/***************************************************************************
 *   Copyright (C) 2010 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_POLL_H
#define NET_POLL_H

#include <map>
#include <vector>
#include <QSharedPointer>
#include <util/constants.h>
#include <ktorrent_export.h>

#ifdef Q_WS_WIN
#include <util/win32.h>
#endif

struct pollfd;

namespace net
{

/**
    Client for a Poll
*/
class KTORRENT_EXPORT PollClient
{
public:
    PollClient() {}
    virtual ~PollClient() {}

    /// Get the filedescriptor to poll
    virtual int fd() const = 0;

    /// Handle data
    virtual void handleData() = 0;

    /// Reset the client called after poll finishes
    virtual void reset() = 0;

    typedef QSharedPointer<PollClient> Ptr;
};

/**
    Class which does polling of sockets
*/
class KTORRENT_EXPORT Poll
{
public:
    Poll();
    virtual ~Poll();

    enum Mode {
        INPUT, OUTPUT
    };

    /// Add a file descriptor to the poll (returns the index of it)
    int add(int fd, Mode mode);

    /// Add a poll client
    int add(PollClient::Ptr pc);

    /// Poll all sockets
    int poll(int timeout = -1);

    /// Check if a socket at an index is read
    bool ready(int index, Mode mode) const;

    /// Reset the poll
    void reset();

private:
    std::vector<struct pollfd> fd_vec;
    bt::Uint32 num_sockets;
    std::map<int, PollClient::Ptr> poll_clients;
};

}

#endif // NET_POLL_H
