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

Copyright (c) 2006-2012, assimp team

All rights reserved.

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  following disclaimer.

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*/

/** @file  MD5Parser.cpp 
 *  @brief Implementation of the MD5 parser class
 */
#include "AssimpPCH.h"

// internal headers
#include "MD5Loader.h"
#include "MaterialSystem.h"
#include "fast_atof.h"
#include "ParsingUtils.h"
#include "StringComparison.h"

using namespace Assimp;
using namespace Assimp::MD5;

// ------------------------------------------------------------------------------------------------
// Parse the segment structure fo a MD5 file
MD5Parser::MD5Parser(char* _buffer, unsigned int _fileSize )
{
	ai_assert(NULL != _buffer && 0 != _fileSize);

	buffer = _buffer;
	fileSize = _fileSize;
	lineNumber = 0;

	DefaultLogger::get()->debug("MD5Parser begin");

	// parse the file header
	ParseHeader();

	// and read all sections until we're finished
	bool running = true;
	while (running)	{
		mSections.push_back(Section());
		Section& sec = mSections.back();
		if(!ParseSection(sec))	{
			break;
		}
	}

	if ( !DefaultLogger::isNullLogger())	{
		char szBuffer[128]; // should be sufficiently large
		::sprintf(szBuffer,"MD5Parser end. Parsed %i sections",(int)mSections.size());
		DefaultLogger::get()->debug(szBuffer);
	}
}

// ------------------------------------------------------------------------------------------------
// Report error to the log stream
/*static*/ void MD5Parser::ReportError (const char* error, unsigned int line)
{
	char szBuffer[1024];
	::sprintf(szBuffer,"[MD5] Line %i: %s",line,error);
	throw DeadlyImportError(szBuffer);
}

// ------------------------------------------------------------------------------------------------
// Report warning to the log stream
/*static*/ void MD5Parser::ReportWarning (const char* warn, unsigned int line)
{
	char szBuffer[1024]; 
	::sprintf(szBuffer,"[MD5] Line %i: %s",line,warn);
	DefaultLogger::get()->warn(szBuffer);
}

// ------------------------------------------------------------------------------------------------
// Parse and validate the MD5 header
void MD5Parser::ParseHeader()
{
	// parse and validate the file version
	SkipSpaces();
	if (!TokenMatch(buffer,"MD5Version",10))	{
		ReportError("Invalid MD5 file: MD5Version tag has not been found");
	}
	SkipSpaces();
	unsigned int iVer = ::strtoul10(buffer,(const char**)&buffer);
	if (10 != iVer)	{
		ReportError("MD5 version tag is unknown (10 is expected)");
	}
	SkipLine();

	// print the command line options to the console
	// FIX: can break the log length limit, so we need to be careful
	char* sz = buffer;
	while (!IsLineEnd( *buffer++));
	DefaultLogger::get()->info(std::string(sz,std::min((uintptr_t)MAX_LOG_MESSAGE_LENGTH, (uintptr_t)(buffer-sz))));
	SkipSpacesAndLineEnd();
}

// ------------------------------------------------------------------------------------------------
// Recursive MD5 parsing function
bool MD5Parser::ParseSection(Section& out)
{
	// store the current line number for use in error messages
	out.iLineNumber = lineNumber;

	// first parse the name of the section
	char* sz = buffer;
	while (!IsSpaceOrNewLine( *buffer))buffer++;
	out.mName = std::string(sz,(uintptr_t)(buffer-sz));
	SkipSpaces();

	bool running = true;
	while (running)	{
		if ('{' == *buffer)	{
			// it is a normal section so read all lines
			buffer++;
			bool run = true;
			while (run)
			{
				if (!SkipSpacesAndLineEnd()) {
					return false; // seems this was the last section
				}
				if ('}' == *buffer)	{
					buffer++;
					break;
				}

				out.mElements.push_back(Element());
				Element& elem = out.mElements.back();

				elem.iLineNumber = lineNumber;
				elem.szStart = buffer;

				// terminate the line with zero 
				while (!IsLineEnd( *buffer))buffer++;
				if (*buffer) {
					++lineNumber;
					*buffer++ = '\0';
				}
			}
			break;
		}
		else if (!IsSpaceOrNewLine(*buffer))	{
			// it is an element at global scope. Parse its value and go on
			sz = buffer;
			while (!IsSpaceOrNewLine( *buffer++));
			out.mGlobalValue = std::string(sz,(uintptr_t)(buffer-sz));
			continue;
		}
		break;
	}
	return SkipSpacesAndLineEnd();
}

// ------------------------------------------------------------------------------------------------
// Some dirty macros just because they're so funny and easy to debug

// skip all spaces ... handle EOL correctly
#define	AI_MD5_SKIP_SPACES()  if(!SkipSpaces(&sz)) \
	MD5Parser::ReportWarning("Unexpected end of line",(*eit).iLineNumber);

	// read a triple float in brackets: (1.0 1.0 1.0)
#define AI_MD5_READ_TRIPLE(vec) \
	AI_MD5_SKIP_SPACES(); \
	if ('(' != *sz++) \
		MD5Parser::ReportWarning("Unexpected token: ( was expected",(*eit).iLineNumber); \
	AI_MD5_SKIP_SPACES(); \
	sz = fast_atoreal_move<float>(sz,(float&)vec.x); \
	AI_MD5_SKIP_SPACES(); \
	sz = fast_atoreal_move<float>(sz,(float&)vec.y); \
	AI_MD5_SKIP_SPACES(); \
	sz = fast_atoreal_move<float>(sz,(float&)vec.z); \
	AI_MD5_SKIP_SPACES(); \
	if (')' != *sz++) \
		MD5Parser::ReportWarning("Unexpected token: ) was expected",(*eit).iLineNumber);

	// parse a string, enclosed in quotation marks or not
#define AI_MD5_PARSE_STRING(out) \
	bool bQuota = (*sz == '\"'); \
	const char* szStart = sz; \
	while (!IsSpaceOrNewLine(*sz))++sz; \
	const char* szEnd = sz; \
	if (bQuota) { \
		szStart++; \
		if ('\"' != *(szEnd-=1)) { \
			MD5Parser::ReportWarning("Expected closing quotation marks in string", \
				(*eit).iLineNumber); \
			continue; \
		} \
	} \
	out.length = (size_t)(szEnd - szStart); \
	::memcpy(out.data,szStart,out.length); \
	out.data[out.length] = '\0';

// ------------------------------------------------------------------------------------------------
// .MD5MESH parsing function
MD5MeshParser::MD5MeshParser(SectionList& mSections)
{
	DefaultLogger::get()->debug("MD5MeshParser begin");

	// now parse all sections
	for (SectionList::const_iterator iter =  mSections.begin(), iterEnd = mSections.end();iter != iterEnd;++iter){
		if ( (*iter).mName == "numMeshes")	{
			mMeshes.reserve(::strtoul10((*iter).mGlobalValue.c_str()));
		}
		else if ( (*iter).mName == "numJoints")	{
			mJoints.reserve(::strtoul10((*iter).mGlobalValue.c_str()));
		}
		else if ((*iter).mName == "joints")	{
			// "origin"	-1 ( -0.000000 0.016430 -0.006044 ) ( 0.707107 0.000000 0.707107 )
			for (ElementList::const_iterator eit = (*iter).mElements.begin(), eitEnd = (*iter).mElements.end();eit != eitEnd; ++eit){
				mJoints.push_back(BoneDesc());
				BoneDesc& desc = mJoints.back();

				const char* sz = (*eit).szStart;
				AI_MD5_PARSE_STRING(desc.mName);
				AI_MD5_SKIP_SPACES();

				// negative values, at least -1, is allowed here
				desc.mParentIndex = (int)strtol10(sz,&sz);
		
				AI_MD5_READ_TRIPLE(desc.mPositionXYZ);
				AI_MD5_READ_TRIPLE(desc.mRotationQuat); // normalized quaternion, so w is not there
			}
		}
		else if ((*iter).mName == "mesh")	{
			mMeshes.push_back(MeshDesc());
			MeshDesc& desc = mMeshes.back();

			for (ElementList::const_iterator eit = (*iter).mElements.begin(), eitEnd = (*iter).mElements.end();eit != eitEnd; ++eit){
				const char* sz = (*eit).szStart;

				// shader attribute
				if (TokenMatch(sz,"shader",6))	{
					AI_MD5_SKIP_SPACES();
					AI_MD5_PARSE_STRING(desc.mShader);
				}
				// numverts attribute
				else if (TokenMatch(sz,"numverts",8))	{
					AI_MD5_SKIP_SPACES();
					desc.mVertices.resize(strtoul10(sz));
				}
				// numtris attribute
				else if (TokenMatch(sz,"numtris",7))	{
					AI_MD5_SKIP_SPACES();
					desc.mFaces.resize(strtoul10(sz));
				}
				// numweights attribute
				else if (TokenMatch(sz,"numweights",10))	{
					AI_MD5_SKIP_SPACES();
					desc.mWeights.resize(strtoul10(sz));
				}
				// vert attribute
				// "vert 0 ( 0.394531 0.513672 ) 0 1"
				else if (TokenMatch(sz,"vert",4))	{
					AI_MD5_SKIP_SPACES();
					const unsigned int idx = ::strtoul10(sz,&sz);
					AI_MD5_SKIP_SPACES();
					if (idx >= desc.mVertices.size())
						desc.mVertices.resize(idx+1);

					VertexDesc& vert = desc.mVertices[idx];	
					if ('(' != *sz++)
						MD5Parser::ReportWarning("Unexpected token: ( was expected",(*eit).iLineNumber);
					AI_MD5_SKIP_SPACES();
					sz = fast_atoreal_move<float>(sz,(float&)vert.mUV.x);
					AI_MD5_SKIP_SPACES();
					sz = fast_atoreal_move<float>(sz,(float&)vert.mUV.y);
					AI_MD5_SKIP_SPACES();
					if (')' != *sz++)
						MD5Parser::ReportWarning("Unexpected token: ) was expected",(*eit).iLineNumber);
					AI_MD5_SKIP_SPACES();
					vert.mFirstWeight = ::strtoul10(sz,&sz);
					AI_MD5_SKIP_SPACES();
					vert.mNumWeights = ::strtoul10(sz,&sz);
				}
				// tri attribute
				// "tri 0 15 13 12"
				else if (TokenMatch(sz,"tri",3)) {
					AI_MD5_SKIP_SPACES();
					const unsigned int idx = strtoul10(sz,&sz);
					if (idx >= desc.mFaces.size())
						desc.mFaces.resize(idx+1);

					aiFace& face = desc.mFaces[idx];	
					face.mIndices = new unsigned int[face.mNumIndices = 3];
					for (unsigned int i = 0; i < 3;++i)	{
						AI_MD5_SKIP_SPACES();
						face.mIndices[i] = strtoul10(sz,&sz);
					}
				}
				// weight attribute
				// "weight 362 5 0.500000 ( -3.553583 11.893474 9.719339 )"
				else if (TokenMatch(sz,"weight",6))	{
					AI_MD5_SKIP_SPACES();
					const unsigned int idx = strtoul10(sz,&sz);
					AI_MD5_SKIP_SPACES();
					if (idx >= desc.mWeights.size())
						desc.mWeights.resize(idx+1);

					WeightDesc& weight = desc.mWeights[idx];	
					weight.mBone = strtoul10(sz,&sz);
					AI_MD5_SKIP_SPACES();
					sz = fast_atoreal_move<float>(sz,weight.mWeight);
					AI_MD5_READ_TRIPLE(weight.vOffsetPosition);
				}
			}
		}
	}
	DefaultLogger::get()->debug("MD5MeshParser end");
}

// ------------------------------------------------------------------------------------------------
// .MD5ANIM parsing function
MD5AnimParser::MD5AnimParser(SectionList& mSections)
{
	DefaultLogger::get()->debug("MD5AnimParser begin");

	fFrameRate = 24.0f;
	mNumAnimatedComponents = UINT_MAX;
	for (SectionList::const_iterator iter =  mSections.begin(), iterEnd = mSections.end();iter != iterEnd;++iter) {
		if ((*iter).mName == "hierarchy")	{
			// "sheath"	0 63 6 
			for (ElementList::const_iterator eit = (*iter).mElements.begin(), eitEnd = (*iter).mElements.end();eit != eitEnd; ++eit) {
				mAnimatedBones.push_back ( AnimBoneDesc () );
				AnimBoneDesc& desc = mAnimatedBones.back();

				const char* sz = (*eit).szStart;
				AI_MD5_PARSE_STRING(desc.mName);
				AI_MD5_SKIP_SPACES();

				// parent index - negative values are allowed (at least -1)
				desc.mParentIndex = ::strtol10(sz,&sz);

				// flags (highest is 2^6-1)
				AI_MD5_SKIP_SPACES();
				if(63 < (desc.iFlags = ::strtoul10(sz,&sz))){
					MD5Parser::ReportWarning("Invalid flag combination in hierarchy section",(*eit).iLineNumber);
				}
				AI_MD5_SKIP_SPACES();

				// index of the first animation keyframe component for this joint
				desc.iFirstKeyIndex = ::strtoul10(sz,&sz);
			}
		}
		else if((*iter).mName == "baseframe")	{
			// ( -0.000000 0.016430 -0.006044 ) ( 0.707107 0.000242 0.707107 )
			for (ElementList::const_iterator eit = (*iter).mElements.begin(), eitEnd = (*iter).mElements.end(); eit != eitEnd; ++eit) {
				const char* sz = (*eit).szStart;

				mBaseFrames.push_back ( BaseFrameDesc () );
				BaseFrameDesc& desc = mBaseFrames.back();

				AI_MD5_READ_TRIPLE(desc.vPositionXYZ);
				AI_MD5_READ_TRIPLE(desc.vRotationQuat);
			}
		}
		else if((*iter).mName ==  "frame")	{
			if (!(*iter).mGlobalValue.length())	{
				MD5Parser::ReportWarning("A frame section must have a frame index",(*iter).iLineNumber);
				continue;
			}

			mFrames.push_back ( FrameDesc () );
			FrameDesc& desc = mFrames.back();
			desc.iIndex = strtoul10((*iter).mGlobalValue.c_str());

			// we do already know how much storage we will presumably need
			if (UINT_MAX != mNumAnimatedComponents) {
				desc.mValues.reserve(mNumAnimatedComponents);
			}

			// now read all elements (continous list of floats)
			for (ElementList::const_iterator eit = (*iter).mElements.begin(), eitEnd = (*iter).mElements.end(); eit != eitEnd; ++eit){
				const char* sz = (*eit).szStart;
				while (SkipSpacesAndLineEnd(&sz))	{
					float f;sz = fast_atoreal_move<float>(sz,f);
					desc.mValues.push_back(f);
				}
			}
		}
		else if((*iter).mName == "numFrames")	{
			mFrames.reserve(strtoul10((*iter).mGlobalValue.c_str()));
		}
		else if((*iter).mName == "numJoints")	{
			const unsigned int num = strtoul10((*iter).mGlobalValue.c_str());
			mAnimatedBones.reserve(num);

			// try to guess the number of animated components if that element is not given
			if (UINT_MAX  == mNumAnimatedComponents) {
				mNumAnimatedComponents = num * 6;
			}
		}
		else if((*iter).mName == "numAnimatedComponents")	{
			mAnimatedBones.reserve( strtoul10((*iter).mGlobalValue.c_str()));
		}
		else if((*iter).mName == "frameRate")	{
			fast_atoreal_move<float>((*iter).mGlobalValue.c_str(),fFrameRate);
		}
	}
	DefaultLogger::get()->debug("MD5AnimParser end");
}

// ------------------------------------------------------------------------------------------------
// .MD5CAMERA parsing function
MD5CameraParser::MD5CameraParser(SectionList& mSections)
{
	DefaultLogger::get()->debug("MD5CameraParser begin");
	fFrameRate = 24.0f;

	for (SectionList::const_iterator iter =  mSections.begin(), iterEnd = mSections.end();iter != iterEnd;++iter) {
		if ((*iter).mName == "numFrames")	{
			frames.reserve(strtoul10((*iter).mGlobalValue.c_str()));
		}
		else if ((*iter).mName == "frameRate")	{
			fFrameRate = fast_atof ((*iter).mGlobalValue.c_str());
		}
		else if ((*iter).mName == "numCuts")	{
			cuts.reserve(strtoul10((*iter).mGlobalValue.c_str()));
		}
		else if ((*iter).mName == "cuts")	{
			for (ElementList::const_iterator eit = (*iter).mElements.begin(), eitEnd = (*iter).mElements.end(); eit != eitEnd; ++eit){
				cuts.push_back(strtoul10((*eit).szStart)+1);
			}
		}
		else if ((*iter).mName == "camera")	{
			for (ElementList::const_iterator eit = (*iter).mElements.begin(), eitEnd = (*iter).mElements.end(); eit != eitEnd; ++eit){
				const char* sz = (*eit).szStart;

				frames.push_back(CameraAnimFrameDesc());
				CameraAnimFrameDesc& cur = frames.back();
				AI_MD5_READ_TRIPLE(cur.vPositionXYZ);
				AI_MD5_READ_TRIPLE(cur.vRotationQuat);
				AI_MD5_SKIP_SPACES();
				cur.fFOV = fast_atof(sz);
			}
		}
	}
	DefaultLogger::get()->debug("MD5CameraParser end");
}

