/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

Copyright (c) 2006-2012, assimp team
All rights reserved.

Redistribution and use of this software in source and binary forms, 
with or without modification, are permitted provided that the 
following conditions are met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

* Neither the name of the assimp team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

----------------------------------------------------------------------
*/

/** @file  FBXDocument.cpp
 *  @brief Implementation of the FBX DOM classes
 */
#include "AssimpPCH.h"

#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER

#include <functional>

#include "FBXParser.h"
#include "FBXDocument.h"
#include "FBXUtil.h"
#include "FBXImporter.h"
#include "FBXImportSettings.h"
#include "FBXDocumentUtil.h"
#include "FBXProperties.h"

namespace Assimp {
namespace FBX {

using namespace Util;

// ------------------------------------------------------------------------------------------------
LazyObject::LazyObject(uint64_t id, const Element& element, const Document& doc)
: doc(doc)
, element(element)
, id(id)
, flags()
{

}

// ------------------------------------------------------------------------------------------------
LazyObject::~LazyObject()
{

}

// ------------------------------------------------------------------------------------------------
const Object* LazyObject::Get(bool dieOnError)
{
	if(IsBeingConstructed() || FailedToConstruct()) {
		return NULL;
	}

	if (object.get()) {
		return object.get();
	}

	// if this is the root object, we return a dummy since there
	// is no root object int he fbx file - it is just referenced
	// with id 0.
	if(id == 0L) {
		object.reset(new Object(id, element, "Model::RootNode"));
		return object.get();
	}

	const Token& key = element.KeyToken();
	const TokenList& tokens = element.Tokens();

	if(tokens.size() < 3) {
		DOMError("expected at least 3 tokens: id, name and class tag",&element);
	}

	const char* err;
	std::string name = ParseTokenAsString(*tokens[1],err);
	if (err) {
		DOMError(err,&element);
	} 

	// small fix for binary reading: binary fbx files don't use
	// prefixes such as Model:: in front of their names. The
	// loading code expects this at many places, though!
	// so convert the binary representation (a 0x0001) to the
	// double colon notation.
	if(tokens[1]->IsBinary()) {
		for (size_t i = 0; i < name.length(); ++i) {
			if (name[i] == 0x0 && name[i+1] == 0x1) {
				name = name.substr(i+2) + "::" + name.substr(0,i);
			}
		}
	}

	const std::string classtag = ParseTokenAsString(*tokens[2],err);
	if (err) {
		DOMError(err,&element);
	} 

	// prevent recursive calls
	flags |= BEING_CONSTRUCTED;

	try {
		// this needs to be relatively fast since it happens a lot,
		// so avoid constructing strings all the time.
		const char* obtype = key.begin();
		const size_t length = static_cast<size_t>(key.end()-key.begin());
		if (!strncmp(obtype,"Geometry",length)) {
			if (!strcmp(classtag.c_str(),"Mesh")) {
				object.reset(new MeshGeometry(id,element,name,doc));
			}
		}
		else if (!strncmp(obtype,"NodeAttribute",length)) {
			if (!strcmp(classtag.c_str(),"Camera")) {
				object.reset(new Camera(id,element,doc,name));
			}
			else if (!strcmp(classtag.c_str(),"CameraSwitcher")) {
				object.reset(new CameraSwitcher(id,element,doc,name));
			}
			else if (!strcmp(classtag.c_str(),"Light")) {
				object.reset(new Light(id,element,doc,name));
			}
			else if (!strcmp(classtag.c_str(),"Null")) {
				object.reset(new Null(id,element,doc,name));
			}
			else if (!strcmp(classtag.c_str(),"LimbNode")) {
				object.reset(new LimbNode(id,element,doc,name));
			}
		}
		else if (!strncmp(obtype,"Deformer",length)) {
			if (!strcmp(classtag.c_str(),"Cluster")) {
				object.reset(new Cluster(id,element,doc,name));
			}
			else if (!strcmp(classtag.c_str(),"Skin")) {
				object.reset(new Skin(id,element,doc,name));
			}
		}
		else if (!strncmp(obtype,"Model",length)) {
			// FK and IK effectors are not supported
			if (strcmp(classtag.c_str(),"IKEffector") && strcmp(classtag.c_str(),"FKEffector")) {
				object.reset(new Model(id,element,doc,name));
			}
		}
		else if (!strncmp(obtype,"Material",length)) {
			object.reset(new Material(id,element,doc,name));
		}
		else if (!strncmp(obtype,"Texture",length)) {
			object.reset(new Texture(id,element,doc,name));
		}
		else if (!strncmp(obtype,"AnimationStack",length)) {
			object.reset(new AnimationStack(id,element,name,doc));
		}
		else if (!strncmp(obtype,"AnimationLayer",length)) {
			object.reset(new AnimationLayer(id,element,name,doc));
		}
		// note: order matters for these two
		else if (!strncmp(obtype,"AnimationCurve",length)) {
			object.reset(new AnimationCurve(id,element,name,doc));
		}
		else if (!strncmp(obtype,"AnimationCurveNode",length)) {
			object.reset(new AnimationCurveNode(id,element,name,doc));
		}	
	}
	catch(std::exception& ex) {
		flags &= ~BEING_CONSTRUCTED;
		flags |= FAILED_TO_CONSTRUCT;

		if(dieOnError || doc.Settings().strictMode) {
			throw;
		}

		// note: the error message is already formatted, so raw logging is ok
		if(!DefaultLogger::isNullLogger()) {
			DefaultLogger::get()->error(ex.what());
		}
		return NULL;
	}

	if (!object.get()) {
		//DOMError("failed to convert element to DOM object, class: " + classtag + ", name: " + name,&element);
	}

	flags &= ~BEING_CONSTRUCTED;
	return object.get();
}

// ------------------------------------------------------------------------------------------------
Object::Object(uint64_t id, const Element& element, const std::string& name)
: element(element)
, name(name)
, id(id)
{

}

// ------------------------------------------------------------------------------------------------
Object::~Object()
{

}


// ------------------------------------------------------------------------------------------------
FileGlobalSettings::FileGlobalSettings(const Document& doc, boost::shared_ptr<const PropertyTable> props)
: props(props)
, doc(doc) 
{

}


// ------------------------------------------------------------------------------------------------
FileGlobalSettings::~FileGlobalSettings()
{

}


// ------------------------------------------------------------------------------------------------
Document::Document(const Parser& parser, const ImportSettings& settings)
: settings(settings)
, parser(parser)
{
	// cannot use array default initialization syntax because vc8 fails on it
	for (unsigned int i = 0; i < 7; ++i) {
		creationTimeStamp[i] = 0;
	}

	ReadHeader();
	ReadPropertyTemplates();

	ReadGlobalSettings();

	// this order is important, connections need parsed objects to check
	// whether connections are ok or not. Objects may not be evaluated yet,
	// though, since this may require valid connections.
	ReadObjects();
	ReadConnections();
}


// ------------------------------------------------------------------------------------------------
Document::~Document()
{
	BOOST_FOREACH(ObjectMap::value_type& v, objects) {
		delete v.second;
	}
}


// ------------------------------------------------------------------------------------------------
void Document::ReadHeader()
{
	// read ID objects from "Objects" section
	const Scope& sc = parser.GetRootScope();
	const Element* const ehead = sc["FBXHeaderExtension"];
	if(!ehead || !ehead->Compound()) {
		DOMError("no FBXHeaderExtension dictionary found");
	}

	const Scope& shead = *ehead->Compound();
	fbxVersion = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(shead,"FBXVersion",ehead),0));

	// while we maye have some success with newer files, we don't support
	// the older 6.n fbx format
	if(fbxVersion < 7100) {
		DOMError("unsupported, old format version, supported are only FBX 2011, FBX 2012 and FBX 2013");
	}
	if(fbxVersion > 7300) {
		if(Settings().strictMode) {
			DOMError("unsupported, newer format version, supported are only FBX 2011, FBX 2012 and FBX 2013"
				" (turn off strict mode to try anyhow) ");
		}
		else {
			DOMWarning("unsupported, newer format version, supported are only FBX 2011, FBX 2012 and FBX 2013,"
				" trying to read it nevertheless");
		}
	}
	

	const Element* const ecreator = shead["Creator"];
	if(ecreator) {
		creator = ParseTokenAsString(GetRequiredToken(*ecreator,0));
	}

	const Element* const etimestamp = shead["CreationTimeStamp"];
	if(etimestamp && etimestamp->Compound()) {
		const Scope& stimestamp = *etimestamp->Compound();
		creationTimeStamp[0] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Year"),0));
		creationTimeStamp[1] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Month"),0));
		creationTimeStamp[2] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Day"),0));
		creationTimeStamp[3] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Hour"),0));
		creationTimeStamp[4] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Minute"),0));
		creationTimeStamp[5] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Second"),0));
		creationTimeStamp[6] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Millisecond"),0));
	}
}

// ------------------------------------------------------------------------------------------------
void Document::ReadGlobalSettings()
{
	const Scope& sc = parser.GetRootScope();
	const Element* const ehead = sc["GlobalSettings"];
	if(!ehead || !ehead->Compound()) {
		DOMWarning("no GlobalSettings dictionary found");

		globals.reset(new FileGlobalSettings(*this, boost::make_shared<const PropertyTable>()));
		return;
	}

	boost::shared_ptr<const PropertyTable> props = GetPropertyTable(*this, "", *ehead, *ehead->Compound(), true);

	if(!props) {
		DOMError("GlobalSettings dictionary contains no property table");
	}

	globals.reset(new FileGlobalSettings(*this, props));
}


// ------------------------------------------------------------------------------------------------
void Document::ReadObjects()
{
	// read ID objects from "Objects" section
	const Scope& sc = parser.GetRootScope();
	const Element* const eobjects = sc["Objects"];
	if(!eobjects || !eobjects->Compound()) {
		DOMError("no Objects dictionary found");
	}

	// add a dummy entry to represent the Model::RootNode object (id 0),
	// which is only indirectly defined in the input file
	objects[0] = new LazyObject(0L, *eobjects, *this);

	const Scope& sobjects = *eobjects->Compound();
	BOOST_FOREACH(const ElementMap::value_type& el, sobjects.Elements()) {
		
		// extract ID 
		const TokenList& tok = el.second->Tokens();
		
		if (tok.empty()) {
			DOMError("expected ID after object key",el.second);
		}

		const char* err;

		const uint64_t id = ParseTokenAsID(*tok[0], err);
		if(err) {
			DOMError(err,el.second);
		}

		// id=0 is normally implicit
		if(id == 0L) {
			DOMError("encountered object with implicitly defined id 0",el.second);
		}

		if(objects.find(id) != objects.end()) {
			DOMWarning("encountered duplicate object id, ignoring first occurrence",el.second);
		}

		objects[id] = new LazyObject(id, *el.second, *this);

		// grab all animation stacks upfront since there is no listing of them
		if(!strcmp(el.first.c_str(),"AnimationStack")) {
			animationStacks.push_back(id);
		}
	}
}


// ------------------------------------------------------------------------------------------------
void Document::ReadPropertyTemplates()
{
	const Scope& sc = parser.GetRootScope();
	// read property templates from "Definitions" section
	const Element* const edefs = sc["Definitions"];
	if(!edefs || !edefs->Compound()) {
		DOMWarning("no Definitions dictionary found");
		return;
	}

	const Scope& sdefs = *edefs->Compound();
	const ElementCollection otypes = sdefs.GetCollection("ObjectType");
	for(ElementMap::const_iterator it = otypes.first; it != otypes.second; ++it) {
		const Element& el = *(*it).second;
		const Scope* sc = el.Compound();
		if(!sc) {
			DOMWarning("expected nested scope in ObjectType, ignoring",&el);
			continue;
		}

		const TokenList& tok = el.Tokens();
		if(tok.empty()) {
			DOMWarning("expected name for ObjectType element, ignoring",&el);
			continue;
		}

		const std::string& oname = ParseTokenAsString(*tok[0]);

		const ElementCollection templs = sc->GetCollection("PropertyTemplate");
		for(ElementMap::const_iterator it = templs.first; it != templs.second; ++it) {
			const Element& el = *(*it).second;
			const Scope* sc = el.Compound();
			if(!sc) {
				DOMWarning("expected nested scope in PropertyTemplate, ignoring",&el);
				continue;
			}

			const TokenList& tok = el.Tokens();
			if(tok.empty()) {
				DOMWarning("expected name for PropertyTemplate element, ignoring",&el);
				continue;
			}

			const std::string& pname = ParseTokenAsString(*tok[0]);

			const Element* Properties70 = (*sc)["Properties70"];
			if(Properties70) {
				boost::shared_ptr<const PropertyTable> props = boost::make_shared<const PropertyTable>(
					*Properties70,boost::shared_ptr<const PropertyTable>(static_cast<const PropertyTable*>(NULL))
				);

				templates[oname+"."+pname] = props;
			}
		}
	}
}



// ------------------------------------------------------------------------------------------------
void Document::ReadConnections()
{
	const Scope& sc = parser.GetRootScope();
	// read property templates from "Definitions" section
	const Element* const econns = sc["Connections"];
	if(!econns || !econns->Compound()) {
		DOMError("no Connections dictionary found");
	}

	uint64_t insertionOrder = 0l;

	const Scope& sconns = *econns->Compound();
	const ElementCollection conns = sconns.GetCollection("C");
	for(ElementMap::const_iterator it = conns.first; it != conns.second; ++it) {
		const Element& el = *(*it).second;
		const std::string& type = ParseTokenAsString(GetRequiredToken(el,0));
		const uint64_t src = ParseTokenAsID(GetRequiredToken(el,1));
		const uint64_t dest = ParseTokenAsID(GetRequiredToken(el,2));

		// OO = object-object connection
		// OP = object-property connection, in which case the destination property follows the object ID
		const std::string& prop = (type == "OP" ? ParseTokenAsString(GetRequiredToken(el,3)) : "");

		if(objects.find(src) == objects.end()) {
			DOMWarning("source object for connection does not exist",&el);
			continue;
		}

		// dest may be 0 (root node) but we added a dummy object before
		if(objects.find(dest) == objects.end()) {
			DOMWarning("destination object for connection does not exist",&el);
			continue;
		}

		// add new connection
		const Connection* const c = new Connection(insertionOrder++,src,dest,prop,*this);
		src_connections.insert(ConnectionMap::value_type(src,c));  
		dest_connections.insert(ConnectionMap::value_type(dest,c));  
	}
}


// ------------------------------------------------------------------------------------------------
const std::vector<const AnimationStack*>& Document::AnimationStacks() const
{
	if (!animationStacksResolved.empty() || !animationStacks.size()) {
		return animationStacksResolved;
	}

	animationStacksResolved.reserve(animationStacks.size());
	BOOST_FOREACH(uint64_t id, animationStacks) {
		LazyObject* const lazy = GetObject(id);
		const AnimationStack* stack;
		if(!lazy || !(stack = lazy->Get<AnimationStack>())) {
			DOMWarning("failed to read AnimationStack object");
			continue;
		}
		animationStacksResolved.push_back(stack);
	}

	return animationStacksResolved;
}


// ------------------------------------------------------------------------------------------------
LazyObject* Document::GetObject(uint64_t id) const
{
	ObjectMap::const_iterator it = objects.find(id);
	return it == objects.end() ? NULL : (*it).second;
}

#define MAX_CLASSNAMES 6

// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsSequenced(uint64_t id, 
	const ConnectionMap& conns) const
{
	std::vector<const Connection*> temp;

	const std::pair<ConnectionMap::const_iterator,ConnectionMap::const_iterator> range = 
		conns.equal_range(id);

	temp.reserve(std::distance(range.first,range.second));
	for (ConnectionMap::const_iterator it = range.first; it != range.second; ++it) {
		temp.push_back((*it).second);
	}

	std::sort(temp.begin(), temp.end(), std::mem_fun(&Connection::Compare));

	return temp; // NRVO should handle this
}


// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsSequenced(uint64_t id, bool is_src, 
	const ConnectionMap& conns, 
	const char* const* classnames, 
	size_t count) const

{
	ai_assert(classnames);
	ai_assert(count != 0 && count <= MAX_CLASSNAMES);

	size_t lenghts[MAX_CLASSNAMES];

	const size_t c = count;
	for (size_t i = 0; i < c; ++i) {
		lenghts[i] = strlen(classnames[i]);
	}

	std::vector<const Connection*> temp;

	const std::pair<ConnectionMap::const_iterator,ConnectionMap::const_iterator> range = 
		conns.equal_range(id);

	temp.reserve(std::distance(range.first,range.second));
	for (ConnectionMap::const_iterator it = range.first; it != range.second; ++it) {
		const Token& key = (is_src 
			? (*it).second->LazyDestinationObject()
			: (*it).second->LazySourceObject()
		).GetElement().KeyToken();

		const char* obtype = key.begin();

		for (size_t i = 0; i < c; ++i) {
			ai_assert(classnames[i]);
			if(static_cast<size_t>(std::distance(key.begin(),key.end())) == lenghts[i] && !strncmp(classnames[i],obtype,lenghts[i])) {
				obtype = NULL;
				break;
			}
		}

		if(obtype) {
			continue;
		}

		temp.push_back((*it).second);
	}

	std::sort(temp.begin(), temp.end(), std::mem_fun(&Connection::Compare));
	return temp; // NRVO should handle this
}


// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsBySourceSequenced(uint64_t source) const
{
	return GetConnectionsSequenced(source, ConnectionsBySource());
}



// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsBySourceSequenced(uint64_t dest, 
	const char* classname) const
{
	const char* arr[] = {classname};
	return GetConnectionsBySourceSequenced(dest, arr,1);
}



// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsBySourceSequenced(uint64_t source, 
	const char* const* classnames, size_t count) const
{
	return GetConnectionsSequenced(source, true, ConnectionsBySource(),classnames, count);
}


// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsByDestinationSequenced(uint64_t dest, 
	const char* classname) const
{
	const char* arr[] = {classname};
	return GetConnectionsByDestinationSequenced(dest, arr,1);
}


// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsByDestinationSequenced(uint64_t dest) const
{
	return GetConnectionsSequenced(dest, ConnectionsByDestination());
}


// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsByDestinationSequenced(uint64_t dest, 
	const char* const* classnames, size_t count) const

{
	return GetConnectionsSequenced(dest, false, ConnectionsByDestination(),classnames, count);
}


// ------------------------------------------------------------------------------------------------
Connection::Connection(uint64_t insertionOrder,  uint64_t src, uint64_t dest, const std::string& prop, 
	const Document& doc)

: insertionOrder(insertionOrder)
, prop(prop)
, src(src)
, dest(dest)
, doc(doc)
{
	ai_assert(doc.Objects().find(src) != doc.Objects().end());
	// dest may be 0 (root node)
	ai_assert(!dest || doc.Objects().find(dest) != doc.Objects().end());
}


// ------------------------------------------------------------------------------------------------
Connection::~Connection()
{

}


// ------------------------------------------------------------------------------------------------
LazyObject& Connection::LazySourceObject() const
{
	LazyObject* const lazy = doc.GetObject(src);
	ai_assert(lazy);
	return *lazy;
}


// ------------------------------------------------------------------------------------------------
LazyObject& Connection::LazyDestinationObject() const
{
	LazyObject* const lazy = doc.GetObject(dest);
	ai_assert(lazy);
	return *lazy;
}


// ------------------------------------------------------------------------------------------------
const Object* Connection::SourceObject() const
{
	LazyObject* const lazy = doc.GetObject(src);
	ai_assert(lazy);
	return lazy->Get();
}


// ------------------------------------------------------------------------------------------------
const Object* Connection::DestinationObject() const
{
	LazyObject* const lazy = doc.GetObject(dest);
	ai_assert(lazy);
	return lazy->Get();
}

} // !FBX
} // !Assimp

#endif