/**************************************************
 * Custom map layers:
 * Adapted from Jef Poskanzer's Acme Mapper
 * (http://mapper.acme.com/)
 **************************************************/
var USGS_TOPO_TILES = WMSCreateMap('Topo','Topo maps by USGS via terraserver-usa.com','Topo maps unavailable',5,17,400,'http://terraservice.net/ogcmap6.ashx?version=1.1.1&request=GetMap&styles=&srs=EPSG:4326&format=image/jpeg&bgcolor=0xCCCCCC&exceptions=INIMAGE&layers=DRG');
var USGS_AERIAL_TILES = WMSCreateMap('Aerial','Imagery by USGS via terraserver-usa.com','USGS aerial imagery unavailable',7,18,400,'http://terraservice.net/ogcmap6.ashx?version=1.1.1&request=GetMap&styles=&srs=EPSG:4326&format=image/jpeg&bgcolor=0xCCCCCC&exceptions=INIMAGE&layers=DOQ');
var NRCAN_TOPO_TILES = WMSCreateMap('NRCan','Maps by NRCan.gc.ca','NRCan maps unavailable',6,18,600,'http://wms.cits.rncan.gc.ca/cgi-bin/cubeserv.cgi?version=1.1.3&request=GetMap&format=image/png&bgcolor=0xFFFFFF&exceptions=application/vnd.ogc.se_inimage&srs=EPSG:4326&layers=PUB_50K:CARTES_MATRICIELLES/RASTER_MAPS');
var BLUEMARBLE_TILES = WMSCreateMap('BlueMarble','Map by NASA','OnEarth server unavailable',3,8,128,'http://onearth.jpl.nasa.gov/wms.cgi?request=GetMap&styles=&srs=EPSG:4326&format=image/jpeg&layers=modis');	
var DAILY_TERRA_TILES = WMSCreateMap('"Terra"','Map by NASA','OnEarth server unavailable',3,10,256,'http://onearth.jpl.nasa.gov/wms.cgi?request=GetMap&styles=&srs=EPSG:4326&format=image/jpeg&layers=daily_terra');	
var DAILY_AQUA_TILES = WMSCreateMap('"Aqua"','Map by NASA','OnEarth server unavailable',3,10,256,'http://onearth.jpl.nasa.gov/wms.cgi?request=GetMap&styles=&srs=EPSG:4326&format=image/jpeg&layers=daily_aqua'); 

function GV_Add_Custom_Layers(map) {
	map.addMapType(USGS_TOPO_TILES);
	map.addMapType(USGS_AERIAL_TILES);
	map.addMapType(NRCAN_TOPO_TILES);
	map.addMapType(BLUEMARBLE_TILES);
	map.addMapType(DAILY_TERRA_TILES);
	map.addMapType(DAILY_AQUA_TILES);}

function WMSCreateMap(name,copyright,errorMessage,minResolution,maxResolution,tileSize,baseUrl) {
	var tileLayer = new GTileLayer(new GCopyrightCollection(copyright),minResolution,maxResolution);
	tileLayer.baseUrl = baseUrl;
	tileLayer.tileSize = tileSize;
	tileLayer.getTileUrl = WMSGetTileUrl;
	tileLayer.getCopyright = function() { return { prefix:'',copyrightTexts:[copyright]}; };
	var tileLayers = [tileLayer];
	return new GMapType(tileLayers,G_SATELLITE_MAP.getProjection(),name,{errorMessage:errorMessage,tileSize:tileSize});
}
function WMSGetTileUrl(tile,zoom) {
	var southWestPixel = new GPoint(tile.x*this.tileSize,(tile.y+1)*this.tileSize);
	var northEastPixel = new GPoint((tile.x+1)*this.tileSize,tile.y*this.tileSize);
	var southWestCoords = G_SATELLITE_MAP.getProjection().fromPixelToLatLng(southWestPixel,zoom);
	var northEastCoords = G_SATELLITE_MAP.getProjection().fromPixelToLatLng(northEastPixel,zoom);
	var bbox = southWestCoords.lng()+','+southWestCoords.lat()+','+northEastCoords.lng()+','+northEastCoords.lat();
	return this.baseUrl+'&bbox='+bbox+'&width='+this.tileSize+'&height='+this.tileSize;
}


/**************************************************
 * Custom map-type control:
 * more or less from Google's own documentation
 **************************************************/
function GV_MapTypeControl() {}
	GV_MapTypeControl.prototype = new GControl();
	GV_MapTypeControl.prototype.initialize = function(map) {
		GV_Add_Custom_Layers(map);
		var map_types = [
			{ label:'Google map',type:'G_NORMAL_MAP',title:'Google street map',bounds:[-180,-90,180,90],excluded:[] }
			,{ label:'Google satellite',type:'G_SATELLITE_MAP',title:'Google satellite map',bounds:[-180,-90,180,90],excluded:[] }
			,{ label:'Google hybrid',type:'G_HYBRID_MAP',title:'Google "hybrid" map',bounds:[-180,-90,180,90],excluded:[] }
			,{ label:'USGS topo',type:'USGS_TOPO_TILES',title:'USGS topographic map',bounds:[-169,18,-66,72],excluded:[] }
			,{ label:'USGS aerial',type:'USGS_AERIAL_TILES',title:'USGS aerial photos (black/white)',bounds:[-152,17,-65,65],excluded:[] }
			,{ label:'Canada topo',type:'NRCAN_TOPO_TILES',title:'NRCan/Toporama maps with contour lines',bounds:[-141,41.7,-52,85],excluded:[-141,41.7,-86,48] }
			,{ label:'Blue Marble',type:'BLUEMARBLE_TILES',title:'NASA "Visible Earth" image',bounds:[-180,-90,180,90],excluded:[] }
			,{ label:'Daily "Terra"',type:'DAILY_TERRA_TILES',title:'Daily imagery from "Terra" satellite',bounds:[-180,-90,180,90],excluded:[] }
			,{ label:'Daily "Aqua"',type:'DAILY_AQUA_TILES',title:'Daily imagery from "Aqua" satellite',bounds:[-180,-90,180,90],excluded:[] }
];
		var center_lat = map.getCenter().lat();
		var center_lng = map.getCenter().lng();
		
		var map_selector = document.createElement("select");
		map_selector.id = 'map_selector';
		map_selector.style.font = 'bold 12px Verdana';
		map_selector.style.backgroundColor = '#FFFFFF';
		for (j=0; j<map_types.length; j++) {
			if (( (center_lng >= map_types[j]['bounds'][0] && center_lat >= map_types[j]['bounds'][1] && center_lng <= map_types[j]['bounds'][2] && center_lat <= map_types[j]['bounds'][3]) && !(center_lng >= map_types[j]['excluded'][0] && center_lat >= map_types[j]['excluded'][1] && center_lng <= map_types[j]['excluded'][2] && center_lat <= map_types[j]['excluded'][3]) ) ) {
				var opt = document.createElement("option");
				opt.value = map_types[j]['type'];
				opt.appendChild(document.createTextNode(map_types[j]['label']));
				map_selector.appendChild(opt);
				if (map.getCurrentMapType() == eval(opt.value)) { map_selector.selectedIndex = map_selector.length - 1; }
			}
		}
		GEvent.addDomListener(map_selector, "change", function(){map.setMapType(eval(this.value));} );
		map.getContainer().appendChild(map_selector);
		return map_selector;
	}
	GV_MapTypeControl.prototype.getDefaultPosition = function() {
		return new GControlPosition(G_ANCHOR_TOP_RIGHT, new GSize(7,7));
}