package models

import (
	"time"

	"gorm.io/gorm"
)

// Post 博客文章模型
type Post struct {
	ID          uint      `json:"id" gorm:"primaryKey;column:id"`
	OriginalID  string    `json:"originalId,omitempty" gorm:"-"` // For backward compatibility
	Title       string    `json:"title" gorm:"column:title"`
	CategoryID  uint      `json:"categoryId" gorm:"column:category_id"`
	Category    *Category `json:"category,omitempty" gorm:"foreignKey:CategoryID"` // For join query result
	Excerpt     string    `json:"excerpt" gorm:"column:excerpt"`
	Content     string    `json:"content" gorm:"column:content;type:text"`
	ReadCount   uint      `json:"readCount" gorm:"column:read_count;default:0"`
	IsPublished int       `json:"isPublished" gorm:"column:is_published;default:0"` // 0: draft, 1: published
	Tags        []Tag     `json:"tags" gorm:"many2many:post_tags;joinForeignKey:post_id;joinReferences:tag_id"`
	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 (Post) TableName() string {
	return "posts"
}

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

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

// PostResponse 博客文章响应模型
type PostResponse struct {
	ID           uint   `json:"id"`
	Title        string `json:"title"`
	CategoryID   uint   `json:"categoryId"`
	CategoryName string `json:"categoryName"`
	CategorySlug string `json:"categorySlug"`
	Date         string `json:"date"`
	Excerpt      string `json:"excerpt,omitempty"`
	Content      string `json:"content,omitempty"`
	Tags         []Tag  `json:"tags,omitempty"`
}

// PostHistory 文章历史记录模型
type PostHistory struct {
	ID          uint   `json:"id" gorm:"primaryKey;column:id"`
	PostID      uint   `json:"postId" gorm:"column:post_id;index"`
	Version     int    `json:"version" gorm:"column:version"`
	Title       string `json:"title" gorm:"column:title"`
	CategoryID  uint   `json:"categoryId" gorm:"column:category_id"`
	Excerpt     string `json:"excerpt" gorm:"column:excerpt"`
	Content     string `json:"content" gorm:"column:content;type:text"`
	IsPublished int    `json:"isPublished" gorm:"column:is_published"`
	ModifiedBy  uint   `json:"modifiedBy" gorm:"column:modified_by"`
	ModifiedAt  int64  `json:"modifiedAt" gorm:"column:modified_at"`
	CreatedAt   int64  `json:"createdAt" gorm:"column:created_at"`
}

// TableName 指定表名
func (PostHistory) TableName() string {
	return "post_history"
}

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

// PostHistoryResponse 文章历史记录响应模型
type PostHistoryResponse struct {
	ID           uint   `json:"id"`
	PostID       uint   `json:"postId"`
	Version      int    `json:"version"`
	Title        string `json:"title"`
	CategoryID   uint   `json:"categoryId"`
	CategoryName string `json:"categoryName"`
	Date         string `json:"date"`
	IsPublished  int    `json:"isPublished"`
	ModifiedBy   uint   `json:"modifiedBy"`
	ModifiedAt   string `json:"modifiedAt"`
	CreatedAt    string `json:"createdAt"`
}