56 lines
1.9 KiB
PHP
56 lines
1.9 KiB
PHP
<?php
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/**
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* Created by PhpStorm.
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* User: leanderschmedemann
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* Date: 27/03/2017
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* Time: 14:07
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*/
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require_once('includes.inc.php');
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$data = '';
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$error = 0;
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$values = null;
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$uid = isset($_GET['uid']) ? $_GET['uid'] : '';
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$length = isset($_GET['length']) ? $_GET['length'] : '';
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$length = (($length === '0') || ($length && gettype(+$length) == 'integer')) ? +$_GET['length'] : 10;
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$db = new Database();
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$questions_count = $db->query('SELECT COUNT(*) FROM "Questions"')['data'][0]['count'];
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// Return $count random, non repeating numbers in range from $min to $max.
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function random_numbers($min, $max, $count){
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$numbers = range($min, $max);
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shuffle($numbers);
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return array_slice($numbers, 0, $count);
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}
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if($uid == '') {
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$error = 12101;
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} else if($length == 0) {
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$error = 12102;
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} else if($length > $questions_count) {
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$error = 12103;
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$values = array($questions_count);
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} else {
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// Delete existing game for user.
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if($db->query('SELECT EXISTS (SELECT 1 FROM "Games" WHERE "ID" = $1)', array($uid))['data'][0]['exists'] == 't') {
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$db->query('DELETE FROM "Games" WHERE "ID" = $1', array($uid));
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}
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// Create new game for user.
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$db->query('INSERT INTO "Games" ("ID") VALUES ($1)', array($uid));
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if(preg_match('/violates foreign key constraint "Games_ID_fkey"/', pg_last_error()) == 1) {
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$error = 12104;
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}
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// Find questions for new game and insert into table.
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$questions = random_numbers(0, $questions_count-1, $length);
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foreach($questions as $question) {
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$q = $db->query('SELECT "ID" FROM "Questions" OFFSET $1 LIMIT 1', array($question))['data'][0]['ID'];
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$db->query('INSERT INTO "GamesQuestions" ("Games_ID", "Questions_ID") VALUES ($1, $2)', array($uid, $q));
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}
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}
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$next_question = Question::get_next_question($db, $uid);
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$data = array('next' => $next_question);
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$response = Database::create_response($data, $error, $values);
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print_r($response);
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?>
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