<?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/>.

/**
 * Managing tags, tag areas and tags collections
 *
 * @package    core_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($CFG->libdir.'/tablelib.php');
require_once('lib.php');
require_once($CFG->libdir.'/adminlib.php');

define('SHOW_ALL_PAGE_SIZE', 50000);
define('DEFAULT_PAGE_SIZE', 30);

$tagschecked = optional_param_array('tagschecked', array(), PARAM_INT);
$tagid       = optional_param('tagid', null, PARAM_INT);
$isstandard  = optional_param('isstandard', null, PARAM_INT);
$action      = optional_param('action', '', PARAM_ALPHA);
$perpage     = optional_param('perpage', DEFAULT_PAGE_SIZE, PARAM_INT);
$page        = optional_param('page', 0, PARAM_INT);
$tagcollid   = optional_param('tc', 0, PARAM_INT);
$tagareaid   = optional_param('ta', null, PARAM_INT);
$filter      = optional_param('filter', '', PARAM_NOTAGS);

$params = array();
if ($perpage != DEFAULT_PAGE_SIZE) {
    $params['perpage'] = $perpage;
}
if ($page > 0) {
    $params['page'] = $page;
}
if ($tagcollid) {
    $params['tc'] = $tagcollid;
}
if ($filter !== '') {
    $params['filter'] = $filter;
}

admin_externalpage_setup('managetags', '', $params, '', array('pagelayout' => 'report'));

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

$tagobject = null;
if ($tagid) {
    $tagobject = core_tag_tag::get($tagid, '*', MUST_EXIST);
    $tagcollid = $tagobject->tagcollid;
}
$tagcoll = core_tag_collection::get_by_id($tagcollid);
$tagarea = core_tag_area::get_by_id($tagareaid);
$manageurl = new moodle_url('/tag/manage.php');
if ($tagcoll) {
    // We are inside a tag collection - add it to the breadcrumb.
    $PAGE->navbar->add(core_tag_collection::display_name($tagcoll),
            new moodle_url($manageurl, array('tc' => $tagcoll->id)));
}

$PAGE->set_blocks_editing_capability('moodle/tag:editblocks');

switch($action) {

    case 'colladd':
        require_sesskey();
        $name = required_param('name', PARAM_NOTAGS);
        $searchable = optional_param('searchable', false, PARAM_BOOL);
        core_tag_collection::create(array('name' => $name, 'searchable' => $searchable));
        redirect($manageurl);
        break;

    case 'colldelete':
        if ($tagcoll && !$tagcoll->component) {
            require_sesskey();
            core_tag_collection::delete($tagcoll);
            \core\notification::success(get_string('changessaved', 'core_tag'));
        }
        redirect($manageurl);
        break;

    case 'collmoveup':
        if ($tagcoll) {
            require_sesskey();
            core_tag_collection::change_sortorder($tagcoll, -1);
            redirect($manageurl, get_string('changessaved', 'core_tag'), null, \core\output\notification::NOTIFY_SUCCESS);
        }
        redirect($manageurl);
        break;

    case 'collmovedown':
        if ($tagcoll) {
            require_sesskey();
            core_tag_collection::change_sortorder($tagcoll, 1);
            redirect($manageurl, get_string('changessaved', 'core_tag'), null, \core\output\notification::NOTIFY_SUCCESS);
        }
        redirect($manageurl);
        break;

    case 'delete':
        if ($tagid) {
            require_sesskey();
            core_tag_tag::delete_tags(array($tagid));
            \core\notification::success(get_string('deleted', 'core_tag'));
        }
        redirect($PAGE->url);
        break;

    case 'bulk':
        if (optional_param('bulkdelete', null, PARAM_RAW) !== null) {
            if ($tagschecked) {
                require_sesskey();
                core_tag_tag::delete_tags($tagschecked);
                \core\notification::success(get_string('deleted', 'core_tag'));
            }
            redirect($PAGE->url);
        } else if (optional_param('bulkcombine', null, PARAM_RAW) !== null) {
            $tags = core_tag_tag::get_bulk($tagschecked, '*');
            if (count($tags) > 1) {
                require_sesskey();
                if (($maintag = optional_param('maintag', 0, PARAM_INT)) && array_key_exists($maintag, $tags)) {
                    $tag = $tags[$maintag];
                } else {
                    $tag = array_shift($tags);
                }
                $tag->combine_tags($tags);
                \core\notification::success(get_string('combined', 'core_tag'));
            }
            redirect($PAGE->url);
        }
        break;

    case 'renamecombine':
        // Allows to rename the tag and if the tag with the new name already exists these tags will be combined.
        if ($tagid && ($newname = required_param('newname', PARAM_TAG))) {
            require_sesskey();
            $tag = core_tag_tag::get($tagid, '*', MUST_EXIST);
            $targettag = core_tag_tag::get_by_name($tag->tagcollid, $newname, '*');
            if ($targettag) {
                $targettag->combine_tags(array($tag));
                \core\notification::success(get_string('combined', 'core_tag'));
            } else {
                $tag->update(array('rawname' => $newname));
                \core\notification::success(get_string('changessaved', 'core_tag'));
            }
        }
        redirect($PAGE->url);
        break;

    case 'addstandardtag':
        require_sesskey();
        $tagobjects = array();
        if ($tagcoll) {
            $tagslist = optional_param('tagslist', '', PARAM_RAW);
            $newtags = preg_split('/\s*,\s*/', trim($tagslist), -1, PREG_SPLIT_NO_EMPTY);
            $tagobjects = core_tag_tag::create_if_missing($tagcoll->id, $newtags, true);
        }
        foreach ($tagobjects as $tagobject) {
            if (!$tagobject->isstandard) {
                $tagobject->update(array('isstandard' => 1));
            }
        }
        redirect($PAGE->url, $tagobjects ? get_string('added', 'core_tag') : null,
                null, \core\output\notification::NOTIFY_SUCCESS);
        break;
}

echo $OUTPUT->header();

if (!$tagcoll) {
    // Tag collection is not specified. Display the overview of tag collections and tag areas.
    $tagareastable = new core_tag_areas_table($manageurl);
    $colltable = new core_tag_collections_table($manageurl);

    echo $OUTPUT->heading(get_string('tagcollections', 'core_tag') . $OUTPUT->help_icon('tagcollection', 'tag'), 3);
    echo html_writer::table($colltable);
    $url = new moodle_url($manageurl, array('action' => 'colladd'));
    echo html_writer::div(html_writer::link('#', get_string('addtagcoll', 'tag'), array('data-url' => $url)),
            'mdl-right addtagcoll');

    echo $OUTPUT->heading(get_string('tagareas', 'core_tag'), 3);
    echo html_writer::table($tagareastable);

    $PAGE->requires->js_call_amd('core/tag', 'initManageCollectionsPage', array());

    echo $OUTPUT->footer();
    exit;
}

// Tag collection is specified. Manage tags in this collection.
echo $OUTPUT->heading(core_tag_collection::display_name($tagcoll));

// Form to filter tags.
print('<form class="tag-filter-form" method="get" action="'.$CFG->wwwroot.'/tag/manage.php">');
print('<div class="tag-management-form generalbox"><label class="accesshide" for="id_tagfilter">'. get_string('search') .'</label>'.
    '<input type="hidden" name="tc" value="'.$tagcollid.'" />'.
    '<input type="hidden" name="perpage" value="'.$perpage.'" />'.
    '<input id="id_tagfilter" name="filter" type="text" value="' . s($filter) . '">'.
    '<input value="'. s(get_string('search')) .'" type="submit" class="btn btn-secondary"> '.
    ($filter !== '' ? html_writer::link(new moodle_url($PAGE->url, array('filter' => null)),
        get_string('resetfilter', 'tag'), array('class' => 'resetfilterlink')) : '').
    '</div>');
print('</form>');

// Link to add an standard tags.
$img = $OUTPUT->pix_icon('t/add', '');
echo '<div class="addstandardtags visibleifjs">' .
    html_writer::link('#', $img . get_string('addotags', 'tag'), array('data-action' => 'addstandardtag')) .
    '</div>';

$table = new core_tag_manage_table($tagcollid);
echo '<form class="tag-management-form" method="post" action="'.$CFG->wwwroot.'/tag/manage.php">';
echo html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'tc', 'value' => $tagcollid));
echo html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'sesskey', 'value' => sesskey()));
echo html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'action', 'value' => 'bulk'));
echo html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'perpage', 'value' => $perpage));
echo html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'page', 'value' => $page));
echo $table->out($perpage, true);

if ($table->rawdata) {
    echo html_writer::start_tag('p');
    echo html_writer::tag('button', get_string('deleteselected', 'tag'),
            array('id' => 'tag-management-delete', 'type' => 'submit',
                  'class' => 'tagdeleteselected btn btn-secondary', 'name' => 'bulkdelete'));
    echo html_writer::tag('button', get_string('combineselected', 'tag'),
        array('id' => 'tag-management-combine', 'type' => 'submit',
              'class' => 'tagcombineselected btn btn-secondary', 'name' => 'bulkcombine'));
    echo html_writer::end_tag('p');
}
echo '</form>';

$totalcount = $table->totalcount;
if ($perpage == SHOW_ALL_PAGE_SIZE) {
    echo html_writer::start_tag('div', array('id' => 'showall'));
    $params = array('perpage' => DEFAULT_PAGE_SIZE, 'page' => 0);
    $url = new moodle_url($PAGE->url, $params);
    echo html_writer::link($url, get_string('showperpage', '', DEFAULT_PAGE_SIZE));
    echo html_writer::end_tag('div');
} else if ($totalcount > 0 and $perpage < $totalcount) {
    echo html_writer::start_tag('div', array('id' => 'showall'));
    $params = array('perpage' => SHOW_ALL_PAGE_SIZE, 'page' => 0);
    $url = new moodle_url($PAGE->url, $params);
    echo html_writer::link($url, get_string('showall', '', $totalcount));
    echo html_writer::end_tag('div');
}

echo $OUTPUT->footer();
