/**

  * 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_