package listing

// CoinWan 将内部哈夫币数量转为万。
func CoinWan(hafCoinAmount int64) float64 {
	return float64(hafCoinAmount) / 10000
}

// BaseExchangeRatio 是主站挂牌的「1 元兑换哈夫币」比例。
func BaseExchangeRatio(hafCoinAmount, priceCent int64) float64 {
	if hafCoinAmount <= 0 || priceCent <= 0 {
		return 0
	}
	return roundRatio(CoinWan(hafCoinAmount) / centToYuan(priceCent))
}

// ApplyShelfRatio 按分站加价比例重算售价。delta=0 时保持原价，避免四舍五入漂移。
func ApplyShelfRatio(hafCoinAmount, basePriceCent int64, ratioDelta float64) (priceCent int64, baseRatio, siteRatio float64) {
	baseRatio = BaseExchangeRatio(hafCoinAmount, basePriceCent)
	if ratioDelta < 0 {
		ratioDelta = 0
	}
	if baseRatio <= 0 || ratioDelta == 0 {
		return basePriceCent, baseRatio, baseRatio
	}
	siteRatio = roundRatio(baseRatio + ratioDelta)
	if siteRatio <= 0 {
		return basePriceCent, baseRatio, baseRatio
	}
	priceCent = yuanToCent(CoinWan(hafCoinAmount) / siteRatio)
	if priceCent < 0 {
		priceCent = 0
	}
	return priceCent, baseRatio, siteRatio
}