<?php
/**
 * Data class for event RSVPs
 *
 * PHP version 5
 *
 * @category Data
 * @package  StatusNet
 * @author   Evan Prodromou <evan@status.net>
 * @license  http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
 * @link     http://status.net/
 *
 * StatusNet - the distributed open-source microblogging tool
 * Copyright (C) 2011, StatusNet, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

if (!defined('STATUSNET')) {
    exit(1);
}

/**
 * Data class for event RSVPs
 *
 * @category Event
 * @package  StatusNet
 * @author   Evan Prodromou <evan@status.net>
 * @license  http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
 * @link     http://status.net/
 *
 * @see      Managed_DataObject
 */

class RSVP extends Managed_DataObject
{
    const POSITIVE = 'http://activitystrea.ms/schema/1.0/rsvp-yes';
    const POSSIBLE = 'http://activitystrea.ms/schema/1.0/rsvp-maybe';
    const NEGATIVE = 'http://activitystrea.ms/schema/1.0/rsvp-no';

    public $__table = 'rsvp'; // table name
    public $id;                // varchar(36) UUID
    public $uri;               // varchar(255)
    public $profile_id;        // int
    public $event_id;          // varchar(36) UUID
    public $response;            // tinyint
    public $created;           // datetime

    /**
     * Get an instance by key
     *
     * @param string $k Key to use to lookup (usually 'id' for this class)
     * @param mixed  $v Value to lookup
     *
     * @return RSVP object found, or null for no hits
     *
     */
    function staticGet($k, $v=null)
    {
        return Memcached_DataObject::staticGet('RSVP', $k, $v);
    }

    /**
     * Get an instance by compound key
     *
     * @param array $kv array of key-value mappings
     *
     * @return Bookmark object found, or null for no hits
     *
     */

    function pkeyGet($kv)
    {
        return Memcached_DataObject::pkeyGet('RSVP', $kv);
    }

    /**
     * Add the compound profile_id/event_id index to our cache keys
     * since the DB_DataObject stuff doesn't understand compound keys
     * except for the primary.
     *
     * @return array
     */
    function _allCacheKeys() {
        $keys = parent::_allCacheKeys();
        $keys[] = self::multicacheKey('RSVP', array('profile_id' => $this->profile_id,
                                                    'event_id' => $this->event_id));
        return $keys;
    }

    /**
     * The One True Thingy that must be defined and declared.
     */
    public static function schemaDef()
    {
        return array(
            'description' => 'Plan to attend event',
            'fields' => array(
                'id' => array('type' => 'char',
                              'length' => 36,
                              'not null' => true,
                              'description' => 'UUID'),
                'uri' => array('type' => 'varchar',
                               'length' => 255,
                               'not null' => true),
                'profile_id' => array('type' => 'int'),
                'event_id' => array('type' => 'char',
                              'length' => 36,
                              'not null' => true,
                              'description' => 'UUID'),
                'response' => array('type' => 'char',
                                  'length' => '1',
                                  'description' => 'Y, N, or ? for three-state yes, no, maybe'),
                'created' => array('type' => 'datetime',
                                   'not null' => true),
            ),
            'primary key' => array('id'),
            'unique keys' => array(
                'rsvp_uri_key' => array('uri'),
                'rsvp_profile_event_key' => array('profile_id', 'event_id'),
            ),
            'foreign keys' => array('rsvp_event_id_key' => array('event', array('event_id' => 'id')),
                                    'rsvp_profile_id__key' => array('profile', array('profile_id' => 'id'))),
            'indexes' => array('rsvp_created_idx' => array('created')),
        );
    }

    function saveNew($profile, $event, $verb, $options=array())
    {
        common_debug("RSVP::saveNew({$profile->id}, {$event->id}, '$verb', 'some options');");

        if (array_key_exists('uri', $options)) {
            $other = RSVP::staticGet('uri', $options['uri']);
            if (!empty($other)) {
                throw new ClientException(_('RSVP already exists.'));
            }
        }

        $other = RSVP::pkeyGet(array('profile_id' => $profile->id,
                                     'event_id' => $event->id));

        if (!empty($other)) {
            throw new ClientException(_('RSVP already exists.'));
        }

        $rsvp = new RSVP();

        $rsvp->id          = UUID::gen();
        $rsvp->profile_id  = $profile->id;
        $rsvp->event_id    = $event->id;
        $rsvp->response      = self::codeFor($verb);

        if (array_key_exists('created', $options)) {
            $rsvp->created = $options['created'];
        } else {
            $rsvp->created = common_sql_now();
        }

        if (array_key_exists('uri', $options)) {
            $rsvp->uri = $options['uri'];
        } else {
            $rsvp->uri = common_local_url('showrsvp',
                                        array('id' => $rsvp->id));
        }

        $rsvp->insert();

        // XXX: come up with something sexier

        $content = sprintf(_('RSVPed %s for an event.'),
                           ($verb == RSVP::POSITIVE) ? _('positively') :
                           ($verb == RSVP::NEGATIVE) ? _('negatively') :
                           _('possibly'));
        
        $rendered = $content;

        $options = array_merge(array('object_type' => $verb),
                               $options);

        if (!array_key_exists('uri', $options)) {
            $options['uri'] = $rsvp->uri;
        }

        $eventNotice = $event->getNotice();

        if (!empty($eventNotice)) {
            $options['reply_to'] = $eventNotice->id;
        }

        $saved = Notice::saveNew($profile->id,
                                 $content,
                                 array_key_exists('source', $options) ?
                                 $options['source'] : 'web',
                                 $options);

        return $saved;
    }

    function codeFor($verb)
    {
        return ($verb == RSVP::POSITIVE) ? 'Y' :
            ($verb == RSVP::NEGATIVE) ? 'N' :
            ($verb == RSVP::POSSIBLE) ? '?' : null;
    }

    static function verbFor($code)
    {
        return ($code == 'Y') ? RSVP::POSITIVE :
            ($code == 'N') ? RSVP::NEGATIVE :
            ($code == '?') ? RSVP::POSSIBLE : null;
    }

    function getNotice()
    {
        $notice = Notice::staticGet('uri', $this->uri);
        if (empty($notice)) {
            throw new ServerException("RSVP {$this->id} does not correspond to a notice in the DB.");
        }
        return $notice;
    }

    static function fromNotice($notice)
    {
        return RSVP::staticGet('uri', $notice->uri);
    }

    static function forEvent($event)
    {
        $rsvps = array(RSVP::POSITIVE => array(),
                       RSVP::NEGATIVE => array(),
                       RSVP::POSSIBLE => array());

        $rsvp = new RSVP();

        $rsvp->event_id = $event->id;

        if ($rsvp->find()) {
            while ($rsvp->fetch()) {
                $verb = self::verbFor($rsvp->response);
                $rsvps[$verb][] = clone($rsvp);
            }
        }

        return $rsvps;
    }
}