package com.eu.habbo.util;

import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;

public class HexUtils {

    private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();

    public static String toHex(byte[] bytes) {
        char[] hexChars = new char[bytes.length * 2];
        for (int j = 0; j < bytes.length; j++) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 2] = HEX_ARRAY[v >>> 4];
            hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
        }
        return new String(hexChars);
    }

    public static byte[] toBytes(String hexString) {
        int len = hexString.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            data[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4)
                    + Character.digit(hexString.charAt(i+1), 16));
        }
        return data;
    }

    public static String getRandom(int length){
        Random r = ThreadLocalRandom.current();
        StringBuilder sb = new StringBuilder();

        while(sb.length() < length){
            sb.append(Integer.toHexString(r.nextInt()));
        }

        return sb.toString().substring(0, length);
    }

}