/***************************************************************************
 *   Copyright (C) 2006 by Gerd v. Egidy                                   *
 *   gve@intra2net.com                                                     *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU Lesser General Public License version   *
 *   2.1 as published by the Free Software Foundation.                     *
 *                                                                         *
 *   This library 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 Lesser General Public License for more details.                   *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this program; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#ifndef __LIBT2N_SERVER
#define __LIBT2N_SERVER

#include <iostream>
#include <string>
#include <map>

#include "connection.hxx"
#include "types.hxx"

namespace libt2n
{

class server;

/**
    @brief connection on a server

    on a server every connection to a client is represented as server_connection.
    a server_connection is abstract, derived classes like socket_server_connection are used.
*/
class server_connection : public connection
{
    friend class server;

    private:
        int timeout;
        int last_action_time;
        unsigned int connection_id;

        void set_server(server* _my_server)
            { my_server=_my_server; }

        void set_id(unsigned int _connection_id)
            { connection_id=_connection_id; }

    protected:
        server_connection(int _timeout)
            : connection()
        {
            set_timeout(_timeout);
            reset_timeout();
            connection_id=0;
            my_server=0;
        }

        server *my_server;

    public:
        /// check if timeout is expired, close connection if so
        void check_timeout();

        /// reset the timeout, e.g. if something is received
        void reset_timeout();

        void set_timeout(int _timeout)
            { timeout=_timeout; }

        /// get the id of this connection within the server object
        unsigned int get_id()
            { return connection_id; }
};

/**
    @brief server base class

    constitutes a server. is abstract, use derived classes like socket_server.
*/
class server
{
    private:
        int default_timeout;
        log_level_values log_level;
        std::ostream *logstream;

        unsigned int next_id;

    protected:
        std::map<unsigned int, server_connection*> connections;

        server()
        {
            set_default_timeout(30);
            set_logging(NULL,none);
            next_id=1;
        }

        virtual bool fill_connection_buffers(void)=0;

        int add_connection(server_connection* newconn);

    public:
        virtual ~server();

        /// set the default timeout for new client connections
        void set_default_timeout(int _default_timeout)
            { default_timeout=_default_timeout; }

        /// get the current default timeout for client connections
        int get_default_timeout(void)
            { return default_timeout; }

        /// activate logging to the given stream. everything above the given level is logged.
        void set_logging(std::ostream *_logstream, log_level_values _log_level)
        {
            log_level=_log_level;
            logstream=_logstream;
        }

        server_connection* get_connection(unsigned int conn_id);

        /** @brief look for new data on all open connections, accept new connections
            @param usec_timeout wait until new data is found, max timeout usecs.
                  -1: wait endless
                   NULL: no timeout
            @retval true if new data was found (does not mean that the received data 
                    is a complete packet though)
        */
        virtual bool fill_buffer(long long usec_timeout=-1)=0;

        void cleanup();

        /** @brief get a complete data packet from any client. The packet is removed from the
                   connection buffer.
            @param[out] data the data package
            @retval true if packet found
        */
        bool get_packet(std::string& data)
            { unsigned int x; return get_packet(data,x); }

        /** @brief get a complete data packet from any client. The packet is removed from the
                   connection buffer.
            @param[out] data the data package
            @param[out] conn_id the connection id we got this packet from
            @retval true if packet found
        */
        bool get_packet(std::string& data, unsigned int& conn_id);

        /// write a message to the log if logging is enabled
        void log(log_level_values level, const std::string& message)
            { log(level,message.c_str()); }
        /// write a message to the log if logging is enabled
        void log(log_level_values level, const char* message);
};

}

#endif