import java.util.Scanner;

class CheckingAccount {
    private String accountNumber, accountHolder;
    private int balance = 0, useCount = 0;

    CheckingAccount( String accNumber, String holder, String password, int start ) {
        accountNumber = accNumber ;
        accountHolder = holder ;
        balance       = start ;
    }

    int getBalance() {
       return balance;
    }

    void processDeposit( int amount ) {
        if (((balance + amount) < 2000000000) && amount < 2000000000) {
        balance += amount;
        System.out.println("Deposited " + amount + " into account.");
        System.out.println("Balance is now " + balance);
        skipLine(2);
    } else {
            System.out.println("Overflow - deposit is too high.");
        }
    }

    void processDeposit (int amount, int charge) {
        balance += (amount-charge);
        System.out.println("Deposited " + amount + " into account with a " + charge + " cent fee.");
        System.out.println("Balance is now " + balance);
        skipLine(2);
    }

    void processCheck( int amount ) {
        int charge;
        if ( balance < 100000 ) {
          charge = 15;
        } else {
          charge = 0;
        }
        balance -= (amount + charge)  ;
        System.out.println("Withdrew " + amount + " from account with a " + charge + " cent fee.");
        System.out.println("Balance is now " + balance);
        skipLine(2);
    }

    void display() {
      System.out.println("Account number: " + accountNumber + " || Owner: " + accountHolder + " || Current Balance: " + getBalance());
      skipLine(2);
    }

    void skipLine(int c) {
        for (int i = 0; i < c; i++) {
            System.out.println("");
        }
    }

    void payOther(int amount, CheckingAccount c) {
      processCheck(amount);
      c.processDeposit(amount);
      System.out.println(
      "Paid " + amount + " to another account, current balance is now " + balance +
      ". Other person's balance is now " + c.getBalance() + "."
      );
      skipLine(2);
    }
}

class methods {
    int i = 0, status = 0, j = 0, response = 0;
    String input = "";

    Scanner scan = new Scanner( System.in );
    CheckingAccount David = new CheckingAccount( "92a-44-35", "David", "123123", 10000000 );
    CheckingAccount Mei = new CheckingAccount( "92a-44-33", "Mei", "123123a", 0 );
    CheckingAccount Feng = new CheckingAccount( "92a-44-34", "Feng", "123123a", 50000);
    CheckingAccount currentAccount = null;
    CheckingAccount destinedAccount = null;
    String[] userNames = {"David", "Mei", "Feng"};
    String[] passKeys = {"123123", "123123a", "123123a"};
    String thisUser = "", menuResponse = "";

    public void login() {
        System.out.println("Please enter your account name:");
        String username = scan.next();
        for (i = 0; i<userNames.length; i++) {
            if (username.equalsIgnoreCase(userNames[i])) {
                thisUser = userNames[i];
                j = i;
                status = 2;
            }
        }
        if (thisUser == "") {
            System.out.println("Invalid user.");
        }
    }

    public void welcome() {
        System.out.println(
            "What would you like to access today? " +
            "\r\n1: account"
        );
        input = scan.next();
        if (input.equalsIgnoreCase("account")) {
            status = 1;
        } else {
            System.out.println("Invalid.");
        }
    }

    public void checkPassword() {
        String passKey = scan.next();
        if (passKey.equalsIgnoreCase(passKeys[j])) {
            System.out.println("Account confirmed.");
            status = 3;
        } else {
            System.out.println("Wrong password.");
        }
    }

    public int getStatus() {
        return status;
    }

    public void mainMenu() {
        System.out.println("Main menu:\r\n1. Deposit\r\n2. Withdraw\r\n3. Transfer Funds (xfer)\r\n4. Check balance\r\n5. Logout");
        menuResponse = scan.next();
        postMenu();
    }

    public void postMenu() {
        if (menuResponse.equalsIgnoreCase("deposit")) {
            response = 1;
            status = 4;
        } else if (menuResponse.equalsIgnoreCase("withdraw")) {
            response = 2;
            status = 4;
        } else if (menuResponse.equalsIgnoreCase("xfer")) {
            response = 3;
            status = 4;
        } else if (menuResponse.equalsIgnoreCase("balance")) {
            response = 4;
            status = 4;
        } else if (menuResponse.equalsIgnoreCase("logout")) {
            response = 5;
            status = 4;
        } else {
            System.out.println("Invalid, please try another option.");
            mainMenu();
        }
    }

    public void accessAccount() {
        if (thisUser.equalsIgnoreCase("David")) {
            System.out.println("Confirmed. Please enter your password:");
            currentAccount = David;
        } else if (thisUser.equalsIgnoreCase("Mei")) {
            System.out.println("Confirmed. Please enter your password:");
            currentAccount = Mei;
        } else if (thisUser.equalsIgnoreCase("Feng")) {
            System.out.println("Confirmed. Please enter your password:");
            currentAccount = Feng;
        }
    }

    public void redirection() {
        if (response == 1) {
            deposit();
        } else if (response == 2) {
            withdraw();
        } else if (response == 3) {
            xfer();
        } else if (response == 4) {
            checkThisBalance();
        } else if (response == 5) {
            logout();
        }
    }

    public void deposit() {
        System.out.println("How much would you like to deposit?");
        String amount = scan.next();
        int thisAmount = Integer.parseInt(amount);
        currentAccount.processDeposit(thisAmount);
        status = 3;
        mainMenu();
    }

    public void withdraw() {
        System.out.println("How much would you like to withdraw?");
        String amount = scan.next();
        int thisAmount = Integer.parseInt(amount);
        currentAccount.processCheck(thisAmount);
        status = 3;
        mainMenu();
    }

    public void xfer() {
        System.out.println("Who do you want to wire your money to?");
        String userInput = scan.next();
        if (userInput.equalsIgnoreCase("David")) {
            destinedAccount = David;
        } else if (userInput.equalsIgnoreCase("Mei")) {
            destinedAccount = Mei;
        } else if (userInput.equalsIgnoreCase("Feng")) {
            destinedAccount = Feng;
        } else {
            destinedAccount = currentAccount;
        }
        System.out.println("Please enter the amount you want to wire over:");
        String amountString = scan.next();
        int thisAmount = Integer.parseInt(amountString);
        currentAccount.payOther(thisAmount, destinedAccount);
        status = 3;
        mainMenu();
    }

    public void checkThisBalance() {
        currentAccount.display();
        status = 3;
        mainMenu();
    }

    public void logout() {
        currentAccount = null;
        System.out.println("Logged off! Goodbye.");
        status = 0;
    }

}

class CheckingAccountTester {
    public static void main( String[] args ) {
        methods m = new methods();
        int omg = 0;
        while (omg == 0) {
            if (m.getStatus() == 0) {
                m.welcome();
            }
            if (m.getStatus() == 1) {
                m.login();
                m.accessAccount();
            }
            if (m.getStatus() == 2) {
                m.checkPassword();
            }
            if (m.getStatus() == 3) {
                m.mainMenu();
            }
            if (m.getStatus() == 4) {
                m.redirection();
            } else {
                m.redirection();
            }
        }
    }
}