/****
* Classes
****/
// Hero class
var Hero = Container.expand(function () {
  var self = Container.call(this);
  var heroGraphics = self.createAsset('hero', 'Hero character', 0.5, 0.5);
  self.speed = 5;
  self.bulletCooldown = 0;
  self.moveLeft = function () {
    self.x = Math.max(self.width / 2, self.x - self.speed);
  };
  self.moveRight = function () {
    self.x = Math.min(2048 - self.width / 2, self.x + self.speed);
  };
  self.shoot = function () {
    if (self.bulletCooldown <= 0) {
      var bullet = new HeroBullet();
      bullet.x = self.x;
      bullet.y = self.y - self.height / 2;
      game.addChild(bullet);
      bullets.push(bullet);
      self.bulletCooldown = 20; // Cooldown period before next shot
    }
  };
  self.update = function () {
    if (self.bulletCooldown > 0) {
      self.bulletCooldown--;
    }
  };
});
// HeroBullet class
var HeroBullet = Container.expand(function () {
  var self = Container.call(this);
  var bulletGraphics = self.createAsset('heroBullet', 'Hero bullet', 0.5, 1);
  self.speed = -10;
  self.move = function () {
    self.y += self.speed;
  };
});
// Enemy class
var Enemy = Container.expand(function () {
  var self = Container.call(this);
  var enemyGraphics = self.createAsset('enemy', 'Enemy character', 0.5, 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.createAsset('enemyBullet', 'Enemy bullet', 0.5, 0);
  self.speed = 5;
  self.move = function () {
    self.y += self.speed;
  };
});

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

/****
* Game Code
****/
// Initialize important asset arrays
var bullets = [];
var enemies = [];
var enemyBullets = [];
var score = 0;
var hero = game.addChild(new Hero());
hero.x = 1024; // Center of the screen
hero.y = 2732 - 200; // Near the bottom of the screen
// Score display
var scoreTxt = new Text2('0', {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Touch controls
game.on('down', function (obj) {
  var touchPos = obj.event.getLocalPosition(game);
  if (touchPos.x < 1024) {
    hero.moveLeft();
  } else {
    hero.moveRight();
  }
  hero.shoot();
});
// Game tick event
LK.on('tick', function () {
  // Update hero
  hero.update();
  // Move and check bullets
  for (var i = bullets.length - 1; i >= 0; i--) {
    bullets[i].move();
    if (bullets[i].y < -bullets[i].height) {
      bullets[i].destroy();
      bullets.splice(i, 1);
    } else {
      // Check for bullet collision with enemies
      for (var j = enemies.length - 1; j >= 0; j--) {
        if (bullets[i].intersects(enemies[j])) {
          enemies[j].destroy();
          enemies.splice(j, 1);
          bullets[i].destroy();
          bullets.splice(i, 1);
          score += 10;
          scoreTxt.setText(score.toString());
          break;
        }
      }
    }
  }
  // Move and check enemy bullets
  for (var k = enemyBullets.length - 1; k >= 0; k--) {
    enemyBullets[k].move();
    if (enemyBullets[k].y > 2732 + enemyBullets[k].height) {
      enemyBullets[k].destroy();
      enemyBullets.splice(k, 1);
    } else if (enemyBullets[k].intersects(hero)) {
      // Game over condition
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
    }
  }
  // Move enemies and potentially shoot
  for (var l = enemies.length - 1; l >= 0; l--) {
    enemies[l].move();
    if (Math.random() < 0.01) {
      // Random chance to shoot
      var enemyBullet = new EnemyBullet();
      enemyBullet.x = enemies[l].x;
      enemyBullet.y = enemies[l].y + enemies[l].height / 2;
      game.addChild(enemyBullet);
      enemyBullets.push(enemyBullet);
    }
  }
  // Spawn enemies
  if (LK.ticks % 120 == 0) {
    // Every 2 seconds
    var newEnemy = new Enemy();
    newEnemy.x = Math.random() * (2048 - newEnemy.width) + newEnemy.width / 2;
    newEnemy.y = -newEnemy.height / 2;
    enemies.push(newEnemy);
    game.addChild(newEnemy);
  }
});