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

/**** 
* Classes
****/ 
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.isDead = false;
	return self;
});
var Zombie = Container.expand(function () {
	var self = Container.call(this);
	var zombieGraphics = self.attachAsset('zombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.targetX = 0;
	self.targetY = 0;
	self.update = function () {
		if (player && !player.isDead) {
			// Calculate direction to player
			var dx = player.x - self.x;
			var dy = player.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				// Normalize and apply speed
				var normalizedX = dx / distance;
				var normalizedY = dy / distance;
				self.x += normalizedX * self.speed;
				self.y += normalizedY * self.speed;
			}
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2E7D32
});

/**** 
* Game Code
****/ 
// Game variables
var player;
var zombies = [];
var dragNode = null;
var gameTime = 0;
var spawnRate = 120; // Initial spawn rate (frames between spawns)
var minSpawnRate = 20;
var difficultyTimer = 0;
var lastScore = 0;
// UI Elements
var scoreTxt = new Text2('Score: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var timeTxt = new Text2('Time: 0s', {
	size: 60,
	fill: 0xFFFFFF
});
timeTxt.anchor.set(0, 0);
timeTxt.x = 120;
timeTxt.y = 120;
LK.gui.topLeft.addChild(timeTxt);
// Initialize player
player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 / 2;
// Spawn zombie function
function spawnZombie() {
	var zombie = new Zombie();
	var side = Math.floor(Math.random() * 4); // 0=top, 1=right, 2=bottom, 3=left
	switch (side) {
		case 0:
			// Top
			zombie.x = Math.random() * 2048;
			zombie.y = -30;
			break;
		case 1:
			// Right
			zombie.x = 2048 + 30;
			zombie.y = Math.random() * 2732;
			break;
		case 2:
			// Bottom
			zombie.x = Math.random() * 2048;
			zombie.y = 2732 + 30;
			break;
		case 3:
			// Left
			zombie.x = -30;
			zombie.y = Math.random() * 2732;
			break;
	}
	// Increase zombie speed based on time survived
	zombie.speed = 2 + gameTime / 3600; // Speed increases every minute
	if (zombie.speed > 6) zombie.speed = 6; // Cap maximum speed
	zombies.push(zombie);
	game.addChild(zombie);
}
// Movement handling
function handleMove(x, y, obj) {
	if (dragNode && !player.isDead) {
		var newX = x;
		var newY = y;
		// Keep player within screen bounds
		if (newX < 40) newX = 40;
		if (newX > 2048 - 40) newX = 2048 - 40;
		if (newY < 40) newY = 40;
		if (newY > 2732 - 40) newY = 2732 - 40;
		dragNode.x = newX;
		dragNode.y = newY;
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	if (!player.isDead) {
		dragNode = player;
		handleMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main game loop
game.update = function () {
	if (player.isDead) return;
	gameTime++;
	// Update time display every second (60 ticks)
	if (gameTime % 60 === 0) {
		var seconds = Math.floor(gameTime / 60);
		timeTxt.setText('Time: ' + seconds + 's');
		// Increase score every second
		LK.setScore(LK.getScore() + 1);
		scoreTxt.setText('Score: ' + LK.getScore());
	}
	// Increase difficulty over time
	difficultyTimer++;
	if (difficultyTimer % 600 === 0) {
		// Every 10 seconds
		if (spawnRate > minSpawnRate) {
			spawnRate -= 5; // Spawn zombies more frequently
		}
	}
	// Spawn zombies
	if (gameTime % spawnRate === 0) {
		spawnZombie();
	}
	// Check collisions between player and zombies
	for (var i = zombies.length - 1; i >= 0; i--) {
		var zombie = zombies[i];
		if (player.intersects(zombie)) {
			// Game Over
			player.isDead = true;
			// Visual feedback
			LK.effects.flashScreen(0xFF0000, 1000);
			// Play game over sound
			LK.getSound('gameOver').play();
			// Show game over after a brief delay
			LK.setTimeout(function () {
				LK.showGameOver();
			}, 500);
			return;
		}
		// Remove zombies that are too far off screen
		if (zombie.x < -200 || zombie.x > 2248 || zombie.y < -200 || zombie.y > 2932) {
			zombie.destroy();
			zombies.splice(i, 1);
		}
	}
};