var startZoom = 9;
var map;
var markerCluster;
var skoolswitch;
var lastsearch="";

var bounds = null;
bounds = new google.maps.LatLngBounds();
var clusterer;
var currentmarkers=[];
var currentmarkerscount=0;
var maxbuffersize=20;
var busy=false;

function setFocusSchool(id,lat,lng,z) {
	var curzoom=map.getZoom();
	if (z==-1) {
		z=curzoom;
	}
	if (z==100) {
		z=curzoom+2;
		if (z>12) {z=curzoom;}
	}
	if (lat>-180) {
		map.setCenter(  new google.maps.LatLng(lat,lng),z);
	}
	//var iframeelem=document.getElementById('detailframe');
	//iframeelem.src="/search/js2/schoolsdetail.php?id="+id;
	//window.open("/search/js2/schoolsdetail.php?id="+id);
}
		

function addMarker(latitude, longitude, description) {
    var marker = new GMarker(new google.maps.LatLng(latitude, longitude));
    marker.getIcon().infoShadowAnchor  = new GPoint(0,0);
    GEvent.addListener(marker, 'mouseover',
        function() {
            marker.openInfoWindowHtml(description);
        }
    );
		return marker;
}

function changed() {
	alert('changed!');
}

function init() {
    if (GBrowserIsCompatible()) {	
    
	    var myOptions = {
		    zoom: startZoom,
		    center: new google.maps.LatLng(centerLatitude, centerLongitude),
		    navigationControl: true,
		    scaleControl: true
		  }
			
        map = new google.maps.Map(document.getElementById("map"),myOptions);
        map.setZoom(startZoom);
        //map.addControl(new GSmallMapControl());
    map.addControl(new GLargeMapControl());
    map.addControl(new GMapTypeControl());
				map.enableContinuousZoom();
				

				//map.fitBounds(bnds);

		GEvent.addListener(map,'moveend',
			function() {
					if (!busy) {
						var z=(0+map.getZoom());
						if (z>6) {
							var bnds=map.getBounds();
							var sw=bnds.getSouthWest();
							var ne=bnds.getNorthEast();
							//setStatus("Looking for schools between "+sw.lat()+"," +sw.lng() + " and "+ne.lat()+", "+ne.lng());
		  				
							getMarkers(sw.lat(),ne.lat(),sw.lng(),ne.lng());
							busy=true;
						}
		  			else {
		  				setStatus("<b>You are zoomed out too much to display school icons.</b>");
		  				busy=false;
		  			}
					} //end if not busy
				}//end function
			); //end addlistener
			getMarkers(map.getBounds().getSouthWest().lat(),map.getBounds().getNorthEast().lat(),
			map.getBounds().getSouthWest().lng(),map.getBounds().getNorthEast().lng());
			currentmarkers.push(addMarker(0,0,'No schools found'));
			var mstyleopts= new Object();
			mstyleopts.gridSize=30;
			//mstyleopts.maxZoom=10;
			markerCluster = new MarkerClusterer(map, currentmarkers,mstyleopts);
			markerCluster.clearMarkers();
    }
    
		if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)){ //test for Internet Explorer
	 		var iev=new Number(RegExp.$1)
	 	}
		if (iev<=7) {
			
			var mapel=document.getElementById('map');
			mapel.style.height=0;
			var nomap=document.getElementById('nomap');
			nomap.innerHTML="<p style=\"padding: 50px;\">If you are seeing this message then we are afraid that your web browser is not compatible with this site. We recommend you upgrade to <a href=\"http://www.mozilla.com/en-US/firefox/ie.html\">one</a> of the <a href=\"http://www.microsoft.com/windows/internet-explorer/default.aspx\">modern</a> <a href=\"http://www.google.com/chrome\">browers</a>.</p>";
			alert("Please upgrade your browser!");
		}
}

function setUpClusterer() {
}

//Gets the browser specific XmlHttpRequest Object
function getXmlHttpRequestObject() {
	if (window.XMLHttpRequest) {
		return new XMLHttpRequest();
	} else if(window.ActiveXObject) {
			return new ActiveXObject("Microsoft.XMLHTTP");
	} else {
		document.getElementById('p_status').innerHTML = 		'Status: Cound not create XmlHttpRequest Object.' +		'Consider upgrading your browser.';
	}
}
var getPointsReq = getXmlHttpRequestObject();
var lastdate="";

function resetMap() {
	window.location="index.php?centerlat="+map.getCenter().lat()+"&centerlong="+map.getCenter().lng()+"&startzoom="+map.getZoom();
//	searchtermtext="";
//	getMarkers(map.getBounds().getSouthWest().lat(),map.getBounds().getNorthEast().lat(),map.getBounds().getSouthWest().lng(),map.getBounds().getNorthEast().lng(),true);
}
function getMarkers(swlat,nelat,swlng,nelng,ignoresearch) {
	if (getPointsReq.readyState == 4 || getPointsReq.readyState == 0) {
		var sw=swlng;
		var ne=nelng;
		//var trans=0;
		//if (swlng>nelng) { //looking at a part of the world that crosses the longitude transition from - to +
		//	trans=1;
		//}
		
		var urlstr='http://schools.guidedstudies.com/search/js2/getschools.php?swlat='+swlat+'&nelat='+nelat+'&swlng='+sw+'&nelng='+ne;//+'&trans='+trans;
		if (! ignoresearch) {
				}
		//alert('calling: '+urlstr);
		dorequest(urlstr);

	}
}
function dorequest(requrl) {
	setIsLooking("<blink><font size=\"2\">searching...</font></blink>");
	lastsearch=requrl;
	getPointsReq.open('GET',requrl,true);
	lastdate = new Date().getTime();
	getPointsReq.onreadystatechange = function () {
		if (getPointsReq.readyState==4) {
			addNewMarkers(lastdate);
		}
	};

	getPointsReq.send(null);
}
function addNewMarkers(reqdate) {
	if (reqdate!=lastdate) {return;}
	//alert("zere we are!"+getPointsReq.readyState);
	if (getPointsReq.readyState!=4) {return;}
	var markstr="("+getPointsReq.responseText+")";
	//alert(markstr);
	var divcount=document.getElementById('curcount');
	//alert("Processing schools JSON");
	//var extraobj=document.getElementById('extradiv');
	//extraobj.innerHTML=markstr;
	if (markstr.length<10) {
		busy=false;
		var statusmsg="NO RESULTS FOUND FOR SEARCH";
		if (searchtermtext.length>0) {
			statusmsg+=" '"+searchtermtext+"'";
		}
		statusmsg+=".";
		setStatus(statusmsg);
		return;
	}
	var markers="d";
	try {
		markers=eval(markstr).datarray;
	}
	catch (errobj) {
		busy=false;
		//alert("JOSN ERROR - retrying page" +errobj+"\n"+markstr);
		dorequest(lastsearch);
		return;
	}
	setIsLooking("");
	//alert("Processed.");
	var first=true;
	currentmarkers=[];
	currentmarkerscount=0;
	var cnt=0;
	var liststr="";
	for (var i=0;i<markers.length;++i) {
//		extraobj.innerHTML+="<br>\n"+id;
		++cnt;
		var mapmovestr="parent.setFocusSchool("+markers[i].id+","+markers[i].latitude+","+markers[i].longitude+",-1);";
		var zoommapmovestr="parent.setFocusSchool("+markers[i].id+","+markers[i].latitude+","+markers[i].longitude+",100);";
		var nomapmovestr="parent.setFocusSchool("+markers[i].id+",-10000,-10000,-1);";
		var expandcontent="detailfocus('schoolcontent"+cnt+"-title','schoolcontent"+cnt+"');";
		liststr+="<a class=\"centermap\" href=\"javascript:void(0);\" onClick=\""+zoommapmovestr+"\">Center Map<br>On School</a>";
		liststr+="<div class=\"schoolink\"><a name=\"schoolcontent"+cnt+"-title\"><span id=\"schoolcontent"+cnt+"-title\"><font size=\"4\">\n";
		liststr+=markers[i].name+"</font></span></a><br/><font color=\"#000000\">\n";
	//	liststr+="<!--<a href=\"javascript:void(0);\" onClick=\""+zoommapmovestr+"\"><img src=\"/images/zoom.png\" border=\"0\"></a>-->";
	liststr+=markers[i].address+"</font>\n";
		liststr+="<div id=\"schoolcontent"+cnt;
		liststr+="\" class=\"switchgroup1\"><font color=\"#000000\">";
		var strcountry=markers[i].country;
		if (strcountry == "United States") {strcountry="U.S.";}
		liststr+=markers[i].city+", "+markers[i].stateprovince+"  "+strcountry+" &nbsp; &nbsp; ";
		
		var directionsurl=markers[i].address+", "+markers[i].city+", "+markers[i].stateprovince+" "+markers[i].country;
		liststr+="<span class=\"directions\"><a href=\"http://maps.google.com/maps?saddr=&daddr="+directionsurl+"\">[ directions ]</a></span><br>\n";
		if (markers[i].web && (markers[i].web.toUpperCase() != "UNKNOWN")) {
			liststr+="<div class=\"hassite\"><a href='http://"+markers[i].web+"' target=\"_new\">"+markers[i].web+"</a></div/>";
		}
		else {
			liststr+="<div class=\"nosite\">No Web Site Known - unverified listing<br/>If you discover that this school does or does not exist, please <a href=\"mailto:schoolsdb@guidedstudies.com?subject=status of school "+markers[i].id+"&body=Here is what I know about "+markers[i].name+"\">let us know</a>.</div>\n";
		}
		liststr+=markers[i].phone+"<br/>";
		if (markers[i].affiliations) {
			liststr+="<div class=\"cat\">Affiliations: "+markers[i].affiliations+"\n</div>";
		}
		if (markers[i].accreditations) {
			liststr+="<div class=\"cat\">Accreditations: "+markers[i].accreditations+"\n</div>";
		}
		if (markers[i].contact) {
			liststr+="<div class=\"cat\">Contact: "+markers[i].contact+"\n</div>";
		}
		if (markers[i].email) {
			liststr+="<div class=\"cat\">Email: "+markers[i].email+"\n</div>";
		}
		if (markers[i].numberstudents) {
			liststr+="<div class=\"cat\">Number of students: "+markers[i].numberstudents+"\n</div>";
		}
		if (markers[i].ages) {
			var ages=markers[i].ages.split("|");
			liststr+="<div class=\"cat\">Ages taught:<br/>";
			for (var a=0;a<ages.length;++a) {
				liststr+=" &nbsp; &nbsp; "+ages[a]+"\n<br/>";
			}
			liststr+="\n</div>";
		}
		if (markers[i].specials) {
			var specials=markers[i].specials.split("|");
			liststr+="<div class=\"cat\">Specials taught:";
			for (var s=0;s<specials.length;++s) {
				liststr+="<br> &nbsp; &nbsp; "+specials[s]+"\n";
			}
			liststr+="</div>";
		}
		if (markers[i].year) {
			liststr+="Year founded: "+markers[i].year+"\n<br/>";
		}
		if (markers[i].lastmodified) {
			liststr+="<div class=\"lastmod\">RECORD LAST MODIFIED: "+markers[i].lastmodified+"\n</div>";
		}
		if (markers[i].id) {
			liststr+="<div class=\"markerid\">school id "+markers[i].id+"</div>\n";
		}
		
		liststr+="</font>\n";

		liststr+="</div></div>";
		var uid=markers[i].id;
		++currentmarkerscount;
		
		html= "<div><p align=\"center\"><a href=\"javascript:void(0);\" onClick=\""+expandcontent+"\">" + markers[i].name + "</a><br/><span class=\"clickdetail\">(click on name to get school detail)</span></p>\n" + markers[i].address + ", " + markers[i].city + "</div>";
	  currentmarkers.push(addMarker(markers[i].latitude, markers[i].longitude, html));
		var point = new GLatLng(markers[i].latitude, markers[i].longitude);
		bounds.extend(point);
	}
	liststr+="<span id=\"lastitemspan\" style=\"visibility: visible\"> </span>\n";
	
	setList(liststr);
	
	if (startZoom==-1) {
		map.setCenter(bounds.getCenter());
		startZoom=map.getBoundsZoomLevel(bounds);
		map.setZoom(startZoom);
	}
	//map.setCenter(bounds.getCenter(), map.getBoundsZoomLevel(bounds)); 
	//if (currentmarkerscount>maxbuffersize) { //if too many, garbage collect ones that are not visible.
	//	removeOldMarkers();
	//}
	var statmsg="Found "+markers.length+" schools ";
	if (searchtermtext.length>0) {
		statmsg+="for term(s) '"+searchtermtext+"'";
	}
	setStatus(statmsg);
	markerCluster.clearMarkers();
	markerCluster.addMarkers(currentmarkers);
	markerCluster.resetViewport();
	currentmarkerscount=currentmarkers.length;
	busy=false;
}

function setStatus(msg) {
	var divcount=document.getElementById('curcount');
	divcount.innerHTML=msg;
	
}
function setIsLooking(msg) {
	var divcount=document.getElementById('islooking');
	divcount.innerHTML=msg;
}


function detailfocus(titleel,contentel) {
	var iframeelem=document.getElementById('schoollist');
	var newdoc=iframeelem.contentDocument;
	if (!newdoc) {
		newdoc=iframeelem.contentWindow.document;
	}
	//iframeelem.contentWindow.hash=titleel;
	var innerel=newdoc.getElementById(titleel);
	var objpos=getObjPos(innerel);
	 try{
	        iframeelem.contentWindow.scroll(0,objpos[1]);
	    }catch(e){}
	    try{
	        iframeelem.contentWindow.scrollTo(0,objpos[1]);
	    }catch(e){}
	    skoolswitch.expandcontent(innerel);
	    //innerel.style.color='#ff0000';
	    //alert(innerel.innerHTML+": "+innerel.id+" = "+innerel.style.color+", "+innerel.className);
//	alert("afocusing on "+titleel+", "+objpos[1]);
//	innerel.focus();
}

function getObjPos(obj) {
	    var curleft = 0;
	      var curtop = 0;
	      if (obj.offsetParent) {
	            do {
	                  curleft += obj.offsetLeft;
	                  curtop += obj.offsetTop;
	            } while (obj = obj.offsetParent);
	      }
	      return [curleft,curtop];
}
function setList(msg) {
	var iframeelem=document.getElementById('schoollist');
	var newdoc=iframeelem.contentDocument;
	if (!newdoc) {
		newdoc=iframeelem.contentWindow.document;
	}
	var innerel=newdoc.getElementById('listinnerel');
	innerel.innerHTML=msg;
	
	skoolswitch=new switchcontent("switchgroup1", "div", newdoc) //Limit scanning of switch contents to just "div" elements
	skoolswitch.setStatus('<span class=\"toggle\"><img src=\"/search/tridown.gif\" border=\"0\" width=\"16\" height=\"16\"></span>', '<span class=\"toggle\"><img src=\"/search/triright.gif\" border=\"0\" width=\"16\" height=\"16\"></span>')
	skoolswitch.setColor('darkred', '')
	skoolswitch.setPersist(false)
	skoolswitch.collapsePrevious(true) //Only one content open at any given time
	skoolswitch.init();
}


function removeOldMarkers() {
	var bnds=map.getBounds();
	var sw=bnds.getSouthWest();
	var ne=bnds.getNorthEast();
	var swlng=sw.lng()+180;
	var nelng=ne.lng()+180;
	var swlat=sw.lat()+90;
	var nelat=ne.lat()+90;
	var newarray=[];
	
	for(i=0;i<currentmarkers.length;++i) {
		marker=currentmarkers[i];
		var lat=marker.getLatLng().lat()+90;
		var lng=marker.getLatLng().lng()+180;
		if (lat<swlat || lat>nelat || lng<swlng || lng>nelng) {
			--currentmarkerscount;
			//markerCluster.removeMarker(marker);
		}
		else {
			newarray.push(marker);
		}
	}
	currentmarkers=newarray;
}
window.onload = init;
window.onunload = google.maps.Unload;