/**

 * 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::OnSourceModStartup(bool late)

{

	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);

}