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locallib.php
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locallib.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Internal library of functions for module ratingallocate
*
* All the ratingallocate specific functions, needed to implement the module
* logic, should go here. Never include this file from your lib.php!
*
* @package mod_ratingallocate
* @copyright 2014 M Schulze
* @copyright based on code by Stefan Koegel copyright (C) 2013 Stefan Koegel
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
use core_availability\info_module;
use mod_ratingallocate\task\distribute_unallocated_task;
use ratingallocate\db as this_db;
global $CFG;
require_once(dirname(__FILE__) . '/lib.php');
require_once(dirname(__FILE__) . '/form_manual_allocation.php');
require_once(dirname(__FILE__) . '/form_modify_choice.php');
require_once(dirname(__FILE__) . '/form_upload_choices.php');
require_once(dirname(__FILE__) . '/renderable.php');
require_once($CFG->dirroot . '/group/lib.php');
require_once($CFG->dirroot . '/repository/lib.php');
require_once(__DIR__ . '/classes/algorithm_status.php');
// Takes care of loading all the solvers.
require_once(dirname(__FILE__) . '/solver/ford-fulkerson-koegel.php');
require_once(dirname(__FILE__) . '/solver/edmonds-karp.php');
// Now come all the strategies.
require_once(dirname(__FILE__) . '/strategy/strategy01_yes_no.php');
require_once(dirname(__FILE__) . '/strategy/strategy02_yes_maybe_no.php');
require_once(dirname(__FILE__) . '/strategy/strategy03_lickert.php');
require_once(dirname(__FILE__) . '/strategy/strategy04_points.php');
require_once(dirname(__FILE__) . '/strategy/strategy05_order.php');
require_once(dirname(__FILE__) . '/strategy/strategy06_tickyes.php');
/**
* Simulate a static/singleton class that holds all the strategies that registered with him
*/
class strategymanager {
/** @var array of string-identifier of all registered strategies */
private static $strategies = array();
/**
* Add a strategy to the strategymanager
* @param string $strategyname
*/
public static function add_strategy($strategyname) {
self::$strategies[] = $strategyname;
}
/**
* Get the current list of strategies
* @return array
*/
public static function get_strategies() {
return self::$strategies;
}
}
define('ACTION_GIVE_RATING', 'give_rating');
define('ACTION_DELETE_RATING', 'delete_rating');
define('ACTION_SHOW_CHOICES', 'show_choices');
define('ACTION_EDIT_CHOICE', 'edit_choice');
define('ACTION_UPLOAD_CHOICES', 'upload_choices');
define('ACTION_ENABLE_CHOICE', 'enable_choice');
define('ACTION_DISABLE_CHOICE', 'disable_choice');
define('ACTION_DELETE_CHOICE', 'delete_choice');
define('ACTION_START_DISTRIBUTION', 'start_distribution');
define('ACTION_DELETE_ALL_RATINGS', 'delete_all_ratings');
define('ACTION_MANUAL_ALLOCATION', 'manual_allocation');
define('ACTION_DISTRIBUTE_UNALLOCATED_FILL', 'distribute_unallocated_fill');
define('ACTION_DISTRIBUTE_UNALLOCATED_EQUALLY', 'distribute_unallocated_equally');
define('ACTION_PUBLISH_ALLOCATIONS', 'publish_allocations'); // Make them displayable for the users.
define('ACTION_SOLVE_LP_SOLVE', 'solve_lp_solve'); // Instead of only generating the mps-file, let it solve.
define('ACTION_SHOW_RATINGS_AND_ALLOCATION_TABLE', 'show_ratings_and_allocation_table');
define('ACTION_SHOW_ALLOCATION_TABLE', 'show_allocation_table');
define('ACTION_SHOW_STATISTICS', 'show_statistics');
define('ACTION_ALLOCATION_TO_GROUPING', 'allocation_to_gropuping');
/**
* Wrapper for db-record to have IDE autocomplete feature of fields
* @property int $id
* @property int $course
* @property string $name
* @property string $intro
* @property string $strategy
* @property int $accesstimestart
* @property int $accesstimestop
* @property int $publishdate
* @property int $published
* @property int $notificationsend
* @property int $runalgorithmbycron
* @property int $algorithmstarttime
* @property int $algorithmstatus
* -1 failure while running algorithm;
* 0 algorithm has not been running;
* 1 algorithm running;
* 2 algorithm finished;
* @property string $setting
*/
class ratingallocate_db_wrapper {
/** @var stdClass */
public $dbrecord;
/** Emulates the functionality as if there were explicit records by passing them to the original db record
*
* @param string $name
* @return mixed
*/
public function __get($name) {
return $this->dbrecord->{$name};
}
public function __construct($record) {
$this->dbrecord = $record;
}
}
/**
* Kapselt eine Instanz von ratingallocate
*
* @author max
*
*/
class ratingallocate {
/** @var int */
private $ratingallocateid;
/** @var ratingallocate_db_wrapper */
public $ratingallocate;
/** @var stdClass original db_record of this instance */
private $origdbrecord;
/** @var stdClass */
private $course;
/** @var stdClass */
private $coursemodule;
/** @var context_module */
private $context;
/** @var $db moodle_database */
public $db; // Public because solvers need it, too.
/**
* @var mod_ratingallocate_renderer the custom renderer for this module
*/
protected $renderer;
const NOTIFY_SUCCESS = 'notifysuccess';
const NOTIFY_MESSAGE = 'notifymessage';
/**
* Returns all users enrolled in the course the ratingallocate is in
* @throws moodle_exception
*/
public function get_raters_in_course(): array {
$modinfo = get_fast_modinfo($this->course);
$cm = $modinfo->get_cm($this->coursemodule->id);
$raters = get_enrolled_users($this->context, 'mod/ratingallocate:give_rating');
$info = new info_module($cm);
// Only show raters who had the ability to access this activity. This funktion ignores the visibility setting,
// so the ratings and allocations are still shown, even when the activity is hidden.
$filteredraters = $info->filter_user_list($raters);
return $filteredraters;
}
/**
* Get candidate groups for restricting choices.
*
* @return array A mapping of group IDs to names.
*/
public function get_group_candidates() {
$options = array();
$groupcandidates = groups_get_all_groups($this->course->id);
foreach ($groupcandidates as $group) {
$options[$group->id] = $group->name;
}
return $options;
}
public function __construct($ratingallocaterecord, $course, $coursem, context_module $context) {
global $DB;
$this->db = &$DB;
$this->origdbrecord = $ratingallocaterecord;
$this->ratingallocate = new ratingallocate_db_wrapper($ratingallocaterecord);
$this->ratingallocateid = $this->ratingallocate->id;
$this->course = $course;
$this->coursemodule = $coursem;
$this->context = $context;
}
/**
* @return string
* @throws coding_exception
*/
private function process_action_start_distribution() {
global $CFG, $DB, $PAGE;
// Process form: Start distribution and call default page after finishing.
if (has_capability('mod/ratingallocate:start_distribution', $this->context)) {
if ($this->get_algorithm_status() === \mod_ratingallocate\algorithm_status::RUNNING) {
// Don't run, if an instance is already running.
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id)),
get_string('algorithm_already_running', RATINGALLOCATE_MOD_NAME),
null,
\core\output\notification::NOTIFY_INFO);
} else if ($this->ratingallocate->runalgorithmbycron === "1" &&
$this->get_algorithm_status() === \mod_ratingallocate\algorithm_status::NOTSTARTED
) {
// Don't run, if the cron has not started yet, but is set as priority.
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id)),
get_string('algorithm_scheduled_for_cron', RATINGALLOCATE_MOD_NAME),
null,
\core\output\notification::NOTIFY_INFO);
} else if ($CFG->ratingallocate_algorithm_force_background_execution === '1') {
// Force running algorithm by cron.
$this->ratingallocate->runalgorithmbycron = 1;
// Reset status to 'not started'.
$this->ratingallocate->algorithmstatus = \mod_ratingallocate\algorithm_status::NOTSTARTED;
$this->origdbrecord->{this_db\ratingallocate::RUNALGORITHMBYCRON} = '1';
$this->origdbrecord->{this_db\ratingallocate::ALGORITHMSTATUS} = \mod_ratingallocate\algorithm_status::NOTSTARTED;
// Clear eventually scheduled distribution of unallocated users.
$this->clear_distribute_unallocated_tasks();
// Clear all previous allocations so cron job picks up this task and calculates new allocation.
$this->clear_all_allocations();
$DB->update_record(this_db\ratingallocate::TABLE, $this->origdbrecord);
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id)),
get_string('algorithm_now_scheduled_for_cron', RATINGALLOCATE_MOD_NAME),
null,
\core\output\notification::NOTIFY_INFO);
} else {
$this->clear_distribute_unallocated_tasks();
$this->origdbrecord->{this_db\ratingallocate::ALGORITHMSTATUS} = \mod_ratingallocate\algorithm_status::RUNNING;
$DB->update_record(this_db\ratingallocate::TABLE, $this->origdbrecord);
// Try to get some more memory, 500 users in 10 groups take about 15mb.
raise_memory_limit(MEMORY_EXTRA);
core_php_time_limit::raise();
// Distribute choices.
$timeneeded = $this->distrubute_choices();
// Logging.
$event = \mod_ratingallocate\event\distribution_triggered::create_simple(
context_module::instance($this->coursemodule->id), $this->ratingallocateid, $timeneeded);
$event->trigger();
redirect(new moodle_url($PAGE->url->out()),
get_string('distribution_saved', RATINGALLOCATE_MOD_NAME, $timeneeded),
null,
\core\output\notification::NOTIFY_SUCCESS);
}
}
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id)));
return;
}
private function delete_all_student_ratings() {
global $USER;
// Disallow to delete ratings for students and tutors.
if (!has_capability('mod/ratingallocate:start_distribution', $this->context, null, false)) {
redirect(new moodle_url('/mod/ratingallocate/view.php', array('id' => $this->coursemodule->id)),
get_string('error_deleting_all_insufficient_permission', RATINGALLOCATE_MOD_NAME));
return;
}
// Disallow deletion when there can't be new ratings submitted.
$status = $this->get_status();
if ($status !== self::DISTRIBUTION_STATUS_RATING_IN_PROGRESS && $status !== self::DISTRIBUTION_STATUS_TOO_EARLY) {
redirect(new moodle_url('/mod/ratingallocate/view.php', array('id' => $this->coursemodule->id)),
get_string('error_deleting_all_no_rating_possible', RATINGALLOCATE_MOD_NAME));
return;
}
$this->delete_all_ratings();
redirect(new moodle_url('/mod/ratingallocate/view.php', array('id' => $this->coursemodule->id)),
get_string('success_deleting_all', RATINGALLOCATE_MOD_NAME));
}
private function process_action_give_rating() {
global $CFG;
$output = '';
$renderer = $this->get_renderer();
// Print data and controls for students, but not for admins.
if (has_capability('mod/ratingallocate:give_rating', $this->context, null, false)) {
global $DB, $PAGE, $USER;
$status = $this->get_status();
// If no choice option exists WARN!
if (!$DB->record_exists('ratingallocate_choices', array('ratingallocateid' => $this->ratingallocateid))) {
$renderer->add_notification(get_string('no_choice_to_rate', RATINGALLOCATE_MOD_NAME));
} else if ($status === self::DISTRIBUTION_STATUS_RATING_IN_PROGRESS) {
// Rating is possible...
// Suche das richtige Formular nach Strategie.
$strategyform = 'ratingallocate\\' . $this->ratingallocate->strategy . '\\mod_ratingallocate_view_form';
$mform = new $strategyform($PAGE->url->out(), $this);
$mform->add_action_buttons();
if ($mform->is_cancelled()) {
// Return to view.
redirect("$CFG->wwwroot/mod/ratingallocate/view.php?id=" . $this->coursemodule->id);
return "";
} else if ($mform->is_submitted() && $mform->is_validated() && $data = $mform->get_data()) {
// Save submitted data and call default page.
$this->save_ratings_to_db($USER->id, $data->data);
// Return to view.
redirect(
"$CFG->wwwroot/mod/ratingallocate/view.php?id=" . $this->coursemodule->id,
get_string('ratings_saved', RATINGALLOCATE_MOD_NAME),
null, \core\output\notification::NOTIFY_SUCCESS
);
}
$mform->definition_after_data();
$output .= $renderer->render_ratingallocate_strategyform($mform);
// Logging.
$event = \mod_ratingallocate\event\rating_viewed::create_simple(
context_module::instance($this->coursemodule->id), $this->ratingallocateid);
$event->trigger();
}
}
return $output;
}
/**
* Processes the action of a user deleting his rating.
*/
private function process_action_delete_rating() {
$renderer = $this->get_renderer();
// Print data and controls for students, but not for admins.
if (has_capability('mod/ratingallocate:give_rating', $this->context, null, false)) {
global $USER;
$status = $this->get_status();
if ($status === self::DISTRIBUTION_STATUS_RATING_IN_PROGRESS) {
// Rating is possible...
$this->delete_ratings_of_user($USER->id);
$renderer->add_notification(get_string('ratings_deleted', RATINGALLOCATE_MOD_NAME), self::NOTIFY_SUCCESS);
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id)),
get_string('ratings_deleted', RATINGALLOCATE_MOD_NAME),
null,
\core\output\notification::NOTIFY_SUCCESS);
}
}
redirect(new moodle_url('/mod/ratingallocate/view.php', array('id' => $this->coursemodule->id)));
}
private function process_action_show_choices() {
if (has_capability('mod/ratingallocate:modify_choices', $this->context)) {
global $OUTPUT;
$renderer = $this->get_renderer();
// Notifications if no choices exist or too few in comparison to strategy settings.
$availablechoices = $this->get_rateable_choices();
$strategysettings = $this->get_strategy_class()->get_static_settingfields();
if (array_key_exists(ratingallocate\strategy_order\strategy::COUNTOPTIONS, $strategysettings)) {
$necessarychoices =
$strategysettings[ratingallocate\strategy_order\strategy::COUNTOPTIONS][2];
} else {
$necessarychoices = 0;
}
if (count($availablechoices) < $necessarychoices) {
$renderer->add_notification(get_string('too_few_choices_to_rate', RATINGALLOCATE_MOD_NAME, $necessarychoices));
}
echo $renderer->render_header($this->ratingallocate, $this->context, $this->coursemodule->id);
echo $OUTPUT->heading(get_string('show_choices_header', RATINGALLOCATE_MOD_NAME));
$renderer->ratingallocate_show_choices_table($this, true);
echo $OUTPUT->single_button(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id)), get_string('back'), 'get');
echo $renderer->render_footer();
}
}
private function process_action_edit_choice() {
global $DB, $PAGE;
$output = '';
if (has_capability('mod/ratingallocate:modify_choices', $this->context)) {
global $OUTPUT;
$choiceid = optional_param('choiceid', 0, PARAM_INT);
if ($choiceid) {
$record = $DB->get_record(this_db\ratingallocate_choices::TABLE, array('id' => $choiceid));
$choice = new ratingallocate_choice($record);
} else {
$choice = null;
}
$data = new stdClass();
$options = array('subdirs' => false, 'maxfiles' => -1, 'accepted_types' => '*', 'return_types' => FILE_INTERNAL);
file_prepare_standard_filemanager($data, 'attachments', $options, $this->context,
'mod_ratingallocate', 'choice_attachment', $choiceid);
$mform = new modify_choice_form(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id,
'ratingallocateid' => $this->ratingallocateid,
'action' => ACTION_EDIT_CHOICE,
)),
$this, $choice, array('attachment_data' => $data));
$renderer = $this->get_renderer();
if ($mform->is_submitted() && $data = $mform->get_submitted_data()) {
if (!$mform->is_cancelled()) {
if ($mform->is_validated()) {
// Processing for editor element (FORMAT_HTML is assumed).
// Note: No file management implemented at this point.
if (is_array($data->explanation)) {
$data->explanation = $data->explanation['text'];
}
$this->save_modify_choice_form($data);
$data = file_postupdate_standard_filemanager($data, 'attachments', $options, $this->context,
'mod_ratingallocate', 'choice_attachment', $data->choiceid);
$renderer->add_notification(get_string("choice_added_notification", RATINGALLOCATE_MOD_NAME),
self::NOTIFY_SUCCESS);
if ($data->usegroups) {
$this->update_choice_groups($data->choiceid, $data->groupselector);
}
} else {
$output .= $OUTPUT->heading(get_string('edit_choice', RATINGALLOCATE_MOD_NAME), 2);
$output .= $mform->to_html();
return $output;
}
}
if (object_property_exists($data, 'submitbutton2')) {
// If form was submitted using submit2, redirect to the empty edit choice form.
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id,
'ratingallocateid' => $this->ratingallocateid,
'action' => ACTION_EDIT_CHOICE, 'next' => true)));
} else {
// If form was submitted using save or cancel, redirect to the choices table.
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id, 'action' => ACTION_SHOW_CHOICES)));
}
} else {
$isnext = optional_param('next', false, PARAM_BOOL);
if ($isnext) {
$renderer->add_notification(get_string("choice_added_notification", RATINGALLOCATE_MOD_NAME),
self::NOTIFY_SUCCESS);
}
$output .= $OUTPUT->heading(get_string('edit_choice', RATINGALLOCATE_MOD_NAME), 2);
$output .= $mform->to_html();
}
}
return $output;
}
/**
* Upload one or more choices via a CSV file.
*/
private function process_action_upload_choices() {
global $DB, $PAGE;
$output = '';
if (has_capability('mod/ratingallocate:modify_choices', $this->context)) {
global $OUTPUT;
$url = new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id,
'ratingallocateid' => $this->ratingallocateid,
'action' => ACTION_UPLOAD_CHOICES,
)
);
$mform = new upload_choices_form($url, $this);
$renderer = $this->get_renderer();
if ($mform->is_submitted() && $data = $mform->get_submitted_data()) {
if (!$mform->is_cancelled()) {
if ($mform->is_validated()) {
$content = $mform->get_file_content('uploadfile');
$name = $mform->get_new_filename('uploadfile');
$live = !$data->testimport; // If testing, importer is not live.
// Properly process the file content.
$choiceimporter = new \mod_ratingallocate\choice_importer($this->ratingallocateid, $this);
$importstatus = $choiceimporter->import($content, $live);
switch ($importstatus->status) {
case \mod_ratingallocate\choice_importer::IMPORT_STATUS_OK:
\core\notification::info($importstatus->status_message);
break;
case \mod_ratingallocate\choice_importer::IMPORT_STATUS_DATA_ERROR:
\core\notification::warning($importstatus->status_message);
$choiceimporter->issue_notifications($importstatus->errors);
break;
case \mod_ratingallocate\choice_importer::IMPORT_STATUS_SETUP_ERROR:
default:
\core\notification::error($importstatus->status_message);
$choiceimporter->issue_notifications($importstatus->errors,
\core\output\notification::NOTIFY_ERROR);
}
redirect(new moodle_url('/mod/ratingallocate/view.php',
array(
'id' => $this->coursemodule->id,
'action' => ACTION_SHOW_CHOICES
)));
}
}
}
$output .= $OUTPUT->heading(get_string('upload_choices', 'ratingallocate'), 2);
$output .= $mform->to_html();
}
return $output;
}
/**
* Enables or disables a choice and displays the choices list.
* @param bool $active states if the choice should be set active or inavtive
*/
private function process_action_enable_choice($active) {
if (has_capability('mod/ratingallocate:modify_choices', $this->context)) {
global $DB;
$choiceid = optional_param('choiceid', 0, PARAM_INT);
if ($choiceid) {
$DB->set_field(this_db\ratingallocate_choices::TABLE,
this_db\ratingallocate_choices::ACTIVE,
$active,
array('id' => $choiceid));
}
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id, 'action' => ACTION_SHOW_CHOICES)));
}
}
/**
* Deletes a choice and displays the choices list.
*/
private function process_action_delete_choice() {
if (has_capability('mod/ratingallocate:modify_choices', $this->context)) {
global $DB;
$choiceid = optional_param('choiceid', 0, PARAM_INT);
if ($choiceid) {
$choice = $DB->get_record(this_db\ratingallocate_choices::TABLE, array('id' => $choiceid));
if ($choice) {
// Delete related group associations, if any.
$DB->delete_records(this_db\ratingallocate_group_choices::TABLE, ['choiceid' => $choiceid]);
$DB->delete_records(this_db\ratingallocate_ch_gengroups::TABLE, ['choiceid' => $choiceid]);
$DB->delete_records(this_db\ratingallocate_choices::TABLE, array('id' => $choiceid));
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id, 'action' => ACTION_SHOW_CHOICES)),
get_string('choice_deleted_notification', RATINGALLOCATE_MOD_NAME,
$choice->{this_db\ratingallocate_choices::TITLE}),
null,
\core\output\notification::NOTIFY_SUCCESS);
} else {
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id, 'action' => ACTION_SHOW_CHOICES)),
get_string('choice_deleted_notification_error', RATINGALLOCATE_MOD_NAME),
null,
\core\output\notification::NOTIFY_ERROR);
}
}
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id, 'action' => ACTION_SHOW_CHOICES)));
}
}
private function process_action_manual_allocation() {
// Manual allocation.
$output = '';
if (has_capability('mod/ratingallocate:start_distribution', $this->context)) {
global $OUTPUT, $PAGE;
$mform = new manual_alloc_form($PAGE->url, $this);
$notification = '';
$notificationtype = null;
if (!$mform->no_submit_button_pressed() && $data = $mform->get_submitted_data()) {
if (!$mform->is_cancelled()) {
$renderer = $this->get_renderer();
$status = $this->get_status();
if ($status === self::DISTRIBUTION_STATUS_TOO_EARLY ||
$status === self::DISTRIBUTION_STATUS_RATING_IN_PROGRESS) {
$notification = get_string('modify_allocation_group_desc_' . $status, RATINGALLOCATE_MOD_NAME);
$notificationtype = \core\output\notification::NOTIFY_WARNING;
} else {
$allocationdata = optional_param_array('allocdata', array(), PARAM_INT);
if ($userdata = optional_param_array('userdata', null, PARAM_INT)) {
$this->save_manual_allocation_form($allocationdata, $userdata);
$notification = get_string('manual_allocation_saved', RATINGALLOCATE_MOD_NAME);
$notificationtype = \core\output\notification::NOTIFY_SUCCESS;
} else {
$notification = get_string('manual_allocation_nothing_to_be_saved', RATINGALLOCATE_MOD_NAME);
$notificationtype = \core\output\notification::NOTIFY_INFO;
}
}
} else {
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id)));
}
// If form was submitted using save or cancel, retirect to the default page.
if (property_exists($data, "submitbutton")) {
if ($notification) {
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id)), $notification, null, $notificationtype);
} else {
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id)));
}
// If the save and continue button was pressed,
// redirect to the manual allocation form to refresh the checked radiobuttons.
} else if (property_exists($data, "submitbutton2")) {
if ($notification) {
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id, 'action' => ACTION_MANUAL_ALLOCATION)), $notification, null,
$notificationtype);
} else {
redirect(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id, 'action' => ACTION_MANUAL_ALLOCATION)));
}
}
}
$output .= $OUTPUT->heading(get_string('manual_allocation', RATINGALLOCATE_MOD_NAME), 2);
$output .= $mform->to_html();
$this->showinfo = false;
}
return $output;
}
/**
* Retrieve all used groups in rateable choices.
*
* @return array of group ids used in rateable choices
*/
public function get_all_groups_of_choices(): array {
$rateablechoiceswithgrouprestrictions = array_filter($this->get_rateable_choices(),
fn($choice) => !empty($choice->usegroups) && !empty($this->get_choice_groups($choice->id)));
$rateablechoiceids = array_map(fn($choice) => $choice->id, $rateablechoiceswithgrouprestrictions);
$groupids = [];
foreach ($rateablechoiceids as $choiceid) {
$groupids = array_merge($groupids, array_map(fn($group) => $group->id, $this->get_choice_groups($choiceid)));
}
return array_unique($groupids);
}
/**
* Helper method returning an array of groupids belonging to the groups the user is member in.
*
* If the user is not a member of any group an empty array is being returned. Only group ids of groups defined in the
* choices restrictions are being considered here.
*
* @param int $userid the id of the user we want to get the group ids he/she belongs to
* @return array of group ids the user belongs to, not including groups which are not specified in at least one of the choices'
* group restrictions
*/
public function get_user_groupids(int $userid): array {
$groups = groups_get_user_groups($this->ratingallocate->course, $userid)[0];
if (empty($groups)) {
return [];
} else {
return array_filter($groups, fn($group) => in_array($group, $this->get_all_groups_of_choices()));
}
}
/**
* Helper function to retrieve undistributed users.
*
* This function returns an associative array [groupcount => [ users ]], groupcount meaning the amount of groups (used in
* ratingallocate choices) the users are member of.
*
* @return array Associative array [groupcount => [ users ]]
*/
private function get_undistributed_users_with_groupscount(): array {
$cachedallocations = $this->get_allocations();
$raters = $this->get_raters_in_course();
$undistributedusers = array_map(fn($user) => $user->id, array_values(array_filter($raters,
fn($user) => !in_array($user->id, array_keys($cachedallocations)))));
$undistributeduserswithgroups = [];
foreach ($undistributedusers as $user) {
$undistributeduserswithgroups[count($this->get_user_groupids($user))][] = $user;
}
return $undistributeduserswithgroups;
}
/**
* Returns an array of all userids of users which do not have an allocation (yet).
*
* This array will be sorted: Users with fewer memberships in groups used in the choices will come first. Exception:
* Users without group membership (groups count 0) are at the end of the array.
*
* @return array Array of user ids not having an allocation
*/
public function get_undistributed_users(): array {
$undistributedusers = [];
$userswithgroups = $this->get_undistributed_users_with_groupscount();
if (empty($userswithgroups)) {
return [];
}
for ($i = 1; $i <= max(array_keys($userswithgroups)); $i++) {
if (empty($userswithgroups[$i])) {
continue;
}
$undistributedusers = array_merge($undistributedusers, $userswithgroups[$i]);
}
if (!empty($userswithgroups[0])) {
$undistributedusers = array_merge($undistributedusers, $userswithgroups[0]);
}
return $undistributedusers;
}
/**
* Function to retrieve the next choice which an undistributed user should be assigned to.
*
* @param string $distributionalgorithm the algorithm which should be applied to search for the next choice
* @param int $userid the userid of the user for which the next choice should be retrieved
* @return int id of the choice the given user should be assigned to, returns -1 if no valid choice
* for the user could be found, returns -2 if there are no places left to assign any user
* @throws dml_exception
*/
public function get_next_choice_to_assign_user(string $distributionalgorithm, int $userid): int {
global $DB;
$placesleft = [];
// Due to performance reasons we need to save some database query results to avoid multiple inefficient queries.
$cachedusergroupids = $this->get_user_groupids($userid);
$cachedundistributedusers = $this->get_undistributed_users();
$cachedallocations = $this->get_allocations();
$cachedchoices = [];
foreach ($this->get_rateable_choices() as $choice) {
$cachedchoices[$choice->id] = $choice;
$placesleft[$choice->id] = $choice->maxsize -
count(array_filter($cachedallocations, fn($allocation) => $allocation->choiceid == $choice->id));
}
// We have to remove the choices which are already maxed out.
$placesleft = array_filter($placesleft, fn($numberoffreeplaces) => $numberoffreeplaces != 0);
// Early exit if there are no choices with places left. We return -2 to signal the calling function that
// *independently* from the userid (we have not calculated anything userid specific until here) there are no
// choices with free places left.
if (empty($placesleft)) {
return -2;
}
// Filter choices the user cannot be assigned to.
foreach (array_keys($placesleft) as $choiceid) {
$choice = $DB->get_record('ratingallocate_choices', ['id' => $choiceid]);
if (empty($choice->usegroups)) {
// If we have a group without group restrictions it will always be available.
continue;
}
$choicegroups = $this->get_choice_groups($choiceid);
if (empty($choicegroups)) {
// If we have a group with group restrictions enabled, but without groups defined, no user
// can ever be assigned, so remove it.
unset($placesleft[$choiceid]);
continue;
}
// So only choices with 'proper' group restrictions are left now.
$groupidsofcurrentchoice = array_map(fn($group) => $group->id, $choicegroups);
$intersectinggroupids = array_intersect($cachedusergroupids, $groupidsofcurrentchoice);
if (empty($intersectinggroupids)) {
// If the user is not in one of the groups of the current choice, we remove the choice from possibles choices.
unset($placesleft[$choiceid]);
}
}
// At this point $placesleft only contains choices the user can be assigned to.
if (empty($placesleft)) {
// If we have no choice to assign, we return -1 to signal the algorithm that we cannot assign the user.
return -1;
}
// We now have to decide which choice id will be returned as the one the user will be assigned to.
// In case of "equal distribution" we have to fake the amount of available places first.
if ($distributionalgorithm == ACTION_DISTRIBUTE_UNALLOCATED_EQUALLY) {
$userstodistributecount = count($cachedundistributedusers);
$freeplacescount = array_reduce($placesleft, fn($a, $b) => $a + $b);
$freeplacesoverhang = $freeplacescount - $userstodistributecount;
if ($freeplacesoverhang > 0) {
// Only if there are more free places than users to distribute, we want to distribute "equally".
// Choices with more places left should be targeted first when reducing places left.
arsort($placesleft);
$i = 0;
$choicesmaxed = [];
// We now lower each count of available places in each choice for every additional place that we have altogether
// than users to still distribute.
while ($freeplacesoverhang > 0 && count(array_unique($choicesmaxed)) < count($placesleft)) {
// Second condition means that we will stop if we failed trying to reduce *every* choice.
$nextchoiceid = array_keys($placesleft)[$i];
if ($placesleft[$nextchoiceid] > 0) {
// If we can still lower it, we do it.
$placesleft[$nextchoiceid] = $placesleft[$nextchoiceid] - 1;
$freeplacesoverhang--;
} else {
// If we cannot lower the places left anymore for this choice, we track that and will try to lower the
// available places for the next one instead.
$choicesmaxed[] = $nextchoiceid;
}
$i++;
// We are iterating over all the choices constantly and try to reduce the available places.
$i = $i % count($placesleft);
}
// We recalculated the left places for each choice, so we have to remove the choices which are now maxed out.
$placesleft = array_filter($placesleft, fn($numberoffreeplaces) => $numberoffreeplaces != 0);
}
}
// From here on it's just the algorithm 'distribute by filling up'.
$possiblechoices = $placesleft;
$choicessortedwithgroupscount = [];
$choicessorted = [];
foreach (array_keys($possiblechoices) as $choiceid) {
$choice = $DB->get_record('ratingallocate_choices', ['id' => $choiceid]);
// In case group restrictions are disabled for a choice that choice could still could have groups assigned.
// However, we need to treat them like they do not have any groups.
$groupscount = empty($choice->usegroups) ? 0 : count($this->get_choice_groups($choiceid));
$choicessortedwithgroupscount[$groupscount][] = $choiceid;
}
foreach ($choicessortedwithgroupscount as &$choiceswithcertaingroupcount) {
usort($choiceswithcertaingroupcount, function($a, $b) use ($placesleft) {
// Choices with the same amount of groups are sorted according the count of left places: fewer places first.
return $placesleft[$a] - $placesleft[$b];
});
}
for ($i = 1; $i <= max(array_keys($choicessortedwithgroupscount)); $i++) {
if (empty($choicessortedwithgroupscount[$i])) {
continue;
}
$choicessorted = array_merge($choicessorted, $choicessortedwithgroupscount[$i]);
}
if (!empty($choicessortedwithgroupscount[0])) {
$choicessorted = array_merge($choicessorted, $choicessortedwithgroupscount[0]);
}
// This is kind of a dilemma. We want the choices to be filled up beginning at the one with the least places left to fill it
// up as quickly as possible.
// However, in case of group restrictions this will lead to problems as we are assigning users which have to be assigned to
// specific choices (because all others cannot be assigned to it). So in the end these choices will not be available when
// we arrive at the choice with the group restrictions.
// Therefore, we are first filling up choices with group restrictions first (beginning at choices with fewer groups). Only
// in case we have the same amount of groups for two choices or we have no group restrictions at all we pick choices with
// fewer places left first (see foreach loop with usort a few lines above).
return !empty($choicessorted) ? array_shift($choicessorted) : -1;
}
/**
* Wrapper function to queue an adhoc task for distributing unallocated users.
*
* @param string $distributionalgorithm one of the string constants ACTION_DISTRIBUTE_UNALLOCATED_FILL or ACTION_DISTRIBUTE_UNALLOCATED_EQUALLY
* @return void
*/
public function queue_distribution_of_users_without_choice(string $distributionalgorithm): void {
global $USER;
$task = new distribute_unallocated_task();
$data = new stdClass();
$data->courseid = $this->course->id;
$data->cmid = $this->coursemodule->id;
$data->distributionalgorithm = $distributionalgorithm;
$task->set_custom_data($data);
$task->set_userid($USER->id);
\core\task\manager::queue_adhoc_task($task, true);
}
/**
* Try to distribute all currently unallocated users.
*
* @param string $distributionalgorithm the distributionalgorithm which should be used, you can choose between
* ACTION_DISTRIBUTE_UNALLOCATED_EQUALLY and ACTION_DISTRIBUTE_UNALLOCATED_FILL
* @return void
* @throws dml_exception
*/
public function distribute_users_without_choice(string $distributionalgorithm): void {
// This could need some extra memory, especially because we are caching some data structures in memory while
// running the algorithm.
raise_memory_limit(MEMORY_EXTRA);
core_php_time_limit::raise();
// This will retrieve a list of users we are trying to assign to choices, sorted from the least group membership count to
// more group memberships. Users without group memberships will be at the end of the array.
$possibleusers = $this->get_undistributed_users();
$transaction = $this->db->start_delegated_transaction();
$usertoassign = array_shift($possibleusers);
// As long as we have a user to assign, we try to assign him.
while ($usertoassign != null) {
// Calculate the choice to assign the user to depending on the given algorithm.
$choicetoassign = $this->get_next_choice_to_assign_user($distributionalgorithm, $usertoassign);
if ($choicetoassign === -2) {
// This means there are no free places left in any choice for any user, so we can stop the algorithm
// as a whole.
break;
} else if ($choicetoassign == -1) {
// This means that the user could not be assigned (for example due to group restrictions),
// so we try the next one.
$usertoassign = array_shift($possibleusers);
continue;
}
$this->add_allocation($choicetoassign, $usertoassign);
$usertoassign = array_shift($possibleusers);
}
// At this point we tried to assign all the users. It is possible that users remain undistributed, though.
$transaction->allow_commit();
}
private function process_action_show_ratings_and_alloc_table() {
$output = '';
// Print ratings table.
if (has_capability('mod/ratingallocate:start_distribution', $this->context)) {
global $OUTPUT;
$renderer = $this->get_renderer();
$output .= $renderer->ratings_table_for_ratingallocate($this->get_rateable_choices(),
$this->get_ratings_for_rateable_choices(), $this->get_raters_in_course(),
$this->get_allocations(), $this);
$output = html_writer::div($output, 'ratingallocate_ratings_table_container');
$output .= html_writer::empty_tag('br', array());
$output .= $OUTPUT->single_button(new moodle_url('/mod/ratingallocate/view.php', array(
'id' => $this->coursemodule->id)), get_string('back'), 'get');
// Logging.
$event = \mod_ratingallocate\event\ratings_and_allocation_table_viewed::create_simple(
context_module::instance($this->coursemodule->id), $this->ratingallocateid);
$event->trigger();
}
return $output;
}
private function process_action_show_allocation_table() {
$output = '';
// Print ratings table.
if (has_capability('mod/ratingallocate:start_distribution', $this->context)) {
global $OUTPUT;
$renderer = $this->get_renderer();
$output .= $renderer->allocation_table_for_ratingallocate($this);
$output .= html_writer::empty_tag('br', array());
$output .= $OUTPUT->single_button(new moodle_url('/mod/ratingallocate/view.php',
array('id' => $this->coursemodule->id)), get_string('back'), 'get');
// Logging.
$event = \mod_ratingallocate\event\allocation_table_viewed::create_simple(