<?php

/**

 * Utility functions

 * 

 * Web control interface script for Amarok

 * Written by Dan Fuhry - 2008

 *

 * This script is in the public domain. Use it for good, not evil.

 */

/**

 * Utility/reporting functions

 */

/**

 * Report a fatal error and exit

 * @param string Error message

 */

function burnout($msg)

{

  echo "\x1B[31;1m[WebControl] fatal: \x1B[37;1m";

  echo "$msg\x1B[0m\n";

  exit(1);

}

/**

 * Print a stylized status message, compatible with Linux consoles

 * @param string Status message

 */

function status($msg)

{

  echo "\x1B[32;1m[WebControl] \x1B[32;0m$msg\x1B[0m\n";

}

/**

 * Performs an action with DCOP.

 * @param string DCOP component, e.g. player, playlist, playlistbrowser, ...

 * @param string Action to perform, e.g. stop, play, ...

 * @param string additional parameters... (NOT IMPLEMENTED)

 * @return mixed output of DCOP command

 */

function dcop_action($component, $action)

{

  $tmpfile = tempnam('amaweb', '');

  if ( !$tmpfile )

    burnout('tempnam() failed us');

  system("dcop amarok $component $action > $tmpfile");

  $output = @file_get_contents($tmpfile);

  @unlink($tmpfile);

  $output = trim($output);

  // detect type of output

  if ( $output == 'true' )

    return true;

  else if ( $output == 'false' )

    return false;

  else if ( preg_match('/^-?[0-9]+/', $output) )

    return intval($output);

  else

    return $output;

}

/**

 * Rebuilds the copy of the playlist in RAM

 */

$playlist_last_md5 = '';

function rebuild_playlist()

{

  // import what we need

  global $homedir, $playlist;

  // sync and load the playlist file

  $playlist_file = dcop_action('playlist', 'saveCurrentPlaylist');

  // check MD5 - if it's not changed, exit to save CPU cycles

  global $playlist_last_md5;

  if ( $playlist_last_md5 == @md5_file($playlist_file) )

  {

    return true;

  }

  $playlist_last_md5 = @md5_file($playlist_file);

  // start XML parser

  try

  {

    $xml = simplexml_load_file($playlist_file);

  }

  catch ( Exception $e )

  {

    burnout("Caught exception trying to load playlist file:\n$e");

  }

  $attribs = $xml->attributes();

  if ( @$attribs['product'] != 'Amarok' )

  {

    burnout('Playlist is not in Amarok format');

  }

  $playlist = array();

  foreach ( $xml->children() as $child )

  {

    $attribs = $child->attributes();

    $item = array(

        'uri'    => $attribs['uri'],

        'title'  => strval($child->Title),

        'artist' => strval($child->Artist),

        'album'  => strval($child->Album),

        'length' => seconds_to_str(intval($child->Length)),

        'length_int' => intval($child->Length)

      );

    $playlist[] = $item;

  }

}

/**

 * Converts a number to minute:second format

 * @param int Seconds

 * @return string format: mm:ss

 */

function seconds_to_str($secs)

{

  $seconds = $secs % 60;

  $minutes = ( $secs - $seconds ) / 60;

  $seconds = strval($seconds);

  $minutes = strval($minutes);

  if ( strlen($seconds) < 2 )

    $seconds = "0$seconds";

  if ( strlen($minutes) < 2 )

    $minutes = "0$minutes";

  return "$minutes:$seconds";

}