//Encoding / Decoding
// Decode an encoded string into a list of VE lat/lng.
function decodeLine(encoded) {
    var len = encoded.length;
    var index = 0;
    var array = [];
    var lat = 0;
    var lng = 0;
    try
    {
        while (index < len) {
            var b;
            var shift = 0;
            var result = 0;
            do {
                  b = encoded.charCodeAt(index++) - 63;
                  result |= (b & 0x1f) << shift;
                  shift += 5;
            } while (b >= 0x20);
            var dlat = ((result & 1) ? ~(result >> 1) : (result >> 1));
            lat += dlat;

            shift = 0;
            result = 0;
            do {
                  b = encoded.charCodeAt(index++) - 63;
                  result |= (b & 0x1f) << shift;
                  shift += 5;
            } while (b >= 0x20);
            var dlng = ((result & 1) ? ~(result >> 1) : (result >> 1));
            lng += dlng;

            array.push(new VELatLong((lat * 1e-5), (lng * 1e-5)));
        }
    } catch(ex)
    {
        //error in encoding.
    }
    return array;
}  

// Decode an encoded string into an array of pushpin types.
function decodeTypes(encoded) {
    var levels = [];
    for (var pointIndex = 0; pointIndex < encoded.length; ++pointIndex) {
        var pointLevel = encoded.charCodeAt(pointIndex) - 63;
        levels.push(pointLevel);
    }
    return levels;
}

// Encode a signed number in the encode format.
function encodeSignedNumber(num) {
  var sgn_num = num << 1;

  if (num < 0) {
    sgn_num = ~(sgn_num);
  }

  return(encodeNumber(sgn_num));
}

// Encode an unsigned number in the encode format.
function encodeNumber(num) {
  var encodeString = "";

  while (num >= 0x20) {
    encodeString += (String.fromCharCode((0x20 | (num & 0x1f)) + 63));
    num >>= 5;
  }

  encodeString += (String.fromCharCode(num + 63));
  return encodeString;
}

// Create the encoded bounds.
function createEncodings(points) {
  var i = 0;
  var plat = 0;
  var plng = 0;
  var encoded_points = "";

  for(i = 0; i < points.length; ++i) {
    var point = points[i];
    var lat = point.Latitude;
    var lng = point.Longitude;

    var late5 = Math.floor(lat * 1e5);
    var lnge5 = Math.floor(lng * 1e5);

    dlat = late5 - plat;
    dlng = lnge5 - plng;

    plat = late5;
    plng = lnge5;

    encoded_points += encodeSignedNumber(dlat) + encodeSignedNumber(dlng);
  } 
  return encoded_points;
}

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