BotPlayer.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.SocketException;
import java.util.Random;

/**
 * Starts the game with a Bot Player. Contains code for bot's decision making.
 *
 * @author : The unnamed tutor.
 */
public class BotPlayer implements Runnable {

	static final private int BOT_SLEEP = 500;
	private BufferedWriter toServer;
	private BufferedReader fromServer;
	private Random random;
	private static final char[] DIRECTIONS = {'N','S','E','W'};
	
	public BotPlayer(String hostName, int portNumber){
		random = new Random();
		try {
            Socket server = new Socket(hostName, portNumber);
            toServer = new BufferedWriter(new OutputStreamWriter(server.getOutputStream()));
            fromServer = new BufferedReader(new InputStreamReader(server.getInputStream()));
            writeToServer("bot");
        } catch (SocketException e) {
		    System.out.println("UNABLE TO CONNECT TO SERVER");
		    System.exit(0);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public void run(){
		while(true){
			try{
				String returned = fromServer.readLine();
				System.out.println(returned);
				while(fromServer.ready()){
					returned = fromServer.readLine();
					System.out.println(returned);
				}
				Thread.sleep(BOT_SLEEP);
				String action = getNextAction();
				writeToServer(action);
			}
			catch (SocketException e) {
                System.out.println("Server unexpectedly disconnected.");
                System.exit(0);
			}
			catch (IOException e) {
				e.printStackTrace();
			} 
			catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
	
    // Selects the next action the bot will perform. Simple implementation - just picks a random direction
    public String getNextAction() {
    	String action = "MOVE " + DIRECTIONS[random.nextInt(4)];
    	//System.out.println("Bots action " + action);
    	return action;
    }

    private void writeToServer(String message) {
        try {
            toServer.write(message);
            toServer.newLine();
            toServer.flush();
        } catch (SocketException e) {
            System.out.println("Server unexpectedly disconnected.");
            System.exit(0);
        } catch (IOException e) {
            System.out.println("hmmm");
            e.printStackTrace();
        }
    }

}