/****
* Classes
****/
// Enemy class
var Enemy = Container.expand(function () {
  var self = Container.call(this);
  var enemyGraphics = self.attachAsset('enemy', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 2;
  self.move = function () {
    self.y += self.speed;
  };
});
// EnemyBullet class
var EnemyBullet = Container.expand(function () {
  var self = Container.call(this);
  var bulletGraphics = self.attachAsset('enemyBullet', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 5;
  self.move = function () {
    self.y += self.speed;
  };
});
// Assets will be automatically generated based on usage in the code.
// Hero class
var Hero = Container.expand(function () {
  var self = Container.call(this);
  var heroGraphics = self.attachAsset('hero', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.move = function (x, y) {
    self.x = x;
    self.y = y;
  };
  self.shoot = function () {
    var bullet = new HeroBullet();
    bullet.x = self.x;
    bullet.y = self.y - 50; // Shoot from above the hero
    game.addChild(bullet);
    heroBullets.push(bullet);
  };
});
// HeroBullet class
var HeroBullet = Container.expand(function () {
  var self = Container.call(this);
  var bulletGraphics = self.attachAsset('heroBullet', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = -10;
  self.move = function () {
    self.y += self.speed;
  };
});

/****
* Initialize Game
****/
var game = new LK.Game({
  backgroundColor: 0x000000 // Init game with black background 
});

/****
* Game Code
****/
// Global variables
var hero = new Hero();
hero.x = 1024; // Center horizontally
hero.y = 2500; // Near the bottom
var heroBullets = [];
var enemies = [];
var enemyBullets = [];
// Add hero to the game
game.addChild(hero);
// Touch event to move hero and shoot
game.on('down', function (obj) {
  var pos = obj.event.getLocalPosition(game);
  hero.move(pos.x, pos.y);
  hero.shoot();
});
// Game tick event
LK.on('tick', function () {
  // Move hero bullets
  for (var i = heroBullets.length - 1; i >= 0; i--) {
    heroBullets[i].move();
    if (heroBullets[i].y < 0) {
      // Bullet off-screen
      heroBullets[i].destroy();
      heroBullets.splice(i, 1);
    }
  }
  // Move enemies and enemy bullets
  for (var j = enemies.length - 1; j >= 0; j--) {
    enemies[j].move();
    if (enemies[j].y > 2732) {
      // Enemy off-screen
      enemies[j].destroy();
      enemies.splice(j, 1);
    }
  }
  for (var k = enemyBullets.length - 1; k >= 0; k--) {
    enemyBullets[k].move();
    if (enemyBullets[k].y > 2732) {
      // Bullet off-screen
      enemyBullets[k].destroy();
      enemyBullets.splice(k, 1);
    }
    // Check collision with hero
    if (hero.intersects(enemyBullets[k])) {
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
    }
  }
  // Spawn enemies and bullets
  if (LK.ticks % 120 == 0) {
    // Every 2 seconds
    var enemy = new Enemy();
    enemy.x = Math.random() * 2048;
    enemy.y = 0;
    game.addChild(enemy);
    enemies.push(enemy);
    var enemyBullet = new EnemyBullet();
    enemyBullet.x = enemy.x;
    enemyBullet.y = enemy.y + 50;
    game.addChild(enemyBullet);
    enemyBullets.push(enemyBullet);
  }
});