Current File : //data/www_bck/varak.net_bck/ampache.varak.net/lib/class/random.class.php
<?php
/* vim:set softtabstop=4 shiftwidth=4 expandtab: */
/**
*
* LICENSE: GNU General Public License, version 2 (GPLv2)
* Copyright 2001 - 2014 Ampache.org
*
* 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; version 2
* of the License.
*
* 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.
*
*/
/**
* Random Class
*
* All of the 'random' type events, elements
*/
class Random
{
/**
* artist
* This returns the ID of a random artist, nothing special here for now
*/
public static function artist()
{
$sql = "SELECT `artist`.`id` FROM `artist` " .
"LEFT JOIN `song` ON `song`.`artist` = `artist`.`id` ";
if (AmpConfig::get('catalog_disable')) {
$sql .= "LEFT JOIN `catalog` ON `catalog`.`id` = `song`.`catalog` " .
"WHERE `catalog`.`enabled` = '1' ";
}
$sql .= "GROUP BY `artist`.`id` " .
"ORDER BY RAND() LIMIT 1";
$db_results = Dba::read($sql);
$results = Dba::fetch_assoc($db_results);
return $results['id'];
} // artist
/**
* playlist
* This returns a random Playlist with songs little bit of extra
* logic require
*/
public static function playlist()
{
$sql = "SELECT `playlist`.`id` FROM `playlist` LEFT JOIN `playlist_data` " .
" ON `playlist`.`id`=`playlist_data`.`playlist` WHERE `playlist_data`.`object_id` IS NOT NULL " .
" ORDER BY RAND()";
$db_results = Dba::read($sql);
$results = Dba::fetch_assoc($db_results);
return $results['id'];
} // playlist
/**
* get_single_song
* This returns a single song pulled based on the passed random method
*/
public static function get_single_song($type)
{
$song_id = 0;
$method_name = 'get_' . $type;
if (method_exists('Random', $method_name)) {
$song_ids = self::$method_name(1);
$song_id = array_pop($song_ids);
}
return $song_id;
} // get_single_song
/**
* get_default
* This just randomly picks a song at whim from all catalogs
* nothing special here...
*/
public static function get_default($limit = '')
{
$results = array();
if (empty($limit)) {
$limit = AmpConfig::get('offset_limit') ? AmpConfig::get('offset_limit') : '25';
}
$sql = "SELECT `song`.`id` FROM `song` ";
if (AmpConfig::get('catalog_disable')) {
$sql .= "LEFT JOIN `catalog` ON `catalog`.`id` = `song`.`catalog` " .
"WHERE `catalog`.`enabled` = '1' ";
}
$sql .= "ORDER BY RAND() LIMIT $limit";
$db_results = Dba::read($sql);
while ($row = Dba::fetch_assoc($db_results)) {
$results[] = $row['id'];
}
return $results;
} // get_default
/**
* get_album
* This looks at the last album played by the current user and
* picks something else in the same album
*/
public static function get_album($limit)
{
$results = array();
// Get the last album played by us
$data = $GLOBALS['user']->get_recently_played('1', 'album');
$where_sql = "";
if ($data[0]) {
$where_sql = " AND `song`.`album`='" . $data[0] . "' ";
}
$sql = "SELECT `song`.`id` FROM `song` ";
if (AmpConfig::get('catalog_disable')) {
$sql .= "LEFT JOIN `catalog` ON `catalog`.`id` = `song`.`catalog` " .
"WHERE `catalog`.`enabled` = '1' ";
} else {
$sql .= "WHERE '1' = '1' ";
}
$sql .= "$where_sql ORDER BY RAND() LIMIT $limit";
$db_results = Dba::read($sql);
while ($row = Dba::fetch_assoc($db_results)) {
$results[] = $row['id'];
}
return $results;
} // get_album
/**
* get_artist
* This looks at the last artist played and then randomly picks a song from the
* same artist
*/
public static function get_artist($limit)
{
$results = array();
$data = $GLOBALS['user']->get_recently_played('1','artist');
$where_sql = "";
if ($data[0]) {
$where_sql = " AND `song`.`artist`='" . $data[0] . "' ";
}
$sql = "SELECT `song`.`id` FROM `song` ";
if (AmpConfig::get('catalog_disable')) {
$sql .= "LEFT JOIN `catalog` ON `catalog`.`id` = `song`.`catalog` " .
"WHERE `catalog`.`enabled` = '1' ";
} else {
$sql .= "WHERE '1' = '1' ";
}
$sql .= "$where_sql ORDER BY RAND() LIMIT $limit";
$db_results = Dba::read($sql);
while ($row = Dba::fetch_assoc($db_results)) {
$results[] = $row['id'];
}
return $results;
} // get_artist
/**
* advanced
* This processes the results of a post from a form and returns an
* array of song items that were returned from said randomness
*/
public static function advanced($type, $data)
{
/* Figure out our object limit */
$limit = intval($data['random']);
// Generate our matchlist
/* If they've passed -1 as limit then get everything */
$limit_sql = "";
if ($data['random'] == "-1") { unset($data['random']); } else { $limit_sql = "LIMIT " . Dba::escape($limit); }
$search_data = Search::clean_request($data);
$search_info = false;
if (count($search_data) > 1) {
$search = new Search($type);
$search->parse_rules($search_data);
$search_info = $search->to_sql();
}
$sql = "";
switch ($type) {
case 'song':
$sql = "SELECT `song`.`id`, `size`, `time` " .
"FROM `song` ";
if ($search_info) {
$sql .= $search_info['table_sql'];
}
if (AmpConfig::get('catalog_disable')) {
$sql .= " LEFT JOIN `catalog` ON `catalog`.`id` = `song`.`catalog`";
$sql .= " WHERE `catalog`.`enabled` = '1'";
}
if ($search_info) {
if (AmpConfig::get('catalog_disable')) {
$sql .= ' AND ' . $search_info['where_sql'];
} else {
$sql .= ' WHERE ' . $search_info['where_sql'];
}
}
break;
case 'album':
$sql = "SELECT `album`.`id`, SUM(`song`.`size`) AS `size`, SUM(`song`.`time`) AS `time` FROM `album` ";
if (! $search_info || ! $search_info['join']['song']) {
$sql .= "LEFT JOIN `song` ON `song`.`album`=`album`.`id` ";
}
if ($search_info) {
$sql .= $search_info['table_sql'];
}
if (AmpConfig::get('catalog_disable')) {
$sql .= " LEFT JOIN `catalog` ON `catalog`.`id` = `song`.`catalog`";
$sql .= " WHERE `catalog`.`enabled` = '1'";
}
if ($search_info) {
if (AmpConfig::get('catalog_disable')) {
$sql .= ' AND ' . $search_info['where_sql'];
} else {
$sql .= ' WHERE ' . $search_info['where_sql'];
}
}
$sql .= ' GROUP BY `album`.`id`';
break;
case 'artist':
$sql = "SELECT `artist`.`id`, SUM(`song`.`size`) AS `size`, SUM(`song`.`time`) AS `time` FROM `artist` ";
if (! $search_info || ! $search_info['join']['song']) {
$sql .= "LEFT JOIN `song` ON `song`.`artist`=`artist`.`id` ";
}
if ($search_info) {
$sql .= $search_info['table_sql'];
}
if (AmpConfig::get('catalog_disable')) {
$sql .= " LEFT JOIN `catalog` ON `catalog`.`id` = `song`.`catalog`";
$sql .= " WHERE `catalog`.`enabled` = '1'";
}
if ($search_info) {
if (AmpConfig::get('catalog_disable')) {
$sql .= ' AND ' . $search_info['where_sql'];
} else {
$sql .= ' WHERE ' . $search_info['where_sql'];
}
}
$sql .= ' GROUP BY `artist`.`id`';
break;
}
$sql .= " ORDER BY RAND() $limit_sql";
// Run the query generated above so we can while it
$db_results = Dba::read($sql);
$results = array();
$size_total = 0;
$fuzzy_size = 0;
$time_total = 0;
$fuzzy_time = 0;
while ($row = Dba::fetch_assoc($db_results)) {
// If size limit is specified
if ($data['size_limit']) {
// Convert
$new_size = ($row['size'] / 1024) / 1024;
// Only fuzzy 100 times
if ($fuzzy_size > 100) {
break;
}
// Add and check, skip if over size
if (($size_total + $new_size) > $data['size_limit']) {
$fuzzy_size++;
continue;
}
$size_total = $size_total + $new_size;
$results[] = $row['id'];
// If we are within 4mb of target then jump ship
if (($data['size_limit'] - floor($size_total)) < 4) {
break; }
} // if size_limit
// If length really does matter
if ($data['length']) {
// base on min, seconds are for chumps and chumpettes
$new_time = floor($row['time'] / 60);
if ($fuzzy_time > 100) {
break;;
}
// If the new one would go over skip!
if (($time_total + $new_time) > $data['length']) {
$fuzzy_time++;
continue;
}
$time_total = $time_total + $new_time;
$results[] = $row['id'];
// If there are less then 2 min of free space return
if (($data['length'] - $time_total) < 2) {
return $results;
}
} // if length does matter
if (!$data['size_limit'] && !$data['length']) {
$results[] = $row['id'];
}
} // end while results
switch ($type) {
case 'song':
return $results;
case 'album':
$songs = array();
foreach ($results as $result) {
$album = new Album($result);
$songs = array_merge($songs, $album->get_songs());
}
return $songs;
case 'artist':
$songs = array();
foreach ($results as $result) {
$artist = new Artist($result);
$songs = array_merge($songs, $artist->get_songs());
}
return $songs;
default:
return false;
}
} // advanced
} //end of random class
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