--- loncom/homework/lonhomework.pm	2001/02/19 20:35:21	1.39
+++ loncom/homework/lonhomework.pm	2002/05/24 18:55:23	1.79
@@ -1,38 +1,92 @@
+# The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler
+#
+# $Id: lonhomework.pm,v 1.79 2002/05/24 18:55:23 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
 
 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::Constants qw(:common);
+use HTML::Entities();
+#use Time::HiRes qw( gettimeofday tv_interval );
+
+BEGIN {
+  &Apache::lonxml::register_insert();
+}
 
 sub get_target {
   if ( $ENV{'request.state'} eq "published") {
-    if ( defined $ENV{'form.submitted'}) {
+    if ( defined($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 $ENV{'form.submitted'}) {
+    if ( defined($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 ( $ENV{'form.problemmode'} eq 'View' ) {
+	if ( defined($ENV{'form.submitted'}) &&
+	     (!defined($ENV{'form.resetdata'})) ) {
+	  return ('grade', 'web','answer');
+	} else {
+	  return ('web','answer');
+	}
+      } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
+	if ( $ENV{'form.submitted'} eq 'edit' ) {
+	  return ('modified','edit');
+	} else {
+	  return ('edit');
+	}
+      } else {
+	return ('web');
+      }
     }
   }
   return ();
@@ -47,7 +101,6 @@ sub setup_vars {
 sub send_header {
   my ($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.'">');
 }
 
@@ -68,7 +121,8 @@ sub send_footer {
 }
 
 $Apache::lonxml::browse='';
-sub check_date {
+
+sub check_access {
   my ($id) = @_;
   my $date ='';
   my $status = '';
@@ -78,6 +132,7 @@ sub check_date {
   my $type;
   my $passed;
   &Apache::lonxml::debug("checking for part :$id:");
+  &Apache::lonxml::debug("time:".time);
   foreach $temp ("opendate","duedate","answerdate") {
     $lastdate = $date;
     $date = &Apache::lonnet::EXT("resource.$id.$temp");
@@ -114,6 +169,13 @@ 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 (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
     &Apache::lonxml::debug("should be allowed to browse a resource when closed");
@@ -128,97 +190,346 @@ sub check_date {
   return ($status,$datemsg);
 }
 
-sub handler {
-  my $request=$_[0];
-  
- if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;} else {$Apache::lonxml::debug=0;}
-  
-  my (@targets) = &get_target();
+sub showhash {
+  my (%hash) = @_;
+  &showhashsubset(\%hash,'');
+  return '';
+}
+
+sub showhashsubset {
+  my ($hash,$keyre) = @_;
+  my $resultkey;
+  foreach $resultkey (sort keys %$hash) {
+    if ($resultkey =~ /$keyre/) {
+      if (ref($$hash{$resultkey})) {
+	if ($$hash{$resultkey} =~ /ARRAY/ ) {
+	  my $string="$resultkey ---- (";
+	  foreach my $elm (@{ $$hash{$resultkey} }) {
+	    $string.="$elm,";
+	  }
+	  chop($string);
+	  &Apache::lonxml::debug("$string)");
+	} else {
+	  &Apache::lonxml::debug("$resultkey ---- $$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;
+  return ''
+}
 
-  #setup permissions
-  $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
-  $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
-
-  #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
-      $request->internal_redirect('/adm/ambiguous'); return; 
+sub handle_save_or_undo {
+  my ($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;
+}
 
-  &Apache::lonhomework::send_header($request);
-  &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
-  
+sub analyze {
+  my ($request,$file) = @_;
+  &Apache::lonxml::debug("Analyze");
+  my $result=&Apache::lonnet::ssi($request->uri,('grade_target' => 'analyze'));
+  &Apache::lonxml::debug(":$result:");
+  (my $garbage,$result)=split(/_HASH_REF__/,$result,2);
+  &showhash(&Apache::lonnet::str2hash($result));
+  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); }
+  }
+  my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
+  if ($cols > 80) { $cols = 80; }
+  $result.='<html><body bgcolor="#FFFFFF">
+            <form name="lonhomework" method="POST" action="'.
+	      $ENV{'request.uri'}.'">
+            <input type="hidden" name="problemmode" value="EditXML" />
+            <input type="submit" name="problemmode" value="View" />
+            <input type="submit" name="problemmode" value="Edit" />
+            <hr />
+            <input type="submit" name="submit" value="Submit Changes" />
+            <input type="submit" name="Undo" value="undo" />
+            <hr />
+            <textarea rows="'.$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 ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); } 
+    &Apache::edit::initialize_edit;
+    if ($target eq 'analyze') { %Apache::lonhomework::anaylze=(); }
     if ($target eq 'web') {
-      if (&Apache::lonnet::symbread() eq '') {
+      my ($symb)=&Apache::lonxml::whichuser();
+      if ($symb eq '') {
 	if ($ENV{'request.state'} eq "construct") {
-	  $request->print("In construction space, submissions ignored<br />");
 	} else {
 	  $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");
 	}
       }
-      if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
-    }
-    if ($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");
+      #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
     }
+    #if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }
+    #if ($target eq 'web') { &showhash(%ENV); }
+
     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='';
     }
-    $result = &Apache::lonxml::xmlparse($target, $problem,
+    &Apache::lonxml::debug("Should be parsing now");
+    $result = &Apache::lonxml::xmlparse($request, $target, $problem,
 			$default.&setup_vars($target),%mystyle);
 
     #$request->print("Result follows:");
-    $request->print($result);
+    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);
+    }
     #$request->print(":Result ends");
-    if ($target eq 'grade') {
+    #my $td=&tv_interval($t0);
+  }
+}
 
-      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");
+# 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 $result;
+  &Apache::lonxml::debug("Looking for :$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 {
+      $result.="<option>$name</option>";
     }
-    
-    my ($temp) = keys %Apache::lonhomework::results;
-    if ( $temp ne '' ) {
-      &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(%Apache::lonhomework::results));
+  }
+  return $result;
+}
+
+sub newproblem {
+    my ($request) = @_;
+    my $extension=$request->uri;
+    $extension=~s:^.*\.([\w]+)$:$1:;
+    &Apache::lonxml::debug("Looking for :$extension:");
+    if ($ENV{'form.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'}) {
+	# 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);
+	if (!defined($templatelist)) {
+	    # We didn't find a template, so just create a blank problem.
+	    $request->print(<<ENDNEWPROBLEM);
+<body bgcolor="#FFFFFF">
+The requested file $url doesn\'t exist. You can create a new $extension <br />
+<form action="$url" method="POST">
+<input type="submit" name="newfile" value="New $extension"><br />
+</form>
+</body>
+ENDNEWPROBLEM
+            return '';
+        }
+	$request->print(<<ENDNEWPROBLEM);
+<body bgcolor="#FFFFFF">
+The requested file $url doesn\'t exist. You can create a new $extension <br />
+<form action="$url" method="POST">
+<input type="submit" value="New $extension"><br />
+<select name="template">
+$templatelist
+</select>
+</form>
+</body>
+ENDNEWPROBLEM
     }
+    return '';
+}
+
+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;}
+
+  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
+  if ( defined($ENV{'form.problemmode'}) &&
+       ref($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
+      $request->internal_redirect('/adm/ambiguous'); return;
+    }
+  }
+
+  if ($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;
 
 }