Files
tyapi-server/internal/domains/finance/entities/wallet.go
2025-07-28 01:46:39 +08:00

108 lines
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Go
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package entities
import (
"fmt"
"time"
"github.com/google/uuid"
"github.com/shopspring/decimal"
"gorm.io/gorm"
)
// Wallet 钱包聚合根
// 用户数字钱包的核心信息,支持多种钱包类型和精确的余额管理
// 使用decimal类型确保金额计算的精确性避免浮点数精度问题
// 支持欠费(余额<0但只允许扣到小于0一次之后不能再扣
// 新建钱包时可配置默认额度
type Wallet struct {
// 基础标识
ID string `gorm:"primaryKey;type:varchar(36)" json:"id" comment:"钱包唯一标识"`
UserID string `gorm:"type:varchar(36);not null;uniqueIndex" json:"user_id" comment:"关联用户ID"`
// 钱包状态 - 钱包的基本状态信息
IsActive bool `gorm:"default:true" json:"is_active" comment:"钱包是否激活"`
Balance decimal.Decimal `gorm:"type:decimal(20,8);default:0" json:"balance" comment:"钱包余额(精确到8位小数)"`
Version int64 `gorm:"version" json:"version" comment:"乐观锁版本号"`
// 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 (Wallet) TableName() string {
return "wallets"
}
// IsZeroBalance 检查余额是否为零
func (w *Wallet) IsZeroBalance() bool {
return w.Balance.IsZero()
}
// HasSufficientBalance 检查是否有足够余额(允许透支额度)
func (w *Wallet) HasSufficientBalance(amount decimal.Decimal) bool {
// 允许扣到额度下限
return w.Balance.Sub(amount).GreaterThanOrEqual(decimal.Zero)
}
// IsArrears 是否欠费(余额<0
func (w *Wallet) IsArrears() bool {
return w.Balance.LessThan(decimal.Zero)
}
// IsLowBalance 是否余额较低(余额<300
func (w *Wallet) IsLowBalance() bool {
return w.Balance.LessThan(decimal.NewFromInt(300))
}
// GetBalanceStatus 获取余额状态
func (w *Wallet) GetBalanceStatus() string {
if w.IsArrears() {
return "arrears" // 欠费
} else if w.IsLowBalance() {
return "low" // 余额较低
} else {
return "normal" // 正常
}
}
// AddBalance 增加余额(只做加法,业务规则由服务层控制是否允许充值)
func (w *Wallet) AddBalance(amount decimal.Decimal) {
w.Balance = w.Balance.Add(amount)
}
// SubtractBalance 扣减余额,含欠费业务规则
func (w *Wallet) SubtractBalance(amount decimal.Decimal) error {
if w.Balance.LessThan(decimal.Zero) {
return fmt.Errorf("已欠费,不能再扣款")
}
newBalance := w.Balance.Sub(amount)
w.Balance = newBalance
return nil
}
// GetFormattedBalance 获取格式化的余额字符串
func (w *Wallet) GetFormattedBalance() string {
return w.Balance.String()
}
// BeforeCreate GORM钩子创建前自动生成UUID
func (w *Wallet) BeforeCreate(tx *gorm.DB) error {
if w.ID == "" {
w.ID = uuid.New().String()
}
return nil
}
// NewWallet 工厂方法
func NewWallet(userID string, defaultCreditLimit decimal.Decimal) *Wallet {
return &Wallet{
UserID: userID,
IsActive: true,
Balance: defaultCreditLimit,
Version: 0,
}
}