<?

// this is a php script that will be called using AJAX by a muschoose form handler.
// when first called in an experimental session, it will generate an EchoNest
// static playlist and cache that playlist in the $_SESSION array. It will then,
// and from that point forward, return items form the playlist, until the playlist
// has been exhausted.
//
// this script assumes you've populated the $_SESSION['en_params'] and 
// $_SESSION['en_params']['playlist_params'] array locations
//
// FB <fbarrett@ucdavis.edu> 2011.04.27

include_once('../include/subject_includes.php');
include_once('../include/ensemble_echonest_api.php');

$_SESSION['submit_stimulus_id'] = TRUE;

// get info from experiment_x_form and form tables
include_once('query_form_info.php');

// set params to construct this playlist
$_SESSION['stim_root'] = 'https://atonal.ucdavis.edu/ensemble/stimuli/';
$_SESSION['en_params'] = array();
$_SESSION['en_params']['api_key'] = 'QVKVLGQZD44CKT8CX';
$_SESSION['en_params']['preferred'] = TRUE;
$_SESSION['en_params']['playlist_type'] = 'static';
$_SESSION['en_params']['playlist_params'] = array();
$_SESSION['en_params']['playlist_params']['api_key'] = $_SESSION['en_params']['api_key'];
$_SESSION['en_params']['playlist_params']['format'] = 'json';
$_SESSION['en_params']['playlist_params']['type'] = 'artist-description';
$_SESSION['en_params']['playlist_params']['limit'] = 'true';
$_SESSION['en_params']['playlist_params']['bucket']['id']='CAOHBSP12F74BFBF10';
$_SESSION['en_params']['playlist_params']['bucket']['tracks'] = '';
$_SESSION['en_params']['playlist_params']['variety'] = 1;
$_SESSION['en_params']['playlist_params']['results'] = 100;
$_SESSION['en_params']['playlist_params']['description'] = array();
$_SESSION['en_params']['playlist_params']['description']['style'] = get_stomp_genres($_SESSION['en_params']['preferred']);

// debugging
$outpath = '/home/fbarrett/data/logs/echonest_ensemble/js_muschoose_ENplaylist_ajax.php';
$oh = fopen($outpath,'a+');
fwrite($oh,"\n----------------------\nDate:" . date('MdYHis') . "\n");

// if no en_playlist is set, retrieve one!
if (!isset($_SESSION['en_playlist'])) {
  fwrite($oh,"\ngetting EN playlist, type {$_SESSION['en_params']['playlist_type']}\n");
  // get an EchoNest playlist
  $pltype = $_SESSION['en_params']['playlist_type'];
  $_SESSION['en_playlist'] = get_echonest_data('playlist/'.$pltype,$_SESSION['en_params']['playlist_params']);
  fwrite($oh,"GOT IT\n");
 }

// if no songs are left, return an error
if (!count($_SESSION['en_playlist'])) {
  fwrite($oh,"no songs in playlist??\n");
  error("js_muschoose_ENplaylist_ajax:en_playlist:error");
 }

// get the next stimid
$ENstim = array_pop($_SESSION['en_playlist']->{'songs'});
$ENid = $ENstim->{'foreign_ids'}[0]->{'foreign_id'};
preg_match('/.*:(\d*)/',$ENid,$matches);

// if we couldn't find the stimid, return an error
if (!count($matches)) {
  error("js_muschoose_ENplaylist_ajax:matches:error");
 }

// get the location of the next stim
$sql = "SELECT location FROM stimulus WHERE stimulus_id=" . $matches[1];
$results = mysql_query($sql);
$nrows = mysql_num_rows($results);

// if we couldn't find the stim in the database, return an error
if (!$nrows) {
  error("js_muschoose_ENplaylist_ajax:mysql error:".mysql_error());
 }

// return the data in json format
$sresult = mysql_fetch_assoc($results);
$qua = '{"url":"' . $_SESSION['stim_root'] . $sresult['location'] . '","stimid","' . $matches[1] . '"}';
$arr = array('url' => $_SESSION['stim_root'] . $sresult['location'],'stimid'=>$matches[1]);
fwrite($oh,"json: " . json_encode($arr) . "\n");
fwrite($oh,"qua: $qua\n");
fclose($oh);
//echo json_encode($arr);
echo $qua;
?>