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

/**** 
* Classes
****/ 
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	self.topPipe = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.bottomPipe = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -4;
	self.gapSize = 280;
	self.gapPosition = 0;
	self.scored = false;
	self.setGapPosition = function (gapPos) {
		self.gapPosition = gapPos;
		var topHeight = self.gapPosition;
		var bottomHeight = 2732 - self.gapPosition - self.gapSize;
		self.topPipe.y = topHeight / 2;
		self.topPipe.height = topHeight;
		self.bottomPipe.y = self.gapPosition + self.gapSize + bottomHeight / 2;
		self.bottomPipe.height = bottomHeight;
	};
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocityY = 0;
	self.gravity = 0.6;
	self.flapPower = -12;
	self.maxVelocity = 15;
	self.flap = function () {
		self.velocityY = self.flapPower;
		LK.getSound('flap').play();
	};
	self.update = function () {
		self.velocityY += self.gravity;
		if (self.velocityY > self.maxVelocity) {
			self.velocityY = self.maxVelocity;
		}
		self.y += self.velocityY;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var player = game.addChild(new Player());
player.x = 400;
player.y = 1366;
var obstacles = [];
var score = 0;
var gameActive = true;
var spawnTimer = 0;
var obstacleSpeed = -4;
var difficultyTimer = 0;
var minGapSize = 240;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0x000000
});
scoreTxt.anchor.set(0.5, 0);
scoreTxt.x = 1024;
scoreTxt.y = 100;
LK.gui.top.addChild(scoreTxt);
function updateScore() {
	scoreTxt.setText(score);
	LK.setScore(score);
}
function spawnObstacle() {
	var obstacle = game.addChild(new Obstacle());
	obstacle.x = 2200;
	obstacle.speed = obstacleSpeed;
	var minGap = Math.max(minGapSize, 240 - Math.floor(score / 10) * 10);
	var gapPos = Math.random() * (2732 - minGap - 200) + 100;
	obstacle.gapPosition = gapPos;
	obstacle.gapSize = minGap;
	obstacle.setGapPosition(gapPos);
	obstacles.push(obstacle);
}
function checkCollision(rect1X, rect1Y, rect1W, rect1H, rect2X, rect2Y, rect2W, rect2H) {
	return rect1X - rect1W / 2 < rect2X + rect2W / 2 && rect1X + rect1W / 2 > rect2X - rect2W / 2 && rect1Y - rect1H / 2 < rect2Y + rect2H / 2 && rect1Y + rect1H / 2 > rect2Y - rect2H / 2;
}
function endGame() {
	gameActive = false;
	LK.showGameOver();
}
game.down = function (x, y, obj) {
	if (gameActive) {
		player.flap();
	}
};
game.move = function (x, y, obj) {
	// Not used for this game
};
game.update = function () {
	if (!gameActive) {
		return;
	}
	// Update player
	player.update();
	// Check if player hit top or bottom
	if (player.y - 40 < 0 || player.y + 40 > 2732) {
		endGame();
		return;
	}
	// Spawn obstacles
	spawnTimer++;
	if (spawnTimer > 120) {
		spawnObstacle();
		spawnTimer = 0;
	}
	// Update obstacles and check collisions
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obstacle = obstacles[i];
		obstacle.update();
		// Check if obstacle is off screen
		if (obstacle.x + 100 < 0) {
			obstacle.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Check if player passed obstacle for scoring
		if (!obstacle.scored && obstacle.x + 75 < player.x) {
			obstacle.scored = true;
			score++;
			updateScore();
			LK.getSound('score').play();
		}
		// Check collision with top pipe
		var topPipeHeight = obstacle.gapPosition;
		if (checkCollision(player.x, player.y, 80, 80, obstacle.x, topPipeHeight / 2, 150, topPipeHeight)) {
			endGame();
			return;
		}
		// Check collision with bottom pipe
		var bottomPipeY = obstacle.gapPosition + obstacle.gapSize + (2732 - obstacle.gapPosition - obstacle.gapSize) / 2;
		var bottomPipeHeight = 2732 - obstacle.gapPosition - obstacle.gapSize;
		if (checkCollision(player.x, player.y, 80, 80, obstacle.x, bottomPipeY, 150, bottomPipeHeight)) {
			endGame();
			return;
		}
	}
	// Increase difficulty over time
	difficultyTimer++;
	if (difficultyTimer > 600) {
		if (obstacleSpeed > -6.5) {
			obstacleSpeed -= 0.3;
		}
		difficultyTimer = 0;
	}
};
// Start game music
LK.playMusic('bgmusic', {
	loop: true
});
updateScore();