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var Scrobbler = Class.create({
  dev: {
    apiKey: '',
    apiSecret: '',
    apiURL: 'http://ws.audioscrobbler.com/2.0/?',
    apihsURL: 'http://post.audioscrobbler.com:80/?'
  },
  client: {
    name: 'tst',
    version: '1.0'
  }
});

Scrobbler.prototype.initialize = function(username, password) {
  console.log("Initializing Scrobbler");
  this.session(username, password);
};

Scrobbler.prototype.session = function(username, password) {
  var authToken = this.getAuthToken(username, password);
  var time = this.getTimestamp();
  var apiSig = this.getApiSig(authToken, username);

  console.log("Creating Session URL");
  var sessionURL = [this.dev.apiURL, 'method=auth.getMobileSession&username=', username, '&format=json', '&authToken=', authToken, '&api_key=', this.dev.apiKey, '&api_sig=', apiSig].join('');

  var session = new Ajax.Request(sessionURL, {
    method: 'get',
    onSuccess: this.handleSessionResponse.bind(this),
    onFailure: function() {
      throw "Failed getting session";
    }
  });
}

Scrobbler.prototype.handleSessionResponse = function(response) {
  console.log("Handling session response");
  var response = response.responseText.evalJSON();
  if (!response.error) {
    this.sessionName = response.session.name;
    this.sessionKey = response.session.key;
    sessionKey = response.session.key;
    this.handshake(this.sessionName, this.sessionKey);
  } else {
    throw "Error in session";
  }
};

Scrobbler.prototype.handshake = function(sessionName, sessionKey) {
  var time = this.getTimestamp();
  var token = this.getToken(time);

  console.log("Generating handshake URL");
  var handshakeURL = [this.dev.apihsURL, 'hs=true&p=1.2.1&c=', this.client.name, '&v=', this.client.version, '&u=', sessionName, '&t=', time, '&a=', token, '&api_key=', this.dev.apiKey, '&sk=', sessionKey].join('');

  var handshake = new Ajax.Request(handshakeURL, {
    method: 'get',
    onSuccess: this.handleHandshakeResponse.bind(this),
    onFailure: function() {
      throw "error getting handshake";
    }
  });
};

Scrobbler.prototype.handleHandshakeResponse = function(response) {
  console.log("Handling Hanshake response");
  console.log(response);
  var data = response.responseText.split("\n", 4);
  if (data[0] === "OK") {
    this.sessionID = data[1];
    this.npURL = data[2];
    this.sbURL = data[3];
  } else {
    this.handshake(this.sessionName, this.sessionKey);
    throw "Error in handshake. I'll try again.'"
  }
};

Scrobbler.prototype.notify = function(track) {
  console.log("Notifing last.fm of current playing song");
  var allVars = this.allVarsDefined();
  var isValid = this.isNotifySongValid(track);
  console.log(allVars);
  console.log(isValid);
  if (allVars && isValid) {
    var notifyURL = [this.npURL, '?', 's=', this.sessionID, '&a=', track.artist, //Required
    '&t=', track.name, //Required
    '&b=', track.album, '&l=', track.length, '&n=', track.number, '&m=', track.mbid].join('');

    var ajax = new Ajax.Request(notifyURL, {
      method: 'post',
      onSuccess: function(transport) {
        var response = transport.repsonseText;
        if (response === "OK\n") {
          console.log("Succssfully notified last.fm of the current playing song.");
        } else {
          console.log("Failed to notify last.fm of the current playing song.");
        }
      },
      onFailure: function() {
        throw "could not notify last.fm of the current playing song.";
      }
    })

  } else {
    if (!allVars) {
      //This is where the problem is
      //The Error: TypeError: Result of expression 'this.allVarsDefined' [undefined] is not a function.
      setTimeout(this.notify, 5000, track);
      throw "Not all the session and handshake variables are defined. I'll try again in five seconds.";
    }
    if (!isValid) {
      throw "you did not include all the information that is nessacary to notify last.fm of the current playing track";
    }
  }
};

/*
s=<sessionID> The Session ID string returned by the handshake request. Required.

a[0]=<artist> The artist name. Required.

t[0]=<track>  The track title. Required.

i[0]=<time>   The time the track started playing, in UNIX timestamp format (integer number of seconds since 00:00:00, January 1st 1970 UTC). 
							This must be in the UTC time zone, and is required.
							
o[0]=<source> The source of the track. Required, must be one of the following codes:
 						    P - Chosen by the user (the most common value, unless you have a reason for choosing otherwise, use this).
						    R - Non-personalised broadcast (e.g. Shoutcast, BBC Radio 1).
						    E - Personalised recommendation except Last.fm (e.g. Pandora, Launchcast).
						    L - Last.fm (any mode). In this case, the 5-digit Last.fm recommendation key must be appended to this 
										source ID to prove the validity of the submission (for example, "o[0]=L1b48a").
						    U - Source unknown.

r[0]=<rating> A single character denoting the rating of the track. Empty if not applicable.
    L - Love (on any mode if the user has manually loved the track). This implies a listen.
    B - Ban (only if source=L). This implies a skip, and the client should skip to the next track when a ban happens.
    S - Skip (only if source=L)

l[0]=<secs> The length of the track in seconds. Required when the source is P, optional otherwise.
b[0]=<album> The album title, or an empty string if not known.
n[0]=<tracknumber> The position of the track on the album, or an empty string if not known.
m[0]=<mb-trackid> The MusicBrainz Track ID, or an empty string if not known.
*/
Scrobbler.prototype.submission = function(track) {
  var valid = this.isSubmissionSongValid(track);
  console.log(valid);
  var submitURL = [this.sbURL, '?', 's=', this.sessionID, //Required
  '&a=', track.artist, //Required
  '&t=', track.name, //Required
  '&i=', track.time, //Required
  '&o=', track.source.toUpperCase(), //Required
  '&r=', track.rating.toUpperCase(), '&l=', track.length, //Required if source equals P
  '&b=', track.album, '&n=', track.number, '&m=', track.mbid].join('');

};

/*
HELPERS
*/
Scrobbler.prototype.allVarsDefined = function() {
  if (typeof this.sessionName !== "undefined" && typeof this.sessionName !== "undefined") {
    if (typeof this.sessionID !== "undefined" && typeof this.npURL !== "undefined" && typeof this.sbURL !== "undefined") {
      return true;
    } else {
      return false;
    }
  } else {
    return false;
  }
};

Scrobbler.prototype.isNotifySongValid = function(track) {
  if (track.artist === null || track.name === null) {
    return false;
  } else {
    return true;
  }
}

Scrobbler.prototype.isSubmissionSongValid = function(track) {
  if (track.length === null || track.length <= 30 && track.source.toLowerCase() === "p") {
    return false;
  } else {
    if (track.length <= 30) {
      return false;
    } else {
      if (track.artist == null || track.name === null || track.time === null || track.source === null) {
        return false;
      } else {
        return true;
      }
    }
  }
};

Scrobbler.prototype.getTimestamp = function() {
  console.log("Generating Timestamp");
  return parseInt(new Date().getTime().toString().substring(0, 10));
};

Scrobbler.prototype.getToken = function(timestamp) {
  console.log("Generating Token");
  return this.md5(this.dev.apiSecret + timestamp);
};

Scrobbler.prototype.getAuthToken = function(username, password) {
  console.log("Generating authToken");
  var authToken = this.md5(username + this.md5(password));
  return authToken;
};

Scrobbler.prototype.getApiSig = function(authToken, username) {
  console.log("Generateing API Signature");
  apiSignature = this.md5('api_key' + this.dev.apiKey + 'authToken' + authToken + 'methodauth.getMobileSession' + 'username' + username + this.dev.apiSecret);
  return apiSignature;
};

Scrobbler.prototype.md5 = function(string) {

  function RotateLeft(lValue, iShiftBits) {
    return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));
  }

  function AddUnsigned(lX, lY) {
    var lX4, lY4, lX8, lY8, lResult;
    lX8 = (lX & 0x80000000);
    lY8 = (lY & 0x80000000);
    lX4 = (lX & 0x40000000);
    lY4 = (lY & 0x40000000);
    lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF);
    if (lX4 & lY4) {
      return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
    }
    if (lX4 | lY4) {
      if (lResult & 0x40000000) {
        return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
      } else {
        return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
      }
    } else {
      return (lResult ^ lX8 ^ lY8);
    }
  }

  function F(x, y, z) {
    return (x & y) | ((~x) & z);
  }
  function G(x, y, z) {
    return (x & z) | (y & (~z));
  }
  function H(x, y, z) {
    return (x ^ y ^ z);
  }
  function I(x, y, z) {
    return (y ^ (x | (~z)));
  }

  function FF(a, b, c, d, x, s, ac) {
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
  };

  function GG(a, b, c, d, x, s, ac) {
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
  };

  function HH(a, b, c, d, x, s, ac) {
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
  };

  function II(a, b, c, d, x, s, ac) {
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
  };

  function ConvertToWordArray(string) {
    var lWordCount;
    var lMessageLength = string.length;
    var lNumberOfWords_temp1 = lMessageLength + 8;
    var lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64;
    var lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16;
    var lWordArray = Array(lNumberOfWords - 1);
    var lBytePosition = 0;
    var lByteCount = 0;
    while (lByteCount < lMessageLength) {
      lWordCount = (lByteCount - (lByteCount % 4)) / 4;
      lBytePosition = (lByteCount % 4) * 8;
      lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount) << lBytePosition));
      lByteCount++;
    }
    lWordCount = (lByteCount - (lByteCount % 4)) / 4;
    lBytePosition = (lByteCount % 4) * 8;
    lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition);
    lWordArray[lNumberOfWords - 2] = lMessageLength << 3;
    lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29;
    return lWordArray;
  };

  function WordToHex(lValue) {
    var WordToHexValue = "",
    WordToHexValue_temp = "",
    lByte, lCount;
    for (lCount = 0; lCount <= 3; lCount++) {
      lByte = (lValue >>> (lCount * 8)) & 255;
      WordToHexValue_temp = "0" + lByte.toString(16);
      WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length - 2, 2);
    }
    return WordToHexValue;
  };

  function Utf8Encode(string) {
    string = string.replace(/\r\n/g, "\n");
    var utftext = "";

    for (var n = 0; n < string.length; n++) {

      var c = string.charCodeAt(n);

      if (c < 128) {
        utftext += String.fromCharCode(c);
      }
      else if ((c > 127) && (c < 2048)) {
        utftext += String.fromCharCode((c >> 6) | 192);
        utftext += String.fromCharCode((c & 63) | 128);
      }
      else {
        utftext += String.fromCharCode((c >> 12) | 224);
        utftext += String.fromCharCode(((c >> 6) & 63) | 128);
        utftext += String.fromCharCode((c & 63) | 128);
      }

    }

    return utftext;
  };

  var x = Array();
  var k, AA, BB, CC, DD, a, b, c, d;
  var S11 = 7,
  S12 = 12,
  S13 = 17,
  S14 = 22;
  var S21 = 5,
  S22 = 9,
  S23 = 14,
  S24 = 20;
  var S31 = 4,
  S32 = 11,
  S33 = 16,
  S34 = 23;
  var S41 = 6,
  S42 = 10,
  S43 = 15,
  S44 = 21;

  string = Utf8Encode(string);

  x = ConvertToWordArray(string);

  a = 0x67452301;
  b = 0xEFCDAB89;
  c = 0x98BADCFE;
  d = 0x10325476;

  for (k = 0; k < x.length; k += 16) {
    AA = a;
    BB = b;
    CC = c;
    DD = d;
    a = FF(a, b, c, d, x[k + 0], S11, 0xD76AA478);
    d = FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756);
    c = FF(c, d, a, b, x[k + 2], S13, 0x242070DB);
    b = FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE);
    a = FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF);
    d = FF(d, a, b, c, x[k + 5], S12, 0x4787C62A);
    c = FF(c, d, a, b, x[k + 6], S13, 0xA8304613);
    b = FF(b, c, d, a, x[k + 7], S14, 0xFD469501);
    a = FF(a, b, c, d, x[k + 8], S11, 0x698098D8);
    d = FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF);
    c = FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1);
    b = FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE);
    a = FF(a, b, c, d, x[k + 12], S11, 0x6B901122);
    d = FF(d, a, b, c, x[k + 13], S12, 0xFD987193);
    c = FF(c, d, a, b, x[k + 14], S13, 0xA679438E);
    b = FF(b, c, d, a, x[k + 15], S14, 0x49B40821);
    a = GG(a, b, c, d, x[k + 1], S21, 0xF61E2562);
    d = GG(d, a, b, c, x[k + 6], S22, 0xC040B340);
    c = GG(c, d, a, b, x[k + 11], S23, 0x265E5A51);
    b = GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA);
    a = GG(a, b, c, d, x[k + 5], S21, 0xD62F105D);
    d = GG(d, a, b, c, x[k + 10], S22, 0x2441453);
    c = GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681);
    b = GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8);
    a = GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6);
    d = GG(d, a, b, c, x[k + 14], S22, 0xC33707D6);
    c = GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87);
    b = GG(b, c, d, a, x[k + 8], S24, 0x455A14ED);
    a = GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905);
    d = GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8);
    c = GG(c, d, a, b, x[k + 7], S23, 0x676F02D9);
    b = GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A);
    a = HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942);
    d = HH(d, a, b, c, x[k + 8], S32, 0x8771F681);
    c = HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122);
    b = HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C);
    a = HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44);
    d = HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9);
    c = HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60);
    b = HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70);
    a = HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6);
    d = HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA);
    c = HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085);
    b = HH(b, c, d, a, x[k + 6], S34, 0x4881D05);
    a = HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039);
    d = HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5);
    c = HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8);
    b = HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665);
    a = II(a, b, c, d, x[k + 0], S41, 0xF4292244);
    d = II(d, a, b, c, x[k + 7], S42, 0x432AFF97);
    c = II(c, d, a, b, x[k + 14], S43, 0xAB9423A7);
    b = II(b, c, d, a, x[k + 5], S44, 0xFC93A039);
    a = II(a, b, c, d, x[k + 12], S41, 0x655B59C3);
    d = II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92);
    c = II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D);
    b = II(b, c, d, a, x[k + 1], S44, 0x85845DD1);
    a = II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F);
    d = II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0);
    c = II(c, d, a, b, x[k + 6], S43, 0xA3014314);
    b = II(b, c, d, a, x[k + 13], S44, 0x4E0811A1);
    a = II(a, b, c, d, x[k + 4], S41, 0xF7537E82);
    d = II(d, a, b, c, x[k + 11], S42, 0xBD3AF235);
    c = II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB);
    b = II(b, c, d, a, x[k + 9], S44, 0xEB86D391);
    a = AddUnsigned(a, AA);
    b = AddUnsigned(b, BB);
    c = AddUnsigned(c, CC);
    d = AddUnsigned(d, DD);
  }

  var temp = WordToHex(a) + WordToHex(b) + WordToHex(c) + WordToHex(d);

  return temp.toLowerCase();
};

/*
MAIN For Testing
*/
window.onload = function() {
  var scrob = new Scrobbler('username', 'password');
  var song = {
    artist: "Justice",
    name: "Stress",
    time: scrob.getTimestamp() - 208,
    source: 'P',
    length: "208"
  };
  scrob.notify(song);
};