--- loncom/homework/lonhomework.pm	2000/12/04 22:08:57	1.18
+++ loncom/homework/lonhomework.pm	2003/09/19 12:26:56	1.148
@@ -1,130 +1,730 @@
+# The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler
+#
+# $Id: lonhomework.pm,v 1.148 2003/09/19 12:26:56 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/
+#
 # Guy Albertelli
 # 11/30 Gerd Kortemeyer
+# 6/1,8/17,8/18 Gerd Kortemeyer
+# 7/18 Jeremy Bowers
 
 package Apache::lonhomework;
 use strict;
-use Apache::style;
-use Apache::lonxml;
-use Apache::lonnet;
-use Apache::inputtags;
-use Apache::structuretags;
-use Apache::response;
+use Apache::style();
+use Apache::lonxml();
+use Apache::lonnet();
+use Apache::lonplot();
+use Apache::inputtags();
+use Apache::structuretags();
+use Apache::randomlabel();
+use Apache::response();
+use Apache::hint();
+use Apache::outputtags();
+use Apache::caparesponse();
+use Apache::radiobuttonresponse();
+use Apache::optionresponse();
+use Apache::imageresponse();
+use Apache::essayresponse();
+use Apache::externalresponse();
+use Apache::rankresponse();
+use Apache::matchresponse();
+use Apache::chemresponse();
+use Apache::Constants qw(:common);
+use HTML::Entities();
+use Apache::loncommon();
+use Apache::lonlocal;
+#use Time::HiRes qw( gettimeofday tv_interval );
 
+BEGIN {
+    &Apache::lonxml::register_insert();
+}
 
 sub get_target {
-  if ( $ENV{'request.state'} eq "published") {
-    if ( defined $ENV{'form.submit'}) {
-      return ('grade', 'web');
-    } else {
-      return ('web');
+    if (($ENV{'request.state'} eq "published") ||
+	($ENV{'request.state'} eq "uploaded")) {
+	if ( defined($ENV{'form.grade_target'}  ) 
+	     && ($ENV{'form.grade_target'} eq 'tex')) {
+	    return ($ENV{'form.grade_target'});
+	} elsif ( defined($ENV{'form.grade_target'}  ) 
+		  && ($Apache::lonhomework::viewgrades eq 'F' )) {
+	    return ($ENV{'form.grade_target'});
+	}
+
+	if ( defined($ENV{'form.submitted'}) &&
+	     ( !defined($ENV{'form.resetdata'})) &&
+	     ( !defined($ENV{'form.newrandomization'}))) {
+	    return ('grade', 'web');
+	} else {
+	    return ('web');
+	}
+    } elsif ($ENV{'request.state'} eq "construct") {
+	if ( defined($ENV{'form.grade_target'}) ) {
+	    return ($ENV{'form.grade_target'});
+	}
+	if ( defined($ENV{'form.preview'})) {
+	    if ( defined($ENV{'form.submitted'})) {
+		return ('grade', 'web');
+	    } else {
+		return ('web');
+	    }
+	} else {
+	    if ( $ENV{'form.problemmode'} eq 'View' ||
+		 $ENV{'form.problemmode'} eq 'Discard Edits and View') {
+		if ( defined($ENV{'form.submitted'}) &&
+		     (!defined($ENV{'form.resetdata'})) &&
+		     (!defined($ENV{'form.newrandomization'}))) {
+		    return ('grade', 'web','answer');
+		} else {
+		    return ('web','answer');
+		}
+	    } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
+		if ( $ENV{'form.submitted'} eq 'edit' ) {
+		    if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
+			return ('modified','web','answer');
+		    } else {
+			return ('modified','edit');
+		    }
+		} else {
+		    return ('edit');
+		}
+	    } else {
+		return ('web');
+	    }
+	}
     }
-  } elsif ($ENV{'request.state'} eq "construct") {
-    if ( defined $ENV{'form.preview'}) {
-      if ( defined $ENV{'form.submit'}) {
-	return ('grade', 'web');
-      } else {
-	return ('web');
-      }
-    } else {
-      return ('edit');
-    }
-  }
-  return ();
+    return ();
 }
 
 sub setup_vars {
-  my ($target) = @_;
-  return ';'
+    my ($target) = @_;
+    return ';'
 #  return ';$external::target='.$target.';';
 }
 
 sub send_header {
-  my ($request)= @_;
-  $request->print(&Apache::lontexconvert::header());
-  $ENV{'request.uri'}=$request->uri;
+    my ($request)= @_;
+    $request->print(&Apache::lontexconvert::header());
 #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
 }
 
+sub createmenu {
+    my ($which,$request)=@_;
+    if ($which eq 'grade') {
+	$request->print('<script language="JavaScript"> 
+          hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
+                 "height=350,width=150,menubar=no");
+          </script>');
+    }
+}
+
 sub send_footer {
-  my ($request)= @_;
+    my ($request)= @_;
 #  $request->print('</form>');
-  $request->print(&Apache::lontexconvert::footer());
+    $request->print(&Apache::lontexconvert::footer());
 }
 
-sub handler {
-  my $request=$_[0];
+$Apache::lonxml::browse='';
 
-  $Apache::lonxml::debug=1;
-  
-  my (@targets) = &get_target();
-
-  if ($ENV{'browser.mathml'}) {
-    $request->content_type('text/xml');
-  } else {
-    $request->content_type('text/html');
-  }
-  $request->send_http_header;
-  return 'OK' if $request->header_only;
-  
-  &Apache::lonhomework::send_header($request);
-  
-  foreach my $target (@targets) {
-    my $file=&Apache::lonnet::filelocation("",$request->uri);
-    my $problem=&Apache::lonnet::getfile($file);
-    if ($problem == -1) {
-      &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
-      $problem='';
+# JB, 9/24/2002: Any changes in this function may require a change
+# in lonnavmaps::resource::getDateStatus.
+sub check_access {
+    my ($id) = @_;
+    my $date ='';
+    my $status;
+    my $datemsg = '';
+    my $lastdate = '';
+    my $temp;
+    my $type;
+    my $passed;
+
+    if ($ENV{'request.state'} eq "construct") {
+	&Apache::lonxml::debug("in construction ignoring dates");
+	$status='CAN_ANSWER';
+	$datemsg=&mt('is in under construction');
+	return ($status,$datemsg);
     }
-    
-    my %mystyle;
-    my $result = '';
-    &Apache::inputtags::initialize_inputtags;
-    %Apache::lonhomework::results=();
-    %Apache::lonhomework::history=&Apache::lonnet::restore;
-    #ignore error conditions
-    my ($temp)=keys %Apache::lonhomework::history ;
-    if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); } 
-    
-    if ($target eq 'grade') {
-      my $resultkey;
-      foreach $resultkey (sort keys %Apache::lonhomework::history) {
-	&Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::history{$resultkey}");
-      }
-      &Apache::lonxml::debug("\n<br>restored values^</br>\n");
-    }
-    my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
-    if ($default == -1) {
-      &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
-      $default='';
+
+    &Apache::lonxml::debug("checking for part :$id:");
+    &Apache::lonxml::debug("time:".time);
+    foreach $temp ("opendate","duedate","answerdate") {
+	$lastdate = $date;
+	$date = &Apache::lonnet::EXT("resource.$id.$temp");
+	my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
+	if ($thistype =~ /^(con_lost|no_such_host)/ ||
+	    $date     =~ /^(con_lost|no_such_host)/) {
+	    $status='UNAVAILABLE';
+	    $date=&mt("may open later.");
+	    return($status,$date);
+	}
+	if ($thistype eq 'date_interval') {
+	    if ($temp eq 'opendate') {
+		$date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
+	    }
+	    if ($temp eq 'answerdate') {
+		$date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
+	    }
+	}
+	&Apache::lonxml::debug("found :$date: for :$temp:");
+	if ($date eq '') {
+	    $date = &mt("an unknown date"); $passed = 0;
+	} elsif ($date eq 'con_lost') {
+	    $date = &mt("an indeterminate date"); $passed = 0;
+	} else {
+	    if (time < $date) { $passed = 0; } else { $passed = 1; }
+	    $date = localtime $date;
+	}
+	if (!$passed) { $type=$temp; last; }
+    }
+    &Apache::lonxml::debug("have :$type:$passed:");
+    if ($passed) {
+	$status='SHOW_ANSWER';
+	$datemsg=$date;
+    } elsif ($type eq 'opendate') {
+	$status='CLOSED';
+	$datemsg = &mt("will open on")." $date";
+    } elsif ($type eq 'duedate') {
+	$status='CAN_ANSWER';
+	$datemsg = &mt("is due at")." $date";
+    } elsif ($type eq 'answerdate') {
+	$status='CLOSED';
+	$datemsg = &mt("was due on")." $lastdate".&mt(", and answers will be available on")." $date";
+    }
+    if ($status eq 'CAN_ANSWER') {
+	#check #tries, and if correct.
+	my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
+	my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
+	if ( $tries eq '' ) { $tries = '0'; }
+	if ( $maxtries eq '' ) { $maxtries = '2'; } 
+	if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
+	# if (correct and show prob status) or excused then CANNOT_ANSWER
+	if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
+	    &&
+	    lc($Apache::lonhomework::problemstatus) ne 'no')
+	   ||
+	   $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
+	    $status = 'CANNOT_ANSWER';
+	}
+    }
+
+  #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
+  #    (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
+  #    return ('UNCHECKEDOUT','needs to be checked out');
+  #}
+
+
+    &Apache::lonxml::debug("sending back :$status:$datemsg:");
+    if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
+	&Apache::lonxml::debug("should be allowed to browse a resource when closed");
+	$status='CAN_ANSWER';
+	$datemsg=&mt('is closed but you are allowed to view it');
+    }
+
+    return ($status,$datemsg);
+}
+
+sub showhash {
+    my (%hash) = @_;
+    &showhashsubset(\%hash,'.');
+    return '';
+}
+
+sub showarray {
+    my ($array)=@_;
+    my $string="(";
+    foreach my $elm (@{ $array }) {
+	if (ref($elm)) {
+	    if ($elm =~ /ARRAY/ ) {
+		$string.=&showarray($elm);
+	    }
+	} else {
+	    $string.="$elm,"
+	}
+    }
+    chop($string);
+    $string.=")";
+    return $string;
+}
+
+sub showhashsubset {
+    my ($hash,$keyre) = @_;
+    my $resultkey;
+    foreach $resultkey (sort keys %$hash) {
+	if ($resultkey =~ /$keyre/) {
+	    if (ref($$hash{$resultkey})) {
+		if ($$hash{$resultkey} =~ /ARRAY/ ) {
+		    &Apache::lonxml::debug("$resultkey ---- ".
+					   &showarray($$hash{$resultkey}));
+		} elsif ($$hash{$resultkey} =~ /HASH/ ) {
+		    &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
+		    &showhashsubset($$hash{$resultkey},'.');
+		} else {
+		    &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
+		}
+	    } else {
+		&Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
+	    }
+	}
+    }
+    &Apache::lonxml::debug("\n<br />restored values^</br>\n");
+    return '';
+}
+
+sub setuppermissions {
+    $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
+    my $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
+    if (! $viewgrades && 
+	exists($ENV{'request.course.sec'}) && 
+	$ENV{'request.course.sec'} !~ /^\s*$/) {
+	$viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'}.
+                                               '/'.$ENV{'request.course.sec'});
+    }
+    $Apache::lonhomework::viewgrades = $viewgrades;
+    return ''
+}
+
+sub setupheader {
+    my $request=$_[0];
+    if ($ENV{'browser.mathml'}) {
+	$request->content_type('text/xml');
+    } else {
+	$request->content_type('text/html');
     }
-    if ( $target eq 'grade') { 
-      $Apache::lonxml::textredirection = 0; 
+    $request->content_encoding('UTF-8');
+    if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
+	&Apache::loncommon::no_cache($request);
+    }
+    $request->send_http_header;
+    return OK if $request->header_only;
+    return ''
+}
+
+sub handle_save_or_undo {
+    my ($request,$problem,$result) = @_;
+    my $file    = &Apache::lonnet::filelocation("",$request->uri);
+    my $filebak =$file.".bak";
+    my $filetmp =$file.".tmp";
+    my $error=0;
+
+    if ($ENV{'form.Undo'} eq 'undo') {
+	my $error=0;
+	if (!copy($file,$filetmp)) { $error=1; }
+	if ((!$error) && (!copy($filebak,$file))) { $error=1; }
+	if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
+	if (!$error) {
+	    $request->print("<p><b>".&mt("Undid changes, Switched")." $filebak ".&mt("and")." $file</b></p>");
+	} else {
+	    $request->print("<p><font color=\"red\" size=\"+1\"><b>".&mt("Unable to undo, unable to switch")." $filebak ".&mt("and")." $file</b></font></p>");
+	    $error=1;
+	}
     } else {
-      $Apache::lonxml::textredirection = 1; 
+	my $fs=Apache::File->new(">$filebak");
+	if (defined($fs)) {
+	    print $fs $$problem;
+	    $request->print("<b>".&mt("Making Backup to").
+			    " $filebak</b><br />");
+	} else {
+	    $request->print("<font color=\"red\" size=\"+1\"><b>".&mt("Unable to make backup")." $filebak</b></font>");
+	    $error=2;
+	}
+	my $fh=Apache::File->new(">$file");
+	if (defined($fh)) {
+	    print $fh $$result;
+	    $request->print("<b>".&mt("Saving Modifications to").
+			    " $file</b><br />");
+	} else {
+	    $request->print("<font color=\"red\" size=\"+1\"><b>".
+			    &mt("Unable to write to")." $file</b></font>");
+	    $error|=4;
+	}
     }
-    $result = &Apache::lonxml::xmlparse($target, $problem,
-			$default.&setup_vars($target),%mystyle);
+    return $error;
+}
+
+sub analyze_header {
+    my ($request) = @_;
+    my $result.='<html>
+            <head><title>'.&mt("Analyzing a problem").'</title></head>
+            <body bgcolor="#FFFFFF">
+            <form name="lonhomework" method="POST" action="'.
+	    $ENV{'request.uri'}.'">
+            <input type="submit" name="problemmode" value="'.&mt("EditXML").'" />
+            <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
+            <hr />
+            <input type="submit" name="submit" value="'.&mt("View").'" />
+            <hr />
+            '.&mt('List of possible answers').':
+            </form>';
+    $request->print($result);
+    $request->rflush();
+}
 
-    #$request->print("Result follows:");
+sub analyze_footer {
+    my ($request) = @_;
+    my $result='</body></html>';
     $request->print($result);
-    #$request->print(":Result ends");
-    if ($target eq 'grade') {
-      my $resultkey;
-      foreach $resultkey (sort keys %Apache::lonhomework::results) {
-	&Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::results{$resultkey}");
-      }
-      &Apache::lonxml::debug("\n<br>storing values^</br>\n");
+    $request->rflush();
+}
+
+sub analyze {
+    my ($request,$file) = @_;
+    &Apache::lonxml::debug("Analyze");
+    my $result;
+    my %overall;
+    my %allparts;
+    my $rndseed=$ENV{'form.rndseed'};
+    &analyze_header($request);
+    my %prog_state=
+	&Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
+					      &mt('Getting Problem Variants'),
+					      $ENV{'form.numtoanalyze'});
+    for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
+	&Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
+						 &mt('last problem'));
+	my $subresult=&Apache::lonnet::ssi($request->uri,
+					   ('grade_target' => 'analyze'),
+					   ('rndseed' => $i+$rndseed));
+	(my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
+	my %analyze=&Apache::lonnet::str2hash($subresult);
+	my @parts;
+	if (defined(@{ $analyze{'parts'} })) {
+	    @parts=@{ $analyze{'parts'} };
+	}
+	foreach my $part (@parts) {
+	    if (!exists($allparts{$part})) {$allparts{$part}=1;};
+	    if ($analyze{$part.'.type'} eq 'numericalresponse'	||
+		$analyze{$part.'.type'} eq 'stringresponse'	||
+		$analyze{$part.'.type'} eq 'formularesponse'   ) {
+		push( @{ $overall{$part.'.answer'} },
+		      [@{ $analyze{$part.'.answer'} }]);
+	    }
+	}
+    }
+    &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
+					  &mt('Analyzing Results'));
+    foreach my $part (sort(keys(%allparts))) {
+	if (defined(@{ $overall{$part.'.answer'} })) {
+	    my $num_cols=scalar(@{ $overall{$part.'.answer'}->[0] });
+	    $request->print('<table><tr><td colspan="'.($num_cols+1).'">'.&mt('Part').' '.$part.'</td></tr>');
+	    my %frequency;
+	    foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
+		$frequency{join("\0",@{ $answer })}++;
+	    }
+	    $request->print('<tr><td colspan="'.($num_cols).'">'.&mt('Answer').'</td><td>'.&mt('Frequency').'</td></tr>');
+	    foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
+		$request->print('<tr><td align="right">'.
+				join('</td><td align="right">',split("\0",$answer)).
+				'</td><td>('.$frequency{$answer}.
+				')</td></tr>');
+	    }
+	    $request->print('</table>');
+	} else {
+	    $request->print('<p>'.&mt('Part').' '.$part.' '.
+			    &mt('is not analyzable at this time').'</p>');
+	}
+    }
+    if (scalar(keys(%allparts)) == 0 ) {
+	$request->print('<p>'.&mt('Found no analyzable parts in this problem,
+                         currently only Numerical, Formula and String response
+                         styles are supported.').'</p>');
+    }
+    &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
+    &analyze_footer($request);
+    &Apache::lonhomework::showhash(%overall);
+    return $result;
+}
+
+sub editxmlmode {
+    my ($request,$file) = @_;
+    my $result;
+    my $problem=&Apache::lonnet::getfile($file);
+    if ($problem eq -1) {
+	&Apache::lonxml::error("<b> ".&mt('Unable to find').
+			       " <i>$file</i></b>");
+	$problem='';
+    }
+    if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
+	my $error=&handle_save_or_undo($request,\$problem,
+				       \$ENV{'form.editxmltext'});
+	if (!$error) { $problem=&Apache::lonnet::getfile($file); }
+    }
+    &Apache::lonhomework::showhashsubset(\%ENV,'^form');
+    if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
+	&Apache::lonhomework::showhashsubset(\%ENV,'^form');
+	$ENV{'form.problemmode'}='View';
+	&renderpage($request,$file);
+    } else {
+	my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
+	my $xml_help = Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
+							      "Problem Editing Help");
+	if ($cols > 80) { $cols = 80; }
+	if ($cols < 70) { $cols = 70; }
+	if ($rows < 20) { $rows = 20; }
+	$result.='<html><body bgcolor="#FFFFFF">
+            <form name="lonhomework" method="POST" action="'.
+	    $ENV{'request.uri'}.'">
+            <input type="hidden" name="problemmode" value="'.&mt('EditXML').'" />
+            <input type="submit" name="problemmode" value="'.&mt('Discard Edits and View').'" />
+            <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
+            <hr />
+            <input type="submit" name="submit" value="'.&mt('Submit Changes').'" />
+            <input type="submit" name="submit" value="'.&mt('Submit Changes and View').'" />
+            <input type="submit" name="Undo" value="'.&mt('undo').'" />
+            <hr />
+            ' . $xml_help . '
+            <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
+	    &HTML::Entities::encode($problem).'</textarea>
+            </form></body></html>';
+	$request->print($result);
+    }
+    return '';
+}
+
+sub renderpage {
+    my ($request,$file) = @_;
+
+    my (@targets) = &get_target();
+    &Apache::lonxml::debug("Running targets ".join(':',@targets));
+    foreach my $target (@targets) {
+	#my $t0 = [&gettimeofday()];
+	my $problem=&Apache::lonnet::getfile($file);
+	if ($problem eq -1) {
+	    &Apache::lonxml::error("<b> ".&mt('Unable to find')." <i>$file</i></b>");
+	    $problem='';
+	}
+
+	my %mystyle;
+	my $result = '';
+	if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
+	if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
+	if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
+
+	&Apache::lonxml::debug("Should be parsing now");
+	$result = &Apache::lonxml::xmlparse($request, $target, $problem,
+					    &setup_vars($target),%mystyle);
+	undef($Apache::lonhomework::parsing_a_problem);
+	#$request->print("Result follows:");
+	if ($target eq 'modified') {
+	    &handle_save_or_undo($request,\$problem,\$result);
+	} else {
+	    if ($target eq 'analyze') {
+		$result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
+		undef(%Apache::lonhomework::analyze);
+	    }
+	    #my $td=&tv_interval($t0);
+	    #if ( $Apache::lonxml::debug) {
+	    #$result =~ s:</body>::;
+	    #$result.="<br />Spent $td seconds processing target $target\n</body>";
+	    #}
+	    $request->print($result);
+	    $request->rflush();
+	}
+	#$request->print(":Result ends");
+	#my $td=&tv_interval($t0);
+    }
+}
+
+# with no arg it returns a HTML <option> list of the template titles
+# with one arg it returns the filename associated with the arg passed
+sub get_template_list {
+    my ($namewanted,$extension) = @_;
+    my $result;
+    my @allnames;
+    &Apache::lonxml::debug("Looking for :$extension:");
+    foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
+	my $name=&Apache::lonnet::metadata($file,'title');
+	if ($namewanted && ($name eq $namewanted)) {
+	    $result=$file;
+	    last;
+	} else {
+	    if ($name) { push (@allnames, $name); }
+	}
     }
+    if (@allnames && !$result) {
+	$result="<option>".&mt("Select a")." $extension ".&mt('template')."</option>\n<option>".
+	    join('</option><option>',sort(@allnames)).'</option>';
+    }
+    return $result;
+}
+
+sub newproblem {
+    my ($request) = @_;
+    my $extension=$request->uri;
+    $extension=~s:^.*\.([\w]+)$:$1:;
+    &Apache::lonxml::debug("Looking for :$extension:");
+    my $templatelist=&get_template_list('',$extension);
+    if ($ENV{'form.template'} &&
+	$ENV{'form.template'} ne "Select a $extension template") {
+	use File::Copy;
+	my $file = &get_template_list($ENV{'form.template'},$extension);
+	my $dest = &Apache::lonnet::filelocation("",$request->uri);
+	copy($file,$dest);
+	&renderpage($request,$dest);
+    } elsif($ENV{'form.newfile'} && !$templatelist) {
+	# I don't like hard-coded filenames but for now, this will work.
+	use File::Copy;
+	my $templatefilename =
+	    $request->dir_config('lonIncludes').'/templates/blank.problem';
+	&Apache::lonxml::debug("$templatefilename");
+	my $dest = &Apache::lonnet::filelocation("",$request->uri);
+	copy($templatefilename,$dest);
+	&renderpage($request,$dest);
+    } else {
+	my $url=$request->uri;
+	my $dest = &Apache::lonnet::filelocation("",$request->uri);
+	my $errormsg;
+	if ($ENV{'form.newfile'}) {
+	    $errormsg='<p><font color="red">'.&mt('You did not select a template.').'</font></p>'."\n";
+	}
+	my $instructions;
+	if ($templatelist) { $instructions=&mt(", select a template from the pull-down menu below.").'<br />'.&mt("Then");}
+	my %lt=&Apache::lonlocal::texthash( 'create' => 'Creating a new',
+			  'resource' => 'resource',
+			  'requested' => 'The requested file',
+			  'not exist' => 'currently does not exist',
+			  'createnew' => 'To create a new',
+			  'click' => 'click on the',
+			  'Create' => 'Create',
+			  'button' => 'button');
+	$request->print(<<ENDNEWPROBLEM);
+<body bgcolor="#FFFFFF">
+<h1>$lt{'create'} $extension $lt{'resource'}</h1>
+$errormsg
+$lt{'requested'} <tt>$url</tt> $lt{'not exist'}.
+<p>
+<b>$lt{'createnew'} $extension$instructions $lt{'click'} "$lt{'Create'} $extension" $lt{'button'}.</b>
+</p>
+<p><form action="$url" method="POST">
+ENDNEWPROBLEM
+	if (defined($templatelist)) {
+	    $request->print("<select name=\"template\">$templatelist</select>");
+	}
+	$request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"".&mt('Create')." $extension\" />");
+	$request->print("</form></p></body>");
+    }
+    return '';
+}
+
+sub view_or_edit_menu {
+    my ($request) = @_;
+    my $url=$request->uri;
+    my %lt=&Apache::lonlocal::texthash( 'would' => 'Would you like to',
+		      'view' => 'View',
+		      'Edit' => 'edit',
+		      'or' => 'or',
+		      'the problem' => 'the problem');
+    $request->print(<<EDITMENU);
+<body bgcolor="#FFFFFF">
+<form action="$url" method="POST">
+$lt{'would'} <input type="submit" name="problemmode" value="&lt{'view'}">
+&lt{'or'} <input type="submit" name="problemmode" value="&lt{'Edit'}">
+&lt{'the problem'}.
+</form>
+</body>
+EDITMENU
+}
+
+sub handler {
+    #my $t0 = [&gettimeofday()];
+    my $request=$_[0];
     
-    my ($temp) = keys %Apache::lonhomework::results;
-    if ( $temp ne '' ) {
-      &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(%Apache::lonhomework::results));
-    }
-  }
-  &Apache::lonhomework::send_footer($request);
-  
-  return 'OK';
+    $Apache::lonxml::debug=$ENV{'user.debug'};
+
+    if (&setupheader($request)) { return OK; }
+    $ENV{'request.uri'}=$request->uri;
+
+    #setup permissions
+    $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
+    $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
+    &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
+    # some times multiple problemmodes are submitted, need to select
+    # the last one
+    &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
+    if ( defined($ENV{'form.problemmode'}) &&
+	 ref($ENV{'form.problemmode'}) ) {
+	&Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
+	my $mode=$ENV{'form.problemmode'}->[-1];
+	undef $ENV{'form.problemmode'};
+	$ENV{'form.problemmode'}=$mode;
+    }
+    &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
+    my $file=&Apache::lonnet::filelocation("",$request->uri);
+
+    #check if we know where we are
+    if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) { 
+	# if we are browsing we might not be able to know where we are
+	if ($Apache::lonhomework::browse ne 'F') {
+	    #should know where we are, so ask
+	    if ( &Apache::lonnet::mod_perl_version() == 2 ) {
+		&Apache::lonnet::cleanenv();
+	    }
+	    $request->internal_redirect('/adm/ambiguous'); return;
+	}
+    }
+
+    my ($symb) = &Apache::lonxml::whichuser();
+    &Apache::lonxml::debug('symb is '.$symb);
+    if ($ENV{'request.state'} eq "construct" || $symb eq '') {
+	if ($ENV{'form.resetdata'} eq 'Reset Submissions' ||
+	    $ENV{'form.resetdata'} eq 'New Problem Variation' ||
+	    $ENV{'form.newrandomization'} eq 'New Randomization') {
+	    my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
+	    &Apache::lonnet::tmpreset($symb,'',$domain,$name);
+	    &Apache::lonxml::debug("Attempt reset");
+	}
+    }
+    if ($ENV{'request.state'} eq "construct") {
+	if ( -e $file ) {
+	    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+						    ['problemmode']);
+	    if (!(defined $ENV{'form.problemmode'})) {
+		#first visit to problem in construction space
+		#&view_or_edit_menu($request);
+		$ENV{'form.problemmode'}='View';
+		&renderpage($request,$file);
+	    } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
+		&editxmlmode($request,$file);
+	    } elsif ($ENV{'form.problemmode'} eq 'Calculate answers') {
+		&analyze($request,$file);
+	    } else {
+		&renderpage($request,$file);
+	    }
+	} else {
+	    # requested file doesn't exist in contruction space
+	    &newproblem($request);
+	}
+    } else {
+	# just render the page normally outside of construction space
+	&Apache::lonxml::debug("not construct");
+	&renderpage($request,$file);
+    }
+    #my $td=&tv_interval($t0);
+    #&Apache::lonxml::debug("Spent $td seconds processing");
+    # &Apache::lonhomework::send_footer($request);
+    # always turn off debug messages
+    $Apache::lonxml::debug=0;
+    return OK;
 
 }