// Copyright (C) 2007-2019  CEA/DEN, EDF R&D, OPEN CASCADE
//
// Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
//
// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//

#include "MED_Factory.hxx"
#include "MED_Utilities.hxx"
#include "MED_Wrapper.hxx"

#include <Basics_Utils.hxx>

#include <stdio.h>
#include <errno.h>
#include <sstream>
#include <fstream>

#include <med.h>
extern "C"
{
#ifndef WIN32
  #include <unistd.h>
#endif
}
#include <utilities.h>

#ifdef WIN32
#include <windows.h>
#endif

// -------------------------------------------------------------------------------------------------------------------
// --- MED file compatibility: write using a lower major version implies append on an empty file of the target version

#define MED_MAJOR_EXPECTED 4
#define MED_MINOR_EXPECTED 0
#if MED_MAJOR_NUM != MED_MAJOR_EXPECTED
  #error "MED major version does not correspond to the expected version, fix the minor and major compatibility values in CheckCompatibility method (MED_VERSIONS_APPEND_COMPATIBLE) and set the correct expected version"
#endif
#if MED_MINOR_NUM < MED_MINOR_EXPECTED
  #error "MED minor version does not correspond to the expected version, fix the minor and major compatibility values in CheckCompatibility method (MED_VERSIONS_APPEND_COMPATIBLE) and set the correct expected version"
#endif
#define MED_VERSIONS_APPEND_COMPATIBLE {40, 32, 33} // --- 10*major + minor (the 3rd digit, release, is not used here,
                                                    //                       med uses always the latest available)
                                                    // --- The first in the list should be the default: current version
// --- empty med file content for the different MED versions with a different major.
//     ==> correct accordingly CreateEmptyMEDFile method below!
#define EMPTY_FILE_32 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/* --- bytes hexa representation of MED file built in Python
f= open('vide_321.med', 'rb')
data=f.read()
ba=bytearray(data)
a=""
for i in ba:
  a+=hex(i)
  a+=','
print a
*/

//! internal use: fileName and version must be checked before call
bool CreateEmptyMEDFile(const std::string& fileName, int version)
{
  MESSAGE("create an empty med file of the right version, for append " << version);
  static const unsigned char empty_32[] = EMPTY_FILE_32;
  static const unsigned char empty_33[] = EMPTY_FILE_33;
#ifdef WIN32
#ifdef UNICODE
  std::wstring aFilename = Kernel_Utils::utf8_decode_s(fileName);
#else
  std::wstring aFilename = fileName;
#endif
  std::ofstream ofs(aFilename, std::ios::binary);
#else
  std::ofstream ofs(fileName);
#endif
  if (version == 32)
    ofs.write(reinterpret_cast<const char *>(empty_32),sizeof(empty_32));
  else if (version == 33)
    ofs.write(reinterpret_cast<const char *>(empty_33),sizeof(empty_33));
  ofs.flush();
  ofs.close();
  return true;
}
// -------------------------------------------------------------------------------------------------------------------

namespace MED
{
  bool exists(const std::string& fileName)
  {
#ifdef WIN32
#ifdef UNICODE
    int size_needed = MultiByteToWideChar(CP_UTF8, 0, fileName.c_str(), strlen(fileName.c_str()), NULL, 0);
    wchar_t* path = new wchar_t[size_needed + 1];
    MultiByteToWideChar(CP_UTF8, 0, fileName.c_str(), strlen(fileName.c_str()), path, size_needed);
    path[size_needed] = '\0';
#else
    cosnt char* path = xmlPath.c_str();
#endif
    bool res = (GetFileAttributes(path) != INVALID_FILE_ATTRIBUTES);
#ifdef UNICODE
    delete path;
#endif
    return res;
#else
    return (access(fileName.c_str(), F_OK) == 0);
#endif
  }

  /*!
   *  Return the list of med versions compatibles for write/append,
   *  encoded in 10*major+minor (for instance, code for med 3.2.1 is 32)
   */
  std::vector<int> GetMEDVersionsAppendCompatible()
  {
    int mvok[] = MED_VERSIONS_APPEND_COMPATIBLE;
    std::vector<int> MEDVersionsOK(mvok, mvok + sizeof(mvok)/sizeof(int));
    return MEDVersionsOK;
  }

  /*!
   *  \brief: Check read or write(append) Compatibility of a med file
   *  \param [in] : fileName - the file to read or to append to
   *  \param [in] : isforAppend - when true, check if the med file version is OK to append a mesh,
   *                              when false, check if the med file is readable.
   */
  bool CheckCompatibility(const std::string& fileName, bool isForAppend)
  {
    bool ok = false;
    int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
    // check that file is accessible
    if ( exists(fileName) ) {
      // check HDF5 && MED compatibility
      med_bool hdfok, medok;
      med_err r0 = MEDfileCompatibility(fileName.c_str(), &hdfok, &medok);
      MESSAGE(r0 << " " << hdfok << " " << medok);
      if ( r0==0 && hdfok && medok ) {
        med_idt aFid = MEDfileOpen(fileName.c_str(), MED_ACC_RDONLY);
        if (aFid >= 0) {
          med_int major, minor, release;
          med_err ret = MEDfileNumVersionRd(aFid, &major, &minor, &release);
          MESSAGE(ret << " " << major << "." << minor << "." << release);
          if (ret >= 0) {
            bool isReadOnly = !isForAppend;
            if (isReadOnly)
              ok = true;
            else {
              int medVersion = 10*major + minor;
              for (size_t ii=0; ii < sizeof(medVersionsOK)/sizeof(int); ii++)
                if (medVersionsOK[ii] == medVersion) {
                  ok =true;
                  break;
                }
            }
          }
        }
        MEDfileClose(aFid);
      }
    }
    return ok;
  }

  bool GetMEDVersion(const std::string& fileName, int& major, int& minor, int& release)
  {
    bool ok = false;
    major = minor = release = 0;
    med_idt aFid = MEDfileOpen(fileName.c_str(), MED_ACC_RDONLY);
    if (aFid >= 0) {
      med_int _major, _minor, _release;
      med_err ret = MEDfileNumVersionRd(aFid, &_major, &_minor, &_release);
      if (ret == 0) {
        major = _major;
        minor = _minor;
        release = _release;
        ok = true;
      }
      MEDfileClose(aFid);
    }
    return ok;
  }

  std::string GetMEDVersion(const std::string& fileName)
  {
    std::string version;
    int major, minor, release;
    if (GetMEDVersion(fileName, major, minor, release)) {
      std::ostringstream os;
      os << major << "." << minor << "." << release;
      version = os.str();
    }
    return version;
  }

  PWrapper CrWrapperR(const std::string& fileName)
  {
    if (!CheckCompatibility(fileName)) {
      EXCEPTION(std::runtime_error, "Cannot open file '"<<fileName<<"'.");
    }
    return new MED::TWrapper(fileName, false);
  }

  PWrapper CrWrapperW(const std::string& fileName, int theVersion)
  {
    bool isCreated = false;
    if (!CheckCompatibility(fileName, true))
    {
      remove(fileName.c_str());
      isCreated = true;
    }
    int minor = -1;
    if (isCreated)
    {
      med_int wantedMajor = MED_MAJOR_NUM;
      med_int wantedMinor = MED_MINOR_NUM;
      if (theVersion > 0)
      {
        wantedMajor = theVersion/10;
        wantedMinor = theVersion%10;
      }
      if (wantedMajor == MED_MAJOR_NUM) // the med file will be actually created
      {
        if (wantedMinor < MED_MINOR_NUM)
          minor = wantedMinor;
      }
      else                              // an empty existing med file of the right version will be used for append
      {
        int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
        bool isVersionOK = false;
        for (size_t ii=0; ii < sizeof(medVersionsOK)/sizeof(int); ii++)
          if (medVersionsOK[ii] == theVersion)
          {
            isVersionOK =true;
            break;
          }
        if (isVersionOK)              // copy an empty existing med file of the right version, for append
          CreateEmptyMEDFile(fileName, theVersion);
      }
    }
    return new MED::TWrapper(fileName, true, minor);
  }
}