import java.util.Scanner;//name of the package(library)that includes the * class
 
public class ATM{//name of the program
 
	public static Scanner kbd;//Scanner kbd function
	public static void main(String[] args) {// the main program with the word void doesn't let anything out 
		String userAnswer = null;//declaring the string
		Scanner kbd = new Scanner(System.in); // declaring the function
		double accountbalance = 0, depositamount = 0, withdrawalbalance= 0;//declaring the variables, accountbalance, depositamount, withdrawalbalance, as double
		String acctNum,pwd;//declaring acctNum, pwd as string
		String acctres;//declaring acctres as string
		int counter=0;//declaring counter as int
		int Choice;//declaring Choice as int
		do//gives the do-while loop the condition to repeat the statement
		{
			System.out.println("Please enter your account number: ");//gives the system command to print
 
			acctNum = kbd.nextLine();//getting the inputs and allocating 
			System.out.println("Please enter your account password: ");//gives the system command to print
			pwd = kbd.nextLine();//getting the inputs and allocating 
 
			acctres=checkID(acctNum,pwd);//Initializing acctres
 
			if(!acctres.equals("error"))// checking for the situation of the acctres variable for error
			{
				accountbalance = Double.parseDouble(acctres);//Initializing accountbalance
 
				do//gives the do-while loop the condition to repeat the statement
				{
					Choice = Menu();//Initializing Menu()
					System.out.println(Choice);//gives the system command to print
					if (Choice == 1)//checking for input 1
					{
						System.out.println("Your Balance is: " + accountbalance + "$");//gives the system command to print
					}
					else if (Choice == 2)//checking for input 2
					{
						System.out.println("How much would you like to deposit to your account? ");//gives the system command to print
						depositamount=kbd.nextDouble();//getting the inputs and allocating
						double calculatebalance = Deposit(accountbalance, depositamount);//Initializing calculatebalance
						System.out.println("Your Balance with your Deposit now is: " + calculatebalance + "$");//gives the system command to print
					}
					else if (Choice == 3)//checking for input 3
					{
						System.out.println("How much would you like to withdrawal from your account? ");//gives the system command to print
						withdrawalbalance=kbd.nextDouble();//getting the inputs and allocating
						double calculatebalance1 = Withdraw(accountbalance, withdrawalbalance);//Initializing calculatebalance1
						System.out.println("You Balance now is: " + calculatebalance1 + "$");//gives the system command to print
					}
					else// checking for the other inputs except the ones which were mentioned
					{
						System.out.println("Do you want to Log Out? (Y or N) ");//gives the system command to print
						userAnswer=kbd.next();//getting the inputs and allocating
						userAnswer=userAnswer.toUpperCase();//to ignore the upper case or lower case input and count them as the same
						if (userAnswer.equals("Y"))//checking for the situation of userAnswer for being equal Y which means yes
						{
							System.out.println("You are now logged out!");//gives the system command to print
							System.exit(0);// gives command for the if statement
						}
 
					}
				}while ((Choice <=4)|| (userAnswer.equals("N")));//Checking input N
 
			}
			else// checking for other input except the ones that already were mentioned
			{
				System.out.println("Error");//gives the system command to print
				counter++;//Increasing the counter by 1
				System.out.println(counter);//gives the system command to print
			}
 
		}while(counter<3);//checking for the counter to be less than 3 or not	
 
		System.out.println("You have exceeded the required amount of times.");//gives the system command to print	
	}	
 
	public static String checkID(String acctNum, String pwd)//separating the part from the main program as a new function in the main function
	{
		String result = "error";//declaring the result as string
		// Strings a, b, and c contain the valid account numbers and passwords.
		// For each string, the account number is listed first, followed by
		// a space, followed by the password for the account, followed by a space,
		// followed by the current balance.
		String a = "44567-5 mypassword 520.36";//declaring string a which id equal 44567-5 mypassword 520.36 in this function
		String b = "12345-6 anotherpassword 48.20";//declaring string b which id equal 12345-6 anotherpassword 48.20 in this function
		String c = "54321-0 betterpassword 96.74";//declaring string c which id equal 54321-0 betterpassword 96.74 in this function
		String d=a.substring(0,7);//declaring string d in this function
		String e=a.substring(8,18);//declaring string e in this function
		String eres=a.substring(19);//declaring string eres in this function
		String f=b.substring(0,7);//declaring string f in this function
		String g=b.substring(8,23);//declaring string g in this function
		String gres=b.substring(24);//declaring string gres in this function
		String h=c.substring(0,7);//declaring string h in this function
		String i=c.substring(8,22);//declaring string i in this function
		String ires=c.substring(23);//declaring string ires in this function
		if(acctNum.equals(d) && pwd.equals(e))//checking for account number and password
		{
			result=eres;//gives commands for the if statement
		}  
		else if(acctNum.equals(f) && pwd.equals(g))//checking for account number and password
		{
			result=gres;//gives commands for the if statement
		}
		else if(acctNum.equals(h) && pwd.equals(i))//checking for account number and password
		{
			result=ires;//gives commands for the if statement
		}
		return result;//to get data out of the function and takes the value with it only once 
	}
 
	public static double Displaybalance1(double accountbalance)//separating the part from the main program as a new function in the main function          
	{
 
		return accountbalance;//to get data out of the function and takes the value with it only once 
	}
 
	public static double Deposit(double accountbalance, double depositamount)//separating the part from the main program as a new function in the main function          
	{
		return accountbalance+ depositamount;//to get data out of the function and takes the value with it only once 
	}
 
	public static double Withdraw(double accountbalance, double withdrawalbalance)//separating the part from the main program as a new function in the main function          
	{
		double newbalance1 = 0;//declaring the variables, newbalance1, as double
		if (withdrawalbalance<=accountbalance)//checking the condition in the parentheses(if withdrawalamount is less than or equal the accontbalance or not)
		{
			newbalance1 = accountbalance - withdrawalbalance;//gives the system command to print the calculated amount
		}
		else if (withdrawalbalance>accountbalance)//checking the condition in the parentheses(if withdrawalamount is more than the accontbalance or not)
		{
			newbalance1 = accountbalance;//declaring the newbalance1 as previous accountbalance without change
			System.out.println("error, that is impossible! your account balance still is: " + newbalance1);//gives the system command to print the accountbalance without changing it
		}
		return newbalance1;//to get data out of the function and takes the value with it only once 
	}
	public static int Menu()//separating the part from the main program as a new function in the main function
 
	{
		int Option ;//declaring the variables, Size, as int
		do//gives the do-while loop the condition to repeat the statement
		{
			Scanner kbd1 = new Scanner(System.in);// declaring the function
			System.out.println("1.  Display Balance ");//gives the system command to print
			System.out.println("2.  Deposit ");//gives the system command to print
			System.out.println("3.  Withdraw ");//gives the system command to print
			System.out.println("4.  Log Out ");//gives the system command to print
			System.out.println("Enter your option");//gives the system command to print
			Option = kbd1.nextInt();//getting the inputs and allocating
			if ((Option<=0)&&(Option > 4))//checking for the statement in parentheses(Smaller or equal 0 or bigger than 4 inputs)
			{
				System.out.println("Error! Choose again: ");//gives the system command to print 
			}
		}while ((Option<=0)&&(Option > 4));//gives the while loop the condition to stop the repeating statement
 
		return Option;//to get data out of the function and takes the value with it only once 
	}		
}