package model

import (
	"time"

	"github.com/google/uuid"
	"gorm.io/gorm"
)

// PostStatus 帖子状态
type PostStatus string

const (
	PostStatusDraft     PostStatus = "draft"
	PostStatusPending   PostStatus = "pending" // 待审核
	PostStatusPublished PostStatus = "published"
	PostStatusRejected  PostStatus = "rejected"
	PostStatusDeleted   PostStatus = "deleted"
)

// Post 帖子实体
type Post struct {
	ID          string `json:"id" gorm:"type:varchar(36);primaryKey"`
	UserID      string `json:"user_id" gorm:"type:varchar(36);index;index:idx_posts_user_status_created,priority:1;not null"`
	CommunityID string `json:"community_id" gorm:"type:varchar(36);index"`
	Title       string `json:"title" gorm:"type:varchar(200);not null"`
	Content     string `json:"content" gorm:"type:text;not null"`

	// 关联
	// User 需要参与缓存序列化；否则列表命中缓存后会丢失作者信息，前端退化为“匿名用户”
	User   *User       `json:"user,omitempty" gorm:"foreignKey:UserID"`
	Images []PostImage `json:"images" gorm:"foreignKey:PostID"`

	// 审核状态
	Status       PostStatus `json:"status" gorm:"type:varchar(20);default:published;index:idx_posts_status_created,priority:1;index:idx_posts_user_status_created,priority:2"`
	ReviewedAt   *time.Time `json:"reviewed_at" gorm:"type:timestamp"`
	ReviewedBy   string     `json:"reviewed_by" gorm:"type:varchar(50)"`
	RejectReason string     `json:"reject_reason" gorm:"type:varchar(500)"`

	// 统计
	LikesCount     int     `json:"likes_count" gorm:"column:likes_count;default:0"`
	CommentsCount  int     `json:"comments_count" gorm:"column:comments_count;default:0"`
	FavoritesCount int     `json:"favorites_count" gorm:"column:favorites_count;default:0"`
	SharesCount    int     `json:"shares_count" gorm:"column:shares_count;default:0"`
	ViewsCount     int     `json:"views_count" gorm:"column:views_count;default:0"`
	HotScore       float64 `json:"hot_score" gorm:"column:hot_score;default:0;index:idx_posts_hot_score_created,priority:1"`

	// 置顶/锁定
	IsPinned  bool `json:"is_pinned" gorm:"default:false"`
	IsLocked  bool `json:"is_locked" gorm:"default:false"`
	IsDeleted bool `json:"-" gorm:"default:false"`

	// 投票
	IsVote bool `json:"is_vote" gorm:"column:is_vote;default:false"`

	// 软删除
	DeletedAt gorm.DeletedAt `json:"-" gorm:"index"`

	// 时间戳
	CreatedAt time.Time `json:"created_at" gorm:"autoCreateTime;index:idx_posts_status_created,priority:2,sort:desc;index:idx_posts_user_status_created,priority:3,sort:desc;index:idx_posts_hot_score_created,priority:2,sort:desc"`
	UpdatedAt time.Time `json:"updated_at" gorm:"autoUpdateTime"`
}

// BeforeCreate 创建前生成UUID
func (p *Post) BeforeCreate(tx *gorm.DB) error {
	if p.ID == "" {
		p.ID = uuid.New().String()
	}
	return nil
}

func (Post) TableName() string {
	return "posts"
}

// PostImage 帖子图片
type PostImage struct {
	ID           string    `json:"id" gorm:"type:varchar(36);primaryKey"`
	PostID       string    `json:"post_id" gorm:"type:varchar(36);index;not null"`
	URL          string    `json:"url" gorm:"type:text;not null"`
	ThumbnailURL string    `json:"thumbnail_url" gorm:"type:text"`
	Width        int       `json:"width" gorm:"default:0"`
	Height       int       `json:"height" gorm:"default:0"`
	Size         int64     `json:"size" gorm:"default:0"` // 文件大小（字节）
	MimeType     string    `json:"mime_type" gorm:"type:varchar(50)"`
	SortOrder    int       `json:"sort_order" gorm:"default:0"`
	CreatedAt    time.Time `json:"created_at" gorm:"autoCreateTime"`
}

// BeforeCreate 创建前生成UUID
func (pi *PostImage) BeforeCreate(tx *gorm.DB) error {
	if pi.ID == "" {
		pi.ID = uuid.New().String()
	}
	return nil
}

func (PostImage) TableName() string {
	return "post_images"
}