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

/**** 
* Classes
****/ 
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.collected = false;
	self.rotationSpeed = 0.1;
	self.update = function () {
		if (!self.collected) {
			coinGraphics.rotation += self.rotationSpeed;
		}
	};
	self.collect = function () {
		if (!self.collected) {
			self.collected = true;
			LK.getSound('coin').play();
			LK.setScore(LK.getScore() + 50);
			coinsCollected++;
			updateScoreDisplay();
			updateCoinDisplay();
			tween(self, {
				scaleX: 2,
				scaleY: 2,
				alpha: 0
			}, {
				duration: 300,
				onFinish: function onFinish() {
					self.destroy();
				}
			});
		}
	};
	return self;
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.velocityX = 2;
	self.speed = 2;
	self.alive = true;
	self.direction = 1;
	self.update = function () {
		if (!self.alive) {
			return;
		}
		self.x += self.velocityX * self.direction;
		// Reverse direction at platform edges
		var onPlatform = false;
		for (var i = 0; i < platforms.length; i++) {
			var platform = platforms[i];
			if (self.y >= platform.y - 5 && self.y <= platform.y + platform.platformHeight + 5) {
				if (self.x < platform.x || self.x > platform.x + platform.platformWidth) {
					self.direction *= -1;
					break;
				}
				onPlatform = true;
			}
		}
		if (!onPlatform) {
			self.direction *= -1;
		}
	};
	self.defeat = function () {
		self.alive = false;
		LK.getSound('enemyHit').play();
		LK.setScore(LK.getScore() + 100);
		updateScoreDisplay();
		tween(self, {
			alpha: 0,
			scaleX: 0,
			scaleY: 0
		}, {
			duration: 300,
			onFinish: function onFinish() {
				self.destroy();
			}
		});
	};
	return self;
});
var Goal = Container.expand(function () {
	var self = Container.call(this);
	var goalGraphics = self.attachAsset('goal', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.reached = false;
	self.reachGoal = function () {
		if (!self.reached) {
			self.reached = true;
			LK.setScore(LK.getScore() + 1000);
			updateScoreDisplay();
			LK.showYouWin();
		}
	};
	return self;
});
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.velocityX = 0;
	self.velocityY = 0;
	self.onGround = false;
	self.speed = 8;
	self.jumpPower = -30;
	self.gravity = 0.8;
	self.maxFallSpeed = 50;
	self.lives = 3;
	self.invulnerable = false;
	self.invulnerableTime = 0;
	self.update = function () {
		// Apply gravity
		if (self.onGround === false) {
			self.velocityY += self.gravity;
			if (self.velocityY > self.maxFallSpeed) {
				self.velocityY = self.maxFallSpeed;
			}
		}
		// Apply velocities
		self.x += self.velocityX;
		self.y += self.velocityY;
		// Handle invulnerability
		if (self.invulnerable) {
			self.invulnerableTime--;
			heroGraphics.alpha = Math.sin(self.invulnerableTime * 0.3) * 0.5 + 0.5;
			if (self.invulnerableTime <= 0) {
				self.invulnerable = false;
				heroGraphics.alpha = 1;
			}
		}
		// Reset ground state
		self.onGround = false;
		// Friction
		self.velocityX *= 0.85;
	};
	self.jump = function () {
		if (self.onGround === true) {
			self.velocityY = self.jumpPower;
			self.onGround = false;
		}
	};
	self.moveLeft = function () {
		self.velocityX = -self.speed;
	};
	self.moveRight = function () {
		self.velocityX = self.speed;
	};
	self.takeDamage = function () {
		if (!self.invulnerable) {
			self.lives--;
			self.invulnerable = true;
			self.invulnerableTime = 120;
			LK.effects.flashScreen(0xff0000, 500);
			updateLivesDisplay();
			if (self.lives <= 0) {
				LK.showGameOver();
			}
		}
	};
	return self;
});
var Platform = Container.expand(function (width, height) {
	var self = Container.call(this);
	var platformGraphics = self.attachAsset('platform', {
		anchorX: 0,
		anchorY: 0,
		width: width || 300,
		height: height || 40
	});
	self.platformWidth = width || 300;
	self.platformHeight = height || 40;
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb
});

/**** 
* Game Code
****/ 
var hero;
var platforms = [];
var enemies = [];
var coins = [];
var goal;
var camera = {
	x: 0,
	y: 0
};
var levelWidth = 4000;
var coinsCollected = 0;
var totalCoins = 0;
// Button controls only
var leftPressed = false;
var rightPressed = false;
// UI Elements
var scoreText = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0, 0);
LK.gui.topLeft.addChild(scoreText);
scoreText.x = 120;
scoreText.y = 20;
var livesText = new Text2('Lives: 3', {
	size: 60,
	fill: 0xFFFFFF
});
livesText.anchor.set(1, 0);
LK.gui.topRight.addChild(livesText);
var coinText = new Text2('Coins: 0/0', {
	size: 50,
	fill: 0xFFFF00
});
coinText.anchor.set(0.5, 0);
LK.gui.top.addChild(coinText);
// Control buttons
var leftButton = new Text2('◀', {
	size: 120,
	fill: 0xFFFFFF
});
leftButton.anchor.set(0.5, 0.5);
LK.gui.bottomLeft.addChild(leftButton);
leftButton.x = 100;
leftButton.y = -150;
var rightButton = new Text2('▶', {
	size: 120,
	fill: 0xFFFFFF
});
rightButton.anchor.set(0.5, 0.5);
LK.gui.bottomRight.addChild(rightButton);
rightButton.x = -100;
rightButton.y = -150;
var jumpButton = new Text2('⬆', {
	size: 200,
	fill: 0xFFFFFF
});
jumpButton.anchor.set(0.5, 0.5);
LK.gui.bottomRight.addChild(jumpButton);
jumpButton.x = -100;
jumpButton.y = -300;
// Swipe detection variables
var swipeStartY = 0;
var swipeStartTime = 0;
var isSwipeActive = false;
var swipeThreshold = 100; // Minimum distance for swipe
var swipeTimeLimit = 500; // Maximum time for swipe in milliseconds
function updateScoreDisplay() {
	scoreText.setText('Score: ' + LK.getScore());
}
function updateLivesDisplay() {
	livesText.setText('Lives: ' + hero.lives);
}
function updateCoinDisplay() {
	coinText.setText('Coins: ' + coinsCollected + '/' + totalCoins);
}
function createLevel() {
	// Create hero
	hero = game.addChild(new Hero());
	hero.x = 200;
	hero.y = 600;
	// Create platforms
	var platformData = [{
		x: 0,
		y: 650,
		width: 400,
		height: 40
	}, {
		x: 600,
		y: 550,
		width: 300,
		height: 40
	}, {
		x: 1100,
		y: 450,
		width: 250,
		height: 40
	}, {
		x: 1500,
		y: 350,
		width: 200,
		height: 40
	}, {
		x: 1900,
		y: 450,
		width: 300,
		height: 40
	}, {
		x: 2400,
		y: 550,
		width: 250,
		height: 40
	}, {
		x: 2900,
		y: 350,
		width: 200,
		height: 40
	}, {
		x: 3300,
		y: 250,
		width: 300,
		height: 40
	}, {
		x: 3800,
		y: 350,
		width: 200,
		height: 40
	}, {
		x: 0,
		y: 700,
		width: levelWidth,
		height: 100
	} // Ground
	];
	for (var i = 0; i < platformData.length; i++) {
		var data = platformData[i];
		var platform = game.addChild(new Platform(data.width, data.height));
		platform.x = data.x;
		platform.y = data.y;
		platforms.push(platform);
	}
	// Create enemies
	var enemyPositions = [{
		x: 700,
		y: 550
	}, {
		x: 1200,
		y: 450
	}, {
		x: 2000,
		y: 450
	}, {
		x: 2500,
		y: 550
	}, {
		x: 3400,
		y: 250
	}];
	for (var j = 0; j < enemyPositions.length; j++) {
		var enemyPos = enemyPositions[j];
		var enemy = game.addChild(new Enemy());
		enemy.x = enemyPos.x;
		enemy.y = enemyPos.y;
		enemies.push(enemy);
	}
	// Create coins
	var coinPositions = [{
		x: 750,
		y: 500
	}, {
		x: 1200,
		y: 400
	}, {
		x: 1600,
		y: 300
	}, {
		x: 2050,
		y: 400
	}, {
		x: 2550,
		y: 500
	}, {
		x: 3050,
		y: 300
	}, {
		x: 3450,
		y: 200
	}, {
		x: 3900,
		y: 300
	}];
	totalCoins = coinPositions.length;
	updateCoinDisplay();
	for (var k = 0; k < coinPositions.length; k++) {
		var coinPos = coinPositions[k];
		var coin = game.addChild(new Coin());
		coin.x = coinPos.x;
		coin.y = coinPos.y;
		coins.push(coin);
	}
	// Create goal
	goal = game.addChild(new Goal());
	goal.x = 3900;
	goal.y = 350;
}
function checkPlatformCollisions() {
	for (var i = 0; i < platforms.length; i++) {
		var platform = platforms[i];
		// Define hero boundaries
		var heroLeft = hero.x - 40;
		var heroRight = hero.x + 40;
		var heroTop = hero.y - 80;
		var heroBottom = hero.y;
		var heroCenterX = hero.x;
		var heroCenterY = hero.y - 40;
		// Define platform boundaries
		var platformLeft = platform.x;
		var platformRight = platform.x + platform.platformWidth;
		var platformTop = platform.y;
		var platformBottom = platform.y + platform.platformHeight;
		// Check if hero is overlapping with platform
		var horizontalOverlap = heroRight > platformLeft && heroLeft < platformRight;
		var verticalOverlap = heroBottom > platformTop && heroTop < platformBottom;
		if (horizontalOverlap && verticalOverlap) {
			// Calculate overlap distances
			var overlapLeft = heroRight - platformLeft;
			var overlapRight = platformRight - heroLeft;
			var overlapTop = heroBottom - platformTop;
			var overlapBottom = platformBottom - heroTop;
			// Find minimum overlap to determine collision direction
			var minOverlap = Math.min(overlapLeft, overlapRight, overlapTop, overlapBottom);
			// Resolve collision based on minimum overlap
			if (minOverlap === overlapTop && hero.velocityY >= 0) {
				// Landing on top of platform
				hero.y = platformTop;
				hero.velocityY = 0;
				hero.onGround = true;
			} else if (minOverlap === overlapBottom && hero.velocityY < 0) {
				// Hitting platform from below
				hero.y = platformBottom + 80;
				hero.velocityY = 0;
			} else if (minOverlap === overlapLeft && hero.velocityX > 0) {
				// Hitting platform from left side
				hero.x = platformLeft - 40;
				hero.velocityX = 0;
			} else if (minOverlap === overlapRight && hero.velocityX < 0) {
				// Hitting platform from right side
				hero.x = platformRight + 40;
				hero.velocityX = 0;
			}
		}
	}
}
function checkEnemyCollisions() {
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		if (!enemy.alive) {
			continue;
		}
		if (hero.intersects(enemy)) {
			// Check if hero is jumping on enemy
			if (hero.velocityY > 0 && hero.y < enemy.y - 30) {
				enemy.defeat();
				enemies.splice(i, 1);
				hero.velocityY = -15; // Bounce
			} else {
				hero.takeDamage();
			}
		}
	}
}
function checkCoinCollisions() {
	for (var i = coins.length - 1; i >= 0; i--) {
		var coin = coins[i];
		if (!coin.collected && hero.intersects(coin)) {
			coin.collect();
			coins.splice(i, 1);
		}
	}
}
function checkGoalCollision() {
	if (!goal.reached && hero.intersects(goal)) {
		goal.reachGoal();
	}
}
function updateCamera() {
	camera.x = hero.x - 1024;
	camera.y = hero.y - 2200; // Zoom in so ground appears at bottom
	if (camera.x < 0) {
		camera.x = 0;
	}
	if (camera.x > levelWidth - 1048) {
		camera.x = levelWidth - 2048;
	}
	if (camera.y < -500) {
		camera.y = -500;
	}
	if (camera.y > 0) {
		camera.y = 0;
	}
	game.x = -camera.x;
	game.y = -camera.y;
}
function checkBounds() {
	// Check if hero fell off the world
	if (hero.y > 1000) {
		hero.takeDamage();
		hero.x = 200;
		hero.y = 600;
		hero.velocityX = 0;
		hero.velocityY = 0;
	}
}
// Button event handlers
leftButton.down = function (x, y, obj) {
	leftPressed = true;
};
leftButton.up = function (x, y, obj) {
	leftPressed = false;
};
rightButton.down = function (x, y, obj) {
	rightPressed = true;
};
rightButton.up = function (x, y, obj) {
	rightPressed = false;
};
// Jump button event handlers
jumpButton.down = function (x, y, obj) {
	if (hero && hero.onGround && jumpButton.interactive) {
		hero.jump();
	}
};
jumpButton.up = function (x, y, obj) {
	// No action needed on release
};
// Touch controls with swipe detection
game.down = function (x, y, obj) {
	// Start swipe detection
	swipeStartY = y;
	swipeStartTime = Date.now();
	isSwipeActive = true;
};
game.move = function (x, y, obj) {
	// Track swipe movement but don't perform action yet
};
game.up = function (x, y, obj) {
	if (isSwipeActive) {
		var swipeDistance = swipeStartY - y; // Positive if swiping up
		var swipeTime = Date.now() - swipeStartTime;
		// Check if this is an upward swipe
		if (swipeDistance > swipeThreshold && swipeTime < swipeTimeLimit) {
			// Trigger jump if hero is on ground
			if (hero && hero.onGround) {
				hero.jump();
			}
		}
	}
	isSwipeActive = false;
};
game.update = function () {
	// Handle continuous button presses
	if (leftPressed) {
		hero.moveLeft();
	}
	if (rightPressed) {
		hero.moveRight();
	}
	// Update jump button visual state and interactivity
	if (hero.onGround) {
		jumpButton.alpha = 1.0; // Fully visible when can jump
		jumpButton.tint = 0xFFFFFF; // White tint when available
		jumpButton.interactive = true; // Enable button interaction
	} else {
		jumpButton.alpha = 0.5; // Semi-transparent when cannot jump
		jumpButton.tint = 0x888888; // Gray tint when unavailable
		jumpButton.interactive = false; // Disable button interaction
	}
	// Jump is handled directly in jumpButton.down event
	checkPlatformCollisions();
	checkEnemyCollisions();
	checkCoinCollisions();
	checkGoalCollision();
	checkBounds();
	updateCamera();
};
// Initialize level
createLevel();

===================================================================
--- original.js
+++ change.js
@@ -404,33 +404,48 @@
 }
 function checkPlatformCollisions() {
 	for (var i = 0; i < platforms.length; i++) {
 		var platform = platforms[i];
-		// Check horizontal overlap first
-		if (hero.x + 40 > platform.x && hero.x - 40 < platform.x + platform.platformWidth) {
-			// Landing on top of platform - hero's bottom touching platform's top
-			if (hero.velocityY >= 0 && hero.y >= platform.y - 5 && hero.y <= platform.y + 20) {
-				hero.y = platform.y;
+		// Define hero boundaries
+		var heroLeft = hero.x - 40;
+		var heroRight = hero.x + 40;
+		var heroTop = hero.y - 80;
+		var heroBottom = hero.y;
+		var heroCenterX = hero.x;
+		var heroCenterY = hero.y - 40;
+		// Define platform boundaries
+		var platformLeft = platform.x;
+		var platformRight = platform.x + platform.platformWidth;
+		var platformTop = platform.y;
+		var platformBottom = platform.y + platform.platformHeight;
+		// Check if hero is overlapping with platform
+		var horizontalOverlap = heroRight > platformLeft && heroLeft < platformRight;
+		var verticalOverlap = heroBottom > platformTop && heroTop < platformBottom;
+		if (horizontalOverlap && verticalOverlap) {
+			// Calculate overlap distances
+			var overlapLeft = heroRight - platformLeft;
+			var overlapRight = platformRight - heroLeft;
+			var overlapTop = heroBottom - platformTop;
+			var overlapBottom = platformBottom - heroTop;
+			// Find minimum overlap to determine collision direction
+			var minOverlap = Math.min(overlapLeft, overlapRight, overlapTop, overlapBottom);
+			// Resolve collision based on minimum overlap
+			if (minOverlap === overlapTop && hero.velocityY >= 0) {
+				// Landing on top of platform
+				hero.y = platformTop;
 				hero.velocityY = 0;
 				hero.onGround = true;
-				return; // Exit early to prevent multiple collision checks
-			}
-			// Hitting platform from below - hero's top hitting platform's bottom
-			else if (hero.velocityY < 0 && hero.y - 80 <= platform.y + platform.platformHeight && hero.y - 80 >= platform.y + platform.platformHeight - 20) {
-				hero.y = platform.y + platform.platformHeight + 80;
+			} else if (minOverlap === overlapBottom && hero.velocityY < 0) {
+				// Hitting platform from below
+				hero.y = platformBottom + 80;
 				hero.velocityY = 0;
-			}
-		}
-		// Check vertical overlap for side collisions
-		if (hero.y > platform.y - 80 && hero.y < platform.y + platform.platformHeight) {
-			// Left side collision - hero moving right into platform's left side
-			if (hero.velocityX > 0 && hero.x + 40 >= platform.x && hero.x + 40 <= platform.x + 20) {
-				hero.x = platform.x - 40;
+			} else if (minOverlap === overlapLeft && hero.velocityX > 0) {
+				// Hitting platform from left side
+				hero.x = platformLeft - 40;
 				hero.velocityX = 0;
-			}
-			// Right side collision - hero moving left into platform's right side
-			else if (hero.velocityX < 0 && hero.x - 40 <= platform.x + platform.platformWidth && hero.x - 40 >= platform.x + platform.platformWidth - 20) {
-				hero.x = platform.x + platform.platformWidth + 40;
+			} else if (minOverlap === overlapRight && hero.velocityX < 0) {
+				// Hitting platform from right side
+				hero.x = platformRight + 40;
 				hero.velocityX = 0;
 			}
 		}
 	}