/****
* 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.update = function () {
    // Hero update logic
  };
  self.shoot = function () {
    // Hero shoot logic
  };
});
// Bullet class
var Bullet = Container.expand(function () {
  var self = Container.call(this);
  var bulletGraphics = self.createAsset('bullet', 'Hero Bullet', 0.5, 0.5);
  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;
  };
});

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

/****
* Game Code
****/
// Initialize important asset arrays
var heroBullets = [];
var enemies = [];
// Create hero
var hero = game.addChild(new Hero());
hero.x = game.width / 2;
hero.y = game.height - 100;
// Create score display
var scoreTxt = new Text2('0', {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Handle hero dragging
var dragNode = null;
game.on('down', function (obj) {
  dragNode = hero;
});
game.on('move', function (obj) {
  if (dragNode) {
    var pos = obj.event.getLocalPosition(game);
    dragNode.x = pos.x;
  }
});
game.on('up', function (obj) {
  dragNode = null;
});
// Game tick event
LK.on('tick', function () {
  // Update hero
  hero.update();
  // Move and check bullets
  for (var i = heroBullets.length - 1; i >= 0; i--) {
    var bullet = heroBullets[i];
    bullet.move();
    // Check for bullet collision with enemies
    for (var j = enemies.length - 1; j >= 0; j--) {
      if (bullet.intersects(enemies[j])) {
        // Update score
        LK.setScore(LK.getScore() + 1);
        scoreTxt.setText(LK.getScore());
        // Destroy enemy and bullet
        enemies[j].destroy();
        enemies.splice(j, 1);
        bullet.destroy();
        heroBullets.splice(i, 1);
        break;
      }
    }
    // Remove off-screen bullets
    if (bullet.y < -50) {
      bullet.destroy();
      heroBullets.splice(i, 1);
    }
  }
  // Move enemies
  for (var k = enemies.length - 1; k >= 0; k--) {
    enemies[k].move();
    // Check for enemy collision with hero
    if (enemies[k].intersects(hero)) {
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
      return;
    }
  }
  // Spawn enemies
  if (LK.ticks % 120 == 0) {
    var enemy = new Enemy();
    enemy.x = Math.random() * (game.width - enemy.width) + enemy.width / 2;
    enemy.y = -enemy.height;
    enemies.push(enemy);
    game.addChild(enemy);
  }
  // Hero shoots bullets
  if (LK.ticks % 30 == 0) {
    var bullet = new Bullet();
    bullet.x = hero.x;
    bullet.y = hero.y - hero.height / 2;
    heroBullets.push(bullet);
    game.addChild(bullet);
  }
});