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#include "precomp.hpp"

// GDAL Macros
#include "cvconfig.h"

#ifdef HAVE_GDAL

// Our Header
#include "grfmt_gdal.hpp"


/// C++ Standard Libraries
#include <iostream>
#include <stdexcept>
#include <string>


namespace cv{


/**
 * Convert GDAL Palette Interpretation to OpenCV Pixel Type
*/
int  gdalPaletteInterpretation2OpenCV( GDALPaletteInterp const& paletteInterp, GDALDataType const& gdalType ){

    switch( paletteInterp ){

        /// GRAYSCALE
        case GPI_Gray:
            if( gdalType == GDT_Byte    ){ return CV_8UC1;  }
            if( gdalType == GDT_UInt16  ){ return CV_16UC1; }
            if( gdalType == GDT_Int16   ){ return CV_16SC1; }
            if( gdalType == GDT_UInt32  ){ return CV_32SC1; }
            if( gdalType == GDT_Int32   ){ return CV_32SC1; }
            if( gdalType == GDT_Float32 ){ return CV_32FC1; }
            if( gdalType == GDT_Float64 ){ return CV_64FC1; }
            return -1;

        /// RGB
        case GPI_RGB:
            if( gdalType == GDT_Byte    ){ return CV_8UC1;  }
            if( gdalType == GDT_UInt16  ){ return CV_16UC3; }
            if( gdalType == GDT_Int16   ){ return CV_16SC3; }
            if( gdalType == GDT_UInt32  ){ return CV_32SC3; }
            if( gdalType == GDT_Int32   ){ return CV_32SC3; }
            if( gdalType == GDT_Float32 ){ return CV_32FC3; }
            if( gdalType == GDT_Float64 ){ return CV_64FC3; }
            return -1;


        /// otherwise
        default:
            return -1;

    }
}

/**
 * Convert gdal type to opencv type
*/
int gdal2opencv( const GDALDataType& gdalType, const int& channels ){

    switch( gdalType ){

        /// UInt8
        case GDT_Byte:
            if( channels == 1 ){ return CV_8UC1; }
            if( channels == 3 ){ return CV_8UC3; }
            if( channels == 4 ){ return CV_8UC4; }
            return -1;

        /// UInt16
        case GDT_UInt16:
            if( channels == 1 ){ return CV_16UC1; }
            if( channels == 3 ){ return CV_16UC3; }
            if( channels == 4 ){ return CV_16UC4; }
            return -1;

        /// Int16
        case GDT_Int16:
            if( channels == 1 ){ return CV_16SC1; }
            if( channels == 3 ){ return CV_16SC3; }
            if( channels == 4 ){ return CV_16SC4; }
            return -1;

        /// UInt32
        case GDT_UInt32:
        case GDT_Int32:
            if( channels == 1 ){ return CV_32SC1; }
            if( channels == 3 ){ return CV_32SC3; }
            if( channels == 4 ){ return CV_32SC4; }
            return -1;

        default:
            std::cout << "Unknown GDAL Data Type" << std::endl;
            std::cout << "Type: " << GDALGetDataTypeName(gdalType) << std::endl;
            return -1;
    }

    return -1;
}

/**
 * GDAL Decoder Constructor
*/
GdalDecoder::GdalDecoder(){


    // set a dummy signature
    m_signature="0";
    for( size_t i=0; i<160; i++ ){
        m_signature += "0";
    }

    /// Register the driver
    GDALAllRegister();

    m_driver = NULL;
    m_dataset = NULL;
}

/**
 * GDAL Decoder Destructor
*/
GdalDecoder::~GdalDecoder(){


    if( m_dataset != NULL ){
       close();
    }
}

/**
 * Convert data range
*/
double range_cast( const GDALDataType& gdalType,
                   const int& cvDepth,
                   const double& value )
{

    // uint8 -> uint8
    if( gdalType == GDT_Byte && cvDepth == CV_8U ){
        return value;
    }
    // uint8 -> uint16
    if( gdalType == GDT_Byte && (cvDepth == CV_16U || cvDepth == CV_16S)){
        return (value*256);
    }

    // uint8 -> uint32
    if( gdalType == GDT_Byte && (cvDepth == CV_32F || cvDepth == CV_32S)){
        return (value*16777216);
    }

    // int16 -> uint8
    if( (gdalType == GDT_UInt16 || gdalType == GDT_Int16) && cvDepth == CV_8U ){
        return std::floor(value/256.0);
    }

    // int16 -> int16
    if( (gdalType == GDT_UInt16 || gdalType == GDT_Int16) &&
        ( cvDepth == CV_16U     ||  cvDepth == CV_16S   )){
        return value;
    }

    std::cout << GDALGetDataTypeName( gdalType ) << std::endl;
    std::cout << "warning: unknown range cast requested." << std::endl;
    return (value);
}


/**
 * There are some better mpl techniques for doing this.
*/
void write_pixel( const double& pixelValue,
                  const GDALDataType& gdalType,
                  const int& gdalChannels,
                  Mat& image,
                  const int& row,
                  const int& col,
                  const int& channel ){

    // convert the pixel
    double newValue = range_cast(gdalType, image.depth(), pixelValue );

    // input: 1 channel, output: 1 channel
    if( gdalChannels == 1 && image.channels() == 1 ){
        if( image.depth() == CV_8U ){       image.at<uchar>(row,col)          = newValue; }
        else if( image.depth() == CV_16U ){ image.at<unsigned short>(row,col) = newValue; }
        else if( image.depth() == CV_16S ){ image.at<short>(row,col)          = newValue; }
        else if( image.depth() == CV_32S ){ image.at<int>(row,col)            = newValue; }
        else if( image.depth() == CV_32F ){ image.at<float>(row,col)          = newValue; }
        else if( image.depth() == CV_64F ){ image.at<double>(row,col)         = newValue; }
        else{ throw std::runtime_error("Unknown image depth, gdal: 1, img: 1"); }
    }

    // input: 1 channel, output: 3 channel
    else if( gdalChannels == 1 && image.channels() == 3 ){
        if( image.depth() == CV_8U ){   image.at<Vec3b>(row,col) = Vec3b(newValue,newValue,newValue); }
        else if( image.depth() == CV_16U ){  image.at<Vec3s>(row,col) = Vec3s(newValue,newValue,newValue); }
        else if( image.depth() == CV_16S ){  image.at<Vec3s>(row,col) = Vec3s(newValue,newValue,newValue); }
        else if( image.depth() == CV_32S ){  image.at<Vec3i>(row,col) = Vec3i(newValue,newValue,newValue); }
        else if( image.depth() == CV_32F ){  image.at<Vec3f>(row,col) = Vec3f(newValue,newValue,newValue); }
        else if( image.depth() == CV_64F ){  image.at<Vec3d>(row,col) = Vec3d(newValue,newValue,newValue); }
        else{                          throw std::runtime_error("Unknown image depth, gdal:1, img: 3"); }
    }

    // input: 3 channel, output: 1 channel
    else if( gdalChannels == 3 && image.channels() == 1 ){
        if( image.depth() == CV_8U ){   image.at<uchar>(row,col) += (newValue/3.0); }
        else{ throw std::runtime_error("Unknown image depth, gdal:3, img: 1"); }
    }

    // input: 4 channel, output: 1 channel
    else if( gdalChannels == 4 && image.channels() == 1 ){
        if( image.depth() == CV_8U ){   image.at<uchar>(row,col) = newValue;  }
        else{ throw std::runtime_error("Unknown image depth, gdal: 4, image: 1"); }
    }

    // input: 3 channel, output: 3 channel
    else if( gdalChannels == 3 && image.channels() == 3 ){
        if( image.depth() == CV_8U ){  image.at<Vec3b>(row,col)[channel] = newValue;  }
        else if( image.depth() == CV_16U ){  image.at<Vec3s>(row,col)[channel] = newValue;  }
        else if( image.depth() == CV_16S ){  image.at<Vec3s>(row,col)[channel] = newValue;  }
        else if( image.depth() == CV_32S ){  image.at<Vec3i>(row,col)[channel] = newValue;  }
        else if( image.depth() == CV_32F ){  image.at<Vec3f>(row,col)[channel] = newValue;  }
        else if( image.depth() == CV_64F ){  image.at<Vec3d>(row,col)[channel] = newValue;  }
        else{ throw std::runtime_error("Unknown image depth, gdal: 3, image: 3"); }
    }

    // input: 4 channel, output: 3 channel
    else if( gdalChannels == 4 && image.channels() == 3 ){
        if( channel >= 4 ){ return; }
        else if( image.depth() == CV_8U  && channel < 4  ){  image.at<Vec3b>(row,col)[channel] = newValue;  }
        else if( image.depth() == CV_16U && channel < 4 ){  image.at<Vec3s>(row,col)[channel] = newValue;  }
        else if( image.depth() == CV_16S && channel < 4 ){  image.at<Vec3s>(row,col)[channel] = newValue;  }
        else if( image.depth() == CV_32S && channel < 4 ){  image.at<Vec3i>(row,col)[channel] = newValue;  }
        else if( image.depth() == CV_32F && channel < 4 ){  image.at<Vec3f>(row,col)[channel] = newValue;  }
        else if( image.depth() == CV_64F && channel < 4 ){  image.at<Vec3d>(row,col)[channel] = newValue;  }
        else{ throw std::runtime_error("Unknown image depth, gdal: 4, image: 3"); }
    }

    // input: 4 channel, output: 4 channel
    else if( gdalChannels == 4 && image.channels() == 4 ){
        if( image.depth() == CV_8U ){  image.at<Vec4b>(row,col)[channel] = newValue;  }
        else{ throw std::runtime_error("Unknown image depth, gdal: 4, image: 4"); }
    }

    // otherwise, throw an error
    else{
        throw std::runtime_error("error: can't convert types.");
    }

}


void write_ctable_pixel( const double& pixelValue,
                         const GDALDataType& gdalType,
                         GDALColorTable const* gdalColorTable,
                         Mat& image,
                         const int& y,
                         const int& x,
                         const int& c ){

    if( gdalColorTable == NULL ){
       write_pixel( pixelValue, gdalType, 1, image, y, x, c );
    }

    // if we are Grayscale, then do a straight conversion
    if( gdalColorTable->GetPaletteInterpretation() == GPI_Gray ){
        write_pixel( pixelValue, gdalType, 1, image, y, x, c );
    }

    // if we are rgb, then convert here
    else if( gdalColorTable->GetPaletteInterpretation() == GPI_RGB ){

        // get the pixel
        short r = gdalColorTable->GetColorEntry( (int)pixelValue )->c1;
        short g = gdalColorTable->GetColorEntry( (int)pixelValue )->c2;
        short b = gdalColorTable->GetColorEntry( (int)pixelValue )->c3;
        short a = gdalColorTable->GetColorEntry( (int)pixelValue )->c4;

        write_pixel( r, gdalType, 4, image, y, x, 2 );
        write_pixel( g, gdalType, 4, image, y, x, 1 );
        write_pixel( b, gdalType, 4, image, y, x, 0 );
        if( image.channels() > 3 ){
            write_pixel( a, gdalType, 4, image, y, x, 1 );
        }
    }

    // otherwise, set zeros
    else{
        write_pixel( pixelValue, gdalType, 1, image, y, x, c );
    }
}



/**
 * read data
*/
bool GdalDecoder::readData( Mat& img ){


    // make sure the image is the proper size
    if( img.size().height != m_height ){
        return false;
    }
    if( img.size().width != m_width ){
        return false;
    }

    // make sure the raster is alive
    if( m_dataset == NULL || m_driver == NULL ){
        return false;
    }

    // set the image to zero
    img = 0;


    // iterate over each raster band
    // note that OpenCV does bgr rather than rgb
    int nChannels = m_dataset->GetRasterCount();
    GDALColorTable* gdalColorTable = NULL;
    if( m_dataset->GetRasterBand(1)->GetColorTable() != NULL ){
        gdalColorTable = m_dataset->GetRasterBand(1)->GetColorTable();
    }

    const GDALDataType gdalType = m_dataset->GetRasterBand(1)->GetRasterDataType();
    int nRows, nCols;

    if( nChannels > img.channels() ){
        nChannels = img.channels();
    }

    for( int c = 0; c<nChannels; c++ ){

        // get the GDAL Band
        GDALRasterBand* band = m_dataset->GetRasterBand(c+1);

        // make sure the image band has the same dimensions as the image
        if( band->GetXSize() != m_width || band->GetYSize() != m_height ){ return false; }

        // grab the raster size
        nRows = band->GetYSize();
        nCols = band->GetXSize();

        // create a temporary scanline pointer to store data
        double* scanline = new double[nCols];

        // iterate over each row and column
        for( int y=0; y<nRows; y++ ){

            // get the entire row
            band->RasterIO( GF_Read, 0, y, nCols, 1, scanline, nCols, 1, GDT_Float64, 0, 0);

            // set inside the image
            for( int x=0; x<nCols; x++ ){

                // set depending on image types
                //   given boost, I would use enable_if to speed up.  Avoid for now.
                if( hasColorTable == false ){
                    write_pixel( scanline[x], gdalType, nChannels, img, y, x, c );
                }
                else{
                    write_ctable_pixel( scanline[x], gdalType, gdalColorTable, img, y, x, c );
                }
            }
        }

        // delete our temp pointer
        delete [] scanline;


    }

    return true;
}


/**
 * Read image header
*/
bool GdalDecoder::readHeader(){

    // load the dataset
    m_dataset = (GDALDataset*) GDALOpen( m_filename.c_str(), GA_ReadOnly);

    // if dataset is null, then there was a problem
    if( m_dataset == NULL ){
        return false;
    }

    // make sure we have pixel data inside the raster
    if( m_dataset->GetRasterCount() <= 0 ){
        return false;
    }

    //extract the driver infomation
    m_driver = m_dataset->GetDriver();

    // if the driver failed, then exit
    if( m_driver == NULL ){
        return false;
    }


    // get the image dimensions
    m_width = m_dataset->GetRasterXSize();
    m_height= m_dataset->GetRasterYSize();

    // make sure we have at least one band/channel
    if( m_dataset->GetRasterCount() <= 0 ){
        return false;
    }

    // check if we have a color palette
    int tempType;
    if( m_dataset->GetRasterBand(1)->GetColorInterpretation() == GCI_PaletteIndex ){

        // remember that we have a color palette
        hasColorTable = true;

        // if the color tables does not exist, then we failed
        if( m_dataset->GetRasterBand(1)->GetColorTable() == NULL ){
            return false;
        }

        // otherwise, get the pixeltype
        else{
            // convert the palette interpretation to opencv type
            tempType = gdalPaletteInterpretation2OpenCV( m_dataset->GetRasterBand(1)->GetColorTable()->GetPaletteInterpretation(),
                                                         m_dataset->GetRasterBand(1)->GetRasterDataType() );

            if( tempType == -1 ){
                return false;
            }
            m_type = tempType;
        }

    }

    // otherwise, we have standard channels
    else{

        // remember that we don't have a color table
        hasColorTable = false;

        // convert the datatype to opencv
        tempType = gdal2opencv( m_dataset->GetRasterBand(1)->GetRasterDataType(), m_dataset->GetRasterCount() );
        if( tempType == -1 ){
            return false;
        }
        m_type = tempType;
    }

    return true;
}

/**
 * Close the module
*/
void GdalDecoder::close(){


    GDALClose((GDALDatasetH)m_dataset);
    m_dataset = NULL;
    m_driver = NULL;
}

/**
 * Create a new decoder
*/
ImageDecoder GdalDecoder::newDecoder()const{
    return makePtr<GdalDecoder>();
}

/**
 * Test the file signature
*/
bool GdalDecoder::checkSignature( const String& signature )const{


    // look for NITF
    std::string str = signature.c_str();
    if( str.substr(0,4).find("NITF") != std::string::npos ){
        return true;
    }

    // look for DTED
    if( str.substr(140,4) == "DTED" ){
        return true;
    }

    return false;
}

} /// End of cv Namespace

#endif /**< End  of HAVE_GDAL Definition */