<?php

namespace App\Services;

use App\Models\Answer;
use App\Models\Problem;
use App\Models\User;
class ProblemService
{
    public static function problems(array $list)
    {
        $ids = array_column($list, 'id');
        $answer = Answer::getList($ids);
        return self::mergeProblem($list, $answer);
    }
    public static function mergeProblem(array $list,array $answer){
        $answer = array_column($answer, null,'problem_id');
        foreach ($list as &$item){
            if (strtotime($item['created_at']) < strtotime('-3 days')){
                $item['is_new'] = 0;
            }else{
                $item['is_new'] = 1;
            }
            if (isset($answer[$item['problem_id']])){
                $item['answer'] = $answer[$item['problem_id']];
            }else{
                $item['answer'] = new class {};
            }
        }
        return $list;
    }

    public static function getProblemRecommendList(int $limit,int $page)
    {
        $list = Problem::getList($page,$limit);
        $userList = array_column($list,'user_id');
        $atUserList = array_column($list,'at_user_id');
        $userList = array_unique(array_merge($userList,$atUserList));
        $userInfoList = User::getUserListInUserIds($userList);
        return ['list'=>$list,'userList'=>$userInfoList];
    }
}