var crypto = require('crypto');

function sha1hexFromString(src){
  var sha1hash = crypto.createHash('sha1');
  sha1hash.update(src, 'binary');
  return sha1hash.digest('hex');
}

function arrayFromHexString(hexstr){
  var r = [];
  for(var i=0,j=hexstr.length; i<j; i++){
    r.push(parseInt(hexstr[i], 16));
  }
  return r;
}

function configFromArray(arr){
  var nodes = [];
  for(var i=8,j=arr.length; i<j; i+=2){
    nodes.push(arr[i] + arr[i+1]);
  }
  return {
    red: arr[0] * 16 + arr[4],
    green: arr[1] * 16 + arr[5],
    blue: arr[2] * 16 + arr[6],
    alpha: arr[3] * 16 + arr[7],
    nodes: nodes
  };
}

function svgFromConfig(config, width, height){
  width = width || config.width || 64;
  height = height || config.height || 64;
  var color = 'rgba(' + [config.red, config.green, config.blue, config.alpha].join(', ') + ')';
  var buf = [];

  var scaleX = width / 256;
  var scaleY = height / 256;

  buf.push('<svg width="'+width+'" height="'+height+'">');
  buf.push('<g transform="scale('+ scaleX + ',' + scaleY + ')">');
  var nodes = config.nodes;
  for(var i=0, j=nodes.length; i<j; i++){
    var size = nodes[i] * 2;
    var delta = 32 - nodes[i];
    var x = (Math.floor(i % 4) * 64) + delta;
    var y = (Math.floor(i / 4) * 64) + delta;
    buf.push('<rect width="'+ size + '" height="'+ size +'" fill="' + color + '" x="' + x + '" y="' + y + '">');
    buf.push('</rect>');
  }
  buf.push('</g>');
  buf.push('</svg>');
  return buf.join('\n');
}

// console.log(sha1hexFromString('hmm'));
// console.log(arrayFromHexString(sha1hexFromString('hmm')));

var candidates = [
  "a",
  "b",
  "c",
  "memo",
  "test",
  "foo",
  "memo1",
  "memo2",
  "memo3",
  "memo4",
  "memo5",
  "memo6",
  "memo7",
  "memo8",
  "memo9",
  "memo10",
  "memo11",
  "memo12",
  "memo13",
  "memo14",
  "memo15",
  "memo16",
  "memo17",
  "memo18",
  "memo19",
  "memo110"
];

console.log("<table>");
candidates.forEach(function(s){
  console.log("<tr>");
  console.log("<td>");
  console.log(s);
  console.log("</td>");
  console.log("<td>");
  console.log(
    svgFromConfig(
      configFromArray(
        arrayFromHexString(
          sha1hexFromString(s)))));
  console.log("</td>");
  console.log("<tr>");
});
console.log("</table>");