// ---
// Copyright (c) 2010 Francesco Cottone, http://www.kesiev.com/
// ---

/**
 * Iphopad module provides a touchpad for touch-based device (for now, Android and iDevices).
 */
var iphopad={
	_buttonsize:50,
	_buttonsize2:100,
	_buttonsize3:150,
	_gapx:0,
	_gapy:0,
	_width:0,
	_height:0,
	_center:{},
	_cross:{up:false,down:false,left:false,right:false},
	_buttons:{a:false,b:false,c:false},
	_transl:(Math.PI*0.125),
	_brad:(Math.PI*0.25),
	_positions:[
		{up:false,down:false,left:false,right:true},
		{up:false,down:true,left:false,right:true},
		{up:false,down:true,left:false,right:false},
		{up:false,down:true,left:true,right:false},
		{up:false,down:false,left:true,right:false},
		{up:true,down:false,left:true,right:false},
		{up:true,down:false,left:false,right:false},
		{up:true,down:false,left:false,right:true}
	],
	_swap:false,
	_listen:function(e) {
		var nc={up:false,down:false,left:false,right:false};
		var nb={a:false,b:false,c:false};
		for (var i=0;i<e.touches.length;i++) {
			rp={x:e.touches[i].pageX-iphopad._gapx,y:e.touches[i].pageY-iphopad._gapy};
			if (rp.x<iphopad._height)
				nc=iphopad._positions[Math.floor(trigo.getAngle(iphopad._center,rp,iphopad._transl)/iphopad._brad)];
			else if (rp.x>iphopad._width-iphopad._buttonsize)
					nb.a=true;
				else if (rp.x>iphopad._width-iphopad._buttonsize2)
					nb.b=true;
				else if (rp.x>iphopad._width-iphopad._buttonsize3)
					nb.c=true;
			
		}
		this._swap=!this._swap;
		for (var i in this._cross) {
			if (nc[i]!=iphopad._cross[i])
				if (nc[i]) gbox._keydown({fake:true,keyCode:gbox._keymap[i]});
				else gbox._keyup({fake:true,keyCode:gbox._keymap[i]});
		}
		for (var i in this._buttons) {
			if (nb[i]!=iphopad._buttons[i])
				if (nb[i]) gbox._keydown({fake:true,keyCode:gbox._keymap[i]});
				else gbox._keyup({fake:true,keyCode:gbox._keymap[i]});
		}
		
		iphopad._cross=nc;
		iphopad._buttons=nb;
	},
	_fakelisten:function(e) {
		iphopad._listen({
			touches:[
				{
					pageX:e.clientX,
					pageY:e.clientY
				}
			]
		});
	},
	
	/**
	* Initializes the game controls for use with an I-product or Android device.
	* @param {Object} data passes in information about the screen and its traits such as size. 
	*/
	initialize:function(data) {
		var oElement=document.createElement("div");
		oElement.style.margin="auto";
		oElement.style.padding="0px";
		oElement.style.height=data.h+"px";
		oElement.style.width="100%";
		oElement.style.backgroundImage="url("+data.bg+")";
		oElement.style.backgroundRepeat="repeat-x";
		
		var tpad=document.createElement("div");
		tpad.style.cssFloat="left";
		tpad.style.padding="0px";
		tpad.style.margin="0px";
		tpad.style.height=data.h+"px";
		tpad.style.width=data.h+"px";
		tpad.style.backgroundImage="url("+data.dpad+")";
		tpad.style.backgroundRepeat="no-repeat";

		var bpad=document.createElement("div");
		bpad.style.cssFloat="right";
		bpad.style.padding="0px";
		bpad.style.margin="0px";
		bpad.style.height=data.h+"px";
		bpad.style.width=iphopad._buttonsize3+"px";
		bpad.style.backgroundImage="url("+data.buttons+")";
		bpad.style.backgroundRepeat="no-repeat";
		
		oElement.appendChild(tpad);
		oElement.appendChild(bpad);
		gbox._box.appendChild(oElement);

		oElement.ontouchstart=function(evt) { evt.preventDefault();evt.stopPropagation(); iphopad._listen(evt) };
		oElement.ontouchend=function(evt) { evt.preventDefault();evt.stopPropagation();iphopad._listen(evt) };
		oElement.ontouchmove=function(evt) { evt.preventDefault();evt.stopPropagation();iphopad._listen(evt) };
		//oElement.onmousemove=function(evt) { iphopad._fakelisten(evt) };
		var sizes=gbox._domgetabsposition(oElement);
		this._gapx=sizes.x;
		this._gapy=sizes.y;
		this._width=sizes.w;
		this._height=sizes.h;
		this._center={x:Math.floor(this._height/2),y:Math.floor(this._height/2)};			
	}
	
}