/**

* Java. Level 2. Lesson 7

* Simple chat client v2

*

* @author Sergey Iryupin

* @version 0.2.1 dated Jan 16, 2018

*/

import java.net.Socket;

import java.io.PrintWriter;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.io.IOException;

import java.util.Scanner;

class SimpleClient implements IConstants {

public static void main(String[] args) {

new SimpleClient();

}

SimpleClient() {

String message;

try (Socket socket = new Socket(SERVER_ADDR, SERVER_PORT);

PrintWriter writer = new PrintWriter(socket.getOutputStream());

BufferedReader reader = new BufferedReader(

new InputStreamReader(socket.getInputStream()));

Scanner scanner = new Scanner(System.in)) {

System.out.println(CONNECT_TO_SERVER);

// sending: auth <login> <passwd>

writer.println(getLoginAndPassword(scanner));

writer.flush();

new Thread(new ServerListener(reader)).start();

do {

message = scanner.nextLine();

writer.println(message);

writer.flush();

} while (!message.equals(EXIT_COMMAND));

socket.close();

} catch (IOException ex) {

System.out.println(ex.getMessage());

}

System.out.println(CONNECT_CLOSED);

}

/**

* getLoginAndPassword: read login and password from keyboard

*/

private String getLoginAndPassword(Scanner scanner) {

System.out.print(LOGIN_PROMPT);

String login = scanner.nextLine();

System.out.print(PASSWD_PROMPT);

return AUTH_SIGN + " " + login + " " + scanner.nextLine();

}

/**

* ServerListener: get messages from Server

*/

class ServerListener implements Runnable {

BufferedReader reader;

ServerListener(BufferedReader reader) {

this.reader = reader;

}

@Override

public void run() {

String message;

try {

while ((message = reader.readLine()) != null) {

System.out.print(message.equals("\0")?

CLIENT_PROMPT : message + "\n");

if (message.equals(AUTH_FAIL))

System.exit(-1); // terminate client

}

} catch (IOException ex) {

System.out.println(ex.getMessage());

}

}

}

}