/***************************************************************************
 *   Copyright (C) 2011 by Joris Guisson                                   *
 *   joris.guisson@gmail.com                                               *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
 ***************************************************************************/


#ifndef NET_ADDRESSRESOLVER_H
#define NET_ADDRESSRESOLVER_H

#include <QHostInfo>
#include <ktorrent_export.h>
#include <net/address.h>

namespace net
{

/**
 * Resolves hostnames into net::Address objects.
 * This class will clean itself up, after it is done using deleteLater.
 **/
class KTORRENT_EXPORT AddressResolver : public QObject
{
    Q_OBJECT
public:
    /**
     * Constructor, initializer the lookup.
     * @param host Hostname
     * @param port Port number
     * @param parent Parent
     * @param slot Slot of parent to connect to
     **/
    AddressResolver(const QString & host, bt::Uint16 port, QObject* parent, const char* slot);
    ~AddressResolver() override;

    /// Did the resolver succeed ?
    bool succeeded() const
    {
        return succesfull;
    }

    /// Get the resulting address
    const net::Address & address() const
    {
        return result;
    }

    /**
     * Convenience method to resolve a hostname.
     * @param host Hostname
     * @param port Port number
     * @param parent Parent
     * @param slot Slot of parent to connect to
     * @return void
     **/
    static void resolve(const QString & host, bt::Uint16 port, QObject* parent, const char* slot);

    /**
     * Synchronous resolve
     * @param host Hostname
     * @param port Port number
     * @return :Address
     **/
    static net::Address resolve(const QString & host, bt::Uint16 port);

Q_SIGNALS:
    /**
     * Emitted when hostname lookup succeeded
     * @param ar This AddressResolver
     **/
    void resolved(net::AddressResolver* ar);

private Q_SLOTS:
    void hostResolved(const QHostInfo & res);

private:
    int lookup_id;
    net::Address result;
    bool succesfull;
    bool ongoing;
};

}

#endif // NET_ADDRESSRESOLVER_H
