var map;
var localSearch = new GlocalSearch();

var icon = new GIcon();
icon.image = "http://www.google.com/mapfiles/marker.png";
icon.shadow = "http://www.google.com/mapfiles/shadow50.png";
icon.iconSize = new GSize(20, 34);
icon.shadowSize = new GSize(37, 34);
icon.iconAnchor = new GPoint(10, 34);

function createRequest() {
  
  // create an Ajax Request
  
  var ajaxRequest;
  
  try
  {
    ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
  }    
    catch (e1)
    {
      try
      {
        ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
      }
        catch (e2)
        {
          ajaxRequest = new XMLHttpRequest();
        }
    }
  
  return ajaxRequest;
}

function usePointFromPostcode(postcode, callbackFunction) {
	
	localSearch.setSearchCompleteCallback(null, 
		function() {
			
			if (localSearch.results[0])
			{		
				var resultLat = localSearch.results[0].lat;
				var resultLng = localSearch.results[0].lng;
				var point = new GLatLng(resultLat,resultLng);
				
				var ajax_connection = createRequest();
  ajax_connection.open('get', "add_gps.php?postcode=" + postcode + "&latitude=" + resultLat + "&longitude=" + resultLng);
  ajax_connection.send(null);


				
				callbackFunction(point);
			}else{
				alert("Postcode not found!");
			}
		});	
		
	localSearch.execute(postcode + ", UK");
	
}

function placeMarkerAtPoint(point)
{
	var marker = new GMarker(point,icon);
	map.addOverlay(marker);
}

function setCenterToPoint(point)
{
	map.setCenter(point, 17);
}

function showPointLatLng(point)
{
	alert("Latitude: " + point.lat() + "\nLongitude: " + point.lng() + "Post Code" + postcode);
}

function mapLoad() {
	if (GBrowserIsCompatible()) {
		map = new GMap2(document.getElementById("map"));
		
		
		map.addControl(new GLargeMapControl());
		map.addControl(new GMapTypeControl());
		map.setCenter(new GLatLng(54.952386,-4.306641), 6);
		
		
		var i = 0;
		      // Read the data from XML
      var request = GXmlHttp.create();
      // Open the XML file
      request.open("GET", "marks.xml", true);
      request.onreadystatechange = function() {
         if (request.readyState == 4) {
            var xmlDoc = request.responseXML;
            // Obtain the array of markers and loop through it
            var markers = xmlDoc.documentElement.getElementsByTagName("marker");

            for (var i = 0; i < markers.length; i++) {
               // Obtain the attribues of each marker
               var lat = parseFloat(markers[i].getAttribute("lat"));
               var lng = parseFloat(markers[i].getAttribute("lng"));
               var point = new GLatLng(lat,lng);
               var name = markers[i].getAttribute("name");
               var contact = markers[i].getAttribute("contact");
               var url = markers[i].getAttribute("url");
			   
               // Call the function to create the marker
               var marker = createMarker(point,name,contact,url);
               map.addOverlay(marker);
            }
         }
      }
      request.send(null);

      // Function to create the marker and set up the event window
      function createMarker(point,name,contact,url) {
         // Create the HTML text based on the values passed in from XML
         var markerhtml = "";
         if (name != "") markerhtml += "<b>" + name + "</b><br />";
         //markerhtml += address + "<br>" + city + ", " + state + " " + zip + "<br>";
         if (contact != "") markerhtml += contact + "<br />";
         if (url != "") markerhtml += "<br /><a href=\"" + url + "\">more...</a>";

         // Create the map marker
         var marker = new GMarker(point,{title:name});
         // Add a click event to each marker which will open the HTML window
         GEvent.addListener(marker, "click", function() {
            marker.openInfoWindowHtml(markerhtml);
         });
         i++;
         return marker;
      }
	  
	  
	}
}

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

function addUnLoadEvent(func) {
	var oldonunload = window.onunload;
	if (typeof window.onunload != 'function') {
	  window.onunload = func;
	} else {
	  window.onunload = function() {
	    oldonunload();
	    func();
	  }
	}
}



function usePointFromPostcodeViaCache(postcode, callbackFunction) {
  
  map.clearOverlays();
  var ajax_connection = createRequest();
  
  ajax_connection.open('get', "geocode.php?postcode=" + postcode);
  
  // setup the function to deal with the reply
  ajax_connection.onreadystatechange = function(){
    
    if (ajax_connection.readyState == 4) {
      var xmlDoc = ajax_connection.responseXML;
      var markers = xmlDoc.documentElement.getElementsByTagName("location");
      
      if (markers.length > 0)
      {
        var resultLat = markers[0].getAttribute('latitude');
        var resultLng = markers[0].getAttribute('longitude');
        var resultDate = markers[0].getAttribute('date_added');
        var point = new GLatLng(resultLat,resultLng);
        document.getElementById("result").innerHTML = "Result for " + postcode + " came from cache. It was last cached on " + resultDate;
        callbackFunction(point);
      }else{
        usePointFromPostcode(postcode, callbackFunction);
      }
    }
  }  
  
  ajax_connection.send(null);
}




addLoadEvent(mapLoad);
addUnLoadEvent(GUnload);