import java.util.Scanner;

public class ATM2 {
    public static void main(String[] args){

        int userCount = 0;
        int userPosition = 0;
        int menuChoice = 0;
        boolean loop = true;
        user[] userArray = new user[10];
        Scanner scanner = new Scanner(System.in);

        while(loop != false){

            menuPrint();
            menuChoice = scanner.nextInt();

            if(menuChoice==1){
                System.out.print("Please input desired username: ");
                String tempUser = scanner.next();
                System.out.print("Please input desired 4 digit PIN ");
                int tempPin = scanner.nextInt();
                    if(tempPin < 0 || tempPin > 9999){
                        System.out.println("Please input valid 4 (0-9) digit PIN!");
                    }
                    else if(tempPin >= 0 && tempPin <= 9999 && userCount < 10){
                        userArray[userCount] = user.createUser(tempUser,tempPin);
                        userCount++;
                        System.out.println("User " + tempUser + " account created!");
                    }
                    else if(userCount==10){
                        System.out.println("Too many users!");
                    }
            }

            else if(menuChoice==2){
                if(userCount > 0){
                    System.out.println(userPosition);
                    System.out.print("Please input username: ");
                    String tempUser = scanner.next();
                    System.out.print("Please input 4 digit PIN ");
                    int tempPin = scanner.nextInt();
                    userPosition = user.login(tempUser,tempPin,userCount,userArray);
                    System.out.println(userPosition);
                }
                else if(userCount==0){
                    System.out.println("No users are registered.");
                }
                else if(userArray[userPosition].loginToken = true){
                    System.out.println("You are now logged in.");
                }

            }

            else if(menuChoice==3){
                System.out.println("How much would you like to deposit?: ");
                int depositRequest = scanner.nextInt();
                user.Deposit(depositRequest, userPosition,userArray);
            }

            else if(menuChoice==4){
                System.out.println("How much would you like to withdraw?: ");
                int withdrawRequest = scanner.nextInt();
                user.Withdraw(withdrawRequest,userPosition,userArray);
            }
            else if(menuChoice==5){
                user.checkBalance(userPosition, userArray);
            }
            else if(menuChoice==6){
                System.out.println("You are now logged out.");
                userArray[userPosition].loginToken = false;
            }
            else{
                System.out.println("Please make a valid selection (1-6).");
            }


        }


    }

    static void menuPrint(){
        System.out.println("Please make a selection: ");
        System.out.println("1 - Register");
        System.out.println("2 - Login");
        System.out.println("3 - Deposit");
        System.out.println("4 - Withdraw");
        System.out.println("5 - Check Balance");
        System.out.println("6 - Log Out");
    }
}

class user{
    private
        int pin;
        String id;
        float balance = 0;

    public
        boolean loginToken;

    public static user createUser(String inputUser, int inputPin){
        user newUser = new user();
        newUser.id = inputUser;
        newUser.pin = inputPin;
        return newUser;
    }

    public static int login(String inputUser, int inputPin, int userCount, user[] userArray){
        int x = 0;
        int userPosition = 0;

        while(x < userCount){
            userArray[x].loginToken = false;
            x++;
        }
        x=0;

        while(x < userCount){
            if(userArray[x].id.equals(inputUser) && (userArray[x].pin == inputPin)) {
                userArray[x].loginToken = true;
                System.out.println("You are now logged in!");
                userPosition = x;
            }
            x++;
        }
        return userPosition;
    }


    public static void Deposit(int depositRequest,int userPosition, user[] userArray){
        if(userArray[userPosition].loginToken = true){
            userArray[userPosition].balance += depositRequest;
            System.out.println("Your new balance is: $ "+ userArray[userPosition].balance);
        }
        if(userArray[userPosition].loginToken = false){
            System.out.println("You need to login.");
        }
    }
    public static void Withdraw(int withdrawRequest,int userPosition, user[] userArray){
        if(userArray[userPosition].loginToken = true && userArray[userPosition].balance >= withdrawRequest){
            userArray[userPosition].balance -= withdrawRequest;
            System.out.println("Take your requested $ " + withdrawRequest);
            System.out.println("Your new balance is: $ " + userArray[userPosition].balance);
        }
        if(userArray[userPosition].loginToken = false){
            System.out.println("You need to login.");
        }
        if(userArray[userPosition].balance < withdrawRequest){
            System.out.println("You have insufficient funds!");
        }



    }

    public static void checkBalance(int userPosition,user[] userArray){
        if(userArray[userPosition].loginToken = true){
            System.out.println("Your balance is: $" + (userArray[userPosition].balance));
        }
        if(userArray[userPosition].loginToken = false){
            System.out.println("You need to login.");
        }
    }


}