/**
 * 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_CONVARMANAGER_H_
#define _INCLUDE_SOURCEMOD_CONVARMANAGER_H_

#include "sm_globals.h"
#include "sourcemm_api.h"
#include "sm_trie.h"
#include <sh_list.h>
#include <IPluginSys.h>
#include <IForwardSys.h>
#include <IHandleSys.h>
#include <IRootConsoleMenu.h>

using namespace SourceHook;

/**
 * Holds SourceMod-specific information about a convar
 */
struct ConVarInfo
{
	Handle_t handle;					/**< Handle to convar */
	bool sourceMod;						/**< Determines whether or not convar was created by a SourceMod plugin */
	IChangeableForward *pChangeForward;	/**< Forward associated with convar */
	FnChangeCallback origCallback;		/**< The original callback function */
#if PLAPI_VERSION < 12
	const char *name;					/**< Name of convar */
#endif
};

/**
 * 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:
	ConVarManager();
	~ConVarManager();
public: // SMGlobalClass
	void OnSourceModAllInitialized();
	void OnSourceModShutdown();
	void OnSourceModVSPReceived(IServerPluginCallbacks *iface);
public: // IHandleTypeDispatch
	void OnHandleDestroy(HandleType_t type, void *object);
public: // IPluginsListener
	void OnPluginUnloaded(IPlugin *plugin);
public: //IRootConsoleCommand
	void OnRootConsoleCommand(const char *command, unsigned int argcount);
public:
	/**
	 * Get the 'ConVar' handle type ID.
	 */
	inline HandleType_t GetHandleType()
	{
		return m_ConVarType;
	}

	/**
	 * Get the convar lookup trie.
	 */
	inline Trie *GetConVarCache()
	{
		return m_ConVarCache;
	}
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);

	/**
	 * 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);

#if PLAPI_VERSION >= 12
	/**
	 * Called when Metamod:Source is about to remove convar
	 */
	void OnUnlinkConCommandBase(PluginId id, ConCommandBase *pCommand);
#else
	/**
	 * Called when Metamod:Source has unloaded a plugin
	 */
	void OnMetamodPluginUnloaded(PluginId id);
#endif
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.
	 */
	static void OnConVarChanged(ConVar *pConVar, const char *oldValue);

	/**
	 * Callback for when StartQueryCvarValue() has finished.
	 */
	void OnQueryCvarValueFinished(QueryCvarCookie_t cookie, edict_t *pPlayer, EQueryCvarValueStatus result,
	                              const char *cvarName, const char *cvarValue);
private:
	HandleType_t m_ConVarType;
	List<ConVarInfo *> m_ConVars;
	List<ConVarQuery> m_ConVarQueries;
	Trie *m_ConVarCache;
	IServerPluginCallbacks *m_VSPIface;
	bool m_CanQueryConVars;
#if PLAPI_VERSION < 12
	bool m_IgnoreHandle;
#endif
};

extern ConVarManager g_ConVarManager;

#endif // _INCLUDE_SOURCEMOD_CONVARMANAGER_H_