package wallet

import (
	"context"

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

	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"
)

// CreditEventConsumer 校验已投递的代理主钱包入账事件具有对应权威资金流水。
type CreditEventConsumer struct {
	db *gorm.DB
}

// NewCreditEventConsumer 创建代理主钱包入账事件消费者。
func NewCreditEventConsumer(db *gorm.DB) *CreditEventConsumer {
	return &CreditEventConsumer{db: db}
}

// Consume 校验事件载荷及不可变流水，拒绝确认未知或损坏事件。
func (c *CreditEventConsumer) Consume(ctx context.Context, envelope outbox.DeliveryEnvelope) error {
	if c == nil || c.db == nil {
		return errors.New(errors.CodeInternalError, "代理主钱包入账事件消费者未配置")
	}
	if envelope.EventType != constants.OutboxEventTypeAgentMainWalletCredited || envelope.PayloadVersion != constants.AgentMainWalletCreditedPayloadVersionV1 {
		return errors.New(errors.CodeInvalidParam, "代理主钱包入账事件类型或版本不受支持")
	}
	var event walletapp.CreditedEvent
	if err := sonic.Unmarshal(envelope.Payload, &event); err != nil {
		return errors.Wrap(errors.CodeInvalidParam, err, "代理主钱包入账事件载荷无法解析")
	}
	validRecharge := event.ReferenceType == constants.ReferenceTypeTopup && event.TransactionType == constants.AgentTransactionTypeRecharge
	validAdjustment := event.ReferenceType == constants.ReferenceTypeManualAdjustment && event.TransactionType == constants.AgentTransactionTypeAdjustment
	if event.EventID != envelope.EventID || event.WalletID == 0 || event.ReferenceID == 0 || event.Amount <= 0 || (!validRecharge && !validAdjustment) {
		return errors.New(errors.CodeInvalidParam, "代理主钱包入账事件载荷不完整")
	}

	var transaction model.AgentWalletTransaction
	err := c.db.WithContext(ctx).Unscoped().
		Where("agent_wallet_id = ? AND reference_type = ? AND reference_id = ? AND transaction_type = ? AND status = ?",
			event.WalletID, event.ReferenceType, event.ReferenceID, event.TransactionType, constants.TransactionStatusSuccess).
		First(&transaction).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return errors.New(errors.CodeInternalError, "代理主钱包入账事件缺少权威资金流水")
		}
		return errors.Wrap(errors.CodeDatabaseError, err, "查询代理主钱包入账流水失败")
	}
	if transaction.Amount != event.Amount || transaction.BalanceBefore != event.BalanceBefore || transaction.BalanceAfter != event.BalanceAfter {
		return errors.New(errors.CodeInternalError, "代理主钱包入账事件与权威资金流水不一致")
	}
	return nil
}