/**

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

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

  * SourceMod

  * Copyright (C) 2004-2009 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>.

  */

 #include "ConVarManager.h"

 #include "HalfLife2.h"

 #include "PluginSys.h"

 #include "ForwardSys.h"

 #include "HandleSys.h"

 #include "sm_srvcmds.h"

 #include "sm_stringutil.h"

 #include <sh_vector.h>

 #include <sm_trie_tpl.h>

 ConVarManager g_ConVarManager;

 #if SOURCE_ENGINE <= SE_DARKMESSIAH

 #define CallGlobalChangeCallbacks	CallGlobalChangeCallback

 #endif

 #if SOURCE_ENGINE >= SE_ORANGEBOX

 SH_DECL_HOOK3_void(ICvar, CallGlobalChangeCallbacks, SH_NOATTRIB, false, ConVar *, const char *, float);

 #else

 SH_DECL_HOOK2_void(ICvar, CallGlobalChangeCallbacks, SH_NOATTRIB, false, ConVar *, const char *);

 #endif

 #if SOURCE_ENGINE != SE_DARKMESSIAH

 SH_DECL_HOOK5_void(IServerGameDLL, OnQueryCvarValueFinished, SH_NOATTRIB, 0, QueryCvarCookie_t, edict_t *, EQueryCvarValueStatus, const char *, const char *);

 SH_DECL_HOOK5_void(IServerPluginCallbacks, OnQueryCvarValueFinished, SH_NOATTRIB, 0, QueryCvarCookie_t, edict_t *, EQueryCvarValueStatus, const char *, const char *);

 #endif

 const ParamType CONVARCHANGE_PARAMS[] = {Param_Cell, Param_String, Param_String};

 typedef List<const ConVar *> ConVarList;

 KTrie<ConVarInfo *> convar_cache;

 ConVarManager::ConVarManager() : m_ConVarType(0), m_bIsDLLQueryHooked(false), m_bIsVSPQueryHooked(false)

 {

 }

 ConVarManager::~ConVarManager()

 {

 }

 void ConVarManager::OnSourceModStartup(bool late)

 {

 	HandleAccess sec;

 	/* Set up access rights for the 'ConVar' handle type */

 	sec.access[HandleAccess_Read] = 0;

 	sec.access[HandleAccess_Delete] = HANDLE_RESTRICT_IDENTITY | HANDLE_RESTRICT_OWNER;

 	sec.access[HandleAccess_Clone] = HANDLE_RESTRICT_IDENTITY | HANDLE_RESTRICT_OWNER;

 	/* Create the 'ConVar' handle type */

 	m_ConVarType = g_HandleSys.CreateType("ConVar", this, 0, NULL, &sec, g_pCoreIdent, NULL);

 }

 void ConVarManager::OnSourceModAllInitialized()

 {

 	/**

 	 * Episode 2 has this function by default, but the older versions do not.

 	 */

 #if SOURCE_ENGINE == SE_EPISODEONE

 	if (g_SMAPI->GetGameDLLVersion() >= 6)

 	{

 		SH_ADD_HOOK_MEMFUNC(IServerGameDLL, OnQueryCvarValueFinished, gamedll, this, &ConVarManager::OnQueryCvarValueFinished, false);

 		m_bIsDLLQueryHooked = true;

 	}

 #endif

 	SH_ADD_HOOK_STATICFUNC(ICvar, CallGlobalChangeCallbacks, icvar, OnConVarChanged, false);

 	g_PluginSys.AddPluginsListener(this);

 	/* Add the 'convars' option to the 'sm' console command */

 	g_RootMenu.AddRootConsoleCommand("cvars", "View convars created by a plugin", this);

 }

 void ConVarManager::OnSourceModShutdown()

 {

 	List<ConVarInfo *>::iterator iter = m_ConVars.begin();

 	HandleSecurity sec(NULL, g_pCoreIdent);

 	/* Iterate list of ConVarInfo structures, remove every one of them */

 	while (iter != m_ConVars.end())

 	{

 		ConVarInfo *pInfo = (*iter);

 		iter = m_ConVars.erase(iter);

 		g_HandleSys.FreeHandle(pInfo->handle, &sec);

 		if (pInfo->pChangeForward != NULL)

 		{

 			g_Forwards.ReleaseForward(pInfo->pChangeForward);

 		}

 		if (pInfo->sourceMod)

 		{

 			/* If we created it, we won't be tracking it, therefore it is 

 			 * safe to remove everything in one go.

 			 */

 			META_UNREGCVAR(pInfo->pVar);

 			delete [] pInfo->pVar->GetName();

 			delete [] pInfo->pVar->GetHelpText();

 			delete [] pInfo->pVar->GetDefault();

 			delete pInfo->pVar;

 		}

 		else

 		{

 			/* If we didn't create it, we might be tracking it.  Also, 

 			 * it could be unreadable.

 			 */

 			UntrackConCommandBase(pInfo->pVar, this);

 		}

 		/* It's not safe to read the name here, so we simply delete the 

 		 * the info struct and clear the lookup cache at the end.

 		 */

 		delete pInfo;

 	}

 	convar_cache.clear();

 #if SOURCE_ENGINE != SE_DARKMESSIAH

 	/* Unhook things */

 	if (m_bIsDLLQueryHooked)

 	{

 		SH_REMOVE_HOOK_MEMFUNC(IServerGameDLL, OnQueryCvarValueFinished, gamedll, this, &ConVarManager::OnQueryCvarValueFinished, false);

 		m_bIsDLLQueryHooked = false;

 	}

 	else if (m_bIsVSPQueryHooked)

 	{

 		SH_REMOVE_HOOK_MEMFUNC(IServerPluginCallbacks, OnQueryCvarValueFinished, vsp_interface, this, &ConVarManager::OnQueryCvarValueFinished, false);

 		m_bIsVSPQueryHooked = false;

 	}

 #endif

 	SH_REMOVE_HOOK_STATICFUNC(ICvar, CallGlobalChangeCallbacks, icvar, OnConVarChanged, false);

 	/* Remove the 'convars' option from the 'sm' console command */

 	g_RootMenu.RemoveRootConsoleCommand("cvars", this);

 	g_PluginSys.RemovePluginsListener(this);

 	/* Remove the 'ConVar' handle type */

 	g_HandleSys.RemoveType(m_ConVarType, g_pCoreIdent);

 }

 /**

  * Orange Box will never use this.

  */

 void ConVarManager::OnSourceModVSPReceived()

 {

 	/**

 	 * Don't bother if the DLL is already hooked.

 	 */

 	if (m_bIsDLLQueryHooked)

 	{

 		return;

 	}

 	/* For later MM:S versions, use the updated API, since it's cleaner. */

 #if defined METAMOD_PLAPI_VERSION

 	int engine = g_SMAPI->GetSourceEngineBuild();

 	if (engine == SOURCE_ENGINE_ORIGINAL || vsp_version < 2)

 	{

 		return;

 	}

 #else

 	if (g_HL2.IsOriginalEngine() || vsp_version < 2)

 	{

 		return;

 	}

 #endif

 #if SOURCE_ENGINE != SE_DARKMESSIAH

 	SH_ADD_HOOK_MEMFUNC(IServerPluginCallbacks, OnQueryCvarValueFinished, vsp_interface, this, &ConVarManager::OnQueryCvarValueFinished, false);

 	m_bIsVSPQueryHooked = true;

 #endif

 }

 bool convar_cache_lookup(const char *name, ConVarInfo **pVar)

 {

 	ConVarInfo **pLookup = convar_cache.retrieve(name);

 	if (pLookup != NULL)

 	{

 		*pVar = *pLookup;

 		return true;

 	}

 	else

 	{

 		return false;

 	}

 }

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

 {

 	/* Only check convars that have not been created by SourceMod's core */

 	ConVarInfo *pInfo;

 	if (!convar_cache_lookup(name, &pInfo))

 	{

 		return;

 	}

 	HandleSecurity sec(NULL, g_pCoreIdent);

 	/* Remove it from our cache */

 	m_ConVars.remove(pInfo);

 	convar_cache.remove(name);

 	/* Now make sure no plugins are referring to this pointer */

 	IPluginIterator *pl_iter = g_PluginSys.GetPluginIterator();

 	while (pl_iter->MorePlugins())

 	{

 		IPlugin *pl = pl_iter->GetPlugin();

 		ConVarList *pConVarList;

 		if (pl->GetProperty("ConVarList", (void **)&pConVarList, true) 

 			&& pConVarList != NULL)

 		{

 			pConVarList->remove(pInfo->pVar);

 		}

 		pl_iter->NextPlugin();

 	}

 	/* Free resources */

 	g_HandleSys.FreeHandle(pInfo->handle, &sec);

 	delete pInfo;

 }

 void ConVarManager::OnPluginUnloaded(IPlugin *plugin)

 {

 	ConVarList *pConVarList;

 	List<ConVarQuery>::iterator iter;

 	/* If plugin has a convar list, free its memory */

 	if (plugin->GetProperty("ConVarList", (void **)&pConVarList, true))

 	{

 		delete pConVarList;

 	}

 	/* Remove convar queries for this plugin that haven't returned results yet */

 	for (iter = m_ConVarQueries.begin(); iter != m_ConVarQueries.end(); iter++)

 	{

 		ConVarQuery &query = (*iter);

 		if (query.pCallback->GetParentRuntime() == plugin->GetRuntime())

 		{

 			m_ConVarQueries.erase(iter);

 		}

 	}

 }

 void ConVarManager::OnHandleDestroy(HandleType_t type, void *object)

 {

 }

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

 {

 	*pSize = sizeof(ConVar) + sizeof(ConVarInfo);

 	return true;

 }

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

 {

 	int argcount = command.ArgC();

 	if (argcount >= 3)

 	{

 		/* Get plugin index that was passed */

 		const char *arg = command.Arg(2);

 		/* Get plugin object */

 		CPlugin *plugin = g_PluginSys.FindPluginByConsoleArg(arg);

 		if (!plugin)

 		{

 			g_RootMenu.ConsolePrint("[SM] Plugin \"%s\" was not found.", arg);

 			return;

 		}

 		/* Get plugin name */

 		const sm_plugininfo_t *plinfo = plugin->GetPublicInfo();

 		const char *plname = IS_STR_FILLED(plinfo->name) ? plinfo->name : plugin->GetFilename();

 		ConVarList *pConVarList;

 		ConVarList::iterator iter;

 		/* If no convar list... */

 		if (!plugin->GetProperty("ConVarList", (void **)&pConVarList))

 		{

 			g_RootMenu.ConsolePrint("[SM] No convars found for: %s", plname);

 			return;

 		}

 		g_RootMenu.ConsolePrint("[SM] Listing %d convars for: %s", pConVarList->size(), plname);

 		g_RootMenu.ConsolePrint("  %-32.31s %s", "[Name]", "[Value]");

 		/* Iterate convar list and display each one */

 		for (iter = pConVarList->begin(); iter != pConVarList->end(); iter++)

 		{

 			const ConVar *pConVar = (*iter);

 			g_RootMenu.ConsolePrint("  %-32.31s %s", pConVar->GetName(), pConVar->GetString()); 

 		}

 		return;

 	}

 	/* Display usage of subcommand */

 	g_RootMenu.ConsolePrint("[SM] Usage: sm cvars <plugin #>");

 }

 Handle_t ConVarManager::CreateConVar(IPluginContext *pContext, const char *name, const char *defaultVal, const char *description, int flags, bool hasMin, float min, bool hasMax, float max)

 {

 	ConVar *pConVar = NULL;

 	ConVarInfo *pInfo = NULL;

 	Handle_t hndl = 0;

 	/* Find out if the convar exists already */

 	pConVar = icvar->FindVar(name);

 	/* If the convar already exists... */

 	if (pConVar)

 	{

 		/* Add convar to plugin's list */

 		AddConVarToPluginList(pContext, pConVar);

 		/* First find out if we already have a handle to it */

 		if (convar_cache_lookup(name, &pInfo))

 		{

 			return pInfo->handle;

 		}

 		else

 		{

 			/* Create and initialize ConVarInfo structure */

 			pInfo = new ConVarInfo();

 			pInfo->sourceMod = false;

 			pInfo->pChangeForward = NULL;

 			pInfo->pVar = pConVar;

 			/* If we don't, then create a new handle from the convar */

 			hndl = g_HandleSys.CreateHandle(m_ConVarType, pInfo, NULL, g_pCoreIdent, NULL);

 			if (hndl == BAD_HANDLE)

 			{

 				delete pInfo;

 				return BAD_HANDLE;

 			}

 			pInfo->handle = hndl;

 			/* Insert struct into caches */

 			m_ConVars.push_back(pInfo);

 			convar_cache.insert(name, pInfo);

 			TrackConCommandBase(pConVar, this);

 			return hndl;

 		}

 	}

 	/* Prevent creating a convar that has the same name as a console command */

 	if (FindCommand(name))

 	{

 		return BAD_HANDLE;

 	}

 	/* Create and initialize ConVarInfo structure */

 	pInfo = new ConVarInfo();

 	pInfo->handle = hndl;

 	pInfo->sourceMod = true;

 	pInfo->pChangeForward = NULL;

 	/* Create a handle from the new convar */

 	hndl = g_HandleSys.CreateHandle(m_ConVarType, pInfo, NULL, g_pCoreIdent, NULL);

 	if (hndl == BAD_HANDLE)

 	{

 		delete pInfo;

 		return BAD_HANDLE;

 	}

 	pInfo->handle = hndl;

 	/* Since an existing convar (or concmd with the same name) was not found , now we can finally create it */

 	pConVar = new ConVar(sm_strdup(name), sm_strdup(defaultVal), flags, sm_strdup(description), hasMin, min, hasMax, max);

 	pInfo->pVar = pConVar;

 	/* Add convar to plugin's list */

 	AddConVarToPluginList(pContext, pConVar);

 	/* Insert struct into caches */

 	m_ConVars.push_back(pInfo);

 	convar_cache.insert(name, pInfo);

 	return hndl;

 }

 Handle_t ConVarManager::FindConVar(const char *name)

 {

 	ConVar *pConVar = NULL;

 	ConVarInfo *pInfo;

 	Handle_t hndl;

 	/* Search for convar */

 	pConVar = icvar->FindVar(name);

 	/* If it doesn't exist, then return an invalid handle */

 	if (!pConVar)

 	{

 		return BAD_HANDLE;

 	}

 	/* At this point, the convar exists. So, find out if we already have a handle */

 	if (convar_cache_lookup(name, &pInfo))

 	{

 		return pInfo->handle;

 	}

 	/* Create and initialize ConVarInfo structure */

 	pInfo = new ConVarInfo();

 	pInfo->sourceMod = false;

 	pInfo->pChangeForward = NULL;

 	pInfo->pVar = pConVar;

 	/* If we don't have a handle, then create a new one */

 	hndl = g_HandleSys.CreateHandle(m_ConVarType, pInfo, NULL, g_pCoreIdent, NULL);

 	if (hndl == BAD_HANDLE)

 	{

 		delete pInfo;

 		return BAD_HANDLE;

 	}

 	pInfo->handle = hndl;

 	/* Insert struct into our caches */

 	m_ConVars.push_back(pInfo);

 	convar_cache.insert(name, pInfo);

 	TrackConCommandBase(pConVar, this);

 	return hndl;

 }

 void ConVarManager::AddConVarChangeListener(const char *name, IConVarChangeListener *pListener)

 {

 	ConVarInfo *pInfo;

 	if (FindConVar(name) == BAD_HANDLE)

 	{

 		return;

 	}

 	/* Find the convar in the lookup trie */

 	if (convar_cache_lookup(name, &pInfo))

 	{

 		pInfo->changeListeners.push_back(pListener);

 	}

 }

 void ConVarManager::RemoveConVarChangeListener(const char *name, IConVarChangeListener *pListener)

 {

 	ConVarInfo *pInfo;

 	/* Find the convar in the lookup trie */

 	if (convar_cache_lookup(name, &pInfo))

 	{

 		pInfo->changeListeners.remove(pListener);

 	}

 }

 void ConVarManager::HookConVarChange(ConVar *pConVar, IPluginFunction *pFunction)

 {

 	ConVarInfo *pInfo;

 	IChangeableForward *pForward;

 	/* Find the convar in the lookup trie */

 	if (convar_cache_lookup(pConVar->GetName(), &pInfo))

 	{

 		/* Get the forward */

 		pForward = pInfo->pChangeForward;

 		/* If forward does not exist, create it */

 		if (!pForward)

 		{

 			pForward = g_Forwards.CreateForwardEx(NULL, ET_Ignore, 3, CONVARCHANGE_PARAMS);

 			pInfo->pChangeForward = pForward;

 		}

 		/* Add function to forward's list */

 		pForward->AddFunction(pFunction);

 	}

 }

 void ConVarManager::UnhookConVarChange(ConVar *pConVar, IPluginFunction *pFunction)

 {

 	ConVarInfo *pInfo;

 	IChangeableForward *pForward;

 	IPluginContext *pContext = pFunction->GetParentContext();

 	/* Find the convar in the lookup trie */

 	if (convar_cache_lookup(pConVar->GetName(), &pInfo))

 	{

 		/* Get the forward */

 		pForward = pInfo->pChangeForward;

 		/* If the forward doesn't exist, we can't unhook anything */

 		if (!pForward)

 		{

 			pContext->ThrowNativeError("Convar \"%s\" has no active hook", pConVar->GetName());

 			return;

 		}

 		/* Remove the function from the forward's list */

 		if (!pForward->RemoveFunction(pFunction))

 		{

 			pContext->ThrowNativeError("Invalid hook callback specified for convar \"%s\"", pConVar->GetName());

 			return;

 		}

 		/* If the forward now has 0 functions in it... */

 		if (pForward->GetFunctionCount() == 0)

 		{

 			/* Free this forward */

 			g_Forwards.ReleaseForward(pForward);

 			pInfo->pChangeForward = NULL;

 		}

 	}

 }

 QueryCvarCookie_t ConVarManager::QueryClientConVar(edict_t *pPlayer, const char *name, IPluginFunction *pCallback, Handle_t hndl)

 {

 	QueryCvarCookie_t cookie = 0;

 #if SOURCE_ENGINE != SE_DARKMESSIAH

 	/* Call StartQueryCvarValue() in either the IVEngineServer or IServerPluginHelpers depending on situation */

 	if (m_bIsDLLQueryHooked)

 	{

 		cookie = engine->StartQueryCvarValue(pPlayer, name);	

 	}

 	else if (m_bIsVSPQueryHooked)

 	{

 		cookie = serverpluginhelpers->StartQueryCvarValue(pPlayer, name);

 	}

 	else

 	{

 		return InvalidQueryCvarCookie;

 	}

 	ConVarQuery query = {cookie, pCallback, hndl};

 	m_ConVarQueries.push_back(query);

 #endif

 	return cookie;

 }

 void ConVarManager::AddConVarToPluginList(IPluginContext *pContext, const ConVar *pConVar)

 {

 	ConVarList *pConVarList;

 	ConVarList::iterator iter;

 	bool inserted = false;

 	const char *orig = pConVar->GetName();

 	IPlugin *plugin = g_PluginSys.FindPluginByContext(pContext->GetContext());

 	/* Check plugin for an existing convar list */

 	if (!plugin->GetProperty("ConVarList", (void **)&pConVarList))

 	{

 		pConVarList = new ConVarList();

 		plugin->SetProperty("ConVarList", pConVarList);

 	}

 	else if (pConVarList->find(pConVar) != pConVarList->end())

 	{

 		/* If convar is already in list, then don't add it */

 		return;

 	}

 	/* Insert convar into list which is sorted alphabetically */

 	for (iter = pConVarList->begin(); iter != pConVarList->end(); iter++)

 	{

 		if (strcmp(orig, (*iter)->GetName()) < 0)

 		{

 			pConVarList->insert(iter, pConVar);

 			inserted = true;

 			break;

 		}

 	}

 	if (!inserted)

 	{

 		pConVarList->push_back(pConVar);

 	}

 }

 #if SOURCE_ENGINE >= SE_ORANGEBOX

 void ConVarManager::OnConVarChanged(ConVar *pConVar, const char *oldValue, float flOldValue)

 #else

 void ConVarManager::OnConVarChanged(ConVar *pConVar, const char *oldValue)

 #endif

 {

 	/* If the values are the same, exit early in order to not trigger callbacks */

 	if (strcmp(pConVar->GetString(), oldValue) == 0)

 	{

 		return;

 	}

 	ConVarInfo *pInfo;

 	/* Find the convar in the lookup trie */

 	if (!convar_cache_lookup(pConVar->GetName(), &pInfo))

 	{

 		return;

 	}

 	IChangeableForward *pForward = pInfo->pChangeForward;

 	if (pInfo->changeListeners.size() != 0)

 	{

 		for (List<IConVarChangeListener *>::iterator i = pInfo->changeListeners.begin();

 			 i != pInfo->changeListeners.end();

 			 i++)

 		{

 #if SOURCE_ENGINE >= SE_ORANGEBOX

 			(*i)->OnConVarChanged(pConVar, oldValue, flOldValue);

 #else

 			(*i)->OnConVarChanged(pConVar, oldValue, atof(oldValue));

 #endif

 		}

 	}

 	if (pForward != NULL)

 	{

 		/* Now call forwards in plugins that have hooked this */

 		pForward->PushCell(pInfo->handle);

 		pForward->PushString(oldValue);

 		pForward->PushString(pConVar->GetString());

 		pForward->Execute(NULL);

 	}

 }

 bool ConVarManager::IsQueryingSupported()

 {

 	return (m_bIsDLLQueryHooked || m_bIsVSPQueryHooked);

 }

 #if SOURCE_ENGINE != SE_DARKMESSIAH

 void ConVarManager::OnQueryCvarValueFinished(QueryCvarCookie_t cookie, edict_t *pPlayer, EQueryCvarValueStatus result, const char *cvarName, const char *cvarValue)

 {

 	IPluginFunction *pCallback = NULL;

 	cell_t value = 0;

 	List<ConVarQuery>::iterator iter;

 	for (iter = m_ConVarQueries.begin(); iter != m_ConVarQueries.end(); iter++)

 	{

 		ConVarQuery &query = (*iter);

 		if (query.cookie == cookie)

 		{

 			pCallback = query.pCallback;

 			value = query.value;

 			break;

 		}

 	}

 	if (pCallback)

 	{

 		cell_t ret;

 		pCallback->PushCell(cookie);

 		pCallback->PushCell(IndexOfEdict(pPlayer));

 		pCallback->PushCell(result);

 		pCallback->PushString(cvarName);

 		if (result == eQueryCvarValueStatus_ValueIntact)

 		{

 			pCallback->PushString(cvarValue);

 		}

 		else

 		{

 			pCallback->PushString("\0");

 		}

 		pCallback->PushCell(value);

 		pCallback->Execute(&ret);

 		m_ConVarQueries.erase(iter);

 	}

 }

 #endif

 HandleError ConVarManager::ReadConVarHandle(Handle_t hndl, ConVar **pVar)

 {

 	ConVarInfo *pInfo;

 	HandleError error;

 	if ((error = g_HandleSys.ReadHandle(hndl, m_ConVarType, NULL, (void **)&pInfo)) != HandleError_None)

 	{

 		return error;

 	}

 	if (pVar)

 	{

 		*pVar = pInfo->pVar;

 	}

 	return error;

 }