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

/**** 
* Classes
****/ 
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocity = 0;
	self.gravity = 0.8;
	self.flapPower = -12;
	self.isAlive = true;
	self.flap = function () {
		if (self.isAlive) {
			self.velocity = self.flapPower;
			LK.getSound('flap').play();
			// Visual flap animation
			tween(birdGraphics, {
				rotation: -0.3
			}, {
				duration: 100
			});
			tween(birdGraphics, {
				rotation: 0
			}, {
				duration: 200
			});
		}
	};
	self.update = function () {
		if (self.isAlive) {
			self.velocity += self.gravity;
			self.y += self.velocity;
			// Rotate bird based on velocity
			birdGraphics.rotation = Math.max(-0.5, Math.min(0.5, self.velocity * 0.05));
			// Check bounds
			if (self.y < 0 || self.y > 2732) {
				self.die();
			}
		}
	};
	self.die = function () {
		self.isAlive = false;
		LK.effects.flashScreen(0xFF0000, 1000);
		LK.setTimeout(function () {
			LK.showGameOver();
		}, 500);
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	var pipeGraphics = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -4;
	self.touched = false;
	self.scored = false;
	self.lastTouching = false;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Game variables
var bird;
var pipes = [];
var pipeSpawnTimer = 0;
var pipeSpawnInterval = 120; // 2 seconds at 60fps
var gameStarted = false;
// UI
var scoreTxt = new Text2('0', {
	size: 100,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var instructionTxt = new Text2('TAP TO FLY\nTOUCH PIPES TO SURVIVE', {
	size: 60,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0.5);
instructionTxt.x = 2048 / 2;
instructionTxt.y = 2732 / 2 - 200;
game.addChild(instructionTxt);
// Initialize bird
bird = game.addChild(new Bird());
bird.x = 400;
bird.y = 2732 / 2;
// Input handling
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
		instructionTxt.visible = false;
		LK.playMusic('bgmusic');
	}
	if (bird.isAlive) {
		bird.flap();
	}
};
// Spawn pipe function
function spawnPipe() {
	var pipe = new Pipe();
	pipe.x = 2048 + 40; // Start off-screen
	pipe.y = Math.random() * (2732 - 400) + 200; // Random height with margins
	pipes.push(pipe);
	game.addChild(pipe);
}
// Main game update
game.update = function () {
	if (!gameStarted) return;
	// Update bird
	if (bird.isAlive) {
		// Spawn pipes
		pipeSpawnTimer++;
		if (pipeSpawnTimer >= pipeSpawnInterval) {
			spawnPipe();
			pipeSpawnTimer = 0;
			// Gradually increase difficulty
			if (pipeSpawnInterval > 80) {
				pipeSpawnInterval -= 0.5;
			}
		}
		// Update and check pipes
		for (var i = pipes.length - 1; i >= 0; i--) {
			var pipe = pipes[i];
			// Remove off-screen pipes
			if (pipe.x < -100) {
				pipe.destroy();
				pipes.splice(i, 1);
				continue;
			}
			// Check if bird is touching pipe
			var currentTouching = bird.intersects(pipe);
			// If bird just started touching this pipe (deadly collision)
			if (!pipe.lastTouching && currentTouching && !pipe.touched) {
				pipe.touched = true;
				LK.getSound('touch').play();
				// Visual feedback
				LK.effects.flashObject(pipe, 0xFF0000, 300);
				// Bird dies when touching pipe
				bird.die();
			}
			pipe.lastTouching = currentTouching;
		}
		// Check if bird successfully avoided pipes (score condition)
		for (var j = 0; j < pipes.length; j++) {
			var checkPipe = pipes[j];
			// If pipe has moved past the bird and wasn't touched, increase score
			if (checkPipe.x < bird.x - 100 && !checkPipe.touched && !checkPipe.scored) {
				checkPipe.scored = true;
				LK.setScore(LK.getScore() + 1);
				scoreTxt.setText(LK.getScore());
				// Visual feedback for successful avoidance
				LK.effects.flashObject(checkPipe, 0x00FF00, 300);
			}
		}
	}
};