<?php

namespace app\common\model\app\exam;
use think\Model;
use app\common\model\app\exam\Exercises;
use app\common\model\app\exam\WarehouseQuestion;
use app\common\model\app\exam\ExercisesBindWarehouseGroup;
/**
 * 题库练习记录
 */
class ExercisesLog extends Model
{
    // 表名,不含前缀
    protected $name = 'app_exam_exercises_log';
    // 自动写入时间戳字段
    protected $autoWriteTimestamp = false;
    // 定义时间戳字段名
    protected $createTime = false;
    protected $updateTime = false;
    // 追加属性
    protected $append = [
    ];


    /**
     * 出题
     * @return void
     */
    public function buildLog($userId,$exercisesId)
    {
        //获取出题配置
        $exercisesInfo = Exercises::where([
            'exercises_id'=>$exercisesId,
            'stutus'=>1
        ])->find();

        if(!$exercisesInfo){
            return false;
        }

        $questionIds = $this->getQuestionIds($userId,$exercisesId,$exercisesInfo['question_mode'],$exercisesInfo['question_count']);

        if(!$questionIds){
            return false;
        }

        $logId = self::insertGetId([
            'user_id'=>$userId,
            'uniacid'=>UNIACID,
            'exercises_id'=>$exercisesId,
            'question_ids'=>implode(",",$questionIds),
            'data_index'=>'',
            'question_count'=>count($questionIds),
            'result_true_count'=>0,
            'createtime'=>time()
        ]);

        if(!$logId){
            return false;
        }

        return $logId;
    }

    public function getQuestionList($userId,$exercisesId){

        //获取出题配置
        $exercisesInfo = Exercises::where([
            'id'=>$exercisesId,
            'status'=>1
        ])->find();

        if(!$exercisesInfo){
            return false;
        }

        $questionIds = $this->getQuestionIds($userId,$exercisesId,$exercisesInfo['question_mode'],$exercisesInfo['question_count']);

        if(!$questionIds){
            return false;
        }

        $questionList = WarehouseQuestion::where([
            'id'=>['in',$questionIds]
        ])->select();

        if(!$questionList){
            return false;
        }

        foreach ($questionList as &$item){
            $item->option = json_decode($item->option,true);

            switch ($item['type']){
                case 'multiple':
                case 'indefinite':
                    $item->answer = explode(",",$item->answer);
                    break;
                case 'fillblank':
                    $item->answer = json_decode($item->answer,true);
                    break;
                case 'essay':
                    // 问答题答案为富文本字符串，保持原样
                    break;
                default:
                    $item->answer = intval($item->answer);
            }
        }

        return $questionList;
    }


    public function getQuestionIds($userId,$exercisesId,$mode,$count){

        if($mode == 'random'){
            $questionIds = $this->getRandomQuestion($exercisesId,$count);
        }else{

            //        判断是否已经过题了
            $exercisesLog = self::where([
                'exercises_id'=>$exercisesId,
                'user_id'=>$userId
            ])->order('createtime','desc')->find();

            $dataIndex = 0;
            if($exercisesLog){
                $dataIndex = $exercisesLog['index'];
            }
            $questionIds = $this->getSortQuestion($exercisesId,$dataIndex,$count);
        }

        if(!$questionIds){
            return false;
        }

        shuffle($questionIds);

        return $questionIds;
    }


    /**
     * 随机出题
     * @return void
     */
    public function getRandomQuestion($exercisesId,$count){

        $groupIds = ExercisesBindWarehouseGroup::getNotInExercisesGroupIds($exercisesId);

        if(!$groupIds){
            return false;
        }

        $questionIds = WarehouseQuestion::where(['group_id'=>['not in',$groupIds]])->orderRaw('rand()')->limit($count)->field('id')->column('id');

        if(!$questionIds){
            return false;
        }

        return $questionIds;
    }


    /**
     * 顺序出题
     * @param $exercisesId 练习
     * @param $dataIndex 上次查询的下标
     * @param $count 获取数量
     * @return void
     */
    public function getSortQuestion($exercisesId,$dataIndex,$count){

    }

}