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*/

/** @file  MD5Parser.cpp

 *  @brief Implementation of the MD5 parser class

 */

// internal headers

#include "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();

    // print the command line options to the console

    char *sz = buffer;

    while (buffer < bufferEnd) {

        if (IsLineEnd(*buffer++)) {

            break;

        }

    }

    if (buffer == bufferEnd) {

        return;

    }

    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(*sz, vec.x);

    AI_MD5_SKIP_SPACES(sz, bufferEnd, linenumber);

    *sz = fast_atoreal_move(*sz, vec.y);

    AI_MD5_SKIP_SPACES(sz, bufferEnd, linenumber);

    *sz = fast_atoreal_move(*sz, 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);

    if (out.length >= AI_MAXLEN)

        out.length = AI_MAXLEN - 1;

    ::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);

            if (out.length >= AI_MAXLEN)

                out.length = AI_MAXLEN - 1;

            ::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(sz, vert.mUV.x);

                    AI_MD5_SKIP_SPACES(&sz, elem.end, elem.iLineNumber);

                    sz = fast_atoreal_move(sz, 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];

                    if (face.mNumIndices != 3) {

            delete [] face.mIndices;

            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(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(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((*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");

}