/*
 * This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Affero General Public License as published by the
 * Free Software Foundation; either version 3 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "Realm.h"
#include "IpNetwork.h"
#include <boost/asio/ip/tcp.hpp>
#include <memory> // NOTE: this import is NEEDED (even though some IDEs report it as unused)

boost::asio::ip::tcp_endpoint Realm::GetAddressForClient(boost::asio::ip::address const& clientAddr) const
{
    boost::asio::ip::address realmIp;

    // Attempt to send best address for a client
    if (clientAddr.is_loopback())
    {
        // Try guessing if realm is also connected locally
        if (LocalAddress->is_loopback() || ExternalAddress->is_loopback())
        {
            realmIp = clientAddr;
        }
        else
        {
            // Assume that user connecting from the machine that bnetserver is located on
            // has all realms available in his local network
            realmIp = *LocalAddress;
        }
    }
    else
    {
        if (clientAddr.is_v4() && Acore::Net::IsInNetwork(LocalAddress->to_v4(), LocalSubnetMask->to_v4(), clientAddr.to_v4()))
        {
            realmIp = *LocalAddress;
        }
        else
        {
            realmIp = *ExternalAddress;
        }
    }

    // Return external IP
    return { realmIp, Port };
}