package api

import (
	"reflect"
	"time"
)

type Image struct {
	ID                   int       `json:"id"                      db:"id"`
	Width                int       `json:"width"                   db:"width"`
	Height               int       `json:"height"                  db:"height"`
	Content              string    `json:"content"                 db:"content"`
	Remark               string    `json:"remark"                  db:"remark"`
	Description          string    `json:"description"             db:"description"`
	Tags                 string    `json:"tags"                    db:"tags"`
	Rank                 string    `json:"rank"                    db:"rank"`
	CommentNum           int       `json:"comment_num"             db:"comment_num"`
	ArticleCategoryTopId int       `json:"article_category_top_id" db:"article_category_top_id"`
	PraiseCount          int       `json:"praise_count"            db:"praise_count"`
	CollectCount         int       `json:"collect_count"           db:"collect_count"`
	ArticleID            int       `json:"article_id"              db:"article_id"`
	UserID               int       `json:"user_id"                 db:"user_id"`
	User                 User      `json:"user"                    db:"-"`
	Article              Article   `json:"article"                 db:"-"`
	CreateTime           time.Time `json:"create_time"             db:"create_time"`
	UpdateTime           time.Time `json:"update_time"             db:"update_time"`
}

type User struct {
	ID         int       `json:"id"          db:"id"`
	UserName   *string   `json:"user_name"   db:"user_name"`
	Avatar     *string   `json:"avatar"      db:"avatar"`
	Rank       *string   `json:"rank"        db:"rank"`
	CreateTime time.Time `json:"create_time" db:"create_time"`
	UpdateTime time.Time `json:"update_time" db:"update_time"`
}

type Article struct {
	ID         int       `json:"id"          db:"id"`
	Title      string    `json:"title"       db:"title"`
	Tags       string    `json:"tags"        db:"tags"`
	CreateTime time.Time `json:"create_time" db:"create_time"`
	UpdateTime time.Time `json:"update_time" db:"update_time"`
}

// 利用反射获取每个结构体所有字段
func getFields(s interface{}) (fields []string) {
	t := reflect.TypeOf(s)
	for i := 0; i < t.NumField(); i++ {
		fields = append(fields, t.Field(i).Name)
	}
	return fields
}

// 检查字段是否存在
func checkFields(fields []string, fields_list []string) bool {
	for _, field := range fields {
		if !contains(fields_list, field) {
			return false
		}
	}
	return true
}

// 判断字符串是否存在于字符串数组中
func contains(s []string, e string) bool {
	for _, v := range s {
		if v == e {
			return true
		}
	}
	return false
}

func QueryUserList(fields []string) (user_list []User) {
	if !checkFields(fields, getFields(User{})) {
		return
	}

	return
}