feat 优惠活动可编辑

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/bytedance/sonic v1.11.6
 	github.com/cloudwego/hertz v0.9.1
 	github.com/corpix/uarand v0.2.0
+	github.com/expr-lang/expr v1.16.9
 	github.com/go-resty/resty/v2 v2.13.1
 	github.com/golang/glog v1.2.1
 	github.com/metacubex/mihomo v1.18.4

go.sum

@@ -81,6 +81,8 @@ github.com/ericlagergren/siv v0.0.0-20220507050439-0b757b3aa5f1 h1:tlDMEdcPRQKBE
 github.com/ericlagergren/siv v0.0.0-20220507050439-0b757b3aa5f1/go.mod h1:4RfsapbGx2j/vU5xC/5/9qB3kn9Awp1YDiEnN43QrJ4=
 github.com/ericlagergren/subtle v0.0.0-20220507045147-890d697da010 h1:fuGucgPk5dN6wzfnxl3D0D3rVLw4v2SbBT9jb4VnxzA=
 github.com/ericlagergren/subtle v0.0.0-20220507045147-890d697da010/go.mod h1:JtBcj7sBuTTRupn7c2bFspMDIObMJsVK8TeUvpShPok=
+github.com/expr-lang/expr v1.16.9 h1:WUAzmR0JNI9JCiF0/ewwHB1gmcGw5wW7nWt8gc6PpCI=
+github.com/expr-lang/expr v1.16.9/go.mod h1:8/vRC7+7HBzESEqt5kKpYXxrxkr31SaO8r40VO/1IT4=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/fsnotify/fsnotify v1.5.4/go.mod h1:OVB6XrOHzAwXMpEM7uPOzcehqUV2UqJxmVXmkdnm1bU=

model/product/model.go

@@ -2,6 +2,7 @@ package productv1
 
 import (
 	"fmt"
+	"github.com/expr-lang/expr"
 	"gorm.io/gorm"
 	"math"
 	"strings"
@@ -35,21 +36,20 @@ type Product struct {
 	DeletedAt gorm.DeletedAt `gorm:"index"`
 
 	Name      string `gorm:"index" json:"name"`
-	Pid       string `gorm:"unique;not null" json:"pid"`
+	Pid       string `gorm:"index:,unique,composite:product_pid_website_idx;not null" json:"pid"`
 	Color     string `json:"color"`
 	Link      string `json:"link"`
 	Image     string `json:"image"`
 	Orderable bool   `json:"orderable"`
 
-	USPrice      float64     `json:"usPrice"`
+	OriginalPrice float64     `json:"originalPrice"`
-	Website      Website     `json:"website" gorm:"index"`
+	Website       Website     `json:"website" gorm:"index:,unique,composite:product_pid_website_idx"`
 	DiscPercent   int         `json:"discPercent" gorm:"index"` //折扣力度
-	CNYPrice     float64     `json:"cnyPrice"`
+	CNYPrice      float64     `json:"cnyPrice"`                 // 最终的价格
 	CalMark       string      `json:"calMark"`                  //计算价格的过程
 	DWPrice       float64     `json:"dwPrice"`
 	Freight       float64     `json:"freight"`               //运费
 	ExchangeRate  float64     `json:"exchangeRate" gorm:"-"` //汇率
-	Discount     int         `json:"discount" gorm:"-"`     //折扣
 	Rate          float64     `json:"rate" gorm:"index"`     //利润率
 	PriceStatus   PriceStatus `json:"priceStatus"`           //价格状态
 	Remark        string      `json:"remark"`                //备注
@@ -62,29 +62,29 @@ func (p *Product) TableName() string {
 	return "products"
 }
 
+func (p *Product) Env() map[string]any {
+	return map[string]any{
+		"originalPrice": p.OriginalPrice,
+		"dwPrice":       p.DWPrice,
+		"freight":       p.Freight,
+		"exchangeRate":  p.ExchangeRate,
+	}
+}
+
 func (p *Product) BeforeSave(tx *gorm.DB) (err error) {
-	p.CalRate()
 	p.fillPriceStatus(tx)
+	p.CalRate()
 	return
 }
 
 func (p *Product) fillPriceStatus(tx *gorm.DB) {
-	switch p.Website {
-	case WebSite_US_Coach_Outlet:
-		p.fillUSCoachPriceStatus(tx)
-	case WebSite_CN_Coach:
-		p.fillCNCoachPriceStatus(tx)
-	}
-}
-
-func (p *Product) fillUSCoachPriceStatus(tx *gorm.DB) {
 	var lastPrice float64
-	tx.Model(&HistoryPrice{}).Where("pid = ?", p.Pid).Order("created_at desc").Limit(1).Pluck("us_price", &lastPrice)
+	tx.Model(&HistoryPrice{}).Where("pid = ?", p.Pid).Order("created_at desc").Limit(1).Pluck("original_price", &lastPrice)
-	if p.USPrice != lastPrice {
+	if p.OriginalPrice != lastPrice {
 		p.HistoryPrices = append(p.HistoryPrices, HistoryPrice{
-			USPrice: p.USPrice,
+			OriginalPrice: p.OriginalPrice,
 		})
-		if p.USPrice > lastPrice {
+		if p.OriginalPrice > lastPrice {
 			p.PriceStatus = PriceStatus_UP
 		} else {
 			p.PriceStatus = PriceStatus_DOWN
@@ -92,81 +92,83 @@ func (p *Product) fillUSCoachPriceStatus(tx *gorm.DB) {
 	}
 }
 
-func (p *Product) fillCNCoachPriceStatus(tx *gorm.DB) {
+func (p *Product) CalCNY(calculateProcess []CalculateProcess) {
-	var lastPrice float64
+	env := p.Env()
-	tx.Model(&HistoryPrice{}).Where("pid = ?", p.Pid).Order("created_at desc").Limit(1).Pluck("us_price", &lastPrice)
+	var calculateStrings = make([]string, 0, len(calculateProcess))
-	if p.CNYPrice != lastPrice {
+	for _, c := range calculateProcess {
-		p.HistoryPrices = append(p.HistoryPrices, HistoryPrice{
+		process, price := c.Calculate(env)
-			USPrice: p.CNYPrice,
+		if process != "" {
-		})
+			calculateStrings = append(calculateStrings, process)
-		if p.CNYPrice > lastPrice {
+			p.CNYPrice = min(p.CNYPrice, price)
-			p.PriceStatus = PriceStatus_UP
-		} else {
-			p.PriceStatus = PriceStatus_DOWN
 		}
 	}
+	p.CalMark = strings.Join(calculateStrings, "\n")
 }
 
+//func (p *Product) CalRate() {
+//	switch p.Website {
+//	case WebSite_US_Coach_Outlet:
+//		p.CalRateUSCoach()
+//	case WebSite_CN_Coach:
+//		p.CalRateCNCoach()
+//	}
+//}
+
+//func (p *Product) CalRateUSCoach() {
+//	calculationProcess := make([]string, 0, 2) //存放计算过程
+//	if p.ExchangeRate == 0 {
+//		p.ExchangeRate = defaultExchangeRate
+//	}
+//	if p.Freight == 0 {
+//		p.Freight = defaultFreight
+//	}
+//	if p.Discount == 0 {
+//		p.Discount = 100
+//	}
+//
+//	//先计算打九折的价格
+//	tmpPrice := p.USPrice * 0.9 // 这是打九折的价格
+//	p.CNYPrice = tmpPrice*p.ExchangeRate + p.Freight
+//	calculationProcess = append(calculationProcess, fmt.Sprintf("【九折】%.2f * 0.9 * %.2f + %.2f = %.2f", p.USPrice, p.ExchangeRate, p.Freight, p.CNYPrice))
+//	var discountPrice = p.USPrice
+//	if 0 < p.Discount && p.Discount < 100 {
+//		discountPrice = p.USPrice * float64(p.Discount) / 100
+//	}
+//	if discountPrice >= 150 {
+//		calculationProcess = append(calculationProcess, fmt.Sprintf("【150 -20】(%.2f * %d%% - 20) * %.2f + %.2f = %.2f", p.USPrice, p.Discount, p.ExchangeRate, p.Freight, (discountPrice-20)*p.ExchangeRate+p.Freight))
+//		if discountPrice-20 < tmpPrice {
+//			// 符合满150-20,而且比九折便宜
+//			tmpPrice = discountPrice - 20
+//			p.CNYPrice = tmpPrice*p.ExchangeRate + p.Freight
+//		}
+//	} else if discountPrice >= 100 {
+//		calculationProcess = append(calculationProcess, fmt.Sprintf("【100 -10】(%.2f * %d%%  - 10) * %.2f + %.2f = %.2f", p.USPrice, p.Discount, p.ExchangeRate, p.Freight, (discountPrice-10)*p.ExchangeRate+p.Freight))
+//		if discountPrice-10 < tmpPrice {
+//			// 符合满100 -10,而且比九折便宜
+//			tmpPrice = discountPrice - 10
+//			p.CNYPrice = tmpPrice*p.ExchangeRate + p.Freight
+//		}
+//	} else if p.Discount < 90 {
+//		calculationProcess = append(calculationProcess, fmt.Sprintf("【打折扣】%.2f * %d%% * %.2f + %.2f = %.2f", p.USPrice, p.Discount, p.ExchangeRate, p.Freight, p.USPrice*float64(p.Discount)/100*p.ExchangeRate+p.Freight))
+//		p.CNYPrice = p.USPrice*float64(p.Discount)/100*p.ExchangeRate + p.Freight
+//	}
+//	p.CalMark = strings.Join(calculationProcess, "\n")
+//	if p.DWPrice > 0 {
+//		// 如果有得物价格，就计算收益率
+//		p.Rate = Decimal((p.DWPrice - p.CNYPrice) / p.CNYPrice * 100)
+//	}
+//
+//	p.CNYPrice = Decimal(p.CNYPrice)
+//}
+
+// CalRate 计算收益率
 func (p *Product) CalRate() {
-	switch p.Website {
-	case WebSite_US_Coach_Outlet:
-		p.CalRateUSCoach()
-	case WebSite_CN_Coach:
-		p.CalRateCNCoach()
-	}
-}
-
-func (p *Product) CalRateUSCoach() {
-	calculationProcess := make([]string, 0, 2) //存放计算过程
-	if p.ExchangeRate == 0 {
-		p.ExchangeRate = defaultExchangeRate
-	}
-	if p.Freight == 0 {
-		p.Freight = defaultFreight
-	}
-	if p.Discount == 0 {
-		p.Discount = 100
-	}
-
-	//先计算打九折的价格
-	tmpPrice := p.USPrice * 0.9 // 这是打九折的价格
-	p.CNYPrice = tmpPrice*p.ExchangeRate + p.Freight
-	calculationProcess = append(calculationProcess, fmt.Sprintf("【九折】%.2f * 0.9 * %.2f + %.2f = %.2f", p.USPrice, p.ExchangeRate, p.Freight, p.CNYPrice))
-	var discountPrice = p.USPrice
-	if 0 < p.Discount && p.Discount < 100 {
-		discountPrice = p.USPrice * float64(p.Discount) / 100
-	}
-	if discountPrice >= 150 {
-		calculationProcess = append(calculationProcess, fmt.Sprintf("【150 -20】(%.2f * %d%% - 20) * %.2f + %.2f = %.2f", p.USPrice, p.Discount, p.ExchangeRate, p.Freight, (discountPrice-20)*p.ExchangeRate+p.Freight))
-		if discountPrice-20 < tmpPrice {
-			// 符合满150-20,而且比九折便宜
-			tmpPrice = discountPrice - 20
-			p.CNYPrice = tmpPrice*p.ExchangeRate + p.Freight
-		}
-	} else if discountPrice >= 100 {
-		calculationProcess = append(calculationProcess, fmt.Sprintf("【100 -10】(%.2f * %d%%  - 10) * %.2f + %.2f = %.2f", p.USPrice, p.Discount, p.ExchangeRate, p.Freight, (discountPrice-10)*p.ExchangeRate+p.Freight))
-		if discountPrice-10 < tmpPrice {
-			// 符合满100 -10,而且比九折便宜
-			tmpPrice = discountPrice - 10
-			p.CNYPrice = tmpPrice*p.ExchangeRate + p.Freight
-		}
-	} else if p.Discount < 90 {
-		calculationProcess = append(calculationProcess, fmt.Sprintf("【打折扣】%.2f * %d%% * %.2f + %.2f = %.2f", p.USPrice, p.Discount, p.ExchangeRate, p.Freight, p.USPrice*float64(p.Discount)/100*p.ExchangeRate+p.Freight))
-		p.CNYPrice = p.USPrice*float64(p.Discount)/100*p.ExchangeRate + p.Freight
-	}
-	p.CalMark = strings.Join(calculationProcess, "\n")
-	if p.DWPrice > 0 {
-		// 如果有得物价格，就计算收益率
-		p.Rate = Decimal((p.DWPrice - p.CNYPrice) / p.CNYPrice * 100)
-	}
-
-	p.CNYPrice = Decimal(p.CNYPrice)
-}
-
-func (p *Product) CalRateCNCoach() {
 	if p.DWPrice > 0 {
 		// 如果有得物价格，就计算收益率
 		p.Rate = Decimal((p.DWPrice - p.CNYPrice) / p.CNYPrice * 100)
+	} else if p.Rate > 0 {
+		// 如果得物价格为0, 收益率应该设置为0
+		p.Rate = 0
 	}
 
 	p.CNYPrice = Decimal(p.CNYPrice)
@@ -182,7 +184,7 @@ type HistoryPrice struct {
 	CreatedAt time.Time `json:"createdAt"`
 
 	Pid           string  `gorm:"index" json:"pid"`
-	USPrice float64 `json:"usPrice"`
+	OriginalPrice float64 `json:"originalPrice"`
 }
 
 type DWHistoryPrice struct {
@@ -192,3 +194,46 @@ type DWHistoryPrice struct {
 	Pid     string  `gorm:"index" json:"pid"`
 	DWPrice float64 `json:"dwPrice"`
 }
+
+// CalculateProcess 计算过程
+type CalculateProcess struct {
+	ID        uint           `gorm:"primary_key" json:"id"`
+	CreatedAt time.Time      `json:"createdAt"`
+	UpdatedAt time.Time      `json:"updatedAt"`
+	DeletedAt gorm.DeletedAt `gorm:"index"`
+
+	Pid       string
+	Website   Website
+	Condition string
+	Process   string
+	Name      string
+}
+
+func (c *CalculateProcess) Calculate(env map[string]any) (string, float64) {
+	if c.Condition != "" {
+		condition, err := expr.Compile(c.Condition, expr.AsBool())
+		if err != nil {
+			return fmt.Sprintf("【%s】 condition compile error: %v", c.Name, err), 0
+		}
+		if ok, err := expr.Run(condition, env); err != nil {
+			return fmt.Sprintf("【%s】 condition run error: %v", c.Name, err), 0
+		} else if !ok.(bool) {
+			return "", 0
+		}
+	}
+	program, err := expr.Compile(c.Process, expr.AsFloat64())
+	if err != nil {
+		return fmt.Sprintf("【%s】 process compile error: %v", c.Name, err), 0
+	}
+
+	output, err := expr.Run(program, env)
+	if err != nil {
+		return fmt.Sprintf("【%s】 process run error: %v", c.Name, err), 0
+	}
+	var replaceList = make([]string, 0, 2*len(env))
+	for k, v := range env {
+		replaceList = append(replaceList, k, fmt.Sprintf("%v", v))
+	}
+	replacer := strings.NewReplacer(replaceList...)
+	return replacer.Replace(fmt.Sprintf("【%s】 %s = %.2f", c.Name, c.Process, output.(float64))), output.(float64)
+}

model/product/model_test.go

@@ -32,7 +32,7 @@ func TestUpsert(t *testing.T) {
 			Link:          "www.baidu.com",
 			Image:         "image",
 			Orderable:     false,
-			USPrice:   123,
+			OriginalPrice: 123,
 			DWPrice:       3000,
 			Freight:       130,
 		},
@@ -50,7 +50,7 @@ func TestUpdate(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	var p = Product{Pid: "CJ575-QBO4G", DWPrice: 3000, Freight: 150, Remark: "test", USPrice: 209.3, ExchangeRate: 7.3}
+	var p = Product{Pid: "CJ575-QBO4G", DWPrice: 3000, Freight: 150, Remark: "test", OriginalPrice: 209.3, ExchangeRate: 7.3}
 	err = db.Model(&p).Where("pid = ?", p.Pid).Select("dw_price", "freight", "remark", "rate", "cal_mark", "cny_price").Updates(&p).Error
 	if err != nil {
 		t.Fatal(err)
@@ -72,3 +72,18 @@ func TestGetConfig(t *testing.T) {
 	db.Table("options").Select("exchange_rate").Where("id = ?", 1).Scan(&exchangeRate)
 	t.Log(exchangeRate)
 }
+
+func TestCalculateProcess_Calculate(t *testing.T) {
+	p := Product{
+		OriginalPrice: 160.9,
+		Freight:       100,
+		ExchangeRate:  7.3,
+		PriceStatus:   0,
+	}
+	cal := CalculateProcess{
+		Condition: "usPrice >= 150",
+		Process:   "(usPrice - 20) * exchangeRate + freight",
+		Name:      "满150 - 20",
+	}
+	t.Log(cal.Calculate(p.Env()))
+}