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

/**** 
* Classes
****/ 
// Define a class for flying bird enemies
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Apply a tint to make it look different from regular enemies
	birdGraphics.tint = 0x00FFFF;
	// Create a hitbox for the bird
	self.hitArea = new Rectangle(-30, -30, 60, 60);
	self.speed = 6;
	self.verticalSpeed = 0;
	self.amplitude = 100; // How high the bird flies up and down
	self.frequency = 0.05; // How fast the bird completes a wave cycle
	self.initialY = 0; // Will store the initial Y position
	self.time = 0; // Time counter for sine wave movement
	self.update = function () {
		// Store last position for collision detection
		if (self.lastX === undefined) {
			self.lastX = self.x;
			self.lastY = self.y;
			self.lastWasIntersecting = false;
		}
		// Check for collisions with other enemies
		var isColliding = false;
		for (var i = 0; i < enemies.length; i++) {
			var otherEnemy = enemies[i];
			// Skip if it's the same enemy
			if (otherEnemy === self) {
				continue;
			}
			// Check for intersection
			if (self.intersects(otherEnemy)) {
				isColliding = true;
				break;
			}
		}
		// Only move if not colliding with other enemies
		if (!isColliding) {
			// Move bird horizontally
			self.x -= self.speed;
			// Update time counter
			self.time += self.frequency;
			// Apply sine wave vertical movement
			self.y = self.initialY + Math.sin(self.time) * self.amplitude;
			// Rotate bird slightly to match flight direction
			self.rotation = Math.sin(self.time) * 0.2;
		}
		// Remove bird if it's off screen
		if (self.x < -50) {
			// Remove from enemies array when reaching the left side
			for (var i = 0; i < enemies.length; i++) {
				if (enemies[i] === self) {
					enemies.splice(i, 1);
					break;
				}
			}
			self.destroy();
		}
		// Update last positions
		self.lastX = self.x;
		self.lastY = self.y;
	};
	return self;
});
// Define a class for enemies
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Create a much smaller hitbox for the enemy (reduce the collision area)
	self.hitArea = new Rectangle(-30, -30, 60, 60);
	self.speed = 8;
	self.update = function () {
		// Store last position for collision detection
		if (self.lastX === undefined) {
			self.lastX = self.x;
			self.lastY = self.y;
			self.lastWasIntersecting = false;
		}
		// Check for collisions with other enemies
		var isColliding = false;
		for (var i = 0; i < enemies.length; i++) {
			var otherEnemy = enemies[i];
			// Skip if it's the same enemy
			if (otherEnemy === self) {
				continue;
			}
			// Check for intersection
			if (self.intersects(otherEnemy)) {
				isColliding = true;
				break;
			}
		}
		// Only move if not colliding with other enemies
		if (!isColliding) {
			self.x -= self.speed;
			// Make the enemy roll by rotating it in the opposite direction
			self.rotation -= 0.1;
		}
		if (self.x < -50) {
			// Remove from enemies array when reaching the left side
			for (var i = 0; i < enemies.length; i++) {
				if (enemies[i] === self) {
					enemies.splice(i, 1);
					break;
				}
			}
			self.destroy();
		}
		// Update last positions
		self.lastX = self.x;
		self.lastY = self.y;
	};
});
// Define a class for heart display
var Heart = Container.expand(function () {
	var self = Container.call(this);
	// Create a heart using the heart asset
	var heartShape = self.attachAsset('heart', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Animate heart slightly
	self.animate = function () {
		tween(self, {
			scaleX: 1.1,
			scaleY: 1.1
		}, {
			duration: 800,
			easing: tween.easeInOutQuad,
			onFinish: function onFinish() {
				tween(self, {
					scaleX: 1.0,
					scaleY: 1.0
				}, {
					duration: 800,
					easing: tween.easeInOutQuad,
					onFinish: self.animate
				});
			}
		});
	};
	return self;
});
//<Assets used in the game will automatically appear here>
// Define a class for the player character
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Create a smaller hitbox for the player to make collisions more precise
	self.hitArea = new Rectangle(-50, -30, 100, 60);
	self.speed = 5;
	self.jumpHeight = 40;
	self.isJumping = false;
	self.velocityY = 0;
	self.invulnerable = false;
	self.jumpsRemaining = 2; // Allow for double jump (initial + 1 more in air)
	self.update = function () {
		if (self.isJumping) {
			self.y += self.velocityY;
			self.velocityY += 0.9; // Gravity effect
			if (self.y >= 2732 / 2) {
				// Ground level
				self.y = 2732 / 2;
				self.isJumping = false;
				self.velocityY = 0;
				self.jumpsRemaining = 2; // Reset jumps when landing
				// Add landing animation - slight squash effect
				tween(self, {
					scaleX: 1.3,
					scaleY: 0.7
				}, {
					duration: 200,
					easing: tween.easeOutQuad,
					onFinish: function onFinish() {
						// Return to normal scale
						tween(self, {
							scaleX: 1.0,
							scaleY: 1.0
						}, {
							duration: 300,
							easing: tween.easeOutElastic
						});
					}
				});
			}
		}
	};
	self.jump = function () {
		// Allow jumping if either on ground or have jumps remaining
		if (!self.isJumping || self.jumpsRemaining > 0) {
			// If already jumping, this is a double jump
			if (self.isJumping) {
				self.jumpsRemaining--;
				// Second jump has significantly less height
				self.velocityY = -self.jumpHeight * 0.6;
			} else {
				// First jump
				self.isJumping = true;
				self.jumpsRemaining = 1; // One more jump available after initial jump
				self.velocityY = -self.jumpHeight;
			}
			// Add a jump animation - squash before stretching up
			tween(self, {
				scaleX: 1.2,
				scaleY: 0.8
			}, {
				duration: 150,
				easing: tween.easeOutQuad,
				onFinish: function onFinish() {
					// Stretch when jumping up
					tween(self, {
						scaleX: 0.9,
						scaleY: 1.3
					}, {
						duration: 300,
						easing: tween.easeOutQuad,
						onFinish: function onFinish() {
							// Return to normal scale gradually
							tween(self, {
								scaleX: 1.0,
								scaleY: 1.0
							}, {
								duration: 400,
								easing: tween.easeInOutQuad
							});
						}
					});
				}
			});
		}
	};
});
// Define a class for slow, big enemies
var SlowEnemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Make it slightly larger but smaller than before
	enemyGraphics.scale.set(1.8, 1.8);
	// Apply a reddish tint to make it look more threatening
	enemyGraphics.tint = 0xFF5555;
	// Create a hitbox that matches the new smaller size
	self.hitArea = new Rectangle(-55, -55, 110, 110);
	// Faster speed compared to previous value
	self.speed = 5;
	self.update = function () {
		// Store last position for collision detection
		if (self.lastX === undefined) {
			self.lastX = self.x;
			self.lastY = self.y;
			self.lastWasIntersecting = false;
		}
		// Check for collisions with other enemies
		var isColliding = false;
		for (var i = 0; i < enemies.length; i++) {
			var otherEnemy = enemies[i];
			// Skip if it's the same enemy
			if (otherEnemy === self) {
				continue;
			}
			// Check for intersection
			if (self.intersects(otherEnemy)) {
				isColliding = true;
				break;
			}
		}
		// Only move if not colliding with other enemies
		if (!isColliding) {
			// Move enemy slowly
			self.x -= self.speed;
			// Make the enemy roll but slower than regular enemies
			self.rotation -= 0.04;
		}
		// Remove if off screen
		if (self.x < -100) {
			// Remove from enemies array when reaching the left side
			for (var i = 0; i < enemies.length; i++) {
				if (enemies[i] === self) {
					enemies.splice(i, 1);
					break;
				}
			}
			self.destroy();
		}
		// Update last positions
		self.lastX = self.x;
		self.lastY = self.y;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Using same asset as enemy but will be tinted differently
var background = game.addChild(LK.getAsset('background', {
	anchorX: 0,
	anchorY: 0
}));
background.x = 0;
background.y = 0;
// Initialize player
var player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 / 2;
// Initialize enemies
var enemies = [];
var enemySpawnInterval = 100;
var enemySpawnCounter = 0;
// Create a new Text2 object to display the score
var scoreText = new Text2('0', {
	size: 100,
	fill: 0xFFFFFF
});
// Add instruction text
var instructionText = new Text2('Tap once to jump, tap again for double jump!', {
	size: 64,
	fill: 0xFFFFFF
});
LK.gui.bottom.addChild(instructionText);
instructionText.x = 2048 / 2;
instructionText.y = -100;
instructionText.anchor.set(0.5, 0.5);
// Fade out instruction after 5 seconds
LK.setTimeout(function () {
	tween(instructionText, {
		alpha: 0
	}, {
		duration: 1000,
		easing: tween.easeInCubic
	});
}, 5000);
// Add the score text to the game GUI at the top center of the screen
LK.gui.top.addChild(scoreText);
scoreText.x = 2048 / 2;
scoreText.y = 0;
// Initialize lives counter
var lives = 3;
var hearts = [];
var heartsContainer = new Container();
game.addChild(heartsContainer);
// Position hearts container in the middle of the screen
heartsContainer.x = 2048 / 2;
heartsContainer.y = 150;
// Create heart display
function updateHeartDisplay() {
	// Clear existing hearts
	while (hearts.length > 0) {
		var heart = hearts.pop();
		heart.destroy();
	}
	// Create new hearts based on current lives
	for (var i = 0; i < lives; i++) {
		var heart = new Heart();
		heart.x = (i - (lives - 1) / 2) * 100; // Distribute hearts evenly
		heart.y = 0;
		hearts.push(heart);
		heartsContainer.addChild(heart);
		heart.animate();
	}
}
// Initial heart display
updateHeartDisplay();
// Play epic background music with fade-in effect
LK.playMusic('epicMusic', {
	fade: {
		start: 0,
		end: 0.8,
		duration: 2000
	}
});
// Add listener for game reset to restart music
LK.on('gameReset', function () {
	// Restart the music when game resets from the beginning (second 0)
	LK.stopMusic(); // Stop current music to ensure we start from the beginning
	LK.playMusic('epicMusic', {
		loop: true,
		fade: {
			start: 0,
			end: 0.8,
			duration: 2000
		}
	});
});
// Handle game updates
game.update = function () {
	player.update();
	// Spawn enemies
	enemySpawnCounter++;
	if (enemySpawnCounter >= enemySpawnInterval) {
		// Randomly decide between regular enemy, slow big enemy, or bird
		var spawnChance = Math.random();
		if (spawnChance < 0.5) {
			// 50% chance for regular enemy
			var enemy = new Enemy();
			enemy.x = 2048;
			enemy.y = 2732 / 2;
			enemies.push(enemy);
			game.addChild(enemy);
			// Apply rolling animation with tween in the opposite direction
			tween(enemy, {
				rotation: -Math.PI * 4
			}, {
				duration: 2000,
				easing: tween.linear,
				onFinish: function onFinish() {
					// Continuously roll the enemy in the opposite direction
					tween(enemy, {
						rotation: enemy.rotation - Math.PI * 4
					}, {
						duration: 2000,
						easing: tween.linear
					});
				}
			});
		} else if (spawnChance < 0.8) {
			// 30% chance for bird
			var bird = new Bird();
			bird.x = 2048;
			bird.y = Math.random() * (2732 / 2 - 400) + 400; // Random position between 400 and half the screen height
			bird.initialY = bird.y; // Set the initial Y position for the sine wave
			enemies.push(bird);
			game.addChild(bird);
			// Apply flapping wing animation
			tween(bird, {
				scaleY: 0.85
			}, {
				duration: 300,
				easing: tween.easeInOutQuad,
				onFinish: function onFinish() {
					// Flap wings function that will call itself repeatedly
					function flapWings() {
						tween(bird, {
							scaleY: 1.15
						}, {
							duration: 300,
							easing: tween.easeInOutQuad,
							onFinish: function onFinish() {
								tween(bird, {
									scaleY: 0.85
								}, {
									duration: 300,
									easing: tween.easeInOutQuad,
									onFinish: flapWings
								});
							}
						});
					}
					flapWings();
				}
			});
		} else {
			// 20% chance for slow, big enemy
			var slowEnemy = new SlowEnemy();
			slowEnemy.x = 2048;
			slowEnemy.y = 2732 / 2;
			enemies.push(slowEnemy);
			game.addChild(slowEnemy);
			// Apply slow stomping animation
			tween(slowEnemy, {
				rotation: -Math.PI * 2
			}, {
				duration: 4000,
				easing: tween.linear,
				onFinish: function onFinish() {
					// Continuously roll the enemy in the opposite direction but slower
					tween(slowEnemy, {
						rotation: slowEnemy.rotation - Math.PI * 2
					}, {
						duration: 4000,
						easing: tween.linear
					});
				}
			});
		}
		// Randomize the spawn interval for the next enemy
		enemySpawnInterval = Math.floor(Math.random() * 150) + 50;
		enemySpawnCounter = 0;
	}
	// Update enemies
	for (var j = enemies.length - 1; j >= 0; j--) {
		if (enemies[j]) {
			// Check if enemy exists before accessing
			enemies[j].update();
			if (player.intersects(enemies[j]) && !player.invulnerable) {
				// Handle collision
				lives--;
				updateHeartDisplay();
				// Make player invulnerable temporarily
				player.invulnerable = true;
				player.alpha = 0.5;
				// Flash the screen red
				LK.effects.flashScreen(0xff0000, 500);
				// Remove the enemy
				enemies[j].destroy();
				enemies.splice(j, 1);
				// Check if player has run out of lives
				if (lives <= 0) {
					LK.showGameOver();
				} else {
					// Make player vulnerable again after a short time
					LK.setTimeout(function () {
						player.invulnerable = false;
						player.alpha = 1;
					}, 1500);
				}
			} else if (player.x > enemies[j].x && !enemies[j].passed) {
				enemies[j].passed = true;
				LK.setScore(LK.getScore() + 1);
				scoreText.setText(LK.getScore());
			}
		} // Close the enemy existence check
	}
};
// Handle player jump
game.down = function (x, y, obj) {
	player.jump();
};
// Import tween plugin for animations

===================================================================
--- original.js
+++ change.js
@@ -503,36 +503,39 @@
 		enemySpawnCounter = 0;
 	}
 	// Update enemies
 	for (var j = enemies.length - 1; j >= 0; j--) {
-		enemies[j].update();
-		if (player.intersects(enemies[j]) && !player.invulnerable) {
-			// Handle collision
-			lives--;
-			updateHeartDisplay();
-			// Make player invulnerable temporarily
-			player.invulnerable = true;
-			player.alpha = 0.5;
-			// Flash the screen red
-			LK.effects.flashScreen(0xff0000, 500);
-			// Remove the enemy
-			enemies[j].destroy();
-			enemies.splice(j, 1);
-			// Check if player has run out of lives
-			if (lives <= 0) {
-				LK.showGameOver();
-			} else {
-				// Make player vulnerable again after a short time
-				LK.setTimeout(function () {
-					player.invulnerable = false;
-					player.alpha = 1;
-				}, 1500);
+		if (enemies[j]) {
+			// Check if enemy exists before accessing
+			enemies[j].update();
+			if (player.intersects(enemies[j]) && !player.invulnerable) {
+				// Handle collision
+				lives--;
+				updateHeartDisplay();
+				// Make player invulnerable temporarily
+				player.invulnerable = true;
+				player.alpha = 0.5;
+				// Flash the screen red
+				LK.effects.flashScreen(0xff0000, 500);
+				// Remove the enemy
+				enemies[j].destroy();
+				enemies.splice(j, 1);
+				// Check if player has run out of lives
+				if (lives <= 0) {
+					LK.showGameOver();
+				} else {
+					// Make player vulnerable again after a short time
+					LK.setTimeout(function () {
+						player.invulnerable = false;
+						player.alpha = 1;
+					}, 1500);
+				}
+			} else if (player.x > enemies[j].x && !enemies[j].passed) {
+				enemies[j].passed = true;
+				LK.setScore(LK.getScore() + 1);
+				scoreText.setText(LK.getScore());
 			}
-		} else if (player.x > enemies[j].x && !enemies[j].passed) {
-			enemies[j].passed = true;
-			LK.setScore(LK.getScore() + 1);
-			scoreText.setText(LK.getScore());
-		}
+		} // Close the enemy existence check
 	}
 };
 // Handle player jump
 game.down = function (x, y, obj) {