fusenapi/utils/shopping_cart/caculate_cart_price.go

package shopping_cart

import (
	"errors"
	"fmt"
	"fusenapi/model/gmodel"
	"fusenapi/utils/format"
	"fusenapi/utils/step_price"
	"github.com/zeromicro/go-zero/core/logx"
	"math"
	"strings"
)

// 计算价格
func CaculateCartPrice(purchaseQuantity int64, productPrice *gmodel.FsProductPrice, fittingPrice int64) (ItemPrice, totalPrice int64, stepNum, stepPrice []int, err error) {
	//阶梯数量切片
	stepNum, err = format.StrSlicToIntSlice(strings.Split(*productPrice.StepNum, ","))
	if err != nil {
		logx.Error(err)
		return 0, 0, nil, nil, errors.New(fmt.Sprintf("failed to parse step number:%d_%d", *productPrice.ProductId, *productPrice.SizeId))
	}
	lenStepNum := len(stepNum)
	//阶梯价格切片
	stepPrice, err = format.StrSlicToIntSlice(strings.Split(*productPrice.StepPrice, ","))
	if err != nil {
		logx.Error(err)
		return 0, 0, nil, nil, errors.New(fmt.Sprintf("failed to parse step price:%d_%d", *productPrice.ProductId, *productPrice.SizeId))
	}
	lenStepPrice := len(stepPrice)
	if lenStepPrice == 0 || lenStepNum == 0 {
		return 0, 0, nil, nil, errors.New(fmt.Sprintf("step price or step number is not set:%d_%d", *productPrice.ProductId, *productPrice.SizeId))
	}
	//请求的数量
	reqPurchaseQuantity := purchaseQuantity
	//购买箱数
	boxQuantity := int(math.Ceil(float64(reqPurchaseQuantity) / float64(*productPrice.EachBoxNum)))
	//根据数量获取阶梯价格中对应的价格
	itemPrice := step_price.GetCentStepPrice(boxQuantity, stepNum, stepPrice)
	//如果有配件，单价也要加入配件价格
	itemPrice += fittingPrice
	//单个购物车总价
	totalPrice = itemPrice * reqPurchaseQuantity
	return itemPrice, totalPrice, stepNum, stepPrice, nil
}