<?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/>.

/**
 * Controller for various actions of the block.
 *
 * This page display the community course search form.
 * It also handles adding a course to the community block.
 * It also handles downloading a course template.
 *
 * @package    block_community
 * @author     Jerome Mouneyrac <jerome@mouneyrac.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL
 * @copyright  (C) 1999 onwards Martin Dougiamas  http://dougiamas.com
 */

require('../../config.php');
require_once($CFG->dirroot . '/blocks/community/locallib.php');
require_once($CFG->dirroot . '/blocks/community/forms.php');
require_once($CFG->dirroot . '/' . $CFG->admin . '/registration/lib.php');

require_login();
$courseid = required_param('courseid', PARAM_INT); //if no courseid is given
$parentcourse = $DB->get_record('course', array('id' => $courseid), '*', MUST_EXIST);

$context = context_course::instance($courseid);
$PAGE->set_course($parentcourse);
$PAGE->set_url('/blocks/community/communitycourse.php');
$PAGE->set_heading($SITE->fullname);
$PAGE->set_pagelayout('incourse');
$PAGE->set_title(get_string('searchcourse', 'block_community'));
$PAGE->navbar->add(get_string('searchcourse', 'block_community'));

$search = optional_param('search', null, PARAM_TEXT);

//if no capability to search course, display an error message
$usercansearch = has_capability('moodle/community:add', $context);
$usercandownload = has_capability('moodle/community:download', $context);
if (empty($usercansearch)) {
    $notificationerror = get_string('cannotsearchcommunity', 'hub');
} else if (!extension_loaded('xmlrpc')) {
    $notificationerror = $OUTPUT->doc_link('admin/environment/php_extension/xmlrpc', '');
    $notificationerror .= get_string('xmlrpcdisabledcommunity', 'hub');
}
if (!empty($notificationerror)) {
    echo $OUTPUT->header();
    echo $OUTPUT->heading(get_string('searchcommunitycourse', 'block_community'), 3, 'main');
    echo $OUTPUT->notification($notificationerror);
    echo $OUTPUT->footer();
    die();
}

$communitymanager = new block_community_manager();
$renderer = $PAGE->get_renderer('block_community');

/// Check if the page has been called with trust argument
$add = optional_param('add', -1, PARAM_INT);
$confirm = optional_param('confirmed', false, PARAM_INT);
if ($add != -1 and $confirm and confirm_sesskey()) {
    $course = new stdClass();
    $course->name = optional_param('coursefullname', '', PARAM_TEXT);
    $course->description = optional_param('coursedescription', '', PARAM_TEXT);
    $course->url = optional_param('courseurl', '', PARAM_URL);
    $course->imageurl = optional_param('courseimageurl', '', PARAM_URL);
    $communitymanager->block_community_add_course($course, $USER->id);
    echo $OUTPUT->header();
    echo $renderer->save_link_success(
            new moodle_url('/course/view.php', array('id' => $courseid)));
    echo $OUTPUT->footer();
    die();
}

/// Delete temp file when cancel restore
$cancelrestore = optional_param('cancelrestore', false, PARAM_INT);
if ($usercandownload and $cancelrestore and confirm_sesskey()) {
    $filename = optional_param('filename', '', PARAM_ALPHANUMEXT);
    //delete temp file
    unlink($CFG->tempdir . '/backup/' . $filename . ".mbz");
}

/// Download
$huburl = optional_param('huburl', false, PARAM_URL);
$download = optional_param('download', -1, PARAM_INT);
$downloadcourseid = optional_param('downloadcourseid', '', PARAM_INT);
$coursefullname = optional_param('coursefullname', '', PARAM_ALPHANUMEXT);
$backupsize = optional_param('backupsize', 0, PARAM_INT);
if ($usercandownload and $download != -1 and !empty($downloadcourseid) and confirm_sesskey()) {
    $course = new stdClass();
    $course->fullname = $coursefullname;
    $course->id = $downloadcourseid;
    $course->huburl = $huburl;

    //OUTPUT: display restore choice page
    echo $OUTPUT->header();
    echo $OUTPUT->heading(get_string('downloadingcourse', 'block_community'), 3, 'main');
    $sizeinfo = new stdClass();
    $sizeinfo->total = number_format($backupsize / 1000000, 2);
    echo html_writer::tag('div', get_string('downloadingsize', 'block_community', $sizeinfo),
            array('class' => 'textinfo'));
    if (ob_get_level()) {
        ob_flush();
    }
    flush();
    $filenames = $communitymanager->block_community_download_course_backup($course);
    echo html_writer::tag('div', get_string('downloaded', 'block_community'),
            array('class' => 'textinfo'));
    echo $OUTPUT->notification(get_string('downloadconfirmed', 'block_community',
                    '/downloaded_backup/' . $filenames['privatefile']), 'notifysuccess');
    echo $renderer->restore_confirmation_box($filenames['tmpfile'], $context);
    echo $OUTPUT->footer();
    die();
}

/// Remove community
$remove = optional_param('remove', '', PARAM_INT);
$communityid = optional_param('communityid', '', PARAM_INT);
if ($remove != -1 and !empty($communityid) and confirm_sesskey()) {
    $communitymanager->block_community_remove_course($communityid, $USER->id);
    echo $OUTPUT->header();
    echo $renderer->remove_success(new moodle_url('/course/view.php', array('id' => $courseid)));
    echo $OUTPUT->footer();
    die();
}

//Get form default/current values
$fromformdata['coverage'] = optional_param('coverage', 'all', PARAM_TEXT);
$fromformdata['licence'] = optional_param('licence', 'all', PARAM_ALPHANUMEXT);
$fromformdata['subject'] = optional_param('subject', 'all', PARAM_ALPHANUMEXT);
$fromformdata['audience'] = optional_param('audience', 'all', PARAM_ALPHANUMEXT);
$fromformdata['language'] = optional_param('language', current_language(), PARAM_ALPHANUMEXT);
$fromformdata['educationallevel'] = optional_param('educationallevel', 'all', PARAM_ALPHANUMEXT);
$fromformdata['downloadable'] = optional_param('downloadable', $usercandownload, PARAM_ALPHANUM);
$fromformdata['orderby'] = optional_param('orderby', 'newest', PARAM_ALPHA);
$fromformdata['huburl'] = optional_param('huburl', HUB_MOODLEORGHUBURL, PARAM_URL);
$fromformdata['search'] = $search;
$fromformdata['courseid'] = $courseid;
$hubselectorform = new community_hub_search_form('', $fromformdata);
$hubselectorform->set_data($fromformdata);

//Retrieve courses by web service
$courses = null;
if (optional_param('executesearch', 0, PARAM_INT) and confirm_sesskey()) {
    $downloadable = optional_param('downloadable', false, PARAM_INT);

    $options = new stdClass();
    if (!empty($fromformdata['coverage'])) {
        $options->coverage = $fromformdata['coverage'];
    }
    if ($fromformdata['licence'] != 'all') {
        $options->licenceshortname = $fromformdata['licence'];
    }
    if ($fromformdata['subject'] != 'all') {
        $options->subject = $fromformdata['subject'];
    }
    if ($fromformdata['audience'] != 'all') {
        $options->audience = $fromformdata['audience'];
    }
    if ($fromformdata['educationallevel'] != 'all') {
        $options->educationallevel = $fromformdata['educationallevel'];
    }
    if ($fromformdata['language'] != 'all') {
        $options->language = $fromformdata['language'];
    }

    $options->orderby = $fromformdata['orderby'];

    //the range of course requested
    $options->givememore = optional_param('givememore', 0, PARAM_INT);

    //check if the selected hub is from the registered list (in this case we use the private token)
    $token = 'publichub';
    $registrationmanager = new registration_manager();
    $registeredhubs = $registrationmanager->get_registered_on_hubs();
    foreach ($registeredhubs as $registeredhub) {
        if ($huburl == $registeredhub->huburl) {
            $token = $registeredhub->token;
        }
    }

    $function = 'hub_get_courses';
    $params = array('search' => $search, 'downloadable' => $downloadable,
        'enrollable' => !$downloadable, 'options' => $options);
    $serverurl = $huburl . "/local/hub/webservice/webservices.php";
    require_once($CFG->dirroot . "/webservice/xmlrpc/lib.php");
    $xmlrpcclient = new webservice_xmlrpc_client($serverurl, $token);
    try {
        $result = $xmlrpcclient->call($function, $params);
        $courses = $result['courses'];
        $coursetotal = $result['coursetotal'];
    } catch (Exception $e) {
        $errormessage = $OUTPUT->notification(
                        get_string('errorcourselisting', 'block_community', $e->getMessage()));
    }
}

// OUTPUT
echo $OUTPUT->header();
echo $OUTPUT->heading(get_string('searchcommunitycourse', 'block_community'), 3, 'main');
$hubselectorform->display();
if (!empty($errormessage)) {
    echo $errormessage;
}

//load javascript
$commentedcourseids = array(); //result courses with comments only
$courseids = array(); //all result courses
$courseimagenumbers = array(); //number of screenshots of all courses (must be exact same order than $courseids)
if (!empty($courses)) {
    foreach ($courses as $course) {
        if (!empty($course['comments'])) {
            $commentedcourseids[] = $course['id'];
        }
        $courseids[] = $course['id'];
        $courseimagenumbers[] = $course['screenshots'];
    }
}
$PAGE->requires->yui_module('moodle-block_community-comments', 'M.blocks_community.init_comments',
        array(array('commentids' => $commentedcourseids, 'closeButtonTitle' => get_string('close', 'editor'))));
$PAGE->requires->yui_module('moodle-block_community-imagegallery', 'M.blocks_community.init_imagegallery',
        array(array('imageids' => $courseids, 'imagenumbers' => $courseimagenumbers,
                'huburl' => $huburl, 'closeButtonTitle' => get_string('close', 'editor'))));

echo highlight($search, $renderer->course_list($courses, $huburl, $courseid));

//display givememore/Next link if more course can be displayed
if (!empty($courses)) {
    if (($options->givememore + count($courses)) < $coursetotal) {
        $fromformdata['givememore'] = count($courses) + $options->givememore;
        $fromformdata['executesearch'] = true;
        $fromformdata['sesskey'] = sesskey();
        echo $renderer->next_button($fromformdata);
    }
}

echo $OUTPUT->footer();