<?php
/**
 * Created by PhpStorm.
 * User: leanderschmedemann
 * Date: 27/03/2017
 * Time: 14:07
 */

    require_once('includes.inc.php');
    $data = '';
    $error = 0;
    $values = null;
    $uid = $_GET['uid'];
    $length = $_GET['length'];
    $length = (($length === '0') || ($length && gettype(+$length) == 'integer')) ? +$_GET['length'] : 10;
    $database = new Database();
    $questions_count = $database->query('SELECT COUNT(*) FROM "Questions"')['data'][0]['count'];

    if($length == 0) {
        $error = 12101;
    } else if($length > $questions_count) {
        $error = 12102;
        $values = array($questions_count);
    } else {
        if($database->query('SELECT EXISTS (SELECT 1 FROM "Games" WHERE "ID" = $1)', array($uid)) == 't') {
            $database->query('DELETE FROM "Games" WHERE "ID" = $1', array($uid));
        }
        $database->query('INSERT INTO "Games" ("ID") VALUES ($1)', array($uid));
        for($i = 0; $i < $length; $i++) {
            do {
                $offset = rand(0, $questions_count-1);
                $question = $database->query('SELECT "ID" FROM "Questions" OFFSET $1 LIMIT 1', array($offset));
                $database->query('INSERT INTO "GamesQuestions" ("Games_ID", "Questions_ID") VALUES ($1, $2)',
                    array($uid, $question));
            } while(pg_last_error != '');
        }
    }
    $response = Database::create_response($data, $error, $values);
    print $response;
?>