功能增加

backend/internal/billing/minimax.go

@@ -0,0 +1,49 @@
+package billing
+
+import (
+	"errors"
+	"math"
+	"strings"
+)
+
+const MinimaxH3Model = "MiniMax-H3"
+
+type MinimaxH3ActualAmountInput struct {
+	Resolution        string
+	OutputSeconds     int64
+	InputVideoSeconds int64
+	InputImageCount   int64
+	MarkupMultiplier  float64
+}
+
+func MinimaxH3VideoPriceFenPerSecond(resolution string) int64 {
+	if strings.EqualFold(strings.TrimSpace(resolution), "2K") {
+		return 80
+	}
+	return 50
+}
+
+// CalculateMinimaxH3ActualAmountFen follows the official pay-as-you-go H3
+// formula. The first five input images are free; this first product release
+// accepts at most one, while keeping the calculator correct for future modes.
+func CalculateMinimaxH3ActualAmountFen(input MinimaxH3ActualAmountInput) (int64, error) {
+	if input.OutputSeconds <= 0 {
+		return 0, errors.New("MiniMax H3 output seconds must be positive")
+	}
+	if input.InputVideoSeconds < 0 || input.InputImageCount < 0 {
+		return 0, errors.New("MiniMax H3 input usage must not be negative")
+	}
+	if input.MarkupMultiplier < 1 {
+		return 0, errors.New("MiniMax H3 markup multiplier must be at least 1")
+	}
+	videoSeconds := input.OutputSeconds + input.InputVideoSeconds
+	standardAmountFen := videoSeconds * MinimaxH3VideoPriceFenPerSecond(input.Resolution)
+	if input.InputImageCount > 5 {
+		standardAmountFen += (input.InputImageCount - 5) * 20
+	}
+	return int64(math.Ceil(float64(standardAmountFen) * input.MarkupMultiplier)), nil
+}
+
+func IsMinimaxH3BillingModel(model string) bool {
+	return strings.EqualFold(strings.TrimSpace(model), MinimaxH3Model)
+}