#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules

#include "Socket.h"

#ifndef _WIN32
	#include <netdb.h>
	#include <unistd.h>
	#include <arpa/inet.h>		//inet_ntoa()
#else
	#define socklen_t int
#endif





cSocket::cSocket(xSocket a_Socket)
	: m_Socket(a_Socket)
{
}





cSocket::~cSocket()
{
	// Do NOT close the socket; this class is an API wrapper, not a RAII!
}





cSocket::operator cSocket::xSocket() const
{
	return m_Socket;
}





cSocket::xSocket cSocket::GetSocket() const
{
	return m_Socket;
}





bool cSocket::IsValidSocket(cSocket::xSocket a_Socket)
{
	#ifdef _WIN32
	return (a_Socket != INVALID_SOCKET);
	#else  // _WIN32
	return (a_Socket >= 0);
	#endif  // else _WIN32
}





void cSocket::CloseSocket()
{
	#ifdef _WIN32
	
	closesocket(m_Socket);
	
	#else  // _WIN32
	
	if (shutdown(m_Socket, SHUT_RDWR) != 0)//SD_BOTH);
	{
		LOGWARN("Error on shutting down socket (%s): %s", m_IPString.c_str(), GetLastErrorString().c_str());
	}
	if (close(m_Socket) != 0)
	{
		LOGWARN("Error closing socket (%s): %s", m_IPString.c_str(), GetLastErrorString().c_str());
	}
	
	#endif  // else _WIN32

	// Invalidate the socket so that this object can be re-used for another connection
	m_Socket = INVALID_SOCKET;
}





AString cSocket::GetErrorString( int a_ErrNo )
{
	char buffer[ 1024 ];
	AString Out;

	#ifdef _WIN32

	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, a_ErrNo, 0, buffer, ARRAYCOUNT(buffer), NULL);
	Printf(Out, "%d: %s", a_ErrNo, buffer);
	if (!Out.empty() && (Out[Out.length() - 1] == '\n'))
	{
		Out.erase(Out.length() - 2);
	}
	return Out;
	
	#else  // _WIN32
	
	// According to http://linux.die.net/man/3/strerror_r there are two versions of strerror_r():
	
	#if ( _GNU_SOURCE ) && !defined(ANDROID_NDK)  // GNU version of strerror_r()
	
	char * res = strerror_r( errno, buffer, ARRAYCOUNT(buffer) );
	if( res != NULL )
	{
		Printf(Out, "%d: %s", a_ErrNo, res);
		return Out;
	}
	
	#else  // XSI version of strerror_r():
	
	int res = strerror_r( errno, buffer, ARRAYCOUNT(buffer) );
	if( res == 0 )
	{
		Printf(Out, "%d: %s", a_ErrNo, buffer);
		return Out;
	}
	
	#endif  // strerror_r() version
	
	else
	{
		Printf(Out, "Error %d while getting error string for error #%d!", errno, a_ErrNo);
		return Out;
	}
	
	#endif  // else _WIN32
}




int cSocket::GetLastError()
{
#ifdef _WIN32
	return WSAGetLastError();
#else
	return errno;
#endif
}





bool cSocket::SetReuseAddress(void)
{
	#if defined(_WIN32) || defined(ANDROID_NDK)
		char yes = 1;
	#else
		int yes = 1;
	#endif
	return (setsockopt(m_Socket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == 0);
}





int cSocket::WSAStartup()
{
#ifdef _WIN32
	WSADATA wsaData;
	memset(&wsaData, 0, sizeof(wsaData));
	return ::WSAStartup(MAKEWORD(2, 2),&wsaData);
#else
	return 0;
#endif
}





cSocket cSocket::CreateSocket(eFamily a_Family)
{
	return socket((int)a_Family, SOCK_STREAM, 0);
}





unsigned long cSocket::INTERNET_ADDRESS_LOCALHOST(void)
{
	static unsigned long LocalHost = 0;
	if (LocalHost == 0)
	{
		LocalHost = inet_addr("127.0.0.1");  // GCC won't accept this as a global var assignment
	}
	return LocalHost;
}





bool cSocket::BindToAnyIPv4(unsigned short a_Port)
{
	sockaddr_in local;
	memset(&local, 0, sizeof(local));

	local.sin_family = AF_INET;
	local.sin_port = htons((u_short)a_Port);

	return (bind(m_Socket, (sockaddr *)&local, sizeof(local)) == 0);
}





bool cSocket::BindToAnyIPv6(unsigned short a_Port)
{
	// Cannot use socckaddr_in6, because it is not defined in the default VS2008 SDK
	// Must jump through hoops here
	
	sockaddr_in6 local;
	memset(&local, 0, sizeof(local));

	local.sin6_family = AF_INET6;
	local.sin6_port = htons((u_short)a_Port);

	return (bind(m_Socket, (sockaddr *)&local, sizeof(local)) == 0);
}





bool cSocket::BindToLocalhostIPv4(unsigned short a_Port)
{
	sockaddr_in local;
	memset(&local, 0, sizeof(local));

	local.sin_family = AF_INET;;
	local.sin_addr.s_addr = INTERNET_ADDRESS_LOCALHOST();
	local.sin_port = htons((u_short)a_Port);

	return (bind(m_Socket, (sockaddr*)&local, sizeof(local)) == 0);
}





bool cSocket::Listen(int a_Backlog)
{
	return (listen(m_Socket, a_Backlog) == 0);
}





cSocket cSocket::AcceptIPv4(void)
{
	sockaddr_in from;
	socklen_t fromlen = sizeof(from);

	cSocket SClient = accept(m_Socket, (sockaddr *)&from, &fromlen);

	if (SClient.IsValid() && (from.sin_addr.s_addr != 0))  // Get IP in string form
	{
		SClient.m_IPString = inet_ntoa(from.sin_addr);
	}
	return SClient;
}





cSocket cSocket::AcceptIPv6(void)
{
	sockaddr_in6 from;
	socklen_t fromlen = sizeof(from);

	cSocket SClient = accept(m_Socket, (sockaddr *)&from, &fromlen);

	// Get IP in string form:
	if (SClient.IsValid())
	{
		#if defined(_WIN32)
			// Windows XP doesn't have inet_ntop, so we need to improvise. And MSVC has different headers than GCC
			#ifdef _MSC_VER
				// MSVC version
				Printf(SClient.m_IPString, "%x:%x:%x:%x:%x:%x:%x:%x", 
					from.sin6_addr.u.Word[0],
					from.sin6_addr.u.Word[1],
					from.sin6_addr.u.Word[2],
					from.sin6_addr.u.Word[3],
					from.sin6_addr.u.Word[4],
					from.sin6_addr.u.Word[5],
					from.sin6_addr.u.Word[6],
					from.sin6_addr.u.Word[7]
				);
			#else  // _MSC_VER
				// MinGW
				Printf(SClient.m_IPString, "%x:%x:%x:%x:%x:%x:%x:%x", 
					from.sin6_addr.s6_addr16[0],
					from.sin6_addr.s6_addr16[1],
					from.sin6_addr.s6_addr16[2],
					from.sin6_addr.s6_addr16[3],
					from.sin6_addr.s6_addr16[4],
					from.sin6_addr.s6_addr16[5],
					from.sin6_addr.s6_addr16[6],
					from.sin6_addr.s6_addr16[7]
				);
			#endif  // else _MSC_VER
		#else
			char buffer[INET6_ADDRSTRLEN];
			inet_ntop(AF_INET6, &(from.sin6_addr), buffer, sizeof(buffer));
			SClient.m_IPString.assign(buffer);
		#endif  // _WIN32
	}
	return SClient;
}





bool cSocket::ConnectToLocalhostIPv4(unsigned short a_Port)
{
	sockaddr_in server;
	server.sin_family = AF_INET;
	server.sin_addr.s_addr = INTERNET_ADDRESS_LOCALHOST();
	server.sin_port = htons(a_Port);
	return (connect(m_Socket, (sockaddr *)&server, sizeof(server)) == 0);
}





bool cSocket::ConnectIPv4(const AString & a_HostNameOrAddr, unsigned short a_Port)
{
	// First try IP Address string to hostent conversion, because it's faster
	unsigned long addr = inet_addr(a_HostNameOrAddr.c_str());
	hostent * hp = gethostbyaddr((char*)&addr, sizeof(addr), AF_INET);
	if (hp == NULL)
	{
		// It is not an IP Address string, but rather a regular hostname, resolve:
		hp = gethostbyname(a_HostNameOrAddr.c_str());
		if (hp == NULL)
		{
			LOGWARN("cTCPLink: Could not resolve hostname \"%s\"", a_HostNameOrAddr.c_str());
			CloseSocket();
			return false;
		}
	}

	sockaddr_in server;
	server.sin_addr.s_addr = *((unsigned long*)hp->h_addr);
	server.sin_family = AF_INET;
	server.sin_port = htons( (unsigned short)a_Port );
	return (connect(m_Socket, (sockaddr *)&server, sizeof(server)) == 0);
}





int cSocket::Receive(char* a_Buffer, unsigned int a_Length, unsigned int a_Flags)
{
	return recv(m_Socket, a_Buffer, a_Length, a_Flags);
}





int cSocket::Send(const char * a_Buffer, unsigned int a_Length)
{
	return send(m_Socket, a_Buffer, a_Length, 0);
}





unsigned short cSocket::GetPort(void) const
{
	ASSERT(IsValid());
	
	sockaddr_in Addr;
	socklen_t AddrSize = sizeof(Addr);
	if (getsockname(m_Socket, (sockaddr *)&Addr, &AddrSize) != 0)
	{
		return 0;
	}
	return ntohs(Addr.sin_port);
}