/**** 
* 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
	});
	// 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;
		// Animate jump with smooth physics using easing for both X and Y
		tween(self, {
			x: self.targetX,
			y: jumpPeakY
		}, {
			duration: 180,
			easing: tween.cubicOut,
			onFinish: function onFinish() {
				// Fall back to original y with smooth ease
				tween(self, {
					y: originalY
				}, {
					duration: 180,
					easing: tween.bounceOut,
					onFinish: function onFinish() {
						self.x = self.targetX;
						self.isJumping = false;
					}
				});
			}
		});
	};
	// Update: move up
	self.update = function () {
		self.y -= self.vy;
	};
	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;
// --- 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(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// --- 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
	}
	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)
	if (!game.lastSpeedMilestone) game.lastSpeedMilestone = 0;
	var metersNow = Math.floor(distance / 10);
	if (metersNow - game.lastSpeedMilestone >= 1000) {
		scrollSpeed *= 1.2;
		if (scrollSpeed > maxScrollSpeed) scrollSpeed = maxScrollSpeed;
		climber.vy = scrollSpeed;
		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;
	}
	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
			}
			// 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) {
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
			return;
		}
	}
	// 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;
			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
@@ -167,34 +167,38 @@
 	} else {
 		obs.x = wallRightX - wallWidth / 2 - climberWidth / 2 - 2;
 		obs.children[0].flipX = 0; // No flip for right-side obstacles
 	}
-	obs.y = lastObstacleY + obstacleSpacing + Math.random() * 220;
+	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;
+	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 top of the screen
-lastObstacleY = playTopMargin + climberHeight / 2;
-lastBonusY = playTopMargin + climberHeight / 2;
-// Delay obstacle and bonus spawning by 1 second
+// 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)
@@ -244,10 +248,14 @@
 			} else {
 				obs.x = wallRightX - wallWidth / 2 - climberWidth / 2 - 2;
 				obs.children[0].flipX = 0; // No flip for right-side obstacles
 			}
-			// Place at the top of the screen
-			obs.y = playTopMargin + climberHeight / 2 + Math.random() * 200;
+			// 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) {
@@ -260,10 +268,14 @@
 	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 at the top of the screen
-			b.y = playTopMargin + climberHeight / 2 + Math.random() * 400;
+			// 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
@@ -271,18 +283,22 @@
 			bonusScore += 10;
 			updateScoreText();
 			LK.effects.flashObject(b, 0xffff00, 400);
 			// Move collected bonus to top (infinite)
-			b.y = playTopMargin + climberHeight / 2 + Math.random() * 400;
+			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 < 2732 + 1200) {
+	while (lastObstacleY > climber.y - 1200) {
 		spawnObstacle();
 	}
-	while (lastBonusY < 2732 + 1800) {
+	while (lastBonusY > climber.y - 1800) {
 		spawnBonus();
 	}
 };
 // --- Reset state on game over ---