/**

 * vim: set ts=4 sw=4 tw=99 noet :

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

 * 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_EVENTMANAGER_H_

#define _INCLUDE_SOURCEMOD_EVENTMANAGER_H_

#include "sm_globals.h"

#include "sourcemm_api.h"

#include <sm_namehashset.h>

#include <sh_list.h>

#include <sh_stack.h>

#include <IHandleSys.h>

#include <IForwardSys.h>

#include <IPluginSys.h>

using namespace SourceHook;

struct EventInfo

{

	EventInfo()

	{

	}

	EventInfo(IGameEvent *ev, IdentityToken_t *owner) : pEvent(ev), pOwner(owner)

	{

	}

	IGameEvent *pEvent;

	IdentityToken_t *pOwner;

	bool bDontBroadcast;

};

struct EventHook

{

	EventHook()

	{

		pPreHook = NULL;

		pPostHook = NULL;

		postCopy = false;

		refCount = 0;

	}

	IChangeableForward *pPreHook;

	IChangeableForward *pPostHook;

	bool postCopy;

	unsigned int refCount;

	char *name;

	static inline bool matches(const char *name, const EventHook *hook)

	{

		return strcmp(name, hook->name) == 0;

	}

};

enum EventHookMode

{

	EventHookMode_Pre,

	EventHookMode_Post,

	EventHookMode_PostNoCopy

};

enum EventHookError

{

	EventHookErr_Okay = 0,			/**< No error */

	EventHookErr_InvalidEvent,		/**< Specified event does not exist */

	EventHookErr_NotActive,			/**< Specified event has no active hook */

	EventHookErr_InvalidCallback,	/**< Specified event does not fire specified callback */ 

};

class EventManager :

	public SMGlobalClass,

	public IHandleTypeDispatch,

	public IPluginsListener,

	public IGameEventListener2

{

public:

	EventManager();

	~EventManager();

public: // SMGlobalClass

	void OnSourceModAllInitialized();

	void OnSourceModShutdown();

public: // IHandleTypeDispatch

	void OnHandleDestroy(HandleType_t type, void *object);

public: // IPluginsListener

	void OnPluginUnloaded(IPlugin *plugin);

public: // IGameEventListener2

	void FireGameEvent(IGameEvent *pEvent);

#if SOURCE_ENGINE >= SE_LEFT4DEAD

	int GetEventDebugID();

#endif

public:

	/**

	 * Get the 'GameEvent' handle type ID.

	 */

	inline HandleType_t GetHandleType()

	{

		return m_EventType;

	}

public:

	EventHookError HookEvent(const char *name, IPluginFunction *pFunction, EventHookMode mode=EventHookMode_Post);

	EventHookError UnhookEvent(const char *name, IPluginFunction *pFunction, EventHookMode mode=EventHookMode_Post);

	EventInfo *CreateEvent(IPluginContext *pContext, const char *name, bool force=false);

	void FireEvent(EventInfo *pInfo, bool bDontBroadcast=false);

	void CancelCreatedEvent(EventInfo *pInfo);

private: // IGameEventManager2 hooks

	bool OnFireEvent(IGameEvent *pEvent, bool bDontBroadcast);

	bool OnFireEvent_Post(IGameEvent *pEvent, bool bDontBroadcast);

private:

	HandleType_t m_EventType;

	NameHashSet<EventHook *> m_EventHooks;

	CStack<EventInfo *> m_FreeEvents;

	CStack<EventHook *> m_EventStack;

	CStack<IGameEvent *> m_EventCopies;

};

extern EventManager g_EventManager;

#endif // _INCLUDE_SOURCEMOD_EVENTMANAGER_H_