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

using namespace Assimp;
using namespace Assimp::MD5;

// ------------------------------------------------------------------------------------------------
// Parse the segment structure for an MD5 file
MD5Parser::MD5Parser(char *_buffer, unsigned int _fileSize) : buffer(_buffer), bufferEnd(nullptr), fileSize(_fileSize), lineNumber(0) {
    ai_assert(nullptr != _buffer);
    ai_assert(0 != _fileSize);

    bufferEnd = buffer + fileSize;
    ASSIMP_LOG_DEBUG("MD5Parser begin");

    // parse the file header
    ParseHeader();

    // and read all sections until we're finished
    bool running = true;
    while (running) {
        mSections.emplace_back();
        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
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
void MD5Parser::ReportWarning(const char *warn, unsigned int line) {
    char szBuffer[1024];
    ::snprintf(szBuffer, sizeof(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();
    if (buffer == bufferEnd) {
        return;
    }

    // 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;
        if (buffer == bufferEnd) {
            return false;
	    }
    }
    out.mName = std::string(sz, (uintptr_t)(buffer - sz));
    while (IsSpace(*buffer)) {
        ++buffer;
        if (buffer == bufferEnd) {
            return false;
	    }
    }

    bool running = true;
    while (running) {
        if ('{' == *buffer) {
            // it is a normal section so read all lines
            ++buffer;
            if (buffer == bufferEnd) {
                return false;
	        }
            bool run = true;
            while (run) {
                while (IsSpaceOrNewLine(*buffer)) {
                    ++buffer;
                    if (buffer == bufferEnd) {
                        return false;
		            }
                }
                if ('\0' == *buffer) {
                    return false; // seems this was the last section
                }
                if ('}' == *buffer) {
                    ++buffer;
                    break;
                }

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

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

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

// skip all spaces ... handle EOL correctly
inline void AI_MD5_SKIP_SPACES(const char **sz, const char *bufferEnd, int linenumber) {
    if (!SkipSpaces(sz, bufferEnd)) {
        MD5Parser::ReportWarning("Unexpected end of line", linenumber);
    }
}

// read a triple float in brackets: (1.0 1.0 1.0)
inline void AI_MD5_READ_TRIPLE(aiVector3D &vec, const char **sz, const char *bufferEnd, int linenumber) {
    AI_MD5_SKIP_SPACES(sz, bufferEnd, linenumber);
    if ('(' != **sz) {
        MD5Parser::ReportWarning("Unexpected token: ( was expected", linenumber);
        if (*sz == bufferEnd)
            return;
        ++*sz;
    }
    if (*sz == bufferEnd)
        return;
    ++*sz;
    AI_MD5_SKIP_SPACES(sz, bufferEnd, linenumber);
    *sz = fast_atoreal_move<float>(*sz, (float &)vec.x);
    AI_MD5_SKIP_SPACES(sz, bufferEnd, linenumber);
    *sz = fast_atoreal_move<float>(*sz, (float &)vec.y);
    AI_MD5_SKIP_SPACES(sz, bufferEnd, linenumber);
    *sz = fast_atoreal_move<float>(*sz, (float &)vec.z);
    AI_MD5_SKIP_SPACES(sz, bufferEnd, linenumber);
    if (')' != **sz) {
        MD5Parser::ReportWarning("Unexpected token: ) was expected", linenumber);
    }
    if (*sz == bufferEnd)
        return;
    ++*sz;
}

// parse a string, enclosed in quotation marks or not
inline bool AI_MD5_PARSE_STRING(const char **sz, const char *bufferEnd, aiString &out, int linenumber) {
    bool bQuota = (**sz == '\"');
    const char *szStart = *sz;
    while (!IsSpaceOrNewLine(**sz)) {
        ++*sz;
        if (*sz == bufferEnd) break;
    }
    const char *szEnd = *sz;
    if (bQuota) {
        szStart++;
        if ('\"' != *(szEnd -= 1)) {
            MD5Parser::ReportWarning("Expected closing quotation marks in string", linenumber);
            ++*sz;
        }
    }
    out.length = (ai_uint32)(szEnd - szStart);
    ::memcpy(out.data, szStart, out.length);
    out.data[out.length] = '\0';

    return true;
}

// parse a string, enclosed in quotation marks
inline void AI_MD5_PARSE_STRING_IN_QUOTATION(const char **sz, const char *bufferEnd, aiString &out) {
    out.length = 0u;
    while (('\"' != **sz && '\0' != **sz) && *sz != bufferEnd) {
        ++*sz;
    }
    if ('\0' != **sz) {
        const char *szStart = ++(*sz);
        
        while (('\"' != **sz && '\0' != **sz) && *sz != bufferEnd) {
            ++*sz;
        }
        if ('\0' != **sz) {
            const char *szEnd = *sz;
            ++*sz;
            out.length = (ai_uint32)(szEnd - szStart);
            ::memcpy(out.data, szStart, out.length);
        }
    }
    out.data[out.length] = '\0';
}

// ------------------------------------------------------------------------------------------------
// .MD5MESH parsing function
MD5MeshParser::MD5MeshParser(SectionArray &mSections) {
    ASSIMP_LOG_DEBUG("MD5MeshParser begin");

    // now parse all sections
    for (SectionArray::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.emplace_back();
                BoneDesc &desc = mJoints.back();

                const char *sz = elem.szStart;
                AI_MD5_PARSE_STRING_IN_QUOTATION(&sz, elem.end, desc.mName);
                
                AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);

                // negative values, at least -1, is allowed here
                desc.mParentIndex = (int)strtol10(sz, &sz);

                AI_MD5_READ_TRIPLE(desc.mPositionXYZ, &sz, elem.end, elem.iLineNumber);
                AI_MD5_READ_TRIPLE(desc.mRotationQuat, &sz, elem.end, elem.iLineNumber); // normalized quaternion, so w is not there
            }
        } else if ((*iter).mName == "mesh") {
            mMeshes.emplace_back();
            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(&sz, elem.end, elem.iLineNumber);
                    AI_MD5_PARSE_STRING_IN_QUOTATION(&sz, elem.end, desc.mShader);
                }
                // numverts attribute
                else if (TokenMatch(sz, "numverts", 8)) {
                    AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);
                    desc.mVertices.resize(strtoul10(sz));
                }
                // numtris attribute
                else if (TokenMatch(sz, "numtris", 7)) {
                    AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);
                    desc.mFaces.resize(strtoul10(sz));
                }
                // numweights attribute
                else if (TokenMatch(sz, "numweights", 10)) {
                    AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);
                    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(&sz, elem.end, elem.iLineNumber);
                    const unsigned int idx = ::strtoul10(sz, &sz);
                    AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);
                    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, elem.end, elem.iLineNumber);
                    sz = fast_atoreal_move<float>(sz, (float &)vert.mUV.x);
                    AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);
                    sz = fast_atoreal_move<float>(sz, (float &)vert.mUV.y);
                    AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);
                    if (')' != *sz++)
                        MD5Parser::ReportWarning("Unexpected token: ) was expected", elem.iLineNumber);
                    AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);
                    vert.mFirstWeight = ::strtoul10(sz, &sz);
                    AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);
                    vert.mNumWeights = ::strtoul10(sz, &sz);
                }
                // tri attribute
                // "tri 0 15 13 12"
                else if (TokenMatch(sz, "tri", 3)) {
                    AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);
                    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(&sz, elem.end, elem.iLineNumber);
                        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(&sz, elem.end, elem.iLineNumber);
                    const unsigned int idx = strtoul10(sz, &sz);
                    AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);
                    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, elem.end, elem.iLineNumber);
                    sz = fast_atoreal_move<float>(sz, weight.mWeight);
                    AI_MD5_READ_TRIPLE(weight.vOffsetPosition, &sz, elem.end, elem.iLineNumber);
                }
            }
        }
    }
    ASSIMP_LOG_DEBUG("MD5MeshParser end");
}

// ------------------------------------------------------------------------------------------------
// .MD5ANIM parsing function
MD5AnimParser::MD5AnimParser(SectionArray &mSections) {
    ASSIMP_LOG_DEBUG("MD5AnimParser begin");

    fFrameRate = 24.0f;
    mNumAnimatedComponents = UINT_MAX;
    for (SectionArray::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.emplace_back();
                AnimBoneDesc &desc = mAnimatedBones.back();

                const char *sz = elem.szStart;
                AI_MD5_PARSE_STRING_IN_QUOTATION(&sz, elem.end, desc.mName);
                AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);

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

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

                // 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.emplace_back();
                BaseFrameDesc &desc = mBaseFrames.back();

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

            mFrames.emplace_back();
            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, elem.end)) {
                    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(SectionArray &mSections) {
    ASSIMP_LOG_DEBUG("MD5CameraParser begin");
    fFrameRate = 24.0f;

    for (SectionArray::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.emplace_back();
                CameraAnimFrameDesc &cur = frames.back();
                AI_MD5_READ_TRIPLE(cur.vPositionXYZ, &sz, elem.end, elem.iLineNumber);
                AI_MD5_READ_TRIPLE(cur.vRotationQuat, &sz, elem.end, elem.iLineNumber);
                AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);
                cur.fFOV = fast_atof(sz);
            }
        }
    }
    ASSIMP_LOG_DEBUG("MD5CameraParser end");
}
