<?php
if (!class_exists('crm_users')) require_once("../common_cadline_libraries/crm_users.class.php");

define('_JEXEC', 1);
define('DS', DIRECTORY_SEPARATOR);
define('JPATH_BASE', $_SERVER['DOCUMENT_ROOT']);

require_once(JPATH_BASE . DS . 'includes' . DS . 'defines.php');
require_once(JPATH_BASE . DS . 'includes' . DS . 'framework.php');

jimport('joomla.user.helper');

$url        = $_POST['url'];
$id         = $_POST['course'];
$lessonID   = $_POST['lesson'];
$app        = JFactory::getApplication('site');
$user       = JFactory::getUser();

$course     = (object)Course::getCourseByUrl($url);
$lessons    = json_decode($course->lessons);
$i          = 0;

foreach ($lessons->courses as $key => $lesson) {
    $i += count($lesson->lessons->name);
}

$courseApplication  = Course::getCourseApplication($course->id, $user->id);
$coursePercentage   = round(100 / $i);

$courseArray    = (array)$lessons->courses;
$selectedCourse = $courseArray[$id];
$lastLesson     = count($selectedCourse->lessons->name);
$courses        = (array)$lessons->courses;

if ($user->id > 0) {
    if (empty($courseApplication)) {
        $completedCourses[$id] = array();
        array_push($completedCourses[$id], (int)$lessonID);
        $jsonStr = '{"courses":' . json_encode($completedCourses, JSON_UNESCAPED_UNICODE) . '}';

        $courseApp = array(
            'course_id'         => $course->id,
            'user_id'           => $user->id,
            'percentage'        => $coursePercentage
        );

        $id = Database::getInstance()->insert(JMLADATBAZIS . ".aleducation_applications", $courseApp, 'iii');

        $query = "UPDATE `" . JMLADATBAZIS . "`.`aleducation_applications` SET completedCourses = ? WHERE id = ?";
        Database::getInstance()->query($query, array('si', $jsonStr, $id));
    } else {
        $completedCourses = (array)json_decode($courseApplication['completedCourses'])->courses;

        if ($completedCourses[$id] == null || !in_array($lessonID, $completedCourses[$id])) {
            if ($completedCourses[$id] == null)
                $completedCourses[$id] = array();

            array_push($completedCourses[$id], (int)$lessonID);

            $courseCounter  = 0;
            $allLesson      = 0;

            foreach ($completedCourses as $completedCourse) {
                $courseCounter += count($completedCourse);
            }

            foreach ($courses as $lessonArray) {
                $allLesson += count($lessonArray->lessons->name);
            }

            $percentage = round(($courseCounter / $allLesson) * 100);

            $updatedJson = '{"courses":' . json_encode($completedCourses, JSON_UNESCAPED_UNICODE) . '}';

            $query = "UPDATE `" . JMLADATBAZIS . "`.`aleducation_applications` SET completedCourses = ?, percentage = ? WHERE user_id = ? AND course_id = ?";
            Database::getInstance()->query($query, array('siii', $updatedJson, $percentage, $user->id, $course->id));
        }
    }
}

if ((int)$lessonID < ($lastLesson - 1)) {
    $nextCourse = $id;
    $nextLesson = $lessonID + 2;
} else {
    while (current($courseArray) !== $selectedCourse && key($courseArray) !== null)
        next($courseArray);

    next($courseArray);
    $key = key($courseArray);

    $nextCourse = $key;
    $nextLesson = 1;
}

$newUrl = 'https://' . $_SERVER['HTTP_HOST'] . '/' . $url . '/';
$newUrl .= $nextCourse . '/' . $nextLesson;

header("Location: {$newUrl}");