Menu

package ie.gmit.dip;

import java.util.Scanner;
import java.io.*;

public class Menu {
	// instance variables of menu class are declared
	private Scanner scan;
	private boolean keepRunning = true;
	private FourSquareCipher cipher;
	private char[][] newArray = null;// this causes the nullpointer exception if no keyword is entered.
	
	

	public Menu() {
		//  assignment of a new scanner object to instance variable
		scan = new Scanner(System.in);
		// showMenu method and there after the processInput method are called continuously as long as "keeprunning" variable is true.
		do {
			showMenu();
			processInput();
		} while (keepRunning == true);

	}
	// showMenu method just prints out a menu
	public void showMenu() {
		System.out.println("------FOUR SQUARE CIPHER ---------\n Select one of the options below\n if you have not already entered keywords then you must begin with this step. Please choose option 1.\n");
		System.out.println("1) Enter the keyword(s) for the cipher ");
		System.out.println("2) Encrypt text from file or url");
		System.out.println("3) Decrypt text from file or url");
		System.out.println("4) Quit");

	}

	public void processInput() throws NumberFormatException {
		String input = scan.nextLine();
		cipher = new FourSquareCipher();
		// try catch statement has been added for whenever the user enters anything else other than a number in the command line.
		try {
			int choice = Integer.parseInt(input);
			// switch statement is used in order to process the input options of the user which could be one of 4 options/branches
			switch (choice) {
			case 1:
				newArray = enterKeysMenu();// the changed char [][] array has been brought up the chain to be 
				// fed down to the other methods by means of passing arguments into the arrays.
				break;
			case 2:
				encryptMenu();
				break;
			case 3:
				decryptMenu();
				break;
			case 4:
				keepRunning = false;
				break;
			default:
				System.out.println("Invalid selection.");
				break;
			}
		} catch (NumberFormatException nfe) {
			System.out.println("Please enter a number between 1-4 to make a selection");
		}
		

		

	}
	
	
		
	
	public char[][] enterKeysMenu() {
		
		// the user is asked for input
		System.out.println("Please enter the first keyword (duplicate letters will be removed) ");
		String key1 = scan.nextLine();
		Parser p = new Parser();
		//that input is passed to the parseKey method of the Parser class
		char[] newKey= p.parseKey(key1);
		// the returned char[] array from the parseKey method is assigned to the newKey variable
		// the newKey-char[] array is then passed to the setNewkeyUpperRight method of the FourSquareCipher class.
		cipher.setNewKeyUpperRight(newKey);
		
		
		System.out.println("Please enter the second keyword (duplicate letters will be removed)");
		String key2 = scan.nextLine();
		char[] newKey2= p.parseKey(key2);
		newArray = cipher.setNewKeyBottomLeft(newKey2);// this is the matrix array with the keys added
		System.out.println("The ciphertext squares of the four square matrix have been populated successfully");
		System.out.println("You can now encrypt or decrypt your document\n");
		return newArray;
	}
	
	public void encryptMenu() {
		// the user is asked to enter a file name or url path
		System.out.println("please enter your file name (include file extension)\n or url that you wish to be encrypted ");
		String input = scan.nextLine();
		Parser p = new Parser();
		// input is passed into the parseEncrypt method of the Parse class.
		p.parseEncrypt(input, Parser.isValid(input),newArray);
		System.out.println("your encrypted text has been saved to the file: encrypted.txt");
		
	}

	public void decryptMenu() {
		System.out.println("please enter your file name(include file extension)\n or url that you wish to be decrypted ");
		String input = scan.nextLine();
		Parser p = new Parser();
		String [] result = p.parseDecrypt(input, Parser.isValid(input), newArray);
		System.out.println("your decrypted text has been saved to the file: decrypted.txt");
	}
	
	  public void printmulti() {
			for(int row=0;row<newArray.length;row++) {
				System.out.print("{");
				for(int col = 0;col<newArray[row].length;col++) {
					System.out.print(" " +newArray[row][col]+ " ,");
				}
				System.out.println("}");
			}
			
		}
		
	

}