cashier-web/src/views/tool/Instead/quan_util.js

export function isTui(item) {
  return item.status == "return" || item.status == "refund" || item.status == "refunding";
}
//是否使用会员价
export function isUseVipPrice(vipUser, goods) {
  return vipUser.id && vipUser.isVip;
}

//计算商品券优惠价格
export function returnProductCouponPrice(coup, goodsArr, vipUser) {
  const item = goodsArr.find((v) => v.productId == coup.proId);
  if (!item) {
    return 0;
  }
  const memberPrice = item.memberPrice ? item.memberPrice : item.price;
  const price = item ? (isUseVipPrice(vipUser, item) ? memberPrice : item.price) : 0;
  return price * coup.num;
}
//返回新的商品列表，过滤掉退菜的，退单的商品
export function returnNewGoodsList(arr) {
  let goodsMap = {};
  return arr.filter((v) => !isTui(v));
}
//根据当前购物车商品以及数量,已选券对应商品数量，判断该商品券是否可用
export function returnCoupCanUse(goodsArr = [], coup, selCoupArr = []) {
  // if(!coup.use){
  // 	return false
  // }
  const findGoods = goodsArr.filter((v) => v.productId == coup.proId);
  if (!findGoods.length) {
    return false;
  }
  const findGoodsTotalNumber = findGoods.reduce((prve, cur) => {
    return prve + cur.num * 1;
  }, 0);
  const selCoupNumber = selCoupArr
    .filter((v) => v.proId == coup.proId)
    .reduce((prve, cur) => {
      return prve + cur.num * 1;
    }, 0);
  if (selCoupNumber >= findGoodsTotalNumber) {
    return false;
  }
  return findGoodsTotalNumber < selCoupNumber ? false : true;
}
//查找购物车商品根据购物车商品数据返回商品券信息（抵扣价格以及是否满足可用需求）
export function returnProductCoupon(coup, goodsArr, vipUser, selCoupArr = []) {
  const newGoodsArr = returnNewGoodsList(goodsArr);
  const item = newGoodsArr.find((v) => v.productId == coup.proId);
  if (!item) {
    return {
      ...coup,
      discountAmount: 0,
      use: false,
    };
  }
  const memberPrice = item.memberPrice ? item.memberPrice : item.price;
  const price = item ? (isUseVipPrice(vipUser, item) ? memberPrice : item.price) : 0;
  const discountAmount = (price * coup.num).toFixed(2);
  // const canUse = !coup.use ? false : (discountAmount > 0 && returnCoupCanUse(goodsArr, coup, selCoupArr))
  // const canUse=discountAmount>0
  const canUse = coup.use;
  return {
    ...coup,
    discountAmount: discountAmount,
    use: canUse,
  };
}
/**
 * 根据购物车商品计算商品券抵扣价格以及是否满足可用需求
 * 1.商品券对应商品数量大于购物车对应商品数量不可用
 * 2.未在购物车找到相关商品不可用
 * @param {*} coupArr
 * @param {*} goodsArr
 * @param {*} vipUser
 * @returns
 */
export function returnProductAllCoup(coupArr, goodsArr, vipUser) {
  return coupArr.map((v) => {
    return returnProductCoupon(v, goodsArr, vipUser);
  });
}
//返回商品实际支付价格
export function returnProductPayPrice(goods, vipUser) {
  const memberPrice = goods.memberPrice ? goods.memberPrice : goods.price;
  const price = isUseVipPrice(vipUser, goods) ? memberPrice : goods.price;
  return price;
}
//返回商品券抵扣的商品价格
export function returnProductCoupAllPrice(productPriceArr, startIndex, num = 1, isVip = true) {
  num = num || 1;
  return productPriceArr.slice(startIndex, startIndex + num).reduce((prve, cur) => {
    let curPrice = 0;
    if (typeof cur === "object") {
      curPrice = isVip ? cur.memberPrice * 1 : cur.price;
    } else {
      curPrice = cur * 1;
    }

    return prve + curPrice;
  }, 0);
}

//返回商品券可抵扣的商品数量
export function returnProductCanUseNum(productPriceArr, startIndex, num) {
  let n = 0;
  for (let i = 0; i < num; i++) {
    if (productPriceArr[startIndex * 1 + i]) {
      n += 1;
    } else {
      break;
    }
  }
  return n;
}

//返回同类商品券在同类商品价格数组里的开始位置
export function returnProCoupStartIndex(coupArr, index) {
  return coupArr.slice(0, index).reduce((prve, cur) => {
    return prve + cur.num * 1;
  }, 0);
}
//返回商品数量从0到n每一个对应的价格对照表
export function returnGoodsPayPriceMap(goodsArr) {
  return goodsArr.reduce((prve, cur) => {
    if (!prve.hasOwnProperty(cur.productId)) {
      prve[cur.productId] = [];
    }
    const arr = new Array(cur.num).fill(cur).map((v) => {
      return {
        memberPrice: v.memberPrice ? v.memberPrice : v.price,
        price: v.price,
      };
    });
    prve[cur.productId].push(...arr);
    return prve;
  }, {});
}
//计算商品券总优惠价格
export function returnProductCouponAllPrice(coupArr, goodsArr, vipUser) {
  if (coupArr.length == 0) {
    return 0;
  }
  //商品分组
  const goodsMap = {};
  //商品数量从0到n每一个对应的价格
  const goodsPayPriceMap = {};
  //商品券分组
  let coupMap = {};
  for (let i in coupArr) {
    const coup = coupArr[i];
    if (coupMap.hasOwnProperty(coup.proId)) {
      coupMap[coup.proId].push(coup);
    } else {
      coupMap[coup.proId] = [coup];
    }
  }
  let total = 0;
  for (let key in coupMap) {
    const arr = coupMap[key];
    for (let i in arr) {
      const coup = arr[i];
      if (!goodsMap.hasOwnProperty(coup.proId)) {
        goodsMap[coup.proId] = goodsArr
          .filter((v) => v.productId == coup.proId)
          .map((v) => {
            return {
              ...v,
              payPrice: returnProductPayPrice(v, vipUser),
            };
          })
          .sort((a, b) => {
            const aPrice = a.payPrice;
            const bPrice = b.payPrice;
            return aPrice - bPrice;
          });
        goodsPayPriceMap[coup.proId] = goodsMap[coup.proId].reduce((prve, cur) => {
          const arr = new Array(cur.num).fill(cur.payPrice);
          prve.push(...arr);
          return prve;
        }, []);
      }
      const proCoupStartIndex = returnProCoupStartIndex(arr, i);
      const coupNum = Math.min(goodsPayPriceMap[coup.proId].length, coup.num);
      total += returnProductCoupAllPrice(goodsPayPriceMap[coup.proId], proCoupStartIndex, coupNum);
    }
  }

  return total.toFixed(2);
}
//计算满减券总优惠价格
export function returnFullReductionCouponAllPrice(coupArr) {
  if (coupArr.length == 0) {
    return 0;
  }
  return coupArr
    .filter((v) => v.type == 1)
    .reduce((a, b) => {
      const price = b.discountAmount;
      return a + price;
    }, 0)
    .toFixed(2);
}
//计算优惠券总价格
export function returnCouponAllPrice(coupArr, goodsArr, vipUser) {
  const poductAllprice = returnProductCouponAllPrice(coupArr, goodsArr, vipUser);
  const pointAllPrice = returnFullReductionCouponAllPrice(coupArr);
  return (poductAllprice * 1 + pointAllPrice * 1).toFixed(2);
}

//返回当前满减券列表可用状态
export function returnCanUseFullReductionCoupon(coupArr, payPrice, selCoup) {
  return coupArr
    .map((v) => {
      if (v.id == selCoup.id) {
        return { ...v, use: true };
      }
      const isfullAmount = payPrice * 1 >= v.fullAmount * 1;
      if (payPrice <= 0) {
        return {
          ...v,
          use: false,
        };
      }
      return {
        ...v,
        use: v.use && isfullAmount,
      };
    })
    .filter((v) => v.use);
}

//根据商品数量还有商品券数量返回优惠券可以使用的数量数组
export function returnCanUseNumProductCoup(coupArr) {
  let productCoup = coupArr.filter((v) => v.type == 2);
  //商品券分组
  let coupMap = {};
  for (let i in productCoup) {
    const coup = productCoup[i];
    if (coupMap.hasOwnProperty(coup.proId)) {
      coupMap[coup.proId].push(coup);
    } else {
      coupMap[coup.proId] = [coup];
    }
  }
  return arr;
}