/*
bugmenot.js
 
Queries bugmenot.com for the current page, populates login information and submits.
Written by Victor Shih (vshih at yahoo.com, http://blog.vicshih.com/2009/04/bugmenot-command-for-ubiquity.html)
 
Initial idea and some code from Onur Yalazı (onur@yalazi.org, http://www.yalazi.org/ubiquity) and Brandon Goldsworthy.
*/
const MIN_RATE_PERCENT = 50; // only show entries that rate 50% or more
 
CmdUtils.CreateCommand({
  names:        ['bugmenot'],
  icon:         'http://www.bugmenot.com/favicon.gif',
  homepage:     'http://blog.vicshih.com/2009/04/bugmenot-command-for-ubiquity.html',
  author:       {name: 'Victor Shih', email: 'vshih at yahoo.com'},
  license:      'MPL',
  description:  'Queries bugmenot.com for the current page, populates login information and submits.',
  help:         'Enter the desired index of the bugmenot.com entry; defaults to top entry.',
 
  arguments: [ {role: 'object', nountype: /\d*/, label: 'entry number'} ],
 
  preview: function(pblock, args) {
    var url = this._getUrl();
 
    pblock.innerHTML = 'Passwords for ' + url + ':<br />';
 
    this._showEntries(pblock, url, args.object.text);
  },
 
  execute: function(args) {
    var url = this._getUrl();
 
    var entryID = parseInt(args.object.text) - 1;
    if (isNaN(entryID)) entryID = 0;
 
    var proxy = this;
 
    this._getEntries(url, function(entries) {
      if (entries.length == 0) {
        displayMessage(_('Bugmenot.com - no entries found.'));
        return;
      }
 
      if (entryID >= entries.length) entryID = entries.length - 1;
 
      proxy._submit(entries[entryID]);
    });
  },
 
  // Private members
  _entries: {},
 
  _decode: function(data, key) {
    var b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
    var o11 = '', o21 = '', o31 = '';
    var h11 = '', h21 = '', h31 = '', h41 = '';
    var bits1 = '', i1 = 0, enc1 = '';
 
    do {
      h11 = b64.indexOf(data.charAt(i1++));
      h21 = b64.indexOf(data.charAt(i1++));
      h31 = b64.indexOf(data.charAt(i1++));
      h41 = b64.indexOf(data.charAt(i1++));
      bits1 = h11 << 18 | h21 << 12 | h31 << 6 | h41;
      o11 = bits1 >> 16 & 255;
      o21 = bits1 >> 8 & 255;
      o31 = bits1 & 255;
      if (h31 == 64) {
        enc1 += String.fromCharCode(o11);
      }
      else if (h41 == 64) {
        enc1 += String.fromCharCode(o11, o21);
      }
      else {
        enc1 += String.fromCharCode(o11, o21, o31);
      }
    }
    while (i1 < data.length);
 
    var strInput = enc1;
    var strOutput = '';
    var intOffset = (key + 112) / 12;
 
    for (i1 = 4; i1 < strInput.length; ++i1) {
      var thisLetter = strInput.charAt(i1);
      var thisCharCode = strInput.charCodeAt(i1);
      var newCharCode = thisCharCode - intOffset;
      strOutput += String.fromCharCode(newCharCode);
    }
 
    return strOutput;
  },
 
  _getUrl: function() {
    var url = Application.activeWindow.activeTab.document.location.toString();
    var i = url.indexOf('://');
    if (i != -1) url = url.substr(i + 3);
    var i = url.indexOf('/');
    if (i != -1) url = url.substr(0, i);
    return url;
  },
 
  _getEntries: function(url, callback) {
    if (this._entries[url]) {
      callback.call(this, this._entries[url]);
    }
    else {
      var proxy = this;
 
      jQuery.ajax({
          url: 'http://www.bugmenot.com/view/' + url,
          success: function(html) {
            var key = parseInt(html.match(/key.=.(-?[0-9]*)/)[1]);
            var ps = html.split('<div class="account"');
 
            var result = [];
 
            for (var i = 0; i < ps.length; ++i) {
              var pair = ps[i].match(/d\('(.*)'\)/g);
 
              if (!pair) continue;
 
              var rate = parseInt(ps[i].match(/[0-9]{1,3}%/));
 
              if (rate < MIN_RATE_PERCENT) continue;
 
              var username = proxy._decode(pair[0].match(/'(.*)'/)[1], key);
              var password = proxy._decode(pair[1].match(/'(.*)'/)[1], key);
 
              result.push({username: username, password: password, rate: rate});
            }
 
            proxy._entries[url] = result;
 
            callback.call(proxy, result);
          },
        error: function() {
          // The ajax call seems to fail when there are no bugmenot entries found.
          // In this case, none of the parameters are informative, so just callback with no entries
          callback.call(proxy, []);
        }
      });
    }
  },
 
  _showEntries: function(pblock, url, entryID) {
    var proxy = this;
 
    this._getEntries(url, function(entries) {
      if (entries.length == 0) {
        pblock.innerHTML += 'No entries found.';
        return;
      }
 
      for (var i = 0; i < entries.length; ++i) {
        proxy._showEntry(pblock, i, entries[i], entryID);
      }
    });
  },
 
  _showEntry: function(pblock, i, entry, entryID) {
    var index = (i + 1).toString();
    var style = (entryID == index) ? 'style="background-color: green"' : '';
    pblock.innerHTML += '<div ' + style + '>' + index + (index.length == 1 ? '&nbsp;' : '') + ' ' + entry.username +
      ' <span style="color: gray">' + entry.password + '</span> ' + entry.rate + '%</div>';
  },
 
  _submit: function(entry) {
    var ins = jQuery(CmdUtils.getDocument()).find(':text,:password');
 
    var pass = ins.filter(':password:eq(0)');
    ins.slice(0, ins.index(pass)).filter(':text:last').val(entry.username);
    pass.val(entry.password)[0].form.submit();
  }
});