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/** @file Implementation of the post processing step "MakeVerboseFormat"

*/

#include "MakeVerboseFormat.h"

#include <assimp/scene.h>

#include <assimp/DefaultLogger.hpp>

using namespace Assimp;

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

// Executes the post processing step on the given imported data.

void MakeVerboseFormatProcess::Execute(aiScene *pScene) {

    ai_assert(nullptr != pScene);

    ASSIMP_LOG_DEBUG("MakeVerboseFormatProcess begin");

    bool bHas = false;

    for (unsigned int a = 0; a < pScene->mNumMeshes; a++) {

        if (MakeVerboseFormat(pScene->mMeshes[a]))

            bHas = true;

    }

    if (bHas) {

        ASSIMP_LOG_INFO("MakeVerboseFormatProcess finished. There was much work to do ...");

    } else {

        ASSIMP_LOG_DEBUG("MakeVerboseFormatProcess. There was nothing to do.");

    }

    pScene->mFlags &= ~AI_SCENE_FLAGS_NON_VERBOSE_FORMAT;

}

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

// Executes the post processing step on the given imported data.

bool MakeVerboseFormatProcess::MakeVerboseFormat(aiMesh *pcMesh) {

    ai_assert(nullptr != pcMesh);

    unsigned int iOldNumVertices = pcMesh->mNumVertices;

    const unsigned int iNumVerts = pcMesh->mNumFaces * 3;

    aiVector3D *pvPositions = new aiVector3D[iNumVerts];

    aiVector3D *pvNormals = nullptr;

    if (pcMesh->HasNormals()) {

        pvNormals = new aiVector3D[iNumVerts];

    }

    aiVector3D *pvTangents = nullptr, *pvBitangents = nullptr;

    if (pcMesh->HasTangentsAndBitangents()) {

        pvTangents = new aiVector3D[iNumVerts];

        pvBitangents = new aiVector3D[iNumVerts];

    }

    aiVector3D *apvTextureCoords[AI_MAX_NUMBER_OF_TEXTURECOORDS] = { nullptr };

    aiColor4D *apvColorSets[AI_MAX_NUMBER_OF_COLOR_SETS] = { nullptr };

    unsigned int p = 0;

    while (pcMesh->HasTextureCoords(p))

        apvTextureCoords[p++] = new aiVector3D[iNumVerts];

    p = 0;

    while (pcMesh->HasVertexColors(p))

        apvColorSets[p++] = new aiColor4D[iNumVerts];

    // allocate enough memory to hold output bones and vertex weights ...

    std::vector<aiVertexWeight> *newWeights = new std::vector<aiVertexWeight>[pcMesh->mNumBones];

    for (unsigned int i = 0; i < pcMesh->mNumBones; ++i) {

        newWeights[i].reserve(pcMesh->mBones[i]->mNumWeights * 3);

    }

    // iterate through all faces and build a clean list

    unsigned int iIndex = 0;

    for (unsigned int a = 0; a < pcMesh->mNumFaces; ++a) {

        aiFace *pcFace = &pcMesh->mFaces[a];

        for (unsigned int q = 0; q < pcFace->mNumIndices; ++q, ++iIndex) {

            // need to build a clean list of bones, too

            for (unsigned int i = 0; i < pcMesh->mNumBones; ++i) {

                for (unsigned int boneIdx = 0; boneIdx < pcMesh->mBones[i]->mNumWeights; ++boneIdx) {

                    const aiVertexWeight &w = pcMesh->mBones[i]->mWeights[boneIdx];

                    if (pcFace->mIndices[q] == w.mVertexId) {

                        aiVertexWeight wNew;

                        wNew.mVertexId = iIndex;

                        wNew.mWeight = w.mWeight;

                        newWeights[i].push_back(wNew);

                    }

                }

            }

            pvPositions[iIndex] = pcMesh->mVertices[pcFace->mIndices[q]];

            if (pcMesh->HasNormals()) {

                pvNormals[iIndex] = pcMesh->mNormals[pcFace->mIndices[q]];

            }

            if (pcMesh->HasTangentsAndBitangents()) {

                pvTangents[iIndex] = pcMesh->mTangents[pcFace->mIndices[q]];

                pvBitangents[iIndex] = pcMesh->mBitangents[pcFace->mIndices[q]];

            }

            unsigned int pp = 0;

            while (pcMesh->HasTextureCoords(pp)) {

                apvTextureCoords[pp][iIndex] = pcMesh->mTextureCoords[pp][pcFace->mIndices[q]];

                ++pp;

            }

            pp = 0;

            while (pcMesh->HasVertexColors(pp)) {

                apvColorSets[pp][iIndex] = pcMesh->mColors[pp][pcFace->mIndices[q]];

                ++pp;

            }

            pcFace->mIndices[q] = iIndex;

        }

    }

    // build output vertex weights

    for (unsigned int i = 0; i < pcMesh->mNumBones; ++i) {

        delete[] pcMesh->mBones[i]->mWeights;

        if (!newWeights[i].empty()) {

            pcMesh->mBones[i]->mWeights = new aiVertexWeight[newWeights[i].size()];

            pcMesh->mBones[i]->mNumWeights = static_cast<unsigned int>(newWeights[i].size());

            aiVertexWeight *weightToCopy = &(newWeights[i][0]);

            memcpy(pcMesh->mBones[i]->mWeights, weightToCopy,

                    sizeof(aiVertexWeight) * newWeights[i].size());

        } else {

            pcMesh->mBones[i]->mWeights = nullptr;

        }

    }

    delete[] newWeights;

    // delete the old members

    delete[] pcMesh->mVertices;

    pcMesh->mVertices = pvPositions;

    p = 0;

    while (pcMesh->HasTextureCoords(p)) {

        delete[] pcMesh->mTextureCoords[p];

        pcMesh->mTextureCoords[p] = apvTextureCoords[p];

        ++p;

    }

    p = 0;

    while (pcMesh->HasVertexColors(p)) {

        delete[] pcMesh->mColors[p];

        pcMesh->mColors[p] = apvColorSets[p];

        ++p;

    }

    pcMesh->mNumVertices = iNumVerts;

    if (pcMesh->HasNormals()) {

        delete[] pcMesh->mNormals;

        pcMesh->mNormals = pvNormals;

    }

    if (pcMesh->HasTangentsAndBitangents()) {

        delete[] pcMesh->mTangents;

        pcMesh->mTangents = pvTangents;

        delete[] pcMesh->mBitangents;

        pcMesh->mBitangents = pvBitangents;

    }

    return (pcMesh->mNumVertices != iOldNumVertices);

}

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

bool IsMeshInVerboseFormat(const aiMesh *mesh) {

    // avoid slow vector<bool> specialization

    std::vector<unsigned int> seen(mesh->mNumVertices, 0);

    for (unsigned int i = 0; i < mesh->mNumFaces; ++i) {

        const aiFace &f = mesh->mFaces[i];

        for (unsigned int j = 0; j < f.mNumIndices; ++j) {

            if (++seen[f.mIndices[j]] == 2) {

                // found a duplicate index

                return false;

            }

        }

    }

    return true;

}

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

bool MakeVerboseFormatProcess::IsVerboseFormat(const aiScene *pScene) {

    for (unsigned int i = 0; i < pScene->mNumMeshes; ++i) {

        if (!IsMeshInVerboseFormat(pScene->mMeshes[i])) {

            return false;

        }

    }

    return true;

}