var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = XS.getAsset('heroBullet', 'Hero Bullet Graphics', 0.5, 0.5);
	self.addChild(bulletGraphics);
	self.speed = 10;
	self.move = function () {
		self.y -= self.speed;
	};
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = XS.getAsset('enemyBullet', 'Enemy Bullet Graphics', 0.5, 0.5);
	self.addChild(bulletGraphics);
	self.speed = 5;
	self.move = function () {
		self.x += self.speedX;
		self.y += self.speedY;
	};
});
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = XS.getAsset('hero', 'Hero Spaceship', 0.5, 0.5);
	self.addChild(heroGraphics);
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = XS.getAsset('enemy', 'Enemy Spaceship', 0.5, 0.5);
	self.addChild(enemyGraphics);
	self.speed = 6;
	self.targetY = Math.random() * (2732 / 3);
	self.move = function () {
		if (self.y < self.targetY) {
			self.y += self.speed;
		}
		self.x += Math.sin(XS.ticks / 30) * 5;
		if (self.x < 0) self.x = 0;
		if (self.x > 2048 - enemyGraphics.width) self.x = 2048 - enemyGraphics.width;
	};
});
var StarField = Container.expand(function () {
	var self = Container.call(this);
	var starGraphics = XS.getAsset('star', 'Star Graphics', 0.5, 0.5);
	self.addChild(starGraphics);
	self.speed = Math.random() * 2 + 1;
	self.alpha = self.speed / 3;
	self.move = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.y = -100;
			self.x = Math.random() * 2048;
			self.speed = Math.random() * 2 + 1;
			self.alpha = self.speed / 3;
		}
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var starField = [];
	for (var i = 0; i < 100; i++) {
		var star = new StarField();
		star.x = Math.random() * 2048;
		star.y = Math.random() * 2732;
		starField.push(star);
		self.addChild(star);
	}
	var hero = self.addChild(new Hero());
	hero.x = 1024;
	hero.y = 2400;
	var enemies = [];
	var heroBullets = [];
	var enemyBullets = [];
	var score = 0;
	var currentWave = 0;
	var allEnemiesKilled = true;
	var scoreText = new Text2('0', {
		size: 100,
		font: "'GillSans-Bold',Impact,'Arial Black',Tahoma",
		fill: "#ffffff"
	});
	scoreText.anchor.set(0.5, 0);
	XS.gui.topCenter.addChild(scoreText);
	function spawnWave() {
		for (var i = 0; i < currentWave + 3; i++) {
			var enemy = new Enemy();
			enemy.x = Math.random() * 2048;
			enemy.y = -100 - i * 100;
			enemies.push(enemy);
			self.addChild(enemy);
		}
		allEnemiesKilled = false;
	}
	function fireHeroBullet() {
		var bullet = new HeroBullet();
		bullet.x = hero.x;
		bullet.y = hero.y - 50;
		heroBullets.push(bullet);
		self.addChild(bullet);
	}
	function fireEnemyBullet(enemy) {
		var bullet = new EnemyBullet();
		bullet.x = enemy.x;
		bullet.y = enemy.y + 50;
		var angle = Math.atan2(hero.y - bullet.y, hero.x - bullet.x);
		bullet.speedX = bullet.speed * Math.cos(angle);
		bullet.speedY = bullet.speed * Math.sin(angle);
		enemyBullets.push(bullet);
		self.addChild(bullet);
	}
	function updateGameObjects() {
		enemies.forEach(function (enemy, index) {
			enemy.move();
			if (enemy.y > 2732) {
				enemy.destroy();
				enemies.splice(index, 1);
			}
		});
		heroBullets.forEach(function (bullet, index) {
			bullet.move();
			if (bullet.y < 0) {
				bullet.destroy();
				heroBullets.splice(index, 1);
			}
		});
		enemyBullets.forEach(function (bullet, index) {
			bullet.move();
			if (bullet.y > 2732) {
				bullet.destroy();
				enemyBullets.splice(index, 1);
			}
		});
	}
	function checkCollisions() {
		heroBullets.forEach(function (heroBullet, hIndex) {
			enemies.forEach(function (enemy, eIndex) {
				if (heroBullet.intersects(enemy)) {
					heroBullet.destroy();
					heroBullets.splice(hIndex, 1);
					enemy.destroy();
					enemies.splice(eIndex, 1);
					score += 100;
					scoreText.setText(score);
					if (enemies.length === 0) {
						allEnemiesKilled = true;
					}
				}
			});
		});
		enemyBullets.forEach(function (enemyBullet, index) {
			if (enemyBullet.intersects(hero)) {
				enemyBullet.destroy();
				enemyBullets.splice(index, 1);
				XS.showGameOver();
			}
		});
	}
	var targetPosition = {
		x: hero.x,
		y: hero.y
	};
	stage.on('down', function (obj) {
		targetPosition = obj.event.getLocalPosition(self);
	});
	stage.on('move', function (obj) {
		targetPosition = obj.event.getLocalPosition(self);
	});
	function moveHeroTowardsTarget() {
		var dx = targetPosition.x - hero.x;
		var dy = targetPosition.y - hero.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		var maxSpeed = 15;
		if (distance > maxSpeed) {
			var angle = Math.atan2(dy, dx);
			hero.x += maxSpeed * Math.cos(angle);
			hero.y += maxSpeed * Math.sin(angle);
		} else {
			hero.x = targetPosition.x;
			hero.y = targetPosition.y;
		}
	}
	function handleTick() {
		moveHeroTowardsTarget();
		updateGameObjects();
		checkCollisions();
		starField.forEach(function (star) {
			star.move();
		});
		if (allEnemiesKilled) {
			currentWave++;
			spawnWave();
		}
		if (XS.ticks % 15 === 0) {
			fireHeroBullet();
		}
		enemies.forEach(function (enemy, index) {
			if (XS.ticks % 90 === 0) {
				fireEnemyBullet(enemy);
			}
			if (XS.ticks % 180 === 0 && index % 2 === 0) {
				fireEnemyBullet(enemy);
			}
		});
	}
	XS.on('tick', handleTick);
});