var Knife = Container.expand(function () {
	var self = Container.call(this);
	self.angleTo = function (other) {
		var dx = other.x - self.x;
		var dy = other.y - self.y;
		return Math.atan2(dy, dx);
	};
	var knifeGraphics = self.createAsset('knife', 'Knife Graphics', .5, 0);
	self.speed = 30;
	self.stuck = false;
	self.falling = false;
	self.spinDirection = Math.random() < 0.5 ? -1 : 1;
	self.move = function () {
		if (!self.stuck && !self.falling) {
			self.y -= self.speed;
		}
	};
	self.fall = function () {
		if (self.falling) {
			if (!self.fallInitiated) {
				knifeGraphics.anchor.x = .5;
				knifeGraphics.anchor.y = .5;
				self.x += knifeGraphics.width / 2;
				self.y += knifeGraphics.height / 2;
				self.fallInitiated = true;
			}
			self.y += self.speed;
			self.rotation += self.spinDirection * 0.1;
		}
	};
	self.hit = function (knives) {
		for (var i = 0; i < knives.length; i++) {
			if (knives[i] !== self && knives[i].stuck) {
				var angleDiff = Math.abs((knives[i].hitAngle + Math.PI / 2 - self.hitAngle + Math.PI / 2 + Math.PI) % (2 * Math.PI) - Math.PI);
				if (angleDiff < Math.PI / 18) {
					return true;
				}
			}
		}
		return false;
	};
});
var Target = Container.expand(function () {
	var self = Container.call(this);
	var targetGraphics = self.createAsset('target', 'Target Graphics', .5, .5);
	self.rotationSpeed = 0.01;
	self.rotate = function () {
		self.rotation += self.rotationSpeed;
	};
	self.hit = function () {};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var background = self.createAsset('background', 'Background Graphics', 0, 0);
	background.width = 2048;
	background.height = 2732;
	var knives = [];
	var targets = [];
	var score = 0;
	var lives = 3;
	var scoreTxt = new Text2('Score: ' + score.toString() + ', Lives: ' + lives.toString(), {
		size: 150,
		fill: "#ffffff"
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	var knife = self.addChild(new Knife());
	knife.x = 2048 / 2;
	knife.y = 2732 - 200;
	var target = self.addChild(new Target());
	target.x = 2048 / 2;
	target.y = 2732 / 2;
	stage.on('down', function (obj) {
		var newKnife = new Knife();
		newKnife.x = knife.x;
		newKnife.y = knife.y;
		newKnife.speed = 10;
		knives.push(newKnife);
		self.addChild(newKnife);
	});
	LK.on('tick', function () {
		target.rotate();
		for (var i = 0; i < knives.length; i++) {
			knives[i].move();
			knives[i].fall();
		}
		for (var i = 0; i < knives.length; i++) {
			if (Math.abs(knives[i].y - target.y) <= target.height / 2 && !knives[i].stuck) {
				knives[i].stuck = true;
				knives[i].hitAngle = target.rotation - Math.PI / 2;
				if (knives[i].hit(knives)) {
					knives[i].falling = true;
					lives -= 1;
					scoreTxt.setText('Score: ' + score.toString() + ', Lives: ' + lives.toString());
				} else {
					target.hit();
					score += 1;
					scoreTxt.setText('Score: ' + score.toString() + ', Lives: ' + lives.toString());
				}
			}
			if (knives[i].stuck && !knives[i].falling) {
				knives[i].rotation = target.rotation - knives[i].hitAngle - Math.PI / 2;
				knives[i].x = target.x + Math.cos(target.rotation - knives[i].hitAngle) * target.width / 2;
				knives[i].y = target.y + Math.sin(target.rotation - knives[i].hitAngle) * target.height / 2;
			}
		}
		for (var i = knives.length - 1; i >= 0; i--) {
			if (knives[i].y < -50) {
				knives[i].destroy();
				knives.splice(i, 1);
			}
			if (lives <= 0) {
				LK.showGameOver();
			}
		}
	});
});