/*
	grive: an GPL program to sync a local directory with Google Drive
	Copyright (C) 2012  Wan Wai Ho

	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 version 2
	of the License.

	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, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#include "OS.hh"

#include "DateTime.hh"
#include "Exception.hh"

// boost headers
#include <boost/throw_exception.hpp>
#include <boost/exception/errinfo_api_function.hpp>
#include <boost/exception/errinfo_at_line.hpp>
#include <boost/exception/errinfo_errno.hpp>
#include <boost/exception/errinfo_file_name.hpp>
#include <boost/exception/errinfo_file_open_mode.hpp>
#include <boost/exception/info.hpp>

// OS specific headers
#include <errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>

namespace gr { namespace os {

void Stat( const fs::path& filename, DateTime *t, off_t *size, FileType *ft )
{
	Stat( filename.string(), t, size, ft ) ;
}

void Stat( const std::string& filename, DateTime *t, off64_t *size, FileType *ft )
{
	struct stat s = {} ;
	if ( ::stat( filename.c_str(), &s ) != 0 )
	{
		BOOST_THROW_EXCEPTION(
			Error()
				<< boost::errinfo_api_function("stat")
				<< boost::errinfo_errno(errno)
				<< boost::errinfo_file_name(filename)
		) ;
	}
	
	if ( t )
	{
#if defined __APPLE__ && defined __DARWIN_64_BIT_INO_T
		*t = DateTime( s.st_ctimespec.tv_sec, s.st_ctimespec.tv_nsec ) ;
#else
		*t = DateTime( s.st_ctim.tv_sec, s.st_ctim.tv_nsec);
#endif
	}
	if ( size )
		*size = s.st_size;
	if ( ft )
		*ft = S_ISDIR( s.st_mode ) ? FT_DIR : ( S_ISREG( s.st_mode ) ? FT_FILE : FT_UNKNOWN ) ;
}

void SetFileTime( const fs::path& filename, const DateTime& t )
{
	return SetFileTime( filename.string(), t ) ;
}

void SetFileTime( const std::string& filename, const DateTime& t )
{
	struct timeval tvp[2] = { t.Tv(), t.Tv() } ;
	if ( ::utimes( filename.c_str(), tvp ) != 0 )
		BOOST_THROW_EXCEPTION(
			Error()
				<< boost::errinfo_api_function("utimes")
				<< boost::errinfo_errno(errno)
				<< boost::errinfo_file_name(filename)
		) ;
}

void Sleep( unsigned int sec )
{
	struct timespec ts = { sec, 0 } ;
	
	int result = 0 ;
	do
	{
		struct timespec rem ;
		nanosleep( &ts, &rem ) ;
		ts = rem ;
	} while ( result == -1 && errno == EINTR ) ;
}

} } // end of namespaces