--- loncom/homework/inputtags.pm	2000/12/12 22:35:52	1.17
+++ loncom/homework/inputtags.pm	2004/03/26 20:10:42	1.137
@@ -1,280 +1,723 @@
 # The LearningOnline Network with CAPA
 # input  definitons
+#
+# $Id: inputtags.pm,v 1.137 2004/03/26 20:10:42 albertel Exp $
+#
+# Copyright Michigan State University Board of Trustees
+#
+# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
+#
+# LON-CAPA 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.
+#
+# LON-CAPA 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 LON-CAPA; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# /home/httpd/html/adm/gpl.txt
+#
+# http://www.lon-capa.org/
 
 package Apache::inputtags;
+use HTML::Entities();
 use strict;
+use Apache::loncommon;
+use Apache::lonlocal;
 
-sub BEGIN {
-  &Apache::lonxml::register('Apache::inputtags',('textarea','textline','datasubmission'));
+BEGIN {
+    &Apache::lonxml::register('Apache::inputtags',('hiddenline','textfield','textline'));
 }
 
 
 sub initialize_inputtags {
-  @Apache::inputtags::input=();
-  @Apache::inputtags::inputlist=();
-  @Apache::inputtags::response=();
-  @Apache::inputtags::responselist=();
-  @Apache::inputtags::answergroup=();
-  $Apache::inputtags::part='';
-  %Apache::inputtags::params=();
+    # list of current input ids
+    @Apache::inputtags::input=();
+    # list of all input ids seen in this problem
+    @Apache::inputtags::inputlist=();
+    # list of all current response ids
+    @Apache::inputtags::response=();
+    # list of all response ids seen in this problem
+    @Apache::inputtags::responselist=();
+    # list of whether or not a specific response was previously used
+    @Apache::inputtags::previous=();
+    # submission it was used in
+    @Apache::inputtags::previous_version=();
+    # id of current part, 0 means that no part is current 
+    # (inside <problem> only
+    $Apache::inputtags::part='';
+    # list of all part ids seen
+    @Apache::inputtags::partlist=();
+    # list of problem date statuses, the first element is for <problem>
+    # if there is a second element it is for the current <part>
+    @Apache::inputtags::status=();
+    # hash of defined params for the current response
+    %Apache::inputtags::params=();
+    # list of all ids, for <import>, these get join()ed and prepended
+    @Apache::inputtags::import=();
+    # list of all import ids seen
+    @Apache::inputtags::importlist=();
+    # just used to note whether we have seen a response that isn't in a part
+    $Apache::inputtags::response_with_no_part=0;
+}
+
+sub check_for_duplicate_ids {
+    my %check;
+    foreach my $id (@Apache::inputtags::partlist,
+		    @Apache::inputtags::responselist,
+		    @Apache::inputtags::importlist) {
+	$check{$id}++;
+    }
+    my @duplicates;
+    foreach my $id (sort(keys(%check))) {
+	if ($check{$id} > 1) {
+	    push(@duplicates,$id);
+	}
+    }
+    if (@duplicates) {
+	&Apache::lonxml::error("Duplicated ids found, problem will operate incorrectly. Duplicated ids seen: ",join(', ',@duplicates));
+    }
 }
 
 sub start_input {
-  my ($parstack,$safeeval)=@_;
-  my $args ='';
-  if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
-  my $id = &Apache::run::run("{$args;".'return $id}',$safeeval);
-  push (@Apache::inputtags::input,$id);
-  push (@Apache::inputtags::inputlist,$id);
-  return $id;
+    my ($parstack,$safeeval)=@_;
+    my $id = &Apache::lonxml::get_param('id',$parstack,$safeeval);
+    if ($id eq '') { $id = $Apache::lonxml::curdepth; }
+    push (@Apache::inputtags::input,$id);
+    push (@Apache::inputtags::inputlist,$id);
+    return $id;
 }
 
 sub end_input {
-  pop @Apache::inputtags::input;
-  return '';
+    pop @Apache::inputtags::input;
+    return '';
 }
 
-sub start_textarea {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  my $result = "";
-  my $id = &start_input($parstack,$safeeval);
-  if ($target eq 'web') {
-    $result= '<textarea name="HWVAL'.$id.'" value="">';
-  }
-  return $result;
-}
-
-sub end_textarea {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  if ($target eq 'web') {
-    return "</textarea>";
-  } 
-  &end_input;
-  return '';
+sub addchars {
+    my ($fieldid,$addchars)=@_;
+    my $output='';
+    foreach (split(/\,/,$addchars)) {
+	$output.='<a href="javascript:void(document.forms.lonhomework.'.
+	    $fieldid.'.value+=\''.$_.'\')">'.$_.'</a> ';
+    }
+    return $output;
+}
+
+sub start_textfield {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result = "";
+    my $id = &start_input($parstack,$safeeval);
+    my $resid=$Apache::inputtags::response[-1];
+    if ($target eq 'web') {
+	$Apache::lonxml::evaluate--;
+	if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
+	    my $partid=$Apache::inputtags::part;
+	    my $oldresponse = &HTML::Entities::encode($Apache::lonhomework::history{"resource.$partid.$resid.submission"});
+	    my $cols = &Apache::lonxml::get_param('cols',$parstack,$safeeval);
+	    if ( $cols eq '') { $cols = 80; }
+	    my $rows = &Apache::lonxml::get_param('rows',$parstack,$safeeval);
+	    if ( $rows eq '') { $rows = 10; }
+	    my $addchars=&Apache::lonxml::get_param('addchars',$parstack,$safeeval);
+	    $result='';
+	    if ($addchars) {
+		$result.=&addchars('HWVAL_'.$resid,$addchars);
+	    }
+	    $result.= '<textarea wrap="hard" name="HWVAL_'.$resid.'" '.
+		"rows=\"$rows\" cols=\"$cols\">".$oldresponse;
+	    if ($oldresponse ne '') {
+		#get rid of any startup text if the user has already responded
+		&Apache::lonxml::get_all_text("/textfield",$parser);
+	    }
+	} else {
+	    #right or wrong don't show it
+	    #$result='<table border="1"><tr><td><i>'.$oldresponse.'</i></td></tr></table>';
+	    $result='';
+	    #get rid of any startup text
+	    &Apache::lonxml::get_all_text("/textfield",$parser);
+	}
+    } elsif ($target eq 'grade') {
+	my $seedtext=&Apache::lonxml::get_all_text("/textfield",$parser);
+	if ($seedtext eq $ENV{'form.HWVAL_'.$resid}) {
+	    # if the seed text is still there it wasn't a real submission
+	    $ENV{'form.HWVAL_'.$resid}='';
+	}
+    } elsif ($target eq 'edit') {
+	$result.=&Apache::edit::tag_start($target,$token);
+	$result.=&Apache::edit::text_arg('Rows:','rows',$token,4);
+	$result.=&Apache::edit::text_arg('Columns:','cols',$token,4);
+	$result.=&Apache::edit::text_arg
+	    ('Click-On Texts (comma sep):','addchars',$token,10);
+	my $bodytext=&Apache::lonxml::get_all_text("/textfield",$parser);
+	$result.=&Apache::edit::editfield($token->[1],$bodytext,'Text you want to appear by default:',80,2);
+    } elsif ($target eq 'modified') {
+	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+						     $safeeval,'rows','cols',
+						     'addchars');
+	if ($constructtag) {
+	    $result = &Apache::edit::rebuild_tag($token);
+	} else {
+	    $result=$token->[4];
+	}
+	$result.=&Apache::edit::modifiedfield("/textfield",$parser);
+    } elsif ($target eq 'tex') {
+	my $number_of_lines = &Apache::lonxml::get_param('rows',$parstack,$safeeval);
+	my $width_of_box = &Apache::lonxml::get_param('cols',$parstack,$safeeval);
+	if ($$tagstack[-2] eq 'essayresponse' and $Apache::lonhomework::type eq 'exam') {
+	    $result = '\fbox{\fbox{\parbox{\textwidth-5mm}{';
+	    for (my $i=0;$i<int $number_of_lines*2;$i++) {$result.='\strut \\\\ ';}
+	    $result.='\strut \\\\\strut \\\\\strut \\\\\strut \\\\}}}';
+	} else {
+	    my $TeXwidth=$width_of_box/80;
+	    $result = '\vskip 1 mm \fbox{\fbox{\parbox{'.$TeXwidth.'\textwidth-5mm}{';
+	    for (my $i=0;$i<int $number_of_lines*2;$i++) {$result.='\strut \\\\ ';}
+	    $result.='}}}\vskip 2 mm ';
+	}
+    }
+    return $result;
+}
+
+sub end_textfield {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result;
+    if ($target eq 'web') {
+	$Apache::lonxml::evaluate++;
+	if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
+	    return "</textarea>";
+	}
+    } elsif ($target eq 'edit') {
+	$result=&Apache::edit::end_table();
+    }
+    &end_input;
+    return $result;
 }
 
 sub start_textline {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  my $result = "";
-  if ($target eq 'web') {
-    my $args ='';
-    if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
-    my $size = &Apache::run::run("{$args;".'return $size}',$safeeval);
-    if ($size eq '') { $size=20; }
-    my $oldresponse = $Apache::lonhomework::history{"resource.$Apache::inputtags::part.$Apache::inputtags::response['-1'].submission"};
-    $result= '<input type="text" name="HWVAL'.$Apache::inputtags::response['-1'].'" value="'.$oldresponse.'" size="'.$size.'">';
-  }
-  return $result;
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result = "";
+    if ($target eq 'web') {
+	$Apache::lonxml::evaluate--;
+	my $partid=$Apache::inputtags::part;
+	my $id=$Apache::inputtags::response[-1];
+	if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
+	    my $size = &Apache::lonxml::get_param('size',$parstack,$safeeval);
+	    my $maxlength;
+	    if ($size eq '') { $size=20; } else {
+		if ($size < 20) { $maxlength=$size; }
+	    }
+	    my $oldresponse = &HTML::Entities::encode($Apache::lonhomework::history{"resource.$partid.$id.submission"});
+	    if ($Apache::lonhomework::type ne 'exam') {
+		my $addchars=&Apache::lonxml::get_param('addchars',$parstack,$safeeval);
+		$result='';
+		if ($addchars) {
+		    $result.=&addchars('HWVAL_'.$id,$addchars);
+		}
+		$result.= '<input type="text" name="HWVAL_'.$id.'" value="'.
+		    $oldresponse.'" size="'.$size.'" maxlength="'.$maxlength.'" />';
+	    }
+	} else {
+	    #right or wrong don't show what was last typed in.
+	    #$result='<i>'.$oldresponse.'</i>';
+	    $result='';
+	}
+    } elsif ($target eq 'edit') {
+	$result=&Apache::edit::tag_start($target,$token);
+	$result.=&Apache::edit::text_arg('Size:','size',$token,'5').
+	    &Apache::edit::text_arg
+	    ('Click-On Texts (comma sep):','addchars',$token,10)."</td></tr>";
+	$result.=&Apache::edit::end_table;
+    } elsif ($target eq 'modified') {
+	my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,'size','addchars');
+	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
+    } elsif ($target eq 'tex' and $Apache::lonhomework::type ne 'exam') {
+	my $size = &Apache::lonxml::get_param('size',$parstack,$safeeval);
+	if ($size != 0) {$size=$size*2; $size.=' mm';} else {$size='40 mm';}
+	$result='\framebox['.$size.'][s]{\tiny\strut}';
+    }
+    return $result;
 }
 
 sub end_textline {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  return "";
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    if    ($target eq 'web') { $Apache::lonxml::evaluate++; }
+    elsif ($target eq 'edit') { return ('','no'); }
+    return "";
+}
+
+sub start_hiddenline {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result = "";
+    if ($target eq 'web') {
+	$Apache::lonxml::evaluate--;
+	if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
+	    my $partid=$Apache::inputtags::part;
+	    my $id=$Apache::inputtags::response[-1];
+	    my $oldresponse = &HTML::Entities::encode($Apache::lonhomework::history{"resource.$partid.$id.submission"});
+	    if ($Apache::lonhomework::type ne 'exam') {
+		$result= '<input type="hidden" name="HWVAL_'.$id.'" value="'.
+		    $oldresponse.'" />';
+	    }
+	}
+    } elsif ($target eq 'edit') {
+	$result=&Apache::edit::tag_start($target,$token);
+	$result.=&Apache::edit::end_table;
+    }
+    return $result;
 }
 
-#answergroup is deprecated
-#sub start_answergroup {
-#  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-#  my $args ='';
-#  if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
-#  my $id = &Apache::run::run("{$args;".'return $id}',$safeeval);
-#  push (@Apache::inputtags::answergroup,$id);
-#  if ($target == 'web') {
-#    
-#  }
-#  return '';
-#}
-#
-#sub end_answergroup {
-#  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-#  return ''; # <answergroup> has ben deprecated
-#  my $args ='';
-#  if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
-#  my $id = &Apache::run::run("{$args;".'return $id}',$safeeval);
-#  push (@Apache::inputtags::answergroup,$id);
-#  my $result='';
-#  my $button='<input type="submit" name="submit" value="Submit All Answers">';
-#  my $showbutton='1';
-#  my $usedtry='1';
-#  my $response='';
-#  if ( $target == 'web' ) {
-#    if ( defined $ENV{'form.submit'}) {
-#    }
-#    if ($showbutton > 0) { $result.=$button }
-#  }
-#  pop @Apache::inputtags::answergroup;
-#  return $result;
-#}
-
-
-sub start_datasubmission {
-}
-
-sub end_datasubmission {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  if ( $target == 'web' ) {
-    return '<input type="submit" name="submit" value="Submit All Data">';
-  }
-  return '';
+sub end_hiddenline {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    if    ($target eq 'web') { $Apache::lonxml::evaluate++; }
+    elsif ($target eq 'edit') { return ('','no'); }
+    return "";
+}
+
+sub checkstatus {
+    my ($value,$awardref,$msgref)=@_;
+    for (my $i=0;$i<=$#$awardref;$i++) {
+	if ($$awardref[$i] eq $value) {
+	    return ($$awardref[$i],$$msgref[$i]);
+	}
+    }
+    return(undef,undef);
 }
 
 sub finalizeawards {
-  my $result='';
-  my $award;
-  if ($#_ == '-1') { $result = "NO_RESPONSE"; }
-  if ($result eq '' ) {
-    foreach $award (@_) { if ($award eq '') {$result='MISSING_ANSWER'; last;}}
-  }
-  if ($result eq '' ) {
-    foreach $award (@_) { if ($award eq 'ERROR') {$result='ERROR'; last;}}
-  }
-
-  if ($result eq '' ) {
-    foreach $award (@_) { 
-      if ($award eq 'UNIT_FAIL' ||
-	  $award eq 'NO_UNIT' ||
-	  $award eq 'UNIT_NOTNEEDED') {
-	$result=$award; last;
-      }
-    }
-  }
-  if ($result eq '' ) {
-    foreach $award (@_) { 
-      if ($award eq 'WANTED_NUMERIC' || 
-	  $award eq 'BAD_FORMULA') {$result=$award; last;}
-    }
-  }
-  if ($result eq '' ) {
-    foreach $award (@_) { if ($award eq 'SIG_FAIL') {$result=$award; last;} }
-  }
-  if ($result eq '' ) {
-    foreach $award (@_) { if ($award eq 'INCORRECT') {$result=$award; last;} }
-  }
-  if ($result eq '' ) {
-    foreach $award (@_) { if ($award eq 'APPROX_ANS') {$result=$award; last;} }
-  }
-  if ($result eq '' ) { $result='EXACT_ANS'; }
-  return $result
+    my ($awardref,$msgref)=@_;
+    my $result=undef;
+    my $award;
+    my $msg;
+    if ($#$awardref == -1) { $result = "NO_RESPONSE"; }
+    if ($result eq '' ) {
+	my $blankcount;
+	foreach $award (@$awardref) {
+	    if ($award eq '') {
+		$result='MISSING_ANSWER';
+		$blankcount++;
+	    }
+	}
+	if ($blankcount == ($#$awardref + 1)) { $result = 'NO_RESPONSE'; }
+    }
+    if (defined($result)) { return ($result,$msg); }
+    foreach my $possibleaward ('MISSING_ANSWER', 'ERROR', 'NO_RESPONSE',
+			       'TOO_LONG', 'UNIT_INVALID_INSTRUCTOR',
+			       'UNIT_INVALID_STUDENT', 'UNIT_IRRECONCIBLE',
+			       'UNIT_FAIL', 'NO_UNIT',
+			       'UNIT_NOTNEEDED', 'WANTED_NUMERIC',
+			       'BAD_FORMULA', 'SIG_FAIL', 'INCORRECT', 
+			       'MISORDERED_RANK', 'INVALID_FILETYPE',
+			       'DRAFT', 'SUBMITTED', 'ASSIGNED_SCORE',
+			       'APPROX_ANS', 'EXACT_ANS') {
+	($result,$msg)=&checkstatus($possibleaward,$awardref,$msgref);
+	if (defined($result)) { return ($result,$msg); }
+    }
+    return ('ERROR',undef);
 }
 
 sub decideoutput {
-  my ($award)=@_;
-  my $message='';
-  my $button=0;
-  if      ($award eq 'EXACT_ANS' || $award eq 'APPROX_ANS' ) {
-    $message = "Correct computer gets %s";
-    $button=0;
-  } elsif ($award eq 'NO_RESPONSE') {
-    $message = '';
-    $button=1;
-  } elsif ($award eq 'MISSING_ANSWER') {
-    $message = 'Some parts were not submitted';
-    $button = 1;
-  } elsif ($award eq 'WANTED_NUMERIC') {
-    $message = "This question expects a numeric answer";
-    $button=1;
-  } elsif ($award eq 'SIG_FAIL') {
-    $message = "Please adjust significant figures, you provided %s significant figures";
-    $button=1;
-  } elsif ($award eq 'UNIT_FAIL') {
-    $message = "Units incorrect, Computer reads units as %s";
-    $button=1;
-  } elsif ($award eq 'UNIT_NOTNEEDED') {
-    $message = "Only a number required, Computer reads units of %s";
-    $button=1;
-  } elsif ($award eq 'NO_UNIT') {
-    $message = "Units required";
-    $button=1;
-  } elsif ($award eq 'BAD_FORMULA') {
-    $message = "Unable to understand formula";
-    $button=1;
-  } elsif ($award eq 'INCORRECT') {
-    $message = "Incorrect";
-    $button=1;
-  } else {
-    $message = "Unknown message: $award";
-    $button=1;
-  }
-  return ($button,$message);
+    my ($award,$awardmsg,$solved,$previous,$target)=@_;
+    my $message='';
+    my $button=0;
+    my $previousmsg;
+    my $bgcolor='orange';
+    my %possiblecolors =
+	( 'correct' => '#aaffaa',
+	  'charged_try' => '#ffaaaa',
+	  'not_charged_try' => '#ffffaa',
+	  'no_message' => '#fffff',
+	  );
+    if ($previous) { $previousmsg=&mt('You have entered that answer before'); }
+    
+    if      ($solved =~ /^correct/) {
+	if ($award eq 'ASSIGNED_SCORE') {
+	    $message = &mt("A score has been assigned.");
+	} else {
+	    if ($target eq 'tex') {
+		$message = '\textbf{'.&mt('You are correct.').'}';
+	    } else {
+		$message = "<b>".&mt('You are correct.')."</b>";
+	    }
+	    unless ($ENV{'course.'.
+			     $ENV{'request.course.id'}.
+			     '.disable_receipt_display'} eq 'yes') { 
+		$message.=(($target eq 'web')?'<br />':' ').
+		    &mt('Your receipt is').' '.&Apache::lonnet::receipt($Apache::inputtags::part).
+		    (($target eq 'web')?&Apache::loncommon::help_open_topic('Receipt'):'');
+	    }
+	}
+	$bgcolor=$possiblecolors{'correct'};
+	$button=0;
+	$previousmsg='';
+    } elsif ($solved =~ /^excused/) {
+	if ($target eq 'tex') {
+	    $message = ' \textbf{'.&mt('You are excused from the problem.').'} ';
+	} else {
+	    $message = "<b>".&mt('You are excused from the problem.')."</b>";
+	}
+	$bgcolor=$possiblecolors{'charged_try'};
+	$button=0;
+	$previousmsg='';
+    } elsif ($award eq 'EXACT_ANS' || $award eq 'APPROX_ANS' ) {
+	if ($solved =~ /^incorrect/ || $solved eq '') {
+	    $message = &mt("Incorrect");
+	    $bgcolor=$possiblecolors{'charged_try'};
+	    $button=1;
+	} else {
+	    $message = "<b>".&mt('You are correct.')."</b>";
+	    unless ($ENV{'course.'.
+			     $ENV{'request.course.id'}.
+			     '.disable_receipt_display'} eq 'yes') { 
+		$message.=(($target eq 'web')?'<br />':' ').
+		    'Your receipt is '.&Apache::lonnet::receipt($Apache::inputtags::part).
+		    (($target eq 'web')?&Apache::loncommon::help_open_topic('Receipt'):'');
+	    }
+	    $bgcolor=$possiblecolors{'correct'};
+	    $button=0;
+	    $previousmsg='';
+	}
+    } elsif ($award eq 'NO_RESPONSE') {
+	$message = '';
+	$bgcolor=$possiblecolors{'no_feedback'};
+	$button=1;
+    } elsif ($award eq 'MISSING_ANSWER') {
+	$message = &mt('Some items were not submitted.');
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button = 1;
+    } elsif ($award eq 'ERROR') {
+	$message = &mt('An error occured while grading your answer.');
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button = 1;
+    } elsif ($award eq 'TOO_LONG') {
+	$message = &mt("The submitted answer was too long.");
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'WANTED_NUMERIC') {
+	$message = &mt("This question expects a numeric answer.");
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'MISORDERED_RANK') {
+	$message = &mt('You have provided an invalid ranking');
+	if ($target ne 'tex') {
+	    $message.=', '.&mt('please refer to').' '.&Apache::loncommon::help_open_topic('Ranking_Problems','help on ranking problems').'.';
+	}
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'INVALID_FILETYPE') {
+	$message = &mt('The filetype extension of the file you uploaded is not allowed.');
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'SIG_FAIL') {
+	$message = &mt("Significant figures are incorrect, you provided [_1] significant figures while [_2] to [_3] were expected. Submission not graded.",(split(/:/,$awardmsg)));
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'UNIT_INVALID_INSTRUCTOR') {
+	$message = &mt('Error in instructor specifed unit. This error has been reported to the instructor.', $awardmsg);
+	if ($target ne 'tex') {$message.=&Apache::loncommon::help_open_topic('Physical_Units');} 
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'UNIT_INVALID_STUDENT') {
+	$message = &mt('Unable to interpret units. Computer reads units as "[_1]"',
+		       $awardmsg);
+	if ($target ne 'tex') {$message.=&Apache::loncommon::help_open_topic('Physical_Units');} 
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'UNIT_FAIL' || $award eq 'UNIT_IRRECONCIBLE') {
+	$message = &mt('Units incorrect. Computer reads units as "[_1]"',
+		       $awardmsg);
+	if ($target ne 'tex') {$message.=&Apache::loncommon::help_open_topic('Physical_Units');} 
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'UNIT_NOTNEEDED') {
+	$message = &mt('Only a number required. Computer reads units of "[_1]"',$awardmsg);
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'NO_UNIT') {
+	$message = &mt("Units required");
+	if ($target ne 'tex') {$message.=&Apache::loncommon::help_open_topic('Physical_Units')};
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'BAD_FORMULA') {
+	$message = &mt("Unable to understand formula");
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'INCORRECT') {
+	$message = &mt("Incorrect");
+	$bgcolor=$possiblecolors{'charged_try'};
+	$button=1;
+    } elsif ($award eq 'SUBMITTED') {
+	$message = &mt("Your submission has been recorded.");
+	$bgcolor=$possiblecolors{'correct'};
+	$button=1;
+    } elsif ($award eq 'DRAFT') {
+	$message = "A draft copy has been saved.";
+	$bgcolor=$possiblecolors{'not_charged_try'};
+	$button=1;
+    } elsif ($award eq 'ASSIGNED_SCORE') {
+	$message = "A score has been assigned.";
+	$bgcolor=$possiblecolors{'correct'};
+	$button=0;
+    } else {
+	$message = &mt("Unknown message").": $award";
+	$button=1;
+    }
+    if (lc($Apache::lonhomework::problemstatus) eq 'no'  && 
+	$Apache::inputtags::status[-1] ne 'SHOW_ANSWER') {
+	$message = &mt("Answer Submitted: Your final submission will be graded after the due date.");
+	$bgcolor=$possiblecolors{'correct'};
+	$button=1;
+    }
+    return ($button,$bgcolor,$message,$previousmsg);
+}
+
+sub removealldata {
+    my ($id)=@_;
+    foreach my $key (keys(%Apache::lonhomework::results)) {
+	if (($key =~ /^resource\.\Q$id\E\./) && ($key !~ /\.collaborators$/)) {
+	    &Apache::lonxml::debug("Removing $key");
+	    delete($Apache::lonhomework::results{$key});
+	}
+    }
 }
 
 sub setgradedata {
-  my ($award,$id) = @_;
-  if ( $award eq 'APPROX_ANS' || $award eq 'EXACT_ANS' ) {
-    $Apache::lonhomework::results{"resource.$id.tries"} =
-      $Apache::lonhomework::history{"resource.$id.tries"} + 1;
-    $Apache::lonhomework::results{"resource.$id.solved"} =
-      'correct_by_student';
-    $Apache::lonhomework::results{"resource.$id.awarded"} = '1';
-  } elsif ( $award eq 'INCORRECT' ) {
-    $Apache::lonhomework::results{"resource.$id.tries"} =
-      $Apache::lonhomework::history{"resource.$id.tries"} + 1;
-    $Apache::lonhomework::results{"resource.$id.solved"} =
-      'incorrect_attempted';
-  } else {
-    $Apache::lonhomework::results{"resource.$id.solved"} =
-      'incorrect_attempted';
-  }
-  $Apache::lonhomework::results{"resource.$id.award"} = $award;
+    my ($award,$msg,$id,$previously_used) = @_;
+    # if the student already has it correct, don't modify the status
+    if (!$Apache::lonhomework::scantronmode &&
+	$Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
+	$Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER') {
+	$Apache::lonhomework::results{"resource.$id.afterduedate"}=$award;
+	return '';
+    } elsif ( $Apache::lonhomework::history{"resource.$id.solved"} !~
+	      /^correct/ || $Apache::lonhomework::scantronmode ||
+	      lc($Apache::lonhomework::problemstatus) eq 'no') {
+	#handle assignment of tries and solved status
+	my $solvemsg;
+	if ($Apache::lonhomework::scantronmode) {
+	    $solvemsg='correct_by_scantron';
+	} else {
+	    $solvemsg='correct_by_student';
+	}
+	if ($Apache::lonhomework::history{"resource.$id.afterduedate"}) {
+	    $Apache::lonhomework::results{"resource.$id.afterduedate"}='';
+	}
+	if ( $award eq 'ASSIGNED_SCORE') {
+	    $Apache::lonhomework::results{"resource.$id.tries"} =
+		$Apache::lonhomework::history{"resource.$id.tries"} + 1;
+	    $Apache::lonhomework::results{"resource.$id.solved"} =
+		$solvemsg;
+	    my $numawards=scalar(@Apache::inputtags::response);
+	    $Apache::lonhomework::results{"resource.$id.awarded"} = 0;
+	    foreach my $res (@Apache::inputtags::response) {
+		$Apache::lonhomework::results{"resource.$id.awarded"}+=
+		    $Apache::lonhomework::results{"resource.$id.$res.awarded"};
+	    }
+	    if ($numawards > 0) {
+		$Apache::lonhomework::results{"resource.$id.awarded"}/=
+		    $numawards;
+	    }
+	} elsif ( $award eq 'APPROX_ANS' || $award eq 'EXACT_ANS' ) {
+	    $Apache::lonhomework::results{"resource.$id.tries"} =
+		$Apache::lonhomework::history{"resource.$id.tries"} + 1;
+	    $Apache::lonhomework::results{"resource.$id.solved"} =
+		$solvemsg;
+	    $Apache::lonhomework::results{"resource.$id.awarded"} = '1';
+	} elsif ( $award eq 'INCORRECT' ) {
+	    $Apache::lonhomework::results{"resource.$id.tries"} =
+		$Apache::lonhomework::history{"resource.$id.tries"} + 1;
+	    if (lc($Apache::lonhomework::problemstatus) eq 'no') {
+		$Apache::lonhomework::results{"resource.$id.awarded"} = 0;
+	    }
+	    $Apache::lonhomework::results{"resource.$id.solved"} =
+		'incorrect_attempted';
+	} elsif ( $award eq 'SUBMITTED' ) {
+	    $Apache::lonhomework::results{"resource.$id.tries"} =
+		$Apache::lonhomework::history{"resource.$id.tries"} + 1;
+	    $Apache::lonhomework::results{"resource.$id.solved"} =
+		'ungraded_attempted';
+	} elsif ( $award eq 'DRAFT' ) {
+	    $Apache::lonhomework::results{"resource.$id.solved"} = '';
+	} elsif ( $award eq 'NO_RESPONSE' ) {
+	    #no real response so delete any data that got stored
+	    &removealldata($id);
+	    return '';
+	} else {
+	    $Apache::lonhomework::results{"resource.$id.solved"} =
+		'incorrect_attempted';
+	    if (lc($Apache::lonhomework::problemstatus) eq 'no') {
+		$Apache::lonhomework::results{"resource.$id.tries"} =
+		    $Apache::lonhomework::history{"resource.$id.tries"} + 1;
+		$Apache::lonhomework::results{"resource.$id.awarded"} = 0;
+	    }
+	}
+	if (defined($msg)) {
+	    $Apache::lonhomework::results{"resource.$id.awardmsg"} = $msg;
+	}
+	# did either of the overall awards chage? If so ignore the 
+	# previous check
+	if (($Apache::lonhomework::results{"resource.$id.awarded"} eq
+	     $Apache::lonhomework::history{"resource.$id.awarded"}) &&
+	    ($Apache::lonhomework::results{"resource.$id.solved"} eq
+	     $Apache::lonhomework::history{"resource.$id.solved"})) {
+	    # check if this was a previous submission if it was delete the
+	    # unneeded data and update the previously_used attribute
+	    if ( $previously_used eq 'PREVIOUSLY_USED') {
+		if (lc($Apache::lonhomework::problemstatus) ne 'no') {
+		    delete($Apache::lonhomework::results{"resource.$id.tries"});
+		    $Apache::lonhomework::results{"resource.$id.previous"} = '1';
+		}
+	    } elsif ( $previously_used eq 'PREVIOUSLY_LAST') {
+		#delete all data as they student didn't do anything, but save
+		#the list of collaborators.
+		&removealldata($id);
+		#and since they didn't do anything we were never here
+		return '';
+	    } else {
+		$Apache::lonhomework::results{"resource.$id.previous"} = '0';
+	    }
+	}
+    } elsif ( $Apache::lonhomework::history{"resource.$id.solved"} =~
+	      /^correct/ ) {
+	#delete all data as they student already has it correct
+	&removealldata($id);
+	#and since they didn't do anything we were never here
+	return '';
+    }
+    $Apache::lonhomework::results{"resource.$id.award"} = $award;
 }
 
 sub grade {
-  my ($target) = @_;
-  my $id = $Apache::inputtags::part;
-  my $result='';
-  my $response='';
-  if ( $target == 'web' ) {
-    if ( defined $ENV{'form.submit'}) {
-      my @awards = ();
-      &Apache::lonxml::debug("$#Apache::inputtags::responselist");
-      foreach $response (@Apache::inputtags::responselist) {
-	&Apache::lonxml::debug("looking for response.$id.$response.awarddetail");
-	my $value=$Apache::lonhomework::results{"resource.$id.$response.awarddetail"};
-	if ( $value ne '' ) {
-	  &Apache::lonxml::debug("keep ing $value from $response for $id");
-	  push (@awards,$value);
-	} else {
-	  &Apache::lonxml::debug("skipping $value from $response for $id");
+    my ($target) = @_;
+    my $id = $Apache::inputtags::part;
+    my $response='';
+    if ( defined $ENV{'form.submitted'}) {
+	my (@awards,@msgs);
+	foreach $response (@Apache::inputtags::response) {
+	    &Apache::lonxml::debug("looking for response.$id.$response.awarddetail");
+	    my $value=$Apache::lonhomework::results{"resource.$id.$response.awarddetail"};
+	    &Apache::lonxml::debug("keeping $value from $response for $id");
+	    push (@awards,$value);
+	    $value=$Apache::lonhomework::results{"resource.$id.$response.awardmsg"};
+	    &Apache::lonxml::debug("got message $value from $response for $id");
+	    push (@msgs,$value);
 	}
-      }
-      my $finalaward = &finalizeawards(@awards);
-      &Apache::lonxml::debug("final award $finalaward");
-      &setgradedata($finalaward,$id);
+	my ($finalaward,$msg) = &finalizeawards(\@awards,\@msgs);
+	my $previously_used;
+	if ( $#Apache::inputtags::previous eq $#awards ) {
+	    my $match=0;
+	    my @matches;
+	    foreach my $versionar (@Apache::inputtags::previous_version) {
+		foreach my $version (@$versionar) {
+		    $matches[$version]++;
+		}
+	    }
+	    foreach my $elem (@matches) {if ($elem eq ($#awards+1)) {$match=1;}}
+	    if ($match) {
+		$previously_used = 'PREVIOUSLY_LAST';
+		foreach my $value (@Apache::inputtags::previous) {
+		    if ($value eq 'PREVIOUSLY_USED' ) {
+			$previously_used = $value;
+			last;
+		    }
+		}
+	    }
+	}
+	&Apache::lonxml::debug("final award $finalaward, $previously_used, message $msg");
+	&setgradedata($finalaward,$msg,$id,$previously_used);
     }
-  }
-  return $result;
+    return '';
 }
 
 sub gradestatus {
-  my ($id) = @_;
-  my $showbutton = 1;
-  my $message = '';
-  my $trystr='';
+    my ($id,$target) = @_;
+    my $showbutton = 1;
+    my $bgcolor = '';
+    my $message = '';
+    my $latemessage = '';
+    my $trystr='';
     my $button='';
-  
-  my ($date,$passed) = &Apache::lonhomework::check_date("OPEN_DATE",$id);
+    my $previousmsg='';
 
-  if ( $passed ) {  
-    my $award = $Apache::lonhomework::history{"resource.$id.award"};
-    &Apache::lonxml::debug("Found Award |$award|");
-    if ( $award ne '' ) {
-      &Apache::lonxml::debug('Getting message');
-      ($showbutton,$message) = &decideoutput($award);
-    }
-    my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
-    my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
-    &Apache::lonxml::debug("goit maxtries of :$maxtries:");
-    if ( $tries eq '' ) { $tries = '0'; }
-    if ( $maxtries eq '' ) { $maxtries = '2'; } 
-    if ( $showbutton ) {
-      $trystr = "<br></br>Tries $tries/$maxtries";
-    }
-    if ( $tries >= $maxtries ) { $showbutton = 0; }
-    if ( $showbutton ) { 
-      $button = '<input type="submit" name="submit" value="Submit All Answers"><br></br>';
+    my $status = $Apache::inputtags::status['-1'];
+    &Apache::lonxml::debug("gradestatus has :$status:");
+    if ( $status ne 'CLOSED' && $status ne 'UNAVAILABLE' &&
+	 $status ne 'INVALID_ACCESS') {  
+	my $award = $Apache::lonhomework::history{"resource.$id.award"};
+	my $solved = $Apache::lonhomework::history{"resource.$id.solved"};
+	my $previous = $Apache::lonhomework::history{"resource.$id.previous"};
+	my $awardmsg = $Apache::lonhomework::history{"resource.$id.awardmsg"};
+	&Apache::lonxml::debug("Found Award |$award|$solved|$awardmsg");
+	if ( $award ne '' || $solved ne '') {
+	    &Apache::lonxml::debug('Getting message');
+	    ($showbutton,$bgcolor,$message,$previousmsg) =
+		&decideoutput($award,$awardmsg,$solved,$previous,$target);
+	    if ($target eq 'tex') {
+		$message='\vskip 2 mm '.$message.' ';
+	    } else {
+		$message="<td bgcolor=\"$bgcolor\">$message</td>";
+		if ($previousmsg) {
+		    $previousmsg="<td bgcolor=\"#aaaaff\">$previousmsg</td>";
+		}
+	    }
+	}
+	my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
+	my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
+	&Apache::lonxml::debug("got maxtries of :$maxtries:");
+	#if tries are set to negative turn off the Tries/Button and messages
+	if (defined($maxtries) && $maxtries < 0) { return ''; }
+	if ( $tries eq '' ) { $tries = '0'; }
+	if ( $maxtries eq '' ) { $maxtries = '2'; } 
+	if ( $maxtries eq 'con_lost' ) { $maxtries = '0'; } 
+	my $tries_text=&mt('Tries');
+	if ( $Apache::lonhomework::type eq 'survey') { $tries_text=&mt('Submissions'); }
+	if ( $showbutton ) {
+	    if ($target eq 'tex') {
+		if ($ENV{'request.state'} ne "construct" && $Apache::lonhomework::type ne 'exam') {
+		    $trystr = ' {\vskip 1 mm \small \textit{'.$tries_text.'} '.$tries.'/'.$maxtries.'} \vskip 2 mm ';
+		} else {
+		    $trystr = '\vskip 0 mm ';
+		}
+	    } else {
+		$trystr = "<td><nobr>".$tries_text." $tries";
+		if($ENV{'request.state'} ne 'construct') {
+		    $trystr.="/$maxtries";
+		} else {
+		    if (defined($Apache::inputtags::params{'maxtries'})) {
+			$trystr.="/".$Apache::inputtags::params{'maxtries'};
+		    }
+		}
+		$trystr.="</nobr></td>";
+	    }
+	}
+	if ( $status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER') {$showbutton = 0;}
+	if ( $showbutton ) { 
+	    if ($target ne 'tex') {
+		$button = '<input type="submit" name="submit" value="'.&mt('Submit Answer').'" />';
+	    }
+	}
+	if ($Apache::lonhomework::history{"resource.$id.afterduedate"}) {
+	    #last submissions was after due date
+	    if ($target eq 'tex') {
+		$latemessage=' The last submission was after the Due Date ';
+	    } else {
+		$latemessage="<td bgcolor=\"#ffaaaa\">The last submission was after the Due Date</td>";
+	    }
+	}
+    }
+    my $output= $previousmsg.$latemessage.$message.$trystr;
+    if ($output =~ /^\s*$/) {
+	return $button;
+    } else {
+	if ($target eq 'tex') {
+	    return $button.' \vskip 0 mm '.$output.' ';
+	} else {
+	    return '<table><tr><td>'.$button.'</td>'.$output.'</tr></table>';
+	}
     }
-  }
-  return $button.$message.$trystr;
 }
 1;
 __END__