/**

 * vim: set ts=4 :

 * =============================================================================

 * SourceMod

 * Copyright (C) 2004-2010 AlliedModders LLC.  All rights reserved.

 * =============================================================================

 *

 * This program is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License, version 3.0, as published by the

 * Free Software Foundation.

 * 

 * This program 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/>.

 *

 * As a special exception, AlliedModders LLC gives you permission to link the

 * code of this program (as well as its derivative works) to "Half-Life 2," the

 * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software

 * by the Valve Corporation.  You must obey the GNU General Public License in

 * all respects for all other code used.  Additionally, AlliedModders LLC grants

 * this exception to all derivative works.  AlliedModders LLC defines further

 * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),

 * or <http://www.sourcemod.net/license.php>.

 *

 * Version: $Id$

 */

#ifndef _INCLUDE_SOURCEMOD_CUSERMESSAGES_H_

#define _INCLUDE_SOURCEMOD_CUSERMESSAGES_H_

#include "ShareSys.h"

#include <IUserMessages.h>

#include "sourcemm_api.h"

#include "sm_trie.h"

#include "sm_stringutil.h"

#include "CellRecipientFilter.h"

using namespace SourceHook;

using namespace SourceMod;

#if SOURCE_ENGINE == SE_CSGO

#define USE_PROTOBUF_USERMESSAGES

#endif

#ifdef USE_PROTOBUF_USERMESSAGES

#include <google/protobuf/message.h>

#include <google/protobuf/descriptor.h>

#include <netmessages.pb.h>

using namespace google;

#else

#include <bitbuf.h>

#endif

#define INVALID_MESSAGE_ID -1

struct ListenerInfo

{

#ifdef USE_PROTOBUF_USERMESSAGES

	IProtobufUserMessageListener *Callback;

#else

	IBitBufUserMessageListener *Callback;

#endif

	bool IsHooked;

	bool KillMe;

	bool IsNew;

};

typedef List<ListenerInfo *> MsgList;

typedef List<ListenerInfo *>::iterator MsgIter;

class UserMessages : 

	public IUserMessages,

	public SMGlobalClass

{

public:

	UserMessages();

	~UserMessages();

public: //SMGlobalClass

	void OnSourceModStartup(bool late);

	void OnSourceModAllInitialized();

	void OnSourceModAllShutdown();

public: //IUserMessages

	int GetMessageIndex(const char *msg);

	bool GetMessageName(int msgid, char *buffer, size_t maxlength) const;

	bool HookUserMessage(int msg_id, IUserMessageListener *pListener, bool intercept=false);

	bool UnhookUserMessage(int msg_id, IUserMessageListener *pListener, bool intercept=false);

	bf_write *StartBitBufMessage(int msg_id, const cell_t players[], unsigned int playersNum, int flags);

	google::protobuf::Message *StartProtobufMessage(int msg_id, const cell_t players[], unsigned int playersNum, int flags);

	bool EndMessage();

	bool HookUserMessage2(int msg_id,

		IUserMessageListener *pListener,

		bool intercept=false);

	bool UnhookUserMessage2(int msg_id,

		IUserMessageListener *pListener,

		bool intercept=false);

	UserMessageType GetUserMessageType() const;

public:

#if SOURCE_ENGINE == SE_CSGO

	void OnSendUserMessage_Pre(IRecipientFilter &filter, int msg_type, const protobuf::Message &msg);

	void OnSendUserMessage_Post(IRecipientFilter &filter, int msg_type, const protobuf::Message &msg);

#endif

#if SOURCE_ENGINE == SE_CSGO

	protobuf::Message *OnStartMessage_Pre(IRecipientFilter *filter, int msg_type, const char *msg_name);

	protobuf::Message *OnStartMessage_Post(IRecipientFilter *filter, int msg_type, const char *msg_name);

#elif SOURCE_ENGINE >= SE_LEFT4DEAD

	bf_write *OnStartMessage_Pre(IRecipientFilter *filter, int msg_type, const char *msg_name);

	bf_write *OnStartMessage_Post(IRecipientFilter *filter, int msg_type, const char *msg_name);

#else

	bf_write *OnStartMessage_Pre(IRecipientFilter *filter, int msg_type);

	bf_write *OnStartMessage_Post(IRecipientFilter *filter, int msg_type);

#endif

	void OnMessageEnd_Pre();

	void OnMessageEnd_Post();

private:

#ifdef USE_PROTOBUF_USERMESSAGES

	bool InternalHook(int msg_id, IProtobufUserMessageListener *pListener, bool intercept, bool isNew);

	bool InternalUnhook(int msg_id, IProtobufUserMessageListener *pListener, bool intercept, bool isNew);

#else

	bool InternalHook(int msg_id, IBitBufUserMessageListener *pListener, bool intercept, bool isNew);

	bool InternalUnhook(int msg_id, IBitBufUserMessageListener *pListener, bool intercept, bool isNew);

#endif

	void _DecRefCounter();

private:

	List<ListenerInfo *> m_msgHooks[255];

	List<ListenerInfo *> m_msgIntercepts[255];

	CStack<ListenerInfo *> m_FreeListeners;

	unsigned char m_pBase[2500];

	IRecipientFilter *m_CurRecFilter;

#ifndef USE_PROTOBUF_USERMESSAGES

	bf_write m_InterceptBuffer;

	bf_write *m_OrigBuffer;

	bf_read m_ReadBuffer;

#else

	// The engine used to provide this. Now we track it.

	protobuf::Message *m_OrigBuffer;

	protobuf::Message *m_FakeEngineBuffer;

	META_RES m_FakeMetaRes;

	protobuf::Message *m_InterceptBuffer;

#endif

	size_t m_HookCount;

	bool m_InHook;

	bool m_BlockEndPost;

#ifndef USE_PROTOBUF_USERMESSAGES

	bool m_FallbackSearch;

	Trie *m_Names;

#endif

	CellRecipientFilter m_CellRecFilter;

	bool m_InExec;

	int m_CurFlags;

	int m_CurId;

};

extern UserMessages g_UserMsgs;

#endif //_INCLUDE_SOURCEMOD_CUSERMESSAGES_H_