#include "i2-base.h"

using namespace icinga;

Socket::CollectionType Socket::Sockets;

Socket::Socket(void)
{
	m_FD = INVALID_SOCKET;
}

Socket::~Socket(void)
{
	CloseInternal(true);
}

void Socket::Start(void)
{
	assert(m_FD != INVALID_SOCKET);

	OnException += bind_weak(&Socket::ExceptionEventHandler, shared_from_this());

	Sockets.push_back(static_pointer_cast<Socket>(shared_from_this()));
}

void Socket::Stop(void)
{
	Sockets.remove_if(weak_ptr_eq_raw<Socket>(this));
}

void Socket::SetFD(SOCKET fd)
{
	unsigned long lTrue = 1;

	if (fd != INVALID_SOCKET)
		ioctlsocket(fd, FIONBIO, &lTrue);

	m_FD = fd;
}

SOCKET Socket::GetFD(void) const
{
	return m_FD;
}

void Socket::Close(void)
{
	CloseInternal(false);
}

void Socket::CloseInternal(bool from_dtor)
{
	if (m_FD == INVALID_SOCKET)
		return;

	closesocket(m_FD);
	m_FD = INVALID_SOCKET;

	/* nobody can possibly have a valid event subscription when the
		destructor has been called */
	if (!from_dtor) {
		Stop();

		EventArgs ea;
		ea.Source = shared_from_this();
		OnClosed(ea);
	}
}

void Socket::HandleSocketError(void)
{
	int opt;
	socklen_t optlen = sizeof(opt);

	int rc = getsockopt(GetFD(), SOL_SOCKET, SO_ERROR, (char *)&opt, &optlen);

	if (rc >= 0 && opt != 0) {
		SocketErrorEventArgs sea;
		sea.Code = opt;
#ifdef _WIN32
		sea.Message = Win32Exception::FormatErrorCode(sea.Code);
#else /* _WIN32 */
		sea.Message = PosixException::FormatErrorCode(sea.Code);
#endif /* _WIN32 */
		OnError(sea);
	}

	Close();
	return;
}

int Socket::ExceptionEventHandler(const EventArgs& ea)
{
	HandleSocketError();

	return 0;
}

bool Socket::WantsToRead(void) const
{
	return false;
}

bool Socket::WantsToWrite(void) const
{
	return false;
}

string Socket::GetAddressFromSockaddr(sockaddr *address, socklen_t len)
{
	char host[NI_MAXHOST];
	char service[NI_MAXSERV];

	if (getnameinfo(address, len, host, sizeof(host), service, sizeof(service), NI_NUMERICHOST | NI_NUMERICSERV) < 0)
		throw InvalidArgumentException(); /* TODO: throw proper exception */

	stringstream s;
	s << "[" << host << "]:" << service;
	return s.str();
}

string Socket::GetClientAddress(void)
{
	sockaddr_storage sin;
	socklen_t len = sizeof(sin);

	if (getsockname(GetFD(), (sockaddr *)&sin, &len) < 0) {
		HandleSocketError();

		return string();
	}

	return GetAddressFromSockaddr((sockaddr *)&sin, len);
}

string Socket::GetPeerAddress(void)
{
	sockaddr_storage sin;
	socklen_t len = sizeof(sin);

	if (getpeername(GetFD(), (sockaddr *)&sin, &len) < 0) {
		HandleSocketError();

		return string();
	}

	return GetAddressFromSockaddr((sockaddr *)&sin, len);
}