/**
 * Copyright (C) 2002 Bart Vanhauwaert
 *
 * Permission to use, copy, modify, distribute and sell this software
 * for any purpose is hereby granted without fee. This license
 * includes (but is not limited to) standalone compilation or as part
 * of a larger project.
 *
 * This software is provided "as is" without express or implied warranty.
 *
 * For a full statement on warranty and terms and conditions for
 * copying, distribution and modification, please see the comment block
 * at the end of this file.
 *
 * Version 1
 *
 */

#ifndef OSLINK_OSDIR_HEADER_H_
#define OSLINK_OSDIR_HEADER_H_

#if defined(unix) || defined(__unix) || defined(__unix__)
#define OSLINK_OSDIR_POSIX
#elif defined(_WIN32)
#define OSLINK_OSDIR_WINDOWS
#else
#define OSLINK_OSDIR_NOTSUPPORTED
#endif

#include <string>

#if defined(OSLINK_OSDIR_NOTSUPPORTED)

namespace OS
{
  class Directory
  {
    public:
      Directory(const std::string&) { }
      bool open(const std::string&) {};
      void close() {};

      operator void*() const { return (void*)0; }
      std::string next() { return ""; }
  };
}

#elif defined(OSLINK_OSDIR_POSIX)

#include <sys/types.h>
#include <dirent.h>

namespace OS
{
  class Directory
  {
    public:
      Directory(const std::string& directoryName = "")
          : willfail(false)
      {
        this->handle = NULL;
        this->willfail = true;
        this->open(directoryName);
      }

      ~Directory()
      {
        this->close();
      }

      bool open(const std::string& directoryName)
      {
        if (this->handle != NULL)
          this->close();
        this->handle = opendir(directoryName.c_str());
        if (!handle)
          willfail = true;
        else
        {
          willfail = false;
          dirent* entry = readdir(handle);
          if (entry)
            current = entry->d_name;
          else
            willfail = true;
        }
      }

      void close()
      {
        if (this->handle != NULL)
          closedir(handle);
        this->handle = NULL;
        this->willfail = true;
        this->current = "";
      }

      operator void*() const
      {
        return willfail ? (void*)0:(void*)(-1);
      }

      std::string next()
      {
        std::string prev(current);
        dirent* entry = readdir(handle);
        if (entry)
          current = entry->d_name;
        else
          willfail = true;
        return prev;
      }

    private:
      DIR* handle;
      bool willfail;
      std::string current;
  };
}

#elif defined(OSLINK_OSDIR_WINDOWS)

#ifdef DATADIR
#undef DATADIR
#endif

#include <windows.h>
#include <winbase.h>

namespace OS
{
  class Directory
  {
    public:
      Directory(const std::string& directoryName = "")
          : handle(INVALID_HANDLE_VALUE), willfail(true)
      {
        this->open(directoryName);
      }

      ~Directory()
      {
	this->close();
      }

      bool open(const std::string& directoryName)
      {
        if (handle != INVALID_HANDLE_VALUE)
          this->close();

        // First check the attributes trying to access a non-Directory with
        // FindFirstFile takes ages
        DWORD attrs = GetFileAttributes(directoryName.c_str());
        if ( (attrs == 0xFFFFFFFF) || ((attrs && FILE_ATTRIBUTE_DIRECTORY) == 0) )
        {
          willfail = true;
          return false;
        }
        std::string Full(directoryName);
        // Circumvent a problem in FindFirstFile with c:\\* as parameter
        if ( (Full.length() > 0) && (Full[Full.length()-1] != '\\') )
          Full += "\\";
        WIN32_FIND_DATA entry;
        handle = FindFirstFile( (Full+"*").c_str(), &entry);
        if (handle == INVALID_HANDLE_VALUE)
	  {
	    willfail = true;
	    return false;
	  }
        else
	  {
	    willfail = false;
	    current = entry.cFileName;
	    return true;
	  }
      }

      void close()
      {
        if (handle != INVALID_HANDLE_VALUE)
          FindClose(handle);
        this->willfail = true;
      }

      operator void*() const
      {
        return willfail ? (void*)0:(void*)(-1);
      }

      std::string next()
      {
        std::string prev = current;
        WIN32_FIND_DATA entry;
        int ok = FindNextFile(handle, &entry);
        if (!ok)
          willfail = true;
        else
          current = entry.cFileName;
        return current;
      }


    private:
      HANDLE    handle;
      bool      willfail;
      std::string current;
  };
}


#endif

#endif

/**
 *
 * The "library", above, refers to the collection of software functions
 * and/or data contained in this file, prepared so as to be conveniently
 * compiled and linked with application programs (which use some of those
 * functions and data) to form executables.
 *
 *                             NO WARRANTY
 *
 * 1. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
 * WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
 * EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
 * OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
 * KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
 * LIBRARY IS WITH YOU.  SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
 *
 * 2. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
 * WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
 * AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
 * FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
 * CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
 * LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
 * RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
 * FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
 * SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * END OF TERMS AND CONDITIONS
 *
 */