--- loncom/homework/lonhomework.pm	2000/12/04 22:08:57	1.18
+++ loncom/homework/lonhomework.pm	2001/11/05 22:49:14	1.62
@@ -1,6 +1,7 @@
 # The LON-CAPA Homework handler
 # Guy Albertelli
 # 11/30 Gerd Kortemeyer
+# 6/1,8/17,8/18 Gerd Kortemeyer
 
 package Apache::lonhomework;
 use strict;
@@ -9,25 +10,48 @@ use Apache::lonxml;
 use Apache::lonnet;
 use Apache::inputtags;
 use Apache::structuretags;
+use Apache::randomlabel;
 use Apache::response;
+use Apache::hint;
+use Apache::outputtags;
+use Apache::Constants qw(:common);
+#use Time::HiRes qw( gettimeofday tv_interval );
 
+sub BEGIN {
+  &Apache::lonxml::register_insert();
+}
 
 sub get_target {
   if ( $ENV{'request.state'} eq "published") {
-    if ( defined $ENV{'form.submit'}) {
+    if ( defined($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.preview'})) {
+      if ( defined($ENV{'form.submitted'})) {
 	return ('grade', 'web');
       } else {
 	return ('web');
       }
     } else {
-      return ('edit');
+      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 ( $ENV{'form.submitted'} eq 'edit' ) {
+	  return ('modified','edit');
+	} else {
+	  return ('edit');
+	}
+      } else {
+	return ('web');
+      }
     }
   }
   return ();
@@ -42,89 +66,318 @@ sub setup_vars {
 sub send_header {
   my ($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());
 }
 
-sub handler {
-  my $request=$_[0];
+$Apache::lonxml::browse='';
 
-  $Apache::lonxml::debug=1;
-  
-  my (@targets) = &get_target();
+sub check_access {
+  my ($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) { $status = 'CANNOT_ANSWER'; } 
+  }
+
+  if (($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';
+    $datemsg='is closed but you are allowed to view it';
+  }
+  if ($ENV{'request.state'} eq "construct") {
+    &Apache::lonxml::debug("in construction ignoring dates");
+    $status='CAN_ANSWER';
+    $datemsg='is in under construction';
+  }
+  return ($status,$datemsg);
+}
+
+sub showhash {
+  my (%hash) = @_;
+  my $resultkey;
+  foreach $resultkey (sort keys %hash) {
+    &Apache::lonxml::debug("$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 {
     $request->content_type('text/html');
   }
+  &Apache::loncommon::no_cache($request);
   $request->send_http_header;
-  return 'OK' if $request->header_only;
-  
-  &Apache::lonhomework::send_header($request);
-  
+  return OK if $request->header_only;
+  return ''
+}
+
+sub handle_save_or_undo {
+  my ($request,$problem,$result) = @_;
+  my $fileout = &Apache::lonnet::filelocation("",$request->uri);
+  my $filesave=$fileout.".bak";
+
+  if ($ENV{'form.Undo'} eq 'undo') {
+    if (copy($filesave,$fileout)) {
+      $request->print("<b>Undid changes, Copied $filesave to $fileout<br /></b>");
+    } else {
+      $request->print("<font color=\"red\" size=\"+1\"><b>Unable to undo, unable to copy $filesave to $fileout<br /></b></font>");
+    }
+  } else {
+    my $fs=Apache::File->new(">$filesave");
+    if (defined($fs)) {
+      print $fs $$problem;
+      $request->print("<b>Making Backup to $filesave</b><br />");
+    } else {
+      $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filesave</b></font>");
+    }
+    my $fh=Apache::File->new(">$fileout");
+    if (defined($fh)) {
+      print $fh $$result;
+      $request->print("<b>Saving Modifications to $fileout</b><br />");
+    } else {
+      $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $fileout</b></font>");
+    }
+  }
+}
+
+sub renderpage {
+  my ($request,$file) = @_;
+
+  my (@targets) = &get_target();
   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 'grade') {
-      my $resultkey;
-      foreach $resultkey (sort keys %Apache::lonhomework::history) {
-	&Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::history{$resultkey}");
+    &Apache::edit::initialize_edit;
+    if ($target eq 'web') {
+      if (&Apache::lonnet::symbread() eq '') {
+	if ($ENV{'request.state'} eq "construct") {
+	} else {
+	  $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");
+	}
       }
-      &Apache::lonxml::debug("\n<br>restored values^</br>\n");
+      #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
     }
+    if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }
+
     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='';
     }
-    if ( $target eq 'grade') { 
-      $Apache::lonxml::textredirection = 0; 
-    } else {
-      $Apache::lonxml::textredirection = 1; 
-    }
     $result = &Apache::lonxml::xmlparse($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 {
+      #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 $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");
+    #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 $result;
+  &Apache::lonxml::debug("Looking for :$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($request,$file);
+  } else {
+    my $templatelist=&get_template_list('',$extension);
+    my $url=$request->uri;
+    my $dest = &Apache::lonnet::filelocation("",$request->uri);
+    $request->print(<<ENDNEWPROBLEM);
+<body bgcolor="#FFFFFF">
+The request 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:");
+
+  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
+      $request->internal_redirect('/adm/ambiguous'); return;
     }
   }
-  &Apache::lonhomework::send_footer($request);
-  
-  return 'OK';
+
+  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);
+	#&renderpage($request,$file);
+      } else {
+	&renderpage($request,$file);
+      }
+    } else {
+      # requested file doesn't exist in contruction space
+      &newproblem($request);
+    }
+  } else {
+    # just render the page normally outside of construction space
+    &renderpage($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;
 
 }