var HeroBullet = Container.expand(function() {
    var self = Container.call(this); //{0}
    var bulletGraphics = XS.getAsset('heroBullet', 'Hero Bullet Graphics', 0.5, 0.5);
    self.addChild(bulletGraphics); //{1}
    //{2}
    self.speed = 10;
    //{3}
    self.move = function() { //{4}
        self.y -= self.speed;
    }; //{5}
}); //{6}
//{7}
var EnemyBullet = Container.expand(function() {
    var self = Container.call(this); //{8}
    var bulletGraphics = XS.getAsset('enemyBullet', 'Enemy Bullet Graphics', 0.5, 0.5);
    self.addChild(bulletGraphics); //{9}
    //{10}
    self.speed = 5;
    //{11}
    self.move = function() { //{12}
        self.y += self.speed; //{13}
    }; //{14}
}); //{15}
//{16}
var Hero = Container.expand(function() {
    var self = Container.call(this); //{17}
    var heroGraphics = XS.getAsset('hero', 'Hero Spaceship', 0.5, 0.5);
    self.addChild(heroGraphics);
}); //{18}
//{19}
var Enemy = Container.expand(function() {
    var self = Container.call(this); //{20}
    var enemyGraphics = XS.getAsset('enemy', 'Enemy Spaceship', 0.5, 0.5);
    self.addChild(enemyGraphics);
    //{21}
    self.speed = 3;
    //{22}
    self.move = function() { //{23}
        self.y += self.speed; //{24}
    }; //{25}
}); //{26}
//{27}
var Game = Container.expand(function() {
    var self = Container.call(this); //{28}
    //{29}
    var hero = self.addChild(new Hero());
    hero.x = 1024;
    hero.y = 2400;
    //{30}
    var enemies = [];
    var heroBullets = [];
    var enemyBullets = [];
    var score = 0;
    //{31}
    var scoreText = new Text2('0', {
        size: 100,
        font: "'GillSans-Bold',Impact,'Arial Black',Tahoma",
        fill: "#ffffff"
    }); //{32}
    scoreText.anchor.set(0.5, 0);
    XS.gui.topCenter.addChild(scoreText);
    //{33}
    function spawnEnemy() {
        var enemy = new Enemy();
        enemy.x = Math.random() * 2048;
        enemy.y = -100;
        enemies.push(enemy);
        self.addChild(enemy);
    } //{34}
    //{35}
    function fireHeroBullet() {
        var bullet = new HeroBullet();
        bullet.x = hero.x;
        bullet.y = hero.y - 50;
        heroBullets.push(bullet);
        self.addChild(bullet); //{36}
    } //{37}
    //{38}
    function fireEnemyBullet(enemy) {
        var bullet = new EnemyBullet();
        bullet.x = enemy.x;
        bullet.y = enemy.y + 50;
        enemyBullets.push(bullet);
        self.addChild(bullet); //{39}
    } //{40}
    //{41}
    function updateGameObjects() {
        enemies.forEach(function(enemy, index) {
            enemy.move();
            if (enemy.y > 2732) {
                enemy.destroy(); //{42}
                enemies.splice(index, 1);
            } //{43}
        }); //{44}
        //{45}
        heroBullets.forEach(function(bullet, index) {
            bullet.move(); //{46}
            if (bullet.y < 0) {
                bullet.destroy(); //{47}
                heroBullets.splice(index, 1);
            } //{48}
        }); //{49}
        //{50}
        enemyBullets.forEach(function(bullet, index) {
            bullet.move(); //{51}
            if (bullet.y > 2732) {
                bullet.destroy(); //{52}
                enemyBullets.splice(index, 1); //{53}
            } //{54}
        }); //{55}
    } //{56}
    //{57}
    function checkCollisions() {
        // Check collisions between hero bullets and enemies
        heroBullets.forEach(function(heroBullet, hIndex) {
            enemies.forEach(function(enemy, eIndex) {
                if (heroBullet.intersects(enemy)) {
                    heroBullet.destroy();
                    heroBullets.splice(hIndex, 1);
                    enemy.destroy(); //{58}
                    enemies.splice(eIndex, 1);
                    score += 100;
                    scoreText.setText(score);
                } //{59}
            }); //{60}
        }); //{61}
        //{62}
        // Check collisions between enemy bullets and hero
        enemyBullets.forEach(function(enemyBullet, index) {
            if (enemyBullet.intersects(hero)) {
                enemyBullet.destroy();
                enemyBullets.splice(index, 1); //{63}
                XS.showGameOver();
                // Handle hero hit by enemy bullet
            } //{64}
        }); //{65}
    } //{66}
    //{67}
    function handleTick() {
        updateGameObjects();
        checkCollisions();
        //{68}
        if (XS.ticks % 60 === 0) {
            spawnEnemy();
        } //{69}
        //{70}
        if (XS.ticks % 30 === 0) {
            fireHeroBullet();
        } //{71}
        //{72}
        enemies.forEach(function(enemy) {
            if (XS.ticks % 90 === 0) {
                fireEnemyBullet(enemy);
            } //{73}
        }); //{74}
    } //{75}
    //{76}
    XS.on('tick', handleTick);
    //{77}
    stage.on('down', function(obj) {
        var pos = obj.event.getLocalPosition(self); //{78}
        hero.x = pos.x; //{79}
        hero.y = pos.y; //{80}
    }); //{81}
    //{82}
    stage.on('move', function(obj) {
        var pos = obj.event.getLocalPosition(self); //{83}
        hero.x = pos.x; //{84}
        hero.y = pos.y; //{85}
    }); //{86}
}); //{87}