import java.util.*;

class GameManager {
    // Player management
    private List<Player> players;
    private Player currentPlayer;
    
    // Game state
    private GameState state;
    private int currentLevel;
    private int score;
    private boolean isPaused;
    private long gameStartTime;
    
    // Rendering related
    private Renderer renderer;
    private Camera camera;
    private List<Sprite> sprites;
    private List<Texture> textures;
    private RenderSettings renderSettings;
    
    // Audio related
    private AudioEngine audioEngine;
    private List<Sound> sounds;
    private float masterVolume;
    private boolean isMuted;
    
    // Network related
    private NetworkManager network;
    private List<NetworkMessage> messages;
    private String serverAddress;
    private boolean isConnected;
    
    // File system
    private FileManager fileManager;
    private SaveData saveData;
    private String saveFilePath;
    
    // Input handling
    private InputManager inputManager;
    private Map<String, Boolean> keyStates;
    
    // Physics
    private PhysicsEngine physicsEngine;
    private List<RigidBody> rigidBodies;

    public void updateGame() {
        updatePhysics();
        updatePlayers();
        updateNetworking();
        checkCollisions();
    }
    
    public void renderGame() {
        renderer.clear();
        renderSprites();
        renderUI();
        renderer.present();
    }
    
    public void handleInput() {
        inputManager.update();
        processKeyboard();
        processMouse();
    }
    
    public void playSound(int soundId) {
        if (!isMuted && soundId < sounds.size()) {
            audioEngine.play(sounds.get(soundId));
        }
    }
    
    public void saveGame() {
        saveData.setLevel(currentLevel);
        saveData.setScore(score);
        fileManager.save(saveData, saveFilePath);
    }
    
    public void loadGame() {
        saveData = fileManager.load(saveFilePath);
        currentLevel = saveData.getLevel();
        score = saveData.getScore();
    }
    
    public void sendNetworkMessage(String message) {
        if (isConnected) {
            network.send(new NetworkMessage(message));
        }
    }
    
    public void receiveNetworkMessage() {
        messages.addAll(network.receive());
    }
    
    public void addPlayer(Player player) {
        players.add(player);
    }
    
    public void removePlayer(int playerId) {
        players.removeIf(p -> p.getId() == playerId);
    }
    
    public void updateCamera() {
        if (currentPlayer != null) {
            camera.setPosition(currentPlayer.getPosition());
        }
    }
    
    public void loadTextures() {
        textures.clear();
        textures.addAll(fileManager.loadTextures());
    }
    
    // Physics methods
    private void updatePhysics() {
        physicsEngine.update();
    }
    
    private void checkCollisions() {
        for (RigidBody body : rigidBodies) {
            physicsEngine.checkCollisions(body);
        }
    }
    
    // Rendering methods
    private void renderSprites() {
        for (Sprite sprite : sprites) {
            renderer.draw(sprite);
        }
    }
    
    private void renderUI() {
        renderer.drawText("Score: " + score, 10, 10);
        renderer.drawText("Level: " + currentLevel, 10, 30);
    }
    
    // Input methods
    private void processKeyboard() {
        if (keyStates.get("SPACE")) {
            currentPlayer.jump();
        }
        if (keyStates.get("LEFT")) {
            currentPlayer.moveLeft();
        }
        if (keyStates.get("RIGHT")) {
            currentPlayer.moveRight();
        }
    }
    
    private void processMouse() {
        // Mouse input processing logic
    }
    
    // Player methods
    private void updatePlayers() {
        for (Player player : players) {
            player.update();
        }
    }
    
    // Network methods
    private void updateNetworking() {
        receiveNetworkMessage();
        processNetworkMessages();
    }
    
    private void processNetworkMessages() {
        for (NetworkMessage msg : messages) {
            handleNetworkMessage(msg);
        }
        messages.clear();
    }
    
    private void handleNetworkMessage(NetworkMessage message) {
        // Process individual network messages
    }
    
    // ... many more methods would continue here
}

// Supporting classes for demonstration
class Player {
    public int getId() { return 0; }
    public Vector getPosition() { return new Vector(); }
    public void jump() {}
    public void moveLeft() {}
    public void moveRight() {}
    public void update() {}
}

class Vector {
    public double x, y;
}

enum GameState { MENU, PLAYING, PAUSED, GAME_OVER }

class Renderer {
    public void clear() {}
    public void present() {}
    public void draw(Sprite sprite) {}
    public void drawText(String text, int x, int y) {}
}

class Camera {
    public void setPosition(Vector position) {}
}

class Sprite {}
class Texture {}
class RenderSettings {}
class AudioEngine {
    public void play(Sound sound) {}
}
class Sound {}
class NetworkManager {
    public void send(NetworkMessage message) {}
    public List<NetworkMessage> receive() { return new ArrayList<>(); }
}
class NetworkMessage {
    public NetworkMessage(String message) {}
}
class FileManager {
    public void save(SaveData data, String path) {}
    public SaveData load(String path) { return new SaveData(); }
    public List<Texture> loadTextures() { return new ArrayList<>(); }
}
class SaveData {
    public void setLevel(int level) {}
    public void setScore(int score) {}
    public int getLevel() { return 0; }
    public int getScore() { return 0; }
}
class InputManager {
    public void update() {}
}
class PhysicsEngine {
    public void update() {}
    public void checkCollisions(RigidBody body) {}
}
class RigidBody {}