Proyectos de Subversion Moodle

<?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/>.

/**

 * This file contains the definition for the class assignment

 *

 * This class provides all the functionality for the new assign module.

 *

 * @package   mod_assign

 * @copyright 2012 NetSpot {@link http://www.netspot.com.au}

 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

defined('MOODLE_INTERNAL') || die();

// Assignment submission statuses.

define('ASSIGN_SUBMISSION_STATUS_NEW', 'new');

define('ASSIGN_SUBMISSION_STATUS_REOPENED', 'reopened');

define('ASSIGN_SUBMISSION_STATUS_DRAFT', 'draft');

define('ASSIGN_SUBMISSION_STATUS_SUBMITTED', 'submitted');

// Search filters for grading page.

define('ASSIGN_FILTER_NONE', 'none');

define('ASSIGN_FILTER_SUBMITTED', 'submitted');

define('ASSIGN_FILTER_NOT_SUBMITTED', 'notsubmitted');

define('ASSIGN_FILTER_SINGLE_USER', 'singleuser');

define('ASSIGN_FILTER_REQUIRE_GRADING', 'requiregrading');

define('ASSIGN_FILTER_GRANTED_EXTENSION', 'grantedextension');

define('ASSIGN_FILTER_DRAFT', 'draft');

// Marker filter for grading page.

define('ASSIGN_MARKER_FILTER_NO_MARKER', -1);

// Reopen attempt methods.

define('ASSIGN_ATTEMPT_REOPEN_METHOD_NONE', 'none');

define('ASSIGN_ATTEMPT_REOPEN_METHOD_MANUAL', 'manual');

define('ASSIGN_ATTEMPT_REOPEN_METHOD_UNTILPASS', 'untilpass');

// Special value means allow unlimited attempts.

define('ASSIGN_UNLIMITED_ATTEMPTS', -1);

// Special value means no grade has been set.

define('ASSIGN_GRADE_NOT_SET', -1);

// Grading states.

define('ASSIGN_GRADING_STATUS_GRADED', 'graded');

define('ASSIGN_GRADING_STATUS_NOT_GRADED', 'notgraded');

// Marking workflow states.

define('ASSIGN_MARKING_WORKFLOW_STATE_NOTMARKED', 'notmarked');

define('ASSIGN_MARKING_WORKFLOW_STATE_INMARKING', 'inmarking');

define('ASSIGN_MARKING_WORKFLOW_STATE_READYFORREVIEW', 'readyforreview');

define('ASSIGN_MARKING_WORKFLOW_STATE_INREVIEW', 'inreview');

define('ASSIGN_MARKING_WORKFLOW_STATE_READYFORRELEASE', 'readyforrelease');

define('ASSIGN_MARKING_WORKFLOW_STATE_RELEASED', 'released');

/** ASSIGN_MAX_EVENT_LENGTH = 432000 ; 5 days maximum */

define("ASSIGN_MAX_EVENT_LENGTH", "432000");

// Name of file area for intro attachments.

define('ASSIGN_INTROATTACHMENT_FILEAREA', 'introattachment');

// Name of file area for activity attachments.

define('ASSIGN_ACTIVITYATTACHMENT_FILEAREA', 'activityattachment');

// Event types.

define('ASSIGN_EVENT_TYPE_DUE', 'due');

define('ASSIGN_EVENT_TYPE_GRADINGDUE', 'gradingdue');

define('ASSIGN_EVENT_TYPE_OPEN', 'open');

define('ASSIGN_EVENT_TYPE_CLOSE', 'close');

require_once($CFG->libdir . '/accesslib.php');

require_once($CFG->libdir . '/formslib.php');

require_once($CFG->dirroot . '/repository/lib.php');

require_once($CFG->dirroot . '/mod/assign/mod_form.php');

require_once($CFG->libdir . '/gradelib.php');

require_once($CFG->dirroot . '/grade/grading/lib.php');

require_once($CFG->dirroot . '/mod/assign/feedbackplugin.php');

require_once($CFG->dirroot . '/mod/assign/submissionplugin.php');

require_once($CFG->dirroot . '/mod/assign/renderable.php');

require_once($CFG->dirroot . '/mod/assign/gradingtable.php');

require_once($CFG->libdir . '/portfolio/caller.php');

use mod_assign\event\submission_removed;

use mod_assign\event\submission_status_updated;

use \mod_assign\output\grading_app;

use \mod_assign\output\assign_header;

use \mod_assign\output\assign_submission_status;

use mod_assign\output\timelimit_panel;

use mod_assign\downloader;

/**

 * Standard base class for mod_assign (assignment types).

 *

 * @package   mod_assign

 * @copyright 2012 NetSpot {@link http://www.netspot.com.au}

 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class assign

{

    /** @var stdClass the assignment record that contains the global settings for this assign instance */

    private $instance;

    /** @var array $var array an array containing per-user assignment records, each having calculated properties (e.g. dates) */

    private $userinstances = [];

    /** @var grade_item the grade_item record for this assign instance's primary grade item. */

    private $gradeitem;

    /** @var context the context of the course module for this assign instance

     *               (or just the course if we are creating a new one)

     */

    private $context;

    /** @var stdClass the course this assign instance belongs to */

    private $course;

    /** @var stdClass the admin config for all assign instances  */

    private $adminconfig;

    /** @var assign_renderer the custom renderer for this module */

    private $output;

    /** @var cm_info the course module for this assign instance */

    private $coursemodule;

    /** @var array cache for things like the coursemodule name or the scale menu -

     *             only lives for a single request.

     */

    private $cache;

    /** @var array list of the installed submission plugins */

    private $submissionplugins;

    /** @var array list of the installed feedback plugins */

    private $feedbackplugins;

    /** @var string action to be used to return to this page

     *              (without repeating any form submissions etc).

     */

    private $returnaction = 'view';

    /** @var array params to be used to return to this page */

    private $returnparams = array();

    /** @var string modulename prevents excessive calls to get_string */

    private static $modulename = null;

    /** @var string modulenameplural prevents excessive calls to get_string */

    private static $modulenameplural = null;

    /** @var array of marking workflow states for the current user */

    private $markingworkflowstates = null;

    /** @var array of all marking workflow states */

    private $allmarkingworkflowstates = null;

    /** @var bool whether to exclude users with inactive enrolment */

    private $showonlyactiveenrol = null;

    /** @var string A key used to identify userlists created by this object. */

    private $useridlistid = null;

    /** @var array cached list of participants for this assignment. The cache key will be group, showactive and the context id */

    private $participants = array();

    /** @var array cached list of user groups when team submissions are enabled. The cache key will be the user. */

    private $usersubmissiongroups = array();

    /** @var array cached list of user groups. The cache key will be the user. */

    private $usergroups = array();

    /** @var array cached list of IDs of users who share group membership with the user. The cache key will be the user. */

    private $sharedgroupmembers = array();

    /**

     * @var stdClass The most recent team submission. Used to determine additional attempt numbers and whether

     * to update the gradebook.

     */

    private $mostrecentteamsubmission = null;

    /** @var array Array of error messages encountered during the execution of assignment related operations. */

    private $errors = array();

    /** @var mixed This var can vary between false for no overrides to a stdClass of the overrides for a group */

    private $overridedata;

    /** @var float grade value. */

    public $grade;

    /**

     * Constructor for the base assign class.

     *

     * Note: For $coursemodule you can supply a stdclass if you like, but it

     * will be more efficient to supply a cm_info object.

     *

     * @param mixed $coursemodulecontext context|null the course module context

     *                                   (or the course context if the coursemodule has not been

     *                                   created yet).

     * @param mixed $coursemodule the current course module if it was already loaded,

     *                            otherwise this class will load one from the context as required.

     * @param mixed $course the current course  if it was already loaded,

     *                      otherwise this class will load one from the context as required.

     */

    public function __construct($coursemodulecontext, $coursemodule, $course)

    {

        $this->context = $coursemodulecontext;

        $this->course = $course;

        // Ensure that $this->coursemodule is a cm_info object (or null).

        $this->coursemodule = cm_info::create($coursemodule);

        // Temporary cache only lives for a single request - used to reduce db lookups.

        $this->cache = array();

        $this->submissionplugins = $this->load_plugins('assignsubmission');

        $this->feedbackplugins = $this->load_plugins('assignfeedback');

        // Extra entropy is required for uniqid() to work on cygwin.

        $this->useridlistid = clean_param(uniqid('', true), PARAM_ALPHANUM);

    }

    /**

     * Set the action and parameters that can be used to return to the current page.

     *

     * @param string $action The action for the current page

     * @param array $params An array of name value pairs which form the parameters

     *                      to return to the current page.

     * @return void

     */

    public function register_return_link($action, $params)

    {

        global $PAGE;

        $params['action'] = $action;

        $cm = $this->get_course_module();

        if ($cm) {

            $currenturl = new moodle_url('/mod/assign/view.php', array('id' => $cm->id));

        } else {

            $currenturl = new moodle_url('/mod/assign/index.php', array('id' => $this->get_course()->id));

        }

        $currenturl->params($params);

        $PAGE->set_url($currenturl);

    }

    /**

     * Return an action that can be used to get back to the current page.

     *

     * @return string action

     */

    public function get_return_action()

    {

        global $PAGE;

        // Web services don't set a URL, we should avoid debugging when ussing the url object.

        if (!WS_SERVER) {

            $params = $PAGE->url->params();

        }

        if (!empty($params['action'])) {

            return $params['action'];

        }

        return '';

    }

    /**

     * Based on the current assignment settings should we display the intro.

     *

     * @return bool showintro

     */

    public function show_intro()

    {

        if (

            $this->get_instance()->alwaysshowdescription ||

            time() > $this->get_instance()->allowsubmissionsfromdate

        ) {

            return true;

        }

        return false;

    }

    /**

     * Return a list of parameters that can be used to get back to the current page.

     *

     * @return array params

     */

    public function get_return_params()

    {

        global $PAGE;

        $params = array();

        if (!WS_SERVER) {

            $params = $PAGE->url->params();

        }

        unset($params['id']);

        unset($params['action']);

        return $params;

    }

    /**

     * Set the submitted form data.

     *

     * @param stdClass $data The form data (instance)

     */

    public function set_instance(stdClass $data)

    {

        $this->instance = $data;

    }

    /**

     * Set the context.

     *

     * @param context $context The new context

     */

    public function set_context(context $context)

    {

        $this->context = $context;

    }

    /**

     * Set the course data.

     *

     * @param stdClass $course The course data

     */

    public function set_course(stdClass $course)

    {

        $this->course = $course;

    }

    /**

     * Set error message.

     *

     * @param string $message The error message

     */

    protected function set_error_message(string $message)

    {

        $this->errors[] = $message;

    }

    /**

     * Get error messages.

     *

     * @return array The array of error messages

     */

    protected function get_error_messages(): array

    {

        return $this->errors;

    }

    /**

     * Get list of feedback plugins installed.

     *

     * @return array

     */

    public function get_feedback_plugins()

    {

        return $this->feedbackplugins;

    }

    /**

     * Get list of submission plugins installed.

     *

     * @return array

     */

    public function get_submission_plugins()

    {

        return $this->submissionplugins;

    }

    /**

     * Is blind marking enabled and reveal identities not set yet?

     *

     * @return bool

     */

    public function is_blind_marking()

    {

        return $this->get_instance()->blindmarking && !$this->get_instance()->revealidentities;

    }

    /**

     * Is hidden grading enabled?

     *

     * This just checks the assignment settings. Remember to check

     * the user has the 'showhiddengrader' capability too

     *

     * @return bool

     */

    public function is_hidden_grader()

    {

        return $this->get_instance()->hidegrader;

    }

    /**

     * Does an assignment have submission(s) or grade(s) already?

     *

     * @return bool

     */

    public function has_submissions_or_grades()

    {

        $allgrades = $this->count_grades();

        $allsubmissions = $this->count_submissions();

        if (($allgrades == 0) && ($allsubmissions == 0)) {

            return false;

        }

        return true;

    }

    /**

     * Get a specific submission plugin by its type.

     *

     * @param string $subtype assignsubmission | assignfeedback

     * @param string $type

     * @return mixed assign_plugin|null

     */

    public function get_plugin_by_type($subtype, $type)

    {

        $shortsubtype = substr($subtype, strlen('assign'));

        $name = $shortsubtype . 'plugins';

        if ($name != 'feedbackplugins' && $name != 'submissionplugins') {

            return null;

        }

        $pluginlist = $this->$name;

        foreach ($pluginlist as $plugin) {

            if ($plugin->get_type() == $type) {

                return $plugin;

            }

        }

        return null;

    }

    /**

     * Get a feedback plugin by type.

     *

     * @param string $type - The type of plugin e.g comments

     * @return mixed assign_feedback_plugin|null

     */

    public function get_feedback_plugin_by_type($type)

    {

        return $this->get_plugin_by_type('assignfeedback', $type);

    }

    /**

     * Get a submission plugin by type.

     *

     * @param string $type - The type of plugin e.g comments

     * @return mixed assign_submission_plugin|null

     */

    public function get_submission_plugin_by_type($type)

    {

        return $this->get_plugin_by_type('assignsubmission', $type);

    }

    /**

     * Load the plugins from the sub folders under subtype.

     *

     * @param string $subtype - either submission or feedback

     * @return array - The sorted list of plugins

     */

    public function load_plugins($subtype)

    {

        global $CFG;

        $result = array();

        $names = core_component::get_plugin_list($subtype);

        foreach ($names as $name => $path) {

            if (file_exists($path . '/locallib.php')) {

                require_once($path . '/locallib.php');

                $shortsubtype = substr($subtype, strlen('assign'));

                $pluginclass = 'assign_' . $shortsubtype . '_' . $name;

                $plugin = new $pluginclass($this, $name);

                if ($plugin instanceof assign_plugin) {

                    $idx = $plugin->get_sort_order();

                    while (array_key_exists($idx, $result)) {

                        $idx += 1;

                    }

                    $result[$idx] = $plugin;

                }

            }

        }

        ksort($result);

        return $result;

    }

    /**

     * Display the assignment, used by view.php

     *

     * The assignment is displayed differently depending on your role,

     * the settings for the assignment and the status of the assignment.

     *

     * @param string $action The current action if any.

     * @param array $args Optional arguments to pass to the view (instead of getting them from GET and POST).

     * @return string - The page output.

     */

    public function view($action = '', $args = array())

    {

        global $PAGE;

        $o = '';

        $mform = null;

        $notices = array();

        $nextpageparams = array();

        if (!empty($this->get_course_module()->id)) {

            $nextpageparams['id'] = $this->get_course_module()->id;

        }

        if (empty($action)) {

            $PAGE->add_body_class('limitedwidth');

        }

        // Handle form submissions first.

        if ($action == 'savesubmission') {

            $action = 'editsubmission';

            if ($this->process_save_submission($mform, $notices)) {

                $action = 'redirect';

                if ($this->can_grade()) {

                    $nextpageparams['action'] = 'grading';

                } else {

                    $nextpageparams['action'] = 'view';

                }

            }

        } else if ($action == 'editprevioussubmission') {

            $action = 'editsubmission';

            if ($this->process_copy_previous_attempt($notices)) {

                $action = 'redirect';

                $nextpageparams['action'] = 'editsubmission';

            }

        } else if ($action == 'lock') {

            $this->process_lock_submission();

            $action = 'redirect';

            $nextpageparams['action'] = 'grading';

        } else if ($action == 'removesubmission') {

            $this->process_remove_submission();

            $action = 'redirect';

            if ($this->can_grade()) {

                $nextpageparams['action'] = 'grading';

            } else {

                $nextpageparams['action'] = 'view';

            }

        } else if ($action == 'addattempt') {

            $this->process_add_attempt(required_param('userid', PARAM_INT));

            $action = 'redirect';

            $nextpageparams['action'] = 'grading';

        } else if ($action == 'reverttodraft') {

            $this->process_revert_to_draft();

            $action = 'redirect';

            $nextpageparams['action'] = 'grading';

        } else if ($action == 'unlock') {

            $this->process_unlock_submission();

            $action = 'redirect';

            $nextpageparams['action'] = 'grading';

        } else if ($action == 'setbatchmarkingworkflowstate') {

            $this->process_set_batch_marking_workflow_state();

            $action = 'redirect';

            $nextpageparams['action'] = 'grading';

        } else if ($action == 'setbatchmarkingallocation') {

            $this->process_set_batch_marking_allocation();

            $action = 'redirect';

            $nextpageparams['action'] = 'grading';

        } else if ($action == 'confirmsubmit') {

            $action = 'submit';

            if ($this->process_submit_for_grading($mform, $notices)) {

                $action = 'redirect';

                $nextpageparams['action'] = 'view';

            } else if ($notices) {

                $action = 'viewsubmitforgradingerror';

            }

        } else if ($action == 'submitotherforgrading') {

            if ($this->process_submit_other_for_grading($mform, $notices)) {

                $action = 'redirect';

                $nextpageparams['action'] = 'grading';

            } else {

                $action = 'viewsubmitforgradingerror';

            }

        } else if ($action == 'gradingbatchoperation') {

            $action = $this->process_grading_batch_operation($mform);

            if ($action == 'grading') {

                $action = 'redirect';

                $nextpageparams['action'] = 'grading';

            }

        } else if ($action == 'submitgrade') {

            if (optional_param('saveandshownext', null, PARAM_RAW)) {

                // Save and show next.

                $action = 'grade';

                if ($this->process_save_grade($mform)) {

                    $action = 'redirect';

                    $nextpageparams['action'] = 'grade';

                    $nextpageparams['rownum'] = optional_param('rownum', 0, PARAM_INT) + 1;

                    $nextpageparams['useridlistid'] = optional_param('useridlistid', $this->get_useridlist_key_id(), PARAM_ALPHANUM);

                }

            } else if (optional_param('nosaveandprevious', null, PARAM_RAW)) {

                $action = 'redirect';

                $nextpageparams['action'] = 'grade';

                $nextpageparams['rownum'] = optional_param('rownum', 0, PARAM_INT) - 1;

                $nextpageparams['useridlistid'] = optional_param('useridlistid', $this->get_useridlist_key_id(), PARAM_ALPHANUM);

            } else if (optional_param('nosaveandnext', null, PARAM_RAW)) {

                $action = 'redirect';

                $nextpageparams['action'] = 'grade';

                $nextpageparams['rownum'] = optional_param('rownum', 0, PARAM_INT) + 1;

                $nextpageparams['useridlistid'] = optional_param('useridlistid', $this->get_useridlist_key_id(), PARAM_ALPHANUM);

            } else if (optional_param('savegrade', null, PARAM_RAW)) {

                // Save changes button.

                $action = 'grade';

                if ($this->process_save_grade($mform)) {

                    $action = 'redirect';

                    $nextpageparams['action'] = 'savegradingresult';

                }

            } else {

                // Cancel button.

                $action = 'redirect';

                $nextpageparams['action'] = 'grading';

            }

        } else if ($action == 'quickgrade') {

            $message = $this->process_save_quick_grades();

            $action = 'quickgradingresult';

        } else if ($action == 'saveoptions') {

            $this->process_save_grading_options();

            $action = 'redirect';

            $nextpageparams['action'] = 'grading';

        } else if ($action == 'saveextension') {

            $action = 'grantextension';

            if ($this->process_save_extension($mform)) {

                $action = 'redirect';

                $nextpageparams['action'] = 'grading';

            }

        } else if ($action == 'revealidentitiesconfirm') {

            $this->process_reveal_identities();

            $action = 'redirect';

            $nextpageparams['action'] = 'grading';

        }

        $returnparams = array(

            'rownum' => optional_param('rownum', 0, PARAM_INT),

            'useridlistid' => optional_param('useridlistid', $this->get_useridlist_key_id(), PARAM_ALPHANUM)

        );

        $this->register_return_link($action, $returnparams);

        // Include any page action as part of the body tag CSS id.

        if (!empty($action)) {

            $PAGE->set_pagetype('mod-assign-' . $action);

        }

        // Now show the right view page.

        if ($action == 'redirect') {

            $nextpageurl = new moodle_url('/mod/assign/view.php', $nextpageparams);

            $messages = '';

            $messagetype = \core\output\notification::NOTIFY_INFO;

            $errors = $this->get_error_messages();

            if (!empty($errors)) {

                $messages = html_writer::alist($errors, ['class' => 'mb-1 mt-1']);

                $messagetype = \core\output\notification::NOTIFY_ERROR;

            }

            redirect($nextpageurl, $messages, null, $messagetype);

            return;

        } else if ($action == 'savegradingresult') {

            $message = get_string('gradingchangessaved', 'assign');

            $o .= $this->view_savegrading_result($message);

        } else if ($action == 'quickgradingresult') {

            $mform = null;

            $o .= $this->view_quickgrading_result($message);

        } else if ($action == 'gradingpanel') {

            $o .= $this->view_single_grading_panel($args);

        } else if ($action == 'grade') {

            $o .= $this->view_single_grade_page($mform);

        } else if ($action == 'viewpluginassignfeedback') {

            $o .= $this->view_plugin_content('assignfeedback');

        } else if ($action == 'viewpluginassignsubmission') {

            $o .= $this->view_plugin_content('assignsubmission');

        } else if ($action == 'editsubmission') {

            $PAGE->add_body_class('limitedwidth');

            $o .= $this->view_edit_submission_page($mform, $notices);

        } else if ($action == 'grader') {

            $o .= $this->view_grader();

        } else if ($action == 'grading') {

            $o .= $this->view_grading_page();

        } else if ($action == 'downloadall') {

            $o .= $this->download_submissions();

        } else if ($action == 'submit') {

            $PAGE->add_body_class('limitedwidth');

            $o .= $this->check_submit_for_grading($mform);

        } else if ($action == 'grantextension') {

            $o .= $this->view_grant_extension($mform);

        } else if ($action == 'revealidentities') {

            $o .= $this->view_reveal_identities_confirm($mform);

        } else if ($action == 'removesubmissionconfirm') {

            $PAGE->add_body_class('limitedwidth');

            $o .= $this->view_remove_submission_confirm();

        } else if ($action == 'plugingradingbatchoperation') {

            $o .= $this->view_plugin_grading_batch_operation($mform);

        } else if ($action == 'viewpluginpage') {

            $o .= $this->view_plugin_page();

        } else if ($action == 'viewcourseindex') {

            $o .= $this->view_course_index();

        } else if ($action == 'viewbatchsetmarkingworkflowstate') {

            $o .= $this->view_batch_set_workflow_state($mform);

        } else if ($action == 'viewbatchmarkingallocation') {

            $o .= $this->view_batch_markingallocation($mform);

        } else if ($action == 'viewsubmitforgradingerror') {

            $o .= $this->view_error_page(get_string('submitforgrading', 'assign'), $notices);

        } else if ($action == 'fixrescalednullgrades') {

            $o .= $this->view_fix_rescaled_null_grades();

        } else {

            $PAGE->add_body_class('limitedwidth');

            $o .= $this->view_submission_page();

        }

        return $o;

    }

    /**

     * Add this instance to the database.

     *

     * @param stdClass $formdata The data submitted from the form

     * @param bool $callplugins This is used to skip the plugin code

     *             when upgrading an old assignment to a new one (the plugins get called manually)

     * @return mixed false if an error occurs or the int id of the new instance

     */

    public function add_instance(stdClass $formdata, $callplugins)

    {

        global $DB;

        $adminconfig = $this->get_admin_config();

        $err = '';

        // Add the database record.

        $update = new stdClass();

        $update->name = $formdata->name;

        $update->timemodified = time();

        $update->timecreated = time();

        $update->course = $formdata->course;

        $update->courseid = $formdata->course;

        $update->intro = $formdata->intro;

        $update->introformat = $formdata->introformat;

        $update->alwaysshowdescription = !empty($formdata->alwaysshowdescription);

        if (isset($formdata->activityeditor)) {

            $update->activity = $this->save_editor_draft_files($formdata);

            $update->activityformat = $formdata->activityeditor['format'];

        }

        if (isset($formdata->submissionattachments)) {

            $update->submissionattachments = $formdata->submissionattachments;

        }

        $update->submissiondrafts = $formdata->submissiondrafts;

        $update->requiresubmissionstatement = $formdata->requiresubmissionstatement;

        $update->sendnotifications = $formdata->sendnotifications;

        $update->sendlatenotifications = $formdata->sendlatenotifications;

        $update->sendstudentnotifications = $adminconfig->sendstudentnotifications;

        if (isset($formdata->sendstudentnotifications)) {

            $update->sendstudentnotifications = $formdata->sendstudentnotifications;

        }

        $update->duedate = $formdata->duedate;

        $update->cutoffdate = $formdata->cutoffdate;

        $update->gradingduedate = $formdata->gradingduedate;

        if (isset($formdata->timelimit)) {

            $update->timelimit = $formdata->timelimit;

        }

        $update->allowsubmissionsfromdate = $formdata->allowsubmissionsfromdate;

        $update->grade = $formdata->grade;

        $update->completionsubmit = !empty($formdata->completionsubmit);

        $update->teamsubmission = $formdata->teamsubmission;

        $update->requireallteammemberssubmit = $formdata->requireallteammemberssubmit;

        if (isset($formdata->teamsubmissiongroupingid)) {

            $update->teamsubmissiongroupingid = $formdata->teamsubmissiongroupingid;

        }

        $update->blindmarking = $formdata->blindmarking;

        if (isset($formdata->hidegrader)) {

            $update->hidegrader = $formdata->hidegrader;

        }

        $update->attemptreopenmethod = ASSIGN_ATTEMPT_REOPEN_METHOD_NONE;

        if (!empty($formdata->attemptreopenmethod)) {

            $update->attemptreopenmethod = $formdata->attemptreopenmethod;

        }

        if (!empty($formdata->maxattempts)) {

            $update->maxattempts = $formdata->maxattempts;

        }

        if (isset($formdata->preventsubmissionnotingroup)) {

            $update->preventsubmissionnotingroup = $formdata->preventsubmissionnotingroup;

        }

        $update->markingworkflow = $formdata->markingworkflow;

        $update->markingallocation = $formdata->markingallocation;

        if (empty($update->markingworkflow)) { // If marking workflow is disabled, make sure allocation is disabled.

            $update->markingallocation = 0;

        }

        if (isset($formdata->markinganonymous)) {

            // If marking workflow is disabled, or anonymous submissions is disabled then make sure marking anonymous is disabled.

            if (empty($update->markingworkflow) || empty($update->blindmarking)) {

                $update->markinganonymous = 0;

            } else {

                $update->markinganonymous = $formdata->markinganonymous;

            }

        }

        $returnid = $DB->insert_record('assign', $update);

        $this->instance = $DB->get_record('assign', array('id' => $returnid), '*', MUST_EXIST);

        // Cache the course record.

        $this->course = $DB->get_record('course', array('id' => $formdata->course), '*', MUST_EXIST);

        $this->save_intro_draft_files($formdata);

        $this->save_editor_draft_files($formdata);

        if ($callplugins) {

            // Call save_settings hook for submission plugins.

            foreach ($this->submissionplugins as $plugin) {

                if (!$this->update_plugin_instance($plugin, $formdata)) {

                    throw new \moodle_exception($plugin->get_error());

                    return false;

                }

            }

            foreach ($this->feedbackplugins as $plugin) {

                if (!$this->update_plugin_instance($plugin, $formdata)) {

                    throw new \moodle_exception($plugin->get_error());

                    return false;

                }

            }

            // In the case of upgrades the coursemodule has not been set,

            // so we need to wait before calling these two.

            $this->update_calendar($formdata->coursemodule);

            if (!empty($formdata->completionexpected)) {

                \core_completion\api::update_completion_date_event(

                    $formdata->coursemodule,

                    'assign',

                    $this->instance,

                    $formdata->completionexpected

                );

            }

            $this->update_gradebook(false, $formdata->coursemodule);

        }

        $update = new stdClass();

        $update->id = $this->get_instance()->id;

        $update->nosubmissions = (!$this->is_any_submission_plugin_enabled()) ? 1 : 0;

        $DB->update_record('assign', $update);

        return $returnid;

    }

    /**

     * Delete all grades from the gradebook for this assignment.

     *

     * @return bool

     */

    protected function delete_grades()

    {

        global $CFG;

        $result = grade_update(

            'mod/assign',

            $this->get_course()->id,

            'mod',

            'assign',

            $this->get_instance()->id,

            0,

            null,

            array('deleted' => 1)

        );

        return $result == GRADE_UPDATE_OK;

    }

    /**

     * Delete this instance from the database.

     *

     * @return bool false if an error occurs

     */

    public function delete_instance()

    {

        global $DB;

        $result = true;

        foreach ($this->submissionplugins as $plugin) {

            if (!$plugin->delete_instance()) {

                throw new \moodle_exception($plugin->get_error());

                $result = false;

            }

        }

        foreach ($this->feedbackplugins as $plugin) {

            if (!$plugin->delete_instance()) {

                throw new \moodle_exception($plugin->get_error());

                $result = false;

            }

        }

        // Delete files associated with this assignment.

        $fs = get_file_storage();

        if (! $fs->delete_area_files($this->context->id)) {

            $result = false;

        }

        $this->delete_all_overrides();

        // Delete_records will throw an exception if it fails - so no need for error checking here.

        $DB->delete_records('assign_submission', array('assignment' => $this->get_instance()->id));

        $DB->delete_records('assign_grades', array('assignment' => $this->get_instance()->id));

        $DB->delete_records('assign_plugin_config', array('assignment' => $this->get_instance()->id));

        $DB->delete_records('assign_user_flags', array('assignment' => $this->get_instance()->id));

        $DB->delete_records('assign_user_mapping', array('assignment' => $this->get_instance()->id));

        // Delete items from the gradebook.

        if (! $this->delete_grades()) {

            $result = false;

        }

        // Delete the instance.

        // We must delete the module record after we delete the grade item.

        $DB->delete_records('assign', array('id' => $this->get_instance()->id));

        return $result;

    }

    /**

     * Deletes a assign override from the database and clears any corresponding calendar events

     *

     * @param int $overrideid The id of the override being deleted

     * @return bool true on success

     */

    public function delete_override($overrideid)

    {

        global $CFG, $DB;

        require_once($CFG->dirroot . '/calendar/lib.php');

        $cm = $this->get_course_module();

        if (empty($cm)) {

            $instance = $this->get_instance();

            $cm = get_coursemodule_from_instance('assign', $instance->id, $instance->course);

        }

        $override = $DB->get_record('assign_overrides', array('id' => $overrideid), '*', MUST_EXIST);

        // Delete the events.

        $conds = array('modulename' => 'assign', 'instance' => $this->get_instance()->id);

        if (isset($override->userid)) {

            $conds['userid'] = $override->userid;

            $cachekey = "{$cm->instance}_u_{$override->userid}";

        } else {

            $conds['groupid'] = $override->groupid;

            $cachekey = "{$cm->instance}_g_{$override->groupid}";

        }

        $events = $DB->get_records('event', $conds);

        foreach ($events as $event) {

            $eventold = calendar_event::load($event);

            $eventold->delete();

        }

        $DB->delete_records('assign_overrides', array('id' => $overrideid));

        cache::make('mod_assign', 'overrides')->delete($cachekey);

        // Set the common parameters for one of the events we will be triggering.

        $params = array(

            'objectid' => $override->id,

            'context' => context_module::instance($cm->id),

            'other' => array(

                'assignid' => $override->assignid

            )

        );

        // Determine which override deleted event to fire.

        if (!empty($override->userid)) {

            $params['relateduserid'] = $override->userid;

            $event = \mod_assign\event\user_override_deleted::create($params);

        } else {

            $params['other']['groupid'] = $override->groupid;

            $event = \mod_assign\event\group_override_deleted::create($params);

        }

        // Trigger the override deleted event.

        $event->add_record_snapshot('assign_overrides', $override);

        $event->trigger();

        return true;

    }

    /**

     * Deletes all assign overrides from the database and clears any corresponding calendar events

     */

    public function delete_all_overrides()

    {

        global $DB;