/**

  * 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: $Id$

  */

 #include "ShareSys.h"

 #include "HandleSys.h"

 #include "ExtensionSys.h"

 #include "LibrarySys.h"

 ShareSystem g_ShareSys;

 ShareSystem::ShareSystem()

 {

 	m_IdentRoot.ident = 0;

 	m_TypeRoot = 0;

 	m_IfaceType = 0;

 	m_CoreType = 0;

 }

 IdentityToken_t *ShareSystem::CreateCoreIdentity()

 {

 	if (!m_CoreType)

 	{

 		m_CoreType = CreateIdentType("CORE");

 	}

 	return CreateIdentity(m_CoreType, this);

 }

 void ShareSystem::Initialize()

 {

 	TypeAccess sec;

 	g_HandleSys.InitAccessDefaults(&sec, NULL);

 	sec.ident = GetIdentRoot();

 	m_TypeRoot = g_HandleSys.CreateType("Identity", this, 0, &sec, NULL, NULL, NULL);

 	m_IfaceType = g_HandleSys.CreateType("Interface", this, 0, NULL, NULL, GetIdentRoot(), NULL);

 	/* Initialize our static identity handle */

 	m_IdentRoot.ident = g_HandleSys.CreateHandle(m_TypeRoot, NULL, NULL, GetIdentRoot(), NULL);

 	/* Add the Handle System and others... they are too innocent and pure to do it themselves */

 	AddInterface(NULL, &g_HandleSys);

 	AddInterface(NULL, &g_LibSys);

 }

 void ShareSystem::OnSourceModShutdown()

 {

 	if (m_CoreType)

 	{

 		g_HandleSys.RemoveType(m_CoreType, GetIdentRoot());

 	}

 	g_HandleSys.RemoveType(m_IfaceType, GetIdentRoot());

 	g_HandleSys.RemoveType(m_TypeRoot, GetIdentRoot());

 }

 IdentityType_t ShareSystem::FindIdentType(const char *name)

 {

 	HandleType_t type;

 	if (g_HandleSys.FindHandleType(name, &type))

 	{

 		if (g_HandleSys.TypeCheck(type, m_TypeRoot))

 		{

 			return type;

 		}

 	}

 	return 0;

 }

 IdentityType_t ShareSystem::CreateIdentType(const char *name)

 {

 	if (!m_TypeRoot)

 	{

 		return 0;

 	}

 	return g_HandleSys.CreateType(name, this, m_TypeRoot, NULL, NULL, GetIdentRoot(), NULL);

 }

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

 {

 	/* THIS WILL NEVER BE CALLED FOR ANYTHING WITH THE IDENTITY TYPE */

 }

 IdentityToken_t *ShareSystem::CreateIdentity(IdentityType_t type, void *ptr)

 {

 	if (!m_TypeRoot)

 	{

 		return 0;

 	}

 	/* :TODO: Cache? */

 	IdentityToken_t *pToken = new IdentityToken_t;

 	HandleSecurity sec;

 	sec.pOwner = sec.pIdentity = GetIdentRoot();

 	pToken->ident = g_HandleSys.CreateHandleInt(type, NULL, &sec, NULL, NULL, true);

 	pToken->ptr = ptr;

 	pToken->type = type;

 	return pToken;

 }

 bool ShareSystem::AddInterface(IExtension *myself, SMInterface *iface)

 {

 	if (!iface)

 	{

 		return false;

 	}

 	IfaceInfo info;

 	info.owner = myself;

 	info.iface = iface;

 	m_Interfaces.push_back(info);

 	return true;

 }

 bool ShareSystem::RequestInterface(const char *iface_name, 

 								   unsigned int iface_vers, 

 								   IExtension *myself, 

 								   SMInterface **pIface)

 {

 	/* See if the interface exists */

 	List<IfaceInfo>::iterator iter;

 	SMInterface *iface;

 	IExtension *iface_owner;

 	bool found = false;

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

 	{

 		IfaceInfo &info = (*iter);

 		iface = info.iface;

 		if (strcmp(iface->GetInterfaceName(), iface_name) == 0)

 		{

 			if (iface->GetInterfaceVersion() == iface_vers

 				|| iface->IsVersionCompatible(iface_vers))

 			{

 				iface_owner = info.owner;

 				found = true;

 				break;

 			}

 		}

 	}

 	if (!found)

 	{

 		return false;

 	}

 	/* Add a dependency node */

 	if (iface_owner)

 	{

 		IfaceInfo info;

 		info.iface = iface;

 		info.owner = iface_owner;

 		g_Extensions.BindDependency(myself, &info);

 	}

 	if (pIface)

 	{

 		*pIface = iface;

 	}

 	return true;

 }

 void ShareSystem::AddNatives(IExtension *myself, const sp_nativeinfo_t *natives)

 {

 	g_Extensions.AddNatives(myself, natives);

 }

 void ShareSystem::DestroyIdentity(IdentityToken_t *identity)

 {

 	HandleSecurity sec;

 	sec.pOwner = GetIdentRoot();

 	sec.pIdentity = GetIdentRoot();

 	g_HandleSys.FreeHandle(identity->ident, &sec);

 	delete identity;

 }

 void ShareSystem::DestroyIdentType(IdentityType_t type)

 {

 	g_HandleSys.RemoveType(type, GetIdentRoot());

 }

 void ShareSystem::RemoveInterfaces(IExtension *pExtension)

 {

 	List<IfaceInfo>::iterator iter = m_Interfaces.begin();

 	while (iter != m_Interfaces.end())

 	{

 		if ((*iter).owner == pExtension)

 		{

 			iter = m_Interfaces.erase(iter);

 		} else {

 			iter++;

 		}

 	}

 }

 void ShareSystem::AddDependency(IExtension *myself, const char *filename, bool require, bool autoload)

 {

 	g_Extensions.AddDependency(myself, filename, require, autoload);

 }

 void ShareSystem::RegisterLibrary(IExtension *myself, const char *name)

 {

 	g_Extensions.AddLibrary(myself, name);

 }

 void ShareSystem::OverrideNatives(IExtension *myself, const sp_nativeinfo_t *natives)

 {

 	g_Extensions.OverrideNatives(myself, natives);

 }