dojo.provide("dojo.widget.html.YahooMap");
dojo.require("dojo.event.*");
dojo.require("dojo.html");
dojo.require("dojo.math");
dojo.require("dojo.widget.HtmlWidget");
dojo.require("dojo.widget.YahooMap");

(function(){
	var yappid = djConfig["yAppId"]||djConfig["yahooAppId"]||"dojotoolkit";
	if(!dojo.hostenv.post_load_){
		if(yappid == "dojotoolkit"){
			dojo.debug("please provide a unique Yahoo App ID in djConfig.yahooAppId when using the map widget");
		}
		var tag = "<scr"+"ipt src='http://api.maps.yahoo.com/ajaxymap?v=3.0&appid="+yappid+"'></scri"+"pt>";
		if(!dj_global["YMap"]){
			document.write(tag);
		}
	}else{
		dojo.debug("cannot initialize map system after the page has been loaded! Please either manually include the script block provided by Yahoo in your page or require() the YahooMap widget before onload has fired");
	}
})();

dojo.widget.html.YahooMap=function(){
	dojo.widget.HtmlWidget.call(this);
	dojo.widget.YahooMap.call(this);

	this.map=null;
	this.datasrc="";
	this.data=[];
	this.width=0;
	this.height=0;
	this.controls=["zoomlong","maptype","pan"];
};
dojo.inherits(dojo.widget.html.YahooMap, dojo.widget.HtmlWidget);

dojo.lang.extend(dojo.widget.html.YahooMap, {
	widgetType: "YahooMap",
	templatePath:null,
	templateCssPath:null,

	findCenter:function(aPts){
		var start=new YGeoPoint(37,-90);
		if(aPts.length==0) return start;
		var minLat,maxLat, minLon, maxLon, cLat, cLon;
		minLat=maxLat=aPts[0].Lat;
		minLon=maxLon=aPts[0].Lon;
		for(var i=0; i<aPts.length; i++){
			minLat=Math.min(minLat,aPts[i].Lat);
			maxLat=Math.max(maxLat,aPts[i].Lat);
			minLon=Math.min(minLon,aPts[i].Lon);
			maxLon=Math.max(maxLon,aPts[i].Lon);
		}
		cLat=dojo.math.round((minLat+maxLat)/2,6);
		cLon=dojo.math.round((minLon+maxLon)/2,6);
		return new YGeoPoint(cLat,cLon);
	},
	setControls:function(){
		var c=this.controls;
		var t=dojo.widget.YahooMap.Controls;
		for(var i=0; i<c.length; i++){
			switch(c[i]){
				case t.MapType:{
					this.map.addTypeControl();
					break;
				}
				case t.Pan:{
					this.map.addPanControl();
					break;
				}
				case t.ZoomLong:{
					this.map.addZoomLong();
					break;
				}
				case t.ZoomShort:{
					this.map.addZoomShort();
					break;
				}
			}
		}
	},
	
	parse:function(table){
		this.data=[];

		//	get the column indices
		var h=table.getElementsByTagName("thead")[0];
		if(!h){
			return;
		}

		var a=[];
		var cols=h.getElementsByTagName("td");
		if(cols.length==0){
			cols=h.getElementsByTagName("th");
		}
		for(var i=0; i<cols.length; i++){
			var c=cols[i].innerHTML.toLowerCase();
			if(c=="long") c="lng";
			a.push(c);
		}
		
		//	parse the data
		var b=table.getElementsByTagName("tbody")[0];
		if(!b){
			return;
		}
		for(var i=0; i<b.childNodes.length; i++){
			if(!(b.childNodes[i].nodeName&&b.childNodes[i].nodeName.toLowerCase()=="tr")){
				continue;
			}
			var cells=b.childNodes[i].getElementsByTagName("td");
			var o={};
			for(var j=0; j<a.length; j++){
				var col=a[j];
				if(col=="lat"||col=="lng"){
					o[col]=parseFloat(cells[j].innerHTML);					
				}else{
					o[col]=cells[j].innerHTML;
				}
			}
			this.data.push(o);
		}
	},
	render:function(){
		var pts=[];
		var d=this.data;
		for(var i=0; i<d.length; i++){
			var pt=new YGeoPoint(d[i].lat, d[i].lng);
			pts.push(pt);
			var icon=d[i].icon||null;
			if(icon){
				icon=new YImage(icon);
			}
			var m=new YMarker(pt,icon);
			if(d[i].description){
				m.addAutoExpand("<div>"+d[i].description+"</div>");
			}
			this.map.addOverlay(m);
		}
		var c=this.findCenter(pts);
		var z=this.map.getZoomLevel(pts);
		this.map.drawZoomAndCenter(c,z);
	},
	
	initialize:function(args, frag){
		if(!YMap || !YGeoPoint){
			dojo.raise("dojo.widget.YahooMap: The Yahoo Map script must be included in order to use this widget.");
		}
		if(this.datasrc){
			this.parse(dojo.byId(this.datasrc));
		}
		else if(this.domNode.getElementsByTagName("table")[0]){
			this.parse(this.domNode.getElementsByTagName("table")[0]);
		}
	},
	postCreate:function(){
		//	clean the domNode before creating the map.
		while(this.domNode.childNodes.length>0){
			this.domNode.removeChild(this.domNode.childNodes[0]);
		}

		if(this.width>0&&this.height>0){
			this.map=new YMap(this.domNode, YAHOO_MAP_REG, new YSize(this.width, this.height));
		}else{
			this.map=new YMap(this.domNode);
		}
		this.setControls();
		this.render();
	}
});
