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/** @file  RawLoader.cpp

 *  @brief Implementation of the RAW importer class

 */

#ifndef ASSIMP_BUILD_NO_RAW_IMPORTER

// internal headers

#include "RawLoader.h"

#include <assimp/ParsingUtils.h>

#include <assimp/fast_atof.h>

#include <assimp/importerdesc.h>

#include <assimp/scene.h>

#include <assimp/DefaultLogger.hpp>

#include <assimp/IOSystem.hpp>

#include <memory>

namespace Assimp {

static constexpr aiImporterDesc desc = {

    "Raw Importer",

    "",

    "",

    "",

    aiImporterFlags_SupportTextFlavour,

    0,

    0,

    0,

    0,

    "raw"

};

// ------------------------------------------------------------------------------------------------

// Returns whether the class can handle the format of the given file.

bool RAWImporter::CanRead(const std::string &filename, IOSystem * /*pIOHandler*/, bool /*checkSig*/) const {

    return SimpleExtensionCheck(filename, "raw");

}

// ------------------------------------------------------------------------------------------------

const aiImporterDesc *RAWImporter::GetInfo() const {

    return &desc;

}

// ------------------------------------------------------------------------------------------------

// Imports the given file into the given scene structure.

void RAWImporter::InternReadFile(const std::string &pFile,

        aiScene *pScene, IOSystem *pIOHandler) {

    std::unique_ptr<IOStream> file(pIOHandler->Open(pFile, "rb"));

    // Check whether we can read from the file

    if (file == nullptr) {

        throw DeadlyImportError("Failed to open RAW file ", pFile, ".");

    }

    // allocate storage and copy the contents of the file to a memory buffer

    // (terminate it with zero)

    std::vector<char> mBuffer2;

    TextFileToBuffer(file.get(), mBuffer2);

    const char *buffer = &mBuffer2[0];

    // list of groups loaded from the file

    std::vector<GroupInformation> outGroups(1, GroupInformation("<default>"));

    std::vector<GroupInformation>::iterator curGroup = outGroups.begin();

    // now read all lines

    char line[4096];

    const char *end = &line[4096];

    while (GetNextLine(buffer, line)) {

        // if the line starts with a non-numeric identifier, it marks

        // the beginning of a new group

        const char *sz = line;

        SkipSpaces(&sz, end);

        if (IsLineEnd(*sz)) continue;

        if (!IsNumeric(*sz)) {

            const char *sz2 = sz;

            while (!IsSpaceOrNewLine(*sz2))

                ++sz2;

            const unsigned int length = (unsigned int)(sz2 - sz);

            // find an existing group with this name

            for (std::vector<GroupInformation>::iterator it = outGroups.begin(), endIt = outGroups.end();

                    it != endIt; ++it) {

                if (length == (*it).name.length() && !::strcmp(sz, (*it).name.c_str())) {

                    curGroup = it;

                    sz2 = nullptr;

                    break;

                }

            }

            if (sz2) {

                outGroups.emplace_back(std::string(sz, length));

                curGroup = outGroups.end() - 1;

            }

        } else {

            // there can be maximally 12 floats plus an extra texture file name

            float data[12];

            unsigned int num;

            for (num = 0; num < 12; ++num) {

                if (!SkipSpaces(&sz, end) || !IsNumeric(*sz)) break;

                sz = fast_atoreal_move<float>(sz, data[num]);

            }

            if (num != 12 && num != 9) {

                ASSIMP_LOG_ERROR("A line may have either 9 or 12 floats and an optional texture");

                continue;

            }

            MeshInformation *output = nullptr;

            const char *sz2 = sz;

            unsigned int length;

            if (!IsLineEnd(*sz)) {

                while (!IsSpaceOrNewLine(*sz2))

                    ++sz2;

                length = (unsigned int)(sz2 - sz);

            } else if (9 == num) {

                sz = "%default%";

                length = 9;

            } else {

                sz = "";

                length = 0;

            }

            // search in the list of meshes whether we have one with this texture

            for (auto &mesh : (*curGroup).meshes) {

                if (length == mesh.name.length() && (length ? !::strcmp(sz, mesh.name.c_str()) : true)) {

                    output = &mesh;

                    break;

                }

            }

            // if we don't have the mesh, create it

            if (!output) {

                (*curGroup).meshes.emplace_back(std::string(sz, length));

                output = &((*curGroup).meshes.back());

            }

            if (12 == num) {

                aiColor4D v(data[0], data[1], data[2], 1.0f);

                output->colors.push_back(v);

                output->colors.push_back(v);

                output->colors.push_back(v);

                output->vertices.emplace_back(data[3], data[4], data[5]);

                output->vertices.emplace_back(data[6], data[7], data[8]);

                output->vertices.emplace_back(data[9], data[10], data[11]);

            } else {

                output->vertices.emplace_back(data[0], data[1], data[2]);

                output->vertices.emplace_back(data[3], data[4], data[5]);

                output->vertices.emplace_back(data[6], data[7], data[8]);

            }

        }

    }

    pScene->mRootNode = new aiNode();

    pScene->mRootNode->mName.Set("<RawRoot>");

    // count the number of valid groups

    // (meshes can't be empty)

    for (auto &outGroup : outGroups) {

        if (!outGroup.meshes.empty()) {

            ++pScene->mRootNode->mNumChildren;

            pScene->mNumMeshes += (unsigned int)outGroup.meshes.size();

        }

    }

    if (!pScene->mNumMeshes) {

        throw DeadlyImportError("RAW: No meshes loaded. The file seems to be corrupt or empty.");

    }

    pScene->mMeshes = new aiMesh *[pScene->mNumMeshes];

    aiNode **cc;

    if (1 == pScene->mRootNode->mNumChildren) {

        cc = &pScene->mRootNode;

        pScene->mRootNode->mNumChildren = 0;

    } else {

        cc = new aiNode *[pScene->mRootNode->mNumChildren];

        memset(cc, 0, sizeof(aiNode *) * pScene->mRootNode->mNumChildren);

        pScene->mRootNode->mChildren = cc;

    }

    pScene->mNumMaterials = pScene->mNumMeshes;

    aiMaterial **mats = pScene->mMaterials = new aiMaterial *[pScene->mNumMaterials];

    unsigned int meshIdx = 0;

    for (auto &outGroup : outGroups) {

        if (outGroup.meshes.empty()) continue;

        aiNode *node;

        if (pScene->mRootNode->mNumChildren) {

            node = *cc = new aiNode();

            node->mParent = pScene->mRootNode;

        } else

            node = *cc;

        node->mName.Set(outGroup.name);

        // add all meshes

        node->mNumMeshes = (unsigned int)outGroup.meshes.size();

        unsigned int *pi = node->mMeshes = new unsigned int[node->mNumMeshes];

        for (std::vector<MeshInformation>::iterator it2 = outGroup.meshes.begin(),

                                                    end2 = outGroup.meshes.end();

                it2 != end2; ++it2) {

            ai_assert(!(*it2).vertices.empty());

            // allocate the mesh

            *pi++ = meshIdx;

            aiMesh *mesh = pScene->mMeshes[meshIdx] = new aiMesh();

            mesh->mMaterialIndex = meshIdx++;

            mesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

            // allocate storage for the vertex components and copy them

            mesh->mNumVertices = (unsigned int)(*it2).vertices.size();

            mesh->mVertices = new aiVector3D[mesh->mNumVertices];

            ::memcpy(mesh->mVertices, &(*it2).vertices[0], sizeof(aiVector3D) * mesh->mNumVertices);

            if ((*it2).colors.size()) {

                ai_assert((*it2).colors.size() == mesh->mNumVertices);

                mesh->mColors[0] = new aiColor4D[mesh->mNumVertices];

                ::memcpy(mesh->mColors[0], &(*it2).colors[0], sizeof(aiColor4D) * mesh->mNumVertices);

            }

            // generate triangles

            ai_assert(0 == mesh->mNumVertices % 3);

            aiFace *fc = mesh->mFaces = new aiFace[mesh->mNumFaces = mesh->mNumVertices / 3];

            aiFace *const fcEnd = fc + mesh->mNumFaces;

            unsigned int n = 0;

            while (fc != fcEnd) {

                aiFace &f = *fc++;

                f.mIndices = new unsigned int[f.mNumIndices = 3];

                for (unsigned int m = 0; m < 3; ++m)

                    f.mIndices[m] = n++;

            }

            // generate a material for the mesh

            aiMaterial *mat = new aiMaterial();

            aiColor4D clr(1.0f, 1.0f, 1.0f, 1.0f);

            if ("%default%" == (*it2).name) // a gray default material

            {

                clr.r = clr.g = clr.b = 0.6f;

            } else if ((*it2).name.length() > 0) // a texture

            {

                aiString s;

                s.Set((*it2).name);

                mat->AddProperty(&s, AI_MATKEY_TEXTURE_DIFFUSE(0));

            }

            mat->AddProperty<aiColor4D>(&clr, 1, AI_MATKEY_COLOR_DIFFUSE);

            *mats++ = mat;

        }

    }

}

} // namespace Assimp

#endif // !! ASSIMP_BUILD_NO_RAW_IMPORTER