package com.software.berater.test;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by bileser on 06.10.15.
 */
public class RandomPasswordGenerator {

    private String newPassword = "";
    private static final String DIGITS = "123456789";
    private static final String LOCASE_CHARACTERS = "abcdefghjkmnpqrstuvwxyz";
    private static final String UPCASE_CHARACTERS = "ABCDEFGHJKMNPQRSTUVWXYZ";
    private static final String SYMBOLS = "-_;:()%&$§";
    private static java.util.Random r = new java.util.Random();

    public String getNewPassword(int maxLength) {
        if (maxLength < 4){
            maxLength = 4;
        }
        List<String> pools = new ArrayList<String>();
        pools.add(RandomPasswordGenerator.DIGITS);
        pools.add(RandomPasswordGenerator.LOCASE_CHARACTERS);
        pools.add(RandomPasswordGenerator.UPCASE_CHARACTERS);
        pools.add(RandomPasswordGenerator.SYMBOLS);
        StringBuilder sb = new StringBuilder();

        while (sb.length() != maxLength){
            for (String pool : pools){
                boolean takeChar = false;
                char charCandidate = 'a';
                while (!takeChar){
                    char[] charPool = pool.toCharArray();
                    charCandidate = charPool[r.nextInt(charPool.length)];
                    if (charCandidate == 'l' && sb.toString().contains("1")){
                    } else if (charCandidate == 'O' && sb.toString().contains("0")){
                    } else {
                        takeChar = true;
                    }
                }
                sb.append(charCandidate);
                if (sb.length() == maxLength){
                    return sb.toString();
                }
            }
        }
        return null;
    }
}