/* chatURL - URL for updating chat messages */
var xmlHttpGetMessages = createXmlHttpRequestObject();
var xmlHttpUpdateMessages = createXmlHttpRequestObject();
var rURL = "modules/calendar/result.php"; 
var showErrors = true;

/* creates an XMLHttpRequest instance */
function createXmlHttpRequestObject() 
{
  // will store the reference to the XMLHttpRequest object
  var xmlHttp;
  // this should work for all browsers except IE6 and older
  try
  {
    // try to create XMLHttpRequest object
    xmlHttp = new XMLHttpRequest();
  }
  catch(e)
  {
    // assume IE6 or older
    var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0",
                                    "MSXML2.XMLHTTP.5.0",
                                    "MSXML2.XMLHTTP.4.0",
                                    "MSXML2.XMLHTTP.3.0",
                                    "MSXML2.XMLHTTP",
                                    "Microsoft.XMLHTTP");
    // try every prog id until one works
    for (var i=0; i<XmlHttpVersions.length && !xmlHttp; i++) 
    {
      try 
      { 
        // try to create XMLHttpRequest object
        xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
      } 
      catch (e) {}
    }
  }
  // return the created object or display an error message
  if (!xmlHttp)
    alert("Error creating the XMLHttpRequest object.");
  else 
    return xmlHttp;
}

function displayError($message)
{
  // ignore errors if showErrors is false
  if (showErrors)
  {
    // turn error displaying Off
    showErrors = false;
    // display error message
    alert("Error encountered: \n" + $message);
  }
}

// Processes server's response
function displayFeed(outputDiv)
{
  // read server response as text, to check for errors 
  var response = xmlHttpGetMessages.responseText;

  var output = window.parent.document.getElementById(outputDiv);

  // server error?
  if (response.indexOf("ERRNO") >= 0 
      || response.indexOf("error:") >= 0
      || response.length == 0)
    throw(response.length == 0 ? "Void server response." : response);

  // append XSLed XML content to existing DOM structure

  output.innerHTML = response;
 
}


// function that retrieves the HTTP response
function handleHttpGetFeeds(outputDiv) 
{

  // request in progress
  if (xmlHttpGetMessages.readyState == 1){
     //
  }
  
  // continue if the process is completed
  if (xmlHttpGetMessages.readyState == 4) 
  {
   // continue only if HTTP status is "OK"
    if (xmlHttpGetMessages.status == 200) 
    {
      try
      {
        displayFeed(outputDiv);
      }
      catch(e)
      {
        // display error message
        displayError(e.toString());
      }
    } 
    else 
    {
      displayError(xmlHttpGetMessages.statusText);
    }
  }
}


// Retrieve titles from a feed and display them
function AjaxMakeReservation(outputDiv)
{

   var output = document.getElementById(outputDiv);
   var yyyy   = document.getElementById('yyyy').value;
   var mm     = document.getElementById('mm').value;
   var dd     = document.getElementById('dd').value;
   var timeframe   = document.getElementById('allcheckedcells').value;
   var meno        = document.getElementById('meno').value;
   var priezvisko  = document.getElementById('priezvisko').value;
   var email       = document.getElementById('email').value;
   var tel         = document.getElementById('tel').value;
   
  // only continue if xmlHttp isn't void
  if (xmlHttpGetMessages)
  {
	// try to connect to the server
    try
    {
      if (xmlHttpGetMessages.readyState == 4 || xmlHttpGetMessages.readyState == 0)
      {
        // Call the server page to execute the server-side operation
        params = "mode=RetrieveNew" + "&outputDiv=" + outputDiv + "&yyyy=" + yyyy + "&mm=" + mm + "&dd=" + dd + "&times=" + timeframe + "&meno=" + meno  +"&priezvisko=" + priezvisko + "&email=" + email + "&tel=" + tel;
        xmlHttpGetMessages.open('POST', rURL, true);
        xmlHttpGetMessages.setRequestHeader("Content-Type", 
                                 "application/x-www-form-urlencoded");
        xmlHttpGetMessages.onreadystatechange = function () { handleHttpGetFeeds(outputDiv); };
        xmlHttpGetMessages.send(params);
		
      }
    }
    // display the error in case of failure
    catch (e)
    {
      displayError(e.toString());
    }
  }
}


// Retrieve titles from a feed and display them
function AjaxCancelReservation(outputDiv,timeframe,yyyy,mm,dd)
{
   var yyyy   = document.getElementById('yyyy').value;
   var mm     = document.getElementById('mm').value;
   var dd     = document.getElementById('dd').value;

  // only continue if xmlHttp isn't void
  if (xmlHttpGetMessages)
  {
	// try to connect to the server
    try
    {
      if (xmlHttpGetMessages.readyState == 4 || xmlHttpGetMessages.readyState == 0)
      {
        // Call the server page to execute the server-side operation
        params = "mode=cancel" + "&outputDiv=" + outputDiv + "&timeframe=" + timeframe + "&yyyy=" + yyyy + "&mm=" + mm + "&dd=" + dd;
        xmlHttpGetMessages.open('POST', rURL, true);
        xmlHttpGetMessages.setRequestHeader("Content-Type", 
                                 "application/x-www-form-urlencoded");
        xmlHttpGetMessages.onreadystatechange = function () { handleHttpGetFeeds(outputDiv); };
        xmlHttpGetMessages.send(params);
		
      }
    }
    // display the error in case of failure
    catch (e)
    {
      displayError(e.toString());
    }
  }
}


// Retrieve titles from a feed and display them
function AjaxReserveAll(outputDiv)
{
   var yyyy    = document.getElementById('yyyy').value;
   var mm      = document.getElementById('mm').value;
   var dd      = document.getElementById('dd').value;
   var message = document.getElementById('admin-message').value;

  // only continue if xmlHttp isn't void
  if (xmlHttpGetMessages)
  {
	// try to connect to the server
    try
    {
      if (xmlHttpGetMessages.readyState == 4 || xmlHttpGetMessages.readyState == 0)
      {
        // Call the server page to execute the server-side operation
        params = "mode=reserveAll" + "&message=" + message + "&yyyy=" + yyyy + "&mm=" + mm + "&dd=" + dd;
        xmlHttpGetMessages.open('POST', rURL, true);
        xmlHttpGetMessages.setRequestHeader("Content-Type", 
                                 "application/x-www-form-urlencoded");
        xmlHttpGetMessages.onreadystatechange = function () { handleHttpGetFeeds(outputDiv); };
        xmlHttpGetMessages.send(params);
		
      }
    }
    // display the error in case of failure
    catch (e)
    {
      displayError(e.toString());
    }
  }
}