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/** @file Implementation of the post processing step to remove

 *        any parts of the mesh structure from the imported data.

*/

#include "RemoveVCProcess.h"

#include <assimp/postprocess.h>

#include <assimp/scene.h>

#include <assimp/DefaultLogger.hpp>

using namespace Assimp;

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

// Constructor to be privately used by Importer

RemoveVCProcess::RemoveVCProcess() :

        configDeleteFlags(), mScene() {}

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

// Returns whether the processing step is present in the given flag field.

bool RemoveVCProcess::IsActive(unsigned int pFlags) const {

    return (pFlags & aiProcess_RemoveComponent) != 0;

}

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

// Small helper function to delete all elements in a T** array using delete

template <typename T>

inline void ArrayDelete(T **&in, unsigned int &num) {

    for (unsigned int i = 0; i < num; ++i)

        delete in[i];

    delete[] in;

    in = nullptr;

    num = 0;

}

Unexecuted instantiation: void ArrayDelete<aiAnimation>(aiAnimation**&, unsigned int&)

Unexecuted instantiation: void ArrayDelete<aiTexture>(aiTexture**&, unsigned int&)

Unexecuted instantiation: void ArrayDelete<aiLight>(aiLight**&, unsigned int&)

Unexecuted instantiation: void ArrayDelete<aiCamera>(aiCamera**&, unsigned int&)

Unexecuted instantiation: void ArrayDelete<aiMesh>(aiMesh**&, unsigned int&)

Unexecuted instantiation: void ArrayDelete<aiBone>(aiBone**&, unsigned int&)

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

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

void RemoveVCProcess::Execute(aiScene *pScene) {

    ASSIMP_LOG_DEBUG("RemoveVCProcess begin");

    bool bHas = false; //,bMasked = false;

    mScene = pScene;

    // handle animations

    if (configDeleteFlags & aiComponent_ANIMATIONS) {

        bHas = true;

        ArrayDelete(pScene->mAnimations, pScene->mNumAnimations);

    }

    // handle textures

    if (configDeleteFlags & aiComponent_TEXTURES) {

        bHas = true;

        ArrayDelete(pScene->mTextures, pScene->mNumTextures);

    }

    // handle materials

    if (configDeleteFlags & aiComponent_MATERIALS && pScene->mNumMaterials) {

        bHas = true;

        for (unsigned int i = 1; i < pScene->mNumMaterials; ++i)

            delete pScene->mMaterials[i];

        pScene->mNumMaterials = 1;

        aiMaterial *helper = (aiMaterial *)pScene->mMaterials[0];

        ai_assert(nullptr != helper);

        helper->Clear();

        // gray

        aiColor3D clr(0.6f, 0.6f, 0.6f);

        helper->AddProperty(&clr, 1, AI_MATKEY_COLOR_DIFFUSE);

        // add a small ambient color value

        clr = aiColor3D(0.05f, 0.05f, 0.05f);

        helper->AddProperty(&clr, 1, AI_MATKEY_COLOR_AMBIENT);

        aiString s;

        s.Set("Dummy_MaterialsRemoved");

        helper->AddProperty(&s, AI_MATKEY_NAME);

    }

    // handle light sources

    if (configDeleteFlags & aiComponent_LIGHTS) {

        bHas = true;

        ArrayDelete(pScene->mLights, pScene->mNumLights);

    }

    // handle camneras

    if (configDeleteFlags & aiComponent_CAMERAS) {

        bHas = true;

        ArrayDelete(pScene->mCameras, pScene->mNumCameras);

    }

    // handle meshes

    if (configDeleteFlags & aiComponent_MESHES) {

        bHas = true;

        ArrayDelete(pScene->mMeshes, pScene->mNumMeshes);

    } else {

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

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

                bHas = true;

        }

    }

    // now check whether the result is still a full scene

    if (!pScene->mNumMeshes || !pScene->mNumMaterials) {

        pScene->mFlags |= AI_SCENE_FLAGS_INCOMPLETE;

        ASSIMP_LOG_DEBUG("Setting AI_SCENE_FLAGS_INCOMPLETE flag");

        // If we have no meshes anymore we should also clear another flag ...

        if (!pScene->mNumMeshes)

            pScene->mFlags &= ~AI_SCENE_FLAGS_NON_VERBOSE_FORMAT;

    }

    if (bHas) {

        ASSIMP_LOG_INFO("RemoveVCProcess finished. Data structure cleanup has been done.");

    } else {

        ASSIMP_LOG_DEBUG("RemoveVCProcess finished. Nothing to be done ...");

    }

}

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

// Setup configuration properties for the step

void RemoveVCProcess::SetupProperties(const Importer *pImp) {

    configDeleteFlags = pImp->GetPropertyInteger(AI_CONFIG_PP_RVC_FLAGS, 0x0);

    if (!configDeleteFlags) {

        ASSIMP_LOG_WARN("RemoveVCProcess: AI_CONFIG_PP_RVC_FLAGS is zero.");

    }

}

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

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

bool RemoveVCProcess::ProcessMesh(aiMesh *pMesh) {

    bool ret = false;

    // if all materials have been deleted let the material

    // index of the mesh point to the created default material

    if (configDeleteFlags & aiComponent_MATERIALS)

        pMesh->mMaterialIndex = 0;

    // handle normals

    if (configDeleteFlags & aiComponent_NORMALS && pMesh->mNormals) {

        delete[] pMesh->mNormals;

        pMesh->mNormals = nullptr;

        ret = true;

    }

    // handle tangents and bitangents

    if (configDeleteFlags & aiComponent_TANGENTS_AND_BITANGENTS && pMesh->mTangents) {

        delete[] pMesh->mTangents;

        pMesh->mTangents = nullptr;

        delete[] pMesh->mBitangents;

        pMesh->mBitangents = nullptr;

        ret = true;

    }

    // handle texture coordinates

    bool b = (0 != (configDeleteFlags & aiComponent_TEXCOORDS));

    for (unsigned int i = 0, real = 0; real < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++real) {

        if (!pMesh->mTextureCoords[i]) break;

        if (configDeleteFlags & aiComponent_TEXCOORDSn(real) || b) {

            delete[] pMesh->mTextureCoords[i];

            pMesh->mTextureCoords[i] = nullptr;

            ret = true;

            if (!b) {

                // collapse the rest of the array

                for (unsigned int a = i + 1; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++a)

                    pMesh->mTextureCoords[a - 1] = pMesh->mTextureCoords[a];

                pMesh->mTextureCoords[AI_MAX_NUMBER_OF_TEXTURECOORDS - 1] = nullptr;

                continue;

            }

        }

        ++i;

    }

    // handle vertex colors

    b = (0 != (configDeleteFlags & aiComponent_COLORS));

    for (unsigned int i = 0, real = 0; real < AI_MAX_NUMBER_OF_COLOR_SETS; ++real) {

        if (!pMesh->mColors[i]) break;

        if (configDeleteFlags & aiComponent_COLORSn(i) || b) {

            delete[] pMesh->mColors[i];

            pMesh->mColors[i] = nullptr;

            ret = true;

            if (!b) {

                // collapse the rest of the array

                for (unsigned int a = i + 1; a < AI_MAX_NUMBER_OF_COLOR_SETS; ++a)

                    pMesh->mColors[a - 1] = pMesh->mColors[a];

                pMesh->mColors[AI_MAX_NUMBER_OF_COLOR_SETS - 1] = nullptr;

                continue;

            }

        }

        ++i;

    }

    // handle bones

    if (configDeleteFlags & aiComponent_BONEWEIGHTS && pMesh->mBones) {

        ArrayDelete(pMesh->mBones, pMesh->mNumBones);

        ret = true;

    }

    return ret;

}