/*
   Copyright (C) 2001-2006, William Joseph.
   All Rights Reserved.

   This file is part of GtkRadiant.

   GtkRadiant 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 2 of the License, or
   (at your option) any later version.

   GtkRadiant 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 GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined( INCLUDED_VERSIONLIB_H )
#define INCLUDED_VERSIONLIB_H

#include <cstddef>
#include <string.h>
#include <algorithm>

class Version
{
public:
int major;
int minor;
};

inline bool operator<( const Version& version, const Version& other ){
	return version.major < other.major || ( !( other.major < version.major ) && version.minor < other.minor );
}

template<typename TextOutputStreamType>
TextOutputStreamType& ostream_write( TextOutputStreamType& outputStream, const Version& version ){
	return outputStream << version.major << '.' << version.minor;
}

/// \brief Returns true if \p version (code) is compatible with \p other (data).
inline bool version_compatible( const Version& version, const Version& other ){
	return version.major == other.major // different major-versions are always incompatible
		   && !( version.minor < other.minor ); // data minor-version is incompatible if greater than code minor-version
}

inline int string_range_parse_unsigned_decimal_integer( const char* first, const char* last ){
	int result = 0;
	for (; first != last; ++first )
	{
		result *= 10;
		result += *first - '0';
	}
	return result;
}

inline Version version_parse( const char* versionString ){
	Version version;
	const char* endVersion = versionString + strlen( versionString );

	const char* endMajor = strchr( versionString, '.' );
	if ( endMajor == 0 ) {
		endMajor = endVersion;

		version.minor = 0;
	}
	else
	{
		const char* endMinor = strchr( endMajor + 1, '.' );
		if ( endMinor == 0 ) {
			endMinor = endVersion;
		}
		version.minor = string_range_parse_unsigned_decimal_integer( endMajor + 1, endMinor );
	}
	version.major = string_range_parse_unsigned_decimal_integer( versionString, endMajor );

	return version;
}

#endif
