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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/>.

/**
 * mod_wiki data generator.
 *
 * @package    mod_wiki
 * @category   test
 * @copyright  2013 Marina Glancy
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

/**
 * mod_wiki data generator class.
 *
 * @package    mod_wiki
 * @category   test
 * @copyright  2013 Marina Glancy
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class mod_wiki_generator extends testing_module_generator {

/**
     * @var int keep track of how many pages have been created.
     */
    protected $pagecount = 0;

/**
     * To be called from data reset code only,
     * do not use in tests.
     * @return void
     */
    public function reset() {
        $this->pagecount = 0;
        parent::reset();
    }

public function create_instance($record = null, array $options = null) {
        // Add default values for wiki.
        $record = (array)$record + array(
            'wikimode' => 'collaborative',
            'firstpagetitle' => 'Front page for wiki '.($this->instancecount+1),
            'defaultformat' => 'html',
            'forceformat' => 0
        );

return parent::create_instance($record, (array)$options);
    }

public function create_content($wiki, $record = array()) {
        $record = (array)$record + array(
            'wikiid' => $wiki->id
        );
        return $this->create_page($wiki, $record);
    }

public function create_first_page($wiki, $record = array()) {
        $record = (array)$record + array(
            'title' => $wiki->firstpagetitle,
        );
        return $this->create_page($wiki, $record);
    }

/**
     * Retrieves or generates a subwiki and returns its id
     *
     * @param stdClass $wiki
     * @param int $subwikiid
     * @param int $group
     * @param int $userid
     * @return int
     */
    public function get_subwiki($wiki, $subwikiid = null, $group = null, $userid = null) {
        global $USER, $DB;

if ($subwikiid) {
            $params = ['id' => $subwikiid, 'wikiid' => $wiki->id];
            if ($group !== null) {
                $params['group'] = $group;
            }
            if ($userid !== null) {
                $params['userid'] = $userid;
            }
            return $DB->get_field('wiki_subwikis', 'id', $params, MUST_EXIST);
        }

if ($userid === null) {
            $userid = ($wiki->wikimode == 'individual') ? $USER->id : 0;
        }
        if ($group === null) {
            $group = 0;
        }
        if ($subwiki = wiki_get_subwiki_by_group($wiki->id, $group, $userid)) {
            return $subwiki->id;
        } else {
            return wiki_add_subwiki($wiki->id, $group, $userid);
        }
    }

/**
     * Generates a page in wiki.
     *
     * @param stdClass wiki object returned from create_instance (if known)
     * @param stdClass|array $record data to insert as wiki entry.
     * @return stdClass
     * @throws coding_exception if neither $record->wikiid nor $wiki->id is specified
     */
    public function create_page($wiki, $record = array()) {
        global $CFG, $USER;
        require_once($CFG->dirroot.'/mod/wiki/locallib.php');
        $this->pagecount++;
        $record = (array)$record + array(
            'title' => 'wiki page '.$this->pagecount,
            'wikiid' => $wiki->id,
            'subwikiid' => 0,
            'group' => null,
            'userid' => null,
            'content' => 'Wiki page content '.$this->pagecount,
            'format' => $wiki->defaultformat
        );
        if (empty($record['wikiid']) && empty($record['subwikiid'])) {
            throw new coding_exception('wiki page generator requires either wikiid or subwikiid');
        }
        $record['subwikiid'] = $this->get_subwiki($wiki, $record['subwikiid'], $record['group'], $record['userid']);

$wikipage = wiki_get_page_by_title($record['subwikiid'], $record['title']);
        if (!$wikipage) {
            $pageid = wiki_create_page($record['subwikiid'], $record['title'], $record['format'], $USER->id);
            $wikipage = wiki_get_page($pageid);
        }
        $rv = wiki_save_page($wikipage, $record['content'], $USER->id);

if (array_key_exists('tags', $record)) {
            $tags = is_array($record['tags']) ? $record['tags'] : preg_split('/,/', $record['tags']);
            if (empty($wiki->cmid)) {
                $cm = get_coursemodule_from_instance('wiki', $wiki->id, isset($wiki->course) ? $wiki->course : 0);
                $wiki->cmid = $cm->id;
            }
            core_tag_tag::set_item_tags('mod_wiki', 'wiki_pages', $wikipage->id,
                    context_module::instance($wiki->cmid), $tags);
        }
        return $rv['page'];
    }
}