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

/**** 
* Classes
****/ 
var Dinosaur = Container.expand(function () {
	var self = Container.call(this);
	var dinoGraphics = self.attachAsset('dino', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.isJumping = false;
	self.jumpPower = 0;
	self.gravity = 1.2;
	self.groundY = 0;
	self.jump = function () {
		if (!self.isJumping) {
			self.isJumping = true;
			self.jumpPower = -28;
			LK.getSound('jump').play();
		}
	};
	self.update = function () {
		if (self.isJumping) {
			self.jumpPower += self.gravity;
			self.y += self.jumpPower;
			if (self.y >= self.groundY) {
				self.y = self.groundY;
				self.isJumping = false;
				self.jumpPower = 0;
			}
		}
	};
	return self;
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var cactusGraphics = self.attachAsset('cactus', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.speed = gameSpeed;
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
var gameSpeed = 8;
var obstacles = [];
var spawnTimer = 0;
var spawnInterval = 90;
var speedIncreaseTimer = 0;
var distanceScore = 0;
// Create ground
var ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 2600
}));
// Create dinosaur
var dinosaur = game.addChild(new Dinosaur());
dinosaur.x = 300;
dinosaur.y = 2600;
dinosaur.groundY = 2600;
// Create score display
var scoreTxt = new Text2('0', {
	size: 80,
	fill: 0x000000
});
scoreTxt.anchor.set(0, 0);
LK.gui.topLeft.addChild(scoreTxt);
scoreTxt.x = 120;
scoreTxt.y = 50;
// Touch controls
game.down = function (x, y, obj) {
	dinosaur.jump();
};
// Main game update
game.update = function () {
	// Update distance score
	distanceScore += 1;
	LK.setScore(Math.floor(distanceScore / 10));
	scoreTxt.setText('Score: ' + LK.getScore());
	// Increase game speed over time
	speedIncreaseTimer++;
	if (speedIncreaseTimer >= 300) {
		// Every 5 seconds
		gameSpeed += 0.5;
		speedIncreaseTimer = 0;
	}
	// Spawn obstacles
	spawnTimer++;
	if (spawnTimer >= spawnInterval) {
		var obstacle = new Obstacle();
		obstacle.x = 2200;
		obstacle.y = 2600;
		obstacle.speed = gameSpeed;
		obstacles.push(obstacle);
		game.addChild(obstacle);
		spawnTimer = 0;
		// Randomize next spawn interval
		spawnInterval = 60 + Math.random() * 80;
	}
	// Update and check obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obstacle = obstacles[i];
		// Track last position for collision detection
		if (obstacle.lastX === undefined) obstacle.lastX = obstacle.x;
		if (obstacle.lastColliding === undefined) obstacle.lastColliding = false;
		// Remove obstacles that are off screen
		if (obstacle.lastX >= -50 && obstacle.x < -50) {
			obstacle.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Check collision with dinosaur
		var currentColliding = obstacle.intersects(dinosaur);
		if (!obstacle.lastColliding && currentColliding) {
			// Collision detected - game over
			LK.getSound('hit').play();
			LK.effects.flashScreen(0xFF0000, 500);
			LK.showGameOver();
			return;
		}
		// Update last known states
		obstacle.lastX = obstacle.x;
		obstacle.lastColliding = currentColliding;
	}
};