/**
  * KAPAJAX module -
  * Kris' Awesome PHP Asynchrnonous Javascript and XML module.
  *
  * Not for distribution.
  * (C) 2005 Kris Sum
  */

// CLASS construct
function KAPAJAX()  {

 KAPAJAX.prototype.init = createRequestObject;
 KAPAJAX.prototype.sendComment = sendComment;
 KAPAJAX.prototype.getRoomInfo = getRoomInfo;
 KAPAJAX.prototype.getRoomSearchResults = getRoomSearchResults;
 KAPAJAX.prototype.getTopSearchResults = getTopSearchResults;

 /**
  * Creates an XML HTTP Request Object
  * Works for both IE and Mozilla etc.
  *
  */
	function createRequestObject() {

		if (window.XMLHttpRequest) {
			// Mozilla/other based browser
			this.xmlhttp = new XMLHttpRequest();
			if (this.xmlhttp.overrideMimeType) {
				// this.xmlhttp.overrideMimeType('text/xml');
				// - use only if returning valid XML
			}
		} else if (window.ActiveXObject) {
			// IE based browser
			 try {
			 	 this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
			 } catch (e) {
			 	 try {
			 	 	 this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			 	 } catch (e) { }
			 }
		}
	}


  /**
   * Sends a comment to the webmaster.
   *
   * @param string nav
   * @param string confirmCode
   * @param string fromName
   * @param string fromEmail
   * @param string messageText
   * @param string theStatus
   * @param string theCommentBox
   */
	function sendComment(nav,confirmCode,fromName,fromEmail,messageText,theStatus,theCommentBox) {
		var xmlhttp=this.xmlhttp;

		this.xmlhttp.open('get','http://www1.secam.ex.ac.uk/scripts/kapajax/sendComment.php?nav='+nav+'&confirmCode='+confirmCode+'&fromName='+fromName+'&fromEmail='+fromEmail+'&messageText='+messageText);
		this.xmlhttp.onreadystatechange =
		  function () {

			// setup variables
			obj_status = document.getElementById(theStatus);
			obj_cbox = document.getElementById(theCommentBox);

				// LOADING
				if (xmlhttp.readyState == 1) {
				  if (obj_status!=null) obj_status.innerHTML = '<span class="AJAX_busy">&nbsp;</span><span class="AJAX_loading"> Requesting Reply...</span>';
				}

				// DATA LOADED
				if (xmlhttp.readyState == 4) {
					if (xmlhttp.status != 200) {
						if (obj_status!=null) obj_status.innerHTML = '<div class="content_ext">An error occured whilst connecting to the comments system. Please try again later.</div>';
					} else {
						var response = xmlhttp.responseText;
						// check security
						if (response == 'unauthorised') {
							if (obj_status!=null) obj_status.innerHTML = '<div class="content_ext">An error occured whilst connecting to the comments system. Please ensure you have cookies enabled.</div>';
						} else {
						  if (response.charAt(0)=='1') {
  						  if (obj_cbox!=null) obj_cbox.innerHTML = '<div class="notice_ok">Comment Received, thank you for your feedback!</div>';
						  } else if (response.charAt(0)=='2') {
						    if (obj_status!=null) obj_status.innerHTML = '<div class="content_ext">'+response.substring(1)+'</div>';
						    document.getElementById('submit_button').style.display='';
						  }
						} // not unauthorised

					} // xmlhttp status 200
		   	} // DATA LOADED
		  }
		this.xmlhttp.send(null);
	} // sendComment


  /**
   * Retrieves room information based on roomIDd
   *
   * @param integer roomId
   */
	function getRoomInfo(roomId,theStatus,theTarget) {
		var xmlhttp=this.xmlhttp;
		this.xmlhttp.open('get','http://www1.secam.ex.ac.uk/scripts/kapajax/getroominfo.php?roomId='+roomId);
		this.xmlhttp.onreadystatechange =
		  function () {

			// setup variables
			obj = document.getElementById(theTarget);
			obj_status = document.getElementById(theStatus);

				// LOADING
				if (xmlhttp.readyState == 1) {
				  if (obj_status!=null) obj_status.innerHTML = '<span class="AJAX_busy">&nbsp;</span><span class="AJAX_loading"> Loading...</span>';
				}

				// DATA LOADED
				if (xmlhttp.readyState == 4) {
					if (xmlhttp.status != 200) {
						if (obj_status!=null) obj_status.innerHTML = 'ERROR';
					} else {
						var response = xmlhttp.responseText;
						// debug
						// document.getElementById('test').innerHTML = response;

						// check security
						if (response == 'unauthorised') {
							if (obj_status!=null) obj_status.innerHTML = 'Unauthorised access';
						} else {
						  if (obj_status!=null) obj_status.innerHTML = '&nbsp;';
						  if (obj!=null) obj.innerHTML = response;
						} // not unauthorised

					} // xmlhttp status 200
		   	} // DATA LOADED
		  }
		this.xmlhttp.send(null);
	} // getRoomInfo


  /**
   * Retrieves the result of a search for room info
   *
   * @param string search_text - text to search for
   * @param string search_area - area to search in
   * @param string theTarget - area to populate
   */
	function getRoomSearchResults(search_text,search_area,theTarget) {
		var xmlhttp=this.xmlhttp;
		this.xmlhttp.open('get','http://www1.secam.ex.ac.uk/scripts/kapajax/getroomsearchresults.php?searchtext='+search_text+'&searcharea='+search_area);
		this.xmlhttp.onreadystatechange =
		  function () {

			// setup variables
			obj = document.getElementById(theTarget);
			obj_status = document.getElementById(theTarget);

				// LOADING
				if (xmlhttp.readyState == 1) {
				  if (obj_status!=null) obj_status.innerHTML = '<span class="AJAX_busy">&nbsp;</span><span class="AJAX_loading"> Running Search...</span>';
				}

				// DATA LOADED
				if (xmlhttp.readyState == 4) {
					if (xmlhttp.status != 200) {
						if (obj_status!=null) obj_status.innerHTML = 'ERROR';
					} else {
						var response = xmlhttp.responseText;
						// debug
						// document.getElementById('test').innerHTML = response;

						// check security
						if (response == 'unauthorised') {
							if (obj_status!=null) obj_status.innerHTML = 'Unauthorised access';
						} else {
						  if (obj_status!=null) obj_status.innerHTML = '&nbsp;';

						   var index=response.indexOf('-');
						   var numresults = response.substring(0, index);
						   response = response.substring(index+1, response.length);
						   index=response.indexOf('-');
						   var firstresult = response.substring(0, index);
						   var searchresults = response.substring(index+1, response.length);

						  if (obj!=null) obj.innerHTML = searchresults;
						  if (numresults==1) {

						  }
						} // not unauthorised

					} // xmlhttp status 200
		   	} // DATA LOADED
		  }
		this.xmlhttp.send(null);
	} // getRoomSearchReults


/**
   * Retrieves the result of a search from the top toolbar
   *
   */
	function getTopSearchResults(search_text,search_area,theTarget,theStatus,theSearchResult) {
		var xmlhttp=this.xmlhttp;
		//this.xmlhttp.abort;   - BERAKS IN IE
		this.xmlhttp.open('get','http://www1.secam.ex.ac.uk/scripts/kapajax/gettopsearchresults.php?searchtext='+search_text+'&searcharea='+search_area);
		this.xmlhttp.onreadystatechange =
		  function () {

			// setup variables
			obj = document.getElementById(theTarget);
			obj_status = document.getElementById(theStatus);
			obj_searchResult = document.getElementById(theSearchResult);

				// LOADING
				if (xmlhttp.readyState == 1) {
				  if (obj_status!=null) obj_status.innerHTML = '<span class="AJAX_busy">&nbsp;</span><span class="AJAX_loading"> Running Search...</span>';
				}

				// DATA LOADED
				if (xmlhttp.readyState == 4) {
					if (xmlhttp.status != 200) {
						if (obj_status!=null) obj_status.innerHTML = 'ERROR';
					} else {
						var response = xmlhttp.responseText;
						// debug
						// document.getElementById('test').innerHTML = response;

						// check security
						if (response == 'unauthorised') {
							if (obj_status!=null) obj_status.innerHTML = 'Unauthorised access';
						} else {
						  if (obj_status!=null) obj_status.innerHTML = '&nbsp;';

						   var index=response.indexOf('-');
						   var numresults = response.substring(0, index);
						   response = response.substring(index+1, response.length);
						   index=response.indexOf('-');
						   var firstresult = response.substring(0, index);
						   var searchresults = response.substring(index+1, response.length);

						  if (obj!=null) {
						    if (numresults==0) {
						      obj_status.innerHTML='No Results Found';
						      obj.style.display='none';
						    } else {
						     obj_searchResult.innerHTML = searchresults;
                 var windowWidth=getWindowSize('width')-530;
						     obj.style.left=windowWidth+'px';
						     obj.style.opacity=0;
						     obj.style.display='';
                  var attributes = { width: {to: 500}, height: {to: 200},opacity: { to: 0.93}  };
                  var anim  = new YAHOO.util.Anim(obj, attributes, 1, YAHOO.util.Easing.easeOut);
                  anim.animate();
						    }
						  }

						  if (numresults==1) {

						  }
						} // not unauthorised

					} // xmlhttp status 200
		   	} // DATA LOADED
		  }
		this.xmlhttp.send(null);
	} // getTopSearchReults



} // end of class