--- loncom/homework/lonhomework.pm	2001/11/29 18:36:59	1.63
+++ loncom/homework/lonhomework.pm	2002/02/27 20:23:26	1.71
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler
 #
-# $Id: lonhomework.pm,v 1.63 2001/11/29 18:36:59 albertel Exp $
+# $Id: lonhomework.pm,v 1.71 2002/02/27 20:23:26 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -34,6 +34,7 @@ use strict;
 use Apache::style;
 use Apache::lonxml;
 use Apache::lonnet;
+use Apache::lonplot;
 use Apache::inputtags;
 use Apache::structuretags;
 use Apache::randomlabel;
@@ -43,12 +44,16 @@ use Apache::outputtags;
 use Apache::Constants qw(:common);
 #use Time::HiRes qw( gettimeofday tv_interval );
 
-sub BEGIN {
+BEGIN {
   &Apache::lonxml::register_insert();
 }
 
 sub get_target {
   if ( $ENV{'request.state'} eq "published") {
+    if ( defined($ENV{'form.grade_target'}) 
+	 && ($Apache::lonhomework::viewgrades == 'F' )) {
+      return ($ENV{'form.grade_target'});
+    }
     if ( defined($ENV{'form.submitted'})) {
       return ('grade', 'web');
     } else {
@@ -203,7 +208,9 @@ sub setupheader {
   } else {
     $request->content_type('text/html');
   }
-  &Apache::loncommon::no_cache($request);
+  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 ''
@@ -211,37 +218,80 @@ sub setupheader {
 
 sub handle_save_or_undo {
   my ($request,$problem,$result) = @_;
-  my $fileout = &Apache::lonnet::filelocation("",$request->uri);
-  my $filesave=$fileout.".bak";
+  my $file    = &Apache::lonnet::filelocation("",$request->uri);
+  my $filebak =$file.".bak";
+  my $filetmp =$file.".tmp";
+  my $error=0;
 
   if ($ENV{'form.Undo'} eq 'undo') {
-    if (copy($filesave,$fileout)) {
-      $request->print("<b>Undid changes, Copied $filesave to $fileout<br /></b>");
+    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("<font color=\"red\" size=\"+1\"><b>Unable to undo, unable to copy $filesave to $fileout<br /></b></font>");
+      $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 $fs=Apache::File->new(">$filesave");
+    my $fs=Apache::File->new(">$filebak");
     if (defined($fs)) {
       print $fs $$problem;
-      $request->print("<b>Making Backup to $filesave</b><br />");
+      $request->print("<b>Making Backup to $filebak</b><br />");
     } else {
-      $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filesave</b></font>");
+      $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
+      $error=2;
     }
-    my $fh=Apache::File->new(">$fileout");
+    my $fh=Apache::File->new(">$file");
     if (defined($fh)) {
       print $fh $$result;
-      $request->print("<b>Saving Modifications to $fileout</b><br />");
+      $request->print("<b>Saving Modifications to $file</b><br />");
     } else {
-      $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $fileout</b></font>");
+      $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
+      $error|=4;
     }
   }
+  return $error;
+}
+
+sub editxmlmode {
+  my ($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">'.
+	      $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);
@@ -263,13 +313,14 @@ sub renderpage {
       }
       #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
     }
-    if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }
+    #if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }
 
     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("Should be parsing now");
     $result = &Apache::lonxml::xmlparse($target, $problem,
 			$default.&setup_vars($target),%mystyle);
 
@@ -308,24 +359,44 @@ sub get_template_list {
 }
 
 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($request,$file);
-  } else {
-    my $templatelist=&get_template_list('',$extension);
-    my $url=$request->uri;
-    my $dest = &Apache::lonnet::filelocation("",$request->uri);
-    $request->print(<<ENDNEWPROBLEM);
+    my ($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 request file $url doesn\'t exist. You can create a new $extension <br />
+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">
@@ -334,9 +405,8 @@ $templatelist
 </form>
 </body>
 ENDNEWPROBLEM
-  }
-
-  return '';
+    }
+    return '';
 }
 
 sub view_or_edit_menu {
@@ -365,7 +435,15 @@ sub handler {
   $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$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'} } ) {
+    &Apache::lonxml::debug("Problem Modes ".join(':',@{ $ENV{'form.problemmode'} }));
+    my @modes=@{ $ENV{'form.problemmode'} };
+    undef $ENV{'form.problemmode'};
+    $ENV{'form.problemmode'}=$modes[-1];
+  }
+  &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
   my $file=&Apache::lonnet::filelocation("",$request->uri);
 
   #check if we know where we are
@@ -385,8 +463,11 @@ sub handler {
     if ( -e $file ) {
       if (!(defined $ENV{'form.problemmode'})) {
 	#first visit to problem in construction space
-	&view_or_edit_menu($request);
-	#&renderpage($request,$file);
+	#&view_or_edit_menu($request);
+	$ENV{'form.problemmode'}='View';
+	&renderpage($request,$file);
+      } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
+	&editxmlmode($request,$file);
       } else {
 	&renderpage($request,$file);
       }