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<?php
/*
Copyright (c) 2001 - 2007 Ampache.org
All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License v2
as published by the Free Software Foundation.
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/**
* Democratic
* This class handles democratic play, which is a fancy
* name for voting based playback. This extends the tmpplaylist
*/
class Democratic extends tmpPlaylist {
/**
* get_playlists
* This returns all of the current valid 'Democratic' Playlists
* that have been created.
*/
public static function get_playlists() {
// Pull all tmp playlsits with a session of < 0 (as those are fake)
// This is kind of hackish, should really think about tweaking the db
// and doing this right.
$sql = "SELECT `id` FROM `tmp_playlist` WHERE `session`< '0'";
$db_results = Dba::query($sql);
$results = array();
while ($row = Dba::fetch_assoc($db_results)) {
$results[] = $row['id'];
}
return $results;
} // get_playlists
/**
* get_current_playlist
* This returns the curren users current playlist, or if specified
* this current playlist of the user
*/
public static function get_current_playlist($user_id='') {
// If not passed user global
$user_id = $user_id ? $user_id : $GLOBALS['user']->id;
/* Find the - 1 one for now */
$sql = "SELECT `id` FROM `tmp_playlist` WHERE `session`='-1'";
$db_results = Dba::query($sql);
$row = Dba::fetch_assoc($db_results);
$object = new Democratic($row['id']);
return $object;
} // get_current_playlist
/**
* get_items
* This returns an array of all object_ids currently in this tmpPlaylist. This
* has gotten a little more complicated because of type, the values are an array
* 0 being ID 1 being TYPE
*/
public function get_items() {
$order = "GROUP BY tmp_playlist_data.id ORDER BY `count` DESC, user_vote.date ASC";
$vote_select = ", COUNT(user_vote.user) AS `count`";
$vote_join = "INNER JOIN user_vote ON user_vote.object_id=tmp_playlist_data.id";
/* Select all objects from this playlist */
$sql = "SELECT tmp_playlist_data.object_type, tmp_playlist_data.id, tmp_playlist_data.object_id $vote_select " .
"FROM tmp_playlist_data $vote_join " .
"WHERE tmp_playlist_data.tmp_playlist='" . Dba::escape($this->id) . "' $order";
$db_results = Dba::query($sql);
/* Define the array */
$items = array();
while ($results = Dba::fetch_assoc($db_results)) {
$key = $results['id'];
$items[$key] = array($results['object_id'],$results['object_type']);
}
return $items;
} // get_items
/**
* vote
* This function is called by users to vote on a system wide playlist
* This adds the specified objects to the tmp_playlist and adds a 'vote'
* by this user, naturally it checks to make sure that the user hasn't
* already voted on any of these objects
*/
public function vote($items) {
/* Itterate through the objects if no vote, add to playlist and vote */
foreach ($items as $type=>$object_id) {
if (!$this->has_vote($object_id,$type)) {
$this->add_vote($object_id,$this->id,$type);
}
} // end foreach
} // vote
/**
* has_vote
* This checks to see if the current user has already voted on this object
*/
public function has_vote($object_id,$type='') {
$tmp_id = Dba::escape($this->id);
$object_id = Dba::escape($object_id);
$type = $type ? Dba::escape($type) : 'song';
$user_id = Dba::escape($GLOBALS['user']->id);
/* Query vote table */
$sql = "SELECT tmp_playlist_data.id FROM `user_vote` " .
"INNER JOIN tmp_playlist_data ON tmp_playlist_data.id=user_vote.object_id " .
"WHERE user_vote.user='$user_id' AND tmp_playlist_data.object_type='$type' " .
"AND tmp_playlist_data.object_id='$object_id' " .
"AND tmp_playlist_data.tmp_playlist='$tmp_id'";
$db_results = Dba::query($sql);
/* If we find row, they've voted!! */
if (Dba::num_rows($db_results)) {
return true;
}
return false;
} // has_vote
/**
* add_vote
* This takes a object id and user and actually inserts the row
*/
public function add_vote($object_id,$tmp_playlist,$object_type='') {
$object_id = Dba::escape($object_id);
$tmp_playlist = Dba::escape($tmp_playlist);
$object_type = $object_type ? Dba::escape($object_type) : 'song';
/* If it's on the playlist just vote */
$sql = "SELECT `id` FROM `tmp_playlist_data` " .
"WHERE `tmp_playlist_data`.`object_id`='$object_id'";
$db_results = Dba::query($sql);
/* If it's not there, add it and pull ID */
if (!$results = Dba::fetch_assoc($db_results)) {
$sql = "INSERT INTO `tmp_playlist_data` (`tmp_playlist`,`object_id`,`object_type`) " .
"VALUES ('$tmp_playlist','$object_id','$object_type')";
$db_results = Dba::query($sql);
$results['id'] = Dba::insert_id();
}
/* Vote! */
$time = time();
$sql = "INSERT INTO user_vote (`user`,`object_id`,`date`) " .
"VALUES ('" . Dba::escape($GLOBALS['user']->id) . "','" . $results['id'] . "','$time')";
$db_results = Dba::query($sql);
return true;
} // add_vote
} // Democratic class
?>
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