package Crypter;


import java.util.HashMap;

/**
 * Implementierung des Crypter-Interfaces.
 */
public class CrypterImpl implements Crypter { 

    private HashMap<String, String> clear = new HashMap<String, String>();

    public CrypterImpl() {

        for (int i = 0; i < CLEAR_ALPHABET.length(); i++) {
            String zw2 = CYPHER_ALPHABET.charAt(i) + "";
            String zw1 = CLEAR_ALPHABET.charAt(i) + "";
            clear.put(zw1, zw2);
        }
    }

    @Override
    public String encrypt(String input) {
        if (input.equals(null)) {
            return null;
        } else {
            input = input.toLowerCase();
            String result = "";
            
            for (int i = 0; i < input.length(); i++) {
                if (clear.containsKey(input.charAt(i) + "")) {
                    result += clear.get(input.charAt(i) + "");

                } else if (input.charAt(i) == '!' 
                        || input.charAt(i) == '(' 
                        || input.charAt(i) == ')'
                        || input.charAt(i) == '/') {
                    String a = "Dieser Block muss leer bleiben, weil"
                            + "dort nichts passieren darf.";
                } else {
                    result += input.charAt(i) + "";
                }
            }
            return result;
        }

    }

    @Override
    public String decrypt(String input) {
        for (int i = 0; i < input.length(); i++) {
            if (input.charAt(i) == '!' 
                    || input.charAt(i) == 'Ü' 
                    || input.charAt(i) == 'Ä' 
                    || input.charAt(i) == 'Ö'
                    || input.charAt(i) == '/' 
                    || input.charAt(i) == '&' 
                    || input.charAt(i) == 'X') {
                return null;
            }

        }
        return encrypt(input);
    }
}