没有启用会员价',goods,limitTimeDiscountRes);
+    //不是会员或者没有启用会员价
+    if (
+      limitTimeDiscountRes &&
+      limitTimeDiscountRes.id &&
+      (limitTimeDiscountRes.foodType == 1 ||
+        canUseFoods.includes("" + goods[idKey]))
+    ) {
+      const price = returnLimitPrice({
+        price: goods.salePrice,
+        limitTimeDiscountRes,
+        goods: goods,
+      });
+
+      return price;
+    } else {
+      return goods.salePrice;
+    }
+  }
+}
+
+/**
+ * 返回限时折扣价格
+ * @params {*} args 参数对象
+ * @params {*} args.limitTimeDiscountRes 限时折扣信息
+ * @params {*} args.price 商品价格
+ * @param  {*} args.goods 商品对象
+ * @returns
+ */
+export function returnLimitPrice(args) {
+  const { limitTimeDiscountRes, price, goods } = args;
+  const discountRate = new BigNumber(
+    limitTimeDiscountRes.discountRate
+  ).dividedBy(100);
+
+  const result = BigNumber(price)
+    .times(discountRate)
+    .decimalPlaces(2, BigNumber.ROUND_UP)
+    .toNumber();
+  return result;
+}
+
+/**
+ * 判断是否返回会员价
+ * @param {*} args 参数对象
+ * @param {*} args.shopInfo 店铺信息
+ * @param {*} args.shopUserInfo 店铺用户信息
+ * @returns
+ */
+export function canReturnMemberPrice(args) {
+  const { shopInfo, shopUserInfo } = args;
+  if (shopInfo.isMemberPrice == 1 && shopUserInfo.isVip == 1) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+/**
+ * 返回会员价格
+ * @param {*} goods
+ * @returns
+ */
+export function returnMemberPrice(goods) {
+  return goods.memberPrice || goods.salePrice;
+}