/**** 
* 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.bobOffset = Math.random() * Math.PI * 2;
	self.initialY = 0;
	self.update = function () {
		if (self.initialY === 0) {
			self.initialY = self.y;
		}
		// Bobbing animation
		self.y = self.initialY + Math.sin(LK.ticks * 0.1 + self.bobOffset) * 10;
		// Check collection by knight
		if (knight && self.intersects(knight)) {
			self.collect();
		}
	};
	self.collect = function () {
		LK.getSound('coinCollect').play();
		LK.setScore(LK.getScore() + 5);
		scoreText.setText('Score: ' + LK.getScore());
		// Remove from coins array
		for (var i = coins.length - 1; i >= 0; i--) {
			if (coins[i] === self) {
				coins.splice(i, 1);
				break;
			}
		}
		self.destroy();
	};
	return self;
});
// Game arrays to track objects
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.health = 100;
	self.maxHealth = 100;
	self.speed = 3;
	self.lastX = 0;
	self.update = function () {
		// Move directly toward the knight
		if (knight) {
			var dx = knight.x - self.x;
			var dy = knight.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				// Normalize direction and apply speed
				self.x += dx / distance * self.speed;
				self.y += dy / distance * self.speed;
			}
		} else {
			// Fallback: move down if knight doesn't exist
			self.y += self.speed;
		}
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		// Flash red when hit
		LK.effects.flashObject(self, 0xFF0000, 200);
		if (self.health <= 0) {
			self.die();
		}
	};
	self.die = function () {
		// Drop coin
		var coin = game.addChild(new Coin());
		coin.x = self.x;
		coin.y = self.y - 50;
		// Add experience to knight
		knight.gainExperience(25);
		// Remove from enemies array
		for (var i = enemies.length - 1; i >= 0; i--) {
			if (enemies[i] === self) {
				enemies.splice(i, 1);
				break;
			}
		}
		self.destroy();
		LK.setScore(LK.getScore() + 10);
		scoreText.setText('Score: ' + LK.getScore());
	};
	return self;
});
var Knight = Container.expand(function () {
	var self = Container.call(this);
	var knightGraphics = self.attachAsset('knight', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.attackCooldown = 0;
	self.level = 1;
	self.experience = 0;
	self.health = 100;
	self.maxHealth = 100;
	self.update = function () {
		if (self.attackCooldown > 0) {
			self.attackCooldown--;
		}
	};
	self.attack = function () {
		if (self.attackCooldown <= 0) {
			// Create sword swing effect
			var sword = game.addChild(LK.getAsset('sword', {
				anchorX: 0.5,
				anchorY: 1.0,
				x: self.x + 50,
				y: self.y - 60,
				rotation: Math.PI / 4
			}));
			// Animate sword swing
			tween(sword, {
				rotation: -Math.PI / 4
			}, {
				duration: 200,
				onFinish: function onFinish() {
					sword.destroy();
				}
			});
			self.attackCooldown = 30; // 0.5 seconds at 60fps
			LK.getSound('swordHit').play();
			return true;
		}
		return false;
	};
	self.gainExperience = function (amount) {
		self.experience += amount;
		var expNeeded = self.level * 100;
		if (self.experience >= expNeeded) {
			self.levelUp();
		}
	};
	self.levelUp = function () {
		self.level++;
		self.experience = 0;
		// Visual level up effect
		LK.effects.flashObject(self, 0xFFD700, 500);
		levelText.setText('Level: ' + self.level);
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			self.health = 0;
			// Game over when health reaches 0
			LK.effects.flashScreen(0xFF0000, 1000);
			LK.showGameOver();
		}
		// Update health bar
		updateHealthBar();
		// Flash red when hit
		LK.effects.flashObject(self, 0xFF0000, 200);
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2F4F2F // Dark forest green for medieval atmosphere
});

/**** 
* Game Code
****/ 
// Game arrays to track objects
var enemies = [];
var coins = [];
// Create castle background
var castle = game.addChild(LK.getAsset('castle', {
	anchorX: 0.5,
	anchorY: 1.0,
	x: 2048 / 2,
	y: 2732 - 200
}));
// Create knight
var knight = game.addChild(new Knight());
knight.x = 2048 / 2;
knight.y = 2732 - 250;
// UI Elements
var scoreText = new Text2('Score: 0', {
	size: 80,
	fill: 0xFFD700
});
scoreText.anchor.set(0, 0);
LK.gui.topRight.addChild(scoreText);
scoreText.x = -20;
scoreText.y = 20;
var levelText = new Text2('Level: 1', {
	size: 60,
	fill: 0xFFFFFF
});
levelText.anchor.set(0, 0);
LK.gui.topRight.addChild(levelText);
levelText.x = -20;
levelText.y = 110;
var tapText = new Text2('TAP TO ATTACK!', {
	size: 100,
	fill: 0xFF6B6B
});
tapText.anchor.set(0.5, 0.5);
LK.gui.center.addChild(tapText);
tapText.y = -200;
// Health bar UI
var healthBarBg = LK.getAsset('healthBarBg', {
	anchorX: 0,
	anchorY: 0
});
LK.gui.topLeft.addChild(healthBarBg);
healthBarBg.x = 120;
healthBarBg.y = 20;
var healthBar = LK.getAsset('healthBar', {
	anchorX: 0,
	anchorY: 0
});
LK.gui.topLeft.addChild(healthBar);
healthBar.x = 120;
healthBar.y = 20;
var healthText = new Text2('Health: 100/100', {
	size: 50,
	fill: 0xFFFFFF
});
healthText.anchor.set(0, 0);
LK.gui.topLeft.addChild(healthText);
healthText.x = 120;
healthText.y = 50;
function updateHealthBar() {
	var healthPercent = knight.health / knight.maxHealth;
	healthBar.scaleX = healthPercent;
	healthText.setText('Health: ' + knight.health + '/' + knight.maxHealth);
	// Change color based on health
	if (healthPercent > 0.6) {
		healthBar.tint = 0x00ff00; // Green
	} else if (healthPercent > 0.3) {
		healthBar.tint = 0xffff00; // Yellow
	} else {
		healthBar.tint = 0xff0000; // Red
	}
}
// Enemy spawning variables
var enemySpawnTimer = 0;
var enemySpawnRate = 60; // 1 second at 60fps
// Game input handling
game.down = function (x, y, obj) {
	// Knight attacks when player taps
	knight.attack();
	// Check if attack hits any enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		var distance = Math.abs(enemy.x - knight.x);
		if (distance < 100) {
			// Attack range
			enemy.takeDamage(50);
		}
	}
};
// Main game update loop
game.update = function () {
	// Spawn enemies
	enemySpawnTimer++;
	if (enemySpawnTimer >= enemySpawnRate) {
		enemySpawnTimer = 0;
		var enemy = game.addChild(new Enemy());
		enemy.x = Math.random() * 2048; // Random x position across screen width
		enemy.y = -100; // Spawn from top of screen
		enemy.lastX = enemy.x;
		enemies.push(enemy);
		// Increase difficulty over time
		if (enemySpawnRate > 30) {
			enemySpawnRate -= 2;
		}
	}
	// Check enemy-knight collisions and cleanup off-screen enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		// Remove enemies that went off-screen at bottom
		if (enemy.y > 2732 + 100) {
			enemies.splice(i, 1);
			enemy.destroy();
			continue;
		}
		// Initialize lastIntersecting if not set
		if (enemy.lastIntersecting === undefined) {
			enemy.lastIntersecting = false;
		}
		// Check for collision transition
		var currentIntersecting = enemy.intersects(knight);
		if (!enemy.lastIntersecting && currentIntersecting) {
			// Damage knight when enemy touches for the first time
			knight.takeDamage(20);
			// Remove enemy after dealing damage
			enemies.splice(i, 1);
			enemy.destroy();
			continue;
		}
		// Update last intersecting state
		enemy.lastIntersecting = currentIntersecting;
	}
	// Make tap text pulse
	var pulse = 1 + Math.sin(LK.ticks * 0.1) * 0.2;
	tapText.scale.set(pulse, pulse);
};
// Start medieval music
LK.playMusic('medievalTheme');

===================================================================
--- original.js
+++ change.js
@@ -103,8 +103,10 @@
 	});
 	self.attackCooldown = 0;
 	self.level = 1;
 	self.experience = 0;
+	self.health = 100;
+	self.maxHealth = 100;
 	self.update = function () {
 		if (self.attackCooldown > 0) {
 			self.attackCooldown--;
 		}
@@ -147,8 +149,21 @@
 		// Visual level up effect
 		LK.effects.flashObject(self, 0xFFD700, 500);
 		levelText.setText('Level: ' + self.level);
 	};
+	self.takeDamage = function (damage) {
+		self.health -= damage;
+		if (self.health <= 0) {
+			self.health = 0;
+			// Game over when health reaches 0
+			LK.effects.flashScreen(0xFF0000, 1000);
+			LK.showGameOver();
+		}
+		// Update health bar
+		updateHealthBar();
+		// Flash red when hit
+		LK.effects.flashObject(self, 0xFF0000, 200);
+	};
 	return self;
 });
 
 /**** 
@@ -198,8 +213,44 @@
 });
 tapText.anchor.set(0.5, 0.5);
 LK.gui.center.addChild(tapText);
 tapText.y = -200;
+// Health bar UI
+var healthBarBg = LK.getAsset('healthBarBg', {
+	anchorX: 0,
+	anchorY: 0
+});
+LK.gui.topLeft.addChild(healthBarBg);
+healthBarBg.x = 120;
+healthBarBg.y = 20;
+var healthBar = LK.getAsset('healthBar', {
+	anchorX: 0,
+	anchorY: 0
+});
+LK.gui.topLeft.addChild(healthBar);
+healthBar.x = 120;
+healthBar.y = 20;
+var healthText = new Text2('Health: 100/100', {
+	size: 50,
+	fill: 0xFFFFFF
+});
+healthText.anchor.set(0, 0);
+LK.gui.topLeft.addChild(healthText);
+healthText.x = 120;
+healthText.y = 50;
+function updateHealthBar() {
+	var healthPercent = knight.health / knight.maxHealth;
+	healthBar.scaleX = healthPercent;
+	healthText.setText('Health: ' + knight.health + '/' + knight.maxHealth);
+	// Change color based on health
+	if (healthPercent > 0.6) {
+		healthBar.tint = 0x00ff00; // Green
+	} else if (healthPercent > 0.3) {
+		healthBar.tint = 0xffff00; // Yellow
+	} else {
+		healthBar.tint = 0xff0000; // Red
+	}
+}
 // Enemy spawning variables
 var enemySpawnTimer = 0;
 var enemySpawnRate = 60; // 1 second at 60fps
 // Game input handling
@@ -247,12 +298,14 @@
 		}
 		// Check for collision transition
 		var currentIntersecting = enemy.intersects(knight);
 		if (!enemy.lastIntersecting && currentIntersecting) {
-			// Game over when enemy touches knight for the first time
-			LK.effects.flashScreen(0xFF0000, 1000);
-			LK.showGameOver();
-			break;
+			// Damage knight when enemy touches for the first time
+			knight.takeDamage(20);
+			// Remove enemy after dealing damage
+			enemies.splice(i, 1);
+			enemy.destroy();
+			continue;
 		}
 		// Update last intersecting state
 		enemy.lastIntersecting = currentIntersecting;
 	}