<?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/>.

/**
 * This file contains backup and restore output renderers
 *
 * @package   moodlecore
 * @copyright 2010 Sam Hemelryk
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

/**
 * The primary renderer for the backup.
 *
 * Can be retrieved with the following code:
 * <?php
 * $renderer = $PAGE->get_renderer('core','backup');
 * ?>
 *
 * @copyright 2010 Sam Hemelryk
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class core_backup_renderer extends plugin_renderer_base {
    /**
     * Renderers a progress bar for the backup or restore given the items that
     * make it up.
     * @param array $items An array of items
     * @return string
     */
    public function progress_bar(array $items) {
        foreach ($items as &$item) {
            $text = $item['text'];
            unset($item['text']);
            if (array_key_exists('link', $item)) {
                $link = $item['link'];
                unset($item['link']);
                $item = html_writer::link($link, $text, $item);
            } else {
                $item = html_writer::tag('span', $text, $item);
            }
        }
        return html_writer::tag('div', join(get_separator(), $items), array('class'=>'backup_progress clearfix'));
    }
    /**
     * Prints a dependency notification
     * @param string $message
     * @return string
     */
    public function dependency_notification($message) {
        return html_writer::tag('div', $message, array('class'=>'notification dependencies_enforced'));
    }

    /**
     * Displays the details of a backup file
     *
     * @param stdClass $details
     * @param moodle_url $nextstageurl
     * @return string
     */
    public function backup_details($details, $nextstageurl) {
        $yestick = $this->output->pix_icon('i/tick_green_big', get_string('yes'));
        $notick = $this->output->pix_icon('i/cross_red_big', get_string('no'));

        $html  = html_writer::start_tag('div', array('class'=>'backup-restore'));

        $html .= html_writer::start_tag('div', array('class'=>'backup-section'));
        $html .= $this->output->heading(get_string('backupdetails', 'backup'), 2, array('class'=>'header'));
        $html .= $this->backup_detail_pair(get_string('backuptype', 'backup'), get_string('backuptype'.$details->type, 'backup'));
        $html .= $this->backup_detail_pair(get_string('backupformat', 'backup'), get_string('backupformat'.$details->format, 'backup'));
        $html .= $this->backup_detail_pair(get_string('backupmode', 'backup'), get_string('backupmode'.$details->mode, 'backup'));
        $html .= $this->backup_detail_pair(get_string('backupdate', 'backup'), userdate($details->backup_date));
        $html .= $this->backup_detail_pair(get_string('moodleversion', 'backup'),
                html_writer::tag('span', $details->moodle_release, array('class'=>'moodle_release')).
                html_writer::tag('span', '['.$details->moodle_version.']', array('class'=>'moodle_version sub-detail')));
        $html .= $this->backup_detail_pair(get_string('backupversion', 'backup'),
                html_writer::tag('span', $details->backup_release, array('class'=>'moodle_release')).
                html_writer::tag('span', '['.$details->backup_version.']', array('class'=>'moodle_version sub-detail')));
        $html .= $this->backup_detail_pair(get_string('originalwwwroot', 'backup'),
                html_writer::tag('span', $details->original_wwwroot, array('class'=>'originalwwwroot')).
                html_writer::tag('span', '['.$details->original_site_identifier_hash.']', array('class'=>'sitehash sub-detail')));
        $html .= html_writer::end_tag('div');

        $html .= html_writer::start_tag('div', array('class'=>'backup-section settings-section'));
        $html .= $this->output->heading(get_string('backupsettings', 'backup'), 2, array('class'=>'header'));
        foreach ($details->root_settings as $label=>$value) {
            if ($label == 'filename' or $label == 'user_files') {
                continue;
            }
            $html .= $this->backup_detail_pair(get_string('rootsetting'.str_replace('_','',$label), 'backup'), $value?$yestick:$notick);
        }
        $html .= html_writer::end_tag('div');

        if ($details->type === 'course') {
            $html .= html_writer::start_tag('div', array('class'=>'backup-section'));
            $html .= $this->output->heading(get_string('backupcoursedetails', 'backup'), 2, array('class'=>'header'));
            $html .= $this->backup_detail_pair(get_string('coursetitle', 'backup'), $details->course->title);
            $html .= $this->backup_detail_pair(get_string('courseid', 'backup'), $details->course->courseid);

            $html .= html_writer::start_tag('div', array('class'=>'backup-sub-section'));
            $html .= $this->output->heading(get_string('backupcoursesections', 'backup'), 3, array('class'=>'subheader'));
            foreach ($details->sections as $key=>$section) {
                $included = $key.'_included';
                $userinfo = $key.'_userinfo';
                if ($section->settings[$included] && $section->settings[$userinfo]) {
                    $value = get_string('sectionincanduser','backup');
                } else if ($section->settings[$included]) {
                    $value = get_string('sectioninc','backup');
                } else {
                    continue;
                }
                $html .= $this->backup_detail_pair(get_string('backupcoursesection', 'backup', $section->title), $value);
                $table = null;
                foreach ($details->activities as $activitykey=>$activity) {
                    if ($activity->sectionid != $section->sectionid) {
                        continue;
                    }
                    if (empty($table)) {
                        $table = new html_table();
                        $table->head = array('Module', 'Title', 'Userinfo');
                        $table->colclasses = array('modulename', 'moduletitle', 'userinfoincluded');
                        $table->align = array('left','left', 'center');
                        $table->attributes = array('class'=>'activitytable generaltable');
                        $table->data = array();
                    }
                    $name = get_string('pluginname', $activity->modulename);
                    $icon = new pix_icon('icon', $name, $activity->modulename);
                    $table->data[] = array(
                        $this->output->render($icon).'&nbsp;'.$name,
                        $activity->title,
                        ($activity->settings[$activitykey.'_userinfo'])?$yestick:$notick,
                    );
                }
                if (!empty($table)) {
                    $html .= $this->backup_detail_pair(get_string('sectionactivities','backup'), html_writer::table($table));
                }

            }
            $html .= html_writer::end_tag('div');
            $html .= html_writer::end_tag('div');
        }

        $html .= $this->output->single_button($nextstageurl, get_string('continue'), 'post');
        $html .= html_writer::end_tag('div');

        return $html;
    }

    /**
     * Displays a course selector for restore
     *
     * @param moodle_url $nextstageurl
     * @param stdClass $details
     * @param restore_category_search $categories
     * @param restore_course_search $courses
     * @param int $currentcourse
     * @return string
     */
    public function course_selector(moodle_url $nextstageurl, $details, restore_category_search $categories = null, restore_course_search $courses=null, $currentcourse = null) {
        global $CFG;
        require_once($CFG->dirroot.'/course/lib.php');

        $nextstageurl->param('sesskey', sesskey());

        $form = html_writer::start_tag('form', array('method'=>'post', 'action'=>$nextstageurl->out_omit_querystring()));
        foreach ($nextstageurl->params() as $key=>$value) {
            $form .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>$key, 'value'=>$value));
        }

        $hasrestoreoption = false;

        $html  = html_writer::start_tag('div', array('class'=>'backup-course-selector backup-restore'));
        if ($details->type == backup::TYPE_1COURSE && !empty($categories) && ($categories->get_count() > 0 || $categories->get_search())) {
            // New course
            $hasrestoreoption = true;
            $html .= $form;
            $html .= html_writer::start_tag('div', array('class'=>'bcs-new-course backup-section'));
            $html .= $this->output->heading(get_string('restoretonewcourse', 'backup'), 2, array('class'=>'header'));
            $html .= $this->backup_detail_input(get_string('restoretonewcourse', 'backup'), 'radio', 'target', backup::TARGET_NEW_COURSE, array('checked'=>'checked'));
            $html .= $this->backup_detail_pair(get_string('selectacategory', 'backup'), $this->render($categories));
            $html .= $this->backup_detail_pair('', html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('continue'))));
            $html .= html_writer::end_tag('div');
            $html .= html_writer::end_tag('form');
        }

        if ($details->type == backup::TYPE_1COURSE && !empty($currentcourse)) {
            // Current course
            $hasrestoreoption = true;
            $html .= $form;
            $html .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'targetid', 'value'=>$currentcourse));
            $html .= html_writer::start_tag('div', array('class'=>'bcs-current-course backup-section'));
            $html .= $this->output->heading(get_string('restoretocurrentcourse', 'backup'), 2, array('class'=>'header'));
            $html .= $this->backup_detail_input(get_string('restoretocurrentcourseadding', 'backup'), 'radio', 'target', backup::TARGET_CURRENT_ADDING, array('checked'=>'checked'));
            $html .= $this->backup_detail_input(get_string('restoretocurrentcoursedeleting', 'backup'), 'radio', 'target', backup::TARGET_CURRENT_DELETING);
            $html .= $this->backup_detail_pair('', html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('continue'))));
            $html .= html_writer::end_tag('div');
            $html .= html_writer::end_tag('form');
        }

        if (!empty($courses) && ($courses->get_count() > 0 || $courses->get_search())) {
            // Existing course
            $hasrestoreoption = true;
            $html .= $form;
            $html .= html_writer::start_tag('div', array('class'=>'bcs-existing-course backup-section'));
            $html .= $this->output->heading(get_string('restoretoexistingcourse', 'backup'), 2, array('class'=>'header'));
            if ($details->type == backup::TYPE_1COURSE) {
                $html .= $this->backup_detail_input(get_string('restoretoexistingcourseadding', 'backup'), 'radio', 'target', backup::TARGET_EXISTING_ADDING, array('checked'=>'checked'));
                $html .= $this->backup_detail_input(get_string('restoretoexistingcoursedeleting', 'backup'), 'radio', 'target', backup::TARGET_EXISTING_DELETING);
                $html .= $this->backup_detail_pair(get_string('selectacourse', 'backup'), $this->render($courses));
            } else {
                // We only allow restore adding to existing for now. Enforce it here.
                $html .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'target', 'value'=>backup::TARGET_EXISTING_ADDING));
                $courses->invalidate_results(); // Clean list of courses
                $courses->set_include_currentcourse(); // Show current course in the list
                $html .= $this->backup_detail_pair(get_string('selectacourse', 'backup'), $this->render($courses));
            }
            $html .= $this->backup_detail_pair('', html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('continue'))));
            $html .= html_writer::end_tag('div');
            $html .= html_writer::end_tag('form');
        }

        if (!$hasrestoreoption) {
            echo $this->output->notification(get_string('norestoreoptions','backup'));
        }

        $html .= html_writer::end_tag('div');
        return $html;
    }

    /**
     * Displays the import course selector
     *
     * @param moodle_url $nextstageurl
     * @param import_course_search $courses
     * @return string
     */
    public function import_course_selector(moodle_url $nextstageurl, import_course_search $courses=null) {
        $html  = html_writer::start_tag('div', array('class'=>'import-course-selector backup-restore'));
        $html .= html_writer::start_tag('form', array('method'=>'post', 'action'=>$nextstageurl->out_omit_querystring()));
        foreach ($nextstageurl->params() as $key=>$value) {
            $html .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>$key, 'value'=>$value));
        }
        // We only allow import adding for now. Enforce it here.
        $html .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'target', 'value'=>backup::TARGET_CURRENT_ADDING));
        $html .= html_writer::start_tag('div', array('class'=>'ics-existing-course backup-section'));
        $html .= $this->output->heading(get_string('importdatafrom'), 2, array('class'=>'header'));
        $html .= $this->backup_detail_pair(get_string('selectacourse', 'backup'), $this->render($courses));
        $html .= $this->backup_detail_pair('', html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('continue'))));
        $html .= html_writer::end_tag('div');
        $html .= html_writer::end_tag('form');
        $html .= html_writer::end_tag('div');
        return $html;
    }

    /**
     * Creates a detailed pairing (key + value)
     *
     * @staticvar int $count
     * @param string $label
     * @param string $value
     * @return string
     */
    protected function backup_detail_pair($label, $value) {
        static $count= 0;
        $count++;
        $html  = html_writer::start_tag('div', array('class'=>'detail-pair'));
        $html .= html_writer::tag('label', $label, array('class'=>'detail-pair-label', 'for'=>'detail-pair-value-'.$count));
        $html .= html_writer::tag('div', $value, array('class'=>'detail-pair-value', 'name'=>'detail-pair-value-'.$count));
        $html .= html_writer::end_tag('div');
        return $html;
    }

    /**
     * Created a detailed pairing with an input
     *
     * @param string $label
     * @param string $type
     * @param string $name
     * @param string $value
     * @param array $attributes
     * @param string|null $description
     * @return string
     */
    protected function backup_detail_input($label, $type, $name, $value, array $attributes=array(), $description=null) {
        if (!empty ($description)) {
            $description = html_writer::tag('span', $description, array('class'=>'description'));
        } else {
            $description = '';
        }
        return $this->backup_detail_pair($label, html_writer::empty_tag('input', $attributes+array('name'=>$name, 'type'=>$type, 'value'=>$value)).$description);
    }

    /**
     * Creates a detailed pairing with a select
     *
     * @param string $label
     * @param string $name
     * @param array $options
     * @param string $selected
     * @param bool $nothing
     * @param array $attributes
     * @param string|null $description
     * @return string
     */
    protected function backup_detail_select($label, $name, $options, $selected='', $nothing=false, array $attributes=array(), $description=null) {
        if (!empty ($description)) {
            $description = html_writer::tag('span', $description, array('class'=>'description'));
        } else {
            $description = '';
        }
        return $this->backup_detail_pair($label, html_writer::select($options, $name, $selected, false, $attributes).$description);
    }

    /**
     * Displays precheck notices
     *
     * @param array $results
     * @return string
     */
    public function precheck_notices($results) {
        $output = html_writer::start_tag('div', array('class'=>'restore-precheck-notices'));
        if (array_key_exists('errors', $results)) {
            foreach ($results['errors'] as $error) {
                $output .= $this->output->notification($error);
            }
        }
        if (array_key_exists('warnings', $results)) {
            foreach ($results['warnings'] as $warning) {
                $output .= $this->output->notification($warning, 'notifywarning notifyproblem');
            }
        }
        return $output.html_writer::end_tag('div');
    }

    /**
     * Displays substage buttons
     *
     * @param bool $haserrors
     * @return string
     */
    public function substage_buttons($haserrors) {
        $output  = html_writer::start_tag('div', array('continuebutton'));
        if (!$haserrors) {
            $output .= html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('continue')));
        }
        $output .= html_writer::empty_tag('input', array('type'=>'submit', 'name'=>'cancel', 'value'=>get_string('cancel')));
        $output .= html_writer::end_tag('div');
        return $output;
    }

    /**
     * Displays a role mapping interface
     *
     * @param array $rolemappings
     * @param array $roles
     * @return string
     */
    public function role_mappings($rolemappings, $roles) {
        $roles[0] = get_string('none');
        $output  = html_writer::start_tag('div', array('class'=>'restore-rolemappings'));
        $output .= $this->output->heading(get_string('restorerolemappings', 'backup'), 2);
        foreach ($rolemappings as $id=>$mapping) {
            $label = $mapping->name;
            $name = 'mapping'.$id;
            $selected = $mapping->targetroleid;
            $output .= $this->backup_detail_select($label, $name, $roles, $mapping->targetroleid, false, array(), $mapping->description);
        }
        $output .= html_writer::end_tag('div');
        return $output;
    }

    /**
     * Displays a continue button
     *
     * @param string|moodle_url $url
     * @param string $method
     * @return string
     */
    public function continue_button($url, $method='post') {
        if (!($url instanceof moodle_url)) {
            $url = new moodle_url($url);
        }
        if ($method != 'post') {
            $method = 'get';
        }
        $url->param('sesskey', sesskey());
        $button = new single_button($url, get_string('continue'), $method);
        $button->class = 'continuebutton';
        return $this->render($button);
    }
    /**
     * Print a backup files tree
     * @param array $options
     * @return string
     */
    public function backup_files_viewer(array $options = null) {
        $files = new backup_files_viewer($options);
        return $this->render($files);
    }

    /**
     * Displays a backup files viewer
     *
     * @global stdClass $USER
     * @param backup_files_viewer $tree
     * @return string
     */
    public function render_backup_files_viewer(backup_files_viewer $viewer) {
        global $CFG;
        $files = $viewer->files;

        $table = new html_table();
        $table->attributes['class'] = 'backup-files-table generaltable';
        $table->head = array(get_string('filename', 'backup'), get_string('time'), get_string('size'), get_string('download'), get_string('restore'));
        $table->width = '100%';
        $table->data = array();

        foreach ($files as $file) {
            if ($file->is_directory()) {
                continue;
            }
            $fileurl = moodle_url::make_pluginfile_url($file->get_contextid(), $file->get_component(), $file->get_filearea(), null, $file->get_filepath(), $file->get_filename(), true);
            $params = array();
            $params['action'] = 'choosebackupfile';
            $params['filename'] = $file->get_filename();
            $params['filepath'] = $file->get_filepath();
            $params['component'] = $file->get_component();
            $params['filearea'] = $file->get_filearea();
            $params['filecontextid'] = $file->get_contextid();
            $params['contextid'] = $viewer->currentcontext->id;
            $params['itemid'] = $file->get_itemid();
            $restoreurl = new moodle_url('/backup/restorefile.php', $params);
            $table->data[] = array(
                $file->get_filename(),
                userdate($file->get_timemodified()),
                display_size($file->get_filesize()),
                html_writer::link($fileurl, get_string('download')),
                html_writer::link($restoreurl, get_string('restore')),
                );
        }

        $html = html_writer::table($table);
        $html .= $this->output->single_button(new moodle_url('/backup/backupfilesedit.php', array('currentcontext'=>$viewer->currentcontext->id, 'contextid'=>$viewer->filecontext->id, 'filearea'=>$viewer->filearea, 'component'=>$viewer->component, 'returnurl'=>$this->page->url->out())), get_string('managefiles', 'backup'), 'post');

        return $html;
    }

    /**
     * Renders a restore course search object
     *
     * @param restore_course_search $component
     * @return string
     */
    public function render_restore_course_search(restore_course_search $component) {
        $url = $component->get_url();

        $output = html_writer::start_tag('div', array('class' => 'restore-course-search'));
        $output .= html_writer::start_tag('div', array('class' => 'rcs-results'));

        $table = new html_table();
        $table->head = array('', get_string('shortnamecourse'), get_string('fullnamecourse'));
        $table->data = array();
        if ($component->get_count() !== 0) {
            foreach ($component->get_results() as $course) {
                $row = new html_table_row();
                $row->attributes['class'] = 'rcs-course';
                if (!$course->visible) {
                    $row->attributes['class'] .= ' dimmed';
                }
                $row->cells = array(
                    html_writer::empty_tag('input', array('type'=>'radio', 'name'=>'targetid', 'value'=>$course->id)),
                    $course->shortname,
                    $course->fullname
                );
                $table->data[] = $row;
            }
            if ($component->has_more_results()) {
                $cell = new html_table_cell(get_string('moreresults', 'backup'));
                $cell->colspan = 3;
                $cell->attributes['class'] = 'notifyproblem';
                $row = new html_table_row(array($cell));
                $row->attributes['class'] = 'rcs-course';
                $table->data[] = $row;
            }
        } else {
            $cell = new html_table_cell(get_string('nomatchingcourses', 'backup'));
            $cell->colspan = 3;
            $cell->attributes['class'] = 'notifyproblem';
            $row = new html_table_row(array($cell));
            $row->attributes['class'] = 'rcs-course';
            $table->data[] = $row;
        }
        $output .= html_writer::table($table);
        $output .= html_writer::end_tag('div');

        $output .= html_writer::start_tag('div', array('class'=>'rcs-search'));
        $output .= html_writer::empty_tag('input', array('type'=>'text', 'name'=>restore_course_search::$VAR_SEARCH, 'value'=>$component->get_search()));
        $output .= html_writer::empty_tag('input', array('type'=>'submit', 'name'=>'searchcourses', 'value'=>get_string('search')));
        $output .= html_writer::end_tag('div');

        $output .= html_writer::end_tag('div');
        return $output;
    }

    /**
     * Renders an import course search object
     *
     * @param import_course_search $component
     * @return string
     */
    public function render_import_course_search(import_course_search $component) {
        $url = $component->get_url();

        $output = html_writer::start_tag('div', array('class' => 'import-course-search'));
        if ($component->get_count() === 0) {
            $output .= $this->output->notification(get_string('nomatchingcourses', 'backup'));
            $output .= html_writer::end_tag('div');
            return $output;
        }

        $output .= html_writer::tag('div', get_string('totalcoursesearchresults', 'backup', $component->get_count()), array('class'=>'ics-totalresults'));

        $output .= html_writer::start_tag('div', array('class' => 'ics-results'));

        $table = new html_table();
        $table->head = array('', get_string('shortnamecourse'), get_string('fullnamecourse'));
        $table->data = array();
        foreach ($component->get_results() as $course) {
            $row = new html_table_row();
            $row->attributes['class'] = 'ics-course';
            if (!$course->visible) {
                $row->attributes['class'] .= ' dimmed';
            }
            $row->cells = array(
                html_writer::empty_tag('input', array('type'=>'radio', 'name'=>'importid', 'value'=>$course->id)),
                $course->shortname,
                $course->fullname
            );
            $table->data[] = $row;
        }
        $output .= html_writer::table($table);
        $output .= html_writer::end_tag('div');

        $output .= html_writer::start_tag('div', array('class'=>'ics-search'));
        $output .= html_writer::empty_tag('input', array('type'=>'text', 'name'=>restore_course_search::$VAR_SEARCH, 'value'=>$component->get_search()));
        $output .= html_writer::empty_tag('input', array('type'=>'submit', 'name'=>'searchcourses', 'value'=>get_string('search')));
        $output .= html_writer::end_tag('div');

        $output .= html_writer::end_tag('div');
        return $output;
    }

    /**
     * Renders a restore category search object
     *
     * @param restore_category_search $component
     * @return string
     */
    public function render_restore_category_search(restore_category_search $component) {
        $url = $component->get_url();

        $output = html_writer::start_tag('div', array('class' => 'restore-course-search'));
        $output .= html_writer::start_tag('div', array('class' => 'rcs-results'));

        $table = new html_table();
        $table->head = array('', get_string('name'), get_string('description'));
        $table->data = array();

        if ($component->get_count() !== 0) {
            foreach ($component->get_results() as $category) {
                $row = new html_table_row();
                $row->attributes['class'] = 'rcs-course';
                if (!$category->visible) {
                    $row->attributes['class'] .= ' dimmed';
                }
                $row->cells = array(
                    html_writer::empty_tag('input', array('type'=>'radio', 'name'=>'targetid', 'value'=>$category->id)),
                    $category->name,
                    format_text($category->description, $category->descriptionformat, array('overflowdiv'=>true))
                );
                $table->data[] = $row;
            }
            if ($component->has_more_results()) {
                $cell = new html_table_cell(get_string('moreresults', 'backup'));
                $cell->attributes['class'] = 'notifyproblem';
                $cell->colspan = 3;
                $row = new html_table_row(array($cell));
                $row->attributes['class'] = 'rcs-course';
                $table->data[] = $row;
            }
        } else {
            $cell = new html_table_cell(get_string('nomatchingcourses', 'backup'));
            $cell->colspan = 3;
            $cell->attributes['class'] = 'notifyproblem';
            $row = new html_table_row(array($cell));
            $row->attributes['class'] = 'rcs-course';
            $table->data[] = $row;
        }
        $output .= html_writer::table($table);
        $output .= html_writer::end_tag('div');

        $output .= html_writer::start_tag('div', array('class'=>'rcs-search'));
        $output .= html_writer::empty_tag('input', array('type'=>'text', 'name'=>restore_category_search::$VAR_SEARCH, 'value'=>$component->get_search()));
        $output .= html_writer::empty_tag('input', array('type'=>'submit', 'name'=>'searchcourses', 'value'=>get_string('search')));
        $output .= html_writer::end_tag('div');

        $output .= html_writer::end_tag('div');
        return $output;
    }

    public function invalid_format($format) {
        $html  = html_writer::start_tag('div', array('class'=>'invalidformat'));
        $html .= html_writer::tag('h2', get_string('errorinvalidformat', 'backup'), array('class'=>'notifyproblem'));
        if ($format == 'moodle1') {
            // Moodle 1.x backups
            $icon = $this->output->help_icon('errormoodle1format', 'backup');
            $message = get_string('errormoodle1formatdesc', 'backup').' '.$icon;
            
        } else {
            // Totally unknown format
            $message = get_string('errorinvalidformatdesc', 'backup');
        }
        $html .= html_writer::tag('div', $message, array('class'=>'notifyproblem'));
        $html .= html_writer::end_tag('div');
        return $html;
    }
}

/**
 * Data structure representing backup files viewer
 *
 * @copyright 2010 Dongsheng Cai
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @since     Moodle 2.0
 */
class backup_files_viewer implements renderable {
    public $files;
    public $filecontext;
    public $component;
    public $filearea;
    public $currentcontext;

    /**
     * Constructor of backup_files_viewer class
     * @param array $options
     */
    public function __construct(array $options = null) {
        global $CFG, $USER;
        $fs = get_file_storage();
        $this->currentcontext = $options['currentcontext'];
        $this->filecontext    = $options['filecontext'];
        $this->component      = $options['component'];
        $this->filearea       = $options['filearea'];
        $files = $fs->get_area_files($this->filecontext->id, $this->component, $this->filearea, false, 'timecreated');
        $this->files = array_reverse($files);
    }
}