/****
* Classes
****/
// EnemyLaser class
var EnemyLaser = Container.expand(function (x, y) {
  var self = Container.call(this);
  var enemyLaserGraphics = self.attachAsset('enemylaser', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.x = x;
  self.y = y;
  self.speed = 10;
  self.update = function () {
    self.y += self.speed;
    if (self.y > 2732) {
      self.destroy();
    }
  };
});
// EnemyShip class
var EnemyShip = Container.expand(function () {
  var self = Container.call(this);
  var enemyGraphics = self.attachAsset('enemyship', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 5;
  self.update = function () {
    self.y += self.speed;
    if (self.y > 2732) {
      self.destroy();
    }
  };
  self.shoot = function () {
    var enemyLaser = new EnemyLaser(self.x, self.y + enemyGraphics.height / 2);
    game.addChild(enemyLaser);
    enemyLasers.push(enemyLaser);
  };
});
// Laser class
var Laser = Container.expand(function (x, y) {
  var self = Container.call(this);
  var laserGraphics = self.attachAsset('laser', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.x = x;
  self.y = y;
  self.speed = -15;
  self.update = function () {
    self.y += self.speed;
    if (self.y < 0) {
      self.destroy();
    }
  };
});
//<Assets used in the game will automatically appear here>
// SpaceShip class
var SpaceShip = Container.expand(function () {
  var self = Container.call(this);
  var shipGraphics = self.attachAsset('spaceship', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 10;
  self.update = function () {
    // Update logic for spaceship
  };
  self.shoot = function () {
    var laser = new Laser(self.x, self.y - shipGraphics.height / 2);
    game.addChild(laser);
    lasers.push(laser);
  };
});

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

/****
* Game Code
****/
// Initialize arrays and variables
var spaceship;
var enemies = [];
var lasers = [];
var enemyLasers = [];
var score = 0;
var scoreTxt = new Text2('0', {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Create spaceship
spaceship = new SpaceShip();
spaceship.x = 2048 / 2;
spaceship.y = 2732 - 200;
game.addChild(spaceship);
// Spawn enemies
function spawnEnemy() {
  var enemy = new EnemyShip();
  enemy.x = Math.random() * 2048;
  enemy.y = -100;
  enemies.push(enemy);
  game.addChild(enemy);
}
// Handle game updates
game.update = function () {
  // Update spaceship
  spaceship.update();
  // Update lasers
  for (var i = lasers.length - 1; i >= 0; i--) {
    lasers[i].update();
    if (lasers[i].y < 0) {
      lasers[i].destroy();
      lasers.splice(i, 1);
    }
  }
  // Update enemy lasers
  for (var i = enemyLasers.length - 1; i >= 0; i--) {
    enemyLasers[i].update();
    if (enemyLasers[i].y > 2732) {
      enemyLasers[i].destroy();
      enemyLasers.splice(i, 1);
    }
  }
  // Update enemies
  for (var i = enemies.length - 1; i >= 0; i--) {
    enemies[i].update();
    if (enemies[i].y > 2732) {
      enemies[i].destroy();
      enemies.splice(i, 1);
    }
  }
  // Check for collisions
  for (var i = lasers.length - 1; i >= 0; i--) {
    for (var j = enemies.length - 1; j >= 0; j--) {
      if (lasers[i].intersects(enemies[j])) {
        lasers[i].destroy();
        enemies[j].destroy();
        lasers.splice(i, 1);
        enemies.splice(j, 1);
        score++;
        scoreTxt.setText(score);
        break;
      }
    }
  }
  for (var i = enemyLasers.length - 1; i >= 0; i--) {
    if (enemyLasers[i].intersects(spaceship)) {
      enemyLasers[i].destroy();
      enemyLasers.splice(i, 1);
      // Flash screen red for 1 second (1000ms) to show we are dead.
      LK.effects.flashScreen(0xff0000, 1000);
      // Show game over. The game will be automatically paused while game over is showing.
      LK.showGameOver(); // Calling this will destroy the 'Game' and reset entire game state.
      break;
    }
  }
  // Spawn enemies periodically
  if (LK.ticks % 60 == 0) {
    spawnEnemy();
  }
  // Enemies shoot periodically
  if (LK.ticks % 120 == 0) {
    for (var i = 0; i < enemies.length; i++) {
      enemies[i].shoot();
    }
  }
};
// Handle touch events
game.down = function (x, y, obj) {
  spaceship.shoot();
};
game.move = function (x, y, obj) {
  spaceship.x = x;
  spaceship.y = y;
};
game.up = function (x, y, obj) {
  // No action needed on touch up
};