public class MiniEncryption {

    /**
     * @param args the command line arguments
     */
    private static Scanner input = new Scanner(System.in);

    public static void main(String[] args) {
        String characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 ,.!";
        String userInput = "";

        int i = 0;
        while (userInput.length() < characters.length()) {
            System.out.format("Map for %s ", characters.charAt(i));
            char charainput = input.nextLine().toUpperCase().charAt(0);
            if (!checkDuplicate(userInput, charainput) && checkValues(characters, charainput)) {
                userInput += charainput;
                i++;
            } else {
                System.out.println("wrong value please try again");
            }
        }
        while (true) {
            System.out.println("Mapping complete enter encrypted word");
            String word = input.nextLine();
            String encrypted = encryptWord(characters, userInput, word);
            String decrypted = decryptword(characters, userInput, word);

            System.out.println("the word encrypted is " + encrypted);
            System.out.println("the word decrypted is " + decrypted);

             System.out.println("Do you wish to try again? (y/n)");
             char answer = input.nextLine().toUpperCase().charAt(0);
             if (answer == 'N') {
                System.out.println("thank you");
                break;
            }
        }
    }

    public static boolean checkDuplicate(String Usercharacters, char input) {

        for (int i = 0; i < Usercharacters.length(); i++) {
            if (Usercharacters.contains(Character.toString(input))) {
                return true;
            }
        }
        return false;

    }

    public static boolean checkValues(String Mapcharacters, char input) {
        for (int i = 0; i < Mapcharacters.length(); i++) {
            if (!Mapcharacters.contains(Character.toString(input))) {
                return true;
            }
        }
        return false;

    }

    public static String encryptWord(String characters, String usercharacters, String word) {
        String encryptword = "";
        for (int i = 0; i < word.length(); i++) {
            int index = characters.indexOf(word.charAt(i));
            encryptword += usercharacters.charAt(index);
        }
        return encryptword;
    }

    public static String decryptword(String characters, String usercharacters, String word) {
        String decryptword = "";
        for (int i = 0; i < word.length(); i++) {
            int index = usercharacters.indexOf(word.charAt(i));
            decryptword += characters.charAt(index);
        }
        return decryptword;
    }

}