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

/**** 
* Classes
****/ 
// Air Enemy Class (Snake Segment - Simplified for MVP)
var AirEnemy = Container.expand(function (startX, startY) {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('airEnemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = startX;
	self.y = startY;
	self.speedX = 4 + Math.random() * 2; // Horizontal speed
	self.amplitudeY = 100 + Math.random() * 100; // Vertical movement range
	self.frequencyY = 0.01 + Math.random() * 0.01; // Vertical movement speed
	self.fireRate = 150; // Ticks between shots
	self.fireCooldown = Math.random() * self.fireRate;
	self.update = function () {
		// Basic horizontal and sinusoidal vertical movement
		self.x -= self.speedX;
		self.y = startY + Math.sin(LK.ticks * self.frequencyY + startX) * self.amplitudeY; // Use startX for phase offset
		// Firing logic
		self.fireCooldown++;
		if (self.fireCooldown >= self.fireRate) {
			self.fireCooldown = 0;
			// Fire a single bullet straight left
			var bulletSpeed = 8;
			fireEnemyBullet(self.x, self.y, -bulletSpeed, 0); // vx = -speed, vy = 0
		}
		// Boundary check (simple respawn logic)
		if (self.x < -enemyGraphics.width) {
			self.x = 2048 + enemyGraphics.width; // Respawn on the right
			startY = Math.random() * (2732 - 400) + 200; // Random Y position
		}
	};
	return self;
});
// Boss Class (Basic structure for future)
var Boss = Container.expand(function () {
	var self = Container.call(this);
	var bossGraphics = self.attachAsset('boss', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = 2048 - 300; // Position on the right
	self.y = 2732 / 2; // Center vertically
	self.fireRate = 180; // Ticks between laser bursts
	self.fireCooldown = 0;
	self.health = 100; // Example health
	self.update = function () {
		// Add movement logic if needed
		self.fireCooldown++;
		if (self.fireCooldown >= self.fireRate) {
			self.fireCooldown = 0;
			fireBossLasers(self.x, self.y);
		}
	};
	return self;
});
// Boss Laser Class (Basic structure for future)
var BossLaser = Container.expand(function (startX, startY, vx, vy) {
	var self = Container.call(this);
	var laserGraphics = self.attachAsset('bossLaser', {
		anchorX: 0.5,
		anchorY: 0.5 // Anchor center
	});
	self.x = startX;
	self.y = startY;
	self.vx = vx;
	self.vy = vy;
	// Set rotation based on velocity direction
	self.rotation = Math.atan2(vy, vx) + Math.PI / 2; // Point laser in direction of travel (+90deg adjustment needed depending on asset orientation)
	self.update = function () {
		self.x += self.vx;
		self.y += self.vy;
	};
	return self;
});
// Bottom Mountain Obstacle Class
var BottomMountain = Container.expand(function () {
	var self = Container.call(this);
	var mountainGraphics = self.attachAsset('bottommountain', {
		anchorX: 0.5,
		anchorY: 0.75 // Anchor base at terrain edge
	});
	self.speed = 5; // Should match terrain speed
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});
// Enemy Bullet Class
var EnemyBullet = Container.expand(function (startX, startY, vx, vy) {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = startX;
	self.y = startY;
	self.vx = vx; // Horizontal velocity
	self.vy = vy; // Vertical velocity
	self.update = function () {
		self.x += self.vx;
		self.y += self.vy;
	};
	return self;
});
// Ground Enemy Class
var GroundEnemy = Container.expand(function (isTop) {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('groundEnemy', {
		anchorX: 0.5,
		anchorY: isTop ? 0 : 1 // Anchor base at terrain edge
	});
	self.isTop = isTop;
	self.speed = 5; // Should match terrain speed
	self.fireRate = 120; // Ticks between firing sequences (2 seconds)
	self.fireCooldown = Math.random() * self.fireRate; // Random initial delay
	self.shotsInBurst = 3;
	self.burstDelay = 10; // Ticks between shots in a burst
	self.update = function () {
		self.x -= self.speed;
		self.fireCooldown++;
		if (self.fireCooldown >= self.fireRate) {
			self.fireCooldown = 0; // Reset cooldown
			// Fire burst
			for (var i = 0; i < self.shotsInBurst; i++) {
				LK.setTimeout(function () {
					// Check if enemy still exists before firing
					if (!self.destroyed) {
						var bulletSpeed = 8;
						var vx = -bulletSpeed * 0.707; // Move left
						var vy = self.isTop ? bulletSpeed * 0.707 : -bulletSpeed * 0.707; // Move down if top, up if bottom
						fireEnemyBullet(self.x, self.y, vx, vy);
					}
				}, i * self.burstDelay);
			}
		}
	};
	return self;
});
// Player Bullet Class
var PlayerBullet = Container.expand(function (startX, startY) {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = startX;
	self.y = startY;
	self.speed = 20; // Moves to the right
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
// Terrain Segment Class
var TerrainSegment = Container.expand(function (isTop) {
	var self = Container.call(this);
	var terrainGraphics = self.attachAsset('terrain', {
		anchorX: 0,
		anchorY: isTop ? 0 : 1 // Anchor at top for top terrain, bottom for bottom terrain
	});
	self.isTop = isTop;
	self.speed = 5; // Horizontal scroll speed
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});
// Top Mountain Obstacle Class
var TopMountain = Container.expand(function () {
	var self = Container.call(this);
	var mountainGraphics = self.attachAsset('topmountain', {
		anchorX: 0.5,
		anchorY: 0.3 // Anchor base at terrain edge
	});
	self.speed = 5; // Should match terrain speed
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});
// Player UFO Class
var UFO = Container.expand(function () {
	var self = Container.call(this);
	var ufoGraphics = self.attachAsset('ufo', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10; // Movement speed multiplier, adjust as needed
	self.isDead = false;
	self.invincibleUntil = 0;
	// Keep UFO within game boundaries
	self.clampPosition = function () {
		var halfWidth = ufoGraphics.width / 2;
		var halfHeight = ufoGraphics.height / 2;
		if (self.x < halfWidth) {
			self.x = halfWidth;
		}
		if (self.x > 2048 - halfWidth) {
			self.x = 2048 - halfWidth;
		}
		if (self.y < halfHeight + 100) {
			self.y = halfHeight + 100;
		} // Avoid top-left menu area
		if (self.y > 2732 - halfHeight) {
			self.y = 2732 - halfHeight;
		}
		// Adjust based on terrain phase
		if (gamePhase === 0) {
			// Find the current terrain height at the UFO's x position (simplified)
			var terrainHeight = 200; // Assuming constant terrain height for now
			if (self.y < terrainHeight + halfHeight) {
				self.y = terrainHeight + halfHeight;
			}
			if (self.y > 2732 - terrainHeight - halfHeight) {
				self.y = 2732 - terrainHeight - halfHeight;
			}
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x101030 // Dark space blue background
});

/**** 
* Game Code
****/ 
// LK.init.image('mountain', {width:150, height:250, id:'6819884bc4a0c8bae9e84ae0'}) // Removed - Replaced by top/bottom mountains
// Minimalistic tween library which should be used for animations over time
// Boss Laser Beam
// Boss
// Air Enemy (Placeholder shape)
// Enemy Bullet
// Ground Enemy
// Mountain Obstacle (simplified)
// Ground/Ceiling
// Player UFO
// Initialize assets used in this game. Scale them according to what is needed for the game.
/**** 
* Assets
* Assets are automatically created and loaded either dynamically during gameplay
* or via static code analysis based on their usage in the code.
****/ 
// Game State
var gamePhase = 0; // 0: Terrain, 1: Space, 2: Boss
var phaseStartTime = LK.ticks;
var phaseDuration = 3600; // 1 minute (60 seconds * 60 fps = 3600 ticks)
var terrainSpeed = 5;
var scoreIncrementTimer = 0;
// Game Objects
var player = null;
var terrainSegmentsTop = [];
var terrainSegmentsBottom = [];
var mountains = [];
var groundEnemies = [];
var enemyBullets = [];
var airEnemies = []; // Simple air enemies for MVP phase 2
var boss = null;
var bossLasers = [];
var playerBullets = []; // Array for player bullets
// Player Control
var dragNode = null;
var playerFireRate = 15; // Ticks between shots (4 shots per second)
var playerFireCooldown = 0;
// Player Lives
var MAX_PLAYER_LIVES = 5;
var playerLives = MAX_PLAYER_LIVES;
var livesTxt;
// Score Display
var scoreTxt = new Text2('0', {
	size: 100,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt); // Position score at top center
// Helper function to create terrain segments
function createTerrainSegment(isTop, xPos) {
	var segment = new TerrainSegment(isTop);
	segment.x = xPos;
	segment.y = isTop ? 0 : 2732;
	segment.speed = terrainSpeed;
	game.addChild(segment);
	if (isTop) {
		terrainSegmentsTop.push(segment);
	} else {
		terrainSegmentsBottom.push(segment);
	}
	return segment;
}
// Helper function to spawn mountains on terrain
function spawnMountain(terrainSegment) {
	var mountain;
	if (terrainSegment.isTop) {
		mountain = new TopMountain();
	} else {
		mountain = new BottomMountain();
	}
	// Position relative to the terrain segment
	// Ensure we use the actual height of the terrain graphic for positioning
	var terrainGraphic = terrainSegment.children[0]; // Assuming the graphic is the first child
	mountain.x = terrainSegment.x + Math.random() * terrainGraphic.width;
	// Position based on whether it's a top or bottom mountain
	mountain.y = terrainSegment.isTop ? terrainGraphic.height : 2732 - terrainGraphic.height;
	mountain.speed = terrainSpeed;
	game.addChild(mountain);
	mountains.push(mountain);
}
// Helper function to spawn ground enemies on terrain
function spawnGroundEnemy(terrainSegment) {
	var enemy = new GroundEnemy(terrainSegment.isTop);
	// Position relative to the terrain segment
	// Ensure we use the actual height of the terrain graphic for positioning
	var terrainGraphic = terrainSegment.children[0]; // Assuming the graphic is the first child
	enemy.x = terrainSegment.x + Math.random() * terrainGraphic.width;
	enemy.y = terrainSegment.isTop ? terrainGraphic.height : 2732 - terrainGraphic.height;
	enemy.speed = terrainSpeed;
	game.addChild(enemy);
	groundEnemies.push(enemy);
}
// Helper function to fire enemy bullets
function fireEnemyBullet(x, y, vx, vy) {
	var bullet = new EnemyBullet(x, y, vx, vy);
	game.addChild(bullet);
	enemyBullets.push(bullet);
	LK.getSound('enemyShoot').play();
}
// Helper function to spawn air enemies (simple version)
function spawnAirEnemy() {
	var startY = Math.random() * (2732 - 400) + 200; // Avoid edges
	var enemy = new AirEnemy(2048 + 100, startY); // Start off-screen right
	game.addChild(enemy);
	airEnemies.push(enemy);
}
// Helper function to fire boss lasers
function fireBossLasers(x, y) {
	var directions = 5;
	var laserSpeed = 12;
	var verticalSpread = 4; // Max vertical speed component
	for (var i = 0; i < directions; i++) {
		// Calculate vertical velocity component for spread
		// Example: i=0 -> -4, i=1 -> -2, i=2 -> 0, i=3 -> 2, i=4 -> 4
		var vy = -verticalSpread + verticalSpread * 2 / (directions - 1) * i;
		// Keep horizontal speed constant (moving left)
		var vx = -laserSpeed;
		var laser = new BossLaser(x, y, vx, vy);
		game.addChild(laser);
		bossLasers.push(laser);
	}
	// Add sound effect for laser fire (consider adding one e.g., LK.getSound('bossShoot').play(); if asset exists)
}
// Initialize Game Elements
function initGame() {
	// Reset state
	LK.setScore(0);
	scoreTxt.setText('0');
	// Initialize Lives
	playerLives = MAX_PLAYER_LIVES;
	if (!livesTxt) {
		// Create only if it doesn't exist (for game restarts)
		livesTxt = new Text2("Deaths: x" + playerLives, {
			size: 80,
			// Slightly smaller than score
			fill: 0xFFFFFF
		});
		livesTxt.anchor.set(1, 0); // Anchor top-right
		LK.gui.topRight.addChild(livesTxt);
	} else {
		livesTxt.setText("Deaths: x" + playerLives);
	}
	gamePhase = 0;
	phaseStartTime = LK.ticks;
	dragNode = null;
	playerBullets = []; // Clear player bullets
	playerFireCooldown = 0; // Reset fire cooldown
	// Clear existing elements from previous game (if any)
	// Note: LK engine handles full reset on GameOver/YouWin, but manual cleanup might be needed if restarting mid-game (not typical)
	// Let's assume full reset is handled by LK.
	// Create Player
	player = new UFO();
	player.x = 300;
	player.y = 2732 / 2;
	player.isDead = false;
	player.invincibleUntil = 0;
	player.alpha = 1; // Ensure player is visible
	game.addChild(player);
	// Create initial terrain
	var terrainWidth = LK.getAsset('terrain', {}).width; // Get width from asset
	for (var i = 0; i < Math.ceil(2048 / terrainWidth) + 1; i++) {
		createTerrainSegment(true, i * terrainWidth);
		createTerrainSegment(false, i * terrainWidth);
	}
	// Start Phase 1 Music
	LK.playMusic('phase1Music');
}
// Helper function to handle player death
function handlePlayerDeath() {
	if (!player || player.isDead) {
		return;
	}
	// Event Handlers
	player.isDead = true;
	player.alpha = 0; // Make player invisible during death processing
	LK.getSound('playerExplosion').play();
	// Optional: Flash the player before making them fully invisible, or flash screen
	// LK.effects.flashObject(player, 0xFF0000, 500);
	LK.effects.flashScreen(0xFF0000, 200); // Short screen flash
	playerLives--;
	if (livesTxt) {
		livesTxt.setText("Deaths: x" + playerLives);
	}
	LK.setTimeout(function () {
		if (playerLives > 0) {
			respawnPlayer();
		} else {
			LK.showGameOver();
		}
	}, 1000); // 1 second delay for effects and sound
}
// Helper function to respawn player at checkpoint
function respawnPlayer() {
	if (!player) {
		return;
	}
	player.x = 300;
	player.y = 2732 / 2;
	player.clampPosition();
	player.alpha = 1; // Make player visible again
	player.isDead = false;
	player.invincibleUntil = LK.ticks + 120; // 2 seconds of invincibility
	// Clear active threats
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		if (enemyBullets[i] && !enemyBullets[i].destroyed) {
			enemyBullets[i].destroy();
		}
	}
	enemyBullets = [];
	if (gamePhase === 2) {
		// Boss phase
		for (var i = bossLasers.length - 1; i >= 0; i--) {
			if (bossLasers[i] && !bossLasers[i].destroyed) {
				bossLasers[i].destroy();
			}
		}
		bossLasers = [];
	}
	// Player is reset, other game elements (enemies, boss health) remain.
}
// Call initGame to set up the initial state
initGame();
game.down = function (x, y, obj) {
	// Check if touch is on the player UFO
	var localPos = player.toLocal(game.toGlobal({
		x: x,
		y: y
	})); // Convert game coords to player's local coords
	// Use a slightly larger hit area for easier dragging
	var hitWidth = player.width * 1.5;
	var hitHeight = player.height * 1.5;
	if (Math.abs(localPos.x) < hitWidth / 2 && Math.abs(localPos.y) < hitHeight / 2) {
		dragNode = player;
		// Instantly move player to touch position for responsive feel
		var gamePos = game.toLocal(obj.global); // Use obj.global for precise position
		player.x = gamePos.x;
		player.y = gamePos.y;
		player.clampPosition();
	} else {
		dragNode = null;
	}
};
game.move = function (x, y, obj) {
	if (dragNode) {
		var gamePos = game.toLocal(obj.global); // Convert event global position to game coordinates
		dragNode.x = gamePos.x;
		dragNode.y = gamePos.y;
		// Clamp player position within bounds immediately after move
		if (dragNode === player) {
			player.clampPosition();
		}
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Game Update Logic
game.update = function () {
	if (!player || player.destroyed) {
		return; // Player fully gone, nothing to do.
	}
	// If player is dead, stop their specific logic & wait for respawn/game over timeout
	// Other game elements (enemies, bullets) might still update.
	// Player input and collisions will be gated by player.isDead or invincibility.
	// Player invincibility blinking
	if (player && !player.isDead && LK.ticks < player.invincibleUntil) {
		player.alpha = LK.ticks % 20 < 10 ? 0.5 : 1; // Blink
	} else if (player && !player.isDead && player.alpha !== 1) {
		player.alpha = 1; // Ensure alpha is reset
	}
	// --- Global Updates ---
	// Player Shooting
	playerFireCooldown++;
	if (!player.isDead && dragNode === player && playerFireCooldown >= playerFireRate) {
		// Only shoot while dragging/controlling and alive
		playerFireCooldown = 0;
		var bullet = new PlayerBullet(player.x + player.width / 2, player.y);
		game.addChild(bullet);
		playerBullets.push(bullet);
		LK.getSound('playerShoot').play();
	}
	// Score increases over time
	scoreIncrementTimer++;
	if (scoreIncrementTimer >= 60) {
		// Add 10 points every second
		scoreIncrementTimer = 0;
		LK.setScore(LK.getScore() + 10);
		scoreTxt.setText(LK.getScore());
	}
	// --- Phase Management ---
	var elapsedTicks = LK.ticks - phaseStartTime;
	if (gamePhase === 0 && elapsedTicks >= phaseDuration) {
		// Transition to Phase 1 (Space)
		gamePhase = 1;
		phaseStartTime = LK.ticks; // Reset timer for next phase if needed
		console.log("Transitioning to Phase 1: Space");
		// Clean up terrain-specific elements
		terrainSegmentsTop.forEach(function (s) {
			return s.destroy();
		});
		terrainSegmentsBottom.forEach(function (s) {
			return s.destroy();
		});
		mountains.forEach(function (m) {
			return m.destroy();
		});
		groundEnemies.forEach(function (ge) {
			return ge.destroy();
		});
		terrainSegmentsTop = [];
		terrainSegmentsBottom = [];
		mountains = [];
		groundEnemies = [];
		// Spawn initial air enemies
		for (var i = 0; i < 5; i++) {
			// Start with 5 air enemies
			spawnAirEnemy();
		}
		LK.playMusic('phase2Music'); // Switch music
	} else if (gamePhase === 1 && elapsedTicks >= phaseDuration * 1.5) {
		// Example: Boss after 1.5x phase duration
		// Transition to Phase 2 (Boss)
		if (!boss) {
			// Ensure boss only spawns once
			gamePhase = 2;
			phaseStartTime = LK.ticks;
			console.log("Transitioning to Phase 2: Boss");
			// Clean up air enemies
			airEnemies.forEach(function (ae) {
				return ae.destroy();
			});
			airEnemies = [];
			// Spawn Boss
			boss = new Boss();
			game.addChild(boss);
			LK.playMusic('bossMusic'); // Boss music
		}
	}
	// --- Phase 1: Terrain Logic ---
	if (gamePhase === 0) {
		// Update and manage terrain segments
		var terrainWidth = LK.getAsset('terrain', {}).width;
		for (var i = terrainSegmentsTop.length - 1; i >= 0; i--) {
			var segment = terrainSegmentsTop[i];
			if (segment.x < -terrainWidth) {
				// Reposition segment to the right
				var maxX = 0;
				terrainSegmentsTop.forEach(function (s) {
					if (s.x > maxX) {
						maxX = s.x;
					}
				});
				segment.x = maxX + terrainWidth;
				// Always spawn an enemy on the reused segment
				spawnGroundEnemy(segment);
				// Additionally, 50% chance for a mountain
				if (Math.random() < 0.5) {
					spawnMountain(segment);
				}
			}
		}
		// Repeat for bottom terrain
		for (var i = terrainSegmentsBottom.length - 1; i >= 0; i--) {
			var segment = terrainSegmentsBottom[i];
			if (segment.x < -terrainWidth) {
				var maxX = 0;
				terrainSegmentsBottom.forEach(function (s) {
					if (s.x > maxX) {
						maxX = s.x;
					}
				});
				segment.x = maxX + terrainWidth;
				// Always spawn an enemy on the reused segment
				spawnGroundEnemy(segment);
				// Additionally, 50% chance for a mountain
				if (Math.random() < 0.5) {
					spawnMountain(segment);
				}
			}
		}
		// Update mountains & check collision
		for (var i = mountains.length - 1; i >= 0; i--) {
			var mountain = mountains[i];
			if (mountain.x < -mountain.width) {
				mountain.destroy();
				mountains.splice(i, 1);
			} else {
				if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(mountain)) {
					handlePlayerDeath();
					return; // Stop update processing
				}
			}
		}
		// Update ground enemies & check collision
		for (var i = groundEnemies.length - 1; i >= 0; i--) {
			var enemy = groundEnemies[i];
			if (enemy.x < -enemy.width) {
				enemy.destroy();
				groundEnemies.splice(i, 1);
			} else {
				// Collision check: Player vs Ground Enemy
				if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(enemy)) {
					LK.getSound('enemyExplosion').play(); //{3L} // Enemy explodes
					enemy.destroy(); // Destroy enemy on collision too
					groundEnemies.splice(i, 1);
					handlePlayerDeath();
					return;
				}
			}
		}
		// Re-clamp player position based on potentially moving terrain (simple clamp for now)
		player.clampPosition();
	}
	// --- Phase 1/2: Air Enemy Logic ---
	if (gamePhase === 1) {
		// Add more air enemies periodically?
		if (LK.ticks % 180 === 0 && airEnemies.length < 10) {
			// Spawn if less than 10, every 3 seconds
			spawnAirEnemy();
		}
		// Update air enemies & check collision
		for (var i = airEnemies.length - 1; i >= 0; i--) {
			var enemy = airEnemies[i];
			// Air enemies handle their own off-screen logic (respawn) in their update
			// Collision check: Player vs Air Enemy
			if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(enemy)) {
				LK.getSound('enemyExplosion').play(); //{41} // Enemy explodes
				enemy.destroy(); // Destroy enemy on collision
				airEnemies.splice(i, 1);
				// LK.setScore(LK.getScore() + 50); // Score for destroying enemy - player died, maybe no score for this? Or keep it. Let's keep for now.
				// scoreTxt.setText(LK.getScore());
				handlePlayerDeath();
				return;
			}
		}
	}
	// --- Phase 3: Boss Logic ---
	if (gamePhase === 2 && boss) {
		// Check collision: Player vs Boss
		if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(boss)) {
			// Don't destroy boss on collision
			handlePlayerDeath();
			return;
		}
		// Update boss lasers & check collision
		for (var i = bossLasers.length - 1; i >= 0; i--) {
			var laser = bossLasers[i];
			// Check if laser is off-screen
			if (laser.x < -laser.width || laser.x > 2048 + laser.width || laser.y < -laser.height || laser.y > 2732 + laser.height) {
				laser.destroy();
				bossLasers.splice(i, 1);
			} else {
				// Collision check: Player vs Boss Laser
				if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(laser)) {
					laser.destroy(); // Destroy laser
					bossLasers.splice(i, 1);
					handlePlayerDeath();
					return;
				}
			}
		}
		// Note: Boss defeat condition is now handled within the player bullet collision check loop.
	}
	// --- Update Enemy Bullets & Check Collision (All Phases) ---
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var bullet = enemyBullets[i];
		// Check if bullet is off-screen
		if (bullet.y < -bullet.height || bullet.y > 2732 + bullet.height) {
			bullet.destroy();
			enemyBullets.splice(i, 1);
		} else {
			// Collision check: Player vs Enemy Bullet
			if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(bullet)) {
				bullet.destroy(); // Destroy bullet
				enemyBullets.splice(i, 1);
				handlePlayerDeath(); // This function now handles the delay and sound
				return; // Stop update processing
			}
		}
	}
	// --- Update Player Bullets & Check Collision ---
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var bullet = playerBullets[i];
		// Check if bullet is off-screen (right side)
		if (bullet.x > 2048 + bullet.width) {
			bullet.destroy();
			playerBullets.splice(i, 1);
			continue; // Skip collision checks if off-screen
		}
		// Collision Check: Player Bullet vs Ground Enemy (Phase 0)
		if (gamePhase === 0) {
			for (var j = groundEnemies.length - 1; j >= 0; j--) {
				var enemy = groundEnemies[j];
				if (bullet.intersects(enemy)) {
					LK.getSound('enemyExplosion').play();
					LK.effects.flashObject(enemy, 0xFFFFFF, 100); // Flash enemy white
					enemy.destroy();
					groundEnemies.splice(j, 1);
					bullet.destroy();
					playerBullets.splice(i, 1);
					LK.setScore(LK.getScore() + 100); // Score for destroying ground enemy
					scoreTxt.setText(LK.getScore());
					break; // Bullet can only hit one enemy
				}
			}
			if (!bullet.exists) {
				continue;
			} // Check if bullet was destroyed in previous loop
		}
		// Collision Check: Player Bullet vs Air Enemy (Phase 1)
		if (gamePhase === 1) {
			for (var j = airEnemies.length - 1; j >= 0; j--) {
				var enemy = airEnemies[j];
				if (bullet.intersects(enemy)) {
					LK.getSound('enemyExplosion').play();
					LK.effects.flashObject(enemy, 0xFFFFFF, 100); // Flash enemy white
					enemy.destroy();
					airEnemies.splice(j, 1);
					bullet.destroy();
					playerBullets.splice(i, 1);
					LK.setScore(LK.getScore() + 150); // Score for destroying air enemy
					scoreTxt.setText(LK.getScore());
					break; // Bullet can only hit one enemy
				}
			}
			if (!bullet.exists) {
				continue;
			} // Check if bullet was destroyed in previous loop
		}
		// Collision Check: Player Bullet vs Boss (Phase 2)
		if (gamePhase === 2 && boss) {
			if (bullet.intersects(boss)) {
				LK.getSound('enemyExplosion').play(); // Use enemy explosion for hit sound
				LK.effects.flashObject(boss, 0xFFFFFF, 100); // Flash boss white
				bullet.destroy();
				playerBullets.splice(i, 1);
				boss.health -= 1; // Decrease boss health
				LK.setScore(LK.getScore() + 10); // Small score for hitting boss
				scoreTxt.setText(LK.getScore());
				// Boss defeat check is now inside the bullet loop
				if (boss.health <= 0) {
					LK.getSound('enemyExplosion').play(); // Big explosion
					boss.destroy();
					boss = null;
					// Cleanup remaining lasers
					bossLasers.forEach(function (l) {
						return l.destroy();
					});
					bossLasers = [];
					LK.setScore(LK.getScore() + 5000); // Big score bonus
					scoreTxt.setText(LK.getScore());
					LK.showYouWin();
					return; // Stop update processing
				}
				break; // Bullet is destroyed after hitting boss
			}
		}
	} // End of playerBullets loop
};

===================================================================
--- original.js
+++ change.js
@@ -194,8 +194,10 @@
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
 	self.speed = 10; // Movement speed multiplier, adjust as needed
+	self.isDead = false;
+	self.invincibleUntil = 0;
 	// Keep UFO within game boundaries
 	self.clampPosition = function () {
 		var halfWidth = ufoGraphics.width / 2;
 		var halfHeight = ufoGraphics.height / 2;
@@ -235,25 +237,25 @@
 
 /**** 
 * Game Code
 ****/ 
-// Game State
+// LK.init.image('mountain', {width:150, height:250, id:'6819884bc4a0c8bae9e84ae0'}) // Removed - Replaced by top/bottom mountains
+// Minimalistic tween library which should be used for animations over time
+// Boss Laser Beam
+// Boss
+// Air Enemy (Placeholder shape)
+// Enemy Bullet
+// Ground Enemy
+// Mountain Obstacle (simplified)
+// Ground/Ceiling
+// Player UFO
+// Initialize assets used in this game. Scale them according to what is needed for the game.
 /**** 
 * Assets
 * Assets are automatically created and loaded either dynamically during gameplay
 * or via static code analysis based on their usage in the code.
 ****/ 
-// Initialize assets used in this game. Scale them according to what is needed for the game.
-// Player UFO
-// Ground/Ceiling
-// Mountain Obstacle (simplified)
-// Ground Enemy
-// Enemy Bullet
-// Air Enemy (Placeholder shape)
-// Boss
-// Boss Laser Beam
-// Minimalistic tween library which should be used for animations over time
-// LK.init.image('mountain', {width:150, height:250, id:'6819884bc4a0c8bae9e84ae0'}) // Removed - Replaced by top/bottom mountains
+// Game State
 var gamePhase = 0; // 0: Terrain, 1: Space, 2: Boss
 var phaseStartTime = LK.ticks;
 var phaseDuration = 3600; // 1 minute (60 seconds * 60 fps = 3600 ticks)
 var terrainSpeed = 5;
@@ -272,8 +274,12 @@
 // Player Control
 var dragNode = null;
 var playerFireRate = 15; // Ticks between shots (4 shots per second)
 var playerFireCooldown = 0;
+// Player Lives
+var MAX_PLAYER_LIVES = 5;
+var playerLives = MAX_PLAYER_LIVES;
+var livesTxt;
 // Score Display
 var scoreTxt = new Text2('0', {
 	size: 100,
 	fill: 0xFFFFFF
@@ -359,8 +365,22 @@
 function initGame() {
 	// Reset state
 	LK.setScore(0);
 	scoreTxt.setText('0');
+	// Initialize Lives
+	playerLives = MAX_PLAYER_LIVES;
+	if (!livesTxt) {
+		// Create only if it doesn't exist (for game restarts)
+		livesTxt = new Text2("Deaths: x" + playerLives, {
+			size: 80,
+			// Slightly smaller than score
+			fill: 0xFFFFFF
+		});
+		livesTxt.anchor.set(1, 0); // Anchor top-right
+		LK.gui.topRight.addChild(livesTxt);
+	} else {
+		livesTxt.setText("Deaths: x" + playerLives);
+	}
 	gamePhase = 0;
 	phaseStartTime = LK.ticks;
 	dragNode = null;
 	playerBullets = []; // Clear player bullets
@@ -371,8 +391,11 @@
 	// Create Player
 	player = new UFO();
 	player.x = 300;
 	player.y = 2732 / 2;
+	player.isDead = false;
+	player.invincibleUntil = 0;
+	player.alpha = 1; // Ensure player is visible
 	game.addChild(player);
 	// Create initial terrain
 	var terrainWidth = LK.getAsset('terrain', {}).width; // Get width from asset
 	for (var i = 0; i < Math.ceil(2048 / terrainWidth) + 1; i++) {
@@ -381,11 +404,63 @@
 	}
 	// Start Phase 1 Music
 	LK.playMusic('phase1Music');
 }
+// Helper function to handle player death
+function handlePlayerDeath() {
+	if (!player || player.isDead) {
+		return;
+	}
+	// Event Handlers
+	player.isDead = true;
+	player.alpha = 0; // Make player invisible during death processing
+	LK.getSound('playerExplosion').play();
+	// Optional: Flash the player before making them fully invisible, or flash screen
+	// LK.effects.flashObject(player, 0xFF0000, 500);
+	LK.effects.flashScreen(0xFF0000, 200); // Short screen flash
+	playerLives--;
+	if (livesTxt) {
+		livesTxt.setText("Deaths: x" + playerLives);
+	}
+	LK.setTimeout(function () {
+		if (playerLives > 0) {
+			respawnPlayer();
+		} else {
+			LK.showGameOver();
+		}
+	}, 1000); // 1 second delay for effects and sound
+}
+// Helper function to respawn player at checkpoint
+function respawnPlayer() {
+	if (!player) {
+		return;
+	}
+	player.x = 300;
+	player.y = 2732 / 2;
+	player.clampPosition();
+	player.alpha = 1; // Make player visible again
+	player.isDead = false;
+	player.invincibleUntil = LK.ticks + 120; // 2 seconds of invincibility
+	// Clear active threats
+	for (var i = enemyBullets.length - 1; i >= 0; i--) {
+		if (enemyBullets[i] && !enemyBullets[i].destroyed) {
+			enemyBullets[i].destroy();
+		}
+	}
+	enemyBullets = [];
+	if (gamePhase === 2) {
+		// Boss phase
+		for (var i = bossLasers.length - 1; i >= 0; i--) {
+			if (bossLasers[i] && !bossLasers[i].destroyed) {
+				bossLasers[i].destroy();
+			}
+		}
+		bossLasers = [];
+	}
+	// Player is reset, other game elements (enemies, boss health) remain.
+}
 // Call initGame to set up the initial state
 initGame();
-// Event Handlers
 game.down = function (x, y, obj) {
 	// Check if touch is on the player UFO
 	var localPos = player.toLocal(game.toGlobal({
 		x: x,
@@ -420,17 +495,25 @@
 	dragNode = null;
 };
 // Game Update Logic
 game.update = function () {
-	// --- Global Updates ---
 	if (!player || player.destroyed) {
-		// Check if player exists and is not destroyed
-		return;
-	} // Stop updates if player is destroyed
+		return; // Player fully gone, nothing to do.
+	}
+	// If player is dead, stop their specific logic & wait for respawn/game over timeout
+	// Other game elements (enemies, bullets) might still update.
+	// Player input and collisions will be gated by player.isDead or invincibility.
+	// Player invincibility blinking
+	if (player && !player.isDead && LK.ticks < player.invincibleUntil) {
+		player.alpha = LK.ticks % 20 < 10 ? 0.5 : 1; // Blink
+	} else if (player && !player.isDead && player.alpha !== 1) {
+		player.alpha = 1; // Ensure alpha is reset
+	}
+	// --- Global Updates ---
 	// Player Shooting
 	playerFireCooldown++;
-	if (dragNode === player && playerFireCooldown >= playerFireRate) {
-		// Only shoot while dragging/controlling
+	if (!player.isDead && dragNode === player && playerFireCooldown >= playerFireRate) {
+		// Only shoot while dragging/controlling and alive
 		playerFireCooldown = 0;
 		var bullet = new PlayerBullet(player.x + player.width / 2, player.y);
 		game.addChild(bullet);
 		playerBullets.push(bullet);
@@ -541,12 +624,10 @@
 			if (mountain.x < -mountain.width) {
 				mountain.destroy();
 				mountains.splice(i, 1);
 			} else {
-				if (player.intersects(mountain)) {
-					LK.getSound('playerExplosion').play();
-					LK.effects.flashObject(player, 0xFF0000, 500); // Flash player red
-					LK.showGameOver();
+				if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(mountain)) {
+					handlePlayerDeath();
 					return; // Stop update processing
 				}
 			}
 		}
@@ -557,15 +638,13 @@
 				enemy.destroy();
 				groundEnemies.splice(i, 1);
 			} else {
 				// Collision check: Player vs Ground Enemy
-				if (player.intersects(enemy)) {
-					LK.getSound('playerExplosion').play();
-					LK.getSound('enemyExplosion').play();
-					LK.effects.flashObject(player, 0xFF0000, 500);
+				if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(enemy)) {
+					LK.getSound('enemyExplosion').play(); //{3L} // Enemy explodes
 					enemy.destroy(); // Destroy enemy on collision too
 					groundEnemies.splice(i, 1);
-					LK.showGameOver();
+					handlePlayerDeath();
 					return;
 				}
 			}
 		}
@@ -583,30 +662,25 @@
 		for (var i = airEnemies.length - 1; i >= 0; i--) {
 			var enemy = airEnemies[i];
 			// Air enemies handle their own off-screen logic (respawn) in their update
 			// Collision check: Player vs Air Enemy
-			if (player.intersects(enemy)) {
-				LK.getSound('playerExplosion').play();
-				LK.effects.flashObject(player, 0xFF0000, 500);
+			if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(enemy)) {
+				LK.getSound('enemyExplosion').play(); //{41} // Enemy explodes
 				enemy.destroy(); // Destroy enemy on collision
 				airEnemies.splice(i, 1);
-				LK.getSound('enemyExplosion').play();
-				LK.setScore(LK.getScore() + 50); // Score for destroying enemy
-				scoreTxt.setText(LK.getScore());
-				LK.showGameOver();
+				// LK.setScore(LK.getScore() + 50); // Score for destroying enemy - player died, maybe no score for this? Or keep it. Let's keep for now.
+				// scoreTxt.setText(LK.getScore());
+				handlePlayerDeath();
 				return;
 			}
 		}
 	}
 	// --- Phase 3: Boss Logic ---
 	if (gamePhase === 2 && boss) {
 		// Check collision: Player vs Boss
-		if (player.intersects(boss)) {
-			LK.getSound('playerExplosion').play();
-			LK.getSound('playerExplosion').play();
-			LK.effects.flashObject(player, 0xFF0000, 500);
-			// Don't destroy boss on collision, just game over
-			LK.showGameOver();
+		if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(boss)) {
+			// Don't destroy boss on collision
+			handlePlayerDeath();
 			return;
 		}
 		// Update boss lasers & check collision
 		for (var i = bossLasers.length - 1; i >= 0; i--) {
@@ -616,15 +690,12 @@
 				laser.destroy();
 				bossLasers.splice(i, 1);
 			} else {
 				// Collision check: Player vs Boss Laser
-				if (player.intersects(laser)) {
-					LK.getSound('playerExplosion').play();
-					LK.getSound('playerExplosion').play();
-					LK.effects.flashObject(player, 0xFF0000, 500);
+				if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(laser)) {
 					laser.destroy(); // Destroy laser
 					bossLasers.splice(i, 1);
-					LK.showGameOver();
+					handlePlayerDeath();
 					return;
 				}
 			}
 		}
@@ -638,16 +709,12 @@
 			bullet.destroy();
 			enemyBullets.splice(i, 1);
 		} else {
 			// Collision check: Player vs Enemy Bullet
-			if (player.intersects(bullet)) {
-				LK.getSound('playerExplosion').play();
-				LK.effects.flashObject(player, 0xFF0000, 500);
+			if (!player.isDead && LK.ticks > player.invincibleUntil && player.intersects(bullet)) {
 				bullet.destroy(); // Destroy bullet
 				enemyBullets.splice(i, 1);
-				LK.setTimeout(function () {
-					LK.showGameOver();
-				}, 500); // Delay game over to let the sound play
+				handlePlayerDeath(); // This function now handles the delay and sound
 				return; // Stop update processing
 			}
 		}
 	}