var pointName, mapLat, mapLong, listingPoint, map, revDiv, impRevReq;

function toggleMap(latitude,longitude,name) {
	toggle('mapSlideOpen','map');

	if(!mapLat && !mapLong) {
		mapLat=latitude; mapLong=longitude;
		pointName = name;

		var script = document.createElement("script");
		script.type = "text/javascript";
		script.src = "http://maps.google.com/maps/api/js?sensor=false&async=2&callback=mapLoaded";
		document.body.appendChild(script);
	}
}

function fetchImpRev(hID) {
	if(typeof(revDiv) == "undefined") {
		revDiv = document.getElementById('impRev');
		url = '/hostelFetchImpReviews.php?id='+hID;

		impRevReq = new XMLHttpRequest();
		impRevReq.onreadystatechange = fetchImpRevResp;
		try { impRevReq.open("GET", url, true); } catch (e) { alert(e); }
		impRevReq.send(null);
	}
}
function fetchImpRevResp() {
	if(impRevReq.readyState != 4) return;
	if(impRevReq.status == 200) { // OK response
		revDiv.innerHTML = impRevReq.responseText;
	} else {
		alert("Error: "+impRevReq.statusText);
	}
}

function mapLoaded() {
	listingPoint = new google.maps.LatLng(mapLat,mapLong);
    map = new google.maps.Map(document.getElementById("mapCanvas"), 
		{ zoom: 12, center: listingPoint, mapTypeId: google.maps.MapTypeId.ROADMAP });
	var marker = new google.maps.Marker({ position: listingPoint, title: pointName, map: map });
}

var dirDisplay, dirService;

function mapAddMarker(lat,lon,name) {
	new google.maps.Marker({ position: new google.maps.LatLng(lat,lon), title: name, map: map });
}

function mapDirections(lat,lon, isWalkable) {
	if(lat==0 && lon==0) { /* clear */
		if(dirDisplay) dirDisplay.setMap(null);
		document.getElementById("mapDirections").innerHTML = '';
		map.setCenter(listingPoint, 12);
		return;
	}
	if(!dirDisplay) {
		dirService = new google.maps.DirectionsService();
		dirDisplay = new google.maps.DirectionsRenderer({ panel: document.getElementById("mapDirections")} );
	}
	dirDisplay.setMap(map);
	dirService.route({ origin: new google.maps.LatLng(lat,lon), destination:listingPoint, travelMode: isWalkable?google.maps.DirectionsTravelMode.WALKING : google.maps.DirectionsTravelMode.DRIVING }, function(response, status) {
      if (status == google.maps.DirectionsStatus.OK) {
        dirDisplay.setDirections(response);
      }
    });
}