{

public const LIST_OF_COURSES_FILTER_NAME = 'frontend_courses_list';

public function __construct()

{

parent::__construct();

if ($this->router->method !== 'show_details' && $this->router->method !== 'show_description') {

$this->usermanager->student_login_protected_redirect();

}

$this->_init_language_for_student();

$this->_load_student_langfile();

}

public function index(): void

{

$period_id = $this->input->post('period_id');

$filter = $this->inject_stored_filter();

$this->_initialize_student_menu();

$this->_select_student_menu_pagetag('courses');

$this->parser->add_css_file('frontend_courses.css');

$this->parser->add_js_file('courses/selection.js');

$cache_id = $this->usermanager->get_student_cache_id('period_' . ($period_id ?: @$filter['period_id']));

if (!$this->_is_cache_enabled()

|| !$this->parser->isCached($this->parser->find_view('frontend/courses/index.tpl'), $cache_id)

) {

$periods = new Period();

if ((int)$period_id === 0) {

if (isset($filter['period_id'])) {

$periods->where('id', $filter['period_id']);

} else {

$periods->limit(1);

}

} else {

$periods->where('id', $period_id);

}

$periods->order_by('sorting', 'asc')->get();

$filter['period_id'] = $periods->id;

$this->store_filter($filter);

$this->inject_period_options();

$this->parser->assign(['periods' => $periods]);

}

$this->parser->parse(

'frontend/courses/index.tpl',

[],

false,

$this->_is_cache_enabled(),

$cache_id

);

}

public function signup_to_course($course_id): void

{

$this->output->set_content_type('application/json');

$output = new stdClass();

$output->status = false;

$output->message = '';

$output->content = '';

$this->_transaction_isolation();

$this->db->trans_begin();

$student = new Student();

$student->get_by_id($this->usermanager->get_student_id());

$course = new Course();

$course->where('hide_in_lists', 0);

$course->get_by_id($course_id);

if ($course->exists()) {

if ($course->is_subscription_allowed()) {

if ($student->participant->where_related($course)->count() === 0) {

if ((bool)$course->auto_accept_students === true) {

$participants = new Participant();

$participants->where_related_course($course);

$participants->where('allowed', 1);

$participants_count = $participants->count();

if ($participants_count >= (int)$course->capacity) {

$output->message = $this->lang->line('courses_message_course_is_full');

$output->status = false;

$this->db->trans_rollback();

} else {

$participant = new Participant();

$participant->allowed = 1;

$participant->save([$student, $course]);

$this->db->trans_commit();

$output->message = sprintf(

$this->lang->line('courses_message_signed_up_for_course_approved'),

$this->lang->text($course->name)

);

$this->parser->assign('course', $course);

$output->content = $this->parser->parse(

'frontend/courses/single_course.tpl',

[],

true

);

$output->status = true;

$this->_action_success();

}

} else {

$participant = new Participant();

$participant->allowed = 0;

$participant->save([$student, $course]);

$this->db->trans_commit();

$output->message = sprintf(

$this->lang->line('courses_message_signed_up_for_course'),

$this->lang->text($course->name)

);

$this->parser->assign('course', $course);

$output->content = $this->parser->parse(

'frontend/courses/single_course.tpl',

[],

true

);

$output->status = true;

$this->_action_success();

}

} else {

$output->message = $this->lang->line(

'courses_message_already_in_course_or_waiting_for_approwal'

);

$this->db->trans_rollback();

}

} else {

$output->message = $this->lang->line('courses_message_subscription_disallowed');

$this->db->trans_rollback();

}

} else {

$output->message = $this->lang->line('courses_message_course_not_found');

$this->db->trans_rollback();

}

$this->output->set_output(json_encode($output));

}

public function activate_course($course_id): void

{

$this->_initialize_student_menu();

$this->output->set_content_type('application/json');

$output = new stdClass();

$output->status = false;

$output->message = '';

$output->content = '';

$output->metainfo = '';

$this->_transaction_isolation();

$this->db->trans_begin();

$student = new Student();

$student->get_by_id($this->usermanager->get_student_id());

$course = new Course();

$course->get_by_id($course_id);

if ($course->exists()) {

$participant = $student->participant->where_related($course)->where('allowed', 1)->get();

if ($participant->exists()) {

$student->save($course, 'active_course');

$this->db->trans_commit();

$this->usermanager->set_student_data_to_smarty();

$period = $course->period->get();

$output->content = $this->parser->parse(

'frontend/courses/period_courses.tpl',

['period' => $period],

true

);

$output->metainfo = $this->parser->parse(

'partials/frontend_general/selected_course.tpl',

[],

true

);

$output->status = true;

$output->message = sprintf(

$this->lang->line('courses_message_switched_to_course'),

$this->lang->text($course->name) . ' / ' . $this->lang->text($period->name)

);

$this->_action_success();

} else {

$output->message = $this->lang->line('courses_message_cant_switch_to_unsigned_course');

$this->db->trans_rollback();

}

} else {

$output->message = $this->lang->line('courses_message_course_not_found');

$this->db->trans_rollback();

}

$this->output->set_output(json_encode($output));

}

public function show_details($course_id, $lang = null): void

{

$this->parser->add_css_file('frontend_courses.css');

if (!is_null($lang)) {

$this->_init_specific_language($lang);

}

$cache_id = 'course_' . $course_id . '|lang_' . $this->lang->get_current_idiom();

if (!$this->_is_cache_enabled()

|| !$this->parser->isCached($this->parser->find_view('frontend/courses/course_details.tpl'), $cache_id)

) {

$course = new Course();

$course->include_related('period');

$course->get_by_id($course_id);

smarty_inject_days();

$this->parser->assign(['course' => $course]);

}

$this->parser->parse(

'frontend/courses/course_details.tpl',

[],

false,

$this->_is_cache_enabled(),

$cache_id

);

}

public function show_description($course_id, $lang = null): void

{

$this->parser->add_css_file('frontend_courses.css');

if (!is_null($lang)) {

$this->_init_specific_language($lang);

}

$cache_id = 'course_' . $course_id . '|lang_' . $this->lang->get_current_idiom();

if (!$this->_is_cache_enabled()

|| !$this->parser->isCached(

$this->parser->find_view('frontend/courses/show_description.tpl'),

$cache_id

)

) {

$course = new Course();

$course->include_related('period');

$course->get_by_id((int)$course_id);

smarty_inject_days();

$this->parser->assign(['course' => $course]);

}

$this->parser->parse(

'frontend/courses/show_description.tpl',

[],

false,

$this->_is_cache_enabled(),

$cache_id

);

}

public function course_description(): void

{

$this->parser->add_css_file('frontend_courses.css');

$this->_initialize_student_menu();

$this->_select_student_menu_pagetag('course_description');

$student = new Student();

$student->get_by_id($this->usermanager->get_student_id());

$course_id = $student->active_course_id ?? 'none';

$cache_id = 'student_' . $student->id . '|course_' . $course_id . '|lang_' . $this->lang->get_current_idiom();

if (!$this->_is_cache_enabled()

|| !$this->parser->isCached(

$this->parser->find_view('frontend/courses/course_description.tpl'),

$cache_id

)

) {

$course = new Course();

$course->include_related('period');

$course->get_by_id((int)$course_id);

smarty_inject_days();

$this->parser->assign(['course' => $course]);

}

$this->parser->parse(

'frontend/courses/course_description.tpl',

[],

false,

$this->_is_cache_enabled(),

$cache_id

);

}

public function quick_course_change($course_id, $current_url): void

{

$this->activate_course($course_id);

$output = $this->output->get_output();

$output_object = json_decode($output);

$this->messages->add_message(

$output_object->message,

$output_object->status ? Messages::MESSAGE_TYPE_SUCCESS : Messages::MESSAGE_TYPE_ERROR

);

$decoded_current_url = decode_from_url($current_url);

redirect($decoded_current_url);

}

private function inject_period_options(): void

{

$periods = new Period();

$periods->order_by('sorting', 'asc')->get_iterated();

$data = [];

foreach ($periods as $period) {

$data[$period->id] = $period->name;

}

$this->parser->assign('period_options', $data);

}

private function store_filter($filter): void

{

if (is_array($filter)) {

$this->load->library('filter');

$old_filter = $this->filter->restore_filter(self::LIST_OF_COURSES_FILTER_NAME);

$new_filter = is_array($old_filter) ? array_merge($old_filter, $filter) : $filter;

$this->filter->store_filter(self::LIST_OF_COURSES_FILTER_NAME, $new_filter);

}

}

private function inject_stored_filter(): array

{

$this->load->library('filter');

$filter = $this->filter->restore_filter(self::LIST_OF_COURSES_FILTER_NAME);

$this->parser->assign('filter', $filter);

return $filter;

}

}