<?php

/**
 * Created by PhpStorm.
 * User: leanderschmedemann
 * Date: 01/04/2017
 * Time: 10:08
 */

require_once('includes.inc.php');

class Question
{
    private $question;
    private $answers;
    private $correct_answer_position;
    private $category_id;
    private $category;

    function __construct($db, $id) {
        $question_details = $db->query('SELECT "question", "answer0", "answer1", "answer2", "answer3", "Categories_ID"
          FROM "Questions" WHERE "ID" = $1', array($id));
        $q = $question_details[0];
        $a0 = $question_details[1];
        $a1 = $question_details[2];
        $a2 = $question_details[3];
        $a3 = $question_details[4];
        $cid = $question_details[5];
        $c = $db->query('SELECT "name" FROM "Categories" WHERE "ID" = $1', array($cid));
        $this->question = $q;
        $this->answers = array('a0' => $a0, 'a1' => $a1, 'a2' => $a2, 'a3' => $a3);
        shuffle($this->answers);
        $this->correct_answer_position = array_search('a0', $this->answers);
        $this->category_id = $cid;
        $this->category = $c;
    }

    public static function get_next_question($db, $uid) {
        $qid = $db->query('SELECT "Questions_ID" FROM "GamesQuestions" WHERE "Games_ID" = $1 LIMIT 1', array($uid))['data'][0]['ID'];
        $question = new Question($db, $qid);
        $db->query('DELETE FROM "GamesQuestions" WHERE "Games_ID" = $1 AND "Questions_ID" = $2', array($uid, $qid));
        $question_object = $question->get_question_object();
        return $question_object;
    }

    // Create the question message for API.
    function get_question_object() {
        $question_object = array(
            'categoryID' => $this->category_id,
            'categoryName' => $this->category,
            'question' => $this->question,
            'answers' => [$this->answers['a0'], $this->answers['a1'], $this->answers['a2'], $this->answers['a3']]
        );
        return $question_object;
    }

}