package payment

import (
	"context"
	"time"

	"github.com/bytedance/sonic"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"

	agentrecharge "github.com/break/junhong_cmp_fiber/internal/application/agentrecharge"
	walletapp "github.com/break/junhong_cmp_fiber/internal/application/wallet"
	"github.com/break/junhong_cmp_fiber/internal/infrastructure/messaging/outbox"
	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
)

// AgentRechargePaymentConsumer 将已确认收款的代理在线充值幂等入账主钱包。
type AgentRechargePaymentConsumer struct {
	db      *gorm.DB
	posting *walletapp.PostingService
}

// NewAgentRechargePaymentConsumer 创建代理在线充值入账消费者。
func NewAgentRechargePaymentConsumer(db *gorm.DB, posting *walletapp.PostingService) *AgentRechargePaymentConsumer {
	return &AgentRechargePaymentConsumer{db: db, posting: posting}
}

// Consume 校验支付与充值权威事实后，在独立事务中完成唯一入账和充值终态。
func (c *AgentRechargePaymentConsumer) Consume(ctx context.Context, envelope outbox.DeliveryEnvelope) error {
	if c == nil || c.db == nil || c.posting == nil {
		return errors.New(errors.CodeInternalError, "代理在线充值入账消费者未配置")
	}
	if envelope.EventType != constants.OutboxEventTypeAgentRechargePaymentConfirmed ||
		envelope.PayloadVersion != constants.AgentRechargePaymentConfirmedPayloadVersionV1 {
		return errors.New(errors.CodeInvalidParam, "代理充值支付确认事件类型或版本不受支持")
	}
	var event agentrecharge.PaymentConfirmedEvent
	if err := sonic.Unmarshal(envelope.Payload, &event); err != nil {
		return errors.Wrap(errors.CodeInvalidParam, err, "代理充值支付确认事件载荷无法解析")
	}
	if event.EventID == "" || event.EventID != envelope.EventID || event.RechargeID == 0 || event.PaymentID == 0 ||
		event.ShopID == 0 || event.WalletID == 0 || event.Amount <= 0 || event.ThirdPartyTradeNo == "" {
		return errors.New(errors.CodeInvalidParam, "代理充值支付确认事件载荷不完整")
	}
	return c.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		recharge, _, err := lockCreditingFacts(ctx, tx, event)
		if err != nil {
			return err
		}
		if recharge.Status != constants.RechargeStatusPaid && recharge.Status != constants.RechargeStatusCompleted {
			return errors.New(errors.CodeInvalidStatus, "代理在线充值当前状态不可入账")
		}
		if _, err := c.posting.PostInTx(ctx, tx, walletapp.PostingCommand{
			ShopID: recharge.ShopID, WalletID: recharge.AgentWalletID, Amount: recharge.Amount,
			ReferenceType: constants.ReferenceTypeTopup, ReferenceID: recharge.ID,
			TransactionType: constants.AgentTransactionTypeRecharge,
			UserID:          recharge.UserID, Creator: recharge.UserID, Remark: "代理在线扫码充值",
			RequestID: envelope.RequestID, CorrelationID: envelope.CorrelationID,
		}); err != nil {
			return err
		}
		if recharge.Status == constants.RechargeStatusCompleted {
			return nil
		}
		completedAt := time.Now().UTC()
		update := tx.WithContext(ctx).Model(&model.AgentRechargeRecord{}).
			Where("id = ? AND status = ?", recharge.ID, constants.RechargeStatusPaid).
			Updates(map[string]any{"status": constants.RechargeStatusCompleted, "completed_at": completedAt})
		if update.Error != nil {
			return errors.Wrap(errors.CodeDatabaseError, update.Error, "完成代理在线充值单失败")
		}
		if update.RowsAffected != 1 {
			return errors.New(errors.CodeConflict, "代理在线充值状态已变化")
		}
		return nil
	})
}

func lockCreditingFacts(ctx context.Context, tx *gorm.DB, event agentrecharge.PaymentConfirmedEvent) (*model.AgentRechargeRecord, *model.Payment, error) {
	var recharge model.AgentRechargeRecord
	if err := tx.WithContext(ctx).Clauses(clause.Locking{Strength: "UPDATE"}).Where("id = ?", event.RechargeID).First(&recharge).Error; err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, nil, errors.New(errors.CodeNotFound, "代理在线充值单不存在")
		}
		return nil, nil, errors.Wrap(errors.CodeDatabaseError, err, "锁定代理在线充值单失败")
	}
	var payment model.Payment
	if err := tx.WithContext(ctx).Where("id = ?", event.PaymentID).First(&payment).Error; err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, nil, errors.New(errors.CodeConflict, "代理在线充值支付单不存在")
		}
		return nil, nil, errors.Wrap(errors.CodeDatabaseError, err, "查询代理在线充值支付单失败")
	}
	if recharge.ID != event.RechargeID || recharge.RechargeNo != event.RechargeNo || recharge.ShopID != event.ShopID ||
		recharge.AgentWalletID != event.WalletID || recharge.UserID != event.UserID || recharge.Amount != event.Amount ||
		recharge.PaymentTransactionID == nil || *recharge.PaymentTransactionID != event.ThirdPartyTradeNo ||
		(recharge.PaymentMethod != constants.RechargeMethodWechat && recharge.PaymentMethod != constants.RechargeMethodAlipay) {
		return nil, nil, errors.New(errors.CodeConflict, "代理充值事件与充值权威事实不一致")
	}
	if payment.OrderType != model.PaymentOrderTypeAgentRecharge || payment.OrderID != recharge.ID ||
		payment.PaymentNo != event.PaymentNo || payment.PaymentMethod != event.PaymentMethod || payment.Amount != event.Amount ||
		payment.Status != model.PaymentRecordStatusPaid || payment.ThirdPartyTradeNo != event.ThirdPartyTradeNo {
		return nil, nil, errors.New(errors.CodeConflict, "代理充值事件与支付权威事实不一致")
	}
	return &recharge, &payment, nil
}

var _ outbox.EventConsumer = (*AgentRechargePaymentConsumer)(nil)