/**
 * vim: set ts=4 :
 * ================================================================
 * SourceMod
 * Copyright (C) 2004-2007 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_trie.h"
#include <sh_list.h>
#include <sh_stack.h>
#include <IHandleSys.h>
#include <IForwardSys.h>
#include <IPluginSys.h>

using namespace SourceHook;

struct EventInfo
{
	IGameEvent *pEvent;
	IdentityToken_t *pOwner;
};

struct EventHook
{
	EventHook()
	{
		pPreHook = NULL;
		pPostHook = NULL;
		postCopy = false;
		pEventCopy = NULL;
		refCount = 0;
	}
	IChangeableForward *pPreHook;
	IChangeableForward *pPostHook;
	bool postCopy;
	IGameEvent *pEventCopy;
	unsigned int refCount;
};

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);
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;
	Trie *m_EventHooks;
	CStack<EventInfo *> m_FreeEvents;
	CStack<const char *> m_EventNames;
};

extern EventManager g_EventManager;

#endif // _INCLUDE_SOURCEMOD_EVENTMANAGER_H_