package billing

import (
	"errors"
	"math"
)

const BailianWan30VideoModel = "wan3.0-video"

// CalculateBailianWan30ActualAmountFen bills successful output duration. This
// integration accepts image inputs only, so there are no input video seconds.
func CalculateBailianWan30ActualAmountFen(outputSeconds float64, standardUnitPriceFen int64, markupMultiplier float64) (int64, error) {
	if math.IsNaN(outputSeconds) || math.IsInf(outputSeconds, 0) || outputSeconds <= 0 {
		return 0, errors.New("Wan 3.0 output seconds must be positive")
	}
	if standardUnitPriceFen <= 0 || math.IsNaN(markupMultiplier) || math.IsInf(markupMultiplier, 0) || markupMultiplier < 1 {
		return 0, errors.New("Wan 3.0 price or markup is invalid")
	}
	return int64(math.Ceil(outputSeconds * float64(standardUnitPriceFen) * markupMultiplier)), nil
}