ATM

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

/**
 * Created by Dawood on 2016-11-29.
 */
public class ATMClient
{
    private static int connectionPort = 8999;

    public static void main(String[] args) throws Exception
    {
        String address = "127.0.0.1";
        Socket ATMSocket = new Socket(address, connectionPort);
        PrintWriter out = new PrintWriter(ATMSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(ATMSocket.getInputStream()));
        Scanner scanner = new Scanner(System.in);

        System.out.println("Contacting bank ... ");
        System.out.println(in.readLine());
        System.out.println(in.readLine());

        /*While we don't get code 1 from the server
        we should tell the user that login failed and that
        he can either quit or retry the login process.*/
        while(true)
        {
            int temp = scanner.nextInt();
            if(temp == -1) return;
            out.println(temp);
            out.println(scanner.nextInt());
            if(Integer.parseInt(in.readLine()) == 1) break;
            System.out.println("Login failed, retry or write '-1' to exit");
        }


        System.out.println("You have successfully logged in!");
        printMenu(in);

        System.out.print("> ");
        int menuOption = scanner.nextInt();
        out.println(menuOption);

        int userInput;
        while(menuOption < 4)
        {
            if(menuOption == 1)
            {
                System.out.println(in.readLine());
                printMenu(in);
                System.out.print("> ");
                menuOption = scanner.nextInt();
                out.println(menuOption);
            }
            else if (menuOption > 3)
            {
                break;
            }
            else
            {
                if(menuOption == 2)
                {
                    int verified = -1;
                    while(verified != 1)
                    {
                        BufferedReader BR = new BufferedReader(new InputStreamReader(System.in));
                        String temp;
                        System.out.println(in.readLine());
                        out.println(temp = BR.readLine());
                        if(temp.equals("-1")) return;
                        verified = Integer.parseInt(in.readLine());
                        if(verified != 1) System.out.println("The one time code you entered is not valid!");
                    }
                }
                System.out.println(in.readLine());
                userInput = scanner.nextInt();
                out.println(userInput);
                String str;
                str = in.readLine();
                System.out.println(str);
                printMenu(in);
                System.out.print("> ");
                menuOption = scanner.nextInt();
                out.println(menuOption);
            }
        }

        out.close();
        in.close();
        ATMSocket.close();
    }

    private static void printMenu(BufferedReader BR) throws IOException
    {
        for(int a = 0; a < 4; a++)
        {
            System.out.println(BR.readLine());
        }
    }
}
///////SERVER SERVER SERVER /////////////////////////////////////////
import java.net.*;

/**
 * Created by Dawood on 2016-11-29.
 */
public class ATMServer
{
    private static int connectionPort = 8999;

    public static void main(String[] args) throws Exception
    {
        boolean listening = true;
        ServerSocket serverSocket = new ServerSocket(connectionPort);

        System.out.println("Bank started listening on port: " + connectionPort);

        while (listening) new ATMServerThread(serverSocket.accept()).start();

        serverSocket.close();
    }
}

//////SERVERTHREAD SERVERTHREAD /////////////////////////////////
import java.io.*;
import java.net.*;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by Dawood on 2016-11-29.
 */
public class ATMServerThread extends Thread
{
    private Socket socket;
    private BufferedReader BR;
    private PrintWriter PW;

    //Variables for holding user information.
    private int CARDNUMBER;
    private int CODE;
    private int BALANCE;
    private String FILEPATH = "D:\\Users\\Dawood\\IdeaProjects\\LabInet\\src\\Accounts.txt";

    public ATMServerThread(Socket socket) throws Exception
    {
        super("ATMServerThread");
        this.socket = socket;
        PW = new PrintWriter(this.socket.getOutputStream(), true);
        BR = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
    }

    public void run()
    {
        try
        {
            String inputLine;
            int value;

            PW.println("Welcome to Bank!");
            PW.println("Please Enter Your Card Number Followed By A New Line Followed By The Code");

            verifyLogin();
            sendMenu();

            inputLine = BR.readLine();
            int choice = Integer.parseInt(inputLine);
            while (choice != 4)
            {
                int deposit = 1;
                switch (choice)
                {
                    case 2:
                        int returnCode;
                        while((returnCode = withdrawCode()) != 1)
                        {
                            if(returnCode == -1)
                                return;
                        }

                        deposit = -1;
                    case 3:
                        PW.println("Enter amount: ");
                        inputLine = BR.readLine();
                        value = Integer.parseInt(inputLine);
                        BALANCE += deposit * value;
                        modifyFile();
                    case 1:
                        PW.println("Current balance is " + BALANCE + " dollars");
                        sendMenu();
                        inputLine = BR.readLine();
                        choice = Integer.parseInt(inputLine);
                        break;
                    default:
                        break;
                }
            }
            PW.println("Good Bye");
            PW.close();
            BR.close();
            socket.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

    private int withdrawCode()
    {
        try
        {
            int verified = -1;
            while(verified != 1)
            {
                PW.println("Please enter your one time code or enter '-1' to exit");
                String temp = BR.readLine();
                if(temp.equals("-1"))
                    return -1;
                if(temp.length() == 2 && temp.charAt(0) >= '0' && temp.charAt(0) <= '9' && temp.charAt(1) >= '0' && temp.charAt(1) <= '9')
                    verified = 1;
                PW.println(verified);
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        return 1;
    }

    private void sendMenu()
    {
        PW.println("(1)Balance");
        PW.println("(2)Withdrawal");
        PW.println("(3)Deposit");
        PW.println("(4)Exit");
    }

    private void verifyLogin()
    {
        try
        {
            boolean match = false;
            while(!match)
            {
                BufferedReader FileBR = new BufferedReader(new FileReader("D:\\Users\\Dawood\\IdeaProjects\\LabInet\\src\\Accounts.txt"));
                CARDNUMBER = Integer.parseInt(BR.readLine());
                CODE = Integer.parseInt(BR.readLine());
                String tempCARDNUMBER;
                String tempCODE;
                String tempBALANCE;
                while((tempCARDNUMBER = FileBR.readLine()) != null)
                {
                    tempCODE = FileBR.readLine();
                    tempBALANCE = FileBR.readLine();
                    if(Integer.parseInt(tempCARDNUMBER) == CARDNUMBER && Integer.parseInt(tempCODE) == CODE)
                    {
                        BALANCE = Integer.parseInt(tempBALANCE);
                        PW.println(1);
                        match = true;
                        break;
                    }
                }
                if(!match) PW.println(-1);
                FileBR.close();
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

    private void modifyFile()
    {
        try
        {
            ArrayList<String> rows = new ArrayList<>();
            BufferedReader FileBR = new BufferedReader(new FileReader(FILEPATH));
            String tempCARDNUMBER;
            String tempCODE;
            String tempBALANCE;
            while((tempCARDNUMBER = FileBR.readLine()) != null)
            {
                rows.add(tempCARDNUMBER);
                tempCODE = FileBR.readLine();
                rows.add(tempCODE);
                tempBALANCE = FileBR.readLine();

                if(Integer.parseInt(tempCARDNUMBER) == CARDNUMBER && Integer.parseInt(tempCODE) == CODE)
                    rows.add(Integer.toString(BALANCE));
                else
                    rows.add(tempBALANCE);
            }
            FileBR.close();
            BufferedWriter FileBW = new BufferedWriter(new FileWriter(FILEPATH));
            for(int a = 0; a < rows.size(); a++)
            {
                FileBW.write(rows.get(a));
                FileBW.newLine();
            }
            FileBW.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }
}