/*===========================================================================*\
 *                                                                           *
 *                               OpenMesh                                    *
 *      Copyright (C) 2001-2012 by Computer Graphics Group, RWTH Aachen      *
 *                           www.openmesh.org                                *
 *                                                                           *
 *---------------------------------------------------------------------------*
 *  This file is part of OpenMesh.                                           *
 *                                                                           *
 *  OpenMesh 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 3 of           *
 *  the License, or (at your option) any later version with the              *
 *  following exceptions:                                                    *
 *                                                                           *
 *  If other files instantiate templates or use macros                       *
 *  or inline functions from this file, or you compile this file and         *
 *  link it with other files to produce an executable, this file does        *
 *  not by itself cause the resulting executable to be covered by the        *
 *  GNU Lesser General Public License. This exception does not however       *
 *  invalidate any other reasons why the executable file might be            *
 *  covered by the GNU Lesser General Public License.                        *
 *                                                                           *
 *  OpenMesh 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 LesserGeneral Public          *
 *  License along with OpenMesh.  If not,                                    *
 *  see <http://www.gnu.org/licenses/>.                                      *
 *                                                                           *
\*===========================================================================*/

/*===========================================================================*\
 *                                                                           *
 *   $Revision: 748 $                                                         *
 *   $Date: 2012-10-15 15:52:32 +0200 (Mo, 15 Okt 2012) $                   *
 *                                                                           *
\*===========================================================================*/


//=============================================================================
//
//  Implements the OpenMesh IOManager singleton
//
//=============================================================================


//== INCLUDES =================================================================


#include <OpenMesh/Core/System/config.h>
#include <OpenMesh/Core/IO/IOManager.hh>


//== NAMESPACES ===============================================================


namespace OpenMesh {
namespace IO {


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


_IOManager_  *__IOManager_instance = 0;


_IOManager_& IOManager()
{

  if (!__IOManager_instance)
    __IOManager_instance = new _IOManager_();

  return *__IOManager_instance;
}


//-----------------------------------------------------------------------------


bool
_IOManager_::
read(const std::string& _filename, BaseImporter& _bi, Options& _opt)
{
  std::set<BaseReader*>::const_iterator it     =  reader_modules_.begin();
  std::set<BaseReader*>::const_iterator it_end =  reader_modules_.end();

  // Try all registered modules
  for(; it != it_end; ++it)
    if ((*it)->can_u_read(_filename))
    {
      _bi.prepare();
      bool ok = (*it)->read(_filename, _bi, _opt);
      _bi.finish();
      return ok;
    }

  // All modules failed to read
  return false;
}


//-----------------------------------------------------------------------------


bool
_IOManager_::
read(std::istream& _is, const std::string& _ext, BaseImporter& _bi, Options& _opt)
{
  std::set<BaseReader*>::const_iterator it     =  reader_modules_.begin();
  std::set<BaseReader*>::const_iterator it_end =  reader_modules_.end();

  // Try all registered modules
  for(; it != it_end; ++it)
    if ((*it)->BaseReader::can_u_read(_ext))  //Use the extension check only (no file existence)
    {
      _bi.prepare();
      bool ok = (*it)->read(_is, _bi, _opt);
      _bi.finish();
      return ok;
    }

  // All modules failed to read
  return false;
}


//-----------------------------------------------------------------------------


bool
_IOManager_::
write(const std::string& _filename, BaseExporter& _be, Options _opt, std::streamsize _precision)
{
  std::set<BaseWriter*>::const_iterator it     = writer_modules_.begin();
  std::set<BaseWriter*>::const_iterator it_end = writer_modules_.end();

  if ( it == it_end )
  {
    omerr() << "[OpenMesh::IO::_IOManager_] No writing modules available!\n";
    return false;
  }

  // Try all registered modules
  for(; it != it_end; ++it)
  {
    if ((*it)->can_u_write(_filename))
    {
      return (*it)->write(_filename, _be, _opt, _precision);
    }
  }

  // All modules failed to save
  return false;
}

//-----------------------------------------------------------------------------


bool
_IOManager_::
write(std::ostream& _os,const std::string &_ext, BaseExporter& _be, Options _opt, std::streamsize _precision)
{
  std::set<BaseWriter*>::const_iterator it     = writer_modules_.begin();
  std::set<BaseWriter*>::const_iterator it_end = writer_modules_.end();

  if ( it == it_end )
  {
    omerr() << "[OpenMesh::IO::_IOManager_] No writing modules available!\n";
    return false;
  }

  // Try all registered modules
  for(; it != it_end; ++it)
  {
    if ((*it)->BaseWriter::can_u_write(_ext)) //Restrict test to the extension check
    {
      return (*it)->write(_os, _be, _opt, _precision);
    }
  }

  // All modules failed to save
  return false;
}

//-----------------------------------------------------------------------------


bool
_IOManager_::
can_read( const std::string& _format ) const
{
  std::set<BaseReader*>::const_iterator it     = reader_modules_.begin();
  std::set<BaseReader*>::const_iterator it_end = reader_modules_.end();
  std::string filename = "dummy." + _format;

  for(; it != it_end; ++it)
    if ((*it)->can_u_read(filename))
      return true;

  return false;
}


//-----------------------------------------------------------------------------


bool
_IOManager_::
can_write( const std::string& _format ) const
{
  std::set<BaseWriter*>::const_iterator it     = writer_modules_.begin();
  std::set<BaseWriter*>::const_iterator it_end = writer_modules_.end();
  std::string filename = "dummy." + _format;

  // Try all registered modules
  for(; it != it_end; ++it)
    if ((*it)->can_u_write(filename))
      return true;

  return false;
}


//-----------------------------------------------------------------------------


const BaseWriter*
_IOManager_::
find_writer(const std::string& _format)
{
  using std::string;

  string::size_type dot = _format.rfind('.');

  string ext;
  if (dot == string::npos)
    ext = _format;
  else
    ext = _format.substr(dot+1,_format.length()-(dot+1));

  std::set<BaseWriter*>::const_iterator it     = writer_modules_.begin();
  std::set<BaseWriter*>::const_iterator it_end = writer_modules_.end();
  std::string filename = "dummy." + ext;

  // Try all registered modules
  for(; it != it_end; ++it)
    if ((*it)->can_u_write(filename))
      return *it;

  return NULL;
}


//-----------------------------------------------------------------------------


void
_IOManager_::
update_read_filters()
{
  std::set<BaseReader*>::const_iterator it     = reader_modules_.begin(),
                                        it_end = reader_modules_.end();
  std::string all = "";
  std::string filters = "";

  for(; it != it_end; ++it)
  {
    // Initialized with space, as a workaround for debug build with clang on mac
    // which crashes if tmp is initialized with an empty string ?!
    std::string tmp = " ";

    filters += (*it)->get_description() + " (";

    std::istringstream iss((*it)->get_extensions());

    while (iss && !iss.eof() && (iss >> tmp) )
    {
     tmp = " *." + tmp; filters += tmp; all += tmp;
    }

    filters += " );;";
  }

  all = "All files ( " + all + " );;";

  read_filters_ = all + filters;
}


//-----------------------------------------------------------------------------


void
_IOManager_::
update_write_filters()
{
  std::set<BaseWriter*>::const_iterator it     = writer_modules_.begin(),
                                        it_end = writer_modules_.end();
  std::string all;
  std::string filters;

  for(; it != it_end; ++it)
  {
    // Initialized with space, as a workaround for debug build with clang on mac
    // which crashes if tmp is initialized with an empty string ?!
    std::string s = " ";

    filters += (*it)->get_description() + " (";

    std::istringstream iss((*it)->get_extensions());
    while (iss && !iss.eof() && (iss >> s))
    { s = " *." + s; filters += s; all += s; }

    filters += " );;";
  }
  all = "All files ( " + all + " );;";

  write_filters_ = all + filters;
}


//=============================================================================
} // namespace IO
} // namespace OpenMesh
//=============================================================================
