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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/>.

/**
 * @package   mod_forum
 * @copyright Jamie Pratt <me@jamiep.org>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

if (!defined('MOODLE_INTERNAL')) {
    die('Direct access to this script is forbidden.');    ///  It must be included from a Moodle page
}

require_once ($CFG->dirroot.'/course/moodleform_mod.php');

class mod_forum_mod_form extends moodleform_mod {

function definition() {
        global $CFG, $COURSE, $DB;

$mform    =& $this->_form;

//-------------------------------------------------------------------------------
        $mform->addElement('header', 'general', get_string('general', 'form'));

$mform->addElement('text', 'name', get_string('forumname', 'forum'), array('size'=>'64'));
        if (!empty($CFG->formatstringstriptags)) {
            $mform->setType('name', PARAM_TEXT);
        } else {
            $mform->setType('name', PARAM_CLEANHTML);
        }
        $mform->addRule('name', null, 'required', null, 'client');
        $mform->addRule('name', get_string('maximumchars', '', 255), 'maxlength', 255, 'client');

$this->standard_intro_elements(get_string('forumintro', 'forum'));

$forumtypes = forum_get_forum_types();
        core_collator::asort($forumtypes, core_collator::SORT_STRING);
        $mform->addElement('select', 'type', get_string('forumtype', 'forum'), $forumtypes);
        $mform->addHelpButton('type', 'forumtype', 'forum');
        $mform->setDefault('type', 'general');

$mform->addElement('header', 'availability', get_string('availability', 'forum'));

$name = get_string('duedate', 'forum');
        $mform->addElement('date_time_selector', 'duedate', $name, array('optional' => true));
        $mform->addHelpButton('duedate', 'duedate', 'forum');

$name = get_string('cutoffdate', 'forum');
        $mform->addElement('date_time_selector', 'cutoffdate', $name, array('optional' => true));
        $mform->addHelpButton('cutoffdate', 'cutoffdate', 'forum');

// Attachments and word count.
        $mform->addElement('header', 'attachmentswordcounthdr', get_string('attachmentswordcount', 'forum'));

$choices = get_max_upload_sizes($CFG->maxbytes, $COURSE->maxbytes, 0, $CFG->forum_maxbytes);
        $choices[1] = get_string('uploadnotallowed');
        $mform->addElement('select', 'maxbytes', get_string('maxattachmentsize', 'forum'), $choices);
        $mform->addHelpButton('maxbytes', 'maxattachmentsize', 'forum');
        $mform->setDefault('maxbytes', $CFG->forum_maxbytes);

$choices = array(
            0 => 0,
            1 => 1,
            2 => 2,
            3 => 3,
            4 => 4,
            5 => 5,
            6 => 6,
            7 => 7,
            8 => 8,
            9 => 9,
            10 => 10,
            20 => 20,
            50 => 50,
            100 => 100
        );
        $mform->addElement('select', 'maxattachments', get_string('maxattachments', 'forum'), $choices);
        $mform->addHelpButton('maxattachments', 'maxattachments', 'forum');
        $mform->setDefault('maxattachments', $CFG->forum_maxattachments);

$mform->addElement('selectyesno', 'displaywordcount', get_string('displaywordcount', 'forum'));
        $mform->addHelpButton('displaywordcount', 'displaywordcount', 'forum');
        $mform->setDefault('displaywordcount', 0);

// Subscription and tracking.
        $mform->addElement('header', 'subscriptionandtrackinghdr', get_string('subscriptionandtracking', 'forum'));

$options = forum_get_subscriptionmode_options();
        $mform->addElement('select', 'forcesubscribe', get_string('subscriptionmode', 'forum'), $options);
        $mform->addHelpButton('forcesubscribe', 'subscriptionmode', 'forum');
        if (isset($CFG->forum_subscription)) {
            $defaultforumsubscription = $CFG->forum_subscription;
        } else {
            $defaultforumsubscription = FORUM_CHOOSESUBSCRIBE;
        }
        $mform->setDefault('forcesubscribe', $defaultforumsubscription);

$options = array();
        $options[FORUM_TRACKING_OPTIONAL] = get_string('trackingoptional', 'forum');
        $options[FORUM_TRACKING_OFF] = get_string('trackingoff', 'forum');
        if ($CFG->forum_allowforcedreadtracking) {
            $options[FORUM_TRACKING_FORCED] = get_string('trackingon', 'forum');
        }
        $mform->addElement('select', 'trackingtype', get_string('trackingtype', 'forum'), $options);
        $mform->addHelpButton('trackingtype', 'trackingtype', 'forum');
        $default = $CFG->forum_trackingtype;
        if ((!$CFG->forum_allowforcedreadtracking) && ($default == FORUM_TRACKING_FORCED)) {
            $default = FORUM_TRACKING_OPTIONAL;
        }
        $mform->setDefault('trackingtype', $default);

if ($CFG->enablerssfeeds && isset($CFG->forum_enablerssfeeds) && $CFG->forum_enablerssfeeds) {
//-------------------------------------------------------------------------------
            $mform->addElement('header', 'rssheader', get_string('rss'));
            $choices = array();
            $choices[0] = get_string('none');
            $choices[1] = get_string('discussions', 'forum');
            $choices[2] = get_string('posts', 'forum');
            $mform->addElement('select', 'rsstype', get_string('rsstype'), $choices);
            $mform->addHelpButton('rsstype', 'rsstype', 'forum');
            if (isset($CFG->forum_rsstype)) {
                $mform->setDefault('rsstype', $CFG->forum_rsstype);
            }

$choices = array();
            $choices[0] = '0';
            $choices[1] = '1';
            $choices[2] = '2';
            $choices[3] = '3';
            $choices[4] = '4';
            $choices[5] = '5';
            $choices[10] = '10';
            $choices[15] = '15';
            $choices[20] = '20';
            $choices[25] = '25';
            $choices[30] = '30';
            $choices[40] = '40';
            $choices[50] = '50';
            $mform->addElement('select', 'rssarticles', get_string('rssarticles'), $choices);
            $mform->addHelpButton('rssarticles', 'rssarticles', 'forum');
            $mform->hideIf('rssarticles', 'rsstype', 'eq', '0');
            if (isset($CFG->forum_rssarticles)) {
                $mform->setDefault('rssarticles', $CFG->forum_rssarticles);
            }
        }

$mform->addElement('header', 'discussionlocking', get_string('discussionlockingheader', 'forum'));
        $options = [
            0               => get_string('discussionlockingdisabled', 'forum'),
            1   * DAYSECS   => get_string('numday', 'core', 1),
            1   * WEEKSECS  => get_string('numweek', 'core', 1),
            2   * WEEKSECS  => get_string('numweeks', 'core', 2),
            30  * DAYSECS   => get_string('nummonth', 'core', 1),
            60  * DAYSECS   => get_string('nummonths', 'core', 2),
            90  * DAYSECS   => get_string('nummonths', 'core', 3),
            180 * DAYSECS   => get_string('nummonths', 'core', 6),
            1   * YEARSECS  => get_string('numyear', 'core', 1),
        ];
        $mform->addElement('select', 'lockdiscussionafter', get_string('lockdiscussionafter', 'forum'), $options);
        $mform->addHelpButton('lockdiscussionafter', 'lockdiscussionafter', 'forum');
        $mform->disabledIf('lockdiscussionafter', 'type', 'eq', 'single');

//-------------------------------------------------------------------------------
        $mform->addElement('header', 'blockafterheader', get_string('blockafter', 'forum'));
        $options = array();
        $options[0] = get_string('blockperioddisabled','forum');
        $options[60*60*24]   = '1 '.get_string('day');
        $options[60*60*24*2] = '2 '.get_string('days');
        $options[60*60*24*3] = '3 '.get_string('days');
        $options[60*60*24*4] = '4 '.get_string('days');
        $options[60*60*24*5] = '5 '.get_string('days');
        $options[60*60*24*6] = '6 '.get_string('days');
        $options[60*60*24*7] = '1 '.get_string('week');
        $mform->addElement('select', 'blockperiod', get_string('blockperiod', 'forum'), $options);
        $mform->addHelpButton('blockperiod', 'blockperiod', 'forum');

$mform->addElement('text', 'blockafter', get_string('blockafter', 'forum'));
        $mform->setType('blockafter', PARAM_INT);
        $mform->setDefault('blockafter', '0');
        $mform->addRule('blockafter', null, 'numeric', null, 'client');
        $mform->addHelpButton('blockafter', 'blockafter', 'forum');
        $mform->hideIf('blockafter', 'blockperiod', 'eq', 0);

$mform->addElement('text', 'warnafter', get_string('warnafter', 'forum'));
        $mform->setType('warnafter', PARAM_INT);
        $mform->setDefault('warnafter', '0');
        $mform->addRule('warnafter', null, 'numeric', null, 'client');
        $mform->addHelpButton('warnafter', 'warnafter', 'forum');
        $mform->hideIf('warnafter', 'blockperiod', 'eq', 0);

$coursecontext = context_course::instance($COURSE->id);
        plagiarism_get_form_elements_module($mform, $coursecontext, 'mod_forum');

//-------------------------------------------------------------------------------

$this->standard_grading_coursemodule_elements();

$this->standard_coursemodule_elements();
//-------------------------------------------------------------------------------
// buttons
        $this->add_action_buttons();

}

function definition_after_data() {
        parent::definition_after_data();
        $mform     =& $this->_form;
        $type      =& $mform->getElement('type');
        $typevalue = $mform->getElementValue('type');

//we don't want to have these appear as possible selections in the form but
        //we want the form to display them if they are set.
        if ($typevalue[0]=='news') {
            $type->addOption(get_string('namenews', 'forum'), 'news');
            $mform->addHelpButton('type', 'namenews', 'forum');
            $type->freeze();
            $type->setPersistantFreeze(true);
        }
        if ($typevalue[0]=='social') {
            $type->addOption(get_string('namesocial', 'forum'), 'social');
            $type->freeze();
            $type->setPersistantFreeze(true);
        }

}

public function validation($data, $files) {
        $errors = parent::validation($data, $files);

if ($data['duedate'] && $data['cutoffdate']) {
            if ($data['duedate'] > $data['cutoffdate']) {
                $errors['cutoffdate'] = get_string('cutoffdatevalidation', 'forum');
            }
        }

return $errors;
    }

function data_preprocessing(&$default_values) {
        parent::data_preprocessing($default_values);

// Set up the completion checkboxes which aren't part of standard data.
        // We also make the default value (if you turn on the checkbox) for those
        // numbers to be 1, this will not apply unless checkbox is ticked.
        $default_values['completiondiscussionsenabled']=
            !empty($default_values['completiondiscussions']) ? 1 : 0;
        if (empty($default_values['completiondiscussions'])) {
            $default_values['completiondiscussions']=1;
        }
        $default_values['completionrepliesenabled']=
            !empty($default_values['completionreplies']) ? 1 : 0;
        if (empty($default_values['completionreplies'])) {
            $default_values['completionreplies']=1;
        }
        // Tick by default if Add mode or if completion posts settings is set to 1 or more.
        if (empty($this->_instance) || !empty($default_values['completionposts'])) {
            $default_values['completionpostsenabled'] = 1;
        } else {
            $default_values['completionpostsenabled'] = 0;
        }
        if (empty($default_values['completionposts'])) {
            $default_values['completionposts']=1;
        }
    }

/**
     * Add custom completion rules.
     *
     * @return array Array of string IDs of added items, empty array if none
     */
    public function add_completion_rules() {
        $mform =& $this->_form;

$group=array();
        $group[] =& $mform->createElement('checkbox', 'completionpostsenabled', '', get_string('completionposts','forum'));
        $group[] =& $mform->createElement('text', 'completionposts', '', array('size'=>3));
        $mform->setType('completionposts',PARAM_INT);
        $mform->addGroup($group, 'completionpostsgroup', get_string('completionpostsgroup','forum'), array(' '), false);
        $mform->disabledIf('completionposts','completionpostsenabled','notchecked');

$group=array();
        $group[] =& $mform->createElement('checkbox', 'completiondiscussionsenabled', '', get_string('completiondiscussions','forum'));
        $group[] =& $mform->createElement('text', 'completiondiscussions', '', array('size'=>3));
        $mform->setType('completiondiscussions',PARAM_INT);
        $mform->addGroup($group, 'completiondiscussionsgroup', get_string('completiondiscussionsgroup','forum'), array(' '), false);
        $mform->disabledIf('completiondiscussions','completiondiscussionsenabled','notchecked');

$group=array();
        $group[] =& $mform->createElement('checkbox', 'completionrepliesenabled', '', get_string('completionreplies','forum'));
        $group[] =& $mform->createElement('text', 'completionreplies', '', array('size'=>3));
        $mform->setType('completionreplies',PARAM_INT);
        $mform->addGroup($group, 'completionrepliesgroup', get_string('completionrepliesgroup','forum'), array(' '), false);
        $mform->disabledIf('completionreplies','completionrepliesenabled','notchecked');

return array('completiondiscussionsgroup','completionrepliesgroup','completionpostsgroup');
    }

function completion_rule_enabled($data) {
        return (!empty($data['completiondiscussionsenabled']) && $data['completiondiscussions']!=0) ||
            (!empty($data['completionrepliesenabled']) && $data['completionreplies']!=0) ||
            (!empty($data['completionpostsenabled']) && $data['completionposts']!=0);
    }

/**
     * Allows module to modify the data returned by form get_data().
     * This method is also called in the bulk activity completion form.
     *
     * Only available on moodleform_mod.
     *
     * @param stdClass $data the form data to be modified.
     */
    public function data_postprocessing($data) {
        parent::data_postprocessing($data);
        // Turn off completion settings if the checkboxes aren't ticked
        if (!empty($data->completionunlocked)) {
            $autocompletion = !empty($data->completion) && $data->completion==COMPLETION_TRACKING_AUTOMATIC;
            if (empty($data->completiondiscussionsenabled) || !$autocompletion) {
                $data->completiondiscussions = 0;
            }
            if (empty($data->completionrepliesenabled) || !$autocompletion) {
                $data->completionreplies = 0;
            }
            if (empty($data->completionpostsenabled) || !$autocompletion) {
                $data->completionposts = 0;
            }
        }
    }
}