<?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    core_tag
 * @category   tag
 * @copyright  2007 Luiz Cruz <luiz.laydner@gmail.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once('../config.php');
require_once('lib.php');
require_once('edit_form.php');

$tag_id = optional_param('id', 0, PARAM_INT);
$tag_name = optional_param('tag', '', PARAM_TAG);
$returnurl = optional_param('returnurl', '', PARAM_LOCALURL);

require_login();

if (empty($CFG->usetags)) {
    print_error('tagsaredisabled', 'tag');
}

//Editing a tag requires moodle/tag:edit capability
$systemcontext   = context_system::instance();
require_capability('moodle/tag:edit', $systemcontext);

if ($tag_name) {
    $tag = tag_get('name', $tag_name, '*');
} else if ($tag_id) {
    $tag = tag_get('id', $tag_id, '*');
}

if (empty($tag)) {
    redirect($CFG->wwwroot.'/tag/search.php');
}

$PAGE->set_url('/tag/index.php', array('id' => $tag->id));
$PAGE->set_subpage($tag->id);
$PAGE->set_context($systemcontext);
$PAGE->set_blocks_editing_capability('moodle/tag:editblocks');
$PAGE->set_pagelayout('standard');

$tagname = tag_display_name($tag);

// set the relatedtags field of the $tag object that will be passed to the form
$tag->relatedtags = tag_get_tags_array('tag', $tag->id);

$options = new stdClass();
$options->smiley = false;
$options->filter = false;

// convert and remove any XSS
$tag->description       = format_text($tag->description, $tag->descriptionformat, $options);
$tag->descriptionformat = FORMAT_HTML;

$errorstring = '';

$editoroptions = array(
    'maxfiles'  => EDITOR_UNLIMITED_FILES,
    'maxbytes'  => $CFG->maxbytes,
    'trusttext' => false,
    'context'   => $systemcontext,
    'subdirs'   => file_area_contains_subdirs($systemcontext, 'tag', 'description', $tag->id),
);
$tag = file_prepare_standard_editor($tag, 'description', $editoroptions, $systemcontext, 'tag', 'description', $tag->id);

$tagform = new tag_edit_form(null, compact('editoroptions'));
if ( $tag->tagtype == 'official' ) {
    $tag->tagtype = '1';
} else {
    $tag->tagtype = '0';
}

$tag->returnurl = $returnurl;
$tagform->set_data($tag);

// If new data has been sent, update the tag record
if ($tagform->is_cancelled()) {
    redirect($returnurl ? new moodle_url($returnurl) :
        new moodle_url('/tag/index.php', array('tag' => $tag->name)));
} else if ($tagnew = $tagform->get_data()) {

    if (has_capability('moodle/tag:manage', $systemcontext)) {
        if (($tag->tagtype != 'default') && (!isset($tagnew->tagtype) || ($tagnew->tagtype != '1'))) {
            tag_type_set($tag->id, 'default');

        } elseif (($tag->tagtype != 'official') && ($tagnew->tagtype == '1')) {
            tag_type_set($tag->id, 'official');
        }
    }

    if (!has_capability('moodle/tag:manage', $systemcontext)) {
        unset($tagnew->name);
        unset($tagnew->rawname);

    } else {  // They might be trying to change the rawname, make sure it's a change that doesn't affect name
        $norm = tag_normalize($tagnew->rawname, TAG_CASE_LOWER);
        $tagnew->name = array_shift($norm);

        if ($tag->rawname !== $tagnew->rawname) {  // The name has changed, let's make sure it's not another existing tag
            if (($id = tag_get_id($tagnew->name)) && $id != $tag->id) { // Something exists already, so flag an error.
                $errorstring = s($tagnew->rawname).': '.get_string('namesalreadybeeingused', 'tag');
            }
        }
    }

    if (empty($errorstring)) {    // All is OK, let's save it

        $tagnew = file_postupdate_standard_editor($tagnew, 'description', $editoroptions, $systemcontext, 'tag', 'description', $tag->id);

        if ($tag->description != $tagnew->description) {
            tag_description_set($tag_id, $tagnew->description, $tagnew->descriptionformat);
        }

        $tagnew->timemodified = time();

        if (has_capability('moodle/tag:manage', $systemcontext)) {
            // Check if we need to rename the tag.
            if (isset($tagnew->name) && ($tag->rawname != $tagnew->rawname)) {
                // Rename the tag.
                if (!tag_rename($tag->id, $tagnew->rawname)) {
                    print_error('errorupdatingrecord', 'tag');
                }
            }
        }

        //updated related tags
        tag_set('tag', $tagnew->id, $tagnew->relatedtags, 'core', $systemcontext->id);
        //print_object($tagnew); die();

        $tagname = isset($tagnew->rawname) ? $tagnew->rawname : $tag->rawname;
        redirect($returnurl ? new moodle_url($returnurl) :
            new moodle_url('/tag/index.php', array('tag' => $tagname)));
    }
}

navigation_node::override_active_url(new moodle_url('/tag/search.php'));
$PAGE->navbar->add($tagname);
$PAGE->navbar->add(get_string('edit'));
$PAGE->set_title(get_string('tag', 'tag') . ' - '. $tagname);
$PAGE->set_heading($COURSE->fullname);
echo $OUTPUT->header();
echo $OUTPUT->heading($tagname, 2);

if (!empty($errorstring)) {
    echo $OUTPUT->notification($errorstring);
}

$tagform->display();

echo $OUTPUT->footer();