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

/**** 
* Classes
****/ 
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGfx = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -48; // Fast upward
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Crosshair class (visual only)
var Crosshair = Container.expand(function () {
	var self = Container.call(this);
	var crossGfx = self.attachAsset('crosshair', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	crossGfx.alpha = 0.4;
	return self;
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGfx = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 6 + Math.random() * 6; // Varying speed
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x181818
});

/**** 
* Game Code
****/ 
// Music (optional, will not play by default)
// Sound for enemy escape
// Sound for enemy hit
// Sound for shooting
// Crosshair: Green ellipse, thin
// Bullet: Yellow box, small
// Enemy: Red ellipse, medium size
// Game variables
var bullets = [];
var enemies = [];
var crosshair = null;
var score = 0;
var missed = 0;
var maxMissed = 5;
var spawnInterval = 60; // frames between spawns, will decrease
var lastSpawnTick = 0;
var dragAiming = false;
// Score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Missed display (bottom center)
var missedTxt = new Text2('', {
	size: 90,
	fill: 0xFF4444
});
missedTxt.anchor.set(0.5, 1);
LK.gui.bottom.addChild(missedTxt);
// Crosshair
crosshair = new Crosshair();
game.addChild(crosshair);
crosshair.x = 2048 / 2;
crosshair.y = 2732 * 0.8;
// Helper: update UI
function updateUI() {
	scoreTxt.setText(score);
	missedTxt.setText(missed > 0 ? "Missed: " + missed + "/" + maxMissed : "");
}
// Helper: spawn enemy at random x
function spawnEnemy() {
	var enemy = new Enemy();
	var margin = 120;
	enemy.x = margin + Math.random() * (2048 - 2 * margin);
	enemy.y = -80;
	enemies.push(enemy);
	game.addChild(enemy);
}
// Helper: fire bullet from crosshair
function fireBullet(x, y) {
	var bullet = new Bullet();
	bullet.x = x;
	bullet.y = y;
	bullets.push(bullet);
	game.addChild(bullet);
	LK.getSound('shoot').play();
}
// Touch controls
game.down = function (x, y, obj) {
	// Move crosshair to touch, fire
	crosshair.x = x;
	crosshair.y = y;
	fireBullet(x, y);
	dragAiming = true;
};
game.move = function (x, y, obj) {
	if (dragAiming) {
		crosshair.x = x;
		crosshair.y = y;
	}
};
game.up = function (x, y, obj) {
	dragAiming = false;
};
// Main update loop
game.update = function () {
	// Spawn enemies
	if (LK.ticks - lastSpawnTick >= spawnInterval) {
		spawnEnemy();
		lastSpawnTick = LK.ticks;
		// Increase difficulty
		if (spawnInterval > 24) {
			spawnInterval -= 1;
		}
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var b = bullets[i];
		b.update();
		// Remove if off screen
		if (b.y < -100) {
			b.destroy();
			bullets.splice(i, 1);
			continue;
		}
	}
	// Update enemies
	for (var j = enemies.length - 1; j >= 0; j--) {
		var e = enemies[j];
		e.update();
		// Check if enemy reached bottom
		if (e.y > 2732 + 100) {
			e.destroy();
			enemies.splice(j, 1);
			missed += 1;
			updateUI();
			LK.getSound('fail').play();
			// Game over if too many missed
			if (missed >= maxMissed) {
				LK.effects.flashScreen(0xff0000, 800);
				LK.showGameOver();
				return;
			}
			continue;
		}
		// Check collision with bullets
		var hit = false;
		for (var k = bullets.length - 1; k >= 0; k--) {
			var b2 = bullets[k];
			if (e.intersects(b2)) {
				// Hit!
				hit = true;
				score += 1;
				updateUI();
				LK.getSound('hit').play();
				// Remove both
				e.destroy();
				b2.destroy();
				enemies.splice(j, 1);
				bullets.splice(k, 1);
				// Win condition
				if (score >= 30) {
					LK.effects.flashScreen(0x44ff44, 800);
					LK.showYouWin();
					return;
				}
				break;
			}
		}
		if (hit) continue;
	}
};
// Initial UI
updateUI();