/**
* __get function.
*
* @param string $key
*
* @return mixed
*/
public function __get($key)
{
if (empty($this->{$key})) {
$value = false;
switch ($key) {
case 'current_item':
$item_type = !empty($_REQUEST['course-item']) ? $_REQUEST['course-item'] : '';
if ($item_type) {
$item_id = ($item_id = learn_press_get_request("{$item_type}_id")) && $this->has('item', $item_id) ? $item_id : null;
if ($item_id) {
$value = $item_type == 'lesson' ? LP_Lesson::get_lesson($item_id) : LP_Quiz::get_quiz($item_id);
}
}
break;
case 'current_lesson':
$lesson_id = ($lesson_id = learn_press_get_request("lesson_id")) && $this->has('item', $lesson_id) ? $lesson_id : null;
if ($lesson_id) {
$value = LP_Lesson::get_lesson($lesson_id);
}
break;
case 'permalink':
$value = get_the_permalink($this->id);
break;
default:
// default is get course meta key
$value = get_post_meta($this->id, '_lp_' . $key, true);
}
if (!empty($value)) {
$this->{$key} = $value;
}
}
return !empty($this->{$key}) ? $this->{$key} : null;
}
/**
* The class of lesson in course curriculum
*
* @param int $lesson_id
* @param array|string $class
*/
function learn_press_course_lesson_class($lesson_id = null, $class = null)
{
if (is_string($class) && $class) {
$class = preg_split('!\\s+!', $class);
} else {
$class = array();
}
$classes = array('course-lesson course-item');
if (learn_press_user_has_completed_lesson($lesson_id)) {
$classes[] = "completed";
}
if ($lesson_id && !empty($_REQUEST['lesson']) && $lesson_id == $_REQUEST['lesson']) {
$classes[] = 'current';
}
if (is_course()) {
$course = LP()->course;
if ($course->is_free()) {
$classes[] = 'free-item';
}
}
$lesson = LP_Lesson::get_lesson($lesson_id);
if ($lesson && $lesson->is_previewable()) {
$classes[] = 'preview-item';
}
$classes = array_unique(array_merge($classes, $class));
echo 'class="' . implode(' ', $classes) . '"';
}
/**
* Return true if user can view a lesson
*
* @param int $lesson_id
* @param int $course_id
*
* @return bool
*/
function can_view_lesson($lesson_id, $course_id = null)
{
$lesson = LP_Lesson::get_lesson($lesson_id);
$view = $lesson->is('previewable') || $this->get_item_order($lesson_id);
if (!$view && $course_id && ($course = LP_Course::get_course($course_id)) && !$course->is('required_enroll')) {
$view = true;
}
return apply_filters('learn_press_user_view_lesson', $view, $lesson_id, $this, $course_id);
}
