/*
  SOS-CMS general JavaScript function library
  mostly by raezr
  http://tankadillo.com/sos-cms
*/
/*
  there are probably some better functions I could add here
*/
var global =
{
  loadingElement : '#loadingMessage',
  errorContainer : '#errorCenter',
  errorText : '#errorText',
  
  loading : function(message)
  {
    message = !message ? 'loading...' : message;
    window.onload = this.loaded;
    if( $(this.loadingElement) )
      $(this.loadingElement).textContent = message;
  },
  
  loaded : function()
  {
    if( $(global.loadingElement) ) // you have to use 'global' here instead of 'this' because it's put inside the window object
      $(global.loadingElement).textContent = '';
  },
  
  error : function(message)
  {
    message = !message ? 'something happened' : message;
    if( $(this.errorContainer) && $(this.errorText) )
    {
      $(this.errorContainer).style.display = 'block';
      $(this.errorText).textContent = message;
    }
  }
}

/*
  This is mostly copied from Prototype (http://prototypejs.org/) but modified
  slightly. Instead of having a seperate function for getting elements by ID, 
  class, or tag name I've put it all inside one function. Prefix an ID with "#",
  a class with ".", and a tag name needs no prefix.
*/
function $()
{
  var elements = new Array;
  for (var i = 0; i < arguments.length; i++)
  {
    var element = arguments[i];
    if (typeof element == 'string')
    {
      switch (element[0])
      {
        case '#':
          element = document.getElementById(element.replace('#',''));
          break;
        case '.':
          element = getElementsByClassName(element.replace('.',''));
          break;
        default:
          element = document.getElementsByTagName(element);
          break;
      } 
    }
    if (arguments.length == 1)
      return element;
    elements.push(element);
  }
  return elements;
}

function getElementsByClassName(searchClass,node,tag)
{
  var classElements = new Array;
  if ( node == null )
    node = document;
  if ( tag == null )
    tag = '*';
  var els = node.getElementsByTagName(tag);
  var elsLen = els.length;
  var pattern = new RegExp("(^|\\\\s)" + searchClass + "(\\\\s|$)");
  for (i=0, j=0; i<elsLen; i++)
  {
    if ( pattern.test(els[i].className) )
    {
      classElements[j] = els[i];
      j++;
    }
  }
  return classElements;
}

function switchVisible(id1,id2,display)
{
  display = !display ? 'block' : display;
  var el1 = document.getElementById(id1);
  var el2 = document.getElementById(id2);
  
  if( el1.style.display == 'none' )
  {
    el1.style.display = display;
    el2.style.display = 'none';
  }
  else
  {
    el2.style.display = display;
    el1.style.display = 'none';
  }
}

function toggleId(id,display)
{
  display = !display ? 'block' : display;
  var sid = document.getElementById(id);  
  sid.style.display = (sid.style.display == 'none') ? display : 'none';
}

function resizeField(addh,area)
{
  var box = document.getElementById(area);
  var cur_height = parseInt(box.rows) ? parseInt( box.rows ) : 10;
  var new_height = cur_height + addh;
  
  if (new_height > 0)
    box.rows = new_height;
}

function checkboxDisableText(checkBox,textBoxId)
{
  var textBox = document.getElementById(textBoxId);
  
  if(checkBox.checked == true)
    textBox.disabled = true;
  else
    textBox.disabled = false;
}

/*
* ------------------------------
* SHA-1 functions
* http://www.movable-type.co.uk/scripts/sha1.html
* ------------------------------
*/
/*
* use this function to (more) securely submit passwords
*/
function sha1Hash(msg)
{
  // constants [§4.2.1]
  var K = [0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6];
  // PREPROCESSING 
  msg += String.fromCharCode(0x80); // add trailing '1' bit to string [§5.1.1]
  // convert string msg into 512-bit/16-integer blocks arrays of ints [§5.2.1]
  var l = Math.ceil(msg.length/4) + 2;  // long enough to contain msg plus 2-word length
  var N = Math.ceil(l/16);              // in N 16-int blocks
  var M = new Array(N);
  for (var i=0; i<N; i++)
  {
    M[i] = new Array(16);
    
    for (var j=0; j<16; j++)  // encode 4 chars per integer, big-endian encoding
      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));
  }
  
  // add length (in bits) into final pair of 32-bit integers (big-endian) [5.1.1]
  // note: most significant word would be ((len-1)*8 >>> 32, but since JS converts
  // bitwise-op args to 32 bits, we need to simulate this by arithmetic operators
  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;
  // set initial hash value [§5.3.1]
  var H0 = 0x67452301;
  var H1 = 0xefcdab89;
  var H2 = 0x98badcfe;
  var H3 = 0x10325476;
  var H4 = 0xc3d2e1f0;
  // HASH COMPUTATION [§6.1.2]
  var W = new Array(80); var a, b, c, d, e;
  for (var i=0; i<N; i++)
  {
    // 1 - prepare message schedule 'W'
    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);
    
    // 2 - initialise five working variables a, b, c, d, e with previous hash value
    a = H0; b = H1; c = H2; d = H3; e = H4;
    // 3 - main loop
    for (var t=0; t<80; t++)
    {
      var s = Math.floor(t/20); // seq for blocks of 'f' functions and 'K' constants
      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;
    }
    // 4 - compute the new intermediate hash value
    H0 = (H0+a) & 0xffffffff;  // note 'addition modulo 2^32'
    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' [§4.1.1]
//
function f(s, x, y, z) 
{
  switch (s)
  {
    case 0: return (x & y) ^ (~x & z);           // Ch()
    case 1: return x ^ y ^ z;                    // Parity()
    case 2: return (x & y) ^ (x & z) ^ (y & z);  // Maj()
    case 3: return x ^ y ^ z;                    // Parity()
  }
}

//
// rotate left (circular left shift) value x by n positions [§3.2.5]
//
function ROTL(x, n)
{
  return (x<<n) | (x>>>(32-n));
}

// extend Number class with a tailored hex-string method 
//   (note toString(16) is implementation-dependant, and 
//   in IE returns signed numbers when used on full words)
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;
}

RegExp.prototype.addFlag = function(newFlag)
{
  var parts = this.toString().split('/');
  var flags = parts[parts.length - 1];
  var body = this.toString().match(/^\/(.*)\//)[1];
  return new RegExp(body, flags + newFlag);
}

RegExp.prototype.clearFlags = function()
{
  return new RegExp(
    this.toString().match(/^\/(.*)\//)[1] );
}

Math.roundDecimal = function(number, decimals)
{
  var multiple = this.pow(10,decimals);
  return (this.round(number * multiple) / multiple);
}