package com.awkj;

import java.math.BigInteger;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class App {

    private static BigInteger MIN_IP = new BigInteger("0");
    private static BigInteger MAX_IP = new BigInteger("4294967295");

    static String inet_ntoa(BigInteger raw) {
        int minFlag = raw.compareTo(MIN_IP);
        int maxFlag = raw.compareTo(MAX_IP);
        if (minFlag < 0 || maxFlag > 0) {
            return null;
        } else {
            try {
                long rawLong = raw.longValue();
                byte[] b = new byte[]{(byte) (rawLong >> 24),
                        (byte) (rawLong >> 16),
                        (byte) (rawLong >> 8),
                        (byte) rawLong};
                return InetAddress.getByAddress(b).getHostAddress();
            } catch (UnknownHostException e) {
                e.printStackTrace();
                return null;
            }
        }

    }

    public static void main(String[] args) {
        /*
        MYSQL result:
        SELECT
        INET_NTOA(-1); --> NULL

        SELECT
        INET_NTOA(0);  --> 0.0.0.0

        SELECT
        INET_NTOA(134744072);  --> 8.8.8.8

        SELECT
        INET_NTOA(4294967295);  --> 255.255.255.255

        SELECT
        INET_ATON(4294967296);  --> NULL
        */

        System.out.println(inet_ntoa(new BigInteger("-1")));
        System.out.println(inet_ntoa(new BigInteger("0")));
        System.out.println(inet_ntoa(new BigInteger("134744072")));
        System.out.println(inet_ntoa(new BigInteger("4294967295")));
        System.out.println(inet_ntoa(new BigInteger("4294967296")));
    }
}