%%% -*- Mode: Prolog; -*-

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%
%  $Date: 2010-08-24 15:23:06 +0200 (Tue, 24 Aug 2010) $
%  $Revision: 4672 $
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%  This file is part of ProbLog
%  http://dtai.cs.kuleuven.be/problog
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%  ProbLog was developed at Katholieke Universiteit Leuven
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%  Copyright 2008, 2009, 2010
%  Katholieke Universiteit Leuven
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%  Main authors of this file:
%  Theofrastos Mantadelis, Bernd Gutmann
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%%%%%%%%
% Collected OS depended instructions
%%%%%%%%
:- module(os, [set_problog_path/1,
	       problog_path/1,
	       convert_filename_to_working_path/2,
	       convert_filename_to_problog_path/2,
	       concat_path_with_filename/3,
	       empty_bdd_directory/1,
	       empty_output_directory/1,
	       calc_md5/2]).


% load library modules
:- ensure_loaded(library(system)).

% load our own modules
:- ensure_loaded(flags).

:- dynamic [problog_dir/1, problog_working_path/1].

set_problog_path(Path):-
	retractall(problog_path(_)),
	assert(problog_path(Path)).

convert_filename_to_working_path(File_Name, Path):-
	problog_flag(dir, Dir),
	concat_path_with_filename(Dir, File_Name, Path).

convert_filename_to_problog_path(File_Name, Path):-
	problog_path(Dir),
	concat_path_with_filename(Dir, File_Name, Path).

concat_path_with_filename(Path, File_Name, Result):-
	nonvar(File_Name),
	nonvar(Path),

	% make sure, that there is no path delimiter at the end
	prolog_file_name(Path,Path_Absolute),

	(
	 yap_flag(windows, true)
	->
	 Path_Seperator = '\\';
	 Path_Seperator = '/'
	),

	 atomic_concat([Path_Absolute, Path_Seperator, File_Name], Result).

%========================================================================
%= store the current succes probabilities for training and test examples
%= 
%========================================================================

empty_bdd_directory(Path) :-
	ground(Path),

	concat_path_with_filename(Path,'query_*',Files),	
	atomic_concat(['rm -f ',Files],Command),
	(shell(Command) -> true; true).
%========================================================================
%= store the current succes probabilities for training and test examples
%= 
%========================================================================

empty_output_directory(Path) :-
	ground(Path),

	concat_path_with_filename(Path,'log.dat',F1),
	concat_path_with_filename(Path,'factprobs_*.pl',F2),
	concat_path_with_filename(Path,'predictions_*.pl',F3),
	
	atomic_concat(['rm -f ',F1, ' ', F2, ' ', F3],Command),
	(shell(Command) -> true; true).

%========================================================================
%= Calculate the MD5 checksum of +Filename by calling md5sum
%= in case m5sum is not installed, try md5, otherwise fail
%= +Filename, -MD5
%========================================================================

calc_md5(Filename,MD5):-
	catch(calc_md5_intern(Filename,'md5sum',MD5),_,fail),
	!.
calc_md5(Filename,MD5):-
	catch(calc_md5_intern(Filename,'md5',MD5),_,fail),
	!.
calc_md5(Filename,MD5):-
	throw(md5error(calc_md5(Filename,MD5))).

calc_md5_intern(Filename,Command,MD5) :-
	( file_exists(Filename) -> true ; throw(md5_file(Filename)) ),

	atomic_concat([Command,' "',Filename,'"'],Call),  

	% execute the md5 command
	exec(Call,[null,pipe(S),null],_PID),
	bb_put(calc_md5_temp,End-End),  % use difference list
	bb_put(calc_md5_temp2,0),

	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	(	% read 32 Bytes from stdout of process
		repeat,
		get0(S,C),

		(
		 C== -1
		->
		 (
		  close(S),
		  throw(md5error('premature end of output stream, please check os.yap calc_md5/2'))
		 );
		 true
		),

		bb_get(calc_md5_temp,List-[C|NewEnd]),
		bb_put(calc_md5_temp,List-NewEnd),
		bb_get(calc_md5_temp2,OldLength),
		NewLength is OldLength+1,
		bb_put(calc_md5_temp2,NewLength),
		NewLength=32
	),
	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	!,
	
	close(S),
	bb_delete(calc_md5_temp, FinalList-[]),
	bb_delete(calc_md5_temp2,_),
	atom_codes(MD5,FinalList).