var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('heroBullet', 'Hero Bullet Graphics', .5, .5);
	self.speed = -5;
	self.move = function () {
		self.y += self.speed;
	};
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('enemyBullet', 'Enemy Bullet Graphics', .5, .5);
	self.speed = 5;
	self.move = function () {
		self.y += self.speed;
	};
});
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.createAsset('hero', 'Hero character', .5, .5);
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.createAsset('enemy', 'Enemy character', .5, .5);
	self.height = enemyGraphics.height;
	self.direction = Math.random() < 0.5 ? -1 : 1;
	self.speed = 2;
	self.zigzagFrequency = Math.random() * 60 + 30;
	self.move = function () {
		self.y += self.speed;
		if (LK.ticks % self.zigzagFrequency === 0) {
			self.direction *= -1;
		}
		self.x += self.speed * self.direction;
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var heroBullets = [];
	var enemyBullets = [];
	var enemies = [];
	var initialEnemyCount = 5;
	function respawnEnemy() {
		if (enemies.length < initialEnemyCount) {
			var enemy = new Enemy();
			enemy.x = Math.random() * (2048 - enemy.width) + enemy.width / 2;
			enemy.y = -enemy.height;
			enemies.push(enemy);
			self.addChild(enemy);
		}
	}
	for (var i = 0; i < initialEnemyCount; i++) {
		respawnEnemy();
	}
	var hero = self.addChild(new Hero());
	hero.x = 2048 / 2;
	hero.y = 2732 - 100;
	var spawnEnemy = function () {
		var enemy = new Enemy();
		enemy.x = Math.random() * (2048 - enemy.width) + enemy.width;
		enemy.y = 0;
		enemies.push(enemy);
		self.addChild(enemy);
	};
	var fireHeroBullet = function () {
		var bullet = new HeroBullet();
		bullet.x = hero.x;
		bullet.y = hero.y;
		heroBullets.push(bullet);
		self.addChild(bullet);
	};
	var fireEnemyBullet = function (enemy) {
		var bullet = new EnemyBullet();
		bullet.x = enemy.x;
		bullet.y = enemy.y;
		enemyBullets.push(bullet);
		self.addChild(bullet);
	};
	var handleMove = function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		hero.x = pos.x;
		hero.y = pos.y;
	};
	stage.on('move', handleMove);
	LK.on('tick', function () {
		for (var i = heroBullets.length - 1; i >= 0; i--) {
			heroBullets[i].move();
			if (heroBullets[i].y < -50) {
				heroBullets[i].destroy();
				heroBullets.splice(i, 1);
			} else {
				for (var j = enemyBullets.length - 1; j >= 0; j--) {
					if (heroBullets[i].intersects(enemyBullets[j])) {
						heroBullets[i].destroy();
						heroBullets.splice(i, 1);
						enemyBullets[j].destroy();
						enemyBullets.splice(j, 1);
						break;
					}
				}
			}
		}
		for (var i = enemyBullets.length - 1; i >= 0; i--) {
			enemyBullets[i].move();
			if (enemyBullets[i].y > 2732) {
				enemyBullets[i].destroy();
				enemyBullets.splice(i, 1);
				respawnEnemy();
			}
		}
		for (var i = 0; i < enemies.length; i++) {
			if (Math.random() < 0.001) {
				fireEnemyBullet(enemies[i]);
			}
		}
		if (LK.ticks % 60 == 0) {
			fireHeroBullet();
		}
	});
});