/*     Copyright 2015-2016 Egor Yusov
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
 *
 *  In no event and under no legal theory, whether in tort (including negligence), 
 *  contract, or otherwise, unless required by applicable law (such as deliberate 
 *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
 *  liable for any damages, including any direct, indirect, special, incidental, 
 *  or consequential damages of any character arising as a result of this License or 
 *  out of the use or inability to use the software (including but not limited to damages 
 *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
 *  all other commercial damages or losses), even if such Contributor has been advised 
 *  of the possibility of such damages.
 */

#include "pch.h"
#include "TextureUtilities.h"
#include "Errors.h"
#include "TextureLoader.h"
#include "Image.h"
#include "BasicFileStream.h"
#include "RefCntAutoPtr.h"
#include "DataBlobImpl.h"
#include <algorithm>

using namespace Diligent;

namespace Diligent
{

void CreateImageFromFile( const Diligent::Char *FilePath, 
                          Image **ppImage,
                          IDataBlob **ppDDSData)
{
    auto *pDotPos = strrchr( FilePath, '.' );
    if( pDotPos == nullptr )
        LOG_ERROR_AND_THROW( "File path ", FilePath, " does not contain extension" );

    auto *pExtension = pDotPos + 1;
    if( *pExtension == 0 )
        LOG_ERROR_AND_THROW( "File path ", FilePath, " contains empty extension" );

    String Extension(pExtension);
    std::transform( Extension.begin(), Extension.end(), Extension.begin(), ::tolower );

    Diligent::RefCntAutoPtr<BasicFileStream> pFileStream( new BasicFileStream( FilePath, EFileAccessMode::Read ) );

    if( Extension == "dds" )
    {
        VERIFY_EXPR(ppDDSData != nullptr);
        *ppDDSData = new DataBlobImpl;
        pFileStream->Read(*ppDDSData);
        (*ppDDSData)->AddRef();
    }
    else
    {
        ImageLoadInfo ImgLoadInfo;
        if( Extension == "png" )
            ImgLoadInfo.Format = EImageFileFormat::png;
        else if( Extension == "jpeg" || Extension == "jpg" )
            ImgLoadInfo.Format = EImageFileFormat::jpeg;
        else if( Extension == "tiff" || Extension == "tif" )
            ImgLoadInfo.Format = EImageFileFormat::tiff;
        else
            LOG_ERROR_AND_THROW( "Unsupported file format ", Extension );

        *ppImage = new Image(pFileStream, ImgLoadInfo);
        (*ppImage)->AddRef();
    }
}

void CreateTextureFromFile( const Diligent::Char *FilePath, 
                            const TextureLoadInfo& TexLoadInfo, 
                            IRenderDevice *pDevice, 
                            ITexture **ppTexture )
{
    RefCntAutoPtr<Image> pImage;
    RefCntAutoPtr<IDataBlob> pDDSData;
    CreateImageFromFile( FilePath, &pImage, &pDDSData );

    if( pImage )
        CreateTextureFromImage( pImage, TexLoadInfo, pDevice, ppTexture );
    else if(pDDSData)
        CreateTextureFromDDS( pDDSData, TexLoadInfo, pDevice, ppTexture );
}

}