/**
 * connection.h: This contains the connection_t structure.
 *
 * Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team
 * Rights to this code are as documented in COPYING.
 *
 *
 * Portions of this file were derived from sources bearing the following license:
 * Copyright © 2005 Atheme Development Group
 * Rights to this code are as documented in doc/pod/license.pod.
 *
 * $Id: connection.h,v 1.8 2007/09/22 14:27:26 pippijn Exp $
 */

#ifndef CONNECTION_H
#define CONNECTION_H

#include <deque>

#include <util/containers.h>
#include <ermyth/callback.h>

#define SENDQSIZE (4096 - 40)

/* packetqueue struct */
struct packetqueue : zero_initialised
{
  node_t node;
  int firstused;		/* offset of first used byte */
  int firstfree;		/* 1 + offset of last used byte */
  char buf[SENDQSIZE];

  packetqueue ()
  : firstused (0), firstfree (0)
  {
  }
};

enum connection_flag
{
  CF_UPLINK     = 1 << 0,
  CF_DCCOUT     = 1 << 1,
  CF_DCCIN      = 1 << 2,
  
  CF_CONNECTING = 1 << 3,
  CF_LISTENING  = 1 << 4,
  CF_CONNECTED  = 1 << 5,
  CF_DEAD       = 1 << 6,
  
  CF_NONEWLINE  = 1 << 7,
  CF_SEND_EOF   = 1 << 8,     /* shutdown(2) write end if sendque empty */
  CF_SEND_DEAD  = 1 << 9      /* write end shut down */
};

class connection_t : public object, public zero_initialised
{
  void _destroy ()
  {
    delete this;
  }

  struct callbacks
  {
    functor::callback1<connection_t *> connected;
  };

public:
  unsigned flags;

  bool is_uplink     () { return flags & CF_UPLINK;              }
  bool is_dcc        () { return flags & (CF_DCCOUT | CF_DCCIN); }
  bool is_dccout     () { return flags & CF_DCCOUT;              }
  bool is_dccin      () { return flags & CF_DCCIN;               }
  bool is_dead       () { return flags & CF_DEAD;                }
  bool is_connecting () { return flags & CF_CONNECTING;          }
  bool is_listening  () { return flags & CF_LISTENING;           }

public:
  unsigned index; // for list_type
  typedef indexing_vector<connection_t> list_type;
  static list_type list;

public:

  typedef std::deque<packetqueue *> queue;

  char name[HOSTLEN];
  char hbuf[BUFSIZE + 1];

  queue recvq;
  queue sendq;

  int fd;
  int pollslot;

  time_t first_recv;
  time_t last_recv;

  struct sockaddr_in *sa;
  struct sockaddr saddr;
  unsigned int saddr_size;

  void (*read_handler) (connection_t *);
  void (*write_handler) (connection_t *);

  void (*recvq_handler) (connection_t *);
  void (*close_handler) (connection_t *);
  connection_t *listener;
  void *userdata;

  static callbacks callback;

public:
  static connection_t *create (char const * const name, int fd, unsigned int flags,
                               void (*read_handler) (connection_t *), void (*write_handler) (connection_t *));
  static connection_t *open_tcp (char const * const host, char const * const vhost, unsigned int port,
                                 void (*read_handler) (connection_t *), void (*write_handler) (connection_t *));
  static connection_t *open_listener_tcp (char const * const host, unsigned int port, void (*read_handler) (connection_t *));
  static connection_t *accept_tcp (connection_t *, void (*)(connection_t *), void (*)(connection_t *));

  void setselect (connection_t *cptr, void (*)(connection_t *), void (*)(connection_t *));
  void close ();
  void close_soon ();
  void close_soon_children ();
  static void close_all (void);
  static void stats (void (*)(char const *, void *), void *);
  void write (char *format, ...);
  void write_raw (char *data);
  static connection_t *find (int);
  static void select (time_t delay);
  static int count (void);
};

#endif