106 lines
3.4 KiB
Go
106 lines
3.4 KiB
Go
package database
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import (
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"fmt"
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"gorm.io/gorm"
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"math"
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"strings"
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"time"
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)
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const (
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defaultExchangeRate float64 = 7.3
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defaultFreight float64 = 100
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)
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type Product struct {
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ID uint `gorm:"primary_key" json:"id"`
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CreatedAt time.Time `json:"createdAt"`
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UpdatedAt time.Time `json:"updatedAt"`
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DeletedAt gorm.DeletedAt `gorm:"index"`
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Name string `gorm:"index" json:"name"`
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Pid string `gorm:"unique;not null" json:"pid"`
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Color string `json:"color"`
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Link string `json:"link"`
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Image string `json:"image"`
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Orderable bool `json:"orderable"`
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USPrice float64 `json:"usPrice"`
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CNYPrice float64 `json:"cnyPrice"`
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CalMark string `json:"calMark"` //计算价格的过程
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DWPrice float64 `json:"dwPrice"`
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Freight float64 `json:"freight"` //运费
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ExchangeRate float64 `json:"exchangeRate" gorm:"-"` //汇率
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Rate float64 `json:"rate"` //利润率
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Remark string `json:"remark"` //备注
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HistoryPrices []HistoryPrice `gorm:"foreignKey:Pid;references:Pid" json:"historyPrices"`
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}
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func (p *Product) TableName() string {
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return "products"
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}
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func (p *Product) BeforeSave(tx *gorm.DB) (err error) {
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tx.Model(&Product{}).Where("pid = ?", p.Pid).Pluck("freight", &p.Freight)
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p.CalRate()
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var lastPrice float64
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tx.Model(&HistoryPrice{}).Where("pid = ?", p.Pid).Order("created_at desc").Limit(1).Pluck("us_price", &lastPrice)
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if p.USPrice != lastPrice {
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p.HistoryPrices = append(p.HistoryPrices, HistoryPrice{
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USPrice: p.USPrice,
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})
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}
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return
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}
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func (p *Product) CalRate() {
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calculationProcess := make([]string, 0, 2) //存放计算过程
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if p.ExchangeRate == 0 {
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p.ExchangeRate = defaultExchangeRate
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}
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if p.Freight == 0 {
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p.Freight = defaultFreight
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}
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//先计算打九折的价格
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tmpPrice := p.USPrice * 0.9 // 这是打九折的价格
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p.CNYPrice = tmpPrice*p.ExchangeRate + p.Freight
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calculationProcess = append(calculationProcess, fmt.Sprintf("【九折】%.2f * 0.9 * %.2f + %.2f = %.2f", p.USPrice, p.ExchangeRate, p.Freight, p.CNYPrice))
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if p.USPrice >= 150 {
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calculationProcess = append(calculationProcess, fmt.Sprintf("【150 -20 】(%.2f - 20) * %.2f + %.2f = %.2f", p.USPrice, p.ExchangeRate, p.Freight, (p.USPrice-20)*p.ExchangeRate+p.Freight))
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if p.USPrice-20 < tmpPrice {
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// 符合满150-20,而且比九折便宜
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tmpPrice = p.USPrice - 20
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p.CNYPrice = tmpPrice*p.ExchangeRate + p.Freight
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}
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} else if p.USPrice >= 100 {
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calculationProcess = append(calculationProcess, fmt.Sprintf("【100 -10 】(%.2f - 10) * %.2f + %.2f = %.2f", p.USPrice, p.ExchangeRate, p.Freight, (p.USPrice-10)*p.ExchangeRate+p.Freight))
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if p.USPrice-10 < tmpPrice {
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// 符合满100 -10,而且比九折便宜
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tmpPrice = p.USPrice - 10
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p.CNYPrice = tmpPrice*p.ExchangeRate + p.Freight
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}
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}
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p.CalMark = strings.Join(calculationProcess, "\n")
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if p.DWPrice > 0 {
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// 如果有得物价格，就计算收益率
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p.Rate = Decimal((p.DWPrice - p.CNYPrice) / p.CNYPrice * 100)
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}
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p.CNYPrice = Decimal(p.CNYPrice)
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}
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// Decimal 保留两位小数
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func Decimal(value float64) float64 {
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return math.Trunc(value*1e2+0.5) * 1e-2
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}
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type HistoryPrice struct {
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ID uint `gorm:"primary_key" json:"id"`
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CreatedAt time.Time `json:"createdAt"`
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Pid string `gorm:"index" json:"pid"`
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USPrice float64 `json:"usPrice"`
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}
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