/*
    SPDX-FileCopyrightText: 2010 Joris Guisson <joris.guisson@gmail.com>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#ifndef NET_SERVERSOCKET_H
#define NET_SERVERSOCKET_H

#include <QObject>
#include <QSharedPointer>
#include <ktorrent_export.h>
#include <util/bufferpool.h>
#include <util/constants.h>

namespace net
{
class Address;

/**
    Convenience class to create and bind a server socket.
    Internally it combines a QSocketNotifier and a net::Socket.
*/
class KTORRENT_EXPORT ServerSocket : public QObject
{
    Q_OBJECT
public:
    typedef QSharedPointer<ServerSocket> Ptr;

    /**
        Interface class to handle new connections
        from a ServerSocket.
    */
    class KTORRENT_EXPORT ConnectionHandler
    {
    public:
        virtual ~ConnectionHandler()
        {
        }

        /**
            A new connection has been accepted
            @param fd The filedescriptor of the connection
            @param addr The address of the connection
        */
        virtual void newConnection(int fd, const net::Address &addr) = 0;
    };

    /**
        Interface class to handle data from a ServerSocket
    */
    class KTORRENT_EXPORT DataHandler
    {
    public:
        virtual ~DataHandler()
        {
        }

        /**
            An UDP packet was received
            @param data The packet
            @param addr The address from which it was received
        */
        virtual void dataReceived(bt::Buffer::Ptr buffer, const net::Address &addr) = 0;

        /**
            Socket has become writeable
            @param sock The socket
        */
        virtual void readyToWrite(net::ServerSocket *sock) = 0;
    };

    /**
        Create a TCP server socket
        @param chandler The connection handler
    */
    ServerSocket(ConnectionHandler *chandler);

    /**
        Create an UDP server socket
        @param dhandler The data handler
    */
    ServerSocket(DataHandler *dhandler);

    ~ServerSocket() override;

    /**
        Bind the socket to an IP and port
        @param ip The IP address
        @param port The port number
        @return true upon success, false otherwise
    */
    bool bind(const QString &ip, bt::Uint16 port);

    /**
        Bind the socket to an address
        @param addr The address
        @return true upon success, false otherwise
    */
    bool bind(const net::Address &addr);

    /**
        Method to send data with the socket. Only use this when
        the socket is a UDP socket. It will fail for TCP server sockets.
        @param data The data to send
        @param addr The address to send to
        @return The number of bytes sent
    */
    int sendTo(const QByteArray &data, const net::Address &addr);

    /**
        Method to send data with the socket. Only use this when
        the socket is a UDP socket. It will fail for TCP server sockets.
        @param buf The data to send
        @param size The size of the data
        @param addr The address to send to
        @return The number of bytes sent
    */
    int sendTo(const bt::Uint8 *buf, int size, const net::Address &addr);

    /**
        Enable write notifications.
        @param on On or not
    */
    void setWriteNotificationsEnabled(bool on);

    /**
        Enable read notifications.
        @param on On or not
    */
    void setReadNotificationsEnabled(bool on);

    /**
        Set the TOS byte of the socket
        @param type_of_service Value to set
        @return true upon success, false otherwise
    */
    bool setTOS(unsigned char type_of_service);

private Q_SLOTS:
    void readyToAccept(int fd);
    void readyToRead(int fd);
    void readyToWrite(int fd);

private:
    class Private;
    Private *d;
};

}

#endif // NET_SERVERSOCKET_H
