// check which browser is running
var userAgent = navigator.userAgent.toLowerCase();
var appVersion = navigator.appVersion.toLowerCase();
var appName = navigator.appName.toLowerCase();

// operating system and browser information
var isWin = (appVersion.indexOf('windows') != -1);
var isOpera = (userAgent.indexOf('opera') != -1);
var isIE = (appName.indexOf('internet explorer') != -1) && !isOpera;
var isSafari = (userAgent.indexOf('applewebkit') != -1);
var isMozilla = (appName.indexOf('netscape') != -1) && !isSafari;

function getElementsByTagNameAttributeValue(ancestorEl, tagName, attrName, attrValue) {
  if (typeof (attrValue) == "undefined")
    attrValue = null;

  var els = [];
  var a = ancestorEl.getElementsByTagName(tagName);
  for (var i = 0; i < a.length; i++) {
    var el = a[i];
    switch (attrName) {
      case "className":
      case "class":
        //if (el.className.indexOf(attrValue) != -1)
        if (Spif.ClassNameAbstraction.contains(el, attrValue))
          els.push(el);
        break;
      default:
        var val = el.getAttribute(attrName);
        if ((val != null) && ((attrValue == null) || (val == attrValue)))
          els.push(el);
    }
  }
  return els;
};

var asyncRequest = function () {
  function handleReadyState(o, callback) {
    var poll = window.setInterval(function () {
      if (o && o.readyState == 4) {
        window.clearInterval(poll);
        if (callback) {
          callback(o);
        }
      }
    },
    50);
  }
  var http;
  try {
    http = new XMLHttpRequest();
  }
  catch (e) {
    var msxml = [
      'MSXML2.XMLHTTP.3.0',
      'MSXML2.XMLHTTP',
      'Microsoft.XMLHTTP'
    ];
    for (var i = 0, len = msxml.length; i < len; ++i) {
      try {
        http = new ActiveXObject(msxml[i]);
        break;
      }
      catch (e) { }
    }
  }
  return function (method, uri, callback, postData) {
    http.open(method, uri, false);
    handleReadyState(http, callback);
    http.send(postData || null);
    return http;
  };
} ();


function initXML(xmlString) {
  if (window.ActiveXObject) {
    var doc = new ActiveXObject("Microsoft.XMLDOM");
    doc.async = "false";
    doc.loadXML(xmlString);
    return doc;
  }
  else {
    var parser = new DOMParser();
    var doc = parser.parseFromString(xmlString, "text/xml");
    return doc;
  }
};


// check for XPath implementation 
if (document.implementation.hasFeature("XPath", "3.0")) {
  // prototying the XMLDocument 
  XMLDocument.prototype.selectSingleNode = function (cXPathString, xNode) {
    if (!xNode) { xNode = this; }
    var xItems = this.selectNodes(cXPathString, xNode);

    if (xItems.length > 0)
      return xItems[0];
    else
      return null;
  }

  // prototying the Element 
  Element.prototype.selectSingleNode = function (cXPathString) {
    if (this.ownerDocument.selectSingleNode)
      return this.ownerDocument.selectSingleNode(cXPathString, this);
    else
      throw "For XML Elements Only";
  }
}

if (document.implementation.hasFeature("XPath", "3.0")) {
  // prototying the XMLDocument 
  XMLDocument.prototype.selectNodes = function (cXPathString, xNode) {
    if (!xNode) { xNode = this; }
    var oNSResolver = this.createNSResolver(this.documentElement)
    var aItems = this.evaluate(cXPathString, xNode, oNSResolver,
                 XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null)
    var aResult = [];
    for (var i = 0; i < aItems.snapshotLength; i++) {
      aResult[i] = aItems.snapshotItem(i);
    }
    return aResult;
  }

  // prototying the Element 
  Element.prototype.selectNodes = function (cXPathString) {
    if (this.ownerDocument.selectNodes) {
      return this.ownerDocument.selectNodes(cXPathString, this);
    }
    else { throw "For XML Elements Only"; }
  }
}

function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

function getRandomDec(min, max) {
  return (Math.random() * (max - min + 1)) + min;
}

function newModifier() {
  var modifier = new Spif.Modifiers();
  modifier.duration = getRandomInt(2000, 3500);
  modifier.repeat = true;
  modifier.profile = modifier.RETURN;
  return modifier;
}

function quekInit() {
  if (!flashEnabled()) {
    alert('Je moet Flash versie 9 of hoger geinstalleerd hebben om gebruik te kunnen maken van Quek.');
    window.location.href = "/overdekindertelefoon/quekhelp";
  }
  else if (QuekController.isSignedOn()) {
    QuekController.signOff();
  }
  else {
    Spif.show(document.getElementById('quekSettings'));
  }
  return false;
}

function flashEnabled() {
  try {
    if (!FlashDetect.installed)
      return false
    else if (FlashDetect.major < 9)
      return false
    else
      return true;
  }
  catch (err) {
    return true;
  }
}

function toggleChat(checked) {
  if (checked)
    Spif.ClassNameAbstraction.replace(getEl('chatframe'), 'hidden', '')
  else
    Spif.ClassNameAbstraction.add(getEl('chatframe'), 'hidden');

  return false;
}

function getEl(id) {
  return document.getElementById(id);
}