/**
 * 计算佣金
 * 2020/05/22
 */
package ordercalc

import (
	"errors"

	"strings"
)

/**
 * 计算某一商品对分销商的分销价
 * @param business 分销商信息
 * @param productSpecialPrice 分销特殊价格
 * @param distributionPrice 基础分销价
 * @param percentage 分销比例
 * @param productPrice 商品销售价
 * 2020/05/22
 * gz
 */
func DistributionPrice(business map[string]string, productSpecialPrice []map[string]string, distributionPrice interface{}, percentAge interface{}, productPrice interface{}) (float64, error) {

	product_price := ToString(productPrice)

	if len(business) < 1 {
		return 0, errors.New("参数错误")
	}

	_, idExist := business["Id"]
	_, levelIdExist := business["LevelId"]
	if !idExist || !levelIdExist {
		return 0, errors.New("分销商参数错误")
	}

	distribution_price := ToString(distributionPrice)
	distribution_price_float, err := ToFloat64(distributionPrice)
	if err != nil {
		return 0, err
	}

	percent_age := ToString(percentAge)

	if len(productSpecialPrice) < 1 && percent_age == "" {
		return distribution_price_float, nil //没有特殊价格，没有分销比例，返回原分销价
	}

	var formula string                //分销价计算公式
	var is_special_price bool = false //是否使用特殊价格方式，因特殊价格中可能只能会员价，记录以供再次判断

	var ok bool

	if len(productSpecialPrice) > 0 { //特殊价格方式
		is_special_price = true //有一条特殊价格，则是使用特殊价
		for _, item := range productSpecialPrice {
			if _, ok = item["BusinessId"]; ok {
				if item["BusinessId"] != "0" && item["BusinessId"] == business["Id"] {
					formula = item["DistributionPrice"]
					break
				}
			}
			if _, ok = item["BusinessLevelId"]; ok {
				if item["BusinessLevelId"] != "0" && item["BusinessLevelId"] == business["LevelId"] {
					formula = item["DistributionPrice"]
				}
			}
		}
	}

	var price []string
	var result float64 = 0 //最终分销价

	if is_special_price {

		if formula != "" {
			formula = strings.Replace(formula, "#distribution_price#", distribution_price, 1)
		} else {
			formula = distribution_price
		}

		//计算表达式

		switch {
		case strings.Contains(formula, "+"):
			price = strings.Split(formula, "+")
			result = FloatAdd(price[0], price[1])
		case strings.Contains(formula, "-"):
			price = strings.Split(formula, "-")
			result = FloatSub(price[0], price[1])
		case strings.Contains(formula, "*"):
			price = strings.Split(formula, "*")
			result = FloatMul(price[0], price[1], 2)
		case strings.Contains(formula, "/"):
			price = strings.Split(formula, "/")
			result = FloatQuo(price[0], price[1], 2)
		default:
			//使用固定价格或者使用基础分销价
			if formula != "" {
				result, _ = ToFloat64(formula)
			} else {
				result = distribution_price_float
			}
		}
	} else {
		//使用分销比例
		if product_price == "" {
			return 0, errors.New("商品价格错误")
		}
		price = strings.Split(percent_age, ":")
		totalCommission := FloatSub(productPrice, distributionPrice) //总佣金

		if totalCommission <= 0 {
			return ToFloat64(productPrice) //总佣金为负，返回商品原价
		}

		if _, ok = business["Grade"]; ok {
			level_count := len(price)                  //分销级数
			var totalPercent, cent, commission float64 //总分配份数,分销比例,获得的佣金
			switch level_count {
			case 3:
				totalPercent = FloatAdd(price[0], price[1], price[2])
				if totalPercent <= 0 {
					result = distribution_price_float //佣金分配比例为0，返回基础分销价
				} else {
					switch business["Grade"] {
					case "1":
						//一级分销商得到所有佣金
						cent = 1 //分销比例
					case "2":
						//二级分销商得到所有佣金
						cent = FloatQuo(FloatAdd(price[0], price[1]), totalPercent) //分销比例
					case "0", "3":
						//三级或无级别分销商得到所有佣金
						cent = FloatQuo(price[0], totalPercent) //分销比例
					}
					commission = FloatMul(totalCommission, cent, 2)

					result = FloatSub(productPrice, commission) //分销价＝商品价－佣金
				}
			case 2:
				totalPercent = FloatAdd(price[0], price[1])
				if totalPercent <= 0 {
					result = distribution_price_float //佣金分配比例为0，返回基础分销价
				} else {
					switch business["Grade"] {
					case "1":
						//一级分销商得到所有佣金
						cent = 1 //分销比例
					case "0", "2":
						//二级或无级别分销商得到所有佣金
						cent = FloatQuo(price[0], totalPercent) //分销比例
					}
					commission = FloatMul(totalCommission, cent, 2)
					result = FloatSub(productPrice, commission) //分销价＝商品价－佣金
				}
			case 1:
				//只有一级
				result = distribution_price_float
			}

		} else {
			return 0, errors.New("分销商参数错误，没有分销级别")
		}
	}

	if result < 0 {
		result, _ = ToFloat64(productPrice)
	}
	return result, nil
}

/**
 * 计算某一商品的VIP价
 * @param productSpecialPrice 特殊价格
 * @param productPrice 商品销售价
 * 2020/06/05
 * gz
 */
func VipPrice(productSpecialPrice []map[string]string, productPrice interface{}) (float64, error) {

	product_price := ToString(productPrice)

	product_price_float, _ := ToFloat64(productPrice)

	if len(productSpecialPrice) < 1 {
		return product_price_float, nil //没有特殊价格，返回原价
	}

	var formula string //VIP价计算公式

	var ok bool

	for _, item := range productSpecialPrice {

		if _, ok = item["RetailPrice"]; ok {
			if item["RetailPrice"] != "" {
				formula = item["RetailPrice"]
				break
			}
		}
	}

	if formula != "" {
		formula = strings.Replace(formula, "#retail_price#", product_price, 1)
	} else {
		formula = product_price
	}
	//计算表达式

	var price []string
	var result float64 = 0 //最终VIP价
	switch {
	case strings.Contains(formula, "+"):
		price = strings.Split(formula, "+")
		result = FloatAdd(price[0], price[1])
	case strings.Contains(formula, "-"):
		price = strings.Split(formula, "-")
		result = FloatSub(price[0], price[1])
	case strings.Contains(formula, "*"):
		price = strings.Split(formula, "*")
		result = FloatMul(price[0], price[1], 2)
	case strings.Contains(formula, "/"):
		price = strings.Split(formula, "/")
		result = FloatQuo(price[0], price[1], 2)
	default:
		result = product_price_float
	}

	if result < 0 || result > product_price_float {
		result = product_price_float
	}
	return result, nil
}