49 lines
1.5 KiB
Go
49 lines
1.5 KiB
Go
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package service
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import (
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"math"
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"github.com/Wei-Shaw/sub2api/internal/payment"
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"github.com/shopspring/decimal"
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)
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const defaultBalanceRechargeMultiplier = 1.0
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func normalizeBalanceRechargeMultiplier(multiplier float64) float64 {
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if math.IsNaN(multiplier) || math.IsInf(multiplier, 0) || multiplier <= 0 {
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return defaultBalanceRechargeMultiplier
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}
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return multiplier
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}
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// normalizeSubscriptionUSDToCNYRate 将非法值归一为 0（换算关闭）。
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// 与余额倍率不同，0 是合法状态：表示订阅保持 price 直付的存量行为。
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func normalizeSubscriptionUSDToCNYRate(rate float64) float64 {
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if math.IsNaN(rate) || math.IsInf(rate, 0) || rate < 0 {
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return 0
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}
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return rate
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}
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func calculateCreditedBalance(paymentAmount, multiplier float64) float64 {
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return decimal.NewFromFloat(paymentAmount).
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Mul(decimal.NewFromFloat(normalizeBalanceRechargeMultiplier(multiplier))).
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Round(2).
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InexactFloat64()
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}
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func calculateGatewayRefundAmount(orderAmount, payAmount, refundAmount float64, currency string) float64 {
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if orderAmount <= 0 || payAmount <= 0 || refundAmount <= 0 {
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return 0
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}
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fractionDigits := int32(payment.CurrencyMaxFractionDigits(currency))
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if math.Abs(refundAmount-orderAmount) <= paymentAmountToleranceForCurrency(currency) {
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return decimal.NewFromFloat(payAmount).Round(fractionDigits).InexactFloat64()
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}
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return decimal.NewFromFloat(payAmount).
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Mul(decimal.NewFromFloat(refundAmount)).
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Div(decimal.NewFromFloat(orderAmount)).
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Round(fractionDigits).
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InexactFloat64()
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}
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