var map;
var gdir;
var points=[];
var markers=[];
var reasons=[];
reasons[G_GEO_SUCCESS]            = "Success";
reasons[G_GEO_MISSING_ADDRESS]    = "Missing Address: The address was either missing or had no value.";
reasons[G_GEO_UNKNOWN_ADDRESS]    = "Unknown Address:  No corresponding geographic location could be found for the specified address.";
reasons[G_GEO_UNAVAILABLE_ADDRESS]= "Unavailable Address:  The geocode for the given address cannot be returned due to legal or contractual reasons.";
reasons[G_GEO_BAD_KEY]            = "Bad Key: The API key is either invalid or does not match the domain for which it was given";
reasons[G_GEO_TOO_MANY_QUERIES]   = "Too Many Queries: The daily geocoding quota for this site has been exceeded.";
reasons[G_GEO_SERVER_ERROR]       = "Server error: The geocoding request could not be successfully processed.";
reasons[G_GEO_BAD_REQUEST]        = "A directions request could not be successfully parsed.";
reasons[G_GEO_MISSING_QUERY]      = "No query was specified in the input.";
reasons[G_GEO_UNKNOWN_DIRECTIONS] = "Could not compute directions between the points.";

function createMap(mapCanvasElmtId)
{
	if (GBrowserIsCompatible())
	{ 
		map = new GMap2(document.getElementById(mapCanvasElmtId));
		map.addControl(new GLargeMapControl());
		map.addControl(new GMapTypeControl());
	}
	else {
		alert("Sorry, the Google Maps API is not compatible with this browser");
	}
}

function createMapDirections(mapDirectionsElmtId)
{
	gdir = new GDirections(map, document.getElementById(mapDirectionsElmtId));
	
	GEvent.addListener(gdir, "error", function() {
		var code = gdir.getStatus().code;
		var reason="Code "+code;
		if (reasons[code]) {
			reason = reasons[code];
		} 
		alert("Failed to obtain directions, "+reason);
	});
}

function setMapCenter(lat, lng, zoomLevel)
{
	map.setCenter(new GLatLng(lat,lng),zoomLevel);
}

function addMapOverlay(lat, lng, html)
{
	map.addOverlay(createMapMarker(lat, lng, html));
}

function createMapMarker(lat, lng, html)
{
	var point = new GLatLng(lat,lng);
	var marker = new GMarker(point);
	GEvent.addListener(marker, "click", function() { marker.openInfoWindowHtml(html); });
	points[points.length]=point;
	markers[markers.length]=marker;
	return marker;
}

function getMapDirections(AddrStartElmtId, AddrDestElmtId) {
	var saddr = document.getElementById("saddr").value;
	var daddr = document.getElementById("daddr").value;
	if (saddr.length > 0 && daddr.length > 0)
	{
		gdir.load("from: " + saddr + " to: " + daddr);
	}
}



/*
============================================
Zoom the google map into the specified state
============================================
*/
function zoomState(state_code){
	var sw; // southwest coordinates of zoom area
	var ne; // northeast coordinates of zoom area
	switch(state_code){
		case 'AL': sw=new GLatLng(29.11377539511439, -92.7685546875); ne = new GLatLng(35.96022296929667, -80.4638671875); break;
		case 'AK': sw=new GLatLng(58.17070248348609, -175.166015625); ne = new GLatLng(71.63599288330606, -125.94726562500001); break;
		case 'AZ': sw=new GLatLng(30.977609093348686, -117.421875); ne = new GLatLng(37.68382032669382, -105.1171875); break;
		case 'AR': sw=new GLatLng(31.409912194070973, -97.998046875); ne = new GLatLng(38.08268954483802, -85.693359375); break;
		case 'CA': sw=new GLatLng(34.14512718337613, -127.13378906250001); ne = new GLatLng(43.13306116240612, -102.5244140625); break;
		case 'CO': sw=new GLatLng(35.55010533588551, -111.6650390625); ne = new GLatLng(41.88592102814744, -99.3603515625); break;
		case 'CT': sw=new GLatLng(40.75557964275588, -74.24560546875); ne = new GLatLng(42.27730877423709, -71.16943359375); break;
		case 'DE': sw=new GLatLng(37.361425501905146, -78.321533203125); ne = new GLatLng(40.52215098562377, -72.169189453125); break;
		case 'DC': sw=new GLatLng(37.142803443716836, -80.101318359375); ne = new GLatLng(40.3130432088809, -73.948974609375); break;
		case 'FL': sw=new GLatLng(24.86650252692691, -89.4287109375); ne = new GLatLng(32.008075959291055, -77.1240234375); break;
		case 'GA': sw=new GLatLng(29.286398892934763, -89.296875); ne = new GLatLng(36.12012758978146, -76.9921875); break;
		case 'HI': sw=new GLatLng(18.656654486539995, -160.499267578125); ne = new GLatLng(22.46180203533398, -154.346923828125); break;
		case 'ID': sw=new GLatLng(39.061849134291535, -127.17773437499999); ne = new GLatLng(50.54136296522161, -102.568359375); break;
		case 'IL': sw=new GLatLng(36.79169061907076, -95.009765625); ne = new GLatLng(43.02071359427862, -82.705078125); break;
		case 'IN': sw=new GLatLng(36.84446074079564, -92.26318359375); ne = new GLatLng(43.068887774169625, -79.95849609375); break;
		case 'IA': sw=new GLatLng(38.99357205820944, -99.99755859375); ne = new GLatLng(45.02695045318543, -87.69287109375); break;
		case 'KS': sw=new GLatLng(35.28150065789119, -104.39208984375); ne = new GLatLng(41.64007838467891, -92.08740234375); break;
		case 'KY': sw=new GLatLng(34.488447837809304, -91.4501953125); ne = new GLatLng(40.91351257612757, -79.1455078125); break;
		case 'LA': sw=new GLatLng(27.955591004642528, -98.67919921875); ne = new GLatLng(34.88593094075315, -86.37451171875); break;
		case 'ME': sw=new GLatLng(42.212245162885814, -75.12451171875); ne = new GLatLng(47.945786463687185, -62.81982421875); break;
		case 'MD': sw=new GLatLng(37.509725842937485, -80.057373046875); ne = new GLatLng(40.66397287638688, -73.905029296875); break;
		case 'MA': sw=new GLatLng(40.6723059714534, -75.047607421875); ne = new GLatLng(43.683763524273346, -68.895263671875); break;
		case 'MI': sw=new GLatLng(40.38002840251183, -90.17578125); ne = new GLatLng(46.28622391806705, -77.87109375); break;
		case 'MN': sw=new GLatLng(40.58058466412761, -105.5126953125); ne = new GLatLng(51.781435604431195, -80.9033203125); break;
		case 'MS': sw=new GLatLng(29.24806324379655, -95.361328125); ne = new GLatLng(36.08462129606931, -83.056640625); break;
		case 'MO': sw=new GLatLng(35.40696093270201, -98.7451171875); ne = new GLatLng(41.75492216766298, -86.4404296875); break;
		case 'MT': sw=new GLatLng(40.58058466412761, -122.12402343749999); ne = new GLatLng(51.781435604431195, -97.5146484375); break;
		case 'NE': sw=new GLatLng(38.70265930723801, -106.23779296875); ne = new GLatLng(44.762336674810996, -93.93310546875); break;
		case 'NV': sw=new GLatLng(35.79999392988527, -122.80517578125); ne = new GLatLng(42.114523952464246, -110.50048828125); break;
		case 'NH': sw=new GLatLng(42.512601715736665, -74.77294921875); ne = new GLatLng(45.43700828867389, -68.62060546875); break;
		case 'NJ': sw=new GLatLng(37.86618078529668, -77.926025390625); ne = new GLatLng(41.004775422229464, -71.773681640625); break;
		case 'NM': sw=new GLatLng(30.902224705171417, -111.708984375); ne = new GLatLng(37.614231415424165, -99.404296875); break;
		case 'NY': sw=new GLatLng(40.212440718286466, -80.88134765625); ne = new GLatLng(46.13417004624326, -68.57666015625); break;
		case 'NC': sw=new GLatLng(31.9148675032762, -87.1435546875); ne = new GLatLng(38.54816542304656, -74.8388671875); break;
		case 'ND': sw=new GLatLng(44.49650533109345, -106.80908203125); ne = new GLatLng(50.00773901463685, -94.50439453125); break;
		case 'OH': sw=new GLatLng(37.35269280367273, -87.978515625); ne = new GLatLng(43.5326204268101, -75.673828125); break;
		case 'OK': sw=new GLatLng(31.877557643340015, -104.12841796875); ne = new GLatLng(38.51378825951165, -91.82373046875); break;
		case 'OR': sw=new GLatLng(41.21172151054787, -126.123046875); ne = new GLatLng(47.040182144806664, -113.818359375); break;
		case 'PA': sw=new GLatLng(37.63163475580643, -83.43017578125); ne = new GLatLng(43.78695837311561, -71.12548828125); break;
		case 'RI': sw=new GLatLng(41.3500103516271, -72.2186279296875); ne = new GLatLng(42.108411365705855, -70.6805419921875); break;
		case 'SC': sw=new GLatLng(32.01739159980399, -83.814697265625); ne = new GLatLng(35.398005947151056, -77.662353515625); break;
		case 'SD': sw=new GLatLng(41.73852846935917, -106.36962890625); ne = new GLatLng(47.517200697839414, -94.06494140625); break;
		case 'TN': sw=new GLatLng(32.287132632616355, -92.900390625); ne = new GLatLng(38.89103282648846, -80.595703125); break;
		case 'TX': sw=new GLatLng(24.5271348225978, -112.060546875); ne = new GLatLng(38.341656192795924, -87.451171875); break;
		case 'UT': sw=new GLatLng(36.29741818650808, -117.44384765625); ne = new GLatLng(42.56926437219384, -105.13916015625); break;
		case 'VT': sw=new GLatLng(42.36666166373274, -75.706787109375); ne = new GLatLng(45.29807513870794, -69.554443359375); break;
		case 'VA': sw=new GLatLng(34.397844946449844, -85.4736328125); ne = new GLatLng(40.83043687764923, -73.1689453125); break;
		case 'WA': sw=new GLatLng(44.99588261816546, -126.58447265624999); ne = new GLatLng(50.45750402042055, -114.27978515625); break;
		case 'WV': sw=new GLatLng(35.79999392988527, -86.41845703125); ne = new GLatLng(42.114523952464246, -74.11376953125); break;
		case 'WI': sw=new GLatLng(41.62365539068639, -95.80078125); ne = new GLatLng(47.41322033016902, -83.49609375); break;
		case 'WY': sw=new GLatLng(39.99395569397331, -113.8623046875); ne = new GLatLng(45.93587062119052, -101.5576171875); break;
		default: sw=new GLatLng(10.141931686131018, -145.1953125); ne = new GLatLng(59.88893689676585, -46.7578125); break;
    }
	var bound = new GLatLngBounds(sw,ne);
	map.setCenter(bound.getCenter(),map.getBoundsZoomLevel(bound));
}