/**** 
* 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;
		}
		// 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) {
			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 () {
		self.x -= self.speed;
		// Make the enemy roll by rotating it in the opposite direction
		self.rotation -= 0.1;
		if (self.x < -50) {
			self.destroy();
		}
	};
});
// 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.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;
				// 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 () {
		if (!self.isJumping) {
			self.isJumping = true;
			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
							});
						}
					});
				}
			});
		}
	};
});

/**** 
* 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 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 whether to spawn a regular enemy or a bird (30% chance for bird)
		if (Math.random() < 0.7) {
			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 {
			// Spawn a bird at a random height
			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();
				}
			});
		}
		// 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--) {
		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());
		}
	}
};
// Handle player jump
game.down = function (x, y, obj) {
	player.jump();
};
// Import tween plugin for animations

===================================================================
--- original.js
+++ change.js
@@ -5,8 +5,50 @@
 
 /**** 
 * 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;
+		}
+		// 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) {
+			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', {
@@ -145,8 +187,9 @@
 
 /**** 
 * Game Code
 ****/ 
+// Using same asset as enemy but will be tinted differently
 var background = game.addChild(LK.getAsset('background', {
 	anchorX: 0,
 	anchorY: 0
 }));
@@ -222,40 +265,75 @@
 	player.update();
 	// Spawn enemies
 	enemySpawnCounter++;
 	if (enemySpawnCounter >= enemySpawnInterval) {
-		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
-				});
-			}
-		});
+		// Randomly decide whether to spawn a regular enemy or a bird (30% chance for bird)
+		if (Math.random() < 0.7) {
+			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 {
+			// Spawn a bird at a random height
+			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();
+				}
+			});
+		}
 		// 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--) {
 		enemies[j].update();
-		// Update player's Y position to match enemy's Y position
-		if (enemies.length > 0) {
-			player.y = enemies[j].y;
-		}
 		if (player.intersects(enemies[j]) && !player.invulnerable) {
 			// Handle collision
 			lives--;
 			updateHeartDisplay();