/*
 * Copyright (c) 2002-2012, California Institute of Technology.
 * All rights reserved.  Based on Government Sponsored Research under contracts
 * NAS7-1407 and/or NAS7-03001.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *   1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *   2. 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.
 *   3. Neither the name of the California Institute of Technology (Caltech),
 * its operating division the Jet Propulsion Laboratory (JPL), the National
 * Aeronautics and Space Administration (NASA), nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * 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 CALIFORNIA INSTITUTE OF TECHNOLOGY 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.
 *
 * Copyright (c) 2014-2021 Esri
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Author: Lucian Plesea
 *
 */

/*
 * PNG band
 * PNG page compression and decompression functions
 * These functions are not methods, they reside in the global space
 *
 */

#include "marfa.h"
#include <cassert>
#include <algorithm>

CPL_C_START
#include <png.h>
CPL_C_END

NAMESPACE_MRF_START

// Do Nothing
static void flush_png(png_structp)
{
}

// Warning Emit
static void pngWH(png_struct * /*png*/, png_const_charp message)
{
    CPLError(CE_Warning, CPLE_AppDefined, "MRF: PNG warning %s", message);
}

// Fatal Warning
static void pngEH(png_struct *png, png_const_charp message)
{
    CPLError(CE_Failure, CPLE_AppDefined, "MRF: PNG Failure %s", message);
    longjmp(png_jmpbuf(png), 1);
}

// Read memory handlers for PNG
// No check for attempting to read past the end of the buffer

static void read_png(png_structp pngp, png_bytep data, png_size_t length)
{
    buf_mgr *pmgr = (buf_mgr *)png_get_io_ptr(pngp);
    if (pmgr->size < length)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "MRF: PNG Failure: Not enough bytes in buffer");
        longjmp(png_jmpbuf(pngp), 1);
    }
    memcpy(data, pmgr->buffer, length);
    pmgr->buffer += length;
    pmgr->size -= length;
}

static void write_png(png_structp pngp, png_bytep data, png_size_t length)
{
    buf_mgr *mgr = (buf_mgr *)png_get_io_ptr(pngp);
    // Buffer could be too small, trigger an error on debug mode
    assert(length <= mgr->size);
    memcpy(mgr->buffer, data, length);
    mgr->buffer += length;
    mgr->size -= length;
}

/**
 *\brief In memory decompression of PNG file
 */

CPLErr PNG_Codec::DecompressPNG(buf_mgr &dst, buf_mgr &src)
{
    const buf_mgr src_ori = src;
    png_bytep *png_rowp = nullptr;
    volatile png_bytep *p_volatile_png_rowp = (volatile png_bytep *)&png_rowp;

    // pngp=png_create_read_struct(PNG_LIBPNG_VER_STRING,0,pngEH,pngWH);
    png_structp pngp = png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr,
                                              nullptr, nullptr);
    if (nullptr == pngp)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "MRF: Error creating PNG decompress");
        return CE_Failure;
    }

    png_infop infop = png_create_info_struct(pngp);
    if (nullptr == infop)
    {
        png_destroy_read_struct(&pngp, &infop, nullptr);
        CPLError(CE_Failure, CPLE_AppDefined, "MRF: Error creating PNG info");
        return CE_Failure;
    }

    if (setjmp(png_jmpbuf(pngp)))
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "MRF: Error during PNG decompress");
        CPLFree((void *)(*p_volatile_png_rowp));
        png_destroy_read_struct(&pngp, &infop, nullptr);
        return CE_Failure;
    }

    // The mgr data ptr is already set up
    png_set_read_fn(pngp, &src, read_png);
    // Ready to read
    png_read_info(pngp, infop);

    if (png_get_bit_depth(pngp, infop) == 8)
    {
        // Use the PNG driver for decompression of 8-bit images, as it
        // has optimizations for whole image decompression.
        const CPLString osTmpFilename(VSIMemGenerateHiddenFilename("mrf.png"));
        VSIFCloseL(VSIFileFromMemBuffer(
            osTmpFilename.c_str(), reinterpret_cast<GByte *>(src_ori.buffer),
            src_ori.size, false));
        const char *const apszAllowedDrivers[] = {"PNG", nullptr};
        auto poDS = std::unique_ptr<GDALDataset>(GDALDataset::Open(
            osTmpFilename.c_str(), GDAL_OF_RASTER, apszAllowedDrivers));
        if (poDS && static_cast<GUIntBig>(poDS->GetRasterXSize()) *
                            poDS->GetRasterYSize() * poDS->GetRasterCount() ==
                        dst.size)
        {
            if (poDS->RasterIO(
                    GF_Read, 0, 0, poDS->GetRasterXSize(),
                    poDS->GetRasterYSize(), dst.buffer, poDS->GetRasterXSize(),
                    poDS->GetRasterYSize(), GDT_Byte, poDS->GetRasterCount(),
                    nullptr, poDS->GetRasterCount(), 0, 1, nullptr) == CE_None)
            {
                png_destroy_read_struct(&pngp, &infop, nullptr);
                VSIUnlink(osTmpFilename.c_str());
                return CE_None;
            }
        }
        VSIUnlink(osTmpFilename.c_str());
    }

    GInt32 height = static_cast<GInt32>(png_get_image_height(pngp, infop));
    // Check the size
    if (dst.size < (png_get_rowbytes(pngp, infop) * height))
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "MRF: PNG Page data bigger than the buffer provided");
        png_destroy_read_struct(&pngp, &infop, nullptr);
        return CE_Failure;
    }

    png_rowp = (png_bytep *)CPLMalloc(sizeof(png_bytep) * height);

    int rowbytes = static_cast<int>(png_get_rowbytes(pngp, infop));
    for (int i = 0; i < height; i++)
        png_rowp[i] = (png_bytep)dst.buffer + i * rowbytes;

#if defined(CPL_LSB)
    if (png_get_bit_depth(pngp, infop) > 8)
    {
        png_set_swap(pngp);
        // Call update info if any png_set is used
        png_read_update_info(pngp, infop);
    }
#endif

    // Finally, the read
    // This is the lower level, the png_read_end allows some transforms
    // Like palette to RGBA
    png_read_image(pngp, png_rowp);

    //    ppmWrite("Test.ppm",(char *)data,ILSize(512,512,1,4,0));
    // Required
    png_read_end(pngp, infop);

    // png_set_rows(pngp,infop,png_rowp);
    // png_read_png(pngp,infop,PNG_TRANSFORM_IDENTITY,0);

    CPLFree(png_rowp);
    png_destroy_read_struct(&pngp, &infop, nullptr);
    return CE_None;
}

/**
 *\brief Compress a page in PNG format
 * Returns the compressed size in dst.size
 *
 */

CPLErr PNG_Codec::CompressPNG(buf_mgr &dst, const buf_mgr &src)

{
    png_structp pngp;
    png_infop infop;
    buf_mgr mgr = dst;

    pngp =
        png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, pngEH, pngWH);
    if (!pngp)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "MRF: Error creating png structure");
        return CE_Failure;
    }
    infop = png_create_info_struct(pngp);
    if (!infop)
    {
        png_destroy_write_struct(&pngp, nullptr);
        CPLError(CE_Failure, CPLE_AppDefined,
                 "MRF: Error creating png info structure");
        return CE_Failure;
    }

    if (setjmp(png_jmpbuf(pngp)))
    {
        png_destroy_write_struct(&pngp, &infop);
        CPLError(CE_Failure, CPLE_AppDefined, "MRF: Error during png init");
        return CE_Failure;
    }

    png_set_write_fn(pngp, &mgr, write_png, flush_png);

    int png_ctype;

    switch (img.pagesize.c)
    {
        case 1:
            if (PNGColors != nullptr)
                png_ctype = PNG_COLOR_TYPE_PALETTE;
            else
                png_ctype = PNG_COLOR_TYPE_GRAY;
            break;
        case 2:
            png_ctype = PNG_COLOR_TYPE_GRAY_ALPHA;
            break;
        case 3:
            png_ctype = PNG_COLOR_TYPE_RGB;
            break;
        case 4:
            png_ctype = PNG_COLOR_TYPE_RGB_ALPHA;
            break;
        default:
        {  // This never happens if we check at the open
            CPLError(CE_Failure, CPLE_AppDefined,
                     "MRF:PNG Write with %d colors called", img.pagesize.c);
            return CE_Failure;
        }
    }

    png_set_IHDR(pngp, infop, img.pagesize.x, img.pagesize.y,
                 GDALGetDataTypeSize(img.dt), png_ctype, PNG_INTERLACE_NONE,
                 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);

    // Optional, force certain filters only.  Makes it somewhat faster but worse
    // compression png_set_filter(pngp, PNG_FILTER_TYPE_BASE, PNG_FILTER_SUB);

#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER > 10200) &&                     \
    defined(PNG_SELECT_READ)
    png_uint_32 mask, flags;

    flags = png_get_asm_flags(pngp);
    mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
    png_set_asm_flags(pngp, flags | mask);  // use flags &~mask to disable all
#endif

    // Let the quality control the compression level
    png_set_compression_level(pngp, std::clamp(img.quality / 10, 1, 9));

    // Custom strategy for zlib, set using the band option Z_STRATEGY
    if (deflate_flags & ZFLAG_SMASK)
        png_set_compression_strategy(pngp, (deflate_flags & ZFLAG_SMASK) >> 6);

    // Write the palette and the transparencies if they exist
    if (PNGColors != nullptr)
    {
        png_set_PLTE(pngp, infop, (png_colorp)PNGColors, PalSize);
        if (TransSize != 0)
            png_set_tRNS(pngp, infop, (unsigned char *)PNGAlpha, TransSize,
                         nullptr);
    }

    png_write_info(pngp, infop);

#if defined(CPL_LSB)
    if (img.dt != GDT_Byte)
        png_set_swap(pngp);
#endif

    png_bytep *png_rowp =
        (png_bytep *)CPLMalloc(sizeof(png_bytep) * img.pagesize.y);

    if (setjmp(png_jmpbuf(pngp)))
    {
        CPLFree(png_rowp);
        png_destroy_write_struct(&pngp, &infop);
        CPLError(CE_Failure, CPLE_AppDefined,
                 "MRF: Error during png compression");
        return CE_Failure;
    }

    int rowbytes = static_cast<int>(png_get_rowbytes(pngp, infop));
    for (int i = 0; i < img.pagesize.y; i++)
        png_rowp[i] = (png_bytep)(src.buffer + i * rowbytes);

    png_write_image(pngp, png_rowp);
    png_write_end(pngp, infop);

    // Done
    CPLFree(png_rowp);
    png_destroy_write_struct(&pngp, &infop);

    // Done
    // mgr.size holds the available bytes, so the size of the compressed png
    // is the original destination size minus the still available bytes
    dst.size -= mgr.size;

    return CE_None;
}

// Builds a PNG palette from a GDAL color table
static void ResetPalette(GDALColorTable *poCT, PNG_Codec &codec)
{  // Convert the GDAL LUT to PNG style
    codec.TransSize = codec.PalSize = poCT->GetColorEntryCount();

    png_color *pasPNGColors =
        (png_color *)CPLMalloc(sizeof(png_color) * codec.PalSize);
    unsigned char *pabyAlpha = (unsigned char *)CPLMalloc(codec.TransSize);
    codec.PNGColors = (void *)pasPNGColors;
    codec.PNGAlpha = (void *)pabyAlpha;
    bool NoTranspYet = true;

    // Set the palette from the end to reduce the size of the opacity mask
    for (int iColor = codec.PalSize - 1; iColor >= 0; iColor--)
    {
        GDALColorEntry sEntry;
        poCT->GetColorEntryAsRGB(iColor, &sEntry);

        pasPNGColors[iColor].red = (png_byte)sEntry.c1;
        pasPNGColors[iColor].green = (png_byte)sEntry.c2;
        pasPNGColors[iColor].blue = (png_byte)sEntry.c3;
        if (NoTranspYet && sEntry.c4 == 255)
            codec.TransSize--;
        else
        {
            NoTranspYet = false;
            pabyAlpha[iColor] = (unsigned char)sEntry.c4;
        }
    }
}

CPLErr PNG_Band::Decompress(buf_mgr &dst, buf_mgr &src)
{
    return codec.DecompressPNG(dst, src);
}

CPLErr PNG_Band::Compress(buf_mgr &dst, buf_mgr &src)
{
    if (!codec.PNGColors && img.comp == IL_PPNG)
    {  // Late set PNG palette to conserve memory
        GDALColorTable *poCT = GetColorTable();
        if (!poCT)
        {
            CPLError(CE_Failure, CPLE_NotSupported,
                     "MRF PPNG needs a color table");
            return CE_Failure;
        }
        ResetPalette(poCT, codec);
    }

    codec.deflate_flags = deflate_flags;
    return codec.CompressPNG(dst, src);
}

/**
 * \brief For PPNG, builds the data structures needed to write the palette
 * The presence of the PNGColors and PNGAlpha is used as a flag for PPNG only
 */

PNG_Band::PNG_Band(MRFDataset *pDS, const ILImage &image, int b, int level)
    : MRFRasterBand(pDS, image, b, level), codec(image)
{  // Check error conditions
    if (image.dt != GDT_Byte && image.dt != GDT_Int16 && image.dt != GDT_UInt16)
    {
        CPLError(CE_Failure, CPLE_NotSupported,
                 "Data type not supported by MRF PNG");
        return;
    }
    if (image.pagesize.c > 4)
    {
        CPLError(CE_Failure, CPLE_NotSupported,
                 "MRF PNG can only handle up to 4 bands per page");
        return;
    }
    // PNGs can be larger than the source, especially for small page size
    // If PPNG is used, the palette can take up to 2100 bytes
    poMRFDS->SetPBufferSize(
        static_cast<unsigned int>(1.1 * image.pageSizeBytes + 4000));
}

NAMESPACE_MRF_END
