/// \file
/// \brief \b [Internal] Encapsulates Berkely sockets
///
/// This file is part of RakNet Copyright 2003 Kevin Jenkins.
///
/// Usage of RakNet is subject to the appropriate license agreement.
/// Creative Commons Licensees are subject to the
/// license found at
/// http://creativecommons.org/licenses/by-nc/2.5/
/// Single application licensees are subject to the license found at
/// http://www.rakkarsoft.com/SingleApplicationLicense.html
/// Custom license users are subject to the terms therein.
/// GPL license users are subject to the GNU General Public
/// License as published by the Free
/// Software Foundation; either version 2 of the License, or (at your
/// option) any later version.


#ifndef __SOCKET_LAYER_H
#define __SOCKET_LAYER_H

#ifdef _COMPATIBILITY_1
#include "Compatibility1Includes.h"
#elif defined(_WIN32)
// IP_DONTFRAGMENT is different between winsock 1 and winsock 2.  Therefore, Winsock2.h must be linked againt Ws2_32.lib
// winsock.h must be linked against WSock32.lib.  If these two are mixed up the flag won't work correctly
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h> 
/// Unix/Linux uses ints for sockets
typedef int SOCKET;
#define INVALID_SOCKET -1 
#define SOCKET_ERROR -1
#endif
#include "ClientContextStruct.h"

class RakPeer;

// A platform independent implementation of Berkeley sockets, with settings used by RakNet
class SocketLayer
{

public:
	
	/// Default Constructor
	SocketLayer();
	
	/// Destructor	
	~SocketLayer();
	
	// Get the singleton instance of the Socket Layer.
	/// \return unique instance 
	static inline SocketLayer* Instance()
	{
		return & I;
	}
	
	// Connect a socket to a remote host.
	/// \param[in] writeSocket The local socket.
	/// \param[in] binaryAddress The address of the remote host.
	/// \param[in] port the remote port.
	/// \return A new socket used for communication.
	SOCKET Connect( SOCKET writeSocket, unsigned int binaryAddress, unsigned short port );
	
	// Creates a bound socket to listen for incoming connections on the specified port
	/// \param[in] port the port number 
	/// \param[in] blockingSocket 
	/// \return A new socket used for accepting clients 
	SOCKET CreateBoundSocket( unsigned short port, bool blockingSocket, const char *forceHostAddress );

	#if !defined(_COMPATIBILITY_1)
	const char* DomainNameToIP( const char *domainName );
	#endif
	
	#ifdef __USE_IO_COMPLETION_PORTS
	void AssociateSocketWithCompletionPort( SOCKET socket, ClientContextStruct* completionKey );
	#endif
	
	/// Start an asynchronous read using the specified socket.  The callback will use the specified PlayerID (associated with this socket) and call either the client or the server callback (one or
	/// the other should be 0)
	/// \note Was used for depreciated IO completion ports.	
	bool AssociateSocketWithCompletionPortAndRead( SOCKET readSocket, unsigned int binaryAddress, unsigned short port, RakPeer* rakPeer );
	
	/// Write \a data of length \a length to \a writeSocket
	/// \param[in] writeSocket The socket to write to
	/// \param[in] data The data to write
	/// \param[in] length The length of \a data	
	void Write( const SOCKET writeSocket, const char* data, const int length );
	
	/// Read data from a socket 
	/// \param[in] s the socket 
	/// \param[in] rakPeer The instance of rakPeer containing the recvFrom C callback
	/// \param[in] errorCode An error code if an error occured .
	/// \return Returns true if you successfully read data, false on error.
	int RecvFrom( const SOCKET s, RakPeer *rakPeer, int *errorCode );
	
#if !defined(_COMPATIBILITY_1)
	/// Retrieve all local IP address in a string format.
	/// \param[in] ipList An array of ip address in dotted notation.
	void GetMyIP( char ipList[ 10 ][ 16 ] );
#endif
	
	/// Call sendto (UDP obviously)
	/// \param[in] s the socket
	/// \param[in] data The byte buffer to send 
	/// \param[in] length The length of the \a data in bytes
	/// \param[in] ip The address of the remote host in dotted notation.
	/// \param[in] port The port number to send to.
	/// \return 0 on success, nonzero on failure.
	int SendTo( SOCKET s, const char *data, int length, char ip[ 16 ], unsigned short port );
	
	/// Call sendto (UDP obviously)
	/// \param[in] s the socket
	/// \param[in] data The byte buffer to send 
	/// \param[in] length The length of the \a data in bytes
	/// \param[in] binaryAddress The address of the remote host in binary format.
	/// \param[in] port The port number to send to.
	/// \return 0 on success, nonzero on failure.
	int SendTo( SOCKET s, const char *data, int length, unsigned int binaryAddress, unsigned short port );
		
	/// Returns the local port, useful when passing 0 as the startup port.
	/// \param[in] s The socket whose port we are referring to
	/// \return The local port
	unsigned short GetLocalPort ( SOCKET s );
private:
	
	static bool socketLayerStarted;
#ifdef _WIN32
	static WSADATA winsockInfo;
#endif
	static SocketLayer I;
};

#endif