/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2013 Medical Physics Department, CHU of Liege,
 * Belgium
 *
 * 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 3 of the
 * License, or (at your option) any later version.
 *
 * In addition, as a special exception, the copyright holders of this
 * program give permission to link the code of its release with the
 * OpenSSL project's "OpenSSL" library (or with modified versions of it
 * that use the same license as the "OpenSSL" library), and distribute
 * the linked executables. You must obey the GNU General Public License
 * in all respects for all of the code used other than "OpenSSL". If you
 * modify file(s) with this exception, you may extend this exception to
 * your version of the file(s), but you are not obligated to do so. If
 * you do not wish to do so, delete this exception statement from your
 * version. If you delete this exception statement from all source files
 * in the program, then also delete it here.
 * 
 * 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, see <http://www.gnu.org/licenses/>.
 **/


#include "Uuid.h"

// http://stackoverflow.com/a/1626302

extern "C"
{
#ifdef WIN32
#include <rpc.h>
#else
#include <uuid/uuid.h>
#endif
}

#include <boost/filesystem.hpp>

namespace Orthanc
{
  namespace Toolbox
  {
    std::string GenerateUuid()
    {
#ifdef WIN32
      UUID uuid;
      UuidCreate ( &uuid );

      unsigned char * str;
      UuidToStringA ( &uuid, &str );

      std::string s( ( char* ) str );

      RpcStringFreeA ( &str );
#else
      uuid_t uuid;
      uuid_generate_random ( uuid );
      char s[37];
      uuid_unparse ( uuid, s );
#endif
      return s;
    }


    bool IsUuid(const std::string& str)
    {
      if (str.size() != 36)
      {
        return false;
      }

      for (size_t i = 0; i < str.length(); i++)
      {
        if (i == 8 || i == 13 || i == 18 || i == 23)
        {
          if (str[i] != '-')
            return false;
        }
        else
        {
          if (!isalnum(str[i]))
            return false;
        }
      }

      return true;
    }


    bool StartsWithUuid(const std::string& str)
    {
      if (str.size() < 36)
      {
        return false;
      }

      if (str.size() == 36)
      {
        return IsUuid(str);
      }

      assert(str.size() > 36);
      if (!isspace(str[36]))
      {
        return false;
      }

      return IsUuid(str.substr(0, 36));
    }


    static std::string CreateTemporaryPath(const char* extension)
    {
#if BOOST_HAS_FILESYSTEM_V3 == 1
      boost::filesystem::path tmpDir = boost::filesystem::temp_directory_path();
#elif defined(__linux__)
      boost::filesystem::path tmpDir("/tmp");
#else
#error Support your platform here
#endif

      // We use UUID to create unique path to temporary files
      std::string filename = "Orthanc-" + Orthanc::Toolbox::GenerateUuid();

      if (extension != NULL)
      {
        filename.append(extension);
      }

      tmpDir /= filename;
      return tmpDir.string();
    }


    TemporaryFile::TemporaryFile()
    {
      path_ = CreateTemporaryPath(NULL);
    }


    TemporaryFile::TemporaryFile(const char* extension)
    {
      path_ = CreateTemporaryPath(extension);
    }


    TemporaryFile::~TemporaryFile()
    {
      boost::filesystem::remove(path_);
    }  
  }
}