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

/**** 
* Classes
****/ 
// Character: the player-controlled ellipse
var Character = Container.expand(function () {
	var self = Container.call(this);
	var _char = self.attachAsset('character', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Physics
	self.velocity = 0;
	self.gravity = 2.2;
	self.flapStrength = -19;
	// Flap (jump)
	self.flap = function () {
		self.velocity = self.flapStrength;
	};
	// Update position and velocity
	self.update = function () {
		self.velocity += self.gravity;
		self.y += self.velocity;
	};
	// For collision detection
	self.getBounds = function () {
		return {
			x: self.x - _char.width / 2,
			y: self.y - _char.height / 2,
			width: _char.width,
			height: _char.height
		};
	};
	return self;
});
// Gold: collectible coin between pipes
var Gold = Container.expand(function () {
	var self = Container.call(this);
	var _gold = self.attachAsset('gold', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.collected = false;
	self._bobPhase = Math.random() * Math.PI * 2; // randomize phase so coins don't bob in sync
	self.update = function () {
		self.x += self.speed;
		// Animate gold with a gentle up-and-down bobbing motion
		self.y += Math.sin(LK.ticks / 18 + self._bobPhase) * 1.5;
	};
	// For collision detection
	self.getBounds = function () {
		return {
			x: self.x - _gold.width / 2,
			y: self.y - _gold.height / 2,
			width: _gold.width,
			height: _gold.height
		};
	};
	return self;
});
// PipePair: a pair of pipes (top and bottom) with a gap
var PipePair = Container.expand(function () {
	var self = Container.call(this);
	// Pipe dimensions
	var pipeWidth = 220;
	var pipeHeight = 1200;
	var gapHeight = 500; // Will be set dynamically
	// Top pipe
	var topPipe = self.attachAsset('pipe_top', {
		anchorX: 0,
		anchorY: 1
	});
	// Bottom pipe
	var bottomPipe = self.attachAsset('pipe_bottom', {
		anchorX: 0,
		anchorY: 0
	});
	// Set pipes' positions based on gapY and gapHeight
	self.setGap = function (gapY, gapHeight) {
		// Top pipe: bottom at gapY
		topPipe.x = 0;
		topPipe.y = gapY;
		topPipe.height = gapY;
		// Bottom pipe: top at gapY+gapHeight
		bottomPipe.x = 0;
		bottomPipe.y = gapY + gapHeight;
		bottomPipe.height = 2732 - (gapY + gapHeight);
	};
	// For collision detection
	self.getTopPipe = function () {
		return topPipe;
	};
	self.getBottomPipe = function () {
		return bottomPipe;
	};
	// Move pipes leftward
	self.update = function () {
		self.x += self.speed;
	};
	// Set initial speed
	self.speed = -12;
	return self;
});
// Powerup: special collectible (separate from Gold)
var Powerup = Container.expand(function () {
	var self = Container.call(this);
	var _powerup = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.collected = false;
	self._bobPhase = Math.random() * Math.PI * 2;
	self.update = function () {
		self.x += self.speed;
		// Animate with a gentle up-and-down bobbing motion
		self.y += Math.sin(LK.ticks / 18 + self._bobPhase) * 1.5;
	};
	self.getBounds = function () {
		return {
			x: self.x - _powerup.width / 2,
			y: self.y - _powerup.height / 2,
			width: _powerup.width,
			height: _powerup.height
		};
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x4db8ff // Light blue sky
});

/**** 
* Game Code
****/ 
// unique icon for powerup
// Background landscape and clouds
// Game constants
// Pipes: green boxes, character: yellow ellipse, background: blue
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var PIPE_WIDTH = 220;
var PIPE_GAP_MIN = 480;
var PIPE_GAP_MAX = 700;
var PIPE_DISTANCE = 900; // Horizontal distance between pipes
var PIPE_SPEED_START = -7; // Slower initial pipe speed
var PIPE_SPEED_MAX = -28;
var PIPE_FREQ_START = 120; // Pipes appear less frequently at start
var PIPE_FREQ_MIN = 45;
var GRAVITY_START = 1.05; // Slightly lower gravity for even gentler fall
var FLAP_STRENGTH = -22;
// Game variables
var pipes = [];
var golds = [];
var character;
var score = 0;
var scoreTxt;
var lastPipeTick = 0;
var pipeFreq = PIPE_FREQ_START;
var pipeSpeed = PIPE_SPEED_START;
var gameStarted = false;
var gameOver = false;
// Add background landscape (two for seamless looping)
var bgLandscape = LK.getAsset('bg_landscape', {
	anchorX: 0,
	anchorY: 1,
	x: 0,
	y: GAME_HEIGHT,
	width: GAME_WIDTH,
	height: 600
});
var bgLandscape2 = LK.getAsset('bg_landscape', {
	anchorX: 0,
	anchorY: 1,
	x: GAME_WIDTH,
	y: GAME_HEIGHT,
	width: GAME_WIDTH,
	height: 600
});
game.addChild(bgLandscape);
game.addChild(bgLandscape2);
// Add clouds (3 clouds at different positions and scales)
var clouds = [];
for (var i = 0; i < 3; i++) {
	var cloud = LK.getAsset('cloud', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 400 + i * 600,
		y: 300 + i * 120,
		scaleX: 0.8 + 0.3 * Math.random(),
		scaleY: 0.8 + 0.3 * Math.random()
	});
	game.addChild(cloud);
	clouds.push(cloud);
}
// Add score text to GUI
scoreTxt = new Text2('0', {
	size: 150,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Center score text horizontally, avoid top left 100x100
scoreTxt.x = LK.gui.top.width / 2;
scoreTxt.y = 40;
// Create character and position
character = new Character();
game.addChild(character);
character.x = GAME_WIDTH * 0.35;
character.y = GAME_HEIGHT / 2;
character.gravity = GRAVITY_START;
character.flapStrength = FLAP_STRENGTH;
// Reset game state
function resetGame() {
	// Remove pipes
	for (var i = pipes.length - 1; i >= 0; i--) {
		pipes[i].destroy();
		pipes.splice(i, 1);
	}
	// Remove golds
	for (var i = golds.length - 1; i >= 0; i--) {
		golds[i].destroy();
		golds.splice(i, 1);
	}
	// Reset character
	character.x = GAME_WIDTH * 0.35;
	character.y = GAME_HEIGHT / 2;
	character.velocity = 0;
	character.gravity = GRAVITY_START;
	character.flapStrength = FLAP_STRENGTH;
	// Reset variables
	score = 0;
	scoreTxt.setText(score);
	lastPipeTick = 0;
	pipeFreq = PIPE_FREQ_START; // Use new slower frequency
	pipeSpeed = PIPE_SPEED_START; // Use new slower speed
	gameStarted = false;
	gameOver = false;
}
// Start game on first tap
function startGame() {
	if (!gameStarted && !gameOver) {
		gameStarted = true;
		character.flap();
	}
}
// Flap on tap/click
game.down = function (x, y, obj) {
	if (gameOver) return;
	if (!gameStarted) {
		startGame();
	} else {
		character.flap();
	}
};
// Main update loop
game.update = function () {
	if (gameOver) return;
	// Animate clouds (move right to left, loop)
	for (var i = 0; i < clouds.length; i++) {
		var cloud = clouds[i];
		cloud.x -= 0.7 + 0.2 * i;
		if (cloud.x < -cloud.width / 2) {
			cloud.x = GAME_WIDTH + cloud.width / 2 + Math.random() * 200;
			cloud.y = 200 + Math.random() * 400 + i * 100;
		}
	}
	// Animate background landscape to move leftward and loop
	bgLandscape.x -= Math.abs(pipeSpeed) * 0.5;
	bgLandscape2.x -= Math.abs(pipeSpeed) * 0.5;
	// Loop both backgrounds for seamless scrolling
	if (bgLandscape.x <= -GAME_WIDTH) {
		bgLandscape.x = bgLandscape2.x + GAME_WIDTH;
	}
	if (bgLandscape2.x <= -GAME_WIDTH) {
		bgLandscape2.x = bgLandscape.x + GAME_WIDTH;
	}
	if (!gameStarted) {
		// Idle animation: bob up and down
		character.y = GAME_HEIGHT / 2 + Math.sin(LK.ticks / 30) * 30;
		return;
	}
	// Character physics
	character.update();
	// Clamp character to screen
	if (character.y < character.attachAsset('character', {
		anchorX: 0.5,
		anchorY: 0.5
	}).height / 2) {
		character.y = character.attachAsset('character', {
			anchorX: 0.5,
			anchorY: 0.5
		}).height / 2;
		character.velocity = 0;
	}
	if (character.y > GAME_HEIGHT - character.attachAsset('character', {
		anchorX: 0.5,
		anchorY: 0.5
	}).height / 2) {
		character.y = GAME_HEIGHT - character.attachAsset('character', {
			anchorX: 0.5,
			anchorY: 0.5
		}).height / 2;
		character.velocity = 0;
		triggerGameOver();
		return;
	}
	// Pipes movement and collision
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipePair = pipes[i];
		pipePair.update();
		// Remove pipes off screen
		if (pipePair.x + PIPE_WIDTH < 0) {
			pipePair.destroy();
			pipes.splice(i, 1);
			continue;
		}
		// Collision detection
		var charBounds = character.getBounds();
		var topPipe = pipePair.getTopPipe();
		var bottomPipe = pipePair.getBottomPipe();
		// Top pipe collision
		if (rectsIntersect(charBounds, {
			x: pipePair.x,
			y: 0,
			width: PIPE_WIDTH,
			height: topPipe.height
		})) {
			triggerGameOver();
			return;
		}
		// Bottom pipe collision
		if (rectsIntersect(charBounds, {
			x: pipePair.x,
			y: bottomPipe.y,
			width: PIPE_WIDTH,
			height: bottomPipe.height
		})) {
			triggerGameOver();
			return;
		}
		// Score: when character passes the pipe (center)
		if (!pipePair.passed && pipePair.x + PIPE_WIDTH / 2 < character.x) {
			pipePair.passed = true;
			score += 1;
			scoreTxt.setText(score);
			// Increase difficulty
			if (pipeFreq > PIPE_FREQ_MIN) {
				pipeFreq -= 2;
				if (pipeFreq < PIPE_FREQ_MIN) pipeFreq = PIPE_FREQ_MIN;
			}
			if (pipeSpeed > PIPE_SPEED_MAX) {
				pipeSpeed -= 0.5;
				if (pipeSpeed < PIPE_SPEED_MAX) pipeSpeed = PIPE_SPEED_MAX;
			}
			character.gravity += 0.02;
		}
	}
	// Golds movement and collection
	for (var i = golds.length - 1; i >= 0; i--) {
		var gold = golds[i];
		gold.update();
		// Remove gold if off screen
		if (gold.x + 50 < 0) {
			gold.destroy();
			golds.splice(i, 1);
			continue;
		}
		// Collision with character
		if (!gold.collected && rectsIntersect(character.getBounds(), gold.getBounds())) {
			gold.collected = true;
			gold.destroy();
			golds.splice(i, 1);
			// Only increase score if this is a Gold, not a Powerup
			if (gold instanceof Gold) {
				score += 3;
				scoreTxt.setText(score);
			}
			// Optionally: add a flash or effect here
		}
	}
	// Pipe spawning
	if (LK.ticks - lastPipeTick >= pipeFreq) {
		spawnPipePair();
		lastPipeTick = LK.ticks;
	}
};
// Rectangle intersection helper
function rectsIntersect(a, b) {
	return a.x < b.x + b.width && a.x + a.width > b.x && a.y < b.y + b.height && a.y + a.height > b.y;
}
// Spawn a new pipe pair
function spawnPipePair() {
	var gapHeight = PIPE_GAP_MIN + Math.floor(Math.random() * (PIPE_GAP_MAX - PIPE_GAP_MIN + 1));
	var minGapY = 180;
	var maxGapY = GAME_HEIGHT - gapHeight - 180;
	var gapY = minGapY + Math.floor(Math.random() * (maxGapY - minGapY + 1));
	var pipePair = new PipePair();
	pipePair.x = GAME_WIDTH;
	pipePair.y = 0;
	pipePair.setGap(gapY, gapHeight);
	pipePair.speed = pipeSpeed;
	pipePair.passed = false;
	pipes.push(pipePair);
	game.addChild(pipePair);
	// 50% chance to spawn Powerup, 50% chance to spawn Gold
	if (Math.random() < 0.5) {
		var powerup = new Powerup();
		powerup.x = pipePair.x + PIPE_WIDTH / 2 + 60;
		powerup.y = gapY + gapHeight / 2;
		powerup.speed = pipeSpeed;
		golds.push(powerup);
		game.addChild(powerup);
	} else {
		var gold = new Gold();
		gold.x = pipePair.x + PIPE_WIDTH / 2 + 60;
		gold.y = gapY + gapHeight / 2;
		gold.speed = pipeSpeed;
		golds.push(gold);
		game.addChild(gold);
	}
}
// Game over logic
function triggerGameOver() {
	if (gameOver) return;
	gameOver = true;
	LK.effects.flashScreen(0xff0000, 800);
	LK.showGameOver();
}
// Reset game on game over
LK.on('gameover', function () {
	resetGame();
});
// Initial game state
resetGame();

===================================================================
--- original.js
+++ change.js
@@ -409,15 +409,24 @@
 	pipePair.speed = pipeSpeed;
 	pipePair.passed = false;
 	pipes.push(pipePair);
 	game.addChild(pipePair);
-	// Always spawn a special powerup instead of gold (100% chance)
-	var powerup = new Powerup();
-	powerup.x = pipePair.x + PIPE_WIDTH / 2 + 60;
-	powerup.y = gapY + gapHeight / 2;
-	powerup.speed = pipeSpeed;
-	golds.push(powerup);
-	game.addChild(powerup);
+	// 50% chance to spawn Powerup, 50% chance to spawn Gold
+	if (Math.random() < 0.5) {
+		var powerup = new Powerup();
+		powerup.x = pipePair.x + PIPE_WIDTH / 2 + 60;
+		powerup.y = gapY + gapHeight / 2;
+		powerup.speed = pipeSpeed;
+		golds.push(powerup);
+		game.addChild(powerup);
+	} else {
+		var gold = new Gold();
+		gold.x = pipePair.x + PIPE_WIDTH / 2 + 60;
+		gold.y = gapY + gapHeight / 2;
+		gold.speed = pipeSpeed;
+		golds.push(gold);
+		game.addChild(gold);
+	}
 }
 // Game over logic
 function triggerGameOver() {
 	if (gameOver) return;