<?php

/**
 * @author      Till Glöggler <tgloeggl@uos.de>
 * @author      André Klaßen <klassen@elan-ev.de>
 * @license     GPL 2 or later
 */

namespace Studip\Activity;

class ParticipantsProvider implements ActivityProvider
{

    /**
     * posts an activity for a given notification event
     *
     * @param String $event a notification for an activity
     * @param String  $course_id
     * @param String  $user_id
     */
    public static function postActivity($event, $course_id, $user_id)
    {
        $course = \Course::find($course_id);

        if ($event == 'UserDidEnterCourse') {
            $verb = 'created';
            $summary = _('%s wurde in die Veranstaltung "%s" eingetragen.');
            $summary = sprintf($summary, get_fullname($user_id), $course->name);
        } elseif ($event == 'UserDidLeaveCourse') {
            $verb = 'voided';
            $summary = _('%s wurde aus der Veranstaltung "%s" ausgetragen.');
            $summary = sprintf($summary, get_fullname($user_id), $course->name);
        }

        $type = get_object_type($course_id);

        $activity = Activity::create(
            [
                'provider'     => __CLASS__,
                'context'      => ($type == 'sem') ? 'course' : 'institute',
                'context_id'   => $course_id,
                'content'      => $summary,
                'actor_type'   => 'user',               // who initiated the activity?
                'actor_id'     => $GLOBALS['user']->id, // id of initiator
                'verb'         => $verb,                // the activity type
                'object_id'    => $course_id,           // the id of the referenced object
                'object_type'  => 'participants',       // type of activity object
                'mkdate'       =>  time(),
            ]
        );

    }

    /**
     * get the details for the passed activity
     *
     * @param object $activity the activity to fill with details, passed by reference
     */
    public function getActivityDetails($activity)
    {
        $activity->content = htmlReady($activity->content);

        $url = \URLHelper::getUrl("dispatch.php/course/members/index", ['cid' => $activity->context_id]);

        $activity->object_url = [
            $url => _('Zur Veranstaltung')
        ];

        return true;
    }

    /**
     * {@inheritdoc}
     */
    public static function getLexicalField()
    {
        return _('eine/n Teilnehmer/in');
    }

}