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# The LON-CAPA option response handler
#
# Option list style responses
#
# YEAR=2001
# 1/19,2/7,2/19,2/21,2/22,3/1,5/4,5/21,5/31,6/1,6/2,6/5,6/11 Guy Albertelli
# 6/12,6/16,6/26,6/27,7/18 Guy Albertelli
# 8/6 Scott Harrison

package Apache::optionresponse;
use strict;
use Apache::response;

# ======================================================================= BEGIN
sub BEGIN {
  &Apache::lonxml::register('Apache::optionresponse',('optionresponse'));
}

# ================================ Start option response (return scalar string)
sub start_optionresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    my $result = '';
    #when in a radiobutton response use these
    &Apache::lonxml::register('Apache::optionresponse',('foilgroup','foil',
							'conceptgroup'));
    push (@Apache::lonxml::namespace,'optionresponse');
    my $id = &Apache::response::start_response($parstack,$safeeval);
    if ($target eq 'edit') {
	$result .= &Apache::edit::start_table($token).
	           "<tr><td>Multiple Option Response Question</td><td>Delete:".
		   &Apache::edit::deletelist($target,$token).
		   "</td><td>&nbsp;</td></tr><tr><td colspan=\"3\">\n";
	$result .= &Apache::edit::text_arg('Max Number Of Foils:','max',
					   $token,'4')."</td></tr>";
	$result .= "<tr><td colspan=\"3\">\n";
    }
    if ($target eq 'modified') {
	my $constructtag = &Apache::edit::get_new_args($token,$parstack,
						       $safeeval,'max');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    }
    return $result;
}

# ================================== End option response (return scalar string)
sub end_optionresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    &Apache::response::end_response;
    pop @Apache::lonxml::namespace;
    my $result;
    if ($target eq 'edit') { $result = &Apache::edit::end_table(); }
    return $result;
}

# ===================================== Start foil group (return scalar string)
%Apache::response::foilgroup = {};
sub start_foilgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    my $result = '';
    %Apache::response::foilgroup = {};
    $Apache::optionresponse::conceptgroup = 0;
    &Apache::response::setrandomnumber();
    if ($target eq 'edit') {
	my $optionlist = "<option></option>\n";
	my $option;
	my @opt;
	eval '@opt ='.
	    &Apache::lonxml::get_param('options',$parstack,$safeeval);
	my $count = 1;
	foreach $option (@opt) {
	    $optionlist .= "<option value=\"$count\">$option</option>\n";
	    $count++;
	}
	my $insertlist = &Apache::edit::insertlist($target,$token);
	$result .= &Apache::edit::start_table($token);
	$result .= (<<ENDTABLE);
     <tr><td>Select Options</td>
        <td>
	  Add new Option: <input type="text" name="$Apache::lonxml::curdepth.options" />
        </td>
        <td>Delete an Option:
	  <select name="$Apache::lonxml::curdepth.deleteopt">$optionlist</select>
        </td>
     </tr>
     <tr><td colspan="3">$insertlist<br />
ENDTABLE
    }
    if ($target eq 'modified') {
	my @options;
	my $optchanged=0;
	eval '@options ='.
	    &Apache::lonxml::get_param('options',$parstack,$safeeval);
	if ($ENV{"form.$Apache::lonxml::curdepth.deleteopt"}) {
	    my $delopt=$ENV{"form.$Apache::lonxml::curdepth.deleteopt"};
	    &Apache::lonxml::debug("Deleting :$delopt:");
	    splice(@options,$delopt-1,1);
	    $optchanged = 1;
	}
	if ($ENV{"form.$Apache::lonxml::curdepth.options"}) {
	    my $newopt = $ENV{"form.$Apache::lonxml::curdepth.options"};
	    if ($options[0]) {
		push(@options,$newopt);
	    } else {
		$options[0] = $newopt;
	    }
	    $optchanged = 1;
	}
	if ($optchanged) {
	    $result = "<foilgroup options=\"(";
	    foreach my $option (@options) {
		$option =~ s/\'/\\\'/;
		&Apache::lonxml::debug("adding option :$option:");
		$result .= "'".$option."',";
	    }
	    chop $result;
	    $result .= ')">';
	} # else nothing changed so just use the default mechanism
    }
    return $result;
}

# ======================================= End foil group (return scalar string)
sub end_foilgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    my $result;
    if ($target eq 'grade' || $target eq 'web') {
	my $name;
	my ($count,$max) = &getfoilcounts($parstack,$safeeval);
	if ($count>$max) { $count = $max } 
	&Apache::lonxml::debug("Count is $count from $max");
	my @opt;
	eval '@opt ='.
	    &Apache::lonxml::get_param('options',$parstack,$safeeval);
	&Apache::lonxml::debug("Options are $#opt");
	if ($target eq 'web') {
	    $result=&displayfoils($count,@opt);
	} elsif ( $target eq 'grade') {
	    if ( defined $ENV{'form.submitted'}) {
		my @whichopt = &whichfoils($count);
		my $temp=1;my $name;
		my $allresponse;
		my $right=0;
		my $wrong=0;
		my $ignored=0;
		foreach $name (@whichopt) {
		    my $response = $ENV{'form.HWVAL_'.
					$Apache::inputtags::response['-1'].
					":$temp"};
		    $allresponse .= "$response:";
		    if ( $response =~ /[^\s]/) {
			&Apache::lonxml::debug("submitted a $response".
					       "<br />\n");
			my $value = $Apache::response::foilgroup{$name.
								     '.value'};
			if ($value eq $response) {$right++;} else {$wrong++;}
		    } else {
			$ignored++;
		    }
		    $temp++;
		}
		my $id = $Apache::inputtags::response['-1'];
		$Apache::lonhomework::results{"resource.".
 	            $Apache::inputtags::part.".$id.submission"} = $allresponse;
		&Apache::lonxml::debug("Got $right right and $wrong wrong, ".
				       "and $ignored were ignored");
		if ($wrong==0 && $ignored==0) {
		    $Apache::lonhomework::results{"resource.".
				   $Apache::inputtags::part.".$id.awarddetail"}
 		                                                 = 'EXACT_ANS';
		} else {
		    $Apache::lonhomework::results{"resource.".
				   $Apache::inputtags::part.".$id.awarddetail"}
		                                                 = 'INCORRECT';
		}
	    }
	}
    }
    if ($target eq 'edit') {
	$result .= &Apache::edit::end_table();
    }
    return $result;
}

# ==================================== Get foil counts (return 2 element array)
sub getfoilcounts {
    my ($parstack,$safeeval) = @_;
    my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,'-2');
    # +1 since instructors will count from 1
    my $count = $#{ $Apache::response::foilgroup{'names'} }+1;
    return ($count,$max);
}

# =============================================== Which foils (return an array)
sub whichfoils {
    my ($max)=@_;
    my @names = @{ $Apache::response::foilgroup{'names'} };
    my @whichopt =();
    while ((($#whichopt+1) < $max) && ($#names > -1)) {
	&Apache::lonxml::debug("Have $#whichopt max is $max");
	my $aopt=int(rand($#names+1));
	&Apache::lonxml::debug("From $#whichopt $max $#names elms, picking ".
			       $aopt);
	$aopt=splice(@names,$aopt,1);
	&Apache::lonxml::debug("Picked $aopt");
	push (@whichopt,$aopt);
    }
    return @whichopt;
}

# ======================================== Display foils (return scalar string)
sub displayfoils {
    my ($max,@opt) = @_;
    my @names = @{ $Apache::response::foilgroup{'names'} };
    my @truelist;
    my @falselist;
    my $result;
    my $name;
    my @whichopt = &whichfoils($max);
    my $optionlist = "<option></option>\n";
    my $option;
    foreach $option (@opt) {
	$optionlist .= "<option>$option</option>\n";
    }
    if ($Apache::lonhomework::history{"resource.".
				      $Apache::inputtags::part.
				      ".solved"} =~ /^correct/ ) {
	foreach $name (@whichopt) {
	    $result.="<br />".$Apache::response::foilgroup{$name.'.value'}.
		":".$Apache::response::foilgroup{$name.'.text'}."\n";
	}
    } else {
	my $temp=1;
	foreach $name (@whichopt) {
	    $result .= "<br /><select ".
		"name=\"HWVAL_$Apache::inputtags::response['-1']:$temp\">".
		$optionlist.
		"</select>\n".$Apache::response::foilgroup{$name.'.text'}."\n";
	    $temp++;
	}
    }
    return $result."<br />";
}

# ================================== Start concept group (return scalar string)
sub start_conceptgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    $Apache::optionresponse::conceptgroup = 1;
    %Apache::response::conceptgroup = {};
    my $result;
    if ($target eq 'edit') {
	$result .= &Apache::edit::tag_start($target,$token,
					"Concept Grouped Foils");
	$result .= &Apache::edit::text_arg('Concept:','concept',$token,'50').
	           "</td></tr>";
	$result .= "<tr><td colspan=\"3\">\n";
    }
    if ($target eq 'modified') {
        my $constructtag = &Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'concept');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    }
    return $result;
}

# ==================================== End concept group (return scalar string)
sub end_conceptgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    $Apache::optionresponse::conceptgroup = 0;
    my $result = '';
    if ($target eq 'web' || $target eq 'grade') {
	#if not there aren't any foils to display and thus no question
	if (defined(@{ $Apache::response::conceptgroup{'names'} })) {
	    my @names = @{ $Apache::response::conceptgroup{'names'} };
	    my $pick = int rand $#names+1;
	    my $name = $names[$pick];
	    push @{ $Apache::response::foilgroup{'names'} }, $name;
	    $Apache::response::foilgroup{"$name.value"} =
		$Apache::response::conceptgroup{"$name.value"};
	    $Apache::response::foilgroup{"$name.text"} =
		$Apache::response::conceptgroup{"$name.text"};
	    my $concept = 
		&Apache::lonxml::get_param('concept',$parstack,$safeeval);
	    $Apache::response::foilgroup{"$name.concept"} = $concept;
	    &Apache::lonxml::debug("Selecting $name in $concept");
	}
    }
    if ($target eq 'edit') {
	$result = &Apache::edit::end_table();
    }
    return $result;
}

# ======================================================== Insert concept group
sub insert_conceptgroup {
    my $result="\n\t\t<conceptgroup concept=\"\">".&insert_foil().
	       "\n\t\t</conceptgroup>\n";
    return $result;
}

# =========================================== Start foil (return scalar string)
sub start_foil {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    my $result = '';
    if ($target eq 'web') { &Apache::lonxml::startredirection; }
    if ($target eq 'edit') {
	$result = &Apache::edit::tag_start($target,$token,"Foil");
	my $level = '-2';
	if ($$tagstack['-2'] eq 'conceptgroup') { $level = '-3'; }
	my @opt;
	eval '@opt ='.&Apache::lonxml::get_param('options',$parstack,
						 $safeeval,$level);
	$result .= &Apache::edit::text_arg('Name:','name',$token);
	$result .= &Apache::edit::select_or_text_arg('Correct Option:',
						     'value',
						     ['unused',(@opt)],$token,
						     '15');
	$result .= '</td></tr><tr><td colspan="3">';
    }
    if ($target eq 'modified') {
	my $constructtag = &Apache::edit::get_new_args($token,$parstack,
						       $safeeval,'value',
						       'name');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    }
    return $result;
}

# ============================================= End foil (return scalar string)
sub end_foil {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    my $text = '';
    my $result = '';
    if ($target eq 'web') { $text=&Apache::lonxml::endredirection; }
    if ($target eq 'web' || $target eq 'grade') {
	my $value = &Apache::lonxml::get_param('value',$parstack,$safeeval);
	if ($value ne 'unused') {
	    my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
	    &Apache::lonxml::debug("Got a name of :$name:");
	    if (!$name) { $name = $Apache::lonxml::curdepth; }
	    &Apache::lonxml::debug("Using a name of :$name:");
	    if ( $Apache::optionresponse::conceptgroup ) {
		push @{ $Apache::response::conceptgroup{'names'} }, $name;
		$Apache::response::conceptgroup{"$name.value"} = $value;
		$Apache::response::conceptgroup{"$name.text"} = $text;	
	    } else {
		push @{ $Apache::response::foilgroup{'names'} }, $name;
		$Apache::response::foilgroup{"$name.value"} = $value;
		$Apache::response::foilgroup{"$name.text"} = $text;
	    }
	}
    }
    if ($target eq 'edit') {
	$result .= &Apache::edit::tag_end($target,$token,'');
    }
    return $result;
}

# ========================================== Insert foil (return scalar string)
sub insert_foil {
    return '
<foil name="" value="unused">
<startouttext />
<endouttext />
</foil>';
}

1;

__END__