<?php
/**
 * Simple Content Module von Stud.IP
 *
 * This program 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 2 of
 * the License, or (at your option) any later version.
 *
 * @author   Jan-Hendrik Willms <tleilax+studip@gmail.com>
 * @author   André Noack <anoack@mcis.de>
 * @author   Cornelis Kater <ckater@gwdg.de>
 * @author   Stefan Suchi <suchi@gmx.de>
 * @author   Tobias Thelen <tthelen@uni-osnabrueck.de>
 * @license  http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
 * @category Stud.IP
 * @since    2.5
 */

class Course_ScmController extends AuthenticatedController
{
    protected $allow_nobody = true;
    protected $_autobind = true;

    /**
     * Sets the page title. Page title always includes the course name.
     *
     * @param mixed $title Title of the page (optional)
     */
    private function set_title($title = '')
    {
        $title_parts   = func_get_args();
        $title_parts[] = Context::getHeaderLine();
        $page_title    = implode(' - ', $title_parts);

        PageLayout::setTitle($page_title);
    }

    /**
     * Before filter, set up the page by initializing the session and checking
     * all conditions.
     *
     * @param String $action Name of the action to be invoked
     * @param Array  $args   Arguments to be passed to the action method
     */
    public function before_filter(&$action, &$args)
    {
        parent::before_filter($action, $args);

        if (!Config::Get()->SCM_ENABLE) {
            throw new AccessDeniedException(_('Die freien Informationsseiten sind nicht aktiviert.'));
        }

        checkObject();

        $this->priviledged = $GLOBALS['perm']->have_studip_perm('tutor', Context::getId());

        if (!in_array($action, words('index create edit move delete'))) {
            array_unshift($args, $action);
            $action = 'index';
        }

        if (in_array($action, words('create edit move delete')) && !$this->priviledged) {
            throw new AccessDeniedException();
        }

        if ($GLOBALS['perm']->have_studip_perm('tutor', Context::getId())) {
            $widget = Sidebar::get()->addWidget(new ActionsWidget());
            $widget->addLink(
                _('Neuen Eintrag anlegen'),
                $this->createURL(),
                Icon::create('add')
            )->asDialog();
        }

        Navigation::activateItem('/course/scm');

        checkObject(); // do we have an open object?
        checkObjectModule('scm');
        object_set_visit_module('scm');
    }

    /**
     * Displays a page.
     *
     * @param mixed $id Id of the page to display, optional - defaults to
     *                  first page in set.
     */
    public function index_action($id = null)
    {
        $temp       = StudipScmEntry::findByRange_id(Context::getId(), 'ORDER BY position ASC');
        $this->scms = SimpleORMapCollection::createFromArray($temp);
        $this->scm  = $id ? $this->scms->find($id) : $this->scms->first();

        if (!$this->scm && $this->scms->count() > 0) {
            throw new Trails\Exception(404, _('Es konnte keine freie Informationsseite mit der angegebenen Id gefunden werden.'));
        }

        if (Request::get('verify') === 'delete') {
            PageLayout::postQuestion(
                _('Wollen Sie diese Seite wirklich löschen?'),
                $this->url_for("course/scm/delete/{$this->scm->id}")
            )->includeTicket('studip_ticket');
        }

        if (isset($this->scm)) {
            $this->set_title($this->scm->tab_name);
            Navigation::activateItem('/course/scm/' . $this->scm->id);
        } else {
            $this->set_title(_('Informationen'));
            Navigation::activateItem('/course/scm');
        }
    }

    /**
     * Create a page, more or less an alias for the edit action.
     */
    public function create_action()
    {
        $this->scm = new StudipScmEntry();
        $this->scm->user_id = $GLOBALS['user']->id;
        $this->scm->chdate  = time();

        $this->first_entry = StudipScmEntry::countBySql('range_id = ?', [Context::getId()]) === 0;

        $this->set_title(_('Neue Informationsseite anlegen'));

        $this->render_action('edit');
    }

    /**
     * Edits or creates a page.
     *
     * @param mixed $id Id of the page to edit; a new page will be created if
     *                  this parameter is omitted.
     */
    public function edit_action(StudipScmEntry $scm = null)
    {
        if (Request::submitted('submit')) {
            CSRFProtection::verifyUnsafeRequest();

            $scm->tab_name = Request::i18n('tab_name');
            $scm->content  = Studip\Markup::purifyHtml(Request::i18n('content'));
            $scm->user_id  = $GLOBALS['user']->id;
            $scm->range_id = Context::getId();

            if ($scm->store() !== false) {
                PageLayout::postsuccess(_('Die Änderungen wurden übernommen.'));
            }

            $this->redirect('course/scm/' . $scm->id);
            return;
        }

        $this->set_title(_('Informationsseite bearbeiten') . ': ' . $scm->tab_name);
        Navigation::activateItem('/course/scm/' . $scm->id);
    }

    /**
     * Moves a page to the front so it becomes the first page the user will
     * see.
     *
     * @param String $id Id of the page to move
     */
    public function move_action(StudipScmEntry $scm)
    {
        if ($scm->range_id == Context::getId()){
            $query = "UPDATE `scm`
                      SET `position` = `position` + 1
                      WHERE `range_id` = :range_id AND `position` < :position";
            $statement = DBManager::get()->prepare($query);
            $statement->bindValue(':range_id', $scm->range_id);
            $statement->bindValue(':position', $scm->position);
            $statement->execute();

            $scm->position = 0;
            if ($scm->store()) {
                PageLayout::postSuccess(_('Der Eintrag wurde an die erste Position verschoben.'));
            }
        }
        $this->redirect('course/scm/' . $scm->id);
    }

    /**
     * Deletes a page.
     *
     * @param String $id Id of the page to delete
     */
    public function delete_action(StudipScmEntry $scm)
    {
        $ticket = Request::option('studip_ticket');
        if ($ticket && check_ticket($ticket)) {
            if ($scm->range_id == Context::getId()){
                $scm->delete();
                PageLayout::postSuccess(_('Der Eintrag wurde gelöscht.'));
            }
            $this->redirect('course/scm');
            return;
        }

        PageLayout::postError(
            _('Es ist ein Fehler aufgetreten.') . ' ' . _('Bitte versuchen Sie erneut, diese Seite zu löschen.')
        );
        $this->redirect('course/scm/' . $scm->id);
    }
}