/*

Open Asset Import Library (assimp)

----------------------------------------------------------------------

Copyright (c) 2006-2026, assimp team

All rights reserved.

Redistribution and use of this software in source and binary forms,

with or without modification, are permitted provided that the

following conditions are met:

* Redistributions of source code must retain the above

copyright notice, this list of conditions and the

following disclaimer.

* Redistributions in binary form must reproduce the above

copyright notice, this list of conditions and the

following disclaimer in the documentation and/or other

materials provided with the distribution.

* Neither the name of the assimp team, nor the names of its

contributors may be used to endorse or promote products

derived from this software without specific prior

written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

----------------------------------------------------------------------

*/

#include "EmbedTexturesProcess.h"

#include <assimp/IOStream.hpp>

#include <assimp/IOSystem.hpp>

#include <assimp/ParsingUtils.h>

#include "ProcessHelper.h"

#include <fstream>

#include <algorithm>

using namespace Assimp;

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

    return (pFlags & aiProcess_EmbedTextures) != 0;

}

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

    mRootPath = pImp->GetPropertyString("sourceFilePath");

    mRootPath = mRootPath.substr(0, mRootPath.find_last_of("\\/") + 1u);

    mIOHandler = pImp->GetIOHandler();

}

void EmbedTexturesProcess::Execute(aiScene* pScene) {

    if (pScene == nullptr || pScene->mRootNode == nullptr || mIOHandler == nullptr){

        return;

    }

    aiString path;

    uint32_t embeddedTexturesCount = 0u;

    for (auto matId = 0u; matId < pScene->mNumMaterials; ++matId) {

        auto material = pScene->mMaterials[matId];

        for (auto ttId = 1u; ttId < AI_TEXTURE_TYPE_MAX; ++ttId) {

            auto tt = static_cast<aiTextureType>(ttId);

            auto texturesCount = material->GetTextureCount(tt);

            for (auto texId = 0u; texId < texturesCount; ++texId) {

                material->GetTexture(tt, texId, &path);

                if (path.data[0] == '*') continue; // Already embedded

                // Indeed embed

                if (addTexture(pScene, path.data)) {

                    auto embeddedTextureId = pScene->mNumTextures - 1u;

                    path.length = ::ai_snprintf(path.data, 1024, "*%u", embeddedTextureId);

                    material->AddProperty(&path, AI_MATKEY_TEXTURE(tt, texId));

                    embeddedTexturesCount++;

                }

            }

        }

    }

    ASSIMP_LOG_INFO("EmbedTexturesProcess finished. Embedded ", embeddedTexturesCount, " textures." );

}

std::string EmbedTexturesProcess::tryToFindValidPath(const std::string &imagePath) const

{

    // Test path directly

    if (mIOHandler->Exists(imagePath)) {

        return imagePath;

    }

    ASSIMP_LOG_WARN("EmbedTexturesProcess: Cannot find image: ", imagePath, ". Will try to find it in root folder.");

    // Test path in root path

    std::string testPath = mRootPath + imagePath;

    if (mIOHandler->Exists(testPath)) {

        return testPath;

    }

    // Test path basename in root path

    testPath = mRootPath + imagePath.substr(imagePath.find_last_of("\\/") + 1u);

    if (mIOHandler->Exists(testPath)) {

        return testPath;

    }

    // In unix systems, '\' is a valid file name character, but some files may use \ as a directory separator.

    // Try replacing '\' by '/'.

    if (mIOHandler->getOsSeparator() != '\\' && imagePath.find('\\') != std::string::npos) {

        ASSIMP_LOG_WARN("EmbedTexturesProcess: Cannot find image '", imagePath, "' in root folder. Will try replacing directory separators.");

        testPath = imagePath;

        std::replace(testPath.begin(), testPath.end(), '\\', mIOHandler->getOsSeparator());

        return tryToFindValidPath(testPath);

    }

    ASSIMP_LOG_ERROR("EmbedTexturesProcess: Unable to embed texture: ", imagePath, ".");

    return {};

}

bool EmbedTexturesProcess::addTexture(aiScene *pScene, const std::string &path) const {

    std::streampos imageSize = 0;

    std::string    imagePath = tryToFindValidPath(path);

    if (imagePath.empty()) {

        return false;

    }

    IOStream* pFile = mIOHandler->Open(imagePath);

    if (pFile == nullptr) {

        ASSIMP_LOG_ERROR("EmbedTexturesProcess: Unable to embed texture: ", path, ".");

        return false;

    }

    imageSize = pFile->FileSize();

    aiTexel* imageContent = new aiTexel[ 1ul + static_cast<unsigned long>( imageSize ) / sizeof(aiTexel)];

    pFile->Seek(0, aiOrigin_SET);

    pFile->Read(reinterpret_cast<char*>(imageContent), static_cast<size_t>(imageSize), 1);

    mIOHandler->Close(pFile);

    // Enlarging the textures table

    unsigned int textureId = pScene->mNumTextures++;

    auto oldTextures = pScene->mTextures;

    pScene->mTextures = new aiTexture*[pScene->mNumTextures];

    ::memmove(pScene->mTextures, oldTextures, sizeof(aiTexture*) * (pScene->mNumTextures - 1u));

    delete [] oldTextures;

    // Add the new texture

    auto pTexture = new aiTexture;

    pTexture->mHeight = 0; // Means that this is still compressed

    pTexture->mWidth = static_cast<uint32_t>(imageSize);

    pTexture->pcData = imageContent;

    auto extension = path.substr(path.find_last_of('.') + 1u);

    extension = ai_tolower(extension);

    if (extension == "jpeg") {

        extension = "jpg";

    }

    size_t len = extension.size();

    if (len > HINTMAXTEXTURELEN -1 ) {

        len = HINTMAXTEXTURELEN - 1;

    }

    ::strncpy(pTexture->achFormatHint, extension.c_str(), len);

    pScene->mTextures[textureId] = pTexture;

    return true;

}