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

/**** 
* Classes
****/ 
// Background class for trees
var Background = Container.expand(function () {
	var self = Container.call(this);
	// Place fewer trees at new positions
	var treePositions = [
	// Top left
	{
		x: 300,
		y: 300
	},
	// Top right
	{
		x: 2048 - 300,
		y: 320
	},
	// Bottom left
	{
		x: 350,
		y: 2732 - 320
	},
	// Bottom right
	{
		x: 2048 - 350,
		y: 2732 - 300
	},
	// Center left
	{
		x: 500,
		y: 1366
	},
	// Center right
	{
		x: 2048 - 500,
		y: 1366
	},
	// Center
	{
		x: 1024,
		y: 900
	}, {
		x: 1024,
		y: 2000
	}];
	for (var i = 0; i < treePositions.length; ++i) {
		var pos = treePositions[i];
		var tree = self.attachAsset('Tree', {
			anchorX: 0.5,
			anchorY: 1,
			x: pos.x,
			y: pos.y + 110,
			scaleX: 1 + Math.random() * 0.2,
			scaleY: 1 + Math.random() * 0.2
		});
	}
	return self;
});
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var sprite = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = 20;
	self.speed = 48;
	self.dx = 0;
	self.dy = 0;
	self.owner = null; // 'player' or 'enemy'
	self.damage = 1;
	self.lifetime = 60; // frames
	self.age = 0;
	self.update = function () {
		self.x += self.dx;
		self.y += self.dy;
		self.age++;
	};
	return self;
});
// Cover class
var Cover = Container.expand(function () {
	var self = Container.call(this);
	var sprite = self.attachAsset('cover', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = 100;
	return self;
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var sprite = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Add gun sprite to enemy hand (pistol texture)
	var gun = self.attachAsset('pistol', {
		anchorX: 0.1,
		anchorY: 0.5,
		scaleX: 1.0,
		scaleY: 1.0
	});
	gun.y = 20; // offset to hand
	gun.x = 40; // offset to right hand
	self.radius = 60;
	self.speed = 10 + Math.random() * 4;
	self.maxHealth = 3;
	self.health = self.maxHealth;
	self.shootCooldown = 40 + Math.floor(Math.random() * 20);
	self.lastShotTick = -100;
	self.target = null;
	self.alive = true;
	self.aimError = 0.2 + Math.random() * 0.2; // radians
	self.takeDamage = function (amount) {
		if (!self.alive) return;
		self.health -= amount;
		LK.getSound('hit').play();
		if (self.health <= 0) {
			self.health = 0;
			self.die();
		}
	};
	self.die = function () {
		self.alive = false;
		LK.getSound('enemy_down').play();
		tween(self, {
			alpha: 0
		}, {
			duration: 400,
			onFinish: function onFinish() {
				self.visible = false;
			}
		});
	};
	self.update = function () {
		if (!self.alive) return;
		// Move towards player if not too close
		if (self.target && self.target.alive) {
			var dx = self.target.x - self.x;
			var dy = self.target.y - self.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist > 300) {
				var moveX = dx / dist * self.speed;
				var moveY = dy / dist * self.speed;
				// Check for cover collision
				var blocked = false;
				for (var i = 0; i < covers.length; ++i) {
					if (self.intersects(covers[i])) {
						blocked = true;
						break;
					}
				}
				if (!blocked) {
					self.x += moveX;
					self.y += moveY;
				}
			}
		}
		// Rotate gun towards player if alive
		if (self.target && self.target.alive) {
			var dxg = self.target.x - self.x;
			var dyg = self.target.y - self.y;
			gun.rotation = Math.atan2(dyg, dxg);
		}
	};
	return self;
});
// Health pickup class
var HealthPickup = Container.expand(function () {
	var self = Container.call(this);
	var sprite = self.attachAsset('health', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = 30;
	self.healAmount = 2;
	return self;
});
// Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	var sprite = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Add gun sprite (pistol texture)
	var gun = self.attachAsset('pistol', {
		anchorX: 0.1,
		// grip of gun at hand
		anchorY: 0.5,
		scaleX: 1.0,
		scaleY: 1.0
	});
	gun.y = 20; // offset to hand
	gun.x = 40; // offset to right hand
	self.radius = 60;
	self.speed = 18;
	self.maxHealth = 5;
	self.health = self.maxHealth;
	self.ammo = 6;
	self.maxAmmo = 6;
	self.reloadTime = 60; // frames
	self.reloadCounter = 0;
	self.isReloading = false;
	self.lastShotTick = -100;
	self.shootCooldown = 18; // frames
	self.alive = true;
	self.takeDamage = function (amount) {
		if (!self.alive) return;
		self.health -= amount;
		LK.getSound('hit').play();
		if (self.health <= 0) {
			self.health = 0;
			self.die();
		}
	};
	self.die = function () {
		self.alive = false;
		LK.getSound('player_down').play();
		tween(self, {
			alpha: 0
		}, {
			duration: 400,
			onFinish: function onFinish() {
				self.visible = false;
			}
		});
	};
	self.heal = function (amount) {
		self.health += amount;
		if (self.health > self.maxHealth) self.health = self.maxHealth;
	};
	self.reload = function () {
		if (self.isReloading || self.ammo === self.maxAmmo) return;
		self.isReloading = true;
		self.reloadCounter = self.reloadTime;
	};
	self.update = function () {
		if (!self.alive) return;
		if (self.isReloading) {
			self.reloadCounter--;
			if (self.reloadCounter <= 0) {
				self.ammo = self.maxAmmo;
				self.isReloading = false;
			}
		}
		// Rotate gun towards last aim/touch position
		var dx = 0,
			dy = 0;
		if (typeof lastTouchX !== "undefined" && typeof lastTouchY !== "undefined") {
			dx = lastTouchX - self.x;
			dy = lastTouchY - self.y;
		}
		gun.rotation = Math.atan2(dy, dx);
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x181c24
});

/**** 
* Game Code
****/ 
// Game state variables
// Player character: blue box
// Enemy: red box
// Bullet: yellow ellipse
// Cover: dark gray box
// Health pickup: green ellipse
// Sound for shooting
// Sound for pickup
// Sound for hit
// Sound for enemy down
// Sound for player down
var player;
var enemies = [];
var bullets = [];
var covers = [];
var healthPickups = [];
var round = 1;
var maxRounds = 10;
var enemyCount = 2;
var bulletDamage = 1; // Bullet damage, increases each round
var dragging = false;
var dragOffsetX = 0;
var dragOffsetY = 0;
var aimX = 0;
var aimY = 0;
var lastTouchX = 0;
var lastTouchY = 0;
var gameState = 'playing'; // 'playing', 'win', 'lose'
var roundResetTimer = 0;
// UI
var scoreTxt = new Text2('Round 1', {
	size: 90,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var healthTxt = new Text2('♥♥♥♥♥', {
	size: 80,
	fill: 0x3BE14D
});
healthTxt.anchor.set(0, 0);
LK.gui.topRight.addChild(healthTxt);
var ammoTxt = new Text2('Ammo: 6/6', {
	size: 80,
	fill: 0xFFE14D
});
ammoTxt.anchor.set(1, 0);
LK.gui.topLeft.addChild(ammoTxt);
// Helper: clamp
function clamp(val, min, max) {
	if (val < min) return min;
	if (val > max) return max;
	return val;
}
// Helper: reset round
function resetRound() {
	// Remove all objects
	for (var i = 0; i < enemies.length; ++i) enemies[i].destroy();
	for (var i = 0; i < bullets.length; ++i) bullets[i].destroy();
	for (var i = 0; i < healthPickups.length; ++i) healthPickups[i].destroy();
	enemies = [];
	bullets = [];
	healthPickups = [];
	// Reset player
	player.x = 2048 / 2;
	player.y = 2732 - 350;
	player.health = player.maxHealth;
	player.ammo = player.maxAmmo;
	player.isReloading = false;
	player.reloadCounter = 0;
	player.alive = true;
	player.alpha = 1;
	player.visible = true;
	// Spawn enemies
	for (var i = 0; i < enemyCount; ++i) {
		var e = new Enemy();
		// Place enemies at top of map, spread out
		e.x = 400 + i * 400 + Math.random() * 100;
		e.y = 400 + Math.random() * 100;
		e.target = player;
		enemies.push(e);
		game.addChild(e);
	}
	// Spawn health pickup
	if (round % 2 === 1) {
		var hp = new HealthPickup();
		hp.x = 2048 / 2;
		hp.y = 2732 / 2;
		healthPickups.push(hp);
		game.addChild(hp);
	}
	// Update UI
	scoreTxt.setText('Round ' + round);
	updateHealthUI();
	updateAmmoUI();
	gameState = 'playing';
}
// Helper: update health UI
function updateHealthUI() {
	var s = '';
	for (var i = 0; i < player.health; ++i) s += '♥';
	for (var i = player.health; i < player.maxHealth; ++i) s += '♡';
	healthTxt.setText(s);
}
// Helper: update ammo UI
function updateAmmoUI() {
	if (player.isReloading) {
		ammoTxt.setText('Reloading...');
	} else {
		ammoTxt.setText('Ammo: ' + player.ammo + '/' + player.maxAmmo);
	}
}
// Helper: spawn covers
function spawnCovers() {
	for (var i = 0; i < covers.length; ++i) covers[i].destroy();
	covers = [];
	// Place 3 covers
	var c1 = new Cover();
	c1.x = 2048 / 2;
	c1.y = 1200;
	covers.push(c1);
	game.addChild(c1);
	var c2 = new Cover();
	c2.x = 600;
	c2.y = 1800;
	covers.push(c2);
	game.addChild(c2);
	var c3 = new Cover();
	c3.x = 2048 - 600;
	c3.y = 1800;
	covers.push(c3);
	game.addChild(c3);
}
// Helper: check line of sight (simple, ignores covers for MVP)
function hasLineOfSight(ax, ay, bx, by) {
	// For MVP, always true
	return true;
}
// Helper: shoot bullet
function shootBullet(from, toX, toY, owner) {
	var b = new Bullet();
	b.x = from.x;
	b.y = from.y;
	var dx = toX - from.x;
	var dy = toY - from.y;
	var dist = Math.sqrt(dx * dx + dy * dy);
	b.dx = dx / dist * b.speed;
	b.dy = dy / dist * b.speed;
	b.owner = owner;
	b.rotation = Math.atan2(dy, dx);
	// Set bullet damage based on round
	b.damage = bulletDamage;
	bullets.push(b);
	game.addChild(b);
	LK.getSound('shoot').play();
}
// Helper: check collision (circle)
function circlesCollide(a, b) {
	var dx = a.x - b.x;
	var dy = a.y - b.y;
	var dist = Math.sqrt(dx * dx + dy * dy);
	return dist < a.radius + b.radius - 10;
}
// Add background texture behind all gameplay elements
var backgroundTexture = LK.getAsset('Background', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0,
	scaleX: 2048 / 1000,
	scaleY: 2732 / 1024
});
game.addChild(backgroundTexture);
// Add background with trees above the background texture
var background = new Background();
game.addChild(background);
// Initialize player
player = new Player();
player.x = 2048 / 2;
player.y = 2732 - 350;
game.addChild(player);
// Initialize covers
spawnCovers();
// Start first round
resetRound();
// Touch controls: drag to move, tap to shoot
game.down = function (x, y, obj) {
	if (gameState !== 'playing') return;
	// If touch is on player, start dragging
	var dx = x - player.x;
	var dy = y - player.y;
	if (dx * dx + dy * dy < player.radius * player.radius) {
		dragging = true;
		dragOffsetX = player.x - x;
		dragOffsetY = player.y - y;
	} else {
		// Else, shoot if possible
		if (!player.isReloading && player.ammo > 0 && player.alive) {
			var now = LK.ticks;
			if (now - player.lastShotTick >= player.shootCooldown) {
				shootBullet(player, x, y, 'player');
				player.ammo--;
				player.lastShotTick = now;
				updateAmmoUI();
				if (player.ammo === 0) {
					player.reload();
					updateAmmoUI();
				}
			}
		}
	}
	lastTouchX = x;
	lastTouchY = y;
};
game.move = function (x, y, obj) {
	if (gameState !== 'playing') return;
	if (dragging && player.alive) {
		// Move player, clamp to map
		var nx = clamp(x + dragOffsetX, player.radius, 2048 - player.radius);
		var ny = clamp(y + dragOffsetY, player.radius, 2732 - player.radius);
		// Prevent moving into covers
		var blocked = false;
		for (var i = 0; i < covers.length; ++i) {
			if (Math.abs(nx - covers[i].x) < player.radius + covers[i].radius - 30 && Math.abs(ny - covers[i].y) < player.radius + covers[i].radius - 30) {
				blocked = true;
				break;
			}
		}
		if (!blocked) {
			player.x = nx;
			player.y = ny;
		}
	}
	lastTouchX = x;
	lastTouchY = y;
};
game.up = function (x, y, obj) {
	dragging = false;
};
// Main update loop
game.update = function () {
	if (gameState === 'win' || gameState === 'lose') {
		roundResetTimer--;
		if (roundResetTimer <= 0) {
			if (gameState === 'win') {
				round++;
				bulletDamage += 0.5; // Increase bullet damage each round
				player.maxHealth += 1; // Increase player's maxHealth each round
				if (round > maxRounds) {
					LK.showYouWin();
					return;
				}
				enemyCount = Math.min(6, 2 + Math.floor(round / 2));
			}
			resetRound();
		}
		return;
	}
	// Update player
	player.update();
	// Update enemies
	for (var i = enemies.length - 1; i >= 0; --i) {
		var e = enemies[i];
		e.update();
		// Enemy shoot at player if in range and cooldown ready
		if (e.alive && player.alive) {
			var dx = player.x - e.x;
			var dy = player.y - e.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist < 1200 && hasLineOfSight(e.x, e.y, player.x, player.y)) {
				var now = LK.ticks;
				if (now - e.lastShotTick >= e.shootCooldown) {
					// Add aim error
					var angle = Math.atan2(dy, dx) + (Math.random() - 0.5) * e.aimError;
					var tx = e.x + Math.cos(angle) * 2000;
					var ty = e.y + Math.sin(angle) * 2000;
					shootBullet(e, tx, ty, 'enemy');
					e.lastShotTick = now;
				}
			}
		}
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; --i) {
		var b = bullets[i];
		b.update();
		// Remove if out of bounds or too old
		if (b.x < -100 || b.x > 2148 || b.y < -100 || b.y > 2832 || b.age > b.lifetime) {
			b.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with covers
		var hitCover = false;
		for (var j = 0; j < covers.length; ++j) {
			if (circlesCollide(b, covers[j])) {
				hitCover = true;
				break;
			}
		}
		if (hitCover) {
			b.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with enemies
		if (b.owner === 'player') {
			for (var j = 0; j < enemies.length; ++j) {
				var e = enemies[j];
				if (e.alive && circlesCollide(b, e)) {
					e.takeDamage(b.damage);
					b.destroy();
					bullets.splice(i, 1);
					break;
				}
			}
		}
		// Check collision with player
		if (b.owner === 'enemy' && player.alive && circlesCollide(b, player)) {
			player.takeDamage(b.damage);
			updateHealthUI();
			b.destroy();
			bullets.splice(i, 1);
			if (!player.alive) {
				gameState = 'lose';
				roundResetTimer = 90;
				LK.effects.flashScreen(0xff0000, 800);
				LK.showGameOver();
			}
			break;
		}
	}
	// Remove dead enemies
	for (var i = enemies.length - 1; i >= 0; --i) {
		if (!enemies[i].alive && enemies[i].alpha <= 0.01) {
			enemies[i].destroy();
			enemies.splice(i, 1);
		}
	}
	// Update health pickups
	for (var i = healthPickups.length - 1; i >= 0; --i) {
		var hp = healthPickups[i];
		if (player.alive && circlesCollide(player, hp)) {
			player.heal(hp.healAmount);
			updateHealthUI();
			LK.getSound('pickup').play();
			hp.destroy();
			healthPickups.splice(i, 1);
		}
	}
	// Win condition: all enemies dead
	var allDead = true;
	for (var i = 0; i < enemies.length; ++i) {
		if (enemies[i].alive) {
			allDead = false;
			break;
		}
	}
	if (allDead && gameState === 'playing') {
		gameState = 'win';
		roundResetTimer = 60;
		LK.effects.flashScreen(0x3be14d, 600);
	}
	// Update UI
	updateAmmoUI();
};
/* End of game code */

===================================================================
--- original.js
+++ change.js
@@ -273,19 +273,19 @@
 
 /**** 
 * Game Code
 ****/ 
-// Sound for player down
-// Sound for enemy down
-// Sound for hit
-// Sound for pickup
-// Sound for shooting
-// Health pickup: green ellipse
-// Cover: dark gray box
-// Bullet: yellow ellipse
-// Enemy: red box
-// Player character: blue box
 // Game state variables
+// Player character: blue box
+// Enemy: red box
+// Bullet: yellow ellipse
+// Cover: dark gray box
+// Health pickup: green ellipse
+// Sound for shooting
+// Sound for pickup
+// Sound for hit
+// Sound for enemy down
+// Sound for player down
 var player;
 var enemies = [];
 var bullets = [];
 var covers = [];
@@ -520,8 +520,9 @@
 		if (roundResetTimer <= 0) {
 			if (gameState === 'win') {
 				round++;
 				bulletDamage += 0.5; // Increase bullet damage each round
+				player.maxHealth += 1; // Increase player's maxHealth each round
 				if (round > maxRounds) {
 					LK.showYouWin();
 					return;
 				}