/**** 
* 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.velocityY = 0;
	self.gravity = 0.6;
	self.flapPower = -15;
	self.isAlive = true;
	self.flap = function () {
		self.velocityY = self.flapPower;
		LK.getSound('flap').play();
	};
	self.update = function () {
		if (!self.isAlive) return;
		self.velocityY += self.gravity;
		self.y += self.velocityY;
		// Rotate bird based on velocity
		if (self.velocityY > 0) {
			birdGraphics.rotation = Math.min(self.velocityY * 0.05, 0.5);
		} else {
			birdGraphics.rotation = Math.max(self.velocityY * 0.05, -0.5);
		}
		// Ceiling collision
		if (self.y < 50) {
			self.y = 50;
			self.velocityY = 0;
			self.isAlive = false;
		}
		// Ground collision
		if (self.y > 2582) {
			self.y = 2582;
			self.velocityY = 0;
			self.isAlive = false;
		}
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.speed = -8;
	self.gapHeight = 300;
	self.minGapY = 200;
	self.maxGapY = 1800;
	self.scored = false;
	// Generate random gap position
	var gapY = Math.random() * (self.maxGapY - self.minGapY) + self.minGapY;
	// Top pipe
	var topPipe = self.attachAsset('pipeTop', {
		anchorX: 0.5,
		anchorY: 1
	});
	topPipe.x = 75;
	topPipe.y = gapY;
	// Bottom pipe
	var bottomPipe = self.attachAsset('pipeBottom', {
		anchorX: 0.5,
		anchorY: 0
	});
	bottomPipe.x = 75;
	bottomPipe.y = gapY + self.gapHeight;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var bird = game.addChild(new Bird());
bird.x = 300;
bird.y = 1366;
var pipes = [];
var score = 0;
var gameOver = false;
var pipeSpawnCounter = 0;
var pipeSpawnInterval = 120;
var scoreTxt = new Text2('0', {
	size: 150,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0.5,
	anchorY: 0.5
}));
ground.x = 1024;
ground.y = 2650;
// Game input handler
game.down = function (x, y, obj) {
	if (!gameOver && bird.isAlive) {
		bird.flap();
	}
};
game.update = function () {
	if (!gameOver) {
		bird.update();
		// Spawn pipes
		pipeSpawnCounter++;
		if (pipeSpawnCounter >= pipeSpawnInterval) {
			var newPipe = new Pipe();
			newPipe.x = 2200;
			newPipe.y = 0;
			pipes.push(newPipe);
			game.addChild(newPipe);
			pipeSpawnCounter = 0;
		}
		// Update and check pipes
		for (var i = pipes.length - 1; i >= 0; i--) {
			var pipe = pipes[i];
			pipe.update();
			// Remove off-screen pipes
			if (pipe.x < -200) {
				pipe.destroy();
				pipes.splice(i, 1);
				continue;
			}
			// Check collision with bird
			var topPipe = pipe.children[0];
			var bottomPipe = pipe.children[1];
			if (bird.intersects(topPipe) || bird.intersects(bottomPipe)) {
				if (bird.isAlive) {
					bird.isAlive = false;
					LK.getSound('hit').play();
					LK.effects.flashScreen(0xFF0000, 500);
					gameOver = true;
					LK.setTimeout(function () {
						LK.showGameOver();
					}, 600);
				}
			}
			// Award score when pipe is passed
			if (!pipe.scored && pipe.x < bird.x && pipe.x + 150 > bird.x - 40) {
				pipe.scored = true;
				score++;
				LK.setScore(score);
				scoreTxt.setText(score.toString());
				LK.getSound('score').play();
				// Win condition at score 50
				if (score >= 50) {
					gameOver = true;
					LK.setTimeout(function () {
						LK.showYouWin();
					}, 300);
				}
			}
		}
		// Ground collision
		if (bird.intersects(ground)) {
			if (bird.isAlive) {
				bird.isAlive = false;
				LK.getSound('hit').play();
				LK.effects.flashScreen(0xFF0000, 500);
				gameOver = true;
				LK.setTimeout(function () {
					LK.showGameOver();
				}, 600);
			}
		}
	}
};