/**** 
* 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.flapStrength = -12;
	self.maxFallSpeed = 15;
	self.rotation = 0;
	self.flap = function () {
		self.velocity = self.flapStrength;
		LK.getSound('flap').play();
		// Animate bird flap
		tween(birdGraphics, {
			rotation: -0.3
		}, {
			duration: 150
		});
		tween(birdGraphics, {
			rotation: 0
		}, {
			duration: 150,
			onFinish: function onFinish() {
				if (self.velocity > 0) {
					tween(birdGraphics, {
						rotation: 0.3
					}, {
						duration: 200
					});
				}
			}
		});
	};
	self.update = function () {
		// Apply gravity
		self.velocity += self.gravity;
		if (self.velocity > self.maxFallSpeed) {
			self.velocity = self.maxFallSpeed;
		}
		// Update position
		self.y += self.velocity;
		// Update rotation based on velocity with falling effect
		var targetRotation = Math.min(Math.max(self.velocity * 0.05, -0.5), 0.8);
		// Add dramatic falling effect when bird is falling fast
		if (self.velocity > 8) {
			// Create falling spin effect
			tween(birdGraphics, {
				rotation: targetRotation + Math.PI * 2
			}, {
				duration: 800,
				easing: tween.easeIn
			});
			// Add slight scale effect during fall
			tween(birdGraphics, {
				scaleX: 0.9,
				scaleY: 1.1
			}, {
				duration: 300,
				easing: tween.easeOut,
				onFinish: function onFinish() {
					tween(birdGraphics, {
						scaleX: 1,
						scaleY: 1
					}, {
						duration: 200
					});
				}
			});
		} else {
			// Normal rotation for regular movement
			birdGraphics.rotation = targetRotation;
		}
	};
	return self;
});
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -4;
	self.collected = false;
	self.rotationSpeed = 0.1;
	self.update = function () {
		self.x += self.speed;
		// Rotate coin for visual appeal
		coinGraphics.rotation += self.rotationSpeed;
		// Gentle floating animation
		coinGraphics.y = Math.sin(LK.ticks * 0.05) * 3;
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.speed = -4;
	self.passed = false;
	self.gapSize = 300;
	// Create top pipe
	self.topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Create top pipe segment (Mario-style cap)
	self.topPipeSegment = self.attachAsset('pipeSegment', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Create bottom pipe
	self.bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0
	});
	// Create bottom pipe segment (Mario-style cap)
	self.bottomPipeSegment = self.attachAsset('pipeSegment', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.setGapPosition = function (gapY) {
		self.topPipe.y = gapY - self.gapSize / 2;
		self.bottomPipe.y = gapY + self.gapSize / 2;
		// Position the Mario-style pipe segments
		self.topPipeSegment.y = gapY - self.gapSize / 2;
		self.bottomPipeSegment.y = gapY + self.gapSize / 2;
	};
	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 ground;
var gameStarted = false;
var gameSpeed = 4;
var pipeSpawnTimer = 0;
var pipeSpawnInterval = 180; // frames between pipe spawns
var lastPipeScore = 0;
var coins = [];
var coinSpawnTimer = 0;
var coinSpawnInterval = 200; // frames between coin spawns - slightly after pipes
// UI elements
var scoreTxt = new Text2('0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var instructionTxt = new Text2('Tap to Flap!', {
	size: 60,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0.5);
LK.gui.center.addChild(instructionTxt);
// Create bird
bird = game.addChild(new Bird());
bird.x = 400;
bird.y = 1366; // Center of screen height
// Create ground
ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0
}));
ground.x = 0;
ground.y = 2732 - 100; // Bottom of screen
// Game state tracking
var lastBirdY = bird.y;
var lastGroundCollision = false;
var lastCeilingCollision = false;
function spawnPipe() {
	var pipe = new Pipe();
	pipe.x = 2048 + 60; // Start off-screen right
	// Random gap position (avoiding too high or too low)
	var minGapY = 300;
	var maxGapY = ground.y - 300;
	var gapY = minGapY + Math.random() * (maxGapY - minGapY);
	pipe.setGapPosition(gapY);
	pipe.speed = -gameSpeed;
	pipes.push(pipe);
	game.addChild(pipe);
}
function spawnCoin() {
	// Only spawn coin if there's a recent pipe to place it with
	if (pipes.length > 0) {
		var latestPipe = pipes[pipes.length - 1];
		var coin = new Coin();
		// Place coin slightly ahead of the pipe gap
		coin.x = latestPipe.x + 150; // Position coin in the gap area
		// Place coin in the center of the pipe gap
		var gapCenterY = (latestPipe.topPipe.y + latestPipe.bottomPipe.y) / 2;
		coin.y = gapCenterY;
		coin.speed = -gameSpeed;
		coins.push(coin);
		game.addChild(coin);
	}
}
function checkCollisions() {
	// Check ground collision
	var currentGroundCollision = bird.y + 22 >= ground.y; // bird half-height
	if (!lastGroundCollision && currentGroundCollision) {
		LK.getSound('hit').play();
		LK.showGameOver();
		return;
	}
	lastGroundCollision = currentGroundCollision;
	// Check ceiling collision
	var currentCeilingCollision = bird.y - 22 <= 0;
	if (!lastCeilingCollision && currentCeilingCollision) {
		LK.getSound('hit').play();
		LK.showGameOver();
		return;
	}
	lastCeilingCollision = currentCeilingCollision;
	// Check pipe collisions and scoring
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		// Check if bird passed through pipe (scoring)
		if (!pipe.passed && bird.x > pipe.x + 60) {
			pipe.passed = true;
			// No score change when passing through pipes
			LK.getSound('score').play();
			// Increase difficulty every 5 pipes
			if (LK.getScore() % 5 === 0) {
				gameSpeed += 0.5;
			}
		}
		// Check collision with pipes
		var birdLeft = bird.x - 30;
		var birdRight = bird.x + 30;
		var birdTop = bird.y - 22;
		var birdBottom = bird.y + 22;
		var pipeLeft = pipe.x - 60;
		var pipeRight = pipe.x + 60;
		if (birdRight > pipeLeft && birdLeft < pipeRight) {
			// Bird is horizontally aligned with pipe
			var topPipeBottom = pipe.topPipe.y;
			var bottomPipeTop = pipe.bottomPipe.y;
			if (birdTop < topPipeBottom || birdBottom > bottomPipeTop) {
				// Collision with pipe
				LK.getSound('hit').play();
				LK.showGameOver();
				return;
			}
		}
	}
	// Check coin collection
	for (var j = coins.length - 1; j >= 0; j--) {
		var coin = coins[j];
		if (!coin.collected && bird.intersects(coin)) {
			coin.collected = true;
			LK.setScore(LK.getScore() + 1); // Coins worth 1 point
			scoreTxt.setText(LK.getScore());
			LK.getSound('coin').play();
			// Visual effect - make coin disappear with scaling
			tween(coin, {
				scaleX: 0,
				scaleY: 0,
				alpha: 0
			}, {
				duration: 200,
				onFinish: function onFinish() {
					coin.destroy();
				}
			});
			coins.splice(j, 1);
		}
	}
}
// Touch controls
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
		instructionTxt.alpha = 0;
	}
	bird.flap();
};
// Main game loop
game.update = function () {
	if (!gameStarted) {
		return;
	}
	// Update bird
	lastBirdY = bird.y;
	// Spawn pipes
	pipeSpawnTimer++;
	if (pipeSpawnTimer >= pipeSpawnInterval) {
		spawnPipe();
		pipeSpawnTimer = 0;
	}
	// Spawn coins - spawn a coin shortly after each pipe
	coinSpawnTimer++;
	if (coinSpawnTimer >= coinSpawnInterval) {
		spawnCoin();
		coinSpawnTimer = 0;
	}
	// Update pipes and remove off-screen ones
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		pipe.speed = -gameSpeed;
		if (pipe.x < -120) {
			pipe.destroy();
			pipes.splice(i, 1);
		}
	}
	// Update coins and remove off-screen ones
	for (var j = coins.length - 1; j >= 0; j--) {
		var coin = coins[j];
		coin.speed = -gameSpeed;
		if (coin.x < -40) {
			coin.destroy();
			coins.splice(j, 1);
		}
	}
	// Check all collisions
	checkCollisions();
};