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

/**** 
* Classes
****/ 
// Boost class
var Boost = Container.expand(function () {
	var self = Container.call(this);
	var boostAsset = self.attachAsset('boost', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = boostAsset.width;
	self.height = boostAsset.height;
	self.update = function () {
		self.y += roadSpeed;
	};
	return self;
});
// Car class
var Car = Container.expand(function () {
	var self = Container.call(this);
	var carAsset = self.attachAsset('car', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For collision, use the container itself
	self.width = carAsset.width;
	self.height = carAsset.height;
	// Car speed (pixels per tick)
	self.speed = 10;
	// Lateral speed (for smooth steering)
	self.lateralSpeed = 0;
	// Max lateral speed
	self.maxLateralSpeed = 32;
	// Steering target (x position)
	self.targetX = self.x;
	// Update method
	self.update = function () {
		// Smoothly move towards targetX
		var dx = self.targetX - self.x;
		if (Math.abs(dx) > 2) {
			self.lateralSpeed = Math.max(-self.maxLateralSpeed, Math.min(self.maxLateralSpeed, dx * 0.25));
			self.x += self.lateralSpeed;
		} else {
			self.lateralSpeed = 0;
			self.x = self.targetX;
		}
	};
	return self;
});
// Lane marker class
var Lane = Container.expand(function () {
	var self = Container.call(this);
	var laneAsset = self.attachAsset('lane', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = laneAsset.width;
	self.height = laneAsset.height;
	self.update = function () {
		self.y += roadSpeed;
	};
	return self;
});
// Obstacle class
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obsAsset = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = obsAsset.width;
	self.height = obsAsset.height;
	// Update method: move down by road speed
	self.update = function () {
		// Track lastY for scoring
		if (self.lastY === undefined) self.lastY = self.y;
		self.y += roadSpeed;
		// No score for passing obstacles; scoring is handled by collecting boosts.
		self.lastY = self.y;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Game constants
// Car (player)
// Obstacle
// Speed boost
// Road
// Lane marker
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var ROAD_WIDTH = 900;
var ROAD_X = (GAME_WIDTH - ROAD_WIDTH) / 2;
var ROAD_Y = 0;
var LANE_COUNT = 3;
var LANE_WIDTH = ROAD_WIDTH / LANE_COUNT;
var CAR_START_X = GAME_WIDTH / 2;
var CAR_START_Y = GAME_HEIGHT - 500;
var OBSTACLE_MIN_GAP = 600;
var OBSTACLE_MAX_GAP = 1100;
var BOOST_CHANCE = 0.25; // 25% chance to spawn a boost with an obstacle
// Road speed (pixels per tick)
var roadSpeed = 10;
var roadSpeedBase = 10;
var roadSpeedBoosted = 24;
var boostDuration = 90; // ticks (1.5 seconds)
var boostTicks = 0;
// Score
var score = 0;
// Arrays for game objects
var obstacles = [];
var boosts = [];
var lanes = [];
// Road background
var road = LK.getAsset('road', {
	anchorX: 0,
	anchorY: 0,
	x: ROAD_X,
	y: ROAD_Y
});
game.addChild(road);
// Lane markers
function spawnLaneMarkers() {
	// Remove old lanes
	for (var i = 0; i < lanes.length; i++) {
		lanes[i].destroy();
	}
	lanes = [];
	// For each lane (except the leftmost), draw a marker
	for (var l = 1; l < LANE_COUNT; l++) {
		for (var y = -200; y < GAME_HEIGHT + 200; y += 400) {
			var lane = new Lane();
			lane.x = ROAD_X + l * LANE_WIDTH;
			lane.y = y;
			lanes.push(lane);
			game.addChild(lane);
		}
	}
}
spawnLaneMarkers();
// Car (player)
var car = new Car();
car.x = CAR_START_X;
car.y = CAR_START_Y;
car.targetX = car.x;
game.addChild(car);
// Score text
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Helper: get lane center x
function getLaneCenter(laneIdx) {
	return ROAD_X + LANE_WIDTH * (laneIdx + 0.5);
}
// Helper: spawn an obstacle (and maybe a boost)
function spawnObstacle() {
	// Random lane
	var laneIdx = Math.floor(Math.random() * LANE_COUNT);
	var obs = new Obstacle();
	obs.x = getLaneCenter(laneIdx);
	obs.y = -obs.height / 2;
	obstacles.push(obs);
	game.addChild(obs);
	// Maybe spawn a boost in a different lane
	if (Math.random() < BOOST_CHANCE) {
		var boostLane = laneIdx;
		// Try to pick a different lane
		if (LANE_COUNT > 1) {
			while (boostLane === laneIdx) {
				boostLane = Math.floor(Math.random() * LANE_COUNT);
			}
		}
		var boost = new Boost();
		boost.x = getLaneCenter(boostLane);
		boost.y = obs.y;
		boosts.push(boost);
		game.addChild(boost);
	}
}
// Helper: spawn lane markers as they scroll
function updateLaneMarkers() {
	for (var i = lanes.length - 1; i >= 0; i--) {
		var lane = lanes[i];
		lane.update();
		if (lane.y > GAME_HEIGHT + 200) {
			// Recycle to top
			lane.y -= GAME_HEIGHT + 400;
		}
	}
}
// Dragging
var dragging = false;
var dragOffsetX = 0;
// Touch/mouse controls
game.down = function (x, y, obj) {
	// Only allow drag if touch is on car or on road
	if (x > ROAD_X && x < ROAD_X + ROAD_WIDTH && y > 0 && y < GAME_HEIGHT) {
		dragging = true;
		dragOffsetX = x - car.x;
		// Set targetX immediately
		car.targetX = Math.max(ROAD_X + car.width / 2, Math.min(ROAD_X + ROAD_WIDTH - car.width / 2, x - dragOffsetX));
	}
};
game.up = function (x, y, obj) {
	dragging = false;
};
game.move = function (x, y, obj) {
	if (dragging) {
		// Clamp to road
		var tx = Math.max(ROAD_X + car.width / 2, Math.min(ROAD_X + ROAD_WIDTH - car.width / 2, x - dragOffsetX));
		car.targetX = tx;
	}
};
// Game update
var lastObstacleY = -OBSTACLE_MIN_GAP;
game.update = function () {
	// Update car
	car.update();
	// Update lane markers
	updateLaneMarkers();
	// Update obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.update();
		// Remove if off screen
		if (obs.y - obs.height / 2 > GAME_HEIGHT + 100) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision with car
		if (car.intersects(obs)) {
			// Flash screen red, game over
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
			return;
		}
	}
	// Update boosts
	for (var i = boosts.length - 1; i >= 0; i--) {
		var boost = boosts[i];
		boost.update();
		// Remove if off screen
		if (boost.y - boost.height / 2 > GAME_HEIGHT + 100) {
			boost.destroy();
			boosts.splice(i, 1);
			continue;
		}
		// Collect boost
		if (car.intersects(boost)) {
			boost.destroy();
			boosts.splice(i, 1);
			// Add score for collecting boost
			score += 100;
			scoreTxt.setText(score);
			// Flash car yellow
			LK.effects.flashObject(car, 0xffeb3b, 400);
		}
	}
	// Handle boost timer
	if (boostTicks > 0) {
		boostTicks--;
		if (boostTicks === 0) {
			roadSpeed = roadSpeedBase;
		}
	}
	// Spawn new obstacles
	if (obstacles.length === 0 || obstacles[obstacles.length - 1].y > OBSTACLE_MIN_GAP + Math.random() * (OBSTACLE_MAX_GAP - OBSTACLE_MIN_GAP)) {
		spawnObstacle();
	}
	// Score is only updated by collecting boosts.
	// Check if car is off the road
	if (car.x - car.width / 2 < ROAD_X || car.x + car.width / 2 > ROAD_X + ROAD_WIDTH) {
		LK.effects.flashScreen(0xff0000, 800);
		LK.showGameOver();
		return;
	}
};
// Reset game state on new game
LK.on('gameStart', function () {
	// Remove all obstacles and boosts
	for (var i = 0; i < obstacles.length; i++) obstacles[i].destroy();
	for (var i = 0; i < boosts.length; i++) boosts[i].destroy();
	obstacles = [];
	boosts = [];
	// Reset car position
	car.x = CAR_START_X;
	car.y = CAR_START_Y;
	car.targetX = car.x;
	// Reset score and speed
	score = 0;
	scoreTxt.setText(score);
	roadSpeed = roadSpeedBase;
	boostTicks = 0;
	// Reset lane markers
	spawnLaneMarkers();
});