/**** 
* Classes
****/ 
// Projectile class for player's bullets
var PlayerProjectile = Container.expand(function () {
	var self = Container.call(this);
	// Attach bullet sprite
	self.bulletSprite = self.attachAsset('playerBulletSprite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set initial speed (upwards)
	self.speedY = -20;
	// Track lastY for off-screen detection
	self.lastY = self.y;
	// Update method to move projectile
	self.update = function () {
		self.lastY = self.y;
		self.y += self.speedY;
		// Destroy if off screen (top)
		if (self.lastY >= -50 && self.y < -50) {
			self.destroy();
		}
	};
	return self;
});
// PlayerShip class to handle player ship logic and projectile spawn point calculation
var PlayerShip = Container.expand(function () {
	var self = Container.call(this);
	// Attach player ship sprite and set reference for spawn point calculation
	self.shipSprite = self.attachAsset('playerShipSprite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Initialize projectile spawn point
	projectileSpawnPoint.x = self.x;
	projectileSpawnPoint.y = self.y - self.shipSprite.height / 2;
	// Update projectile spawn point every frame based on player ship position
	self.update = function () {
		// Calculate spawn point at the tip of the ship (center top)
		// Get ship asset size
		var shipAsset = self.shipSprite; // must be set in constructor
		if (!shipAsset) return;
		// Ship's local center
		var centerX = self.x;
		var centerY = self.y;
		// The tip of the ship (assuming orientation:2, so tip is at y = y - height/2)
		projectileSpawnPoint.x = centerX;
		projectileSpawnPoint.y = centerY - shipAsset.height / 2;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Projectile spawn point (relative to player ship center)
// Will be updated in PlayerShip class update
var projectileSpawnPoint = {
	x: 0,
	y: 0
};
// Array to keep track of all player projectiles
var playerProjectiles = [];
// Create player ship and add to game
var playerShip = new PlayerShip();
game.addChild(playerShip);
// Center player ship horizontally, place near bottom
playerShip.x = 2048 / 2;
playerShip.y = 2732 - 350;
// Fire projectile on screen tap
game.down = function (x, y, obj) {
	// Create a new projectile at the current spawn point
	var proj = new PlayerProjectile();
	proj.x = projectileSpawnPoint.x;
	proj.y = projectileSpawnPoint.y;
	playerProjectiles.push(proj);
	game.addChild(proj);
};
// Update all projectiles and remove off-screen ones
game.update = function () {
	// Update player ship (to update spawn point)
	if (playerShip && playerShip.update) playerShip.update();
	// Update and clean up projectiles
	for (var i = playerProjectiles.length - 1; i >= 0; i--) {
		var proj = playerProjectiles[i];
		if (proj.update) proj.update();
		// Remove destroyed projectiles
		if (proj.y < -50) {
			proj.destroy();
			playerProjectiles.splice(i, 1);
		}
	}
};