<?php
$access_token = '';
function librus_login($username, $password)
{
	global $access_token;
	$ch = curl_init();

	curl_setopt($ch, CURLOPT_URL,"https://api.librus.pl/OAuth/Token");
	curl_setopt($ch, CURLOPT_POST, 1);
	curl_setopt($ch, CURLOPT_POSTFIELDS,
	            "username=$username&password=$password&grant_type=password");
	curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/x-www-form-urlencoded',
    'Cache-Control: no-cache',
    //'Authorization: Basic wmSyUMo8llDAs4y9tJVYY92oyZ6h4lAt7KCuy0Gv'
    'Authorization: Basic MzU6NjM2YWI0MThjY2JlODgyYjE5YTMzZjU3N2U5NGNiNGY='
//'Authorization: Basic Mjo1MmI2MmI4MjJkY2E1ZDQyODgxMTVhODNiOWM1ZDdjYw=='
    //'Authorization: Basic MC4wNjkyODcwMCAxNTI4NzAzMzEyXzZmZTljZjc1MDhjMzNkZThiNDYwMzQ0MDljYTY4NmNl'
	));

	// in real life you should use something like:
	// curl_setopt($ch, CURLOPT_POSTFIELDS,
	//          http_build_query(array('postvar1' => 'value1')));

	// receive server response ...
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

	$json = curl_exec ($ch);
	echo $json;
	curl_close ($ch);
	$result = json_decode($json, true);
	$access_token = $result['token_type'].' '.$result['access_token'];
}

function librus_get($url)
{
	global $access_token;
	$ch = curl_init();

	curl_setopt($ch, CURLOPT_URL,$url);
	curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Cache-Control: no-cache',
    'Authorization: '.$access_token
	));

	// in real life you should use something like:
	// curl_setopt($ch, CURLOPT_POSTFIELDS,
	//          http_build_query(array('postvar1' => 'value1')));

	// receive server response ...
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

	$json = curl_exec ($ch);

	curl_close ($ch);
	$result = json_decode($json, true);
	return $result;
}
header('Content-Type: text/plain');
librus_login('kuba.sz', 'haslo');
echo $access_token;
$grades = librus_get('https://api.librus.pl/2.0/Grades');
var_dump($grades);

foreach ($grades['Grades'] as $value) {
	echo $value['Grade'].' ';

}

$teachers = array();
foreach (librus_get('https://api.librus.pl/2.0/Users/')['Users'] as $value) {
	$teachers[$value['Id']] = $value['FirstName'].' '.$value['LastName'];
}
var_dump($teachers);

$subjects = array();
foreach (librus_get('https://api.librus.pl/2.0/Subjects/')['Subjects'] as $value) {
	$subjects[$value['Id']] = $value['Name'];
}
var_dump($subjects);

$grades_categories = array();
foreach (librus_get('https://api.librus.pl/2.0/Grades/Categories/')['Categories'] as $value) {
	$grades_categories[$value['Id']] = $value['Name'];
}
var_dump($grades_categories);