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

/**** 
* Classes
****/ 
// Bonus class
var Bonus = Container.expand(function () {
	var self = Container.call(this);
	var bonusGfx = self.attachAsset('bonus', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Update: move down (relative to world)
	self.update = function (speed) {
		self.y += speed;
	};
	return self;
});
// Climber (player) class
var Climber = Container.expand(function () {
	var self = Container.call(this);
	var climberGfx = self.attachAsset('climber', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// --- Trail logic ---
	// Store last position for trail
	self.lastTrailX = undefined;
	self.lastTrailY = undefined;
	self.trailCooldown = 0;
	// Helper: spawn a single orange trail segment at (x, y)
	self.spawnTrail = function (x, y) {
		// Use a simple orange ellipse as the trail segment
		var trail = LK.getAsset('trail_orange', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: x,
			y: y,
			scaleX: 0.7,
			scaleY: 0.4,
			alpha: 0.5
		});
		// If asset doesn't exist yet, create it as a shape
		if (!trail) {
			trail = LK.getAsset('trail_orange', {
				anchorX: 0.5,
				anchorY: 0.5,
				x: x,
				y: y,
				scaleX: 0.7,
				scaleY: 0.4,
				alpha: 0.5
			});
		}
		// Add to game
		if (game) game.addChild(trail);
		// Animate fade out and shrink, then destroy
		tween(trail, {
			alpha: 0,
			scaleX: 0.2,
			scaleY: 0.1
		}, {
			duration: 320,
			easing: tween.quadIn,
			onFinish: function onFinish() {
				if (trail && trail.parent) trail.parent.removeChild(trail);
			}
		});
	};
	// State: which wall (0 = left, 1 = right)
	self.wallSide = 0;
	// Vertical speed (pixels per tick)
	self.vy = 10;
	// Horizontal jump speed (pixels per tick)
	self.vx = 0;
	// Is currently jumping
	self.isJumping = false;
	// Target wall x
	self.targetX = 0;
	// Jump to the other wall
	self.jump = function () {
		// If already jumping, allow to interrupt and jump to the other wall
		if (self.isJumping) {
			// Instantly stop current tween by setting isJumping to false
			self.isJumping = false;
		}
		self.wallSide = 1 - self.wallSide;
		self.isJumping = true;
		// Set target x (climber sits just outside the wall, not inside)
		if (self.wallSide === 0) {
			self.targetX = wallLeftX + wallWidth / 2 + climberWidth / 2 + 2;
		} else {
			self.targetX = wallRightX - wallWidth / 2 - climberWidth / 2 - 2;
		}
		// Add a diagonal jump: also move y a bit up, then back to fixed y
		var jumpPeakY = self.y - 180; // jump up by 180px
		var originalY = self.y;
		// Determine tilt direction: right jump = tilt left, left jump = tilt right
		var tiltAngle = 0;
		if (self.wallSide === 0) {
			// Jumping to left wall, tilt slightly right
			tiltAngle = Math.PI / 16;
		} else {
			// Jumping to right wall, tilt slightly left
			tiltAngle = -Math.PI / 16;
		}
		// Animate jump with smooth physics using easing for both X and Y
		// Also animate rotation for tilt
		tween(self, {
			x: self.targetX,
			y: jumpPeakY,
			rotation: tiltAngle
		}, {
			duration: 180,
			easing: tween.cubicOut,
			onFinish: function onFinish() {
				// Fall back to original y and reset tilt with smooth ease
				tween(self, {
					y: originalY,
					rotation: 0
				}, {
					duration: 180,
					easing: tween.bounceOut,
					onFinish: function onFinish() {
						self.x = self.targetX;
						self.isJumping = false;
					}
				});
			}
		});
	};
	// Update: move up and spawn trail
	self.update = function () {
		// Move up
		self.y -= self.vy;
		// Trail: spawn a segment if moved enough
		if (self.lastTrailX === undefined || self.lastTrailY === undefined) {
			self.lastTrailX = self.x;
			self.lastTrailY = self.y;
		}
		// Only spawn trail if moved at least 18px (vertical) or 8px (horizontal)
		var dx = self.x - self.lastTrailX;
		var dy = self.y - self.lastTrailY;
		if (dx * dx + dy * dy > 64) {
			self.spawnTrail(self.x, self.y + climberHeight * 0.18);
			self.lastTrailX = self.x;
			self.lastTrailY = self.y;
		}
	};
	return self;
});
// Obstacle class
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obsGfx = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Update: move down (relative to world)
	self.update = function (speed) {
		self.y += speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// --- Constants ---
var wallWidth = 180;
var climberWidth = 120;
var climberHeight = 120;
// Make the gap between walls much narrower and ensure climber fits
var wallGap = 420;
var wallLeftX = (2048 - wallGap) / 2 - wallWidth / 2;
var wallRightX = (2048 + wallGap) / 2 + wallWidth / 2;
var playTopMargin = 100; // leave top 100px for menu
var playBottomMargin = 0;
// --- State ---
var climber;
var obstacles = [];
var bonuses = [];
var distance = 0; // in pixels
var bonusScore = 0;
var scrollSpeed = 18; // initial vertical speed (pixels per tick) - increased for faster game
var speedIncreaseEvery = 400; // increase speed more frequently
var speedIncreaseAmount = 1.2; // increase speed more per step
var maxScrollSpeed = 48; // allow higher max speed
var lastObstacleY = 0;
var lastBonusY = 0;
var obstacleSpacing = 420 * 1.1; // min vertical distance between obstacles, increased by 10%
var bonusSpacing = 900; // min vertical distance between bonuses
var scoreTxt;
// --- Obstacle damage protection & opacity ---
var obstacleDamageEnabled = false;
var obstacleOpacity = 0.35; // Start with 35% opacity
// Set all current obstacles to given opacity
function setAllObstacleOpacity(alpha) {
	for (var i = 0; i < obstacles.length; i++) {
		if (obstacles[i] && obstacles[i].children && obstacles[i].children[0]) {
			obstacles[i].children[0].alpha = alpha;
		}
	}
}
// Set initial opacity
setAllObstacleOpacity(obstacleOpacity);
// At 1s: blink between 0.35 and 0.6 for 1s, then set to 0.6
LK.setTimeout(function () {
	var blinkCount = 0;
	var blinkInterval = LK.setInterval(function () {
		blinkCount++;
		// Alternate between 0.35 and 0.6 every 100ms
		obstacleOpacity = blinkCount % 2 === 0 ? 0.35 : 0.6;
		setAllObstacleOpacity(obstacleOpacity);
		if (blinkCount >= 10) {
			// 1s total (10 blinks)
			LK.clearInterval(blinkInterval);
			obstacleOpacity = 0.6;
			setAllObstacleOpacity(obstacleOpacity);
		}
	}, 100);
}, 1000);
// At 2s: set to 1.0 and enable damage
LK.setTimeout(function () {
	obstacleDamageEnabled = true;
	obstacleOpacity = 1.0;
	setAllObstacleOpacity(obstacleOpacity);
	// After 2s, always force obstacleOpacity to 1.0 for all future obstacles
	setAllObstacleOpacity = function setAllObstacleOpacity(alpha) {
		for (var i = 0; i < obstacles.length; i++) {
			if (obstacles[i] && obstacles[i].children && obstacles[i].children[0]) {
				obstacles[i].children[0].alpha = 1.0;
			}
		}
	};
}, 2000);
// --- Walls ---
// Walls removed: no wall graphics are added to the game
// --- Climber ---
climber = new Climber();
climber.x = wallLeftX + wallWidth / 2 + climberWidth / 2;
climber.y = 2732 / 2; // start at vertical center of the screen
game.addChild(climber);
// --- Score Display ---
scoreTxt = new Text2('0 m', {
	size: 120,
	fill: 0xFFF700
});
scoreTxt.anchor.set(0, 0); // anchor left
LK.gui.topLeft.addChild(scoreTxt);
// Heart (life) display
var maxLives = 3;
var lives = maxLives;
var heartIcons = [];
for (var i = 0; i < maxLives; i++) {
	var heart = new Text2("❤", {
		size: 110,
		fill: 0xFF3C3C
	});
	heart.anchor.set(1, 0); // right-top
	heart.x = -i * 90; // space hearts to the left
	heart.y = 0;
	LK.gui.topRight.addChild(heart);
	heartIcons.push(heart);
}
function updateHearts() {
	for (var i = 0; i < heartIcons.length; i++) {
		heartIcons[i].alpha = i < lives ? 1 : 0.25;
	}
}
updateHearts();
// --- Helper: format distance ---
function formatDistance(px) {
	var meters = Math.floor(px / 10);
	if (meters < 1000) return meters + " m";
	return (meters / 1000).toFixed(2) + " km";
}
// --- Helper: update score text ---
function updateScoreText() {
	var meters = Math.floor(distance / 10);
	scoreTxt.setText(meters + " m");
}
// --- Helper: spawn obstacle ---
function spawnObstacle() {
	// Randomly pick left or right wall
	var side = Math.random() < 0.5 ? 0 : 1;
	var obs = new Obstacle();
	if (side === 0) {
		obs.x = wallLeftX + wallWidth / 2 + climberWidth / 2 + 2;
		obs.children[0].flipX = 1; // Mirror horizontally for left-side obstacles
	} else {
		obs.x = wallRightX - wallWidth / 2 - climberWidth / 2 - 2;
		obs.children[0].flipX = 0; // No flip for right-side obstacles
	}
	// Set opacity according to current global value
	if (obs.children && obs.children[0]) {
		// After 800m, always set to 1.0
		if (distance >= 8000) {
			obs.children[0].alpha = 1.0;
		} else {
			obs.children[0].alpha = obstacleOpacity;
		}
	}
	obs.y = lastObstacleY - obstacleSpacing - Math.random() * 220;
	obstacles.push(obs);
	game.addChild(obs);
	lastObstacleY = obs.y;
}
// --- Helper: spawn bonus ---
function spawnBonus() {
	var bonus = new Bonus();
	bonus.x = 2048 / 2;
	bonus.y = lastBonusY - bonusSpacing - Math.random() * 400;
	bonuses.push(bonus);
	game.addChild(bonus);
	lastBonusY = bonus.y;
}
// --- Initial obstacles/bonuses ---
// Start obstacles and bonuses from the bottom of the screen
lastObstacleY = 2732 - climberHeight / 2;
lastBonusY = 2732 - climberHeight / 2;
// Delay obstacle and bonus spawning by 1 second, then spawn at 2 second intervals
LK.setTimeout(function () {
	for (var i = 0; i < 6; i++) {
		spawnObstacle();
	}
	for (var i = 0; i < 2; i++) {
		spawnBonus();
	}
	// Set interval to spawn obstacles every 2 seconds (2000ms)
	LK.setInterval(function () {
		spawnObstacle();
	}, 2000);
}, 1000);
// --- Input: tap to jump ---
game.down = function (x, y, obj) {
	// Allow jump if not already moving to the same wall (ignore isJumping)
	var nextWall = 1 - climber.wallSide;
	// Only allow jump if not already moving to that wall
	if (!(climber.isJumping && climber.targetX === (nextWall === 0 ? wallLeftX + wallWidth / 2 + climberWidth / 2 + 2 : wallRightX - wallWidth / 2 - climberWidth / 2 - 2))) {
		climber.jump();
	}
};
// --- Move handler (not used for drag, but required by LK) ---
game.move = function (x, y, obj) {};
// --- Main update loop ---
game.update = function () {
	// Increase speed every 1000 meters (10,000 pixels)
	// Also increase obstacleSpacing by 0.1x every 1000m
	if (!game.lastSpeedMilestone) game.lastSpeedMilestone = 0;
	var metersNow = Math.floor(distance / 10);
	if (metersNow - game.lastSpeedMilestone >= 1000 && metersNow <= 5000) {
		scrollSpeed *= 1.2;
		if (scrollSpeed > maxScrollSpeed) scrollSpeed = maxScrollSpeed;
		climber.vy = scrollSpeed;
		// Increase obstacleSpacing by 0.1x (10%) every 1000m
		obstacleSpacing *= 1.1;
		game.lastSpeedMilestone += 1000;
	}
	// Keep climber fixed at the vertical center of the screen, move obstacles/bonuses down by scrollSpeed
	var screenClimberY = 2732 / 2; // fixed Y position for climber at vertical center
	climber.y = screenClimberY;
	// Move all obstacles and bonuses down by scrollSpeed
	for (var i = 0; i < obstacles.length; i++) {
		obstacles[i].y += scrollSpeed;
		// After 800m (8000px), always force obstacle opacity to 1.0
		if (distance >= 8000 && obstacles[i].children && obstacles[i].children[0]) {
			obstacles[i].children[0].alpha = 1.0;
		}
	}
	for (var j = 0; j < bonuses.length; j++) {
		bonuses[j].y += scrollSpeed;
	}
	// Walls removed: no wall movement needed
	// Update distance
	distance += scrollSpeed;
	updateScoreText();
	// Move obstacles and check collision
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		// If obstacle goes off the bottom, move it back to the top with new random Y and side
		if (obs.y > 2732 + 100) {
			// Randomly pick left or right wall
			var side = Math.random() < 0.5 ? 0 : 1;
			if (side === 0) {
				obs.x = wallLeftX + wallWidth / 2 + climberWidth / 2 + 2;
				obs.children[0].flipX = 1; // Mirror horizontally for left-side obstacles
			} else {
				obs.x = wallRightX - wallWidth / 2 - climberWidth / 2 - 2;
				obs.children[0].flipX = 0; // No flip for right-side obstacles
			}
			// Set opacity according to current global value
			if (obs.children && obs.children[0]) {
				// After 800m, always set to 1.0
				if (distance >= 8000) {
					obs.children[0].alpha = 1.0;
				} else {
					obs.children[0].alpha = obstacleOpacity;
				}
			}
			// Place above the highest obstacle
			var highestY = climber.y - 400;
			for (var k = 0; k < obstacles.length; k++) {
				if (obstacles[k].y < highestY) highestY = obstacles[k].y;
			}
			obs.y = highestY - obstacleSpacing - Math.random() * 220;
			lastObstacleY = obs.y;
		}
		// Collision: only if climber is on same wall and overlaps in Y
		if (Math.abs(obs.x - climber.x) < climberWidth / 2 + 10 && Math.abs(obs.y - screenClimberY) < climberHeight / 2 + 30) {
			if (obstacleDamageEnabled) {
				LK.effects.flashScreen(0xff0000, 800);
				lives--;
				updateHearts();
				if (lives <= 0) {
					LK.showGameOver();
					return;
				}
				// Temporary invulnerability for 1s after hit
				obstacleDamageEnabled = false;
				setAllObstacleOpacity(0.5);
				LK.setTimeout(function () {
					obstacleDamageEnabled = true;
					setAllObstacleOpacity(1.0);
				}, 1000);
			}
		}
	}
	// Move bonuses and check collection
	for (var j = bonuses.length - 1; j >= 0; j--) {
		var b = bonuses[j];
		// If bonus goes off the bottom, move it back to the top (like obstacles)
		if (b.y > 2732 + 100) {
			// Place above the highest bonus
			var highestBonusY = climber.y - 800;
			for (var k = 0; k < bonuses.length; k++) {
				if (bonuses[k].y < highestBonusY) highestBonusY = bonuses[k].y;
			}
			b.y = highestBonusY - bonusSpacing - Math.random() * 400;
			lastBonusY = b.y;
			continue;
		}
		// Collect
		if (Math.abs(b.x - climber.x) < climberWidth / 2 + 40 && Math.abs(b.y - screenClimberY) < climberHeight / 2 + 40) {
			bonusScore += 10;
			// Add 100m (1000px) to distance when collecting a yellow bonus
			distance += 1000;
			updateScoreText();
			LK.effects.flashObject(b, 0xffff00, 400);
			// Move collected bonus to top (infinite)
			var highestBonusY = climber.y - 800;
			for (var k = 0; k < bonuses.length; k++) {
				if (bonuses[k].y < highestBonusY) highestBonusY = bonuses[k].y;
			}
			b.y = highestBonusY - bonusSpacing - Math.random() * 400;
			lastBonusY = b.y;
			continue;
		}
	}
	// Spawn new obstacles/bonuses as needed for infinite runner
	while (lastObstacleY > climber.y - 1200) {
		spawnObstacle();
	}
	while (lastBonusY > climber.y - 1800) {
		spawnBonus();
	}
};
// --- Reset state on game over ---
game.on('gameover', function () {
	// All state will be reset by LK, so nothing to do here
});
// --- You win (not used in endless) ---
game.on('youwin', function () {
	// Not used
});

===================================================================
--- original.js
+++ change.js
@@ -358,9 +358,9 @@
 	// Increase speed every 1000 meters (10,000 pixels)
 	// Also increase obstacleSpacing by 0.1x every 1000m
 	if (!game.lastSpeedMilestone) game.lastSpeedMilestone = 0;
 	var metersNow = Math.floor(distance / 10);
-	if (metersNow - game.lastSpeedMilestone >= 1000) {
+	if (metersNow - game.lastSpeedMilestone >= 1000 && metersNow <= 5000) {
 		scrollSpeed *= 1.2;
 		if (scrollSpeed > maxScrollSpeed) scrollSpeed = maxScrollSpeed;
 		climber.vy = scrollSpeed;
 		// Increase obstacleSpacing by 0.1x (10%) every 1000m