/**

 * vim: set ts=4 :

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

 * SourceMod

 * Copyright (C) 2004-2008 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_CONVARMANAGER_H_

#define _INCLUDE_SOURCEMOD_CONVARMANAGER_H_

#include "sm_globals.h"

#include "sourcemm_api.h"

#include <sh_list.h>

#include <IPluginSys.h>

#include <IForwardSys.h>

#include <IHandleSys.h>

#include <IRootConsoleMenu.h>

#include <compat_wrappers.h>

#include "concmd_cleaner.h"

#if SOURCE_ENGINE == SE_DARKMESSIAH

class EQueryCvarValueStatus;

typedef int QueryCvarCookie_t;

#endif

using namespace SourceHook;

class IConVarChangeListener

{

public:

	virtual void OnConVarChanged(ConVar *pConVar, const char *oldValue, float flOldValue) =0;

};

/**

 * Holds SourceMod-specific information about a convar

 */

struct ConVarInfo

{

	Handle_t handle;					/**< Handle to self */

	bool sourceMod;						/**< Determines whether or not convar was created by a SourceMod plugin */

	IChangeableForward *pChangeForward;	/**< Forward associated with convar */

	ConVar *pVar;						/**< The actual convar */

	List<IConVarChangeListener *> changeListeners;

};

/**

 * Holds information about a client convar query

 */

struct ConVarQuery

{

	QueryCvarCookie_t cookie;			/**< Cookie that identifies query */

	IPluginFunction *pCallback;			/**< Function that will be called when query is finished */

	cell_t value;						/**< Optional value passed to query function */

};

class ConVarManager :

	public SMGlobalClass,

	public IHandleTypeDispatch,

	public IPluginsListener,

	public IRootConsoleCommand,

	public IConCommandTracker

{

public:

	ConVarManager();

	~ConVarManager();

public: // SMGlobalClass

	void OnSourceModStartup(bool late);

	void OnSourceModAllInitialized();

	void OnSourceModShutdown();

	void OnSourceModVSPReceived();

public: // IHandleTypeDispatch

	void OnHandleDestroy(HandleType_t type, void *object);

	bool GetHandleApproxSize(HandleType_t type, void *object, unsigned int *pSize);

public: // IPluginsListener

	void OnPluginUnloaded(IPlugin *plugin);

public: //IRootConsoleCommand

	void OnRootConsoleCommand(const char *cmdname, const CCommand &command);

public: //IConCommandTracker

	void OnUnlinkConCommandBase(ConCommandBase *pBase, const char *name, bool is_read_safe);

public:

	/**

	 * Create a convar and return a handle to it.

	 */

	Handle_t CreateConVar(IPluginContext *pContext, const char *name, const char *defaultVal,

	                      const char *description, int flags, bool hasMin, float min, bool hasMax, float max);

	/**

	 * Searches for a convar and returns a handle to it

	 */

	Handle_t FindConVar(const char* name);

	/**

	 * Add a function to call when the specified convar changes.

	 */

	void HookConVarChange(ConVar *pConVar, IPluginFunction *pFunction);

	/**

	 * Remove a function from the forward that will be called when the specified convar changes.

	 */

	void UnhookConVarChange(ConVar *pConVar, IPluginFunction *pFunction);

	void AddConVarChangeListener(const char *name, IConVarChangeListener *pListener);

	void RemoveConVarChangeListener(const char *name, IConVarChangeListener *pListener);

	/**

	 * Starts a query to find the value of a client convar.

	 */

	QueryCvarCookie_t QueryClientConVar(edict_t *pPlayer, const char *name, IPluginFunction *pCallback,

	                                    Handle_t hndl);

	bool IsQueryingSupported();

	HandleError ReadConVarHandle(Handle_t hndl, ConVar **pVar);

private:

	/**

	 * Adds a convar to a plugin's list.

	 */

	static void AddConVarToPluginList(IPluginContext *pContext, const ConVar *pConVar);

	/**

	 * Static callback that Valve's ConVar object executes when the convar's value changes.

	 */

#if SOURCE_ENGINE >= SE_ORANGEBOX

	static void OnConVarChanged(ConVar *pConVar, const char *oldValue, float flOldValue);

#else

	static void OnConVarChanged(ConVar *pConVar, const char *oldValue);

#endif

	/**

	 * Callback for when StartQueryCvarValue() has finished.

	 */

#if SOURCE_ENGINE != SE_DARKMESSIAH

	void OnQueryCvarValueFinished(QueryCvarCookie_t cookie, edict_t *pPlayer, EQueryCvarValueStatus result,

	                              const char *cvarName, const char *cvarValue);

#endif

private:

	HandleType_t m_ConVarType;

	List<ConVarInfo *> m_ConVars;

	List<ConVarQuery> m_ConVarQueries;

	bool m_bIsDLLQueryHooked;

	bool m_bIsVSPQueryHooked;

};

extern ConVarManager g_ConVarManager;

#endif // _INCLUDE_SOURCEMOD_CONVARMANAGER_H_