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

/**** 
* Classes
****/ 
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	// Attach bird asset (ellipse, yellow)
	var birdAsset = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set up physics
	self.vy = 0; // vertical speed
	self.gravity = 1.0; // gravity per frame (reduced for slower fall)
	self.flapStrength = -20; // negative for upward movement (reduced for slower jump)
	// Bird update: apply gravity, move, clamp position
	self.update = function () {
		self.vy += self.gravity;
		self.y += self.vy;
		// Clamp to top of screen
		if (self.y < self.height / 2) {
			self.y = self.height / 2;
			self.vy = 0;
		}
	};
	// Flap: set upward velocity
	self.flap = function () {
		self.vy = self.flapStrength;
	};
	return self;
});
// PipePair class (top and bottom pipes)
var PipePair = Container.expand(function () {
	var self = Container.call(this);
	// Pipe config
	self.pipeWidth = 220;
	self.gapHeight = 700;
	self.speed = 7;
	// Randomize gap position
	var minGapY = 350;
	var maxGapY = 2732 - 350 - self.gapHeight;
	var gapY = minGapY + Math.floor(Math.random() * (maxGapY - minGapY + 1));
	// Top pipe
	self.topPipe = self.attachAsset('pipe', {
		anchorX: 0,
		anchorY: 1,
		width: self.pipeWidth,
		height: gapY,
		y: gapY,
		x: 0,
		tint: 0x3bb44a
	});
	// Bottom pipe
	self.bottomPipe = self.attachAsset('pipe', {
		anchorX: 0,
		anchorY: 0,
		width: self.pipeWidth,
		height: 2732 - (gapY + self.gapHeight),
		y: gapY + self.gapHeight,
		x: 0,
		tint: 0x3bb44a
	});
	// Used for scoring
	self.passed = false;
	// Move pipes left
	self.update = function () {
		self.x -= self.speed;
	};
	// Helper: get bounding rectangles for collision
	self.getTopRect = function () {
		return new Rectangle(self.x, 0, self.pipeWidth, gapY);
	};
	self.getBottomRect = function () {
		return new Rectangle(self.x, gapY + self.gapHeight, self.pipeWidth, 2732 - (gapY + self.gapHeight));
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb // Sky blue
});

/**** 
* Game Code
****/ 
// --- Game Variables ---
// --- Asset Initialization ---
var bird;
var pipes = [];
var score = 0;
var scoreTxt;
var groundY = 2732 - 120; // ground is at bottom, bird is 120px tall
var pipeInterval = 120; // frames between pipes (slower pipe spawn)
var ticksSincePipe = 0;
var gameStarted = false;
var gameOver = false;
// --- Score Display ---
scoreTxt = new Text2('0', {
	size: 180,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// --- Bird ---
bird = new Bird();
game.addChild(bird);
bird.x = 2048 / 3;
bird.y = 2732 / 2;
// --- Game Start Helper ---
function startGame() {
	// Reset
	for (var i = 0; i < pipes.length; i++) {
		pipes[i].destroy();
	}
	pipes = [];
	score = 0;
	scoreTxt.setText(score);
	bird.x = 2048 / 3;
	bird.y = 2732 / 2;
	bird.vy = 0;
	ticksSincePipe = 0;
	gameStarted = true;
	gameOver = false;
}
// --- Input: Tap to Flap ---
game.down = function (x, y, obj) {
	if (!gameStarted) {
		startGame();
	}
	if (!gameOver) {
		bird.flap();
	}
};
// --- Main Update Loop ---
game.update = function () {
	if (!gameStarted || gameOver) {
		return;
	}
	// Bird physics
	bird.update();
	// Add new pipes
	ticksSincePipe++;
	if (ticksSincePipe >= pipeInterval) {
		ticksSincePipe = 0;
		var pipePair = new PipePair();
		pipePair.x = 2048;
		game.addChild(pipePair);
		pipes.push(pipePair);
	}
	// Update pipes, check for offscreen, collisions, scoring
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		pipe.update();
		// Remove pipes offscreen
		if (pipe.x + pipe.pipeWidth < 0) {
			pipe.destroy();
			pipes.splice(i, 1);
			continue;
		}
		// Collision detection (bird vs pipes)
		var birdRect = new Rectangle(bird.x - bird.width / 2 + 10, bird.y - bird.height / 2 + 10, bird.width - 20, bird.height - 20);
		var topRect = new Rectangle(pipe.x, 0, pipe.pipeWidth, pipe.topPipe.height);
		var bottomRect = new Rectangle(pipe.x, pipe.bottomPipe.y, pipe.pipeWidth, pipe.bottomPipe.height);
		if (rectsIntersect(birdRect, topRect) || rectsIntersect(birdRect, bottomRect)) {
			triggerGameOver();
			return;
		}
		// Scoring: passed pipe
		if (!pipe.passed && pipe.x + pipe.pipeWidth < bird.x) {
			pipe.passed = true;
			score++;
			scoreTxt.setText(score);
		}
	}
	// Collision with ground or ceiling
	if (bird.y + bird.height / 2 >= 2732) {
		bird.y = 2732 - bird.height / 2;
		triggerGameOver();
		return;
	}
	if (bird.y - bird.height / 2 <= 0) {
		bird.y = bird.height / 2;
		bird.vy = 0;
	}
};
// --- Rectangle Intersection Helper ---
function rectsIntersect(r1, r2) {
	return !(r2.x > r1.x + r1.width || r2.x + r2.width < r1.x || r2.y > r1.y + r1.height || r2.y + r2.height < r1.y);
}
// --- Game Over Handler ---
function triggerGameOver() {
	if (gameOver) return;
	gameOver = true;
	LK.effects.flashScreen(0xff0000, 600);
	LK.showGameOver();
}
// --- Initial State: Show bird, wait for tap ---
gameStarted = false;
gameOver = false;
score = 0;
scoreTxt.setText(score);