backend/internal/model/comment.go

package model

import (
	"time"

	"gorm.io/gorm"
)

// CommentStatus 评论状态
type CommentStatus string

const (
	CommentStatusDraft     CommentStatus = "draft"
	CommentStatusPending   CommentStatus = "pending"
	CommentStatusPublished CommentStatus = "published"
	CommentStatusRejected  CommentStatus = "rejected"
	CommentStatusDeleted   CommentStatus = "deleted"
)

// Comment 评论实体
type Comment struct {
	ID       string          `json:"id" gorm:"type:varchar(36);primaryKey"`
	PostID   string          `json:"post_id" gorm:"type:varchar(36);not null;index:idx_comments_post_parent_status_created,priority:1"`
	UserID   string          `json:"user_id" gorm:"type:varchar(36);index;not null"`
	ParentID *string         `json:"parent_id" gorm:"type:varchar(36);index:idx_comments_post_parent_status_created,priority:2"` // 父评论 ID（支持嵌套）
	RootID   *string         `json:"root_id" gorm:"type:varchar(36);index:idx_comments_root_status_created,priority:1"`          // 根评论 ID（用于高效查询）
	Content  string          `json:"content" gorm:"type:text;not null"`
	Segments MessageSegments `json:"segments,omitempty" gorm:"type:text"`
	Images   string          `json:"images" gorm:"type:text"` // 图片URL列表，JSON数组格式

	// 关联
	User    *User      `json:"-" gorm:"foreignKey:UserID"`
	Replies []*Comment `json:"-" gorm:"-"` // 子回复（手动加载，非 GORM 关联）

	// 审核状态
	Status       CommentStatus `json:"status" gorm:"type:varchar(20);default:published;index:idx_comments_post_parent_status_created,priority:3;index:idx_comments_root_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:"default:0"`
	RepliesCount int `json:"replies_count" gorm:"default:0"`

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

	// 时间戳
	CreatedAt time.Time `json:"created_at" gorm:"autoCreateTime;index:idx_comments_post_parent_status_created,priority:4,sort:asc;index:idx_comments_root_status_created,priority:3,sort:asc"`
	UpdatedAt time.Time `json:"updated_at" gorm:"autoUpdateTime"`
}

// BeforeCreate 创建前生成UUID
func (c *Comment) BeforeCreate(tx *gorm.DB) error {
	SetUUIDIfEmpty(&c.ID)
	return nil
}

func (Comment) TableName() string {
	return "comments"
}

// CommentLike 评论点赞
type CommentLike struct {
	ID        string    `json:"id" gorm:"type:varchar(36);primaryKey"`
	CommentID string    `json:"comment_id" gorm:"type:varchar(36);not null;uniqueIndex:idx_comment_like_user,priority:1"`
	UserID    string    `json:"user_id" gorm:"type:varchar(36);not null;uniqueIndex:idx_comment_like_user,priority:2"`
	CreatedAt time.Time `json:"created_at" gorm:"autoCreateTime"`
}

// BeforeCreate 创建前生成UUID
func (cl *CommentLike) BeforeCreate(tx *gorm.DB) error {
	SetUUIDIfEmpty(&cl.ID)
	return nil
}

func (CommentLike) TableName() string {
	return "comment_likes"
}