var map = null;
var anchorIcon = null;
var clusterIcon = null;
var points = [];
var clusters = [];

function inPoly(poly, pt){
	var i, j;
	var c = false;
	var npol = poly.length - 1;
	var x = pt.x;
	var y = pt.y;
	for (i = 0, j = npol-1; i < npol; j = i++) {
	if ((((poly[i].y <= y) && (y < poly[j].y)) ||
		 ((poly[j].y <= y) && (y < poly[i].y))) &&
		(x < (poly[j].x - poly[i].x) * (y - poly[i].y) / (poly[j].y - poly[i].y) + poly[i].x))
	  c = !c;
	}
	return c;
}

function zoomCluster(id)
{
	var cluster = clusters[id];
	var pt = points[cluster.points[0]];
	map.setCenter(pt.latlng, map.getZoom() + 2);
}

function getXY(latlng)
{
	return map.getCurrentMapType().getProjection().fromLatLngToPixel(latlng, map.getZoom());	
}

function isNear(x1, y1, x2, y2)
{
	return Math.abs(x2 - x1) < 20 && Math.abs(y2 - y1) < 20;	
}

function findNearestCluster(pt)
{
	var nearest = -1;
	var pos = getXY(pt);
	var min_dist = 9999;
	for (i in clusters) {
		var dx = clusters[i].x - pos.x;
		var dy = clusters[i].y - pos.y;
		var dist = Math.sqrt(dx * dx + dy * dy);
		if (nearest < 0 || dist < min_dist) {
			nearest = i;
			min_dist = dist;
		}	
	}
	return {cluster: nearest, dist: min_dist};
}

function highlight(id)
{
	var pt = points[id];
	map.setCenter(pt.latlng, map.getZoom());
	clusters[pt.cluster].marker.openInfoWindowHtml(pt.desc);
}

function buildMap()
{
	for (i in clusters) map.removeOverlay(clusters[i].marker);
	clusters = [];
	for (i in points) {
		pt = points[i];
		pos = getXY(pt.latlng);
		for (j = 0; j < clusters.length; j++) 
			if (isNear(pos.x, pos.y, clusters[j].x, clusters[j].y)) break;
		if (j == clusters.length) {
			clusters.push({x: pos.x, y: pos.y, points: [i]});
		} else clusters[j].points.push(i);		
		points[i].cluster = j;	
	}
	for (i in clusters) {
		cluster = clusters[i];
		if (cluster.points.length > 1) {
			cluster.marker = createCluster(i);
		} else {
			cluster.marker = createMarker(cluster.points[0]);			
		}
		map.addOverlay(cluster.marker);
	}
}

function createCluster(id) {
	var cluster = clusters[id];
	var pt = points[cluster.points[0]];
	var marker = new GMarker(pt.latlng, {icon: clusterIcon});
	GEvent.addListener(marker, "click", function() {
		zoomCluster(id);
	});
	GEvent.addListener(marker, "mouseover", function() {
		marker.openInfoWindowHtml('<p>Bu bölgede ' + cluster.points.length + ' adet koy/demir yeri bulunuyor.</p><p>Yakınlaşmak için <a href="javascript:zoomCluster(' + id + ')">buraya</a> tıklayın.');
	});	 	  
	return marker;	
}

function initMap(opts)
{
	map = new GMap2(document.getElementById("map"), opts);
	map.addControl(new GSmallMapControl());
	map.addControl(new GMapTypeControl());
	
    anchorIcon = new GIcon();
    anchorIcon.image = "images/anchor_icon.gif";
    anchorIcon.shadow = "images/anchor_icon_shadow.png";
    anchorIcon.iconSize = new GSize(15.0, 15.0);
    anchorIcon.shadowSize = new GSize(23.0, 15.0);
    anchorIcon.iconAnchor = new GPoint(7.0, 7.0);
    anchorIcon.infoWindowAnchor = new GPoint(7.0, 7.0);	
	
    clusterIcon = new GIcon();
    clusterIcon.image = "images/anchor_icon_purple.gif";
    clusterIcon.shadow = "images/anchor_icon_shadow.png";
    clusterIcon.iconSize = new GSize(15.0, 15.0);
    clusterIcon.shadowSize = new GSize(23.0, 15.0);
    clusterIcon.iconAnchor = new GPoint(7.0, 7.0);
    clusterIcon.infoWindowAnchor = new GPoint(7.0, 7.0);
	
	GEvent.addListener(map, "zoomend", function(oldLevel, newLevel) {
		buildMap();
	});	
}