/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2012-2016 Symless Ltd.
 * Copyright (C) 2002 Chris Schoeneman
 *
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 *
 * This package 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/>.
 */

#pragma once

#include "arch/IArchMultithread.h"
#include "arch/IArchNetwork.h"

#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#else
struct sockaddr_storage {
  unsigned char ss_len;    /* address length */
  unsigned char ss_family; /* [XSI] address family */
  char __ss_pad1[_SS_PAD1SIZE];
  long long __ss_align; /* force structure storage alignment */
  char __ss_pad2[_SS_PAD2SIZE];
};
#endif

#if !HAVE_SOCKLEN_T
typedef int socklen_t;
#endif

#if HAVE_POLL
#include <poll.h>
#else
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#endif

// old systems may use char* for [gs]etsockopt()'s optval argument.
// this should be void on modern systems but char is forwards
// compatible so we always use it.
typedef char optval_t;

#define ARCH_NETWORK ArchNetworkBSD
#define TYPED_ADDR(type_, addr_) (reinterpret_cast<type_ *>(&addr_->m_addr))

class ArchSocketImpl {
public:
  int m_fd;
  int m_refCount;
};

class ArchNetAddressImpl {
public:
  ArchNetAddressImpl() : m_len(sizeof(m_addr)) {}

public:
  struct sockaddr_storage m_addr;
  socklen_t m_len;
};

//! Berkeley (BSD) sockets implementation of IArchNetwork
class ArchNetworkBSD : public IArchNetwork {
public:
  ArchNetworkBSD();
  ArchNetworkBSD(ArchNetworkBSD const &) = delete;
  ArchNetworkBSD(ArchNetworkBSD &&) = delete;
  virtual ~ArchNetworkBSD();

  ArchNetworkBSD &operator=(ArchNetworkBSD const &) = delete;
  ArchNetworkBSD &operator=(ArchNetworkBSD &&) = delete;

  virtual void init();

  // IArchNetwork overrides
  virtual ArchSocket newSocket(EAddressFamily, ESocketType);
  virtual ArchSocket copySocket(ArchSocket s);
  virtual void closeSocket(ArchSocket s);
  virtual void closeSocketForRead(ArchSocket s);
  virtual void closeSocketForWrite(ArchSocket s);
  virtual void bindSocket(ArchSocket s, ArchNetAddress addr);
  virtual void listenOnSocket(ArchSocket s);
  virtual ArchSocket acceptSocket(ArchSocket s, ArchNetAddress *addr);
  virtual bool connectSocket(ArchSocket s, ArchNetAddress name);
  virtual int pollSocket(PollEntry[], int num, double timeout);
  virtual void unblockPollSocket(ArchThread thread);
  virtual size_t readSocket(ArchSocket s, void *buf, size_t len);
  virtual size_t writeSocket(ArchSocket s, const void *buf, size_t len);
  virtual void throwErrorOnSocket(ArchSocket);
  virtual bool setNoDelayOnSocket(ArchSocket, bool noDelay);
  virtual bool setReuseAddrOnSocket(ArchSocket, bool reuse);
  virtual std::string getHostName();
  virtual ArchNetAddress newAnyAddr(EAddressFamily);
  virtual ArchNetAddress copyAddr(ArchNetAddress);
  virtual std::vector<ArchNetAddress> nameToAddr(const std::string &);
  virtual void closeAddr(ArchNetAddress);
  virtual std::string addrToName(ArchNetAddress);
  virtual std::string addrToString(ArchNetAddress);
  virtual EAddressFamily getAddrFamily(ArchNetAddress);
  virtual void setAddrPort(ArchNetAddress, int port);
  virtual int getAddrPort(ArchNetAddress);
  virtual bool isAnyAddr(ArchNetAddress);
  virtual bool isEqualAddr(ArchNetAddress, ArchNetAddress);

  struct Connectors {
#if HAVE_POLL
    int (*poll_impl)(struct pollfd *, nfds_t, int);
#endif // HAVE_POLL
    Connectors() {
#if HAVE_POLL
      poll_impl = poll;
#endif // HAVE_POLL
    }
  };
  static Connectors s_connectors;

private:
  const int *getUnblockPipe();
  const int *getUnblockPipeForThread(ArchThread);
  void setBlockingOnSocket(int fd, bool blocking);
  void throwError(int);
  void throwNameError(int);

private:
  ArchMutex m_mutex{};
};