--- loncom/homework/lonhomework.pm	2000/11/30 16:20:49	1.17
+++ loncom/homework/lonhomework.pm	2001/04/26 21:28:33	1.41
@@ -1,6 +1,7 @@
 # The LON-CAPA Homework handler
 # Guy Albertelli
 # 11/30 Gerd Kortemeyer
+# 6/1 Gerd Kortemeyer
 
 package Apache::lonhomework;
 use strict;
@@ -10,44 +11,34 @@ use Apache::lonnet;
 use Apache::inputtags;
 use Apache::structuretags;
 use Apache::response;
-
-
-sub subhandler {
-  my ($target,$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=(); } 
-
-  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>");
-    $default='';
-  }
-
-  return Apache::lonxml::xmlparse($target, $problem,
-				     $default.&setup_vars($target),%mystyle);
-}
+use Apache::hint;
+use Apache::outputtags;
+use Apache::Constants qw(:common);
 
 sub get_target {
   if ( $ENV{'request.state'} eq "published") {
-    return 'web';
+    if ( defined $ENV{'form.submitted'}) {
+      return ('grade', 'web');
+    } else {
+      return ('web');
+    }
   } elsif ($ENV{'request.state'} eq "construct") {
     if ( defined $ENV{'form.preview'}) {
-      return 'web';
+      if ( defined $ENV{'form.submitted'}) {
+	return ('grade', 'web');
+      } else {
+	return ('web');
+      }
     } else {
-      return 'edit';
+      return ('grade','web');
+      if ( $ENV{'form.submitted'} eq 'edit' ) {
+	return ('modified','edit');
+      } else {
+	return ('edit');
+      }
     }
   }
+  return ();
 }
 
 sub setup_vars {
@@ -63,68 +54,222 @@ sub send_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)= @_;
 #  $request->print('</form>');
   $request->print(&Apache::lontexconvert::footer());
 }
 
-sub getfilenothere {
-  my ($filename) = @_;
-  my $a="";
-  if (! -e $filename ) {
-    &Apache::lonnet::subscribe($filename);
-    &Apache::lonnet::repcopy($filename);
+$Apache::lonxml::browse='';
+sub check_date {
+  my ($id) = @_;
+  my $date ='';
+  my $status = '';
+  my $datemsg = '';
+  my $lastdate = '';
+  my $temp;
+  my $type;
+  my $passed;
+  &Apache::lonxml::debug("checking for part :$id:");
+  foreach $temp ("opendate","duedate","answerdate") {
+    $lastdate = $date;
+    $date = &Apache::lonnet::EXT("resource.$id.$temp");
+    &Apache::lonxml::debug("found :$date: for :$temp:");
+    if ($date eq '') {
+      $date = "an unknown date"; $passed = 0;
+    } elsif ($date eq 'con_lost') {
+      $date = "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 = "will open on $date";
+  } elsif ($type eq 'duedate') {
+    $status='CAN_ANSWER';
+    $datemsg = "is due at $date";
+  } elsif ($type eq 'answerdate') {
+    $status='CLOSED';
+    $datemsg = "was due on $lastdate, and answers will be available on $date";
+  }
+  if ($status eq 'CAN_ANSWER') {
+    #check #tries
+    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'; } 
   }
-  {
-    my $fh=Apache::File->new($filename);
+  &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';
+    $datemsg='is closed but you are allowed to view it';
+  }
+  if ($ENV{'request.state'} eq "construct") {
+    &Apache::lonxml::debug("in construction ignoring dates");
+    $status='CAN_ANSWER';
+    $datemsg='is in under construction';
+  }
+  return ($status,$datemsg);
+}
 
-    while (<$fh>) {
-      $a .=$_;
-    }
+sub showhash {
+  my (%hash) = @_;
+  my $resultkey;
+  foreach $resultkey (sort keys %hash) {
+    &Apache::lonxml::debug("$resultkey ---- $hash{$resultkey}");
   }
-  return $a
+  &Apache::lonxml::debug("\n<br />restored values^</br>\n");
+  return '';
 }
 
-sub handler {
-  my $request=shift;
+sub setuppermissions {
+  $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
+  $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
+  return ''
+}
 
-  $Apache::lonxml::debug=1;
+sub setupheader {
+  my $request=$_[0];
   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;
-
+  return OK if $request->header_only;
   &Apache::lonhomework::send_header($request);
-  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>");
-    $problem='';
+  return ''
+}
+
+sub renderpage {
+  my ($request,$file) = @_;
+
+  my (@targets) = &get_target();
+  foreach my $target (@targets) {
+    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') {
+      if (&Apache::lonnet::symbread() 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') { &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='';
+    }
+    $result = &Apache::lonxml::xmlparse($target, $problem,
+			$default.&setup_vars($target),%mystyle);
+
+    #$request->print("Result follows:");
+    if ($target eq 'modified') {
+      my $fileout = &Apache::lonnet::filelocation("",$request->uri);
+      my $filesave=$fileout.".bak";
+
+      my $fs=Apache::File->new(">$filesave");
+      print $fs $problem;
+      $request->print("<b>Making Backup to $filesave</b><br />");
+
+      my $fh=Apache::File->new(">$fileout");
+      print $fh $result;
+      $request->print("<b>Saving Modifications to $fileout</b><br />");
+    } else {
+      $request->print($result);
+    }
+    #$request->print(":Result ends");
+    if ($target eq 'grade') { &showhash(%Apache::lonhomework::results); }
+
+    #store new values
+    my ($temp) = keys %Apache::lonhomework::results;
+    if ( $temp ne '' ) {
+      &Apache::lonxml::debug("Store return message:".
+			     &Apache::lonnet::cstore(\%Apache::lonhomework::results));
+    }
   }
+}
 
-  my $result=&subhandler(&get_target(),$problem);
+sub handler {
+  my $request=$_[0];
 
-  #$request->print("Result follows:");
-  $request->print($result);
-  #$request->print(":Result ends");
+  if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
 
-  my $temp;
-  my $resultkey;
-  foreach $resultkey (sort keys %Apache::lonhomework::results) {
-    &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::results{$resultkey}");
+  if (&setupheader($request)) { return OK; }
+
+  #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:");
+
+  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;
+    }
   }
-  &Apache::lonxml::debug("\n<br>storing values^</br>\n");
 
-  &Apache::lonhomework::send_footer($request);
-  ($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 ( -e $file ) {
+      if (!(defined $ENV{'form.showproblem'})) {
+	#first visit to problem in construction space
+	&view_or_edit_menu($request);
+      } else {
+	&renderpage($request,$file);
+      }
+    } else {
+      # requested file doesn't exist in contruction space
+      &newproblem($request);
+    }
+  } else {
+    # just render the page normally outside of construction space
+    &renderpage($request,$file);
   }
-  return 'OK';
+
+  &Apache::lonhomework::send_footer($request);
+  # always turn off debug messages
+  $Apache::lonxml::debug=0;
+  return OK;
 
 }