//====== Copyright Valve Corporation, All rights reserved. ====================
//
// Internal implementation details of the steamworks SDK.
//
// You should be able to figure out how to use the SDK by reading
// steam_api_common.h, and should not need to understand anything in here.
// 
//-----------------------------------------------------------------------------

#ifdef STEAM_CALLBACK_BEGIN
#error "This file should only be included from steam_api_common.h"
#endif

#include <string.h>

// Internal functions used by the utility CCallback objects to receive callbacks
S_API void S_CALLTYPE SteamAPI_RegisterCallback( class CCallbackBase *pCallback, int iCallback );
S_API void S_CALLTYPE SteamAPI_UnregisterCallback( class CCallbackBase *pCallback );
// Internal functions used by the utility CCallResult objects to receive async call results
S_API void S_CALLTYPE SteamAPI_RegisterCallResult( class CCallbackBase *pCallback, SteamAPICall_t hAPICall );
S_API void S_CALLTYPE SteamAPI_UnregisterCallResult( class CCallbackBase *pCallback, SteamAPICall_t hAPICall );

S_API HSteamPipe S_CALLTYPE SteamAPI_GetHSteamPipe();
S_API HSteamUser S_CALLTYPE SteamAPI_GetHSteamUser();
S_API HSteamPipe S_CALLTYPE SteamGameServer_GetHSteamPipe();
S_API HSteamUser S_CALLTYPE SteamGameServer_GetHSteamUser();
S_API void *S_CALLTYPE SteamInternal_ContextInit( void *pContextInitData );
S_API void *S_CALLTYPE SteamInternal_CreateInterface( const char *ver );
S_API void *S_CALLTYPE SteamInternal_FindOrCreateUserInterface( HSteamUser hSteamUser, const char *pszVersion );
S_API void *S_CALLTYPE SteamInternal_FindOrCreateGameServerInterface( HSteamUser hSteamUser, const char *pszVersion );

// disable this warning; this pattern need for steam callback registration
#ifdef _MSVC_VER
#pragma warning( push )
#pragma warning( disable: 4355 )	// 'this' : used in base member initializer list
#endif

#define _STEAM_CALLBACK_AUTO_HOOK( thisclass, func, param )
#define _STEAM_CALLBACK_HELPER( _1, _2, SELECTED, ... )		_STEAM_CALLBACK_##SELECTED
#define _STEAM_CALLBACK_SELECT( X, Y )						_STEAM_CALLBACK_HELPER X Y
#define _STEAM_CALLBACK_3( extra_code, thisclass, func, param ) \
	struct CCallbackInternal_ ## func : private CCallbackImpl< sizeof( param ) > { \
		CCallbackInternal_ ## func () { extra_code SteamAPI_RegisterCallback( this, param::k_iCallback ); } \
		CCallbackInternal_ ## func ( const CCallbackInternal_ ## func & ) { extra_code SteamAPI_RegisterCallback( this, param::k_iCallback ); } \
		CCallbackInternal_ ## func & operator=( const CCallbackInternal_ ## func & ) { return *this; } \
		private: virtual void Run( void *pvParam ) { _STEAM_CALLBACK_AUTO_HOOK( thisclass, func, param ) \
			thisclass *pOuter = reinterpret_cast<thisclass*>( reinterpret_cast<char*>(this) - offsetof( thisclass, m_steamcallback_ ## func ) ); \
			pOuter->func( reinterpret_cast<param*>( pvParam ) ); \
		} \
	} m_steamcallback_ ## func ; void func( param *pParam )
#define _STEAM_CALLBACK_4( _, thisclass, func, param, var ) \
	CCallback< thisclass, param > var; void func( param *pParam )
#define _STEAM_CALLBACK_GS( _, thisclass, func, param, var ) \
	CCallback< thisclass, param, true > var; void func( param *pParam )

template< class T, class P >
inline CCallResult<T, P>::CCallResult()
{
	m_hAPICall = k_uAPICallInvalid;
	m_pObj = nullptr;
	m_Func = nullptr;
	m_iCallback = P::k_iCallback;
}

template< class T, class P >
inline void CCallResult<T, P>::Set( SteamAPICall_t hAPICall, T *p, func_t func )
{
	if ( m_hAPICall )
		SteamAPI_UnregisterCallResult( this, m_hAPICall );

	m_hAPICall = hAPICall;
	m_pObj = p;
	m_Func = func;

	if ( hAPICall )
		SteamAPI_RegisterCallResult( this, hAPICall );
}

template< class T, class P >
inline bool CCallResult<T, P>::IsActive() const
{
	return (m_hAPICall != k_uAPICallInvalid);
}

template< class T, class P >
inline void CCallResult<T, P>::Cancel()
{
	if ( m_hAPICall != k_uAPICallInvalid )
	{
		SteamAPI_UnregisterCallResult( this, m_hAPICall );
		m_hAPICall = k_uAPICallInvalid;
	}
}

template< class T, class P >
inline CCallResult<T, P>::~CCallResult()
{
	Cancel();
}

template< class T, class P >
inline void CCallResult<T, P>::Run( void *pvParam )
{
	m_hAPICall = k_uAPICallInvalid; // caller unregisters for us
	(m_pObj->*m_Func)((P *)pvParam, false);
}

template< class T, class P >
inline void CCallResult<T, P>::Run( void *pvParam, bool bIOFailure, SteamAPICall_t hSteamAPICall )
{
	if ( hSteamAPICall == m_hAPICall )
	{
		m_hAPICall = k_uAPICallInvalid; // caller unregisters for us
		(m_pObj->*m_Func)((P *)pvParam, bIOFailure);
	}
}

template< class T, class P, bool bGameserver >
inline CCallback< T, P, bGameserver >::CCallback( T *pObj, func_t func )
	: m_pObj( nullptr ), m_Func( nullptr )
{
	if ( bGameserver )
	{
		this->SetGameserverFlag();
	}
	Register( pObj, func );
}

template< class T, class P, bool bGameserver >
inline void CCallback< T, P, bGameserver >::Register( T *pObj, func_t func )
{
	if ( !pObj || !func )
		return;

	if ( this->m_nCallbackFlags & CCallbackBase::k_ECallbackFlagsRegistered )
		Unregister();

	m_pObj = pObj;
	m_Func = func;
	// SteamAPI_RegisterCallback sets k_ECallbackFlagsRegistered
	SteamAPI_RegisterCallback( this, P::k_iCallback );
}

template< class T, class P, bool bGameserver >
inline void CCallback< T, P, bGameserver >::Unregister()
{
	// SteamAPI_UnregisterCallback removes k_ECallbackFlagsRegistered
	SteamAPI_UnregisterCallback( this );
}

template< class T, class P, bool bGameserver >
inline void CCallback< T, P, bGameserver >::Run( void *pvParam )
{
	(m_pObj->*m_Func)((P *)pvParam);
}

//-----------------------------------------------------------------------------
// Macros to define steam callback structures.  Used internally for debugging
//-----------------------------------------------------------------------------

#ifdef STEAM_CALLBACK_INSPECTION_ENABLED
	#include "../../clientdll/steam_api_callback_inspection.h"
#else
	#define STEAM_CALLBACK_BEGIN( callbackname, callbackid )	struct callbackname { enum { k_iCallback = callbackid };
	#define STEAM_CALLBACK_MEMBER( varidx, vartype, varname )	vartype varname ; 
	#define STEAM_CALLBACK_MEMBER_ARRAY( varidx, vartype, varname, varcount ) vartype varname [ varcount ];
	#define STEAM_CALLBACK_END(nArgs) };
#endif

// Forward declare all of the Steam interfaces.  (Do we really need to do this?)
class ISteamClient;
class ISteamUser;
class ISteamGameServer;
class ISteamFriends;
class ISteamUtils;
class ISteamMatchmaking;
class ISteamContentServer;
class ISteamMatchmakingServers;
class ISteamUserStats;
class ISteamApps;
class ISteamNetworking;
class ISteamRemoteStorage;
class ISteamScreenshots;
class ISteamMusic;
class ISteamMusicRemote;
class ISteamGameServerStats;
class ISteamPS3OverlayRender;
class ISteamHTTP;
class ISteamController;
class ISteamUGC;
class ISteamAppList;
class ISteamHTMLSurface;
class ISteamInventory;
class ISteamVideo;
class ISteamParentalSettings;
class ISteamGameSearch;
class ISteamInput;
class ISteamParties;
class ISteamTV;
class ISteamRemotePlay;

//-----------------------------------------------------------------------------
// Purpose: Base values for callback identifiers, each callback must
//			have a unique ID.
//-----------------------------------------------------------------------------
enum { k_iSteamUserCallbacks = 100 };
enum { k_iSteamGameServerCallbacks = 200 };
enum { k_iSteamFriendsCallbacks = 300 };
enum { k_iSteamBillingCallbacks = 400 };
enum { k_iSteamMatchmakingCallbacks = 500 };
enum { k_iSteamContentServerCallbacks = 600 };
enum { k_iSteamUtilsCallbacks = 700 };
enum { k_iClientFriendsCallbacks = 800 };
enum { k_iClientUserCallbacks = 900 };
enum { k_iSteamAppsCallbacks = 1000 };
enum { k_iSteamUserStatsCallbacks = 1100 };
enum { k_iSteamNetworkingCallbacks = 1200 };
enum { k_iSteamNetworkingSocketsCallbacks = 1220 };
enum { k_iSteamNetworkingMessagesCallbacks = 1250 };
enum { k_iSteamNetworkingUtilsCallbacks = 1280 };
enum { k_iClientRemoteStorageCallbacks = 1300 };
enum { k_iClientDepotBuilderCallbacks = 1400 };
enum { k_iSteamGameServerItemsCallbacks = 1500 };
enum { k_iClientUtilsCallbacks = 1600 };
enum { k_iSteamGameCoordinatorCallbacks = 1700 };
enum { k_iSteamGameServerStatsCallbacks = 1800 };
enum { k_iSteam2AsyncCallbacks = 1900 };
enum { k_iSteamGameStatsCallbacks = 2000 };
enum { k_iClientHTTPCallbacks = 2100 };
enum { k_iClientScreenshotsCallbacks = 2200 };
enum { k_iSteamScreenshotsCallbacks = 2300 };
enum { k_iClientAudioCallbacks = 2400 };
enum { k_iClientUnifiedMessagesCallbacks = 2500 };
enum { k_iSteamStreamLauncherCallbacks = 2600 };
enum { k_iClientControllerCallbacks = 2700 };
enum { k_iSteamControllerCallbacks = 2800 };
enum { k_iClientParentalSettingsCallbacks = 2900 };
enum { k_iClientDeviceAuthCallbacks = 3000 };
enum { k_iClientNetworkDeviceManagerCallbacks = 3100 };
enum { k_iClientMusicCallbacks = 3200 };
enum { k_iClientRemoteClientManagerCallbacks = 3300 };
enum { k_iClientUGCCallbacks = 3400 };
enum { k_iSteamStreamClientCallbacks = 3500 };
enum { k_IClientProductBuilderCallbacks = 3600 };
enum { k_iClientShortcutsCallbacks = 3700 };
enum { k_iClientRemoteControlManagerCallbacks = 3800 };
enum { k_iSteamAppListCallbacks = 3900 };
enum { k_iSteamMusicCallbacks = 4000 };
enum { k_iSteamMusicRemoteCallbacks = 4100 };
enum { k_iClientVRCallbacks = 4200 };
enum { k_iClientGameNotificationCallbacks = 4300 }; 
enum { k_iSteamGameNotificationCallbacks = 4400 }; 
enum { k_iSteamHTMLSurfaceCallbacks = 4500 };
enum { k_iClientVideoCallbacks = 4600 };
enum { k_iClientInventoryCallbacks = 4700 };
enum { k_iClientBluetoothManagerCallbacks = 4800 };
enum { k_iClientSharedConnectionCallbacks = 4900 };
enum { k_ISteamParentalSettingsCallbacks = 5000 };
enum { k_iClientShaderCallbacks = 5100 };
enum { k_iSteamGameSearchCallbacks = 5200 };
enum { k_iSteamPartiesCallbacks = 5300 };
enum { k_iClientPartiesCallbacks = 5400 };
enum { k_iSteamSTARCallbacks = 5500 };
enum { k_iClientSTARCallbacks = 5600 };
enum { k_iSteamRemotePlayCallbacks = 5700 };

// Macro used to define a type-safe accessor that will always return the version
// of the interface of the *header file* you are compiling with!  We also bounce
// through a safety function that checks for interfaces being created or destroyed.
#ifndef STEAM_API_EXPORTS
	// SteamInternal_ContextInit takes a base pointer for the equivalent of
	// struct { void (*pFn)(void* pCtx); uintp counter; CSteamAPIContext ctx; }
	// Do not change layout of 2 + sizeof... or add non-pointer aligned data!
	// NOTE: declaring "static CSteamAPIConext" creates a large function
	// which queries the initialization status of the object. We know that
	// it is pointer-aligned and fully memset with zeros, so just alias a
	// static buffer of the appropriate size and call it a CSteamAPIContext.
	#define STEAM_DEFINE_INTERFACE_ACCESSOR( type, name, expr ) \
		inline void S_CALLTYPE SteamInternal_Init_ ## name( type *p ) { *p = (type)( expr ); } \
		inline type name() { \
			static void* s_CallbackCounterAndContext[ 3 ] = { (void*)&SteamInternal_Init_ ## name, 0, 0 }; \
			return *(type*)SteamInternal_ContextInit( s_CallbackCounterAndContext ); \
		}

#else
	// Stub when we're compiling steam_api.dll itself.  These are inline
	// functions defined when the header is included.  not functions exported
	// by the lib!
	#define STEAM_DEFINE_INTERFACE_ACCESSOR( type, name, expr )
#endif

#define STEAM_DEFINE_USER_INTERFACE_ACCESSOR( type, name, version ) \
	STEAM_DEFINE_INTERFACE_ACCESSOR( type, name, SteamInternal_FindOrCreateUserInterface( SteamAPI_GetHSteamUser(), version ) )
#define STEAM_DEFINE_GAMESERVER_INTERFACE_ACCESSOR( type, name, version ) \
	STEAM_DEFINE_INTERFACE_ACCESSOR( type, name, SteamInternal_FindOrCreateGameServerInterface( SteamGameServer_GetHSteamUser(), version ) )

#ifdef _MSVC_VER
#pragma warning( pop )
#endif

// CSteamAPIContext encapsulates the Steamworks API global accessors into
// a single object.
//
// DEPRECATED: Used the global interface accessors instead!
//
// This will be removed in a future iteration of the SDK
class CSteamAPIContext
{
public:
	CSteamAPIContext() { Clear(); }
	inline void Clear() { memset( this, 0, sizeof(*this) ); }
	inline bool Init(); // NOTE: This is defined in steam_api.h, to avoid this file having to include everything
	ISteamClient*		SteamClient() const					{ return m_pSteamClient; }
	ISteamUser*			SteamUser() const					{ return m_pSteamUser; }
	ISteamFriends*		SteamFriends() const				{ return m_pSteamFriends; }
	ISteamUtils*		SteamUtils() const					{ return m_pSteamUtils; }
	ISteamMatchmaking*	SteamMatchmaking() const			{ return m_pSteamMatchmaking; }
	ISteamGameSearch*	SteamGameSearch() const				{ return m_pSteamGameSearch; }
	ISteamUserStats*	SteamUserStats() const				{ return m_pSteamUserStats; }
	ISteamApps*			SteamApps() const					{ return m_pSteamApps; }
	ISteamMatchmakingServers* SteamMatchmakingServers() const { return m_pSteamMatchmakingServers; }
	ISteamNetworking*	SteamNetworking() const				{ return m_pSteamNetworking; }
	ISteamRemoteStorage* SteamRemoteStorage() const			{ return m_pSteamRemoteStorage; }
	ISteamScreenshots*	SteamScreenshots() const			{ return m_pSteamScreenshots; }
	ISteamHTTP*			SteamHTTP() const					{ return m_pSteamHTTP; }
	ISteamController*	SteamController() const				{ return m_pController; }
	ISteamUGC*			SteamUGC() const					{ return m_pSteamUGC; }
	ISteamAppList*		SteamAppList() const				{ return m_pSteamAppList; }
	ISteamMusic*		SteamMusic() const					{ return m_pSteamMusic; }
	ISteamMusicRemote*	SteamMusicRemote() const			{ return m_pSteamMusicRemote; }
	ISteamHTMLSurface*	SteamHTMLSurface() const			{ return m_pSteamHTMLSurface; }
	ISteamInventory*	SteamInventory() const				{ return m_pSteamInventory; }
	ISteamVideo*		SteamVideo() const					{ return m_pSteamVideo; }
	ISteamTV*			SteamTV() const						{ return m_pSteamTV; }
	ISteamParentalSettings* SteamParentalSettings() const	{ return m_pSteamParentalSettings; }
	ISteamInput*		SteamInput() const					{ return m_pSteamInput; }
private:
	ISteamClient		*m_pSteamClient;
	ISteamUser			*m_pSteamUser;
	ISteamFriends		*m_pSteamFriends;
	ISteamUtils			*m_pSteamUtils;
	ISteamMatchmaking	*m_pSteamMatchmaking;
	ISteamGameSearch	*m_pSteamGameSearch;
	ISteamUserStats		*m_pSteamUserStats;
	ISteamApps			*m_pSteamApps;
	ISteamMatchmakingServers *m_pSteamMatchmakingServers;
	ISteamNetworking	*m_pSteamNetworking;
	ISteamRemoteStorage *m_pSteamRemoteStorage;
	ISteamScreenshots	*m_pSteamScreenshots;
	ISteamHTTP			*m_pSteamHTTP;
	ISteamController	*m_pController;
	ISteamUGC			*m_pSteamUGC;
	ISteamAppList		*m_pSteamAppList;
	ISteamMusic			*m_pSteamMusic;
	ISteamMusicRemote	*m_pSteamMusicRemote;
	ISteamHTMLSurface	*m_pSteamHTMLSurface;
	ISteamInventory		*m_pSteamInventory;
	ISteamVideo			*m_pSteamVideo;
	ISteamTV			*m_pSteamTV;
	ISteamParentalSettings *m_pSteamParentalSettings;
	ISteamInput			*m_pSteamInput;
};

class CSteamGameServerAPIContext
{
public:
	CSteamGameServerAPIContext() { Clear(); }
	inline void Clear() { memset( this, 0, sizeof(*this) ); }
	inline bool Init(); // NOTE: This is defined in steam_gameserver.h, to avoid this file having to include everything

	ISteamClient *SteamClient() const					{ return m_pSteamClient; }
	ISteamGameServer *SteamGameServer() const			{ return m_pSteamGameServer; }
	ISteamUtils *SteamGameServerUtils() const			{ return m_pSteamGameServerUtils; }
	ISteamNetworking *SteamGameServerNetworking() const	{ return m_pSteamGameServerNetworking; }
	ISteamGameServerStats *SteamGameServerStats() const	{ return m_pSteamGameServerStats; }
	ISteamHTTP *SteamHTTP() const						{ return m_pSteamHTTP; }
	ISteamInventory *SteamInventory() const				{ return m_pSteamInventory; }
	ISteamUGC *SteamUGC() const							{ return m_pSteamUGC; }
	ISteamApps *SteamApps() const						{ return m_pSteamApps; }

private:
	ISteamClient				*m_pSteamClient;
	ISteamGameServer			*m_pSteamGameServer;
	ISteamUtils					*m_pSteamGameServerUtils;
	ISteamNetworking			*m_pSteamGameServerNetworking;
	ISteamGameServerStats		*m_pSteamGameServerStats;
	ISteamHTTP					*m_pSteamHTTP;
	ISteamInventory				*m_pSteamInventory;
	ISteamUGC					*m_pSteamUGC;
	ISteamApps					*m_pSteamApps;
};