/**

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

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

  * SourceMod

  * Copyright (C) 2004-2008 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 "ExtensionSys.h"

 #include <ILibrarySys.h>

 #include "common_logic.h"

 #include "PluginSys.h"

 #include "HandleSys.h"

 #include <assert.h>

 ShareSystem g_ShareSys;

 static unsigned int g_mark_serial = 0;

 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;

 	handlesys->InitAccessDefaults(&sec, NULL);

 	sec.ident = GetIdentRoot();

 	m_TypeRoot = handlesys->CreateType("Identity", this, 0, &sec, NULL, NULL, NULL);

 	m_IfaceType = handlesys->CreateType("Interface", this, 0, NULL, NULL, GetIdentRoot(), NULL);

 	/* Initialize our static identity handle */

 	m_IdentRoot.ident = 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, handlesys);

 	AddInterface(NULL, libsys);

 }

 void ShareSystem::OnSourceModShutdown()

 {

 	if (m_CoreType)

 	{

 		handlesys->RemoveType(m_CoreType, GetIdentRoot());

 	}

 	handlesys->RemoveType(m_IfaceType, GetIdentRoot());

 	handlesys->RemoveType(m_TypeRoot, GetIdentRoot());

 }

 IdentityType_t ShareSystem::FindIdentType(const char *name)

 {

 	HandleType_t type;

 	if (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 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)

 {

 	CNativeOwner *pOwner;

 	pOwner = g_Extensions.GetNativeOwner(myself);

 	pOwner->AddNatives(natives);

 }

 void ShareSystem::DestroyIdentity(IdentityToken_t *identity)

 {

 	HandleSecurity sec;

 	sec.pOwner = GetIdentRoot();

 	sec.pIdentity = GetIdentRoot();

 	handlesys->FreeHandle(identity->ident, &sec);

 	delete identity;

 }

 void ShareSystem::DestroyIdentType(IdentityType_t type)

 {

 	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)

 {

 	assert(false);

 }

 NativeEntry *ShareSystem::FindNative(const char *name)

 {

 	NativeEntry *entry;

 	if (!m_NtvCache.retrieve(name, &entry))

 		return NULL;

 	return entry;

 }

 void ShareSystem::BindNativesToPlugin(CPlugin *pPlugin, bool bCoreOnly)

 {

 	sp_native_t *native;

 	uint32_t i, native_count;

 	IPluginContext *pContext;

 	pContext = pPlugin->GetBaseContext();

 	/* Generate a new serial ID, mark our dependencies with it. */

 	g_mark_serial++;

 	pPlugin->PropagateMarkSerial(g_mark_serial);

 	native_count = pContext->GetNativesNum();

 	for (i = 0; i < native_count; i++)

 	{

 		if (pContext->GetNativeByIndex(i, &native) != SP_ERROR_NONE)

 			continue;

 		// If we're already bound, no need to do anything else.

 		if (native->status == SP_NATIVE_BOUND)

 			continue;

 		/* Otherwise, the native must be in our cache. */

 		NativeEntry *pEntry = FindNative(native->name);

 		if (!pEntry)

 			continue;

 		if (bCoreOnly && pEntry->owner != &g_CoreNatives)

 			continue;

 		BindNativeToPlugin(pPlugin, native, i, pEntry);

 	}

 }

 void ShareSystem::BindNativeToPlugin(CPlugin *pPlugin, NativeEntry *pEntry)

 {

 	uint32_t i;

 	sp_native_t *native;

 	IPluginContext *pContext;

 	pContext = pPlugin->GetBaseContext();

 	if (pContext->FindNativeByName(pEntry->name(), &i) != SP_ERROR_NONE)

 	{

 		return;

 	}

 	if (pContext->GetNativeByIndex(i, &native) != SP_ERROR_NONE)

 	{

 		return;

 	}

 	if (native->status == SP_NATIVE_BOUND)

 	{

 		return;

 	}

 	BindNativeToPlugin(pPlugin, native, i, pEntry);

 }

 void ShareSystem::BindNativeToPlugin(CPlugin *pPlugin, 

 									 sp_native_t *native,

 									 uint32_t index,

 									 NativeEntry *pEntry)

 {

 	/* Mark as bound... we do the rest next. */

 	native->status = SP_NATIVE_BOUND;

 	native->user = pEntry;

 	/* Perform a bind. */

 	native->pfn = pEntry->func();

 	/* We don't bother with dependency crap if the owner is Core. */

 	if (pEntry->owner != &g_CoreNatives)

 	{

 		/* The native is optional, this is a special case */

 		if ((native->flags & SP_NTVFLAG_OPTIONAL) == SP_NTVFLAG_OPTIONAL)

 		{

 			/* Only add if there is a valid owner. */

 			if (pEntry->owner != NULL)

 			{

 				pEntry->owner->AddWeakRef(WeakNative(pPlugin, index));

 			}

 			else

 			{

 				native->status = SP_NATIVE_UNBOUND;

 			}

 		}

 		/* Otherwise, we're a strong dependent and not a weak one */

 		else

 		{

 			/* See if this has already been marked as a dependent.

 			 * If it has, it means this relationship has already occurred, 

 			 * and there is no reason to do it again.

 			 */

 			if (pEntry->owner != pPlugin->ToNativeOwner() 

 				&& pEntry->owner->GetMarkSerial() != g_mark_serial)

 			{

 				/* This has not been marked as a dependency yet */

 				//pPlugin->AddDependency(pEntry->owner);

 				pEntry->owner->AddDependent(pPlugin);

 				pEntry->owner->SetMarkSerial(g_mark_serial);

 			}

 		}

 	}

 }

 NativeEntry *ShareSystem::AddNativeToCache(CNativeOwner *pOwner, const sp_nativeinfo_t *ntv)

 {

 	NativeEntry *pEntry;

 	if ((pEntry = FindNative(ntv->name)) == NULL)

 	{

 		pEntry = new NativeEntry(pOwner, ntv);

 		m_NtvCache.insert(ntv->name, pEntry);

 		return pEntry;

 	}

 	if (pEntry->owner != NULL)

 		return NULL;

 	pEntry->owner = pOwner;

 	pEntry->native = NULL;

 	return pEntry;

 }

 FakeNative::~FakeNative()

 {

 	g_pSourcePawn2->DestroyFakeNative(gate);

 }

 void ShareSystem::ClearNativeFromCache(CNativeOwner *pOwner, const char *name)

 {

 	NativeEntry *pEntry;

 	if ((pEntry = FindNative(name)) == NULL)

 		return;

 	if (pEntry->owner != pOwner)

 		return;

 	pEntry->fake = NULL;

 	pEntry->native = NULL;

 	pEntry->owner = NULL;

 }

 NativeEntry *ShareSystem::AddFakeNative(IPluginFunction *pFunc, const char *name, SPVM_FAKENATIVE_FUNC func)

 {

 	NativeEntry *pEntry;

 	if ((pEntry = FindNative(name)) != NULL && pEntry->owner != NULL)

 		return NULL;

 	ke::AutoPtr<FakeNative> fake(new FakeNative(name, pFunc));

 	fake->gate = g_pSourcePawn2->CreateFakeNative(func, fake);

 	if (!fake->gate)

 		return NULL;

 	CNativeOwner *owner = g_PluginSys.GetPluginByCtx(fake->ctx->GetContext());

 	if (!pEntry)

 	{

 		pEntry = new NativeEntry(owner, fake.take());

 		m_NtvCache.insert(name, pEntry);

 	} else {

 		pEntry->owner = owner;

 		pEntry->fake = fake.take();

 	}

 	return pEntry;

 }

 void ShareSystem::AddCapabilityProvider(IExtension *myself, IFeatureProvider *provider,

 		                                const char *name)

 {

 	if (m_caps.contains(name))

 		return;

 	Capability cap;

 	cap.ext = myself;

 	cap.provider = provider;

 	m_caps.insert(name, cap);

 }

 void ShareSystem::DropCapabilityProvider(IExtension *myself, IFeatureProvider *provider,

 		                                 const char *name)

 {

 	StringHashMap<Capability>::Result r = m_caps.find(name);

 	if (!r.found())

 		return;

 	if (r->value.ext != myself || r->value.provider != provider)

 		return;

 	m_caps.remove(r);

 }

 FeatureStatus ShareSystem::TestFeature(IPluginRuntime *pRuntime, FeatureType feature, 

                                        const char *name)

 {

 	switch (feature)

 	{

 	case FeatureType_Native:

 		return TestNative(pRuntime, name);

 	case FeatureType_Capability:

 		return TestCap(name);

 	default:

 		break;

 	}

 	return FeatureStatus_Unknown;

 }

 FeatureStatus ShareSystem::TestNative(IPluginRuntime *pRuntime, const char *name)

 {

 	uint32_t index;

 	if (pRuntime->FindNativeByName(name, &index) == SP_ERROR_NONE)

 	{

 		sp_native_t *native;

 		if (pRuntime->GetNativeByIndex(index, &native) == SP_ERROR_NONE)

 		{

 			if (native->status == SP_NATIVE_BOUND)

 				return FeatureStatus_Available;

 			else

 				return FeatureStatus_Unknown;

 		}

 	}

 	NativeEntry *entry = FindNative(name);

 	if (!entry)

 		return FeatureStatus_Unknown;

 	if (entry->owner)

 		return FeatureStatus_Available;

 	return FeatureStatus_Unavailable;

 }

 FeatureStatus ShareSystem::TestCap(const char *name)

 {

 	StringHashMap<Capability>::Result r = m_caps.find(name);

 	if (!r.found())

 		return FeatureStatus_Unknown;

 	return r->value.provider->GetFeatureStatus(FeatureType_Capability, name);

 }