// Playlist
// v0.41
// Copyright (c) 2005, Leonard Lin
// Copyright (c) 2005, Wayne Burkett 
// Released under the GPL license
// http://www.gnu.org/copyleft/gpl.html
//
// Version History
// ---
// 2005-12-05 - v0.41 - Changed encodeURIComponent() to encodeURI() to fix
//                      parentheses causing iTunes Opener for OS X to barf 
// 2005-09-03 - v0.40 - Leonard's customizations: 
//                      * added namespacing (function wrapper)
//                      * fixed bizarre first-load apache2 index bug by 
//                        removing onload
//                      * made listener only launch on
//                      * added m4a to Xpath / Regex
//                      * space encoding 
//                        (http://dionidium.com/2005/06/playlist#c00381)
// 2005-06-13 - v0.30 - Further modified styles 
// 2005-06-11 - v0.20 - Modified styles 
// 2005-06-07 - v0.10 - Released: http://dionidium.com/2005/06/playlist
//
//
// This is a Greasemonkey user script. 
// http://greasemonkey.mozdev.org/
//
// Credits:
// Hublog's Bookmarklet [http://hublog.hubmed.org/archives/001139.html]
// DiveIntoGreasemonkey [http://diveintogreasemonkey.org/patterns/add-css.html]
// Stylegala's Bullet Madness [http://www.stylegala.com/features/bulletmadness/]
// The data: URI Kitchen [http://software.hixie.ch/utilities/cgi/data/data]
//
// ==UserScript==
// @name          Playlist
// @namespace     http://dionidium.com/projects/greasemonkey/
// @description   Generate an M3U playlist of all the MP3s on a page
// @include       *
// ==/UserScript==

(function() {

  function addStyles(css) {
      var head, style;
      head = document.getElementsByTagName('head')[0];
      if (!head) { return; }
      style = document.createElement('style');
      style.type = 'text/css';
      style.innerHTML = css;
      head.appendChild(style);
  }
  
  var i, href, m3u, div, img;
  
  // MP3s or M4As
  var xpath = '//a[contains(@href, "mp3")] | //a[contains(@href, "m4a")]';
  var mp3s  = document.evaluate(xpath, document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
  
  var links = new Array();
  for (i = 0; i < mp3s.snapshotLength; i += 1) {
      href = mp3s.snapshotItem(i).href;
      if (href.match(/\.mp3$/) || href.match(/\.m4a$/)) { links.push(href.replace(/%20/g, "%2520")); }
  }
  m3u = links.join('%0A'); // newline
  if(!m3u) { return; }
  img = 
      '<img src="data:image/png,%89PNG%0D%0A%1A%0A%00%00%00%0DIHDR%00%00%00%0C%00%00%00%0C%08%00'  +
      '%00%00%00s%1E%03%3B%00%00%00%02bKGD%00%FF%87%8F%CC%BF%00%00%00%09pHYs%00%00%0B%13%00%00%0B' +
      '%13%01%00%9A%9C%18%00%00%00%07tIME%07%D5%06%07%06%2F%0Em%99%83%FD%00%00%00sIDATx%DAM%CC%AD' +
      '%0A%C2%60%00F%E1%E7%9B%DF%FCc%0B%06%B3W%25%88%C5%A0A%D0%AB1Y%0C%16%8B7%25%08%C6%05%C3d%0A'  +
      '%D3%E0d%9E%F2r8%F0%86BK%F2%9D%ED%9F%CC%DE%AD%AC%07%15s%A2E%B7%AE%D3%17%A7%E5!%CA%C3%B3%EA'  +
      '%F5%91K%94%E5cpIq%95%C8%3A%D9%7Dr%C3X%B4c%15Gl%F6B%01%D3%E1%F1w%1D%9C3hJ%C3%07h%02%182%E1k' +
      '%AB%AC%00%00%00%00IEND%AEB%60%82">';
  div = document.createElement('div');
  div.id = 'gm-playlist';
  div.innerHTML = '<a href="data:audio/x-mpegurl,' + encodeURI('#EXTM3U\n') + m3u + '">' + img + '</a>';

  // (onload caused problems - not needed)
  if(m3u) {
    document.body.appendChild(div);
  }

  addStyles(
  '#gm-playlist div, #gm-playlist a,' +
  '#gm-playlist a:hover, #gm-playlist a:link {' +
  '   margin: 0;' +
  '   padding: 0;' +
  '   border: 0;' +
  '   text-decoration: none;' +
  '}' +
  '#gm-playlist img {' +
  '   position: fixed;' +
  '   z-index: 99999;' +
  '   top: 15px;' +
  '   right: 15px;' +
  '   margin: 5px;' +
  '   padding: 5px;' +
  '   color: #000;' +
  '   background-color: #eee;' +
  '   border: #000 1px solid;' +
  '}'
  );

})();