import flash.events.MouseEvent;

// add event listener to rotate cannon when mouse moves
stage.addEventListener(MouseEvent.MOUSE_MOVE, rotateCannon);

// add event listener to call fireBullet function on each mouse click
stage.addEventListener(MouseEvent.CLICK, fireBullet);

// add event listener to execute moveBullet each time frame 1 repeats
stage.addEventListener(Event.ENTER_FRAME,moveBullet);

var xDiff, yDiff:Number;
var radians:Number;
var degrees:Number;
var speed:int = 5;

function moveBullet(evt:Event):void
{
	// only execute if we have some children
	// of bulletContain, in this case bullets)
	if(bulletContainer.numChildren > 0)
	{
		// loop through all bullets
		for(var b = 0; b<=bulletContainer.numChildren - 1; b++)
		{
			// references each child and assigns value to tempBullet
			var tempBullet = bulletContainer.getChildAt(b);
			
			// add movement from fireBullet function newBullet.xMov & newBullet.yMov
			tempBullet.x += tempBullet.xMov;
			tempBullet.y += tempBullet.yMov;

			if(tempBullet.x < 0 || tempBullet.x > stage.stageWidth || tempBullet.y < 0 || tempBullet.y > stage.stageHeight)
			{
				// remove in opposite order that bullet was added
				// removing bullet from bulletContainer
				bulletContainer.removeChild(tempBullet);
				trace(bulletContainer.numChildren);
			}

			if(tempBullet.hitTestObject(target))
			{
				bulletContainer.removeChild(tempBullet);
			}

		}
	}
}


function fireBullet(evt:MouseEvent):void
{
	//get "bullet" from library linkage constructor
	var newBullet:bullet = new bullet();
	
	// start position of newBullet at end of cannon
	newBullet.x = cannon.x + Math.cos(radians) * 50;
	newBullet.y = cannon.y + Math.sin(radians) * 50;

	// move along x-axis
	newBullet.xMov = Math.cos(radians) * speed;
	
	// move along y-axis
	newBullet.yMov = Math.sin(radians) * speed;

	//In action script the addChild draws to screen
	//making it a child of bulletContainer instance
	// Timeline tab > select bullets layer > hide other layers
	// > highlight object & check Properties
	bulletContainer.addChild(newBullet);
}


function rotateCannon(evt:MouseEvent):void
{
	xDiff = mouseX - cannon.x;
	yDiff = mouseY - cannon.y;
	radians = Math.atan2(yDiff, xDiff);
	degrees = radians * 180 / Math.PI;
	cannon.rotation = degrees;
	rotationAmount.text = String(Math.round(degrees) + " degrees");
	//drawLine();
}