--- loncom/homework/lonhomework.pm	2001/01/11 15:20:58	1.31
+++ loncom/homework/lonhomework.pm	2003/01/19 08:11:38	1.106
@@ -1,38 +1,110 @@
+# The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler
+#
+# $Id: lonhomework.pm,v 1.106 2003/01/19 08:11:38 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 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::hint;
-use Apache::outputtags;
+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::Constants qw(:common);
+use HTML::Entities();
+use Apache::loncommon();
+#use Time::HiRes qw( gettimeofday tv_interval );
+
+BEGIN {
+  &Apache::lonxml::register_insert();
+}
 
 sub get_target {
   if ( $ENV{'request.state'} eq "published") {
-    if ( defined $ENV{'form.submit'}) {
+    if ( defined($ENV{'form.grade_target'}  ) 
+	 && ($ENV{'form.grade_target'} eq 'tex')) {
+      return ($ENV{'form.grade_target'});
+    } elsif ( defined($ENV{'form.grade_target'}  ) 
+	 && ($Apache::lonhomework::viewgrades == 'F' )) {
+      return ($ENV{'form.grade_target'});
+    }
+ 
+    if ( defined($ENV{'form.submitted'})) {
       return ('grade', 'web');
     } else {
       return ('web');
     }
   } elsif ($ENV{'request.state'} eq "construct") {
-    if ( defined $ENV{'form.preview'}) {
-      if ( defined $ENV{'form.submit'}) {
+    if ( defined($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 {
-      #return ('edit');
-      #edit is currently broken
-      return ('web');
+      if ( $ENV{'form.problemmode'} eq 'View' ||
+	   $ENV{'form.problemmode'} eq 'Discard Edits and View') {
+	if ( defined($ENV{'form.submitted'}) &&
+	     (!defined($ENV{'form.resetdata'})) ) {
+	  return ('grade', 'web','answer');
+	} else {
+	  return ('web','answer');
+	}
+      } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
+	if ( $ENV{'form.submitted'} eq 'edit' ) {
+	  if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
+	    return ('modified','web','answer');
+	  } else {
+	    return ('modified','edit');
+	  }
+	} else {
+	  return ('edit');
+	}
+      } else {
+	return ('web');
+      }
     }
   }
   return ();
@@ -47,31 +119,66 @@ sub setup_vars {
 sub send_header {
   my ($request)= @_;
   $request->print(&Apache::lontexconvert::header());
-  $ENV{'request.uri'}=$request->uri;
 #  $request->print('<form name='.$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)= @_;
 #  $request->print('</form>');
   $request->print(&Apache::lontexconvert::footer());
 }
 
-#@Apache::lonhomework::date_status=();
-#@Apache::lonhomework::date_msg=();
-sub check_date {
+$Apache::lonxml::browse='';
+
+# JB, 9/24/2002: Any changes in this function may require a change
+# in lonnavmaps::resource::getDateStatus.
+sub check_access {
   my ($id) = @_;
   my $date ='';
-  my $status = '';
+  my $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';
+    $datemsg='is in under construction';
+    return ($status,$datemsg);
+  }
+
   &Apache::lonxml::debug("checking for part :$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';
+	$date="may open later.";
+	return($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 = "an unknown date"; $passed = 0;
@@ -95,7 +202,7 @@ sub check_date {
     $datemsg = "is due at $date";
   } elsif ($type eq 'answerdate') {
     $status='CLOSED';
-    $datemsg = "was due as $lastdate, and answers will be available at $date";
+    $datemsg = "was due on $lastdate, and answers will be available on $date";
   }
   if ($status eq 'CAN_ANSWER') {
     #check #tries
@@ -105,87 +212,421 @@ sub check_date {
     if ( $maxtries eq '' ) { $maxtries = '2'; } 
     if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; } 
   }
+
+  if (($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 ($ENV{'request.state'} eq "construct") {
-    &Apache::lonxml::debug("in construction ignoring dates");
+  if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
+    &Apache::lonxml::debug("should be allowed to browse a resource when closed");
     $status='CAN_ANSWER';
-    $datemsg='is in under construction';
+    $datemsg='is closed but you are allowed to view it';
   }
+
   return ($status,$datemsg);
 }
 
-sub handler {
-  my $request=$_[0];
+sub showhash {
+  my (%hash) = @_;
+  &showhashsubset(\%hash,'.');
+  return '';
+}
 
-  if ( $ENV{'user.name'} eq 'albertel' ) { $Apache::lonxml::debug=1; }
-  
-  my (@targets) = &get_target();
+sub showarray {
+    my ($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'});
+  $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
+  return ''
+}
+
+sub setupheader {
+  my $request=$_[0];
   if ($ENV{'browser.mathml'}) {
     $request->content_type('text/xml');
   } else {
     $request->content_type('text/html');
   }
+  if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
+    &Apache::loncommon::no_cache($request);
+  }
   $request->send_http_header;
   return OK if $request->header_only;
-  
-  &Apache::lonhomework::send_header($request);
-  
-  #check if allowed to see
-  
+  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>Undid changes, Switched $filebak and $file</b></p>");
+    } else {
+      $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
+      $error=1;
+    }
+  } else {
+    my $fs=Apache::File->new(">$filebak");
+    if (defined($fs)) {
+      print $fs $$problem;
+      $request->print("<b>Making Backup to $filebak</b><br />");
+    } else {
+      $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
+      $error=2;
+    }
+    my $fh=Apache::File->new(">$file");
+    if (defined($fh)) {
+      print $fh $$result;
+      $request->print("<b>Saving Modifications to $file</b><br />");
+    } else {
+      $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
+      $error|=4;
+    }
+  }
+  return $error;
+}
+
+sub analyze_header {
+    my ($request) = @_;
+    my $result.='<html><body bgcolor="#FFFFFF">
+            <form name="lonhomework" method="POST" action="'.
+	      $ENV{'request.uri'}.'">
+            <input type="submit" name="problemmode" value="EditXML" />
+            <input type="submit" name="problemmode" value="Edit" />
+            <hr />
+            <input type="submit" name="submit" value="View" />
+            <hr />
+            List of possible answers:
+            </form>';
+    $request->print($result);
+    $request->rflush();
+}
+
+sub analyze {
+    my ($request,$file) = @_;
+    &Apache::lonxml::debug("Analyze");
+    my $result;
+    my %overall;
+    my %allparts;
+    my $rndseed=$ENV{'form.rndseed'};
+    &analyze_header($request);
+    for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
+	my $subresult=&Apache::lonnet::ssi($request->uri,
+					   ('grade_target' => 'analyze'),
+					   ('rndseed' => $i));
+	&Apache::lonxml::debug(":$subresult:");
+	(my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
+	my %analyze=&Apache::lonnet::str2hash($subresult);
+	&Apache::lonhomework::showhash(%analyze);
+	my @parts = @{ $analyze{'parts'} };
+	foreach my $part (@parts) {
+	    if (!exists($allparts{$part})) {$allparts{$part}=1;};
+	    if ($analyze{$part.'.type'} eq 'numericalresponse') {
+		push( @{ $overall{$part.'.answer'} },
+		      [@{ $analyze{$part.'.answer'} }]);
+	    }
+	}
+    }
+    foreach my $part (keys(%allparts)) {
+	$request->print('<table><tr><td>Part '.$part.'</td></tr>');
+	foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
+	    $request->print('<tr><td>'.join('</td><td>',@{ $answer }).
+			    '</td></tr>');
+	}
+    }
+    &Apache::lonhomework::showhash(%overall);
+    return $result;
+}
+
+sub editxmlmode {
+  my ($request,$file) = @_;
+  my $result;
+  my $problem=&Apache::lonnet::getfile($file);
+  if ($problem == -1) {
+    &Apache::lonxml::error("<b> Unable to find <i>$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 $xml_help = Apache::loncommon::help_open_topic("Problem_Editor_XML_Index");
+    if ($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="EditXML" />
+            <input type="submit" name="problemmode" value="Discard Edits and View" />
+            <input type="submit" name="problemmode" value="Edit" />
+            <hr />
+            <input type="submit" name="submit" value="Submit Changes" />
+            <input type="submit" name="submit" value="Submit Changes and View" />
+            <input type="submit" name="Undo" value="undo" />
+            <hr />
+            ' . $xml_help . ' Problem Help<br>
+            <textarea rows="'.$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 $file=&Apache::lonnet::filelocation("",$request->uri);
+    #my $t0 = [&gettimeofday()];
     my $problem=&Apache::lonnet::getfile($file);
     if ($problem == -1) {
       &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
       $problem='';
     }
-    
+
     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 'web' && &Apache::lonnet::symbread() eq '') {
-      $request->print("Vieiwing this problem as not a student, submissions will be ignored.");
-    }
-    if ($target eq 'grade') {
-      my $resultkey;
-      foreach $resultkey (sort keys %Apache::lonhomework::history) {
-	&Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::history{$resultkey}");
+    &Apache::inputtags::initialize_inputtags();
+    &Apache::outputtags::initialize_outputtags();
+    &Apache::edit::initialize_edit();
+    if ($target eq 'analyze') { %Apache::lonhomework::anaylze=(); }
+    if ($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);
+
+    #$request->print("Result follows:");
+    if ($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);
       }
-      &Apache::lonxml::debug("\n<br>restored values^</br>\n");
+      #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);
     }
-    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>");
-      $default='';
+    #$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); }
     }
-    $result = &Apache::lonxml::xmlparse($target, $problem,
-			$default.&setup_vars($target),%mystyle);
+  }
+  if (@allnames && !$result) {
+    $result="<option>Select a $extension type</option>\n<option>".
+      join('</option><option>',sort(@allnames)).'</option>';
+  }
+  return $result;
+}
 
-    #$request->print("Result follows:");
-    $request->print($result);
-    #$request->print(":Result ends");
-    if ($target eq 'grade') {
+sub newproblem {
+    my ($request) = @_;
+    my $extension=$request->uri;
+    $extension=~s:^.*\.([\w]+)$:$1:;
+    &Apache::lonxml::debug("Looking for :$extension:");
+    if ($ENV{'form.template'} &&
+	$ENV{'form.template'} ne "Select a $extension type") {
+	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'}) {
+	# 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 $templatelist=&get_template_list('',$extension);
+	my $url=$request->uri;
+	my $dest = &Apache::lonnet::filelocation("",$request->uri);
+	my $instructions;
+	if ($templatelist) { $instructions=", select a template from the pull-down menu below.<br />Then";}
+	$request->print(<<ENDNEWPROBLEM);
+<body bgcolor="#FFFFFF">
+<h1>Creating a new $extension resource</h1>
+The requested file <tt>$url</tt> currently does not exist.
+<p>
+To create a new $extension$instructions click on the "Create $extension" button.
+</p>
+<p><form action="$url" method="POST">
+ENDNEWPROBLEM
+	if (defined($templatelist)) {
+	    $request->print("<select name=\"template\">$templatelist</select>");
+	}
+	$request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");
+	$request->print("</form></p></body>");
+    }
+    return '';
+}
 
-      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");
+sub view_or_edit_menu {
+  my ($request) = @_;
+  my $url=$request->uri;
+  $request->print(<<EDITMENU);
+<body bgcolor="#FFFFFF">
+<form action="$url" method="POST">
+Would you like to <input type="submit" name="problemmode" value="View"> or
+<input type="submit" name="problemmode" value="Edit"> the problem.
+</form>
+</body>
+EDITMENU
+}
+
+sub handler {
+  #my $t0 = [&gettimeofday()];
+  my $request=$_[0];
+
+#  if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
+  $Apache::lonxml::debug=$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
+      $request->internal_redirect('/adm/ambiguous'); return;
     }
-    
-    my ($temp) = keys %Apache::lonhomework::results;
-    if ( $temp ne '' ) {
-      &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(%Apache::lonhomework::results));
+  }
+
+  if ($ENV{'request.state'} eq "construct") {
+    if ($ENV{'form.resetdata'} eq 'Reset Submissions') {
+      my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
+      &Apache::lonnet::tmpreset($symb,'',$domain,$name);
+    }
+    if ( -e $file ) {
+      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 ($ENV{'form.problemmode'} eq 'Answer Distribution') {
+	&analyze($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);
   }
-  &Apache::lonhomework::send_footer($request);
-  
+  #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;
 
 }