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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/>.

/**
 * Cluster
 *
 * @package mod_lesson
 * @copyright  2009 Sam Hemelryk
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 **/

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

/** Start of Cluster page */
define("LESSON_PAGE_CLUSTER",   "30");

class lesson_page_type_cluster extends lesson_page {

protected $type = lesson_page::TYPE_STRUCTURE;
    protected $typeidstring = 'cluster';
    protected $typeid = LESSON_PAGE_CLUSTER;
    protected $string = null;
    protected $jumpto = null;

public function display($renderer, $attempt) {
        return '';
    }

public function get_typeid() {
        return $this->typeid;
    }
    public function get_typestring() {
        if ($this->string===null) {
            $this->string = get_string($this->typeidstring, 'lesson');
        }
        return $this->string;
    }
    public function get_idstring() {
        return $this->typeidstring;
    }
    public function get_grayout() {
        return 1;
    }
    public function callback_on_view($canmanage, $redirect = true) {
        global $USER;
        if (!$canmanage) {
            // Get the next page in the lesson cluster jump
            return (int) $this->lesson->cluster_jump($this->properties->id);
        } else {
            // get the next page
            return (int) $this->properties->nextpageid;
        }
    }
    public function override_next_page() {
        global $USER;
        return $this->lesson->cluster_jump($this->properties->id);
    }
    public function add_page_link($previd) {
        global $PAGE, $CFG;
        $addurl = new moodle_url('/mod/lesson/editpage.php', array('id'=>$PAGE->cm->id, 'pageid'=>$previd, 'sesskey'=>sesskey(), 'qtype'=>LESSON_PAGE_CLUSTER));
        return array('addurl'=>$addurl, 'type'=>LESSON_PAGE_CLUSTER, 'name'=>get_string('addcluster', 'lesson'));
    }
    public function valid_page_and_view(&$validpages, &$pageviews) {
        $validpages[$this->properties->id] = 1;  // add the cluster page as a valid page
        foreach ($this->lesson->get_sub_pages_of($this->properties->id, array(LESSON_PAGE_ENDOFCLUSTER)) as $subpage) {
            if (in_array($subpage->id, $pageviews)) {
                unset($pageviews[array_search($subpage->id, $pageviews)]);  // remove it
                // since the user did see one page in the cluster, add the cluster pageid to the viewedpageids
                if (!in_array($this->properties->id, $pageviews)) {
                    $pageviews[] = $this->properties->id;
                }
            }
        }
        return $this->properties->nextpageid;
    }

/**
     * Creates answers within the database for this cluster page. Usually only ever
     * called when creating a new page instance.
     * @param object $properties
     * @return array
     */
    public function create_answers($properties) {
        global $DB;

$newanswer = new stdClass;
        $newanswer->lessonid = $this->lesson->id;
        $newanswer->pageid = $this->properties->id;
        $newanswer->timecreated = $this->properties->timecreated;

if (isset($properties->jumpto[0])) {
            $newanswer->jumpto = $properties->jumpto[0];
        }
        $newanswer->id = $DB->insert_record('lesson_answers', $newanswer);
        $answers = [$newanswer->id => new lesson_page_answer($newanswer)];
        $this->answers = $answers;
        return $answers;
    }
}

class lesson_add_page_form_cluster extends lesson_add_page_form_base {

public $qtype = LESSON_PAGE_CLUSTER;
    public $qtypestring = 'cluster';
    protected $standard = false;

public function custom_definition() {
        global $PAGE, $CFG;

$mform = $this->_form;
        $lesson = $this->_customdata['lesson'];
        $jumptooptions = lesson_page_type_branchtable::get_jumptooptions(optional_param('firstpage', false, PARAM_BOOL), $lesson);

$mform->addElement('hidden', 'firstpage');
        $mform->setType('firstpage', PARAM_BOOL);

$mform->addElement('hidden', 'qtype');
        $mform->setType('qtype', PARAM_TEXT);

$mform->addElement('text', 'title', get_string("pagetitle", "lesson"), ['size' => 70, 'maxlength' => 255]);
        $mform->addRule('title', get_string('maximumchars', '', 255), 'maxlength', 255, 'client');
        if (!empty($CFG->formatstringstriptags)) {
            $mform->setType('title', PARAM_TEXT);
        } else {
            $mform->setType('title', PARAM_CLEANHTML);
        }

$this->editoroptions = array('noclean'=>true, 'maxfiles'=>EDITOR_UNLIMITED_FILES, 'maxbytes'=>$PAGE->course->maxbytes);
        $mform->addElement('editor', 'contents_editor', get_string("pagecontents", "lesson"), null, $this->editoroptions);
        $mform->setType('contents_editor', PARAM_RAW);

$this->add_jumpto(0);
    }

public function construction_override($pageid, lesson $lesson) {
        global $PAGE, $CFG, $DB;
        require_sesskey();

$timenow = time();

if ($pageid == 0) {
            if ($lesson->has_pages()) {
                if (!$page = $DB->get_record("lesson_pages", array("prevpageid" => 0, "lessonid" => $lesson->id))) {
                    throw new \moodle_exception('cannotfindpagerecord', 'lesson');
                }
            } else {
                // This is the ONLY page
                $page = new stdClass;
                $page->id = 0;
            }
        } else {
            if (!$page = $DB->get_record("lesson_pages", array("id" => $pageid))) {
                throw new \moodle_exception('cannotfindpagerecord', 'lesson');
            }
        }
        $newpage = new stdClass;
        $newpage->lessonid = $lesson->id;
        $newpage->prevpageid = $pageid;
        if ($pageid != 0) {
            $newpage->nextpageid = $page->nextpageid;
        } else {
            $newpage->nextpageid = $page->id;
        }
        $newpage->qtype = $this->qtype;
        $newpage->timecreated = $timenow;
        $newpage->title = get_string("clustertitle", "lesson");
        $newpage->contents = get_string("clustertitle", "lesson");
        $newpageid = $DB->insert_record("lesson_pages", $newpage);
        // update the linked list...
        if ($pageid != 0) {
            $DB->set_field("lesson_pages", "nextpageid", $newpageid, array("id" => $pageid));
        }

if ($pageid == 0) {
            $page->nextpageid = $page->id;
        }
        if ($page->nextpageid) {
            // the new page is not the last page
            $DB->set_field("lesson_pages", "prevpageid", $newpageid, array("id" => $page->nextpageid));
        }
        // ..and the single "answer"
        $newanswer = new stdClass;
        $newanswer->lessonid = $lesson->id;
        $newanswer->pageid = $newpageid;
        $newanswer->timecreated = $timenow;
        $newanswer->jumpto = LESSON_CLUSTERJUMP;
        $newanswerid = $DB->insert_record("lesson_answers", $newanswer);
        $lesson->add_message(get_string('addedcluster', 'lesson'), 'notifysuccess');
        redirect($CFG->wwwroot.'/mod/lesson/edit.php?id='.$PAGE->cm->id);
    }
}

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