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

/**** 
* Classes
****/ 
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	// Attach a yellow ellipse as the bird
	var birdAsset = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Bird physics
	self.velocity = 0; // vertical speed
	self.gravity = 0.7; // gravity per frame (reduced for slower fall)
	self.flapStrength = -22; // negative for upward movement
	// Bird size for collision
	self.radius = birdAsset.width * 0.45;
	// Flap method
	self.flap = function () {
		self.velocity = self.flapStrength;
	};
	// Update method (called every tick)
	self.update = function () {
		self.velocity += self.gravity;
		self.y += self.velocity;
		// Clamp rotation for visual feedback (optional)
		var maxAngle = Math.PI / 4;
		var minAngle = -Math.PI / 3;
		var angle = self.velocity / 30 * maxAngle;
		if (angle > maxAngle) angle = maxAngle;
		if (angle < minAngle) angle = minAngle;
		birdAsset.rotation = angle;
	};
	return self;
});
// PipePair class (top and bottom pipes as a pair)
var PipePair = Container.expand(function () {
	var self = Container.call(this);
	// Pipe dimensions
	var pipeWidth = 220;
	var gapHeight = 800; // vertical gap between pipes (increased gap)
	// Randomize gap position
	var minY = 400;
	var maxY = 2732 - 400 - gapHeight;
	var gapY = minY + Math.floor(Math.random() * (maxY - minY + 1));
	// Top pipe
	var topPipe = self.attachAsset('pipe', {
		width: pipeWidth,
		height: gapY,
		color: 0x4ec04e,
		shape: 'box',
		anchorX: 0,
		anchorY: 1,
		x: 0,
		y: gapY
	});
	// Bottom pipe
	var bottomPipe = self.attachAsset('pipe', {
		width: pipeWidth,
		height: 2732 - (gapY + gapHeight),
		color: 0x4ec04e,
		shape: 'box',
		anchorX: 0,
		anchorY: 0,
		x: 0,
		y: gapY + gapHeight
	});
	// For scoring: has the bird passed this pipe?
	self.passed = false;
	// Move pipes leftward
	self.speed = 14;
	self.update = function () {
		self.x -= self.speed;
	};
	// For collision detection, expose gapY and gapHeight
	self.gapY = gapY;
	self.gapHeight = gapHeight;
	self.pipeWidth = pipeWidth;
	return self;
});

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

/**** 
* Game Code
****/ 
// Tween plugin for smooth animations (optional, but included for future polish)
// --- Game constants ---
var BIRD_START_X = 600;
var BIRD_START_Y = 1366;
var PIPE_INTERVAL = 90; // frames between pipes
var GROUND_HEIGHT = 180;
// --- Game state ---
var bird;
var pipes = [];
var score = 0;
var scoreTxt;
var gameStarted = false;
var gameOver = false;
var lastPipeTick = 0;
// --- Asset initialization (shapes) ---
// --- Add ground (for collision) ---
var ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 2732 - GROUND_HEIGHT
});
game.addChild(ground);
// --- Add bird ---
bird = new Bird();
bird.x = BIRD_START_X;
bird.y = BIRD_START_Y;
game.addChild(bird);
// --- Score display ---
scoreTxt = new Text2('0', {
	size: 180,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// --- Start instructions (centered) ---
var startTxt = new Text2('Tap to Flap!', {
	size: 120,
	fill: 0xFFFFFF
});
startTxt.anchor.set(0.5, 0.5);
LK.gui.center.addChild(startTxt);
// --- Helper: Reset game state ---
function resetGame() {
	// Remove pipes
	for (var i = 0; i < pipes.length; i++) {
		pipes[i].destroy();
	}
	pipes = [];
	// Reset bird
	bird.x = BIRD_START_X;
	bird.y = BIRD_START_Y;
	bird.velocity = 0;
	// Reset score
	score = 0;
	scoreTxt.setText('0');
	// Reset state
	gameStarted = false;
	gameOver = false;
	lastPipeTick = LK.ticks;
	// Show start text
	startTxt.visible = true;
}
// --- Helper: Check collision between bird and pipes/ground ---
function checkCollision() {
	// Bird with ground
	if (bird.y + bird.radius >= 2732 - GROUND_HEIGHT) {
		// Clamp the bird to the ground so it can't pass through visually
		bird.y = 2732 - GROUND_HEIGHT - bird.radius;
		return true;
	}
	// Bird with ceiling
	if (bird.y - bird.radius <= 0) {
		return true;
	}
	// Bird with pipes
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		// Pipe bounds
		var px = pipe.x;
		var pw = pipe.pipeWidth;
		var gapY = pipe.gapY;
		var gapH = pipe.gapHeight;
		// Bird's bounding box
		var bx = bird.x;
		var by = bird.y;
		var br = bird.radius;
		// Check horizontal overlap
		if (bx + br > px && bx - br < px + pw) {
			// Check if bird is NOT in the gap
			if (by - br < gapY || by + br > gapY + gapH) {
				return true;
			}
		}
	}
	return false;
}
// --- Helper: Update score if bird passes pipes ---
function updateScore() {
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		if (!pipe.passed && bird.x > pipe.x + pipe.pipeWidth) {
			pipe.passed = true;
			score += 1;
			scoreTxt.setText(score + '');
		}
	}
}
// --- Game tap/flap handler ---
function onFlap() {
	if (gameOver) return;
	if (!gameStarted) {
		gameStarted = true;
		startTxt.visible = false;
	}
	bird.flap();
}
// --- Touch/click events ---
game.down = function (x, y, obj) {
	onFlap();
};
// --- Main game loop ---
game.update = function () {
	if (gameOver) return;
	// Only update bird and pipes if game started
	if (gameStarted) {
		bird.update();
		// Add new pipes at intervals
		if (LK.ticks - lastPipeTick >= PIPE_INTERVAL) {
			var pipe = new PipePair();
			pipe.x = 2048;
			game.addChild(pipe);
			pipes.push(pipe);
			lastPipeTick = LK.ticks;
		}
		// Update pipes and remove off-screen ones
		for (var i = pipes.length - 1; i >= 0; i--) {
			var pipe = pipes[i];
			pipe.update();
			if (pipe.x + pipe.pipeWidth < 0) {
				pipe.destroy();
				pipes.splice(i, 1);
			}
		}
		// Update score
		updateScore();
		// Check for collision
		if (checkCollision()) {
			gameOver = true;
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
		}
	}
};
// --- Reset game on game over (handled by LK) ---
LK.on('gameover', function () {
	resetGame();
});
// --- Initial reset ---
resetGame();