var CHUNKS = 250;
var CHUNK_TIMEOUT = 1;
var SERVER = "";

var again = 0;
var startTime;
var processed = 0;
var statInterval;
var stopped = false;
var myBest = 160;
var ratesHis = [];
var matches = {};

function start() {
  // console.log(data);
  var best = data.best;
  var key = data.sha;
  var wordList = data.words;
  startTime = (new Date()).getTime();
  $("#all-best .data").text(best);
  
  function compute() {
    wordList.sort(randOrd);
    var append = [97, 97, 97, 97];
    var words = wordList.join(" ") + " ";
    
    
    function nextGroup() {
      // console.log("nextGroup");
      var ii = 0;
      
      while (append[0] < 123) {
        while (append[1] < 123) {
          while (append[2] < 123) {
            while (append[3] < 123) {
              var phrase = words + String.fromCharCode.apply(this, append);
              var sha1 = sha1Hash(phrase);
              var distance = hamming(sha1, key);
              
              if (!matches[distance])
                matches[distance] = 0;
              
              matches[distance]++
              // New Personal Best
              if (distance < myBest) {
                myBest = distance;
                $("#my-best .data").text(myBest);
              }
              
              if (distance < best) {
                best = distance;
                $('body').append("<img src='" + SERVER + "/new-best?phrase=" + escape(phrase) + "' />");
              }
              
              processed++;
              
	      if (processed % 25000 == 0) {
		pageTracker._trackEvent("processed", "proc", "proc", 25000);
	      }

              append[3]++;
              if (ii++ > CHUNKS) {
                if (!stopped)
                  setTimeout(nextGroup, CHUNK_TIMEOUT);
                return;
              }
            }
            append[3] = 97;
            append[2]++;
          }
          append[2] = 97;
          append[1]++;
        }
        append[1] = 97;
        append[0]++;
      }
      
      setTimeout(compute, 1);
    }
    
    nextGroup();
  }
  
  statInterval = setInterval(stats, 2000);
  //setTimeout(compute, 5);
  compute();
};


function stats() {
  var nowDiff = (new Date()).getTime() - startTime;
  var perSec = Math.floor(processed/nowDiff*1000);
  
  $("#total-processed .data").text(processed);
  $("#rate .data").text(perSec);
  
  if (perSec > 1)
    ratesHis.push(perSec);
  if (ratesHis.length > 20)
    ratesHis = ratesHis.slice(1);
  
  renderChart(ratesHis);
  renderBarGraph(matches);
  //console.log("Proccessed: ", processed, "Approx: ", Math.floor(processed/nowDiff*1000), "a second.");
}

function stop() {
  stopped = true;
  clearInterval(statInterval);
  stats();
}


// Chart Functions

var historicLow = 10000;
function renderChart(ratesSafe) {
    var rates = [];
    $.each(ratesSafe, function(i, val) {
        rates[i] = val / 10;
    });

    var e_rates = rates.slice();
    var max = Math.round(rates.sort()[rates.length - 1] + .2);
    var min = rates.sort()[0] - .2;
    if (min < historicLow)
      historicLow = min;
    historicLow = Math.round(historicLow);

    var chart_wrap = $('#rate-chart');
    var chart = $('<img src="http://chart.apis.google.com/chart?chds=' + historicLow + ',' + max + '&chxt=y&chxs=0,777777,11,0,l&chxr=0,' + historicLow * 10 + ',' + max * 10 + ',&chxl=0:|' + historicLow * 10 + '|' + max * 10 + '&cht=ls&chs=840x150&chd=t:' + e_rates.toString() + '" />');
    var imgs = $('#rate-chart img');
    imgs.slice(0, imgs.length-1).remove();
    img = null;

    chart_wrap.append(chart);
}

function renderBarGraph(raw_data) {
      var data = [];
      var data_s = [];
      var total = 0;

      data[0] = (raw_data[0] || 0);

      for(var i = 1; i < 161; i++) {
          if(i % 5 == 0) {
              data.push(total);
              total = 0;
          }
          total = total + (raw_data[i] || 0);
      }

      $.each(data, function(i, val) {
          data_s[i] = val / 1000000;
      });

      var data_c = data_s.slice();
      var max = data_c.sort()[data_c.length - 1];

      var bar_wrap = $('#dist-chart');
      var bar = $('<img src="http://chart.apis.google.com/chart?cht=bvs&chs=840x150&chxtc=1,0|0,0&chxs=0,777777,11,0,t|1,FFFFFF,0,0,t&chxl=0:|0||10||20||30||40||50||60||70||80||90||100||120||130||140||150||160&chxt=x,y&chds=0,' + max + '&chd=t:' + data_s.toString() + '" />');
      
      var imgs = $('#dist-chart img');
      imgs.slice(0, imgs.length-1).remove();
      img = null;
      
      bar_wrap.append(bar);
}


//
//  Util Functions
//

function randOrd(){
  return (Math.round(Math.random())-0.5);
}

function sha1Hash(msg)
{
    var K = [0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6];

    msg += String.fromCharCode(0x80);

    var l = Math.ceil(msg.length/4) + 2;
    var N = Math.ceil(l/16);
    var M = new Array(N);
    for (var i=0; i<N; i++) {
        M[i] = new Array(16);
        for (var j=0; j<16; j++) {
            M[i][j] = (msg.charCodeAt(i*64+j*4)<<24) | (msg.charCodeAt(i*64+j*4+1)<<16) | 
                      (msg.charCodeAt(i*64+j*4+2)<<8) | (msg.charCodeAt(i*64+j*4+3));
        }
    }
    M[N-1][14] = ((msg.length-1)*8) / Math.pow(2, 32); M[N-1][14] = Math.floor(M[N-1][14])
    M[N-1][15] = ((msg.length-1)*8) & 0xffffffff;

    var H0 = 0x67452301;
    var H1 = 0xefcdab89;
    var H2 = 0x98badcfe;
    var H3 = 0x10325476;
    var H4 = 0xc3d2e1f0;

    var W = new Array(80); var a, b, c, d, e;
    for (var i=0; i<N; i++) {

        for (var t=0;  t<16; t++) W[t] = M[i][t];
        for (var t=16; t<80; t++) W[t] = ROTL(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1);

        a = H0; b = H1; c = H2; d = H3; e = H4;

        for (var t=0; t<80; t++) {
            var s = Math.floor(t/20);
            var T = (ROTL(a,5) + f(s,b,c,d) + e + K[s] + W[t]) & 0xffffffff;
            e = d;
            d = c;
            c = ROTL(b, 30);
            b = a;
            a = T;
        }

        H0 = (H0+a) & 0xffffffff;
        H1 = (H1+b) & 0xffffffff; 
        H2 = (H2+c) & 0xffffffff; 
        H3 = (H3+d) & 0xffffffff; 
        H4 = (H4+e) & 0xffffffff;
    }

    return H0.toHexStr() + H1.toHexStr() + H2.toHexStr() + H3.toHexStr() + H4.toHexStr();
}

function f(s, x, y, z) 
{
    switch (s) {
    case 0: return (x & y) ^ (~x & z);         
    case 1: return x ^ y ^ z;                  
    case 2: return (x & y) ^ (x & z) ^ (y & z);
    case 3: return x ^ y ^ z;                  
    }
}

function ROTL(x, n)
{
    return (x<<n) | (x>>>(32-n));
}

Number.prototype.toHexStr = function()
{
    var s="", v;
    for (var i=7; i>=0; i--) { v = (this>>>(i*4)) & 0xf; s += v.toString(16); }
    return s;
}

hexLookup = {
  "0": "0000",
  "1": "0001",
  "2": "0010",
  "3": "0011",
  "4": "0100",
  "5": "0101",
  "6": "0110",
  "7": "0111",
  "8": "1000",
  "9": "1001",
  "a": "1010",
  "b": "1011",
  "c": "1100",
  "d": "1101",
  "e": "1110",
  "f": "1111"
};


function hamming(sha1, sha2) {
  var dist = 0;
  for (var i = 0; i < 40; i++) {
    var b1 = hexLookup[sha1.charAt(i)];
    var b2 = hexLookup[sha2.charAt(i)];
    
    for (var ii = 0; ii < 4; ii++) {
      if (b1.charAt(ii) != b2.charAt(ii))
        dist++;
    }
  }
  
  return dist;
}


start();
/*
console.log(
  sha1Hash("you year utility rate frank frank hello power hello golden power frank acii"),
  sha1Hash("I am not a big believer in fortune telling"),
  hamming(
    sha1Hash("you year utility rate frank frank hello power hello golden power frank acii"),
    sha1Hash("I am not a big believer in fortune telling")
  )
);


console.log("Should be 75")
*/