/**
 * \file
 * Abstraction layer above BSD sockets. Capsules and simplifies connect
 * accept and listen for TCP and UDP sockets.
 * It also provides a mostly unified interface to both types of sockets.
 *
 * \author	Georg Hopp
 *
 * \copyright
 * Copyright © 2014 Georg Hopp
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef __TR_SOCKET_H__
#define __TR_SOCKET_H__

#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>

//#include <arpa/inet.h>  // for in_port_t

#include "trbase.h"
//#include "tr/interface/socket.h"
#include "tr/logger.h"

#define TR_UDP_MAX_READ_BLOCK	8 * 1024
#define TR_TCP_MAX_READ_BLOCK	256 * 1024

typedef enum TR_e_socket_fin {
	TR_FIN_NO   = 0,
	TR_FIN_RD   = 1,
	TR_FIN_WR   = 2,
	TR_FIN_RDWR = 3
} TR_SocketFin;

#define TR_MAX_HOST		256
#define TR_MAX_CNAME	512

TR_CLASS(TR_Socket) {
	TR_Logger    log;
	int          flags;
	int          type;
	char         host[TR_MAX_HOST];
	char         cname[TR_MAX_CNAME];
	int          port;
	time_t       ttl;
	union {
		struct sockaddr     info;
		struct sockaddr_in  in;
		struct sockaddr_in6 in6;
	}            addr;
	socklen_t    addrlen;
	int          handle;
	TR_SocketFin fin_state;
	int          fd_getter;
};
TR_INSTANCE_INIT(TR_Socket);
TR_CLASSVARS_DECL(TR_Socket) {};

#define TR_socketLog(socket)      ((socket)->log)
#define TR_socketFlags(socket)    ((socket)->flags)
#define TR_socketType(socket)     ((socket)->type)
#define TR_socketHost(socket)     ((socket)->host)
#define TR_socketPort(socket)     ((socket)->port)
#define TR_socketCname(socket)    ((socket)->cname)
#define TR_socketTtl(socket)      ((socket)->ttl)
#define TR_socketAddr(socket)     ((void *)&(socket)->addr)
#define TR_socketAddrlen(socket)  ((socket)->addrlen)
#define TR_socketHandle(socket)   ((socket)->handle)
#define TR_socketFinState(socket) ((socket)->fin_state)
#define TR_socketFdGetter(socket) ((socket)->fd_getter)
#define TR_socketFinRd(socket) \
	((TR_socketFinState(socket) & TR_FIN_RD) == TR_FIN_RD)
#define TR_socketFinWr(socket) \
	((TR_socketFinState(socket) & TR_FIN_WR) == TR_FIN_WR)
#define TR_socketFinRdWr(socket) \
	((TR_socketFinState(socket) & TR_FIN_RDWR) == TR_FIN_RDWR)

#define TR_socketAddrPort(socket)                \
	((socket)->addr.info.sa_family == AF_INET    \
	 ? ntohs((socket)->addr.in.sin_port)         \
	 : (socket)->addr.info.sa_family == AF_INET6 \
	 ? ntohs((socket)->addr.in6.sin6_port)       \
	 : 0)

#define TR_socketAddrIp(socket)                      \
	((socket)->addr.info.sa_family == AF_INET        \
	 ? (void *)&(socket)->addr.in.sin_addr.s_addr    \
	 : (socket)->addr.info.sa_family == AF_INET6     \
	 ? (void *)&(socket)->addr.in6.sin6_addr.s6_addr \
	 : NULL)

#define TR_socketAddrIplen(socket)                   \
	((socket)->addr.info.sa_family == AF_INET        \
	 ? sizeof((socket)->addr.in.sin_addr)            \
	 : (socket)->addr.info.sa_family == AF_INET6     \
	 ? sizeof((socket)->addr.in6.sin6_addr)          \
	 : 0)

#define TR_socketAddrIpStr(socket, buffer, nbuffer) \
	if (TR_socketAddrIp((socket)))                  \
		inet_ntop(                                  \
				(socket)->addr.info.sa_family,      \
				TR_socketAddrIp((socket)),          \
				buffer, nbuffer)

TR_CLASS(TR_TcpSocket) {
	TR_EXTENDS(TR_Socket);
	int connected;
};
TR_INSTANCE_INIT(TR_TcpSocket);
TR_CLASSVARS_DECL(TR_TcpSocket) {};

TR_CLASS(TR_UdpSocket) {
	TR_EXTENDS(TR_Socket);
};
TR_INSTANCE_INIT(TR_UdpSocket);
TR_CLASSVARS_DECL(TR_UdpSocket) {};

typedef int (* TR_socketAction_fptr)(void *);

int          TR_socketInit(TR_Socket, TR_socketAction_fptr);
TR_SocketFin TR_socketShutdownRead(TR_Socket);
TR_SocketFin TR_socketShutdownWrite(TR_Socket);
TR_SocketFin TR_socketShutdown(TR_Socket);
void         TR_socketClose(TR_Socket);
void         TR_socketNonblock(TR_Socket);

#define TR_socketBind(socket) \
	(TR_socketInit((socket), TR_socketBindAction))

TR_TcpSocket TR_socketAccept(TR_TcpSocket);

#define TR_socketConnect(socket) \
	(TR_socketInit((socket), TR_socketConnectAction))

#define TR_socketOpen(socket) \
	(TR_socketInit((socket), NULL))

void TR_socketPair(TR_Socket[2], int);
void TR_socketSendFd(TR_Socket, int);
int  TR_socketGetFd(TR_Socket);

#endif // __TR_SOCKET_H__

// vim: set ts=4 sw=4: