/*
 * This file is a part of Luminance HDR package.
 * ----------------------------------------------------------------------
 * Copyright (C) 2013 Davide Anastasia
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * ----------------------------------------------------------------------
 */

#include <Libpfs/io/tiffreader.h>
#include <Libpfs/io/tiffcommon.h>

#include <Libpfs/frame.h>
#include <Libpfs/fixedstrideiterator.h>
#include <Libpfs/strideiterator.h>

#include <Libpfs/colorspace/xyz.h>
#include <Libpfs/colorspace/cmyk.h>
#include <Libpfs/colorspace/lcms.h>
#include <Libpfs/colorspace/copy.h>

#include <Libpfs/utils/resourcehandlerlcms.h>
#include <Libpfs/utils/transform.h>

#include <tiffio.h>

#include <cmath>
#include <iostream>
#include <vector>
#include <stdexcept>
#include <cassert>
#include <utility>

#include <boost/assign.hpp>
#include <boost/bind.hpp>
#include <boost/function.hpp>
#include <boost/lexical_cast.hpp>

using namespace pfs;
using namespace pfs::utils;
using namespace boost::assign;

#ifndef NDEBUG
#define PRINT_DEBUG(str) std::cerr << "TiffReader: " << str << std::endl
#else
#define PRINT_DEBUG(str)
#endif

//! \brief This code is taken from tificc.c from libcms distribution and
//! sligthly modified
//! \ref http://svn.ghostscript.com/ghostscript/trunk/gs/lcms2/utils/tificc/tificc.c
static
cmsHPROFILE GetTIFFProfile(TIFF* in)
{
    cmsHPROFILE hProfile;
    void* iccProfilePtr;
    cmsUInt32Number iccProfileSize;

    if (TIFFGetField(in, TIFFTAG_ICCPROFILE, &iccProfileSize, &iccProfilePtr))
    {
        PRINT_DEBUG("iccProfileSize: " << iccProfileSize);
        hProfile = cmsOpenProfileFromMem(iccProfilePtr, iccProfileSize);

        if (hProfile) return hProfile;
    }

    // Try to see if "colorimetric" tiff.data()
    cmsCIExyYTRIPLE primaries;
    cmsCIExyY whitePoint;
    cmsToneCurve* curve[3];

    cmsFloat32Number* chr;
    if ( !TIFFGetField(in, TIFFTAG_PRIMARYCHROMATICITIES, &chr) ) {
        return 0;
    }
    primaries.Red.x     = chr[0];
    primaries.Red.y     = chr[1];
    primaries.Green.x   = chr[2];
    primaries.Green.y   = chr[3];
    primaries.Blue.x    = chr[4];
    primaries.Blue.y    = chr[5];

    primaries.Red.Y = primaries.Green.Y = primaries.Blue.Y = 1.0;

    cmsFloat32Number* wp;
    if (!TIFFGetField (in, TIFFTAG_WHITEPOINT, &wp)) {
        return 0;
    }

    whitePoint.x = wp[0];
    whitePoint.y = wp[1];
    whitePoint.Y = 1.0;

    // Transferfunction is a bit harder....
    cmsUInt16Number *gmr;
    cmsUInt16Number *gmg;
    cmsUInt16Number *gmb;

    TIFFGetFieldDefaulted(in, TIFFTAG_TRANSFERFUNCTION, &gmr, &gmg, &gmb);

    curve[0] = cmsBuildTabulatedToneCurve16(NULL, 256, gmr);
    curve[1] = cmsBuildTabulatedToneCurve16(NULL, 256, gmg);
    curve[2] = cmsBuildTabulatedToneCurve16(NULL, 256, gmb);

    hProfile = cmsCreateRGBProfile (&whitePoint, &primaries, curve);

    cmsFreeToneCurve(curve[0]);
    cmsFreeToneCurve(curve[1]);
    cmsFreeToneCurve(curve[2]);

    return hProfile;
}
// End of code form tifficc.c

namespace pfs {
namespace io {

struct TiffReaderParams {};

struct TiffReaderData
{
    // < photometric type, bits per sample >
    typedef boost::function<void (TiffReaderData*, Frame&, const TiffReaderParams&)> Callback;

    TiffReaderData()
        : hasAlpha_(false)
        , stonits_(1.0)
        , currentCallback_( boost::bind(&TiffReaderData::doNothing, _1, _2, _3) )
        , hsRGB_( cmsCreate_sRGBProfile() )
    {}

    // public members...
    ScopedTiffFile file_;

    uint32 height_;
    uint32 width_;

    uint16 compressionType_;                    // compression type
    uint16 photometricType_;                    // type of photometric data

    uint16 bitsPerSample_;                      // bits per sample
    uint16 samplesPerPixel_;                    // number of channels in tiff file (only 1-3 are used)
    bool   hasAlpha_;

    double stonits_;                            // scale factor to get nit values

    Callback currentCallback_;

    ScopedCmsProfile hsRGB_;                    // (  );
    ScopedCmsProfile hIn_;                      // ( GetTIFFProfile(tif) );

    // public functions
    inline
    TIFF* handle() { return file_.data(); }

    void read(Frame &frame, const Params& /*params*/)
    {
        currentCallback_(this, frame, TiffReaderParams());
    }

    void initReader()
    {
        typedef std::pair<uint16, uint16> RegistryKey;
        typedef std::map<RegistryKey, Callback> Registry;

        /*static*/ Registry sm_registry = map_list_of
                // (RegistryKey(PHOTOMETRIC_LOGLUV, 32), boost::bind(&TiffReaderData::readLogLuv, _1, _2, _3)) // <
                (RegistryKey(PHOTOMETRIC_LOGLUV, 16),       boost::bind(&TiffReaderData::readLogLuv, _1, _2, _3))
                (RegistryKey(PHOTOMETRIC_SEPARATED, 8),     boost::bind(&TiffReaderData::readCMYK<uint8_t>, _1, _2, _3))
                (RegistryKey(PHOTOMETRIC_SEPARATED, 16),    boost::bind(&TiffReaderData::readCMYK<uint16_t>, _1, _2, _3))
                // (RegistryKey(PHOTOMETRIC_SEPARATED, 32), boost::bind(&TiffReaderData::readCMYK<float>, _1, _2, _3))
                (RegistryKey(PHOTOMETRIC_RGB, 8),           boost::bind(&TiffReaderData::readRGB<uint8_t>, _1, _2, _3))
                (RegistryKey(PHOTOMETRIC_RGB, 16),          boost::bind(&TiffReaderData::readRGB<uint16_t>, _1, _2, _3))
                (RegistryKey(PHOTOMETRIC_RGB, 32),          boost::bind(&TiffReaderData::readRGB<float>, _1, _2, _3))
                ;

        Registry::iterator it = sm_registry.find(RegistryKey(photometricType_, bitsPerSample_));
        if ( it == sm_registry.end() ) {
            throw pfs::io::InvalidHeader(std::string("TiffReader: cannot find the right function to parse the data ") +
                                         "bits per sample: " + boost::lexical_cast<std::string>(bitsPerSample_) +
                                         " photometric type: " + boost::lexical_cast<std::string>(photometricType_));
        }
        currentCallback_ = it->second;
    }

    // private stuff...
private:
    cmsHTRANSFORM getColorSpaceTransform()
    {
        if ( !hIn_ ) {
            PRINT_DEBUG("No available input profile");
            return NULL;
        }

        PRINT_DEBUG("Available ICC Profile, building LCMS Transform");

        cmsUInt32Number cmsInputFormat  = TYPE_RGB_8;
        cmsUInt32Number cmsOutputFormat = TYPE_RGB_FLT;
        cmsUInt32Number cmsIntent       = INTENT_PERCEPTUAL;

        switch ( photometricType_ ) {
        case PHOTOMETRIC_RGB: {
            switch (bitsPerSample_) {
            case 32: {
                if (hasAlpha_) {
                    cmsInputFormat = TYPE_RGBA_FLT;
                } else {
                    cmsInputFormat = TYPE_RGB_FLT;
                }
            } break;
            case 16: {
                if (hasAlpha_) {
                    cmsInputFormat = TYPE_RGBA_16;
                } else {
                    cmsInputFormat = TYPE_RGB_16;
                }
            } break;
            default:
            case 8: {
                if (hasAlpha_) {
                    cmsInputFormat = TYPE_RGBA_8;
                } else {
                    cmsInputFormat = TYPE_RGB_8;
                }
            }
            } // switch
        } break;
        case PHOTOMETRIC_SEPARATED : {
            switch (bitsPerSample_) {
            case 32: {
                cmsInputFormat = TYPE_CMYK_FLT;
            } break;
            case 16: {
                cmsInputFormat = TYPE_CMYK_16;
            } break;
            default:
            case 8: {
                cmsInputFormat = TYPE_CMYK_8;
            }
            } // switch
        } break;
        }

        return cmsCreateTransform (hIn_.data(), cmsInputFormat,
                                   hsRGB_.data(), cmsOutputFormat,
                                   cmsIntent, 0);
    }

    void doNothing(Frame &/*frame*/, const TiffReaderParams& /*params*/) {}

    template <typename InputDataType, typename Converter>
    void read3Components(Frame& frame, const TiffReaderParams& /*params*/,
                         const Converter& conv)
    {
        assert(samplesPerPixel_ >= 3);
        Frame tempFrame(width_, height_);

        pfs::Channel* Xc;
        pfs::Channel* Yc;
        pfs::Channel* Zc;
        tempFrame.createXYZChannels(Xc, Yc, Zc);

        std::vector<InputDataType> tempBuffer(width_*samplesPerPixel_);
        for (uint32 row = 0; row < height_; row++)
        {
            TIFFReadScanline(handle(), tempBuffer.data(), row);

            utils::transform(StrideIterator<InputDataType*>(tempBuffer.data(), samplesPerPixel_),
                             StrideIterator<InputDataType*>(tempBuffer.data() + width_*samplesPerPixel_, samplesPerPixel_),
                             StrideIterator<InputDataType*>(tempBuffer.data() + 1, samplesPerPixel_),
                             StrideIterator<InputDataType*>(tempBuffer.data() + 2, samplesPerPixel_),
                             Xc->row_begin(row),
                             Yc->row_begin(row),
                             Zc->row_begin(row),
                             conv);
        }

        tempFrame.swap(frame);
    }

    template <typename InputDataType, typename Converter>
    void read4Components(Frame& frame, const TiffReaderParams& /*params*/,
                         const Converter& conv)
    {
        assert(samplesPerPixel_ >= 4);
        Frame tempFrame(width_, height_);

        pfs::Channel* Xc;
        pfs::Channel* Yc;
        pfs::Channel* Zc;
        tempFrame.createXYZChannels(Xc, Yc, Zc);

        std::vector<InputDataType> tempBuffer(width_*samplesPerPixel_);
        for (uint32 row = 0; row < height_; row++)
        {
            TIFFReadScanline(handle(), tempBuffer.data(), row);

            utils::transform(StrideIterator<InputDataType*>(tempBuffer.data(), samplesPerPixel_),
                             StrideIterator<InputDataType*>(tempBuffer.data() + width_*samplesPerPixel_, samplesPerPixel_),
                             StrideIterator<InputDataType*>(tempBuffer.data() + 1, samplesPerPixel_),
                             StrideIterator<InputDataType*>(tempBuffer.data() + 2, samplesPerPixel_),
                             StrideIterator<InputDataType*>(tempBuffer.data() + 3, samplesPerPixel_),
                             Xc->row_begin(row),
                             Yc->row_begin(row),
                             Zc->row_begin(row),
                             conv);
        }

        tempFrame.swap(frame);
    }

    template <typename InputDataType> //, typename ConversionOperator>
    void readRGB(Frame & frame, const TiffReaderParams& params)
    {
#ifndef NDEBUG
        std::cout << __func__ << typeid(InputDataType).name() << std::endl;
        assert(samplesPerPixel_ >= 3);
#endif

        ScopedCmsTransform xform( getColorSpaceTransform() );
        if ( xform ) {
            PRINT_DEBUG("ICC Profile Available");
            if ( hasAlpha_ ) {
                read4Components<InputDataType>(frame, params,
                                colorspace::Convert4LCMS3(xform.data()));
            } else {
                read3Components<InputDataType>(frame, params,
                                colorspace::Convert3LCMS3(xform.data()));
            }
        } else {
            read3Components<InputDataType>(frame, params, colorspace::Copy());
        }
    }

    void readLogLuv(Frame &frame, const TiffReaderParams& params)
    {
#ifndef NDEBUG
        std::cout << __func__ << std::endl;
        assert(samplesPerPixel_ == 3);
#endif

        read3Components<float>(frame, params, colorspace::ConvertXYZ2RGB());
    }

    template <typename InputDataType>
    void readCMYK(Frame & frame, const TiffReaderParams& params)
    {
#ifndef NDEBUG
        std::cout << __func__ << typeid(InputDataType).name() << std::endl;
        assert(samplesPerPixel_ == 4);
#endif

        ScopedCmsTransform xform( getColorSpaceTransform() );
        if ( xform ) {
            PRINT_DEBUG("ICC Profile Available");

            read4Components<InputDataType>(frame, params,
                                           colorspace::Convert4LCMS3(xform.data()));

        } else {
            read4Components<InputDataType>(frame, params,
                                           colorspace::ConvertCMYK2RGB());
        }
    }
};

TiffReader::TiffReader(const string &filename)
    : FrameReader(filename)
    , m_data(new TiffReaderData)
{
    TiffReader::open();
}

TiffReader::~TiffReader() {
    TiffReader::close();
}

bool TiffReader::isOpen() const {
    return m_data->file_;
}

void TiffReader::close() {
    m_data.reset(new TiffReaderData);
}

void TiffReader::open()
{
    m_data->file_.reset(TIFFOpen(filename().c_str(), "r"));
    if ( !m_data->file_ ) {
        throw pfs::io::InvalidFile("TiffReader: cannot open file " + filename());
    }

    TIFFGetField(m_data->handle(), TIFFTAG_IMAGEWIDTH, &m_data->width_);
    TIFFGetField(m_data->handle(), TIFFTAG_IMAGELENGTH, &m_data->height_);

    if ( m_data->width_ <= 0 || m_data->height_ <= 0 ) {
        throw pfs::io::InvalidHeader("TiffReader: invalid image size");
    }
    setWidth(m_data->width_);
    setHeight(m_data->height_);

    // check if planar... maybe in the future we can add support for tiled images?
    uint16 planarConfig;
    TIFFGetField(m_data->handle(), TIFFTAG_PLANARCONFIG, &planarConfig);
    if ( planarConfig != PLANARCONFIG_CONTIG ) {
        throw pfs::io::InvalidHeader("TiffReader: Unsopported planar configuration");
    }

    // compression type
    if (!TIFFGetField(m_data->handle(), TIFFTAG_COMPRESSION, &m_data->compressionType_))	{
        m_data->compressionType_ = COMPRESSION_NONE;
    }
    // photometric type
    if (!TIFFGetFieldDefaulted(m_data->handle(), TIFFTAG_PHOTOMETRIC, &m_data->photometricType_)) {
        throw pfs::io::InvalidHeader("TiffReader: unspecified photometric type");
    }

    if (!TIFFGetField(m_data->handle(), TIFFTAG_STONITS, &m_data->stonits_)) {
        m_data->stonits_ = 1.;
    }

    // bits per sample
    if (!TIFFGetField(m_data->handle(), TIFFTAG_BITSPERSAMPLE, &m_data->bitsPerSample_) ) {
        throw pfs::io::InvalidHeader("TiffReader: unspecified bits per sample");
    }
    if ( m_data->bitsPerSample_ != 8 && m_data->bitsPerSample_ != 16 && m_data->bitsPerSample_ != 32) {
        throw pfs::io::InvalidHeader("TiffReader: invalid bits per sample (read: " +
                                     boost::lexical_cast<std::string>(m_data->bitsPerSample_) +
                                     ")");
    }

    // samples per pixel
    if (!TIFFGetField(m_data->handle(), TIFFTAG_SAMPLESPERPIXEL, &m_data->samplesPerPixel_) ) {
        throw pfs::io::InvalidHeader("TiffReader: unspecified samples per pixel");
    }

    // parse photometric type
    switch ( m_data->photometricType_ ) {
    case PHOTOMETRIC_LOGLUV: {
        if (m_data->compressionType_ != COMPRESSION_SGILOG &&
                m_data->compressionType_ != COMPRESSION_SGILOG24) {
            throw pfs::io::InvalidHeader("TiffReader: only support SGILOG compressed LogLuv data");
        }
        TIFFSetField(m_data->handle(), TIFFTAG_SGILOGDATAFMT, SGILOGDATAFMT_FLOAT);
    } break;
    case PHOTOMETRIC_RGB: {
        uint16 *extraSamplesTypes = 0;
        uint16 extraSamplesPerPixel = 0;

        // read extra samples (# of alpha channels)
        if (!TIFFGetField(m_data->handle(), TIFFTAG_EXTRASAMPLES, &extraSamplesPerPixel, &extraSamplesTypes)) {
            extraSamplesPerPixel = 0;
        }
        uint16 colorSamples = m_data->samplesPerPixel_ - extraSamplesPerPixel;
        m_data->hasAlpha_ = (extraSamplesPerPixel == 1);
        if (colorSamples != 3) {
            throw pfs::io::InvalidHeader("TIFF: unsupported samples per pixel for RGB");
        }
    } break;
    case PHOTOMETRIC_SEPARATED: {
        if ( m_data->samplesPerPixel_ != 4 ) {
            throw pfs::io::InvalidHeader("TIFF: unsupported samples per pixel for CMYK");
        }
    } break;
    default: {
        throw pfs::io::InvalidHeader("TiffReader: unsupported photometric type");
    } break;
    }

    // ...based on photometric type and bits per samples, will make ready the
    // right callback to read the data
    m_data->initReader();
    m_data->hIn_.reset( GetTIFFProfile(m_data->handle()) );
}

#define CALL_MEMBER_FN(object,ptrToMember)  ((object).*(ptrToMember))

void TiffReader::read(Frame &frame, const Params &params)
{
    if ( !isOpen() ) {
        open();
    }

    m_data->read(frame, params);
}

}   // io
}   // pfs
