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/** @file  MD5Parser.cpp
 *  @brief Implementation of the MD5 parser class
 */


// internal headers
#include "AssetLib/MD5/MD5Loader.h"
#include "Material/MaterialSystem.h"

#include <assimp/fast_atof.h>
#include <assimp/ParsingUtils.h>
#include <assimp/StringComparison.h>
#include <assimp/DefaultLogger.hpp>
#include <assimp/mesh.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;

    ASSIMP_LOG_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
        ::ai_snprintf(szBuffer,128,"MD5Parser end. Parsed %i sections",(int)mSections.size());
        ASSIMP_LOG_DEBUG(szBuffer);
    }
}

// ------------------------------------------------------------------------------------------------
// Report error to the log stream
/*static*/ AI_WONT_RETURN void MD5Parser::ReportError (const char* error, unsigned int line)
{
    char szBuffer[1024];
    ::ai_snprintf(szBuffer, 1024, "[MD5] Line %u: %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 %u: %s",line,warn);
    ASSIMP_LOG_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++));
    ASSIMP_LOG_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",elem.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",elem.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",elem.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", \
                elem.iLineNumber); \
            continue; \
        } \
    } \
    out.length = (size_t)(szEnd - szStart); \
    ::memcpy(out.data,szStart,out.length); \
    out.data[out.length] = '\0';

	// parse a string, enclosed in quotation marks
#define AI_MD5_PARSE_STRING_IN_QUOTATION(out) \
	while('\"'!=*sz)++sz; \
    const char* szStart = ++sz; \
	while('\"'!=*sz)++sz; \
    const char* szEnd = (sz++); \
    out.length = (ai_uint32) (szEnd - szStart); \
    ::memcpy(out.data,szStart,out.length); \
    out.data[out.length] = '\0';
// ------------------------------------------------------------------------------------------------
// .MD5MESH parsing function
MD5MeshParser::MD5MeshParser(SectionList& mSections)
{
    ASSIMP_LOG_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 (const auto & elem : (*iter).mElements){
                mJoints.push_back(BoneDesc());
                BoneDesc& desc = mJoints.back();
				
                const char* sz = elem.szStart;
				AI_MD5_PARSE_STRING_IN_QUOTATION(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 (const auto & elem : (*iter).mElements){
                const char* sz = elem.szStart;

                // shader attribute
                if (TokenMatch(sz,"shader",6))  {
                    AI_MD5_SKIP_SPACES();
                    AI_MD5_PARSE_STRING_IN_QUOTATION(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",elem.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",elem.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);
                }
            }
        }
    }
    ASSIMP_LOG_DEBUG("MD5MeshParser end");
}

// ------------------------------------------------------------------------------------------------
// .MD5ANIM parsing function
MD5AnimParser::MD5AnimParser(SectionList& mSections)
{
    ASSIMP_LOG_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 (const auto & elem : (*iter).mElements) {
                mAnimatedBones.push_back ( AnimBoneDesc () );
                AnimBoneDesc& desc = mAnimatedBones.back();

                const char* sz = elem.szStart;
                AI_MD5_PARSE_STRING_IN_QUOTATION(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",elem.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 (const auto & elem : (*iter).mElements) {
                const char* sz = elem.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 (continuous list of floats)
            for (const auto & elem : (*iter).mElements){
                const char* sz = elem.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);
        }
    }
    ASSIMP_LOG_DEBUG("MD5AnimParser end");
}

// ------------------------------------------------------------------------------------------------
// .MD5CAMERA parsing function
MD5CameraParser::MD5CameraParser(SectionList& mSections)
{
    ASSIMP_LOG_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 (const auto & elem : (*iter).mElements){
                cuts.push_back(strtoul10(elem.szStart)+1);
            }
        }
        else if ((*iter).mName == "camera") {
            for (const auto & elem : (*iter).mElements){
                const char* sz = elem.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);
            }
        }
    }
    ASSIMP_LOG_DEBUG("MD5CameraParser end");
}

