cls/internal/domain/purchase/entity.go

package purchase

import "time"

// ContentType 内容类型
type ContentType int8

const (
	ContentTypeArticle ContentType = 1 // 文章
	ContentTypeColumn  ContentType = 2 // 专栏
)

// ContentSource 内容来源
type ContentSource int8

const (
	ContentSourceBuy  ContentSource = 1 // 购买
	ContentSourceGift ContentSource = 2 // 赠送
)

// Purchase 内容购买记录
type Purchase struct {
	Id            uint64        `xorm:"pk autoincr 'id'" json:"id"`
	UserId        uint64        `xorm:"notnull 'user_id'" json:"userId"`
	ContentId     uint64        `xorm:"notnull 'content_id'" json:"contentId"`
	ContentType   ContentType   `xorm:"tinyint(1) notnull 'content_type'" `
	Price         float64       `xorm:"decimal(10,2) notnull 'price'" json:"price"`
	Duration      int           `xorm:"notnull 'duration'" json:"duration"`    // 购买时长（月），文章为0表示永久
	ExpiredAt     time.Time     `xorm:"notnull 'expired_at'" json:"expiredAt"` // 过期时间，文章为null表示永久
	ContentSource ContentSource `xorm:"tinyint(1) notnull 'content_source'" `
	Status        int8          `xorm:"tinyint(1) default 1 'status'" json:"status"`
	CreatedAt     time.Time     `xorm:"datetime created 'created_at'" json:"createdAt"`
	UpdatedAt     time.Time     `xorm:"datetime updated 'updated_at'" json:"updatedAt"`
}

// IsValid 检查购买记录是否有效
func (p *Purchase) IsValid() bool {
	if p.Status != 1 {
		return false
	}
	if p.ContentType == ContentTypeArticle {
		return true // 文章永久有效
	}
	return time.Now().Before(p.ExpiredAt)
}

// NewPurchase 创建购买记录
func NewPurchase(userId, contentId uint64, contentType ContentType, price float64, duration int) *Purchase {
	purchase := &Purchase{
		UserId:      userId,
		ContentId:   contentId,
		ContentType: contentType,
		Price:       price,
		Duration:    duration,
		Status:      1,
	}

	// 设置过期时间
	if contentType == ContentTypeColumn {
		purchase.ExpiredAt = time.Now().AddDate(0, duration, 0)
	}

	return purchase
}