package mysql

import "hyapp/pkg/xerr"

// giftPointPolicyAmounts 把一次付费礼物拆成主播 POINT 与 Agency POINT 两个独立账务分量。
// AgencyShareBaseAmount 一并固化到审计流水，避免策略发布后只能看到 20% 却无法证明当时的计算基数。
type giftPointPolicyAmounts struct {
	HostPointAdded        int64
	AgencyPointAdded      int64
	AgencyShareBaseAmount int64
}

// calculateGiftPointPolicyAmounts 只处理金额公式，不决定 Agency 资格；owner 快照仍由 gateway 在
// 送礼受理时从 user-service 获取，并由调用方在 owner_id>0 时才真正写 Agency 账。
func calculateGiftPointPolicyAmounts(chargeAmount int64, giftTypeRatio giftDiamondRatioSnapshot, policy walletPolicyInstance) (giftPointPolicyAmounts, error) {
	if chargeAmount < 0 || giftTypeRatio.PPM < 0 || giftTypeRatio.PPM > 1_000_000 {
		return giftPointPolicyAmounts{}, xerr.New(xerr.InvalidArgument, "gift point policy amount is invalid")
	}

	hostBaseAmount := chargeAmount
	if policy.HostGiftTypeRatioEnabled {
		// Fami 的普通/幸运/超级幸运礼物先沿用主播原有 100%/10%/1% 钻石口径；区域覆盖也在
		// 调用本函数前由 wallet owner 解析。这里保留两阶段向下取整，严格对应“主播实收后的 20%”。
		var err error
		hostBaseAmount, err = giftDiamondAmount(chargeAmount, giftTypeRatio.PPM)
		if err != nil {
			return giftPointPolicyAmounts{}, err
		}
	}
	hostPointAdded, err := giftDiamondAmount(hostBaseAmount, policy.HostPointRatioPPM)
	if err != nil {
		return giftPointPolicyAmounts{}, err
	}

	agencyShareBaseAmount := chargeAmount
	switch policy.AgencyPointShareBase {
	case agencyPointShareBaseChargeAmount:
		// 旧政策直接从礼物实扣金额切分 Agency POINT，保持已发布 Huwaa/Fami 历史实例兼容。
	case agencyPointShareBaseHostIncome:
		agencyShareBaseAmount = hostPointAdded
	default:
		return giftPointPolicyAmounts{}, xerr.New(xerr.InvalidArgument, "wallet policy agency share base is invalid")
	}
	agencyPointAdded, err := giftDiamondAmount(agencyShareBaseAmount, policy.AgencyPointRatioPPM)
	if err != nil {
		return giftPointPolicyAmounts{}, err
	}
	return giftPointPolicyAmounts{
		HostPointAdded:        hostPointAdded,
		AgencyPointAdded:      agencyPointAdded,
		AgencyShareBaseAmount: agencyShareBaseAmount,
	}, nil
}