/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
var EnemyShip = Container.expand(function () {
	var self = Container.call(this);
	var shipGraphics = self.attachAsset('enemyShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -12;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var PlayerShip = Container.expand(function () {
	var self = Container.call(this);
	var shipGraphics = self.attachAsset('playerShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000033
});

/**** 
* Game Code
****/ 
// Create score display
var scoreTxt = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Create player ship
var player = game.addChild(new PlayerShip());
player.x = 2048 / 2;
player.y = 2732 - 150;
// Game arrays
var bullets = [];
var enemies = [];
// Game variables
var lastShootTime = 0;
var shootInterval = 10; // Shoot every 10 ticks (6 times per second)
var enemySpawnTimer = 0;
var enemySpawnInterval = 60; // Spawn enemy every 60 ticks (1 per second)
// Touch/drag handling
var isDragging = false;
game.down = function (x, y, obj) {
	isDragging = true;
	player.x = Math.max(40, Math.min(2048 - 40, x));
};
game.move = function (x, y, obj) {
	if (isDragging) {
		player.x = Math.max(40, Math.min(2048 - 40, x));
	}
};
game.up = function (x, y, obj) {
	isDragging = false;
};
// Main game update loop
game.update = function () {
	// Auto-shoot bullets
	if (LK.ticks - lastShootTime >= shootInterval) {
		var newBullet = new PlayerBullet();
		newBullet.x = player.x;
		newBullet.y = player.y - 50;
		newBullet.lastY = newBullet.y;
		bullets.push(newBullet);
		game.addChild(newBullet);
		lastShootTime = LK.ticks;
		LK.getSound('shoot').play();
	}
	// Spawn enemies
	enemySpawnTimer++;
	if (enemySpawnTimer >= enemySpawnInterval) {
		var newEnemy = new EnemyShip();
		newEnemy.x = Math.random() * (2048 - 100) + 50;
		newEnemy.y = -30;
		newEnemy.lastY = newEnemy.y;
		newEnemy.lastPlayerIntersecting = false;
		enemies.push(newEnemy);
		game.addChild(newEnemy);
		enemySpawnTimer = 0;
	}
	// Update and check bullets
	for (var b = bullets.length - 1; b >= 0; b--) {
		var bullet = bullets[b];
		// Remove bullets that go off screen
		if (bullet.lastY >= -25 && bullet.y < -25) {
			bullet.destroy();
			bullets.splice(b, 1);
			continue;
		}
		// Check bullet-enemy collisions
		var bulletHitEnemy = false;
		for (var e = enemies.length - 1; e >= 0; e--) {
			var enemy = enemies[e];
			if (bullet.intersects(enemy)) {
				// Enemy destroyed
				LK.setScore(LK.getScore() + 10);
				scoreTxt.setText('Score: ' + LK.getScore());
				// Create explosion effect
				tween(enemy, {
					scaleX: 2,
					scaleY: 2,
					alpha: 0
				}, {
					duration: 200,
					onFinish: function onFinish() {
						// Enemy cleanup is handled below
					}
				});
				LK.getSound('enemyDestroyed').play();
				// Remove enemy
				enemy.destroy();
				enemies.splice(e, 1);
				// Remove bullet
				bullet.destroy();
				bullets.splice(b, 1);
				bulletHitEnemy = true;
				break;
			}
		}
		if (!bulletHitEnemy) {
			bullet.lastY = bullet.y;
		}
	}
	// Update and check enemies
	for (var e = enemies.length - 1; e >= 0; e--) {
		var enemy = enemies[e];
		// Remove enemies that go off screen
		if (enemy.lastY <= 2732 + 50 && enemy.y > 2732 + 50) {
			enemy.destroy();
			enemies.splice(e, 1);
			continue;
		}
		// Check enemy-player collision
		var currentPlayerIntersecting = enemy.intersects(player);
		if (!enemy.lastPlayerIntersecting && currentPlayerIntersecting) {
			// Game Over
			LK.getSound('gameOver').play();
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
		enemy.lastY = enemy.y;
		enemy.lastPlayerIntersecting = currentPlayerIntersecting;
	}
	// Increase difficulty over time
	if (LK.getScore() > 0 && LK.getScore() % 100 === 0 && enemySpawnInterval > 20) {
		enemySpawnInterval = Math.max(20, enemySpawnInterval - 1);
	}
};