/**
 * vim: set ts=4 sw=4 tw=99 noet :
 * =============================================================================
 * SourceMod
 * Copyright (C) 2004-2010 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: $Id$
 */

#include <stdlib.h>
#include "ExtensionSys.h"
#include <ILibrarySys.h>
#include <ISourceMod.h>
#include "common_logic.h"
#include "PluginSys.h"

CExtensionManager g_Extensions;
IdentityType_t g_ExtType;

void CExtension::Initialize(const char *filename, const char *path)
{
	m_pAPI = NULL;
	m_pIdentToken = NULL;
	unload_code = 0;
	m_bFullyLoaded = false;
	m_File.assign(filename);
	m_Path.assign(path);
	char real_name[PLATFORM_MAX_PATH];
	libsys->GetFileFromPath(real_name, sizeof(real_name), m_Path.c_str());
	m_RealFile.assign(real_name);
}

CRemoteExtension::CRemoteExtension(IExtensionInterface *pAPI, const char *filename, const char *path)
{
	Initialize(filename, path);
	m_pAPI = pAPI;
}

CLocalExtension::CLocalExtension(const char *filename)
{
	m_PlId = 0;
	m_pLib = NULL;

	char path[PLATFORM_MAX_PATH];

	/* Special case for new bintools binary */
	if (strcmp(filename, "bintools.ext") == 0)
	{
		goto normal;
	}

	/* Zeroth, see if there is an engine specific build in the new place. */
	g_pSM->BuildPath(Path_SM,
		path,
		PLATFORM_MAX_PATH,
		"extensions/%s.%s." PLATFORM_LIB_EXT,
		filename,
		smcore.gamesuffix);

	if (libsys->IsPathFile(path))
	{
		goto found;
	}

	/* COMPAT HACK: One-halfth, if ep2v, see if there is an engine specific build in the new place with old naming */
	if (strcmp(smcore.gamesuffix, "2.tf2") == 0
		|| strcmp(smcore.gamesuffix, "2.dods") == 0
		|| strcmp(smcore.gamesuffix, "2.hl2dm") == 0
		)
	{
		g_pSM->BuildPath(Path_SM,
			path,
			PLATFORM_MAX_PATH,
			"extensions/%s.2.ep2v." PLATFORM_LIB_EXT,
			filename);

		if (libsys->IsPathFile(path))
		{
			goto found;
		}
	}
	else if (strcmp(smcore.gamesuffix, "2.nd") == 0)
	{
		g_pSM->BuildPath(Path_SM,
			path,
			PLATFORM_MAX_PATH,
			"extensions/%s.2.l4d2." PLATFORM_LIB_EXT,
			filename);

		if (libsys->IsPathFile(path))
		{
			goto found;
		}
	}

	/* First see if there is an engine specific build! */
	g_pSM->BuildPath(Path_SM, 
		path, 
		PLATFORM_MAX_PATH,
		"extensions/auto.%s/%s." PLATFORM_LIB_EXT,
		filename,
		smcore.gamesuffix);

	/* Try the "normal" version */
	if (!libsys->IsPathFile(path))
	{
		normal:
		g_pSM->BuildPath(Path_SM,
			path,
			PLATFORM_MAX_PATH,
			"extensions/%s." PLATFORM_LIB_EXT,
			filename);
	}

found:
	Initialize(filename, path);
}

bool CRemoteExtension::Load(char *error, size_t maxlength)
{
	if (!PerformAPICheck(error, maxlength))
	{
		m_pAPI = NULL;
		return false;
	}

	if (!CExtension::Load(error, maxlength))
	{
		m_pAPI = NULL;
		return false;
	}

	return true;
}

bool CLocalExtension::Load(char *error, size_t maxlength)
{
	m_pLib = libsys->OpenLibrary(m_Path.c_str(), error, maxlength);

	if (m_pLib == NULL)
	{
		return false;
	}

	typedef IExtensionInterface *(*GETAPI)();
	GETAPI pfnGetAPI = NULL;

	if ((pfnGetAPI=(GETAPI)m_pLib->GetSymbolAddress("GetSMExtAPI")) == NULL)
	{
		m_pLib->CloseLibrary();
		m_pLib = NULL;
		snprintf(error, maxlength, "Unable to find extension entry point");
		return false;
	}

	m_pAPI = pfnGetAPI();

	/* Check pointer and version */
	if (!PerformAPICheck(error, maxlength))
	{
		m_pLib->CloseLibrary();
		m_pLib = NULL;
		m_pAPI = NULL;
		return false;
	}

	/* Load as MM:S */
	if (m_pAPI->IsMetamodExtension())
	{
		bool ok;
		m_PlId = smcore.LoadMMSPlugin(m_Path.c_str(), &ok, error, maxlength);

		if (!m_PlId || !ok)
		{
			m_pLib->CloseLibrary();
			m_pLib = NULL;
			m_pAPI = NULL;
			return false;
		}
	}

	if (!CExtension::Load(error, maxlength))
	{
		if (m_pAPI->IsMetamodExtension())
		{
			if (m_PlId)
			{
				smcore.UnloadMMSPlugin(m_PlId);
				m_PlId = 0;
			}
		}
		m_pLib->CloseLibrary();
		m_pLib = NULL;
		m_pAPI = NULL;
		return false;
	}

	return true;
}

void CRemoteExtension::Unload()
{
}

void CLocalExtension::Unload()
{
	if (m_pAPI != NULL && m_PlId)
	{
		smcore.UnloadMMSPlugin(m_PlId);
		m_PlId = 0;
	}

	if (m_pLib != NULL)
	{
		m_pLib->CloseLibrary();
		m_pLib = NULL;
	}
}

bool CRemoteExtension::Reload(char *error, size_t maxlength)
{
	snprintf(error, maxlength, "Remote extensions do not support reloading");
	return false;
}

bool CLocalExtension::Reload(char *error, size_t maxlength)
{
	if (m_pLib == NULL) // FIXME: just load it instead?
		return false;
	
	m_pAPI->OnExtensionUnload();
	Unload();
	
	return Load(error, maxlength);
}

bool CRemoteExtension::IsExternal()
{
	return true;
}

bool CLocalExtension::IsExternal()
{
	return false;
}

CExtension::~CExtension()
{
	DestroyIdentity();
}

bool CExtension::PerformAPICheck(char *error, size_t maxlength)
{
	if (!m_pAPI)
	{
		snprintf(error, maxlength, "No IExtensionInterface instance provided");
		return false;
	}
	
	if (m_pAPI->GetExtensionVersion() > SMINTERFACE_EXTENSIONAPI_VERSION)
	{
		snprintf(error, maxlength, "Extension version is too new to load (%d, max is %d)", m_pAPI->GetExtensionVersion(), SMINTERFACE_EXTENSIONAPI_VERSION);
		return false;
	}

	return true;
}

bool CExtension::Load(char *error, size_t maxlength)
{
	CreateIdentity();
	if (!m_pAPI->OnExtensionLoad(this, &g_ShareSys, error, maxlength, !smcore.IsMapLoading()))
	{
		DestroyIdentity();
		return false;
	}
	else
	{
		/* Check if we're past load time */
		if (!smcore.IsMapLoading())
		{
			m_pAPI->OnExtensionsAllLoaded();
		}
	}

	return true;
}

void CExtension::CreateIdentity()
{
	if (m_pIdentToken != NULL)
	{
		return;
	}

	m_pIdentToken = g_ShareSys.CreateIdentity(g_ExtType, this);
}

void CExtension::DestroyIdentity()
{
	if (m_pIdentToken == NULL)
	{
		return;
	}

	g_ShareSys.DestroyIdentity(m_pIdentToken);
	m_pIdentToken = NULL;
}

void CExtension::MarkAllLoaded()
{
	assert(m_bFullyLoaded == false);
	if (!m_bFullyLoaded)
	{
		m_bFullyLoaded = true;
		m_pAPI->OnExtensionsAllLoaded();
	}
}

void CExtension::AddPlugin(CPlugin *pPlugin)
{
	/* Unfortunately we have to do this :( */
	if (m_Dependents.find(pPlugin) != m_Dependents.end())
	{
		m_Dependents.push_back(pPlugin);
	}
}

void CExtension::SetError(const char *error)
{
	m_Error.assign(error);
}

IExtensionInterface *CExtension::GetAPI()
{
	return m_pAPI;
}

const char *CExtension::GetFilename()
{
	return m_RealFile.c_str();
}

const char *CExtension::GetPath() const
{
	return m_Path.c_str();
}

IdentityToken_t *CExtension::GetIdentity()
{
	return m_pIdentToken;
}

bool CRemoteExtension::IsLoaded()
{
	return (m_pAPI != NULL);
}

bool CLocalExtension::IsLoaded()
{
	return (m_pLib != NULL);
}

void CExtension::AddDependency(const IfaceInfo *pInfo)
{
	if (m_Deps.find(*pInfo) == m_Deps.end())
	{
		m_Deps.push_back(*pInfo);
	}
}

bool operator ==(const IfaceInfo &i1, const IfaceInfo &i2)
{
	return (i1.iface == i2.iface) && (i1.owner == i2.owner);
}

void CExtension::AddChildDependent(CExtension *pOther, SMInterface *iface)
{
	IfaceInfo info;
	info.iface = iface;
	info.owner = pOther;

	List<IfaceInfo>::iterator iter;
	for (iter = m_ChildDeps.begin();
		 iter != m_ChildDeps.end();
		 iter++)
	{
		IfaceInfo &other = (*iter);
		if (other == info)
		{
			return;
		}
	}

	m_ChildDeps.push_back(info);
}

ITERATOR *CExtension::FindFirstDependency(IExtension **pOwner, SMInterface **pInterface)
{
	List<IfaceInfo>::iterator iter = m_Deps.begin();

	if (iter == m_Deps.end())
	{
		return NULL;
	}

	if (pOwner)
	{
		*pOwner = (*iter).owner;
	}
	if (pInterface)
	{
		*pInterface = (*iter).iface;
	}

	List<IfaceInfo>::iterator *pIter = new List<IfaceInfo>::iterator(iter);

	return (ITERATOR *)pIter;
}

bool CExtension::FindNextDependency(ITERATOR *iter, IExtension **pOwner, SMInterface **pInterface)
{
	List<IfaceInfo>::iterator *pIter = (List<IfaceInfo>::iterator *)iter;
	List<IfaceInfo>::iterator _iter;

	if (_iter == m_Deps.end())
	{
		return false;
	}

	_iter++;

	if (pOwner)
	{
		*pOwner = (*_iter).owner;
	}
	if (pInterface)
	{
		*pInterface = (*_iter).iface;
	}

	*pIter = _iter;

	if (_iter == m_Deps.end())
	{
		return false;
	}

	return true;
}

void CExtension::FreeDependencyIterator(ITERATOR *iter)
{
	List<IfaceInfo>::iterator *pIter = (List<IfaceInfo>::iterator *)iter;

	delete pIter;
}

void CExtension::AddInterface(SMInterface *pInterface)
{
	m_Interfaces.push_back(pInterface);
}

bool CExtension::IsRunning(char *error, size_t maxlength)
{
	if (!IsLoaded())
	{
		if (error)
		{
			snprintf(error, maxlength, "%s", m_Error.c_str());
		}
		return false;
	}

	return m_pAPI->QueryRunning(error, maxlength);
}

void CExtension::AddLibrary(const char *library)
{
	m_Libraries.push_back(library);
}

/*********************
 * EXTENSION MANAGER *
 *********************/

void CExtensionManager::OnSourceModAllInitialized()
{
	g_ExtType = g_ShareSys.CreateIdentType("EXTENSION");
	pluginsys->AddPluginsListener(this);
	rootmenu->AddRootConsoleCommand("exts", "Manage extensions", this);
	g_ShareSys.AddInterface(NULL, this);
}

void CExtensionManager::OnSourceModShutdown()
{
	rootmenu->RemoveRootConsoleCommand("exts", this);
	pluginsys->RemovePluginsListener(this);
	g_ShareSys.DestroyIdentType(g_ExtType);
}

void CExtensionManager::Shutdown()
{
	List<CExtension *>::iterator iter;

	while ((iter = m_Libs.begin()) != m_Libs.end())
	{
		UnloadExtension((*iter));
	}
}

void CExtensionManager::TryAutoload()
{
	char path[PLATFORM_MAX_PATH];

	g_pSM->BuildPath(Path_SM, path, sizeof(path), "extensions");

	IDirectory *pDir = libsys->OpenDirectory(path);
	if (!pDir)
	{
		return;
	}

	const char *lfile;
	size_t len;
	while (pDir->MoreFiles())
	{
		if (pDir->IsEntryDirectory())
		{
			pDir->NextEntry();
			continue;
		}

		lfile = pDir->GetEntryName();
		len = strlen(lfile);
		if (len <= 9) /* size of ".autoload" */
		{
			pDir->NextEntry();
			continue;
		}

		if (strcmp(&lfile[len - 9], ".autoload") != 0)
		{
			pDir->NextEntry();
			continue;
		}

		char file[PLATFORM_MAX_PATH];
		len = smcore.Format(file, sizeof(file), "%s", lfile);
		strcpy(&file[len - 9], ".ext");

		LoadAutoExtension(file);
		
		pDir->NextEntry();
	}
}

IExtension *CExtensionManager::LoadAutoExtension(const char *path)
{
	/* Remove platform extension if it's there. Compat hack. */
	const char *ext = libsys->GetFileExtension(path);
	if (strcmp(ext, PLATFORM_LIB_EXT) == 0)
	{
		char path2[PLATFORM_MAX_PATH];
		smcore.Format(path2, sizeof(path2), "%s", path);
		path2[strlen(path) - strlen(PLATFORM_LIB_EXT) - 1] = '\0';
		return LoadAutoExtension(path2);
	}

	IExtension *pAlready;
	if ((pAlready=FindExtensionByFile(path)) != NULL)
	{
		return pAlready;
	}

	char error[256];
	CExtension *p = new CLocalExtension(path);

	/* We put us in the list beforehand so extensions that check for each other
	 * won't recursively load each other.
	 */
	m_Libs.push_back(p);

	if (!p->Load(error, sizeof(error)) || !p->IsLoaded())
	{
		smcore.LogError("[SM] Unable to load extension \"%s\": %s", path, error);
		p->SetError(error);
	}

	return p;
}

IExtension *CExtensionManager::FindExtensionByFile(const char *file)
{
	List<CExtension *>::iterator iter;
	CExtension *pExt;

	/* Chomp off the path */
	char lookup[PLATFORM_MAX_PATH];
	libsys->GetFileFromPath(lookup, sizeof(lookup), file);

	for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++)
	{
		pExt = (*iter);
		if (pExt->IsSameFile(lookup))
		{
			return pExt;
		}
	}

	return NULL;
}

IExtension *CExtensionManager::FindExtensionByName(const char *ext)
{
	List<CExtension *>::iterator iter;
	CExtension *pExt;
	IExtensionInterface *pAPI;
	const char *name;

	for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++)
	{
		pExt = (*iter);
		if (!pExt->IsLoaded())
		{
			continue;
		}
		if ((pAPI = pExt->GetAPI()) == NULL)
		{
			continue;
		}
		name = pAPI->GetExtensionName();
		if (!name)
		{
			continue;
		}
		if (strcmp(name, ext) == 0)
		{
			return pExt;
		}
	}

	return NULL;
}

IExtension *CExtensionManager::LoadExtension(const char *file, char *error, size_t maxlength)
{
	/* Remove platform extension if it's there. Compat hack. */
	const char *ext = libsys->GetFileExtension(file);
	if (strcmp(ext, PLATFORM_LIB_EXT) == 0)
	{
		char path2[PLATFORM_MAX_PATH];
		smcore.Format(path2, sizeof(path2), "%s", file);
		path2[strlen(file) - strlen(PLATFORM_LIB_EXT) - 1] = '\0';
		return LoadExtension(path2, error, maxlength);
	}

	IExtension *pAlready;
	if ((pAlready=FindExtensionByFile(file)) != NULL)
	{
		return pAlready;
	}

	CExtension *pExt = new CLocalExtension(file);

	if (!pExt->Load(error, maxlength) || !pExt->IsLoaded())
	{
		pExt->Unload();
		delete pExt;
		return NULL;
	}

	/* :TODO: do QueryRunning check if the map is loaded */

	m_Libs.push_back(pExt);

	return pExt;
}

void CExtensionManager::BindDependency(IExtension *pRequester, IfaceInfo *pInfo)
{
	CExtension *pExt = (CExtension *)pRequester;
	CExtension *pOwner = (CExtension *)pInfo->owner;

	pExt->AddDependency(pInfo);

	IExtensionInterface *pAPI = pExt->GetAPI();
	if (pAPI && !pAPI->QueryInterfaceDrop(pInfo->iface))
	{
		pOwner->AddChildDependent(pExt, pInfo->iface);
	}
}

void CExtensionManager::AddRawDependency(IExtension *ext, IdentityToken_t *other, void *iface)
{
	CExtension *pExt = (CExtension *)ext;
	CExtension *pOwner = GetExtensionFromIdent(other);

	IfaceInfo info;

	info.iface = (SMInterface *)iface;
	info.owner = pOwner;

	pExt->AddDependency(&info);
	pOwner->AddChildDependent(pExt, (SMInterface *)iface);
}

void CExtensionManager::AddInterface(IExtension *pOwner, SMInterface *pInterface)
{
	CExtension *pExt = (CExtension *)pOwner;

	pExt->AddInterface(pInterface);
}

void CExtensionManager::BindChildPlugin(IExtension *pParent, SMPlugin *pPlugin)
{
	CExtension *pExt = (CExtension *)pParent;

	pExt->AddPlugin(static_cast<CPlugin *>(pPlugin));
}

void CExtensionManager::OnPluginDestroyed(IPlugin *plugin)
{
	List<CExtension *>::iterator iter;

	for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++)
	{
		(*iter)->DropRefsTo(static_cast<CPlugin *>(plugin));
	}
}

CExtension *CExtensionManager::FindByOrder(unsigned int num)
{
	if (num < 1 || num > m_Libs.size())
	{
		return NULL;
	}

	List<CExtension *>::iterator iter = m_Libs.begin();

	while (iter != m_Libs.end())
	{
		if (--num == 0)
		{
			return (*iter);
		}
		iter++;
	}

	return NULL;
}

bool CExtensionManager::UnloadExtension(IExtension *_pExt)
{
	if (!_pExt)
		return false;

	CExtension *pExt = (CExtension *)_pExt;

	if (m_Libs.find(pExt) == m_Libs.end())
		return false;

	/* Tell it to unload */
	if (pExt->IsLoaded())
		pExt->GetAPI()->OnExtensionUnload();

	// Remove us from internal lists. Note that because we do this, it's
	// possible that our extension could be added back if another plugin
	// tries to load during this process. If we ever find this to happen,
	// we can just block plugin loading.
	g_ShareSys.RemoveInterfaces(_pExt);
	m_Libs.remove(pExt);

	List<CExtension *> UnloadQueue;

	/* Handle dependencies */
	if (pExt->IsLoaded())
	{
		/* Unload any dependent plugins */
		List<CPlugin *>::iterator p_iter = pExt->m_Dependents.begin();
		while (p_iter != pExt->m_Dependents.end())
		{
			/* We have to manually unlink ourselves here, since we're no longer being managed */
			scripts->UnloadPlugin((*p_iter));
			p_iter = pExt->m_Dependents.erase(p_iter);
		}

		List<String>::iterator s_iter;
		for (s_iter = pExt->m_Libraries.begin();
			 s_iter != pExt->m_Libraries.end();
			 s_iter++)
		{
			scripts->OnLibraryAction((*s_iter).c_str(), LibraryAction_Removed);
		}

		/* Notify and/or unload all dependencies */
		List<CExtension *>::iterator c_iter;
		CExtension *pDep;
		IExtensionInterface *pAPI;
		for (c_iter = m_Libs.begin(); c_iter != m_Libs.end(); c_iter++)
		{
			pDep = (*c_iter);
			if ((pAPI=pDep->GetAPI()) == NULL)
				continue;
			if (pDep == pExt)
				continue;
			/* Now, get its dependency list */
			bool dropped = false;
			List<IfaceInfo>::iterator i_iter = pDep->m_Deps.begin();
			while (i_iter != pDep->m_Deps.end())
			{
				if ((*i_iter).owner == _pExt)
				{
					if (!pAPI->QueryInterfaceDrop((*i_iter).iface))
					{
						if (!dropped)
						{
							dropped = true;
							UnloadQueue.push_back(pDep);
						}
					}
					pAPI->NotifyInterfaceDrop((*i_iter).iface);
					i_iter = pDep->m_Deps.erase(i_iter);
				}
				else
				{
					i_iter++;
				}
			}
			/* Flush out any back references to this plugin */
			i_iter = pDep->m_ChildDeps.begin();
			while (i_iter != pDep->m_ChildDeps.end())
			{
				if ((*i_iter).owner == pExt)
					i_iter = pDep->m_ChildDeps.erase(i_iter);
				else
					i_iter++;
			}
		}

		/* Unbind our natives from Core */
		pExt->DropEverything();
	}

	IdentityToken_t *pIdentity;
	if ((pIdentity = pExt->GetIdentity()) != NULL)
	{
		SMGlobalClass *glob = SMGlobalClass::head;
		while (glob)
		{
			glob->OnSourceModIdentityDropped(pIdentity);
			glob = glob->m_pGlobalClassNext;
		}
	}

	// Everything has been informed that we're unloading, so give the
	// extension one last notification.
	if (pExt->IsLoaded() && pExt->GetAPI()->GetExtensionVersion() >= 7)
		pExt->GetAPI()->OnDependenciesDropped();

	pExt->Unload();
	delete pExt;

	List<CExtension *>::iterator iter;
	for (iter=UnloadQueue.begin(); iter!=UnloadQueue.end(); iter++)
	{
		/* NOTE: This is safe because the unload function backs out of anything not present */
		UnloadExtension((*iter));
	}

	return true;
}

void CExtensionManager::MarkAllLoaded()
{
	List<CExtension *>::iterator iter;
	CExtension *pExt;

	for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++)
	{
		pExt = (*iter);
		if (!pExt->IsLoaded())
		{
			continue;
		}
		if (pExt->m_bFullyLoaded)
		{
			continue;
		}
		pExt->MarkAllLoaded();
	}
}

void CExtensionManager::AddDependency(IExtension *pSource, const char *file, bool required, bool autoload)
{
	/* This function doesn't really need to do anything now.  We make sure the 
	 * other extension is loaded, but handling of dependencies is really done 
	 * by the interface fetcher.
	 */
	if (required || autoload)
	{
		LoadAutoExtension(file);
	}
}

void CExtensionManager::OnRootConsoleCommand(const char *cmdname, const CCommand &command)
{
	int argcount = smcore.Argc(command);
	if (argcount >= 3)
	{
		const char *cmd = smcore.Arg(command, 2);
		if (strcmp(cmd, "list") == 0)
		{
			List<CExtension *>::iterator iter;
			CExtension *pExt;
			unsigned int num = 1;
			switch (m_Libs.size())
			{
			case 1:
				{
					rootmenu->ConsolePrint("[SM] Displaying 1 extension:");
					break;
				}
			case 0:
				{
					rootmenu->ConsolePrint("[SM] No extensions are loaded.");
					break;
				}
			default:
				{
					rootmenu->ConsolePrint("[SM] Displaying %d extensions:", m_Libs.size());
					break;
				}
			}
			for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++,num++)
			{
				pExt = (*iter);
				if (pExt->IsLoaded())
				{
					char error[255];
					if (!pExt->IsRunning(error, sizeof(error)))
					{
						rootmenu->ConsolePrint("[%02d] <FAILED> file \"%s\": %s", num, pExt->GetFilename(), error);
					}
					else
					{
						IExtensionInterface *pAPI = pExt->GetAPI();
						const char *name = pAPI->GetExtensionName();
						const char *version = pAPI->GetExtensionVerString();
						const char *descr = pAPI->GetExtensionDescription();
						rootmenu->ConsolePrint("[%02d] %s (%s): %s", num, name, version, descr);
					}
				} else {
					rootmenu->ConsolePrint("[%02d] <FAILED> file \"%s\": %s", num, pExt->GetFilename(), pExt->m_Error.c_str());
				}
			}
			return;
		}
		else if (strcmp(cmd, "load") == 0)
		{
			if (argcount < 4)
			{
				rootmenu->ConsolePrint("[SM] Usage: sm exts load <file>");
				return;
			}

			const char *filename = smcore.Arg(command, 3);
			char path[PLATFORM_MAX_PATH];
			char error[256];

			smcore.Format(path, sizeof(path), "%s%s%s", filename, !strstr(filename, ".ext") ? ".ext" : "",
				!strstr(filename, "." PLATFORM_LIB_EXT) ? "." PLATFORM_LIB_EXT : "");
			
			if (FindExtensionByFile(path) != NULL)
			{
				rootmenu->ConsolePrint("[SM] Extension %s is already loaded.", path);
				return;
			}
			
			if (LoadExtension(path, error, sizeof(error)))
			{
				rootmenu->ConsolePrint("[SM] Loaded extension %s successfully.", path);
			} else
			{
				rootmenu->ConsolePrint("[SM] Extension %s failed to load: %s", path, error);
			}
			
			return;
		}
		else if (strcmp(cmd, "info") == 0)
		{
			if (argcount < 4)
			{
				rootmenu->ConsolePrint("[SM] Usage: sm exts info <#>");
				return;
			}

			const char *sId = smcore.Arg(command, 3);
			unsigned int id = atoi(sId);
			if (id <= 0)
			{
				rootmenu->ConsolePrint("[SM] Usage: sm exts info <#>");
				return;
			}

			if (m_Libs.size() == 0)
			{
				rootmenu->ConsolePrint("[SM] No extensions are loaded.");
				return;
			}

			if (id > m_Libs.size())
			{
				rootmenu->ConsolePrint("[SM] No extension was found with id %d.", id);
				return;
			}

			List<CExtension *>::iterator iter = m_Libs.begin();
			CExtension *pExt = NULL;
			while (iter != m_Libs.end())
			{
				if (--id == 0)
				{
					pExt = (*iter);
					break;
				}
				iter++;
			}
			/* This should never happen */
			if (!pExt)
			{
				rootmenu->ConsolePrint("[SM] No extension was found with id %d.", id);
				return;
			}

			if (!pExt->IsLoaded())
			{
				rootmenu->ConsolePrint(" File: %s", pExt->GetFilename());
				rootmenu->ConsolePrint(" Loaded: No (%s)", pExt->m_Error.c_str());
			}
			else
			{
				char error[255];
				if (!pExt->IsRunning(error, sizeof(error)))
				{
					rootmenu->ConsolePrint(" File: %s", pExt->GetFilename());
					rootmenu->ConsolePrint(" Loaded: Yes");
					rootmenu->ConsolePrint(" Running: No (%s)", error);
				}
				else
				{
					IExtensionInterface *pAPI = pExt->GetAPI();
					rootmenu->ConsolePrint(" File: %s", pExt->GetFilename());
					rootmenu->ConsolePrint(" Loaded: Yes (version %s)", pAPI->GetExtensionVerString());
					rootmenu->ConsolePrint(" Name: %s (%s)", pAPI->GetExtensionName(), pAPI->GetExtensionDescription());
					rootmenu->ConsolePrint(" Author: %s (%s)", pAPI->GetExtensionAuthor(), pAPI->GetExtensionURL());
					rootmenu->ConsolePrint(" Binary info: API version %d (compiled %s)", pAPI->GetExtensionVersion(), pAPI->GetExtensionDateString());

					if (pExt->IsExternal())
					{
						rootmenu->ConsolePrint(" Method: Loaded by Metamod:Source, attached to SourceMod");
					}
					else if (pAPI->IsMetamodExtension())
					{
						rootmenu->ConsolePrint(" Method: Loaded by SourceMod, attached to Metamod:Source");
					}
					else
					{
						rootmenu->ConsolePrint(" Method: Loaded by SourceMod");
					}
				}
			}
			return;
		}
		else if (strcmp(cmd, "unload") == 0)
		{
			if (argcount < 4)
			{
				rootmenu->ConsolePrint("[SM] Usage: sm exts unload <#> [code]");
				return;
			}

			const char *arg = smcore.Arg(command, 3);
			unsigned int num = atoi(arg);
			CExtension *pExt = FindByOrder(num);

			if (!pExt)
			{
				rootmenu->ConsolePrint("[SM] Extension number %d was not found.", num);
				return;
			}

			if (argcount > 4 && pExt->unload_code)
			{
				const char *unload = smcore.Arg(command, 4);
				if (pExt->unload_code == (unsigned)atoi(unload))
				{
					char filename[PLATFORM_MAX_PATH];
					snprintf(filename, PLATFORM_MAX_PATH, "%s", pExt->GetFilename());
					UnloadExtension(pExt);
					rootmenu->ConsolePrint("[SM] Extension %s is now unloaded.", filename);
				}
				else
				{
					rootmenu->ConsolePrint("[SM] Please try again, the correct unload code is \"%d\"", pExt->unload_code);
				}
				return;
			}

			if (!pExt->IsLoaded() 
				|| (!pExt->m_ChildDeps.size() && !pExt->m_Dependents.size()))
			{
				char filename[PLATFORM_MAX_PATH];
				snprintf(filename, PLATFORM_MAX_PATH, "%s", pExt->GetFilename());
				UnloadExtension(pExt);
				rootmenu->ConsolePrint("[SM] Extension %s is now unloaded.", filename);
				return;
			}
			else
			{
				List<CPlugin *> plugins;
				if (pExt->m_ChildDeps.size())
				{
					rootmenu->ConsolePrint("[SM] Unloading %s will unload the following extensions: ", pExt->GetFilename());
					List<CExtension *>::iterator iter;
					CExtension *pOther;
					/* Get list of all extensions */
					for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++)
					{
						List<IfaceInfo>::iterator i_iter;
						pOther = (*iter);
						if (!pOther->IsLoaded() || pOther == pExt)
						{
							continue;
						}
						/* Get their dependencies */
						for (i_iter=pOther->m_Deps.begin();
							 i_iter!=pOther->m_Deps.end();
							 i_iter++)
						{
							/* Is this dependency to us? */
							if ((*i_iter).owner != pExt)
							{
								continue;
							}
							/* Will our dependent care? */
							if (!pExt->GetAPI()->QueryInterfaceDrop((*i_iter).iface))
							{
								rootmenu->ConsolePrint(" -> %s", pExt->GetFilename());
								/* Add to plugin unload list */
								List<CPlugin *>::iterator p_iter;
								for (p_iter=pOther->m_Dependents.begin();
									 p_iter!=pOther->m_Dependents.end();
									 p_iter++)
								{
									if (plugins.find((*p_iter)) == plugins.end())
									{
										plugins.push_back((*p_iter));
									}
								}
							}
						}
					}
				}
				if (pExt->m_Dependents.size())
				{
					rootmenu->ConsolePrint("[SM] Unloading %s will unload the following plugins: ", pExt->GetFilename());
					List<CPlugin *>::iterator iter;
					CPlugin *pPlugin;
					for (iter = pExt->m_Dependents.begin(); iter != pExt->m_Dependents.end(); iter++)
					{
						pPlugin = (*iter);
						if (plugins.find(pPlugin) == plugins.end())
						{
							plugins.push_back(pPlugin);
						}
					}
					for (iter = plugins.begin(); iter != plugins.end(); iter++)
					{
						pPlugin = (*iter);
						rootmenu->ConsolePrint(" -> %s", pPlugin->GetFilename());
					}
				}
				srand(static_cast<int>(time(NULL)));
				pExt->unload_code = (rand() % 877) + 123;	//123 to 999
				rootmenu->ConsolePrint("[SM] To verify unloading %s, please use the following: ", pExt->GetFilename());
				rootmenu->ConsolePrint("[SM] sm exts unload %d %d", num, pExt->unload_code);

				return;
			}
		}
		else if (strcmp(cmd, "reload") == 0)
		{
			if (argcount < 4)
			{
				rootmenu->ConsolePrint("[SM] Usage: sm exts reload <#>");
				return;
			}
			
			const char *arg = smcore.Arg(command, 3);
			unsigned int num = atoi(arg);
			CExtension *pExt = FindByOrder(num);

			if (!pExt)
			{
				rootmenu->ConsolePrint("[SM] Extension number %d was not found.", num);
				return;
			}
			
			if (pExt->IsLoaded())
			{
				char filename[PLATFORM_MAX_PATH];
				char error[255];
				
				snprintf(filename, PLATFORM_MAX_PATH, "%s", pExt->GetFilename());
				
				if (pExt->Reload(error, sizeof(error)))
				{
					rootmenu->ConsolePrint("[SM] Extension %s is now reloaded.", filename);
				}
				else
				{
					rootmenu->ConsolePrint("[SM] Extension %s failed to reload: %s", filename, error);
				}
					
				return;
			} 
			else
			{
				rootmenu->ConsolePrint("[SM] Extension %s is not loaded.", pExt->GetFilename());
				
				return;
			}
			
		}
	}

	rootmenu->ConsolePrint("SourceMod Extensions Menu:");
	rootmenu->DrawGenericOption("info", "Extra extension information");
	rootmenu->DrawGenericOption("list", "List extensions");
	rootmenu->DrawGenericOption("load", "Load an extension");
	rootmenu->DrawGenericOption("reload", "Reload an extension");
	rootmenu->DrawGenericOption("unload", "Unload an extension");
}

CExtension *CExtensionManager::GetExtensionFromIdent(IdentityToken_t *ptr)
{
	if (ptr->type == g_ExtType)
	{
		return (CExtension *)(ptr->ptr);
	}

	return NULL;
}

CExtensionManager::CExtensionManager()
{
}

CExtensionManager::~CExtensionManager()
{
}

void CExtensionManager::AddLibrary(IExtension *pSource, const char *library)
{
	CExtension *pExt = (CExtension *)pSource;
	pExt->AddLibrary(library);
	scripts->OnLibraryAction(library, LibraryAction_Added);
}

bool CExtensionManager::LibraryExists(const char *library)
{
	CExtension *pExt;

	for (List<CExtension *>::iterator iter = m_Libs.begin();
		 iter != m_Libs.end();
		 iter++)
	{
		pExt = (*iter);
		for (List<String>::iterator s_iter = pExt->m_Libraries.begin();
			 s_iter != pExt->m_Libraries.end();
			 s_iter++)
		{
			if ((*s_iter).compare(library) == 0)
			{
				return true;
			}
		}
	}

	return false;
}

IExtension *CExtensionManager::LoadExternal(IExtensionInterface *pInterface,
											const char *filepath,
											const char *filename,
											char *error,
											size_t maxlength)
{
	IExtension *pAlready;
	if ((pAlready=FindExtensionByFile(filename)) != NULL)
	{
		return pAlready;
	}

	CExtension *pExt = new CRemoteExtension(pInterface, filename, filepath);

	if (!pExt->Load(error, maxlength) || !pExt->IsLoaded())
	{
		pExt->Unload();
		delete pExt;
		return NULL;
	}

	m_Libs.push_back(pExt);

	return pExt;
}

void CExtensionManager::CallOnCoreMapStart(edict_t *pEdictList, int edictCount, int clientMax)
{
	IExtensionInterface *pAPI;
	List<CExtension *>::iterator iter;

	for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++)
	{
		if ((pAPI = (*iter)->GetAPI()) == NULL)
		{
			continue;
		}
		if (pAPI->GetExtensionVersion() > 3)
		{
			pAPI->OnCoreMapStart(pEdictList, edictCount, clientMax);
		}
	}
}

const CVector<IExtension *> *CExtensionManager::ListExtensions()
{
	CVector<IExtension *> *list = new CVector<IExtension *>();
	for (List<CExtension *>::iterator iter = m_Libs.begin(); iter != m_Libs.end(); iter++)
		list->push_back(*iter);
	return list;
}

void CExtensionManager::FreeExtensionList(const CVector<IExtension *> *list)
{
	delete const_cast<CVector<IExtension *> *>(list);
}

bool CLocalExtension::IsSameFile(const char *file)
{
	/* Only care about the shortened name. */
	return strcmp(file, m_File.c_str()) == 0;
}

bool CRemoteExtension::IsSameFile(const char *file)
{
	/* :TODO: this could be better, but no one uses this API anyway. */
	return strcmp(file, m_Path.c_str()) == 0;
}

