NumberGuessingClient.java

import java.io.*;
import java.net.*;
import java.util.Scanner;

public class NumberGuessingClient {
    private static final int MIN_NUMBER = 1;
    private static final int MAX_NUMBER = 100;

    public static void main(String[] args) {
        // Get the server address from the environment variable "SERVER_ADDRESS"
        String serverAddress = System.getenv("SERVER_ADDRESS");
        if (serverAddress == null || serverAddress.isEmpty()) {
            serverAddress = "guess-server";  // Use the Docker Compose service name instead of localhost
        }
        
        
        int port = 12347;
        
        try (Socket socket = new Socket(serverAddress, port);
             BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
             PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
             Scanner scanner = new Scanner(System.in)) {

            System.out.println("Connected to Number Guessing Game Server at " + serverAddress + ":" + port);
            System.out.println("Game Rules:");
            System.out.println("- Enter a number between 1 and 100");
            System.out.println("- The server will transform your number based on special rules:");
            System.out.println("  * Odd numbers: A random prime number less than 17 will be added");
            System.out.println("  * Even numbers: The digits will be reversed");
            System.out.println("  * Then: If result ≥ 100, it's divided by 2; if < 50, it's multiplied by 2");
            System.out.println("- Try to guess a number that will transform to the target!");

            // Read initial player assignment info from the server
            String initialMessage = in.readLine();
            System.out.println("\n" + initialMessage);

            // Main game loop
            String response;
            while ((response = in.readLine()) != null) {
                System.out.println(response);

                if (response.contains("Enter your guess")) {
                    while (true) {
                        System.out.print("Your guess (" + MIN_NUMBER + "-" + MAX_NUMBER + "): ");
                        String guess = scanner.nextLine().trim();

                        try {
                            int number = Integer.parseInt(guess);
                            if (number >= MIN_NUMBER && number <= MAX_NUMBER) {
                                out.println(guess);
                                break;
                            } else {
                                System.out.println("Please enter a number between " + MIN_NUMBER + " and " + MAX_NUMBER);
                            }
                        } catch (NumberFormatException e) {
                            System.out.println("Please enter a valid number");
                        }
                    }
                } else if (response.contains("Do you want to play again")) {
                    while (true) {
                        System.out.print("Play again? (y/n): ");
                        String answer = scanner.nextLine().trim().toLowerCase();
                        if (answer.equals("y") || answer.equals("n")) {
                            out.println(answer);
                            break;
                        } else {
                            System.out.println("Please enter 'y' for yes or 'n' for no");
                        }
                    }
                } else if (response.contains("Goodbye!")) {
                    System.out.println("Thanks for playing!");
                    break;
                }
            }
        } catch (ConnectException e) {
            System.err.println("Could not connect to the server at " + serverAddress + ". Make sure it's running.");
        } catch (IOException e) {
            System.err.println("Lost connection to the server: " + e.getMessage());
        }
    }
}