package entities

import (
	"time"

	"github.com/google/uuid"
	"github.com/shopspring/decimal"
	"gorm.io/gorm"
)

// WalletTransaction 钱包扣款记录
// 记录API调用产生的扣款操作
type WalletTransaction struct {
	// 基础标识
	ID            string `gorm:"primaryKey;type:varchar(36)" json:"id" comment:"交易记录唯一标识"`
	UserID        string `gorm:"type:varchar(36);not null;index" json:"user_id" comment:"扣款用户ID"`
	ApiCallID     string `gorm:"type:varchar(64);not null;uniqueIndex" json:"api_call_id" comment:"关联API调用ID"`
	TransactionID string `gorm:"type:varchar(64);not null;uniqueIndex" json:"transaction_id" comment:"交易ID"`
	ProductID     string `gorm:"type:varchar(64);not null;index" json:"product_id" comment:"产品ID"`

	// 扣款信息
	Amount decimal.Decimal `gorm:"type:decimal(20,8);not null" json:"amount" comment:"扣款金额"`

	// 时间戳字段
	CreatedAt time.Time      `gorm:"autoCreateTime" json:"created_at" comment:"创建时间"`
	UpdatedAt time.Time      `gorm:"autoUpdateTime" json:"updated_at" comment:"更新时间"`
	DeletedAt gorm.DeletedAt `gorm:"index" json:"-" comment:"软删除时间"`
}

// TableName 指定数据库表名
func (WalletTransaction) TableName() string {
	return "wallet_transactions"
}

// BeforeCreate GORM钩子：创建前自动生成UUID
func (t *WalletTransaction) BeforeCreate(tx *gorm.DB) error {
	if t.ID == "" {
		t.ID = uuid.New().String()
	}
	return nil
}

// NewWalletTransaction 工厂方法 - 创建扣款记录
func NewWalletTransaction(userID, apiCallID, transactionID, productID string, amount decimal.Decimal) *WalletTransaction {
	return &WalletTransaction{
		UserID:        userID,
		ApiCallID:     apiCallID,
		TransactionID: transactionID,
		ProductID:     productID,
		Amount:        amount,
	}
}