<?php
/**
 * statusgroups.php - trails-controller for managing statusgroups
 *
 * 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      Florian Bieringer <florian.bieringer@uni-passau.de>
 * @author      Sebastian Hobert <sebastian.hobert@uni-goettingen.de>
 * @license     http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
 * @category    Stud.IP
 */

class Admin_StatusgroupsController extends AuthenticatedController
{
    /**
     * Initializes the controller
     *
     * @param String $action Action to execute
     * @param Array  $args   Arguments
     */
    public function before_filter(&$action, &$args)
    {
        parent::before_filter($action, $args);

        if (Request::submitted('abort')) {
            $this->redirect('admin/statusgroups/index');
        }

        $this->user_id = $GLOBALS['user']->user_id;

        // Set pagelayout
        PageLayout::addStyleSheet('studip-statusgroups.css');
        PageLayout::addScript('studip-statusgroups.js');
        PageLayout::setHelpKeyword("Basis.Allgemeines");
        PageLayout::setTitle(_("Verwaltung von Funktionen und Gruppen"));
        Navigation::activateItem('/admin/institute/groups');

        // Change header_line if open object
        if ($header_line = Context::getHeaderLine()) {
            PageLayout::setTitle($header_line." - ".PageLayout::getTitle());
        }

        // Include url for ajax moving of members in group to page header
        PageLayout::addHeadElement('meta', [
            'name'    => 'statusgroups-ajax-movable-endpoint',
            'content' => $this->url_for('admin/statusgroups/move'),
        ]);

        $this->setType();
        // Check if the viewing user should get the admin interface
        $this->tutor = $this->type['edit']($this->user_id);
    }

    /**
     * Basic display of the groups
     */
    public function index_action()
    {
        $lockrule = LockRules::getObjectRule(Context::getId());
        $this->is_locked = LockRules::Check(Context::getId(), 'groups');
        if ($lockrule->description && $this->is_locked) {
            PageLayout::postMessage(MessageBox::info(formatLinks($lockrule->description)));
        }
        // Setup sidebar.
        $sidebar = Sidebar::get();
        if ($this->tutor) {
            $widget = new ActionsWidget();
            $widget->addLink(_('Neue Gruppe anlegen'),
                             $this->url_for('admin/statusgroups/editGroup'),
                             Icon::create('group3+add', 'clickable'))
                   ->asDialog('size=auto');
            $widget->addLink(_('Gruppenreihenfolge ändern'),
                             $this->url_for('admin/statusgroups/sortGroups'),
                             Icon::create('arr_2down', 'clickable'))
                   ->asDialog();
            $sidebar->addWidget($widget);
        }
        // Collect all groups
        $this->loadGroups();

        $institute = Institute::find(Context::getId());

        $this->membersOfInstitute = $institute->members->orderBy('nachname')->pluck('user_id');
        $assigned = array_unique(array_flatten($institute->all_status_groups->map(function ($group) {
            return $group->members->pluck('user_id');
        })));

        $this->not_assigned = array_diff(
            $this->membersOfInstitute,
            $assigned
        );

        // Create multiperson search type
        $query = "SELECT auth_user_md5.user_id, CONCAT({$GLOBALS['_fullname_sql']['full']}, ' (', auth_user_md5.username, ')') as fullname
                  FROM auth_user_md5
                  LEFT JOIN user_info ON (user_info.user_id = auth_user_md5.user_id)
                  WHERE (
                      CONCAT(auth_user_md5.Vorname, ' ', auth_user_md5.Nachname) LIKE :input
                      OR CONCAT(auth_user_md5.Nachname, ' ', auth_user_md5.Vorname) LIKE :input
                      OR auth_user_md5.username LIKE :input
                    )
                    AND auth_user_md5.perms IN ('autor', 'tutor', 'dozent')
                    AND auth_user_md5.visible <> 'never'
                ORDER BY Vorname, Nachname";
        $this->searchType = new SQLSearch($query, _('Teilnehmende/n suchen'), 'username');
    }

    /**
     * Interface to edit a group or create a new one.
     *
     * @param string group id
     */
    public function editGroup_action($group_id = null)
    {
        $this->check('edit');

        if (Request::isPost()) {
            $group = new Statusgruppen($group_id);
            if ($group->isNew()) {
                $group->range_id = Context::getId();
            } else {
                DataFieldEntry::removeAll(['', $group->statusgruppe_id]);
            }

            $group->name       = Request::i18n('name');
            $group->name_w     = Request::i18n('name_w');
            $group->name_m     = Request::i18n('name_m');
            $group->size       = Request::int('size', 0);
            $group->range_id   = Request::option('range_id', $group->range_id);
            $group->position   = Request::int('position', $group->position);
            $group->selfassign = Request::int('selfassign', 0);
            $group->store();

            $group->setDatafields(Request::getArray('datafields'));

            $message = $group->isNew()
                     ? _('Die Gruppe wurde angelegt.')
                     : _('Die Gruppe wurde gespeichert');
            PageLayout::postSuccess($message);
            $this->redirect('admin/statusgroups');
            return;
        }

        $this->group = new Statusgruppen($group_id);
        if ($this->group->isNew()) {
            $this->group->range_id = Context::getId();
        }
        $this->loadGroups();
    }

    /**
     * Interface to sort groups
     */
    public function sortGroups_action()
    {
        $this->check('edit');

        if (Request::isPost()) {
            $newOrder = json_decode(Request::get('ordering'));
            $this->updateRecoursive($newOrder, Context::getId());

           PageLayout::postMessage(MessageBox::success(_('Die Gruppenreihenfolge wurde gespeichert.')));
           $this->redirect('admin/statusgroups');
           return;
        }

        $this->loadGroups();
    }

    /**
     * Action to add multiple members to a group.
     *
     * @param string group id
     */
    public function memberAdd_action($group_id)
    {
        $this->check('edit');

        $mp = MultiPersonSearch::load("add_statusgroup" . $group_id);
        $this->group = new Statusgruppen($group_id);
        $countAdded = 0;
        foreach ($mp->getAddedUsers() as $a) {
            if ($this->group->addUser($a)) {
                $this->type['after_user_add']($a);
                $countAdded++;
            }
        }

        if ($countAdded > 0) {
            $message = sprintf(ngettext('Es wurde eine Person hinzugefügt.',
                                        'Es wurden %u Personen hinzugefügt.',
                                        $countAdded),
                               $countAdded);
            PageLayout::postMessage(MessageBox::success($message));
        }

        $this->redirect('admin/statusgroups#group-' . $group_id);
    }

    /**
     * Ajax action to move a user
     */
    public function move_action()
    {
        $this->check('edit');
        $GLOBALS['perm']->check('tutor');

        $group   = Request::get('group');
        $user_id = Request::get('user');
        $pos     = Request::get('pos');

        $this->group = new Statusgruppen($group);
        $this->group->moveUser($user_id, $pos);
        $this->type['after_user_move']($user_id);
        $this->users = $this->group->members;
        $this->renderGroupOrRedirect($group);
    }

    /**
     * Ajaxaction to delete a user
     */
    public function delete_action($group_id, $user_id)
    {
        $this->check('edit');

        $this->group = new Statusgruppen($group_id);
        $this->user  = new User($user_id);

        if (Request::submitted('confirm')) {
            $this->group->removeUser($user_id);
            $this->type['after_user_delete']($user_id);
            $this->renderGroupOrRedirect($group_id);
        }
    }

    /**
     * Delete a group
     */
    public function deleteGroup_action($group_id)
    {
        $this->check('edit');
        $this->group = new Statusgruppen($group_id);
        if (Request::submitted('confirm')) {
            CSRFProtection::verifySecurityToken();

            // move all subgroups to the parent
            $children = SimpleORMapCollection::createFromArray($this->group->children);
            $children->setValue('range_id', $this->group->range_id);
            $children->store();

            //remove users
            $this->group->removeAllUsers();
            //remove datafields
            DataFieldEntry::removeAll(['', $this->group->statusgruppe_id]);

            //goodbye group
            $this->group->delete();
            $this->redirect('admin/statusgroups/index');
        }
    }

    /**
     * Sort a group
     */
    public function sortAlphabetic_action($group_id)
    {
        $this->check('edit');
        $this->group = new Statusgruppen($group_id);
        if (Request::submitted('confirm')) {
            CSRFProtection::verifySecurityToken();
            $this->group->sortMembersAlphabetic();
            $this->redirect('admin/statusgroups/index#group-' . $group_id);
        }
    }

    /**
     * Sort list of subgroups
     */
    public function sortGroupsAlphabetical_action($group_id)
    {
        $this->check('edit');
        $this->group = new Statusgruppen($group_id);
        $this->group->sortSubGroupsAlphabetic();
        $this->redirect('admin/statusgroups/index#group-' . $group_id);
    }

    /**
     * Action to select institute. This should be put somewhere else since we
     * have to do this on EVERY institute page
     */
    public function selectInstitute_action()
    {

    }

    /* *********************************
     * ***** PRIVATE HELP FUNCTIONS ****
     * *********************************/

    /*
     * Loads groups from the database.
     */
    private function loadGroups()
    {
        $this->groups = Institute::findCurrent()->status_groups;
    }

    /*
     * Updates groups recursivly.
     */
    private function updateRecoursive($obj, $parent)
    {
        $i = 0;
        if ($obj) {
            foreach ($obj as $group) {
                $statusgroup = new Statusgruppen($group->id);
                $statusgroup->range_id = $parent;
                $statusgroup->position = $i;
                $statusgroup->store();
                $this->updateRecoursive($group->children, $group->id);
                $i++;
            }
        }
    }

    /*
     * Renders an action (ajax) or redirects to the statusgroup index page (no ajax).
     */
    private function renderGroupOrRedirect($group_id)
    {
        if (Request::isXhr()) {
            $this->render_action('_members');
        } else {
            $this->redirect('admin/statusgroups#group-' . $group_id);
        }
    }

    /*
     * Checks if the current user has the specific $rights
     */
    private function check($rights)
    {
        if (!$this->type[$rights]($this->user_id)) {
            throw new AccessDeniedException();
        }
    }

    /*
     * This sets the type of statusgroup. By now it only supports
     * Inst statusgroup but could be extended
     */
    private function setType()
    {

        if (get_object_type(Context::getId(), ['inst', 'fak'])) {
            $type = 'inst';
        }
        $types = $this->types();

        if (!$type || Request::submitted('type') && $type != Request::get('type')) {
            $types[Request::get('type', 'inst')]['redirect']();
        } else {
            $this->type = $types[$type];
        }
    }

    /*
     * This is the rest of the idea we could use statusgroups on other pages.
     * navigation and redirect to selection page must move here if the
     * statusgroupspage is reused
     *
     * @return type
     */
    private function types()
    {
        return [
            'inst' => [
                'name' => _('Institut'),
                'after_user_add' => function ($user_id) {
                    $newInstUser = new InstituteMember([$user_id, Context::getId()]);
                    if ($newInstUser->isNew() || $newInstUser->inst_perms == 'user') {
                        $user = new User($user_id);
                        $newInstUser->inst_perms = $user->perms;
                        if ($newInstUser->store()) {
                            InstituteMember::ensureDefaultInstituteForUser($user->id);
                            StudipLog::INST_USER_ADD(Context::getId(), $user->id, $user->perms);
                        }
                    }
                },
                'after_user_delete' => function ($user_id) {
                    null;
                },
                'after_user_move' => function ($user_id) {
                    null;
                },
                'view' => function ($user_id) {
                    return true;
                },
                'needs_size' => false,
                'needs_self_assign' => false,
                'edit' => function ($user_id) {
                    return $GLOBALS['perm']->have_studip_perm('admin', Context::getId()) && !LockRules::Check(Context::getId(), 'groups');
                },
                'redirect' => function () {
                    require_once 'lib/admin_search.inc.php';
                    die(); //must not return
                },
                'groups' => [
                    'members' => [
                        'name' => _('Mitglieder'),
                    ]
                ]
            ]
        ];
    }

}