<?php
// +----------------------------------------------------------------------
// | YwxApp [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2026-2036 http://ywxapp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Author: ywxapp<admin@ywxapp.cn>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace addon\articles\model;

use think\facade\Db;
use think\model\Pivot;
use ywxapp\model\BaseModel;

/**
 * 专题-文章关联模型
 */
class ArticleTopicArticle extends Pivot
{
    protected $name = 'articles_topic_article';

    public $autoWriteTimestamp = false;

    /**
     * 某专题下的文章ID（按专题内排序）
     */
    public static function articleIdsOf(int $tid): array
    {
        if ($tid <= 0) {
            return [];
        }
        return self::where('tid', $tid)->order('sort', 'asc')->order('aid', 'desc')->column('aid');
    }

    /**
     * 某文章所属的专题ID
     */
    public static function topicIdsOf(int $aid): array
    {
        if ($aid <= 0) {
            return [];
        }
        return self::where('aid', $aid)->column('tid');
    }

    /**
     * 同步专题下的文章（先删后插，事务保护）
     *
     * @param int   $tid  专题ID
     * @param array $aids 文章ID数组（顺序即专题内排序）
     */
    public static function syncArticles(int $tid, array $aids): void
    {
        Db::transaction(function () use ($tid, $aids) {
            self::where('tid', $tid)->delete();

            $data = [];
            $sort = 0;
            foreach ($aids as $aid) {
                $aid = (int) $aid;
                if ($aid <= 0) {
                    continue;
                }
                $data[] = ['tid' => $tid, 'aid' => $aid, 'sort' => $sort++];
            }
            if ($data) {
                self::insertAll($data);
            }
        });
    }
}