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// global variables for the map
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var map;
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var control;
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function initMap(GEOSERVER_URL, SERVLET_URL, qformat, bounds, additionalLayers) {
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	if (!bounds) {
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		bounds = new OpenLayers.Bounds(-180,-90,180,90);
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	}
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    map = new OpenLayers.Map('map', { 'maxExtent':bounds, 'maxResolution':'auto'});
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    var metacat_points = new OpenLayers.Layer.WMS( "Metacat Doc Points",
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        GEOSERVER_URL + "/wms",
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        {layers: "data_points",
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         transparent: "true", format: "image/gif"} );
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    var metacat_bounds = new OpenLayers.Layer.WMS( "Metacat Doc Bounds",
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    	GEOSERVER_URL + "/wms",
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        {layers: "data_bounds",
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         transparent: "true", format: "image/gif"} );
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    var world_borders = new OpenLayers.Layer.WMS( "World Borders",
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    	GEOSERVER_URL + "/wms",
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        {layers: "world_borders",
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         format: "image/jpeg"} );
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    var ol_wms = new OpenLayers.Layer.WMS( "OpenLayers WMS", 
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        "http://labs.metacarta.com/wms/vmap0",
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        {layers: 'basic'} );
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    // NOTE: as of Jan 2012, it seems that this WMS service requires basic authentication
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    //var demis = new OpenLayers.Layer.WMS( "Demis World Map",
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    //    "http://www2.demis.nl/WMS/wms.asp?wms=WorldMap",
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    //    {layers: 'Bathymetry,Countries,Topography,Hillshading,Coastlines,Waterbodies,Inundated,Rivers,Streams,Builtup+areas,Railroads,Highways,Roads,Trails,Borders,Cities,Settlements,Airports'} );
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	//map.addLayers([demis, ol_wms, world_borders, metacat_points, metacat_bounds]);	
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	map.addLayers([world_borders, metacat_points, metacat_bounds]);	
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	// perhaps a skin has added more layers
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	if (additionalLayers) {
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		map.addLayers(additionalLayers);
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	}
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    // off by default
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	metacat_bounds.setVisibility(false);
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    // get the drag box event
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	//control = new OpenLayers.Control();
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	control = new OpenLayers.Control({title: "Metacat spatial query", displayClass: "spatialQuery"});
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	OpenLayers.Util.extend(
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			control, {
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			    draw: function () {
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			        // this Handler.Box will intercept the shift-mousedown
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			        // before Control.MouseDefault gets to see it
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			        this.box = new OpenLayers.Handler.Box( control,
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			        		{"done": this.notice}
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                            //,{keyMask: OpenLayers.Handler.MOD_SHIFT}
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			        		);
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			        this.box.activate();
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			    },
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			    notice: function (bounds) {
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			    	var min_px;
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			        var max_px;
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			        // check that it is a rectangle
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			        if (bounds.left) { 
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				        min_px = new OpenLayers.Pixel( bounds.left, bounds.bottom);
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				        max_px = new OpenLayers.Pixel( bounds.right, bounds.top);
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					} else {
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						var tolerance = new OpenLayers.Pixel(3, 3);
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					    min_px = new OpenLayers.Pixel( bounds.x - tolerance.x, bounds.y + tolerance.y);
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					    max_px = new OpenLayers.Pixel( bounds.x + tolerance.x, bounds.y - tolerance.y);
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					}
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			        var min_ll = map.getLonLatFromPixel(min_px);
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			        var max_ll = map.getLonLatFromPixel(max_px);
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			      	//alert("longitude: " + round(mid_ll.lon,3) + " , latitude: " + round(mid_ll.lat,3) );
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				    url = SERVLET_URL + '?action=spatial_query&xmin='+min_ll.lon+'&ymin='+min_ll.lat+'&xmax='+max_ll.lon+'&ymax='+max_ll.lat+'&skin=' + qformat;
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				    OpenLayers.ProxyHost = '';
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				    newwindow = 
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					    window.open(
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							    url,
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							    'queryWin',
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				                'height=600,width=800,status=yes,toolbar=yes,menubar=no,location=yes,resizable=yes,scrollbars=yes');
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			    }
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	});
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	var tb = OpenLayers.Class(OpenLayers.Control.NavToolbar, {
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		initialize: function() {
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			var options = null;
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			OpenLayers.Control.Panel.prototype.initialize.apply(this, [options]);
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			this.addControls([
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			                  new OpenLayers.Control.Navigation({'zoomWheelEnabled': false}),
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			                  new OpenLayers.Control.ZoomBox(),
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			                  control
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			                  ]);
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		}
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	});
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	map.addControl(new tb());
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	//map.addControl(control);
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	// some built-in controls
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	//map.addControl(new OpenLayers.Control.NavToolbar());
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	map.addControl(new OpenLayers.Control.LayerSwitcher());
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	map.addControl(new OpenLayers.Control.MousePosition());
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	// zoom to center
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    if (!map.getCenter()) {
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         map.zoomToMaxExtent();
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    }
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}
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// for named location navigation
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function zoomToLocation(locations) {
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	var selectedLocation = locations.options[locations.selectedIndex].value;
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	// add a comma for the rectangle
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	selectedLocation = selectedLocation.replace(" ", ",")
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	var bounds = OpenLayers.Bounds.fromString(selectedLocation);
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    map.zoomToExtent(bounds);
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}
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