package column

import "time"

// Column 专栏实体
type Column struct {
	ID          uint64     `xorm:"pk autoincr 'id'"`
	Title       string     `xorm:"varchar(100) notnull 'title'"`          // 专栏标题
	Brief       string     `xorm:"varchar(500) 'brief'"`                  // 专栏简介
	Cover       string     `xorm:"varchar(255) 'cover'"`                  // 封面图片
	AuthorID    uint64     `xorm:"notnull 'author_id'"`                   // 作者ID
	Status      int8       `xorm:"tinyint(1) notnull default 1 'status'"` // 状态：1-正常 2-下架
	ArticleNum  int        `xorm:"int default 0 'article_num'"`           // 文章数量
	FollowNum   int        `xorm:"int default 0 'follow_num'"`            // 关注人数
	PurchaseNum int        `xorm:"int default 0 'purchase_num'"`          // 购买人数
	CreatedAt   time.Time  `xorm:"created 'created_at'"`
	UpdatedAt   time.Time  `xorm:"updated 'updated_at'"`
	DeletedAt   *time.Time `xorm:"deleted 'deleted_at'"`
}

// NewColumn 创建专栏
func NewColumn(title string, brief string, cover string, authorID uint64) *Column {
	return &Column{
		Title:    title,
		Brief:    brief,
		Cover:    cover,
		AuthorID: authorID,
		Status:   1,
	}
}

// IsValid 检查专栏是否有效
func (c *Column) IsValid() bool {
	return c.Status == 1 && c.DeletedAt == nil
}

// AddArticle 增加文章数量
func (c *Column) AddArticle() {
	c.ArticleNum++
}

// RemoveArticle 减少文章数量
func (c *Column) RemoveArticle() {
	if c.ArticleNum > 0 {
		c.ArticleNum--
	}
}

// AddFollow 增加关注人数
func (c *Column) AddFollow() {
	c.FollowNum++
}

// RemoveFollow 减少关注人数
func (c *Column) RemoveFollow() {
	if c.FollowNum > 0 {
		c.FollowNum--
	}
}

// AddPurchase 增加购买人数
func (c *Column) AddPurchase() {
	c.PurchaseNum++
}

// RemovePurchase 减少购买人数
func (c *Column) RemovePurchase() {
	if c.PurchaseNum > 0 {
		c.PurchaseNum--
	}
}