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 usePointFromPostcodeViaCache(postcode, callbackFunction) {
	
	map.clearOverlays();
	var ajax_connection = createRequest();
	
	var d = new Date();
	var time = d.getTime();
	
	ajax_connection.open('get', "/js/gmap/geocode.asp?postcode=" + postcode + "&time=" + time);
	
	// 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);
}

function usePointFromPostcode(postcode, callbackFunction) {
	
		localSearch.setSearchCompleteCallback(null, 
			function() {
			
				if (localSearch.results[0])
				{
					var d = new Date();
					var time = d.getTime();
					var resultLat = localSearch.results[0].lat;
					var resultLng = localSearch.results[0].lng;
					var point = new GLatLng(resultLat,resultLng);
					//document.getElementById("result").innerHTML = "Result for " + postcode + " came from Google.";
					var ajax_connection = createRequest();
					ajax_connection.open('get', "/js/gmap/cache.asp?postcode=" + postcode + "&latitude=" + resultLat + "&longitude=" + resultLng + "&time=" + time);
					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);
	map.setCenter(point, 15);
}

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

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

function mapLoad() {
	if (GBrowserIsCompatible()) {
		map = new GMap2(document.getElementById("map"));
		
		map.addControl(new GSmallMapControl());
		map.setCenter(new GLatLng(54.622978,-2.592773), 5, G_HYBRID_MAP);
	}
}

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();
	  }
	}
}

addLoadEvent(mapLoad);
addUnLoadEvent(GUnload);