/* -----------------------------------------------------------------------------

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other Intellectual Property Rights other than the copyrights concerning 

the Software are granted under this license.

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Copyright (c) 2019-2026, Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. & The VVenC Authors.

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     * Redistributions of source code must retain the above copyright notice,

     this list of conditions and the following disclaimer.

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------------------------------------------------------------------------------------------- */

/** \file     FileIOHelper.h

    \brief    file I/O helper class (header)

*/

#pragma once

#include <iostream>

#include <fstream>

#include <sstream>

#include <string>

#include <vector>

#include <algorithm>

#include <regex>

#include "vvenc/vvencCfg.h"

#include "vvenc/vvenc.h"

#if defined (_WIN32) || defined (WIN32) || defined (_WIN64) || defined (WIN64)

#include <io.h>

#include <fcntl.h>

#endif

//! \ingroup Interface

//! \{

struct vvencYUVBuffer;

namespace apputils {

typedef int16_t LPel;

// ====================================================================================================================

class FileIOHelper

{

public:

  static std::string getFileExtension( std::string fileName )

  {

    std::string ext;

    if(fileName.find_last_of(".") != std::string::npos)

    {

      ext = fileName.substr(fileName.find_last_of(".")+1);

      std::transform( ext.begin(), ext.end(), ext.begin(), ::tolower );

    }

    return ext;

  }

  static bool isY4mInputFilename( std::string fileName ) {  return ( "y4m" == getFileExtension(fileName) ); }

  static bool isY4mHeaderAvailable( std::string fileName )

  {

    if( fileName == "-" ) return false;

    std::fstream cfHandle;

    cfHandle.open( fileName, std::ios::binary | std::ios::in );

    if( cfHandle.fail() ) return false;

    char line[10] = {0};

    std::streamsize headerlinesize = cfHandle.readsome( line, 10 );

    cfHandle.close();

    if( headerlinesize && memcmp( line, "YUV4MPEG2", 9 ) == 0 ) return true;

    return false;

  }

  static int parseY4mHeader( const std::string &fileName, vvenc_config& cfg, vvencChromaFormat& inputFileChromaFormat )

  {

    std::fstream cfHandle;

    if( fileName == "-" )

    {

  #if defined (_WIN32) || defined (WIN32) || defined (_WIN64) || defined (WIN64)

      if( _setmode( _fileno( stdin ), _O_BINARY ) == -1 )

      {

        return -1;

      }

  #endif

    }

    else

    {

      cfHandle.open( fileName, std::ios::binary | std::ios::in );

      if( cfHandle.fail() )

      {

        return -1;

      }

    }

    std::istream& inStream = ( fileName == "-" ) ? std::cin : cfHandle;

    // y4m header syntax example

    // YUV4MPEG2 W1920 H1080 F50:1 Ip A128:117 C420p10

    // init y4m defaults (if not given in header)

    cfg.m_inputBitDepth[0]  = 8;

    inputFileChromaFormat = VVENC_CHROMA_420;

    std::string headerline;

    getline(inStream, headerline);

    if( headerline.empty() ){ return -1; }

    std::transform( headerline.begin(), headerline.end(), headerline.begin(), ::toupper );

    std::regex reg("\\s+"); // tokenize at spaces

    std::sregex_token_iterator iter(headerline.begin(), headerline.end(), reg, -1);

    std::sregex_token_iterator end;

    std::vector<std::string> vec(iter, end);

    bool valid=false;

    int  infosFound = 0;

    for (auto &p : vec)

    {

      if( p == "YUV4MPEG2" ) // read file signature

      { valid = true; }

      else if( p[0] == 'W' ) // width

      {

        cfg.m_SourceWidth = atoi( p.substr( 1 ).c_str());

        infosFound++;

      }

      else if( p[0] == 'H' ) // height

      {

        cfg.m_SourceHeight = atoi( p.substr( 1 ).c_str());

        infosFound++;

      }

      else if( p[0] == 'F' )  // framerate,scale

      {

        size_t sep = p.find(":");

        if( sep == std::string::npos ) return -1;

        cfg.m_FrameRate  = atoi( p.substr( 1, sep-1 ).c_str());

        cfg.m_FrameScale = atoi( p.substr( sep+1 ).c_str());

        infosFound++;

      }

      else if( p[0] == 'A' ) // aspect ratio

      {

        size_t sep = p.find(":");

        if( sep == std::string::npos ) return -1;

        cfg.m_sarWidth  = atoi( p.substr( 1, sep-1 ).c_str());

        cfg.m_sarHeight = atoi( p.substr( sep+1 ).c_str());

      }

      else if( p[0] == 'C' ) // colorspace ( e.g. C420p10)

      {

        std::vector<std::string> ignores = {"JPEG", "MPEG2", "PALVD" }; // ignore some special cases

        for( auto &i : ignores )

        {

          auto n = p.find( i );

          if (n != std::string::npos) p.erase(n, i.length()); // remove from param string (e.g. 420PALVD)

        }

        size_t sep = p.find("P");

        std::string chromatype;

        if( sep != std::string::npos )

        {

          chromatype = ( p.substr( 1, sep-1 ).c_str());

          cfg.m_inputBitDepth[0] = atoi( p.substr( sep+1 ).c_str());

        }

        else

        {

          sep = p.find("CMONO");

          if( sep != std::string::npos )

          {

            chromatype = "400";

            if( p == "CMONO") cfg.m_inputBitDepth[0] = 8;

            else cfg.m_inputBitDepth[0] = atoi( p.substr( sep+5 ).c_str()); // e.g. mono10

          }

          else

          {

            chromatype = ( p.substr( 1 ).c_str());

            cfg.m_inputBitDepth[0] = 8;

          }

        }

        if( chromatype == "400" )      { inputFileChromaFormat =  VVENC_CHROMA_400; }

        else if( chromatype == "420" ) { inputFileChromaFormat =  VVENC_CHROMA_420; }

        else if( chromatype == "422" ) { inputFileChromaFormat =  VVENC_CHROMA_422; }

        else if( chromatype == "444" ) { inputFileChromaFormat =  VVENC_CHROMA_444; }

        else { return -1; } // unsupported chroma foramt}

      }

      else if( p[0] == 'I' ) // interlaced format (ignore it, because we cannot set it in any params

      {}

      else if( p[0] == 'X' ) // ignore comments

      {}

    }

    if( fileName != "-" )

    {

      cfHandle.close();

    }

    if ( infosFound < 3 )

    {

      valid = false;  

    }

    if( !valid ) return -1;

    return (int)headerline.length()+1;

  }

  static bool checkInputFile( std::string fileName, std::string& rcErrText )

  {

    if( fileName == "-" ) return true;

    std::stringstream css;

    std::fstream cfHandle;

    cfHandle.open( fileName, std::ios::binary | std::ios::in );

    if( cfHandle.fail() )

    {

      css <<"cannot open input file " << fileName;

      rcErrText = css.str();

      return false;

    }

    cfHandle.seekg( 0, std::ios::end );

    if ( 0 >= cfHandle.tellg() )

    {

      css <<"cannot determine valid input file size of file" << fileName;

      rcErrText = css.str();

      return false;

    }

    cfHandle.close();

    std::string ext = getFileExtension(fileName);

    std::vector<std::string> unsupportedList { "mp4", "mkv", "ts", "mpeg", "avi" } ;

    for (auto &e : unsupportedList)

    {

      if( e == ext )

      {

        css <<"unsupported input file format " << e << " detected. support only for RAW/YUV/Y4M input files.\n";

        rcErrText = css.str();

        return false;

      }

    }

    return true;

  }

  static bool checkBitstreamFile( std::string fileName, std::string& rcErrText )

  {

    if( fileName == "-" ) return true;

    std::stringstream css;

    std::string ext = getFileExtension(fileName);

    std::vector<std::string> unsupportedList { "mp4", "mkv", "ts", "mpeg", "avi" } ;

    for (auto &e : unsupportedList)

    {

      if( e == ext )

      {

        css <<"unsupported output file format detected. no support for " << e << " container. RAW ES (e.g. *.vvc, *.266) support only.\n" << fileName;

        rcErrText = css.str();

        return false;

      }

    }

    return true;

  }

  static bool verifyYuvPlane( vvencYUVPlane& yuvPlane, const int bitDepth )

  {

    const int stride = yuvPlane.stride;

    const int width  = yuvPlane.width;

    const int height = yuvPlane.height;

    LPel* dst        = yuvPlane.ptr;

    const LPel mask = ~( ( 1 << bitDepth ) - 1 );

    for ( int y = 0; y < height; y++, dst += stride )

    {

      for ( int x = 0; x < width; x++ )

      {

        if ( ( dst[ x ] & mask ) != 0 )

        {

          return false;

        }

      }

    }

    return true;

  }

  static bool readYuvPlane( std::istream&     fd,

                     vvencYUVPlane&           yuvPlane,

                     bool                     is16bit,

                     int                      fileBitDepth,

                     int                      packedYUVInput,

                     const int&               compID,

                     const vvencChromaFormat& inputChFmt,

                     const vvencChromaFormat& internChFmt

                   )

  {

    const int csx_file = ( (compID == 0) || (inputChFmt==VVENC_CHROMA_444) ) ? 0 : 1;

    const int csy_file = ( (compID == 0) || (inputChFmt!=VVENC_CHROMA_420) ) ? 0 : 1;

    const int csx_dest = ( (compID == 0) || (internChFmt==VVENC_CHROMA_444) ) ? 0 : 1;

    const int csy_dest = ( (compID == 0) || (internChFmt!=VVENC_CHROMA_420) ) ? 0 : 1;

    const int stride  = yuvPlane.stride;

    const int width   = yuvPlane.width;

    const int height  = yuvPlane.height;

    LPel* dst         = yuvPlane.ptr;

    const int fileStride = ( ( width  << csx_dest ) * ( is16bit ? 2 : 1 ) ) >> csx_file;

    const int fileHeight = ( ( height << csy_dest )                       ) >> csy_file;

    if ( compID != 0 && ( inputChFmt == VVENC_CHROMA_400 || internChFmt == VVENC_CHROMA_400 ) )

    {

      if ( internChFmt != VVENC_CHROMA_400 )

      {

        // set chrominance data to mid-range: (1<<(fileBitDepth-1))

        const LPel val = 1 << ( fileBitDepth - 1 );

        for (int y = 0; y < height; y++, dst+= stride)

        {

          for (int x = 0; x < width; x++)

          {

            dst[x] = val;

          }

        }

      }

      if ( inputChFmt != VVENC_CHROMA_400 )

      {

        fd.seekg( fileHeight * fileStride, std::ios::cur );

        if ( fd.eof() || fd.fail() )

        {

          return false;

        }

      }

    }

    else if ( packedYUVInput )

    {

      const int fileStride_packed = ( width * 5 / 4 );

      std::vector<uint8_t> bufVec( fileStride_packed );

      for( int y = 0; y < height; y++ )

      {

        uint8_t *buf = &( bufVec[0] );

        // read a new line

        fd.read( reinterpret_cast<char*>( buf ), fileStride_packed );

        if ( fd.eof() || fd.fail() )

        {

          return false;

        }

        for ( int x = 0; x < width; x += 4 )

        {

          int64_t iTemp = 0;

          unsigned char* pucTemp = reinterpret_cast< unsigned char* >( &iTemp );

          pucTemp[0] = buf[0];

          pucTemp[1] = buf[1];

          pucTemp[2] = buf[2];

          pucTemp[3] = buf[3];

          pucTemp[4] = buf[4];

          dst[x+0] = 0x03ff & (iTemp>>0);

          dst[x+1] = 0x03ff & (iTemp>>10);

          dst[x+2] = 0x03ff & (iTemp>>20);

          dst[x+3] = 0x03ff & (iTemp>>30);

          buf += 5;

        }

        dst += stride;

      }

    }

    else

    {

      std::vector<uint8_t> bufVec( fileStride );

      uint8_t *buf = &( bufVec[0] );

      const unsigned mask_y_file = ( 1 << csy_file ) - 1;

      const unsigned mask_y_dest = ( 1 << csy_dest ) - 1;

      for( int y444 = 0; y444 < ( height << csy_dest ); y444++ )

      {

        if ( ( y444 & mask_y_file ) == 0 )

        {

          // read a new line

          fd.read( reinterpret_cast<char*>( buf ), fileStride );

          if ( fd.eof() || fd.fail() )

          {

            return false;

          }

        }

        if ( ( y444 & mask_y_dest ) == 0 )

        {

          // process current destination line

          if ( csx_file < csx_dest )

          {

            // eg file is 444, dest is 422.

            const int sx = csx_dest - csx_file;

            if ( ! is16bit )

            {

              for ( int x = 0; x < width; x++ )

              {

                dst[ x ] = buf[ x << sx ];

              }

            }

            else

            {

              for ( int x = 0; x < width; x++ )

              {

                dst[ x ] = LPel( buf[ ( x << sx ) * 2 + 0 ] ) | ( LPel ( buf[ ( x << sx ) * 2 + 1 ] ) << 8 );

              }

            }

          }

          else

          {

            // eg file is 422, dest is 444.

            const int sx = csx_file - csx_dest;

            if ( ! is16bit )

            {

              for ( int x = 0; x < width; x++ )

              {

                dst[ x ] = buf[ x >> sx ];

              }

            }

            else

            {

              for ( int x = 0; x < width; x++ )

              {

                dst[ x ] = LPel( buf[ ( x >> sx ) * 2 + 0 ] ) | ( LPel( buf[ ( x >> sx ) * 2 + 1 ] ) << 8 );

              }

            }

          }

          dst += stride;

        }

      }

    }

    return true;

  }

  static bool writeYuvPlane( std::ostream&     fd,

                      const vvencYUVPlane&     yuvPlane,

                      bool                     is16bit,

                      int                      fileBitDepth,

                      int                      packedYUVOutputMode,

                      const int&               compID,

                      const vvencChromaFormat& internChFmt,

                      const vvencChromaFormat& outputChFmt

                    )

  {

    const int stride = yuvPlane.stride;

    const int width  = yuvPlane.width;

    const int height = yuvPlane.height;

    const LPel* src  = yuvPlane.ptr;

    const int csx_file = ( (compID == 0) || (outputChFmt==VVENC_CHROMA_444) ) ? 0 : 1;

    const int csy_file = ( (compID == 0) || (outputChFmt!=VVENC_CHROMA_420) ) ? 0 : 1;

    const int csx_src  = ( (compID == 0) || (internChFmt==VVENC_CHROMA_444) ) ? 0 : 1;

    const int csy_src  = ( (compID == 0) || (internChFmt!=VVENC_CHROMA_420) ) ? 0 : 1;

    const int  fileWidth  = ( width  << csx_src ) >> csx_file;

    const int  fileHeight = ( height << csy_src ) >> csy_file;

    const bool writePYUV  = ( packedYUVOutputMode > 0 ) && ( fileBitDepth == 10 || fileBitDepth == 12 ) && ( ( fileWidth & ( 1 + ( fileBitDepth & 3 ) ) ) == 0 );

    const int  fileStride = writePYUV ? ( ( width << csx_src ) * fileBitDepth ) >> ( csx_file + 3 ) : ( ( width << csx_src ) * ( is16bit ? 2 : 1 ) ) >> csx_file;

    std::vector<uint8_t> bufVec( fileStride );

    uint8_t *buf = &( bufVec[ 0 ] );

    if ( writePYUV )

    {

      const unsigned mask_y_file = (1 << csy_file) - 1;

      const unsigned mask_y_src  = (1 << csy_src ) - 1;

      const int      widthS_file = fileWidth >> (fileBitDepth == 12 ? 1 : 2);

      for ( int y444 = 0; y444 < ( height << csy_src ); y444++)

      {

        if ( ( y444 & mask_y_file ) == 0 )  // write a new line to file

        {

          if ( csx_file < csx_src )

          {

            // eg file is 444, source is 422.

            const int sx = csx_src - csx_file;

            if (fileBitDepth == 10)  // write 4 values into 5 bytes

            {

              for ( int x = 0; x < widthS_file; x++)

              {

                const unsigned src0 = src[(4*x  ) >> sx];

                const unsigned src1 = src[(4*x+1) >> sx];

                const unsigned src2 = src[(4*x+2) >> sx];

                const unsigned src3 = src[(4*x+3) >> sx];

                buf[5*x  ] = ((src0     ) & 0xff); // src0:76543210

                buf[5*x+1] = ((src1 << 2) & 0xfc) + ((src0 >> 8) & 0x03);

                buf[5*x+2] = ((src2 << 4) & 0xf0) + ((src1 >> 6) & 0x0f);

                buf[5*x+3] = ((src3 << 6) & 0xc0) + ((src2 >> 4) & 0x3f);

                buf[5*x+4] = ((src3 >> 2) & 0xff); // src3:98765432

              }

            }

            else if ( fileBitDepth == 12 ) //...2 values into 3 bytes

            {

              for ( int x = 0; x < widthS_file; x++ )

              {

                const unsigned src0 = src[(2*x  ) >> sx];

                const unsigned src1 = src[(2*x+1) >> sx];

                buf[3*x  ] = ((src0     ) & 0xff); // src0:76543210

                buf[3*x+1] = ((src1 << 4) & 0xf0) + ((src0 >> 8) & 0x0f);

                buf[3*x+2] = ((src1 >> 4) & 0xff); // src1:BA987654

              }

            }

          }

          else

          {

            // eg file is 422, source is 444.

            const int sx = csx_file - csx_src;

            if (fileBitDepth == 10)  // write 4 values into 5 bytes

            {

              for ( int x = 0; x < widthS_file; x++ )

              {

                const unsigned src0 = src[(4*x  ) << sx];

                const unsigned src1 = src[(4*x+1) << sx];

                const unsigned src2 = src[(4*x+2) << sx];

                const unsigned src3 = src[(4*x+3) << sx];

                buf[5*x  ] = ((src0     ) & 0xff); // src0:76543210

                buf[5*x+1] = ((src1 << 2) & 0xfc) + ((src0 >> 8) & 0x03);

                buf[5*x+2] = ((src2 << 4) & 0xf0) + ((src1 >> 6) & 0x0f);

                buf[5*x+3] = ((src3 << 6) & 0xc0) + ((src2 >> 4) & 0x3f);

                buf[5*x+4] = ((src3 >> 2) & 0xff); // src3:98765432

              }

            }

            else if ( fileBitDepth == 12 ) //...2 values into 3 bytes

            {

              for ( int x = 0; x < widthS_file; x++ )

              {

                const unsigned src0 = src[(2*x  ) << sx];

                const unsigned src1 = src[(2*x+1) << sx];

                buf[3*x  ] = ((src0     ) & 0xff); // src0:76543210

                buf[3*x+1] = ((src1 << 4) & 0xf0) + ((src0 >> 8) & 0x0f);

                buf[3*x+2] = ((src1 >> 4) & 0xff); // src1:BA987654

              }

            }

          }

          fd.write( reinterpret_cast<const char*>( buf ), fileStride );

          if ( fd.eof() || fd.fail() )

          {

            return false;

          }

        }

        if ( ( y444 & mask_y_src ) == 0)

        {

          src += stride;

        }

      }

    }

    // !writePYUV

    else if ( compID != 0 && ( outputChFmt == VVENC_CHROMA_400 || internChFmt == VVENC_CHROMA_400 ) )

    {

      if ( outputChFmt != VVENC_CHROMA_400 )

      {

        const LPel value = 1 << ( fileBitDepth - 1 );

        for ( int y = 0; y < fileHeight; y++ )

        {

          if ( ! is16bit )

          {

            uint8_t val( value );

            for ( int x = 0; x < fileWidth; x++ )

            {

              buf[x]=val;

            }

          }

          else

          {

            uint16_t val( value );

            for ( int x = 0; x < fileWidth; x++ )

            {

              buf[2*x  ]= (val>>0) & 0xff;

              buf[2*x+1]= (val>>8) & 0xff;

            }

          }

          fd.write( reinterpret_cast<const char*>( buf ), fileStride );

          if ( fd.eof() || fd.fail() )

          {

            return false;

          }

        }

      }

    }

    else

    {

      const unsigned mask_y_file = (1 << csy_file) - 1;

      const unsigned mask_y_src  = (1 << csy_src ) - 1;

      for ( int y444 = 0; y444 < ( height << csy_src ); y444++ )

      {

        if ( ( y444 & mask_y_file ) == 0 )

        {

          // write a new line

          if ( csx_file < csx_src )

          {

            // eg file is 444, source is 422.

            const int sx = csx_src - csx_file;

            if ( ! is16bit )

            {

              for ( int x = 0; x < fileWidth; x++ )

              {

                buf[x] = (uint8_t)(src[x>>sx]);

              }

            }

            else

            {

              for ( int x = 0; x < fileWidth; x++ )

              {

                buf[2*x  ] = (src[x>>sx]>>0) & 0xff;

                buf[2*x+1] = (src[x>>sx]>>8) & 0xff;

              }

            }

          }

          else

          {

            // eg file is 422, source is 444.

            const int sx = csx_file - csx_src;

            if ( ! is16bit )

            {

              for ( int x = 0; x < fileWidth; x++ )

              {

                buf[x] = (uint8_t)(src[x<<sx]);

              }

            }

            else

            {

              for ( int x = 0; x < fileWidth; x++ )

              {

                buf[2*x  ] = (src[x<<sx]>>0) & 0xff;

                buf[2*x+1] = (src[x<<sx]>>8) & 0xff;

              }

            }

          }

          fd.write( reinterpret_cast<const char*>( buf ), fileStride );

          if ( fd.eof() || fd.fail() )

          {

            return false;

          }

        }

        if ( ( y444 & mask_y_src ) == 0 )

        {

          src += stride;

        }

      }

    }

    return true;

  }

  static void scaleYuvPlane( vvencYUVPlane& yuvPlaneOut, const vvencYUVPlane& yuvPlaneIn, 

                             const int shiftBits, const LPel minVal, const LPel maxVal )

  {

    const int stride = yuvPlaneOut.stride;

    const int width  = yuvPlaneOut.width;

    const int height = yuvPlaneOut.height;

    LPel* dst        = yuvPlaneOut.ptr;

    const LPel* src    = yuvPlaneIn.ptr;

    const int instride = yuvPlaneIn.stride;

    if( 0 == shiftBits )

    {

      return;

    }

    if( shiftBits > 0 )

    {

      for( int y = 0; y < height; y++, dst += stride, src += instride )

      {

        for( int x = 0; x < width; x++)

        {

          dst[x] = src[x] << shiftBits;

        }

      }

    }

    else if ( shiftBits < 0 )

    {

      const int shiftbitsr =- shiftBits;

      const LPel rounding = 1 << ( shiftbitsr-1 );

      for( int y = 0; y < height; y++, dst += stride, src += instride )

      {

        for( int x = 0; x < width; x++)

        {

          LPel val = ( src[ x ] + rounding ) >> shiftbitsr;

          dst[ x ] = std::max<LPel>( minVal, std::min<LPel>( maxVal, val ) );

        }

      }

    }

  }

};

} // namespace apputils

//! \}