60a4b9316b
- Add balance_recharge_multiplier system setting (e.g. 1.2 = charge 100 get 120) - Separate order_amount (credited balance) from pay_amount (actual payment) - Refund calculates gateway amount proportionally from pay_amount - Frontend shows both amounts in order details, payment status, refund dialog - Admin settings UI for configuring recharge multiplier
38 lines
1020 B
Go
38 lines
1020 B
Go
package service
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import (
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"math"
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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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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) 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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if math.Abs(refundAmount-orderAmount) <= amountToleranceCNY {
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return decimal.NewFromFloat(payAmount).Round(2).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(2).
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InexactFloat64()
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}
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