/**** 
* Classes
****/
// RedEnemy class
var RedEnemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('redEnemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 20;
	self.move = function () {
		// Calculate direction towards player
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var len = Math.sqrt(dx * dx + dy * dy);
		dx /= len;
		dy /= len;
		// Move towards player
		self.x += dx * self.speed;
		self.y += dy * self.speed;
	};
});
// Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.move = function (x, y) {
		self.x = x;
		self.y = y;
	};
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.move = function () {
		self.y += self.speed;
	};
});
// Laser class
var Laser = Container.expand(function () {
	var self = Container.call(this);
	var laserGraphics = self.attachAsset('laser', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	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
****/
// Fire lasers when the game area is clicked
// Initialize player, enemy, and laser assets for the game.
var scoreTxt = new Text2('0', {
	size: 100,
	fill: '#ffffff'
});
LK.gui.topLeft.addChild(scoreTxt);
var score = 0;
game.on('down', function () {
	var laser = new Laser();
	laser.x = player.x;
	laser.y = player.y - 30; // Start slightly above the player
	lasers.push(laser);
	game.addChild(laser);
});
var player = game.addChild(new Player());
player.x = 1024; // Center horizontally
player.y = 2500; // Position towards the bottom
var enemies = [];
var lasers = [];
// Create enemies at intervals
var enemySpawnTimer = LK.setInterval(function () {
	// Randomly decide whether to create a normal enemy or a red enemy
	var isRed = Math.random() < 0.05;
	var enemy = isRed ? new RedEnemy() : new Enemy();
	enemy.x = Math.random() * 2048; // Random horizontal position
	enemy.y = 0; // Start at the top
	enemies.push(enemy);
	game.addChild(enemy);
}, 2000);
// Handle touch move to control player
game.on('move', function (obj) {
	var pos = obj.event.getLocalPosition(game);
	player.move(pos.x, pos.y);
});
// Main game loop
LK.on('tick', function () {
	// Move enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		enemies[i].move();
		// Remove enemies that go off screen or go too far to the left or right
		if (enemies[i].y > 2732 || enemies[i].x < 0 || enemies[i].x > 2048) {
			enemies[i].destroy();
			enemies.splice(i, 1);
		}
	}
	// Move lasers
	for (var j = lasers.length - 1; j >= 0; j--) {
		lasers[j].move();
		// Remove lasers that go off screen
		if (lasers[j].y < 0) {
			lasers[j].destroy();
			lasers.splice(j, 1);
		}
	}
	// Check for collisions between lasers and enemies
	for (var k = lasers.length - 1; k >= 0; k--) {
		for (var l = enemies.length - 1; l >= 0; l--) {
			if (lasers[k].intersects(enemies[l])) {
				// Destroy both laser and enemy on collision
				lasers[k].destroy();
				lasers.splice(k, 1);
				enemies[l].destroy();
				enemies.splice(l, 1);
				score += 1;
				scoreTxt.setText(score);
				break; // Exit the inner loop after a collision
			}
		}
	}
	// Check for collisions between player and enemies, and reset the game if a collision occurs
	for (var m = enemies.length - 1; m >= 0; m--) {
		if (player.intersects(enemies[m])) {
			LK.showGameOver('Your score: ' + LK.getScore());
		}
	}
});