package agentrecharge

import (
	"strings"

	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
)

// PaymentState 是支付单在确认用例中的领域状态。
type PaymentState int

const (
	// PaymentStatePending 表示支付单仍待确认。
	PaymentStatePending PaymentState = iota
	// PaymentStatePaid 表示支付单已确认收款。
	PaymentStatePaid
	// PaymentStateFailed 表示支付单曾被明确关闭。
	PaymentStateFailed
	// PaymentStateRefunded 表示支付单已经退款。
	PaymentStateRefunded
)

// PaymentConfirmationFacts 是支付确认所需的渠道与本地权威事实。
type PaymentConfirmationFacts struct {
	OrderType                 string
	ExpectedOrderType         string
	PaymentMethod             string
	RechargePaymentMethod     string
	RechargePaymentChannel    string
	PaymentConfigID           uint
	RechargePaymentConfigID   uint
	ConfirmedConfigID         uint
	MerchantIdentity          string
	ConfirmedMerchantIdentity string
	PaymentAmount             int64
	RechargeAmount            int64
	ConfirmedAmount           int64
	PaymentOrderID            uint
	RechargeID                uint
	PaymentState              PaymentState
	RechargeStatus            int
	StoredTradeNo             string
	ConfirmedTradeNo          string
}

// ValidatePaymentConfirmation 校验支付确认不变量，并返回是否属于完全一致的重复确认。
func ValidatePaymentConfirmation(facts PaymentConfirmationFacts) (bool, error) {
	if facts.ExpectedOrderType == "" || facts.OrderType != facts.ExpectedOrderType ||
		facts.RechargeID == 0 || facts.PaymentOrderID != facts.RechargeID {
		return false, errors.New(errors.CodeConflict, "支付单与代理充值单关联不一致")
	}
	method := strings.TrimSpace(facts.PaymentMethod)
	if method == "" || method != strings.TrimSpace(facts.RechargePaymentMethod) ||
		method != strings.TrimSpace(facts.RechargePaymentChannel) {
		return false, errors.New(errors.CodeConflict, "支付渠道与代理充值单不一致")
	}
	identity := strings.TrimSpace(facts.MerchantIdentity)
	if facts.PaymentConfigID == 0 || facts.PaymentConfigID != facts.RechargePaymentConfigID ||
		facts.PaymentConfigID != facts.ConfirmedConfigID || identity == "" ||
		identity != strings.TrimSpace(facts.ConfirmedMerchantIdentity) {
		return false, errors.New(errors.CodeConflict, "支付配置身份与创建记录不一致")
	}
	tradeNo := strings.TrimSpace(facts.ConfirmedTradeNo)
	if tradeNo == "" || facts.ConfirmedAmount <= 0 || facts.PaymentAmount != facts.RechargeAmount ||
		facts.PaymentAmount != facts.ConfirmedAmount {
		return false, errors.New(errors.CodeConflict, "支付金额或第三方交易号无效")
	}
	if facts.PaymentState == PaymentStatePaid {
		if strings.TrimSpace(facts.StoredTradeNo) == tradeNo &&
			(facts.RechargeStatus == constants.RechargeStatusPaid || facts.RechargeStatus == constants.RechargeStatusCompleted) {
			return true, nil
		}
		return false, errors.New(errors.CodeConflict, "支付单已存在不一致的确认事实")
	}
	validPending := facts.PaymentState == PaymentStatePending && facts.RechargeStatus == constants.RechargeStatusPending
	validLateSuccess := facts.PaymentState == PaymentStateFailed && facts.RechargeStatus == constants.RechargeStatusClosed
	if !validPending && !validLateSuccess {
		return false, errors.New(errors.CodeInvalidStatus, "代理充值单当前状态不可确认支付")
	}
	return false, nil
}