update 计算利润率的函数放到这里

structs/utils/profit-rate.go

@@ -0,0 +1,52 @@
+package utils
+
+import (
+	"fmt"
+	"strconv"
+
+	v2 "gitea.timerzz.com/kedaya_haitao/common/structs/v2"
+)
+
+func ProfitRate(article *v2.Article) (after *v2.Article, changed bool) {
+	// 拿到最低成本价和最低售价
+	var cost, sell float64
+	//检查能不能购买，只要有一个供应商能买，就认为能购买
+	var available bool
+
+	for _, provider := range article.Providers {
+		final := provider.Cost.FinalPrice
+		if final > 0 && (final < cost || cost == 0) && !provider.Exclude {
+			if available && !provider.Available {
+				// 上个最低价供应商能买，这个供应商不能买，那么即使现在的供应商价格更低，也不使用
+				continue
+			}
+			cost = final
+		}
+		available = available || provider.Available
+	}
+
+	for _, seller := range article.Sellers {
+		final := seller.Sell.FinalPrice
+		if final > 0 && (final < sell || sell == 0) && !seller.Exclude {
+			sell = final
+		}
+	}
+	// 成本和售价没有改动，不保存，直接返回
+	if cost == article.CostPrice && sell == article.SellPrice {
+		return article, false
+	}
+	// 到这里说明成本和售价有变动
+	article.CostPrice = Decimal(cost)
+	article.SellPrice = Decimal(sell)
+	article.Available = available
+	if cost > 0 {
+		article.Rate = Decimal((article.SellPrice - article.CostPrice) * 100 / article.CostPrice)
+	}
+	article.GrossProfit = Decimal(article.SellPrice - article.CostPrice)
+	return article, true
+}
+
+func Decimal(num float64) float64 {
+	num, _ = strconv.ParseFloat(fmt.Sprintf("%.2f", num), 64)
+	return num
+}