package models

import (
	"time"

	"gorm.io/gorm"
)

// Tag 标签模型
type Tag struct {
	ID        uint   `json:"id" gorm:"primaryKey;column:id"`
	Name      string `json:"name" gorm:"column:name"`
	Slug      string `json:"slug" gorm:"column:slug;uniqueIndex"`
	CreatedAt int64  `json:"createdAt" gorm:"column:created_at"`
	UpdatedAt int64  `json:"updatedAt" gorm:"column:updated_at"`
	DeletedAt int64  `json:"deletedAt" gorm:"column:deleted_at;default:0"`
}

// TableName 指定表名
func (Tag) TableName() string {
	return "tags"
}

// BeforeCreate 创建前钩子
func (t *Tag) BeforeCreate(tx *gorm.DB) error {
	now := time.Now().Unix()
	if t.CreatedAt == 0 {
		t.CreatedAt = now
	}
	if t.UpdatedAt == 0 {
		t.UpdatedAt = now
	}
	if t.DeletedAt == 0 {
		t.DeletedAt = 0
	}
	return nil
}

// BeforeUpdate 更新前钩子
func (t *Tag) BeforeUpdate(tx *gorm.DB) error {
	t.UpdatedAt = time.Now().Unix()
	return nil
}

// TagResponse 标签 API 响应
type TagResponse struct {
	ID        uint   `json:"id"`
	Name      string `json:"name"`
	Slug      string `json:"slug"`
	CreatedAt string `json:"createdAt"`
	UpdatedAt string `json:"updatedAt"`
}

// PostTag 文章标签关联模型
type PostTag struct {
	PostID    uint  `json:"postId" gorm:"primaryKey;column:post_id"`
	TagID     uint  `json:"tagId" gorm:"primaryKey;column:tag_id"`
	CreatedAt int64 `json:"createdAt" gorm:"column:created_at"`
}

// TableName 指定表名
func (PostTag) TableName() string {
	return "post_tags"
}

// BeforeCreate 创建前钩子
func (pt *PostTag) BeforeCreate(tx *gorm.DB) error {
	if pt.CreatedAt == 0 {
		pt.CreatedAt = time.Now().Unix()
	}
	return nil
}