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

/**** 
* Classes
****/ 
// Enemy: Drone
var Drone = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('drone', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 1;
	self.shootCooldown = 0;
	self.update = function () {
		self.x -= 8;
	};
	return self;
});
// Enemy bullet
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGfx = self.attachAsset('bullet_enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -18;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
// Explosion effect
var Explosion = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('explosion', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 1
	});
	// Animate fade out
	tween(gfx, {
		alpha: 0
	}, {
		duration: 400,
		easing: tween.linear,
		onFinish: function onFinish() {
			self.destroy();
		}
	});
	return self;
});
// Squad member: Chapter2 J
var J = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('ch2', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 4;
	self.role = 'j';
	self.shootCooldown = 0;
	self.update = function () {};
	return self;
});
// Laser bullet for J
var LaserBullet = Container.expand(function () {
	var self = Container.call(this);
	var laserGfx = self.attachAsset('centerCircle', {
		anchorX: 0.5,
		anchorY: 0.5,
		width: 40,
		height: 12,
		color: 0xff00ff,
		shape: 'box'
	});
	self.speed = 32;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
// Squad member: Medic
var Medic = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('medic', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 3;
	self.role = 'medic';
	self.update = function () {};
	return self;
});
// Player bullet
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGfx = self.attachAsset('bullet_player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 32;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
// Powerup: Ammo
var PowerupAmmo = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('powerup_ammo', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		self.x -= 6;
	};
	return self;
});
// Powerup: Health
var PowerupHealth = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('powerup_health', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		self.x -= 6;
	};
	return self;
});
// Captain Rhea Morgan (player)
var Rhea = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('rhea', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 5;
	self.shootCooldown = 0;
	self.update = function () {};
	return self;
});
// Squad member: Chapter2 S
var S = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('s', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 4;
	self.role = 's';
	self.shootCooldown = 0;
	self.update = function () {};
	return self;
});
// Squad member: Sniper
var Sniper = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('sniper', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 2;
	self.role = 'sniper';
	self.shootCooldown = 0;
	self.update = function () {};
	return self;
});
// Enemy: Tank (mini-boss)
var Tank = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('tank', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 10;
	self.shootCooldown = 0;
	self.update = function () {
		self.x -= 4;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222831
});

/**** 
* Game Code
****/ 
// World War I background image
var battlefieldBg = LK.getAsset('ww1_bg', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0,
	width: 2048,
	height: 2732,
	alpha: 0.35
});
game.addChild(battlefieldBg);
// Track if chapter 2 background has been swapped
var chapter2BgSwapped = false;
// Play music
// Main character: Captain Rhea Morgan
// Squad member: Medic
// Squad member: Sniper
// Enemy: Drone
// Enemy: Tank
// Bullet: Player
// Bullet: Enemy
// Powerup: Health
// Powerup: Ammo
// Explosion effect
// Sound effects
// Music
LK.playMusic('battle_theme');
// Game state variables
var rhea, medic, sniper;
var squad = [];
var playerBullets = [];
var enemyBullets = [];
var enemies = [];
var powerups = [];
var explosions = [];
var score = 0;
var resources = 0;
var gameOver = false;
var youWin = false;
var dragNode = null;
var lastTouchX = 0,
	lastTouchY = 0;
// Used to pause enemy/powerup spawn at start of Chapter 2
var chapter2PauseTicks = 0;
// Track if chapter 2 has started
var chapter2Started = false;
// UI
var scoreTxt = new Text2('0', {
	size: 100,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var hpTxt = new Text2('HP: 5', {
	size: 70,
	fill: 0xFF5252
});
// Move HP text to the upper left, avoiding the top left 100x100 px reserved area
hpTxt.anchor.set(0, 0);
hpTxt.x = 110; // 10px right of reserved area
hpTxt.y = 10;
LK.gui.topLeft.addChild(hpTxt);
var resourceTxt = new Text2('Res: 0', {
	size: 70,
	fill: 0xFFD600
});
resourceTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(resourceTxt);
// Initialize player and squad
rhea = new Rhea();
rhea.x = 400;
rhea.y = 2732 / 2;
game.addChild(rhea);
medic = new Medic();
medic.x = rhea.x - 120;
medic.y = rhea.y + 120;
game.addChild(medic);
sniper = new Sniper();
sniper.x = rhea.x - 120;
sniper.y = rhea.y - 120;
game.addChild(sniper);
squad = [rhea, medic, sniper];
// Helper: spawn enemy
function spawnEnemy() {
	// Only spawn J and S as enemies in Chapter 2
	if (chapter2Started) {
		// Alternate between J and S
		var enemy;
		if (LK.ticks % 2 === 0) {
			enemy = new J();
			enemy.x = 2048 + 120;
			enemy.y = 300 + Math.floor(Math.random() * (2732 - 600));
			enemy.direction = -1;
			enemy.shootCooldown = 40;
			enemy.lastX = enemy.x;
		} else {
			enemy = new S();
			enemy.x = -120;
			enemy.y = 300 + Math.floor(Math.random() * (2732 - 600));
			enemy.direction = 1;
			enemy.lastX = enemy.x;
		}
		enemies.push(enemy);
		game.addChild(enemy);
	} else {
		var type = LK.ticks % 300 === 0 ? 'tank' : 'drone';
		var enemy;
		if (type === 'drone') {
			enemy = new Drone();
			enemy.x = 2048 + 60;
			enemy.y = 300 + Math.floor(Math.random() * (2732 - 600));
		} else {
			enemy = new Tank();
			enemy.x = 2048 + 120;
			enemy.y = 400 + Math.floor(Math.random() * (2732 - 800));
		}
		enemies.push(enemy);
		game.addChild(enemy);
	}
}
// Helper: spawn powerup
function spawnPowerup() {
	// In chapter 2, further increase chance of health powerup
	var healthChance = chapter2Started ? 0.92 : 0.5; // Increased to 92% in chapter 2
	var type = Math.random() < healthChance ? 'health' : 'ammo';
	var powerup;
	if (type === 'health') {
		powerup = new PowerupHealth();
	} else {
		powerup = new PowerupAmmo();
	}
	powerup.x = 2048 + 60;
	powerup.y = 300 + Math.floor(Math.random() * (2732 - 600));
	powerups.push(powerup);
	game.addChild(powerup);
}
// Helper: fire player bullet
function firePlayerBullet(from) {
	var bullet = new PlayerBullet();
	bullet.x = from.x + 70;
	bullet.y = from.y;
	// Stronger sniper: sniper bullets do more damage
	if (from.role === 'sniper') {
		bullet.damage = 6;
	} else {
		bullet.damage = 3;
	}
	playerBullets.push(bullet);
	game.addChild(bullet);
	LK.getSound('shoot_player').play();
}
// Helper: fire enemy bullet
function fireEnemyBullet(from) {
	var bullet = new EnemyBullet();
	bullet.x = from.x - 70;
	bullet.y = from.y;
	enemyBullets.push(bullet);
	game.addChild(bullet);
	LK.getSound('shoot_enemy').play();
}
// Helper: show explosion
function showExplosion(x, y) {
	var exp = new Explosion();
	exp.x = x;
	exp.y = y;
	explosions.push(exp);
	game.addChild(exp);
	LK.getSound('explosion').play();
}
// Helper: update UI
function updateUI() {
	scoreTxt.setText(score);
	hpTxt.setText('HP: ' + rhea.hp);
	resourceTxt.setText('Res: ' + resources);
}
// Handle dragging Rhea (player)
function handleMove(x, y, obj) {
	if (dragNode) {
		// Clamp to game area
		var minY = 120,
			maxY = 2732 - 120;
		dragNode.y = Math.max(minY, Math.min(maxY, y));
		lastTouchX = x;
		lastTouchY = y;
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	// Only allow dragging Rhea
	if (!gameOver && !youWin) {
		if (Math.abs(x - rhea.x) < 120 && Math.abs(y - rhea.y) < 120) {
			dragNode = rhea;
			handleMove(x, y, obj);
		}
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main game update loop
game.update = function () {
	if (gameOver || youWin) return;
	// Player auto-fire
	if (
	// Only allow auto-fire if not in chapter 2 pause, or if chapter 2 hasn't started yet, or if not in chapter 2
	!chapter2Started || typeof chapter2PauseTicks !== "undefined" && chapter2PauseTicks === 0) {
		if (rhea.shootCooldown > 0) rhea.shootCooldown--;
		if (rhea.shootCooldown === 0) {
			firePlayerBullet(rhea);
			rhea.shootCooldown = 10;
		}
		// Sniper auto-fire (slower)
		if (sniper.shootCooldown > 0) sniper.shootCooldown--;
		if (sniper.shootCooldown === 0) {
			firePlayerBullet(sniper);
			sniper.shootCooldown = 30;
		}
	}
	// Medic follows Rhea
	medic.x += (rhea.x - 120 - medic.x) * 0.15;
	medic.y += (rhea.y + 120 - medic.y) * 0.15;
	// Sniper follows Rhea
	sniper.x += (rhea.x - 120 - sniper.x) * 0.15;
	sniper.y += (rhea.y - 120 - sniper.y) * 0.15;
	// Spawn enemies
	if (typeof chapter2PauseTicks !== "undefined" && chapter2PauseTicks > 0) {
		chapter2PauseTicks--;
	} else {
		// Only spawn if not in chapter2 pause
		if (LK.ticks % 120 === 0) {
			spawnEnemy();
		}
		// Spawn powerups
		if (chapter2Started) {
			// In chapter 2, spawn powerups more often (every 90 ticks)
			if (LK.ticks % 90 === 0) {
				spawnPowerup();
			}
		} else {
			if (LK.ticks % 180 === 0) {
				spawnPowerup();
			}
		}
	}
	// Update player bullets
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var b = playerBullets[i];
		b.update();
		// Remove if off screen
		if (b.x > 2048 + 60) {
			b.destroy();
			playerBullets.splice(i, 1);
			continue;
		}
		// Hit enemy
		for (var j = enemies.length - 1; j >= 0; j--) {
			var e = enemies[j];
			if (b.intersects(e)) {
				var dmg = typeof b.damage === "number" ? b.damage : 3;
				e.hp -= dmg;
				showExplosion(b.x, b.y);
				b.destroy();
				playerBullets.splice(i, 1);
				if (e.hp <= 0) {
					showExplosion(e.x, e.y);
					score += e instanceof Tank ? 10 : 2;
					resources += e instanceof Tank ? 5 : 1;
					e.destroy();
					enemies.splice(j, 1);
				}
				updateUI();
				break;
			}
		}
	}
	// Update enemy bullets
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var b = enemyBullets[i];
		b.update();
		if (b.x < -60) {
			b.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
		// Hit squad
		for (var j = 0; j < squad.length; j++) {
			var s = squad[j];
			if (b.intersects(s)) {
				s.hp--;
				showExplosion(b.x, b.y);
				b.destroy();
				enemyBullets.splice(i, 1);
				if (s.hp <= 0) {
					showExplosion(s.x, s.y);
					if (s === rhea) {
						// Game over
						gameOver = true;
						LK.effects.flashScreen(0xff0000, 1000);
						LK.showGameOver();
						return;
					} else {
						s.destroy();
						squad.splice(j, 1);
					}
				}
				updateUI();
				break;
			}
		}
	}
	// Laser bullets from J
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var b = playerBullets[i];
		if (b instanceof LaserBullet) {
			b.update();
			// Remove if off screen
			if (b.x > 2048 + 60) {
				b.destroy();
				playerBullets.splice(i, 1);
				continue;
			}
			// Hit squad (including Rhea)
			for (var j = 0; j < squad.length; j++) {
				var s = squad[j];
				if (b.intersects(s)) {
					s.hp -= 2; // Laser does 2 damage
					showExplosion(b.x, b.y);
					b.destroy();
					playerBullets.splice(i, 1);
					if (s.hp <= 0) {
						showExplosion(s.x, s.y);
						if (s === rhea) {
							// Game over
							gameOver = true;
							LK.effects.flashScreen(0xff0000, 1000);
							LK.showGameOver();
							return;
						} else {
							s.destroy();
							squad.splice(j, 1);
						}
					}
					updateUI();
					break;
				}
			}
		}
	}
	// Update enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var e = enemies[i];
		// Special movement for J and S in chapter 2
		if (e.role === 'j' && chapter2Started) {
			// J moves left until near player, then stops
			if (typeof e.lastX === "undefined") e.lastX = e.x;
			if (e.x > rhea.x + 300) {
				e.x -= 12;
			}
			// J fires laser continuously at player from the beginning of chapter 2
			if (e.shootCooldown > 0) e.shootCooldown--;
			if (e.shootCooldown === 0) {
				// Always fire at Rhea's current position
				var laser = new LaserBullet();
				laser.x = e.x - 60;
				laser.y = e.y;
				// Calculate direction vector from J to Rhea
				var dx = rhea.x - e.x;
				var dy = rhea.y - e.y;
				var dist = Math.sqrt(dx * dx + dy * dy);
				if (dist === 0) dist = 1;
				laser.dirX = dx / dist;
				laser.dirY = dy / dist;
				laser.speed = 32;
				// Override update to move toward Rhea
				laser.update = function () {
					this.x += this.dirX * this.speed;
					this.y += this.dirY * this.speed;
				};
				playerBullets.push(laser);
				game.addChild(laser);
				e.shootCooldown = 18; // J fires every 18 ticks (slower fire rate)
			}
			e.lastX = e.x;
		} else if (e.role === 's' && chapter2Started) {
			// S moves right until near player, then stops
			if (typeof e.lastX === "undefined") e.lastX = e.x;
			if (e.x < rhea.x - 300) {
				e.x += 12;
			}
			e.lastX = e.x;
		} else {
			e.update();
		}
		// Remove if off screen
		if (e.role !== 'j' && e.role !== 's' && (e.x < -200 || e.x > 2048 + 200)) {
			e.destroy();
			enemies.splice(i, 1);
			continue;
		}
		// Enemy fire (for non-J/S enemies)
		if ((!e.role || e.role !== 'j' && e.role !== 's') && e.shootCooldown !== undefined) {
			if (e.shootCooldown > 0) e.shootCooldown--;
			if (e.shootCooldown === 0) {
				// Only fire if on screen
				if (e.x < 2048 && e.x > 0) {
					fireEnemyBullet(e);
					e.shootCooldown = e instanceof Tank ? 30 : 60;
				}
			}
		}
		// Collide with player
		if (e.intersects(rhea)) {
			rhea.hp -= 2;
			showExplosion(e.x, e.y);
			e.destroy();
			enemies.splice(i, 1);
			if (rhea.hp <= 0) {
				gameOver = true;
				LK.effects.flashScreen(0xff0000, 1000);
				LK.showGameOver();
				return;
			}
			updateUI();
		}
	}
	// Update powerups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var p = powerups[i];
		p.update();
		if (p.x < -60) {
			p.destroy();
			powerups.splice(i, 1);
			continue;
		}
		// Pickup by player
		if (p.intersects(rhea)) {
			if (p instanceof PowerupHealth) {
				rhea.hp = Math.min(rhea.hp + 2, 7);
			} else if (p instanceof PowerupAmmo) {
				// For MVP, just increase resources
				resources += 2;
			}
			LK.getSound('pickup').play();
			p.destroy();
			powerups.splice(i, 1);
			updateUI();
		}
	}
	// Chapter 2 trigger and Win condition
	if (typeof chapter2Started === "undefined") {
		chapter2Started = false;
	}
	if (!chapter2Started && score >= 30) {
		chapter2Started = true;
		// Swap background to bf2 for chapter 2
		if (!chapter2BgSwapped) {
			var bf2Bg = LK.getAsset('bf2', {
				anchorX: 0,
				anchorY: 0,
				x: 0,
				y: 0,
				width: 2048,
				height: 2732,
				alpha: 0.5
			});
			// Remove old background
			if (battlefieldBg && battlefieldBg.parent) {
				battlefieldBg.parent.removeChild(battlefieldBg);
			}
			game.addChildAt(bf2Bg, 0); // Add at bottom
			chapter2BgSwapped = true;
		}
		// Pause enemy and powerup spawning for a few seconds
		chapter2PauseTicks = 120; // 2 seconds at 60fps
		// Create a black overlay
		var chapter2Overlay = new Container();
		var blackBg = LK.getAsset('centerCircle', {
			width: 2048,
			height: 2732,
			color: 0x000000,
			shape: 'box',
			anchorX: 0,
			anchorY: 0,
			x: 0,
			y: 0,
			alpha: 1
		});
		chapter2Overlay.addChild(blackBg);
		// Show chapter 2 message
		var chapter2Txt = new Text2('Chapter 2: Firestorm Rising', {
			size: 120,
			fill: 0x00BFFF,
			font: "Impact, 'Arial Black', Tahoma"
		});
		chapter2Txt.anchor.set(0.5, 0.5);
		chapter2Txt.x = 2048 / 2;
		chapter2Txt.y = 2732 / 2;
		chapter2Overlay.addChild(chapter2Txt);
		game.addChild(chapter2Overlay);
		// Fade out the overlay and message after 2 seconds
		tween(chapter2Overlay, {
			alpha: 0
		}, {
			duration: 2000,
			easing: tween.linear,
			onFinish: function onFinish() {
				chapter2Overlay.destroy();
			}
		});
		// Remove all non-J/S enemies from the field at the start of Chapter 2
		for (var i = enemies.length - 1; i >= 0; i--) {
			var e = enemies[i];
			if (!(e.role === 'j' || e.role === 's')) {
				e.destroy();
				enemies.splice(i, 1);
			}
		}
		// Delay J and S squad member entry and attacks a few seconds after Chapter 2 starts
		// We'll use a timer to spawn J and S after a short delay
		if (typeof chapter2JSTimer !== "number") {
			// Set a timer to spawn J and S after 2.5 seconds (150 ticks at 60fps)
			chapter2JSTimer = 150;
			chapter2JSSpawned = false;
		}
		if (!chapter2JSSpawned && chapter2JSTimer > 0) {
			chapter2JSTimer--;
		}
		if (!chapter2JSSpawned && chapter2JSTimer === 0) {
			// Add new squad member for Chapter 2: J
			var j = new J();
			// J comes from the right side, moving left toward the player
			j.x = 2048 + 120;
			j.y = rhea.y + 60;
			j.direction = -1; // left
			j.shootCooldown = 60; // Wait a bit before first attack
			j.lastX = j.x;
			game.addChild(j);
			squad.push(j);
			enemies.push(j);
			chapter2JSSpawned = true;
			// Set a timer for S to appear a few seconds later (e.g., 90 ticks = 1.5s)
			chapter2STimer = 90;
			chapter2SSpawned = false;
		}
		if (typeof chapter2STimer === "number" && !chapter2SSpawned) {
			chapter2STimer--;
			if (chapter2STimer === 0) {
				// Add new squad member for Chapter 2: S
				var s = new S();
				// S comes from the left side, moving right toward the player
				s.x = -120;
				s.y = rhea.y - 60;
				s.direction = 1; // right
				s.lastX = s.x;
				game.addChild(s);
				squad.push(s);
				enemies.push(s);
				chapter2SSpawned = true;
			}
		}
		// Optionally, increase difficulty or change enemy types here for chapter 2
	}
	// Win condition: score threshold
	if (score >= 50) {
		youWin = true;
		LK.effects.flashScreen(0x00ff00, 1000);
		// Show 'You are a Real Player' as a gesture
		var playerTxt = new Text2('You are a Real Player', {
			size: 140,
			fill: 0xFFD700,
			font: "Impact, 'Arial Black', Tahoma"
		});
		playerTxt.anchor.set(0.5, 0.5);
		playerTxt.x = 2048 / 2;
		playerTxt.y = 2732 / 2;
		game.addChild(playerTxt);
		LK.showYouWin();
		return;
	}
};
// Initial UI update
updateUI();

===================================================================
--- original.js
+++ change.js
@@ -55,9 +55,9 @@
 });
 // Squad member: Chapter2 J
 var J = Container.expand(function () {
 	var self = Container.call(this);
-	var gfx = self.attachAsset('j', {
+	var gfx = self.attachAsset('ch2', {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
 	self.hp = 4;