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

/**** 
* Classes
****/ 
// Enemy Car Class
var EnemyCar = Container.expand(function () {
	var self = Container.call(this);
	var car = self.attachAsset('enemyCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Lane index (0,1,2)
	self.lane = 1;
	// Speed in px per frame
	self.speed = 12;
	// Update method called by LK
	self.update = function () {
		self.y += self.speed * gameSpeed;
	};
	return self;
});
// Obstacle Class
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obs = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Lane index (0,1,2)
	self.lane = 1;
	// Speed in px per frame
	self.speed = 12;
	self.update = function () {
		self.y += self.speed * gameSpeed;
	};
	return self;
});
// Player Car Class
var PlayerCar = Container.expand(function () {
	var self = Container.call(this);
	var car = self.attachAsset('bmwCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Current lane index (0 = left, 1 = center, 2 = right)
	self.lane = 1;
	// Move to lane with animation and drifting effect
	self.moveToLane = function (laneIndex, duration) {
		self.lane = laneIndex;
		var targetX = getLaneX(laneIndex);
		// Determine drift direction
		var driftAngle = 0;
		if (laneIndex > self.lane) driftAngle = Math.PI / 10; // right drift
		else if (laneIndex < self.lane) driftAngle = -Math.PI / 10; // left drift
		// Animate drift: rotate, move, then straighten
		tween(self, {
			rotation: driftAngle,
			x: targetX
		}, {
			duration: (duration || 120) * 0.6,
			easing: tween.cubicOut,
			onComplete: function onComplete() {
				tween(self, {
					rotation: 0
				}, {
					duration: (duration || 120) * 0.4,
					easing: tween.cubicIn
				});
			}
		});
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222222
});

/**** 
* Game Code
****/ 
// BMW: white, slightly larger
// Obstacle: yellow ellipse (e.g. traffic cone)
// Enemy car: red box
// Player car: BMW (white box) with drifting animation
// Lane setup
var NUM_LANES = 3;
var laneWidth = 410; // 2048 / 5 = ~410, leaves margin on sides
var laneMargin = (2048 - NUM_LANES * laneWidth) / 2; // Center lanes
function getLaneX(laneIndex) {
	// Center of each lane
	return laneMargin + laneWidth * laneIndex + laneWidth / 2;
}
// Player car setup
var playerCar = new PlayerCar();
playerCar.x = getLaneX(1);
// Adjust y for larger BMW car
playerCar.y = 2732 - 420;
playerCar.lane = 1;
game.addChild(playerCar);
// Score display
var score = 0;
var scoreTxt = new Text2('Drift: 0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Game speed
var gameSpeed = 1.0;
var speedIncreaseInterval = 180; // every 3 seconds at 60fps
var speedIncreaseAmount = 0.08;
var maxGameSpeed = 2.8;
// Enemy/obstacle spawn
var enemyCars = [];
var obstacles = [];
var spawnTimer = 0;
var spawnInterval = 60; // frames between spawns (1 sec at 60fps), will decrease as speed increases
var minSpawnInterval = 24; // fastest spawn rate
// Touch/swipe handling
var dragStartX = null;
var dragStartY = null;
var dragActive = false;
var swipeThreshold = 80; // px
// Prevent input in top-left 100x100
function isInMenuArea(x, y) {
	return x < 100 && y < 100;
}
// Touch down
game.down = function (x, y, obj) {
	if (isInMenuArea(x, y)) return;
	dragStartX = x;
	dragStartY = y;
	dragActive = true;
};
// Touch up
game.up = function (x, y, obj) {
	dragStartX = null;
	dragStartY = null;
	dragActive = false;
};
// Touch move (swipe detection)
game.move = function (x, y, obj) {
	if (!dragActive || dragStartX === null) return;
	var dx = x - dragStartX;
	var dy = y - dragStartY;
	// Only consider horizontal swipes, ignore vertical
	if (Math.abs(dx) > Math.abs(dy) && Math.abs(dx) > swipeThreshold) {
		if (dx < 0 && playerCar.lane > 0) {
			// Swipe left
			playerCar.moveToLane(playerCar.lane - 1);
		} else if (dx > 0 && playerCar.lane < NUM_LANES - 1) {
			// Swipe right
			playerCar.moveToLane(playerCar.lane + 1);
		}
		dragActive = false; // Only one move per swipe
	}
};
// Helper: spawn enemy or obstacle
function spawnEnemyOrObstacle() {
	// Randomly decide: 70% enemy car, 30% obstacle
	var isEnemy = Math.random() < 0.7;
	var lane = Math.floor(Math.random() * NUM_LANES);
	if (isEnemy) {
		var enemy = new EnemyCar();
		enemy.lane = lane;
		enemy.x = getLaneX(lane);
		enemy.y = -200;
		enemyCars.push(enemy);
		game.addChild(enemy);
	} else {
		var obs = new Obstacle();
		obs.lane = lane;
		obs.x = getLaneX(lane);
		obs.y = -120;
		obstacles.push(obs);
		game.addChild(obs);
	}
}
// Main game update
game.update = function () {
	// Increase game speed over time
	if (LK.ticks % speedIncreaseInterval === 0 && gameSpeed < maxGameSpeed) {
		gameSpeed += speedIncreaseAmount;
		if (gameSpeed > maxGameSpeed) gameSpeed = maxGameSpeed;
		// Decrease spawn interval as speed increases
		spawnInterval = Math.max(minSpawnInterval, 60 - Math.floor((gameSpeed - 1) * 18));
	}
	// Spawn enemies/obstacles
	spawnTimer++;
	if (spawnTimer >= spawnInterval) {
		spawnEnemyOrObstacle();
		spawnTimer = 0;
	}
	// Update enemy cars
	for (var i = enemyCars.length - 1; i >= 0; i--) {
		var enemy = enemyCars[i];
		enemy.update();
		// Collision detection
		if (enemy.intersects(playerCar)) {
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
			return;
		}
		// Passed player (score)
		if (!enemy.passed && enemy.y > playerCar.y + 200) {
			enemy.passed = true;
			score++;
			scoreTxt.setText('Drift: ' + score);
		}
		// Remove off-screen
		if (enemy.y > 2900) {
			enemy.destroy();
			enemyCars.splice(i, 1);
		}
	}
	// Update obstacles
	for (var j = obstacles.length - 1; j >= 0; j--) {
		var obs = obstacles[j];
		obs.update();
		// Collision detection
		if (obs.intersects(playerCar)) {
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
			return;
		}
		// Passed player (score)
		if (!obs.passed && obs.y > playerCar.y + 200) {
			obs.passed = true;
			score++;
			scoreTxt.setText('Drift: ' + score);
		}
		// Remove off-screen
		if (obs.y > 2900) {
			obs.destroy();
			obstacles.splice(j, 1);
		}
	}
};
// Center score text horizontally
scoreTxt.setText('Drift: ' + score);
scoreTxt.anchor.set(0.5, 0);
// Play music (if any, not specified in MVP)