/**** 
* 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.maxFallSpeed = 15;
	self.maxRiseSpeed = -15;
	self.flap = function () {
		self.velocity = self.flapPower;
		LK.getSound('flap').play();
		// Rotate bird upward when flapping
		tween(birdGraphics, {
			rotation: -0.5
		}, {
			duration: 200
		});
	};
	self.update = function () {
		// Apply gravity
		self.velocity += self.gravity;
		// Limit velocity
		if (self.velocity > self.maxFallSpeed) {
			self.velocity = self.maxFallSpeed;
		}
		if (self.velocity < self.maxRiseSpeed) {
			self.velocity = self.maxRiseSpeed;
		}
		// Update position
		self.y += self.velocity;
		// Rotate bird based on velocity
		var targetRotation = self.velocity * 0.1;
		if (targetRotation > 1.5) targetRotation = 1.5;
		if (targetRotation < -0.5) targetRotation = -0.5;
		tween(birdGraphics, {
			rotation: targetRotation
		}, {
			duration: 100
		});
	};
	return self;
});
var Particle = Container.expand(function (x, y, color) {
	var self = Container.call(this);
	var particle = self.attachAsset('speedPowerUp', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	particle.tint = color;
	particle.scaleX = 0.3;
	particle.scaleY = 0.3;
	self.x = x;
	self.y = y;
	self.velocityX = (Math.random() - 0.5) * 8;
	self.velocityY = (Math.random() - 0.5) * 8;
	self.life = 60; // 1 second at 60fps
	self.update = function () {
		self.x += self.velocityX;
		self.y += self.velocityY;
		self.life--;
		// Fade out over time
		particle.alpha = self.life / 60;
		if (self.life <= 0) {
			self.destroy();
		}
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.speed = -4;
	self.scored = false;
	// Dynamic gap height that decreases with score for progressive difficulty
	var gapReduction = LK.getScore() * 5; // Reduce gap by 5px per point
	self.gapHeight = Math.max(250, 350 - gapReduction); // Minimum gap of 250px
	// Create top pipe
	self.topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Create bottom pipe
	self.bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0
	});
	// Extend pipes to fill entire screen height
	self.topPipe.height = 2732;
	self.bottomPipe.height = 2732;
	self.setGapPosition = function (centerY) {
		self.topPipe.y = centerY - self.gapHeight / 2;
		self.bottomPipe.y = centerY + self.gapHeight / 2;
	};
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
var PowerUp = Container.expand(function (type) {
	var self = Container.call(this);
	self.speed = -4;
	self.type = type;
	self.collected = false;
	var powerUpGraphics;
	if (type === 'speed') {
		powerUpGraphics = self.attachAsset('speedPowerUp', {
			anchorX: 0.5,
			anchorY: 0.5
		});
	} else if (type === 'invincibility') {
		powerUpGraphics = self.attachAsset('invincibilityPowerUp', {
			anchorX: 0.5,
			anchorY: 0.5
		});
	}
	// Add pulsing animation
	self.pulseTime = 0;
	// Add glow effect using tween
	tween(powerUpGraphics, {
		alpha: 0.6
	}, {
		duration: 800,
		yoyo: true,
		repeat: -1
	});
	self.update = function () {
		self.x += self.speed;
		// Pulsing animation
		self.pulseTime += 0.2;
		var scale = 1 + Math.sin(self.pulseTime) * 0.2;
		powerUpGraphics.scaleX = scale;
		powerUpGraphics.scaleY = scale;
	};
	return self;
});
var TrailNode = Container.expand(function (x, y) {
	var self = Container.call(this);
	var trail = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	trail.alpha = 0.3;
	trail.scaleX = 0.7;
	trail.scaleY = 0.7;
	trail.tint = 0x88CCFF;
	self.x = x;
	self.y = y;
	self.life = 20; // Trail lasts 20 frames
	self.update = function () {
		self.life--;
		trail.alpha = self.life / 20 * 0.3;
		if (self.life <= 0) {
			self.destroy();
		}
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var bird;
var pipes = [];
var powerUps = [];
var particles = [];
var trails = [];
var ground;
var gameStarted = false;
var pipeSpawnTimer = 0;
var pipeSpawnInterval = 240; // Spawn pipe every 4 seconds at 60fps for much more spacing
var powerUpSpawnTimer = 0;
var powerUpSpawnInterval = 480; // Spawn power-up every 8 seconds to match increased spacing
var speedBoostTimer = 0;
var invincibilityTimer = 0;
var comboScore = 0;
var comboTimer = 0;
var trailTimer = 0;
var currentMusicTrack = null;
// Create score display
var scoreTxt = new Text2('0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
scoreTxt.y = 50;
// Create speed indicator
var speedTxt = new Text2('SPEED: 1x', {
	size: 40,
	fill: 0xFFD700
});
speedTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(speedTxt);
speedTxt.x = -20;
speedTxt.y = 120;
// Create combo display
var comboTxt = new Text2('', {
	size: 50,
	fill: 0xFF6B35
});
comboTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(comboTxt);
comboTxt.y = 150;
comboTxt.visible = false;
// Create ground
ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0
}));
ground.x = 0;
ground.y = 2732 - 100;
ground.width = 2048 * 3; // Make ground wider for scrolling effect
ground.scrollSpeed = -2;
// Create bird
bird = game.addChild(new Bird());
bird.x = 300;
bird.y = 1366; // Middle of screen
bird.startY = 1366;
bird.floatTime = 0;
// Add gentle floating animation before game starts
bird.updateFloat = function () {
	if (!gameStarted) {
		bird.floatTime += 0.1;
		bird.y = bird.startY + Math.sin(bird.floatTime) * 20;
	}
};
// Create instruction text
var instructionTxt = new Text2('TAP TO FLAP', {
	size: 60,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0.5);
instructionTxt.x = 1024;
instructionTxt.y = 1000;
game.addChild(instructionTxt);
function startGame() {
	gameStarted = true;
	instructionTxt.visible = false;
	bird.flap();
}
function spawnPipe() {
	var pipe = new Pipe();
	pipe.x = 2048 + 60; // Start off screen
	// Random gap position (avoid too high or too low)
	var minGapCenter = 200;
	var maxGapCenter = 2732 - 200 - 100; // Account for ground
	var gapCenter = minGapCenter + Math.random() * (maxGapCenter - minGapCenter);
	pipe.setGapPosition(gapCenter);
	pipes.push(pipe);
	game.addChild(pipe);
}
function createTrail() {
	var trail = new TrailNode(bird.x, bird.y);
	trails.push(trail);
	game.addChild(trail);
}
function updateCombo() {
	comboScore++;
	comboTimer = 180; // 3 seconds
	if (comboScore >= 3) {
		comboTxt.setText('COMBO x' + comboScore + '!');
		comboTxt.visible = true;
		LK.effects.flashObject(comboTxt, 0xFF6B35, 500);
	}
}
function resetCombo() {
	comboScore = 0;
	comboTimer = 0;
	comboTxt.visible = false;
}
function spawnPowerUp() {
	var types = ['speed', 'invincibility'];
	var type = types[Math.floor(Math.random() * types.length)];
	var powerUp = new PowerUp(type);
	powerUp.x = 2048 + 20;
	powerUp.y = 200 + Math.random() * (2732 - 400 - 100);
	powerUps.push(powerUp);
	game.addChild(powerUp);
}
function createParticleEffect(x, y, color, count) {
	for (var i = 0; i < count; i++) {
		var particle = new Particle(x, y, color);
		particles.push(particle);
		game.addChild(particle);
	}
}
function checkCollisions() {
	// Check ground collision
	if (bird.y + 30 > ground.y) {
		if (invincibilityTimer <= 0) {
			gameOver();
			return;
		}
	}
	// Check ceiling collision
	if (bird.y - 30 < 0) {
		if (invincibilityTimer <= 0) {
			gameOver();
			return;
		}
	}
	// Check pipe collisions
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		// Check if bird is in pipe's x range
		if (bird.x + 30 > pipe.x - 60 && bird.x - 30 < pipe.x + 60) {
			// Check collision with top pipe
			if (bird.y - 22 < pipe.topPipe.y) {
				if (invincibilityTimer <= 0) {
					gameOver();
					return;
				}
			}
			// Check collision with bottom pipe
			if (bird.y + 22 > pipe.bottomPipe.y) {
				if (invincibilityTimer <= 0) {
					gameOver();
					return;
				}
			}
		}
		// Check for scoring
		if (!pipe.scored && bird.x > pipe.x + 60) {
			pipe.scored = true;
			var basePoints = 1;
			var bonusPoints = comboScore >= 3 ? comboScore : 0;
			var totalPoints = basePoints + bonusPoints;
			LK.setScore(LK.getScore() + totalPoints);
			scoreTxt.setText(LK.getScore());
			LK.getSound('score').play();
			// Flash score text when scoring
			LK.effects.flashObject(scoreTxt, 0xFFD700, 300);
			// Update combo system
			updateCombo();
			// Create particles for high combos
			if (comboScore >= 5) {
				createParticleEffect(bird.x, bird.y, 0xFFD700, 6);
			}
		}
	}
	// Check power-up collisions
	for (var j = 0; j < powerUps.length; j++) {
		var powerUp = powerUps[j];
		if (!powerUp.collected && bird.intersects(powerUp)) {
			powerUp.collected = true;
			LK.getSound('powerup').play();
			if (powerUp.type === 'speed') {
				speedBoostTimer = 300; // 5 seconds
				createParticleEffect(powerUp.x, powerUp.y, 0xFF6B35, 8);
			} else if (powerUp.type === 'invincibility') {
				invincibilityTimer = 180; // 3 seconds
				createParticleEffect(powerUp.x, powerUp.y, 0x4ECDC4, 8);
			}
			powerUp.destroy();
			powerUps.splice(j, 1);
			j--;
		}
	}
}
function gameOver() {
	LK.getSound('hit').play();
	LK.showGameOver();
}
function cleanupPipes() {
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		if (pipe.x < -120) {
			pipe.destroy();
			pipes.splice(i, 1);
		}
	}
}
function cleanupPowerUps() {
	for (var i = powerUps.length - 1; i >= 0; i--) {
		var powerUp = powerUps[i];
		if (powerUp.x < -60) {
			powerUp.destroy();
			powerUps.splice(i, 1);
		}
	}
}
function cleanupParticles() {
	for (var i = particles.length - 1; i >= 0; i--) {
		var particle = particles[i];
		if (particle.life <= 0) {
			particles.splice(i, 1);
		}
	}
}
function cleanupTrails() {
	for (var i = trails.length - 1; i >= 0; i--) {
		var trail = trails[i];
		if (trail.life <= 0) {
			trails.splice(i, 1);
		}
	}
}
// Touch controls
game.down = function (x, y, obj) {
	if (!gameStarted) {
		startGame();
	} else {
		bird.flap();
	}
};
// Game update loop
game.update = function () {
	// Update bird floating animation
	bird.updateFloat();
	if (!gameStarted) {
		return;
	}
	// Start background music when game begins
	if (currentMusicTrack === null) {
		currentMusicTrack = 'bgmusic';
		LK.playMusic('bgmusic');
	}
	// Calculate dynamic base speed based on score for progressive difficulty
	var baseSpeed = -4 - LK.getScore() * 0.1; // Gradually increase speed with score
	if (baseSpeed < -8) baseSpeed = -8; // Cap maximum speed
	// Dynamic music based on game intensity
	var gameIntensity = LK.getScore() + (speedBoostTimer > 0 ? 10 : 0);
	if (gameIntensity >= 15 && currentMusicTrack !== 'fastmusic') {
		currentMusicTrack = 'fastmusic';
		LK.playMusic('fastmusic', {
			fade: {
				start: 0,
				end: 0.8,
				duration: 1000
			}
		});
	} else if (gameIntensity < 15 && currentMusicTrack !== 'bgmusic') {
		currentMusicTrack = 'bgmusic';
		LK.playMusic('bgmusic', {
			fade: {
				start: 0,
				end: 0.7,
				duration: 1000
			}
		});
	}
	// Create bird trail effect
	trailTimer++;
	if (trailTimer >= 4) {
		// Create trail every 4 frames
		createTrail();
		trailTimer = 0;
	}
	// Update combo timer
	if (comboTimer > 0) {
		comboTimer--;
		if (comboTimer <= 0) {
			resetCombo();
		}
	}
	// Update power-up timers
	if (speedBoostTimer > 0) {
		speedBoostTimer--;
		// Apply speed boost effect to pipes and power-ups
		for (var i = 0; i < pipes.length; i++) {
			pipes[i].speed = baseSpeed - 2; // Faster speed during boost
		}
		for (var j = 0; j < powerUps.length; j++) {
			powerUps[j].speed = baseSpeed - 2;
		}
		ground.scrollSpeed = (baseSpeed - 2) * 0.5;
	} else {
		// Normal speed with progressive difficulty
		for (var i = 0; i < pipes.length; i++) {
			pipes[i].speed = baseSpeed;
		}
		for (var j = 0; j < powerUps.length; j++) {
			powerUps[j].speed = baseSpeed;
		}
		ground.scrollSpeed = baseSpeed * 0.5;
	}
	if (invincibilityTimer > 0) {
		invincibilityTimer--;
		// Flash bird when invincible
		if (invincibilityTimer % 10 < 5) {
			bird.alpha = 0.5;
		} else {
			bird.alpha = 1.0;
		}
	} else {
		bird.alpha = 1.0;
	}
	// Scroll ground for visual effect
	ground.x += ground.scrollSpeed;
	if (ground.x <= -2048) {
		ground.x = 0;
	}
	// Spawn pipes
	pipeSpawnTimer++;
	if (pipeSpawnTimer >= pipeSpawnInterval) {
		spawnPipe();
		pipeSpawnTimer = 0;
	}
	// Spawn power-ups
	powerUpSpawnTimer++;
	if (powerUpSpawnTimer >= powerUpSpawnInterval) {
		spawnPowerUp();
		powerUpSpawnTimer = 0;
	}
	// Add subtle background color shift based on score
	var scoreColorShift = LK.getScore() * 0.01;
	var newBgColor = 0x87CEEB + Math.floor(scoreColorShift * 0x111111);
	if (newBgColor !== game.backgroundColor) {
		game.setBackgroundColor(newBgColor);
	}
	// Update speed indicator
	var speedMultiplier = 1 + LK.getScore() * 0.1;
	if (speedMultiplier > 3) speedMultiplier = 3;
	speedTxt.setText('SPEED: ' + speedMultiplier.toFixed(1) + 'x');
	// Check collisions
	checkCollisions();
	// Clean up off-screen elements
	cleanupPipes();
	cleanupPowerUps();
	cleanupParticles();
	cleanupTrails();
};