--- loncom/interface/slotrequest.pm	2005/05/31 21:13:01	1.2
+++ loncom/interface/slotrequest.pm	2006/02/03 18:53:08	1.42
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler for requesting to have slots added to a students record
 #
-# $Id: slotrequest.pm,v 1.2 2005/05/31 21:13:01 albertel Exp $
+# $Id: slotrequest.pm,v 1.42 2006/02/03 18:53:08 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -34,24 +34,28 @@ use Apache::Constants qw(:common :http :
 use Apache::loncommon();
 use Apache::lonlocal;
 use Apache::lonnet;
+use Date::Manip;
 
 sub fail {
     my ($r,$code)=@_;
     if ($code eq 'not_valid') {
-	$r->print('<p>'.&mt('Unable to understand what resource you wanted to sign up for.').'</p>'.$env{'form.symb'});
+	$r->print('<p>'.&mt('Unable to understand what resource you wanted to sign up for.').'</p>');
 
+    } elsif ($code eq 'not_allowed') {
+	$r->print('<p>'.&mt('Not allowed to sign up or change reservations at this time.').'</p>');
+    } else {
+	$r->print('<p>'.&mt('Failed.').'</p>');
     }
-    $r->print('<p><a href="/adm/flip?postdata=return:">'.
-	      &mt('Return to last resource').'</a></p>');
+    
+    &return_link($r);
     &end_page($r);
 }
 
 sub start_page {
-    my ($r)=@_;
+    my ($r,$title)=@_;
     my $html=&Apache::lonxml::xmlbegin();
-    $r->print($html.'<head><title>'.
-	      &mt('Request another Worktime').'</title></head>');
-    $r->print(&Apache::loncommon::bodytag('Requesting another Worktime'));
+    $r->print($html.'<head><title>'.&mt($title).'</title></head>');
+    $r->print(&Apache::loncommon::bodytag($title));
 }
 
 sub end_page {
@@ -84,7 +88,9 @@ sub get_reservation_ids {
 
     my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
 				       "^$slot_name\0");
-    
+    if (&network_error(%consumed)) { 
+	return 'error: Unable to determine current status';
+    }
     my ($tmp)=%consumed;
     if ($tmp=~/^error: 2 / ) {
 	return 0;
@@ -104,16 +110,113 @@ sub space_available {
     }
     return 0;
 }
- 
+
+sub check_for_reservation {
+    my ($symb)=@_;
+    my $student = &Apache::lonnet::EXT("resource.0.availablestudent", $symb,
+				       $env{'user.domain'}, $env{'user.name'});
+
+    my $course = &Apache::lonnet::EXT("resource.0.available", $symb,
+				    $env{'user.domain'}, $env{'user.name'});
+    my @slots = (split(/:/,$student), split(/:/, $course));
+
+    &Apache::lonxml::debug(" slot list is ".join(':',@slots));
+
+    my ($cnum,$cdom)=&get_course();
+    my %slots=&Apache::lonnet::get('slots', [@slots], $cdom, $cnum);
+
+    if (&network_error($student) || &network_error($course)  ||
+	&network_error(%slots)) {
+	return 'error: Unable to determine current status';
+    }    
+    foreach my $slot_name (@slots) {
+	next if (!defined($slots{$slot_name}) ||
+		 !ref($slots{$slot_name}));
+	&Apache::lonxml::debug(time." $slot_name ".
+			       $slots{$slot_name}->{'starttime'}." -- ".
+			       $slots{$slot_name}->{'startreserve'});
+	if ($slots{$slot_name}->{'endtime'} > time &&
+	    $slots{$slot_name}->{'startreserve'} < time) {
+	    # between start of reservation times and end of slot
+	    return($slot_name, $slots{$slot_name});
+	}
+    }
+    return (undef,undef);
+}
+
+sub check_for_conflict {
+    my ($symb,$new_slot_name)=@_;
+    my $student = &Apache::lonnet::EXT("resource.0.availablestudent", $symb,
+				       $env{'user.domain'}, $env{'user.name'});
+    my $course = &Apache::lonnet::EXT("resource.0.available", $symb,
+				      $env{'user.domain'}, $env{'user.name'});
+    my @slots = (split(/:/,$student), split(/:/, $course));
+    my ($cnum,$cdom)=&get_course();
+    my %slots=&Apache::lonnet::get('slots', [@slots], $cdom, $cnum);
+
+    if (&network_error($student) || &network_error($course)  ||
+	&network_error(%slots)) {
+	return 'error: Unable to determine current status';
+    }    
+    foreach my $slot_name (@slots) {
+	next if (!defined($slots{$slot_name}) ||
+		 !ref($slots{$slot_name}));
+
+        next if (!defined($slots{$slot_name}->{'uniqueperiod'}) ||
+		 !ref($slots{$slot_name}->{'uniqueperiod'}));
+	my ($start,$end)=@{$slots{$slot_name}->{'uniqueperiod'}};
+	if ($start<time && time < $end) {
+	    return $slot_name;
+	}
+    }
+    return undef;
+
+}
+
+sub network_error {
+    my ($result) = @_;
+    if ($result =~ /^(con_lost|no_such_host|error: [^2])/) {
+	return 1;
+    }
+    return 0;
+}
+
 sub make_reservation {
     my ($slot_name,$slot,$symb)=@_;
-    my $max=$slot->{'maxspace'};
 
-    if (!defined($max)) { return 1; }
+    my ($cnum,$cdom)=&get_course();
 
-    my (@ids)=&get_reservation_ids($slot_name);
+    my $value=&Apache::lonnet::EXT("resource.0.availablestudent",$symb,
+				   $env{'user.domain'},$env{'user.name'});
+    &Apache::lonxml::debug("value is  $value<br />");
+    if (&network_error($value)) { 
+	return 'error: Unable to determine current status';
+    }
+
+    foreach my $other_slot (split(/:/, $value)) {
+	if ($other_slot eq $slot_name) {
+	    my %consumed=&Apache::lonnet::dump('slot_reservations', $cdom,
+					       $cnum, "^$slot_name\0");   
+	    if (&network_error($value)) { 
+		return 'error: Unable to determine current status';
+	    }
+	    my $me=$env{'user.name'}.'@'.$env{'user.domain'};
+	    foreach my $key (keys(%consumed)) {
+		if ($consumed{$key}->{'name'} eq $me) {
+		    my $num=(split('\0',$key))[1];
+		    return -$num;
+		}
+	    }
+	}
+    }
+
+    my $max=$slot->{'maxspace'};
+    if (!defined($max)) { $max=99999; }
 
-    # FIXME we could end up having holes... 
+    my (@ids)=&get_reservation_ids($slot_name);
+    if (&network_error(@ids)) { 
+	return 'error: Unable to determine current status';
+    }
     my $last=0;
     foreach my $id (@ids) {
 	my $num=(split('\0',$id))[1];
@@ -121,50 +224,328 @@ sub make_reservation {
     }
     
     my $wanted=$last+1;
-    if ($wanted >= $max) {
+    &Apache::lonxml::debug("wanted $wanted<br />");
+    if (scalar(@ids) >= $max) {
 	# full up
-	return -1;
+	return undef;
     }
     
     my %reservation=('name'      => $env{'user.name'}.'@'.$env{'user.domain'},
 		     'timestamp' => time,
 		     'symb'      => $symb);
 
-    my ($cnum,$cdom)=&get_course();
     my $success=&Apache::lonnet::newput('slot_reservations',
 					{"$slot_name\0$wanted" =>
 					     \%reservation},
-					$cdom,$cnum);
+					$cdom, $cnum);
+
     if ($success eq 'ok') {
+	my $new_value=$slot_name;
+	if ($value) {
+	    $new_value=$value.':'.$new_value;
+	}
+	my $result=&Apache::lonparmset::storeparm_by_symb($symb,
+						      '0_availablestudent',
+						       1, $new_value, 'string',
+						       $env{'user.name'},
+					               $env{'user.domain'});
+	&Apache::lonxml::debug("hrrm $result");
 	return $wanted;
     }
+
     # someone else got it
-    return -1;
+    return undef;
 }
 
+sub remove_registration {
+    my ($r) = @_;
+    my $name = &Apache::loncommon::plainname($env{'form.uname'},
+					     $env{'form.udom'});
+
+    my $title = &Apache::lonnet::gettitle($env{'form.symb'});
+
+    my $hidden_input;
+    foreach my $parm ('uname','udom','slotname','entry','symb') {
+	$hidden_input .=
+	    '<input type="hidden" name="'.$parm.'" value="'
+	    .&HTML::Entities::encode($env{'form.'.$parm},'"<>&\'').'" />'."\n";
+    }
+    $r->print(<<"END_CONFIRM");
+<p> Remove $name from slot $env{'form.slotname'} for $title</p>
+<form action="/adm/slotrequest" method="POST">
+    <input type="hidden" name="command" value="release" />
+    $hidden_input
+    <input type="submit" name="Yes" value="yes" />
+</form>
+<form action="/adm/slotrequest" method="POST">
+    <input type="hidden" name="command" value="showslots" />
+    <input type="submit" name="No" value="no" />
+</form>
+END_CONFIRM
+
+}
+
+sub release_slot {
+    my ($r,$symb,$slot_name,$inhibit_return_link,$mgr)=@_;
+
+    if ($slot_name eq '') { $slot_name=$env{'form.slotname'}; }
+    my ($cnum,$cdom)=&get_course();
+
+    my ($uname,$udom) = ($env{'user.name'}, $env{'user.domain'});
+    if ($mgr eq 'F' 
+	&& defined($env{'form.uname'}) && defined($env{'form.udom'})) {
+	($uname,$udom) = ($env{'form.uname'}, $env{'form.udom'});
+    }
+
+    if ($mgr eq 'F' 
+	&& defined($env{'form.symb'})) {
+	$symb = $env{'form.symb'};
+    }
+    my %slot=&Apache::lonnet::get_slot($slot_name);
+    my $description=&get_description($env{'form.slotname'},\%slot);
+
+    if ($mgr ne 'F') {
+	if ($slot{$slot_name}{'starttime'} < time) {
+	    $r->print("<p>Not allowed to release Reservation: $description, as it has already ended.</p>");
+	    &return_link($r);
+	    return 0;
+	}
+    }
+    # get parameter string, check for existance, rebuild string with the slot
+    my @slots = split(/:/,&Apache::lonnet::EXT("resource.0.availablestudent",
+					       $symb,$udom,$uname));
+
+    my @new_slots;
+    foreach my $exist_slot (@slots) {
+	if ($exist_slot eq $slot_name) { next; }
+	push(@new_slots,$exist_slot);
+    }
+    my $new_param = join(':',@new_slots);
+
+    # get slot reservations, check if user has one, if so remove reservation
+    my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
+				       "^$slot_name\0");
+    foreach my $entry (keys(%consumed)) {
+	if ( $consumed{$entry}->{'name'} eq ($uname.'@'.$udom) ) {
+	    &Apache::lonnet::del('slot_reservations',[$entry],
+				 $cdom,$cnum);
+	}
+    }
+
+    # store new parameter string
+    my $result=&Apache::lonparmset::storeparm_by_symb($symb,
+						      '0_availablestudent',
+						      1, $new_param, 'string',
+						      $uname,$udom);
+    my $description=&get_description($env{'form.slotname'},\%slot);
+    $r->print("<p>Released Reservation: $description</p>");
+    if ($mgr eq 'F') {
+	$r->print('<p><a href="/adm/slotrequest?command=showslots">'.
+		  &mt('Return to slot list').'</a></p>');
+    }
+    if (!$inhibit_return_link) { &return_link($r);  }
+    return 1;
+}
+
+sub delete_slot {
+    my ($r)=@_;
+
+    my $slot_name = $env{'form.slotname'};
+    my %slot=&Apache::lonnet::get_slot($slot_name);
+
+    my ($cnum,$cdom)=&get_course();
+    my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
+				       "^$slot_name\0");
+    my ($tmp) = %consumed;
+    if ($tmp =~ /error: 2/) { undef(%consumed); }
+
+    if (%slot && !%consumed) {
+	$slot{'type'} = 'deleted';
+	my $ret = &Apache::lonnet::cput('slots', {$slot_name => \%slot},
+					$cdom, $cnum);
+	if ($ret eq 'ok') {
+	    $r->print("<p>Slot <tt>$slot_name</tt> marked as deleted.</p>");
+	} else {
+	    $r->print("<p> An error ($ret) occurse when attempting to delete Slot <tt>$slot_name</tt>.</p>");
+	}
+    } else {
+	if (%consumed) {
+	    $r->print("<p>Slot <tt>$slot_name</tt> has active reservations.</p>");
+	} else {
+	    $r->print("<p>Slot <tt>$slot_name</tt> does not exist.</p>");
+	}
+    }
+    $r->print('<p><a href="/adm/slotrequest?command=showslots">'.
+	      &mt('Return to slot list').'</a></p>');
+    &return_link($r);
+}
+
+sub return_link {
+    my ($r) = @_;
+    $r->print('<p><a href="/adm/flip?postdata=return:">'.
+	      &mt('Return to last resource').'</a></p>');
+}
+
+sub get_slot {
+    my ($r,$symb)=@_;
+
+    my $slot_name=&check_for_conflict($symb,$env{'form.slotname'});
+
+    if ($slot_name =~ /^error: (.*)/) {
+	$r->print("<p>An error occured while attempting to make a reservation. ($1)</p>");
+	&return_link($r);
+	return;
+    }
+    if ($slot_name) {
+	my %slot=&Apache::lonnet::get_slot($slot_name);
+	my $description1=&get_description($slot_name,\%slot);
+	%slot=&Apache::lonnet::get_slot($env{'form.slotname'});
+	my $description2=&get_description($env{'form.slotname'},\%slot);
+	$r->print("<p>Already have a reservation: $description1</p>");
+	if ($slot_name ne $env{'form.slotname'}) {
+	    $r->print(<<STUFF);
+<form method="POST" action="/adm/slotrequest">
+   <input type="hidden" name="symb" value="$env{'form.symb'}" />
+   <input type="hidden" name="slotname" value="$env{'form.slotname'}" />
+   <input type="hidden" name="releaseslot" value="$slot_name" />
+   <input type="hidden" name="command" value="change" />
+STUFF
+            $r->print("<p>You can either ");
+	    $r->print(<<STUFF);
+   <input type="submit" name="change" value="Change" />
+STUFF
+	    $r->print(' your reservation from <b>'.$description1.'</b> to <b>'.
+		      $description2.
+		      '</b> <br />or </p>');
+	    &return_link($r);
+	    $r->print(<<STUFF);
+</form>
+STUFF
+        } else {
+	    &return_link($r);
+	}
+	return;
+    }
+    my %slot=&Apache::lonnet::get_slot($env{'form.slotname'});
+    my $reserved=&make_reservation($env{'form.slotname'},
+				   \%slot,$symb);
+    my $description=&get_description($env{'form.slotname'},\%slot);
+    if (defined($reserved)) {
+	if ($slot_name =~ /^error: (.*)/) {
+	    $r->print("<p>An error occured while attempting to make a reservation. ($1)</p>");
+	} elsif ($reserved > -1) {
+	    $r->print("<p>Success: $description</p>");
+	} elsif ($reserved < 0) {
+	    $r->print("<p>Already reserved: $description</p>");
+	}
+	&return_link($r);
+	return;
+    }
+
+    my %lt=('request'=>"Availibility list",
+	    'try'    =>'Try again');
+    %lt=&Apache::lonlocal::texthash(%lt);
+
+    $r->print(<<STUFF);
+<p> <font color="red">Failed</font> to reserve a spot for $description. </p>
+<p>
+<form method="POST" action="/adm/slotrequest">
+   <input type="submit" name="Try Again" value="$lt{'try'}" />
+   <input type="hidden" name="symb" value="$env{'form.symb'}" />
+   <input type="hidden" name="slotname" value="$env{'form.slotname'}" />
+   <input type="hidden" name="command" value="get" />
+</form>
+?
+</p>
+<p>
+or
+<form method="POST" action="/adm/slotrequest">
+    <input type="hidden" name="symb" value="$env{'form.symb'}" />
+    <input type="submit" name="requestattempt" value="$lt{'request'}" />
+</form>
+</p>
+or
+STUFF
+
+    &return_link($r);
+    return;
+}
+
+sub allowed_slot {
+    my ($slot_name,$slot,$symb)=@_;
+    #already started
+    if ($slot->{'starttime'} < time) {
+	# all open slot to be schedulable
+	#return 0;
+    }
+    &Apache::lonxml::debug("$slot_name starttime good");
+    #already ended
+    if ($slot->{'endtime'} < time) {
+	return 0;
+    }
+    &Apache::lonxml::debug("$slot_name endtime good");
+    # not allowed to pick this one
+    if (defined($slot->{'type'})
+	&& $slot->{'type'} ne 'schedulable_student') {
+	return 0;
+    }
+    &Apache::lonxml::debug("$slot_name type good");
+    # not allowed for this resource
+    if (defined($slot->{'symb'})
+	&& $slot->{'symb'} ne $symb) {
+	return 0;
+    }
+    &Apache::lonxml::debug("$slot_name symb good");
+    return 1;
+}
+
+sub get_description {
+    my ($slot_name,$slot)=@_;
+    my $description=$slot->{'description'};
+    if (!defined($description)) {
+	$description=&mt('[_1] From [_2] to [_3]',$slot_name,
+			 &Apache::lonlocal::locallocaltime($slot->{'starttime'}),
+			 &Apache::lonlocal::locallocaltime($slot->{'endtime'}));
+    }
+    return $description;
+}
 
 sub show_choices {
     my ($r,$symb)=@_;
 
     my ($cnum,$cdom)=&get_course();
     my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
+    my $available;
     $r->print('<table border="1">');
+    &Apache::lonxml::debug("Checking Slots");
+    my ($got_slot)=&check_for_reservation($symb);
     foreach my $slot (sort 
 		      { return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'} }
 		      (keys(%slots)))  {
-	my $description=$slots{$slot}->{'description'};
-	if (!defined($description)) {
-	    $description=&mt('[_1] From [_2] to [_3]',$slot,
-			     &Apache::lonlocal::locallocaltime($slots{$slot}->{'starttime'}),
-			     &Apache::lonlocal::locallocaltime($slots{$slot}->{'endtime'}));
-	}
+
+	&Apache::lonxml::debug("Checking Slot $slot");
+	next if (!&allowed_slot($slot,$slots{$slot}));
+
+	$available++;
+
+	my $description=&get_description($slot,$slots{$slot});
 
 	my $form=&mt('Unavailable');
-	if (&space_available($slot,$slots{$slot})) {
+	if (($slot eq $got_slot) ||
+	    &space_available($slot,$slots{$slot},$symb)) {
+	    my $text=&mt('Select');
+	    my $command='get';
+	    if ($slot eq $got_slot) {
+		$text=&mt('Free Reservation');
+		$command='release';
+	    }
+	    my $escsymb=&Apache::lonnet::escape($symb);
 	    $form=<<STUFF;
-   <form>
-     <input type="submit" name="Select" value="Select" />
-     <!-- FIXME needs to send data -->
+   <form method="POST" action="/adm/slotrequest">
+     <input type="submit" name="Select" value="$text" />
+     <input type="hidden" name="symb" value="$escsymb" />
+     <input type="hidden" name="slotname" value="$slot" />
+     <input type="hidden" name="command" value="$command" />
    </form>
 STUFF
 	}
@@ -175,24 +556,656 @@ STUFF
 </tr>
 STUFF
     }
+
+    if (!$available) {
+	$r->print('<tr><td>No available times. <a href="/adm/flip?postdata=return:">'.
+		  &mt('Return to last resource').'</a></td></tr>');
+    }
+    $r->print('</table>');
+}
+
+sub to_show {
+    my ($slot,$when,$deleted) = @_;
+    my $time=time;
+    my $week=60*60*24*7;
+    if ($deleted eq 'hide' && $slot->{'type'} eq 'deleted') {
+	return 0;
+    }
+    if ($when eq 'any') {
+	return 1;
+    } elsif ($when eq 'now') {
+	if ($time > $slot->{'starttime'} &&
+	    $time < $slot->{'endtime'}) {
+	    return 1;
+	}
+	return 0;
+    } elsif ($when eq 'nextweek') {
+	if ( ($time        < $slot->{'starttime'} &&
+	      ($time+$week) > $slot->{'starttime'})
+	     ||
+	     ($time        < $slot->{'endtime'} &&
+	      ($time+$week) > $slot->{'endtime'}) ) {
+	    return 1;
+	}
+	return 0;
+    } elsif ($when eq 'lastweek') {
+	if ( ($time        > $slot->{'starttime'} &&
+	      ($time-$week) < $slot->{'starttime'})
+	     ||
+	     ($time        > $slot->{'endtime'} &&
+	      ($time-$week) < $slot->{'endtime'}) ) {
+	    return 1;
+	}
+	return 0;
+    } elsif ($when eq 'willopen') {
+	if ($time < $slot->{'starttime'}) {
+	    return 1;
+	}
+	return 0;
+    } elsif ($when eq 'wereopen') {
+	if ($time > $slot->{'endtime'}) {
+	    return 1;
+	}
+	return 0;
+    }
+    
+    return 1;
+}
+
+sub remove_link {
+    my ($slotname,$entry,$uname,$udom,$symb) = @_;
+
+    $slotname  = &Apache::lonnet::escape($slotname);
+    $entry     = &Apache::lonnet::escape($entry);
+    $uname     = &Apache::lonnet::escape($uname);
+    $udom      = &Apache::lonnet::escape($udom);
+    $symb      = &Apache::lonnet::escape($symb);
+
+    my $remove= &mt('Remove');
+
+    return <<"END_LINK";
+ <a href="/adm/slotrequest?command=remove_registration&slotname=$slotname&entry=$entry&uname=$uname&udom=$udom&symb=$symb"
+   >($remove)</a>
+END_LINK
+
+}
+
+sub show_table {
+    my ($r,$mgr)=@_;
+
+    my ($cnum,$cdom)=&get_course();
+    my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
+    if ( (keys(%slots))[0] =~ /^error: 2 /) {
+	undef(%slots);
+    } 
+    my $available;
+    if ($mgr eq 'F') {
+	$r->print('<div>');
+	$r->print('<form method="POST" action="/adm/slotrequest">
+<input type="hidden" name="command" value="uploadstart" />
+<input type="submit" name="start" value="'.&mt('Upload Slot List').'" />
+</form>');
+	$r->print('<form method="POST" action="/adm/helper/newslot.helper">
+<input type="submit" name="newslot" value="'.&mt('Create a New Slot').'" />
+</form>');
+	$r->print('</div>');
+    }
+    
+    my %Saveable_Parameters = ('show'    => 'array',
+			       'when'    => 'scalar',
+			       'order'   => 'scalar',
+			       'deleted' => 'scalar',
+			       );
+    &Apache::loncommon::store_course_settings('slotrequest',\%Saveable_Parameters);
+    &Apache::loncommon::restore_course_settings('slotrequest',\%Saveable_Parameters);
+
+    my %show_fields=&Apache::lonlocal::texthash(
+	     'name'         => 'Slot Name',
+	     'description'  => 'Description',
+	     'type'         => 'Type',
+	     'starttime'    => 'Start time',
+	     'endtime'      => 'End Time',
+             'startreserve' => 'Time students can start reserving',
+	     'secret'       => 'Secret Word',
+	     'maxspace'     => 'Maximum # of students',
+	     'ip'           => 'IP or DNS restrictions',
+	     'symb'         => 'Resource slot is restricted to.',
+	     'uniqueperiod' => 'Period of time slot is unique',
+	     'proctor'      => 'List of proctors');
+    my @show_order=('name','description','type','starttime','endtime',
+	       'startreserve','secret','maxspace','ip','symb',
+	       'uniqueperiod','proctor');
+    my @show = 
+	(exists($env{'form.show'})) ? &Apache::loncommon::get_env_multiple('form.show')
+	                            : keys(%show_fields);
+    my %show =  map { $_ => 1 } (@show);
+
+    my %when_fields=&Apache::lonlocal::texthash(
+	     'now'      => 'Open now',
+	     'nextweek' => 'Open within the next week',
+	     'lastweek' => 'Were open last week',
+	     'willopen' => 'Will open later',
+	     'wereopen' => 'Were open',
+	     'any'      => 'Anytime',
+						);
+    my @when_order=('any','now','nextweek','lastweek','willopen','wereopen');
+    $when_fields{'select_form_order'} = \@when_order;
+    my $when = 	(exists($env{'form.when'})) ? $env{'form.when'}
+                                            : 'now';
+
+    my $hide_radio = 
+	&Apache::lonhtmlcommon::radio('deleted',$env{'form.deleted'},'hide');
+    my $show_radio = 
+	&Apache::lonhtmlcommon::radio('deleted',$env{'form.deleted'},'show');
+	
+    $r->print('<form method="POST" action="/adm/slotrequest">
+<input type="hidden" name="command" value="showslots" />');
+    $r->print('<div>');
+    $r->print('<table class="inline">
+      <tr><th>'.&mt('Show').'</th>
+          <th>'.&mt('Open').'</th>
+          <th>'.&mt('Options').'</th>
+      </tr>
+      <tr><td>'.&Apache::loncommon::multiple_select_form('show',\@show,6,\%show_fields,\@show_order).
+	      '</td>
+           <td>'.&Apache::loncommon::select_form($when,'when',%when_fields).
+          '</td>
+           <td>
+            <table>
+              <tr>
+                <td rowspan="2">Deleted slots:</td>
+                <td><label>'.$show_radio.'Show</label></td>
+              </tr>
+              <tr>
+                <td><label>'.$hide_radio.'Hide</label></td>
+              </tr>
+            </table>
+	  </td>
+       </tr>
+    </table>');
+    $r->print('</div>');
+    $r->print('<p><input type="submit" name="start" value="'.&mt('Update Display').'" /></p>');
+    my $linkstart='<a href="/adm/slotrequest?command=showslots&amp;order=';
+    $r->print('<table class="thinborder">
+<tr>
+  <th></th>');
+    foreach my $which (@show_order) {
+	if ($which ne 'proctor' && exists($show{$which})) {
+	    $r->print('<th>'.$linkstart.$which.'">'.$show_fields{$which}.'</a></th>');
+	}
+    }
+    $r->print('<th>Scheduled Students</th></tr>');
+
+    my %name_cache;
+    my $slotsort = sub {
+	if ($env{'form.order'}=~/^(type|description|endtime|startreserve|maxspace|ip|symb)$/) {
+	    if (lc($slots{$a}->{$env{'form.order'}})
+		ne lc($slots{$b}->{$env{'form.order'}})) {
+		return (lc($slots{$a}->{$env{'form.order'}}) 
+			cmp lc($slots{$b}->{$env{'form.order'}}));
+	    }
+	} elsif ($env{'form.order'} eq 'name') {
+	    if (lc($a) cmp lc($b)) {
+		return lc($a) cmp lc($b);
+	    }
+	} elsif ($env{'form.order'} eq 'uniqueperiod') {
+	    
+	    if ($slots{$a}->{'uniqueperiod'}[0] 
+		ne $slots{$b}->{'uniqueperiod'}[0]) {
+		return ($slots{$a}->{'uniqueperiod'}[0]
+			cmp $slots{$b}->{'uniqueperiod'}[0]);
+	    }
+	    if ($slots{$a}->{'uniqueperiod'}[1] 
+		ne $slots{$b}->{'uniqueperiod'}[1]) {
+		return ($slots{$a}->{'uniqueperiod'}[1]
+			cmp $slots{$b}->{'uniqueperiod'}[1]);
+	    }
+	}
+	return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'};
+    };
+    foreach my $slot (sort $slotsort (keys(%slots)))  {
+	if (!&to_show($slots{$slot},$when,$env{'form.deleted'})) { next; }
+	if (defined($slots{$slot}->{'type'})
+	    && $slots{$slot}->{'type'} ne 'schedulable_student') {
+	    #next;
+	}
+	my $description=&get_description($slot,$slots{$slot});
+	my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
+					   "^$slot\0");
+	my $ids;
+
+	my ($tmp)=%consumed;
+	if ($tmp !~ /^error: /) {
+	    foreach my $entry (sort(keys(%consumed))) {
+		my (undef,$id)=split("\0",$entry);
+		my ($uname,$udom) = split('@',$consumed{$entry}{'name'});
+		my $name = &Apache::loncommon::plainname($uname,$udom);
+		$ids.= '<nobr>'.$name.&remove_link($slot,$entry,$uname,$udom,
+						   $consumed{$entry}{'symb'})
+		    .'</nobr><br />';
+	    }
+	}
+
+	my $start=($slots{$slot}->{'starttime'}?
+		   &Apache::lonlocal::locallocaltime($slots{$slot}->{'starttime'}):'');
+	my $end=($slots{$slot}->{'endtime'}?
+		 &Apache::lonlocal::locallocaltime($slots{$slot}->{'endtime'}):'');
+	my $start_reserve=($slots{$slot}->{'startreserve'}?
+			   &Apache::lonlocal::locallocaltime($slots{$slot}->{'startreserve'}):'');
+	
+	my $unique;
+	if (ref($slots{$slot}{'uniqueperiod'})) {
+	    $unique=localtime($slots{$slot}{'uniqueperiod'}[0]).','.
+		localtime($slots{$slot}{'uniqueperiod'}[1]);
+	}
+
+	my $title;
+	if (exists($slots{$slot}{'symb'})) {
+	    my (undef,undef,$res)=
+		&Apache::lonnet::decode_symb($slots{$slot}{'symb'});
+	    $res =   &Apache::lonnet::clutter($res);
+	    $title = &Apache::lonnet::gettitle($slots{$slot}{'symb'});
+	    $title='<a href="'.$res.'?symb='.$slots{$slot}{'symb'}.'">'.$title.'</a>';
+	}
+
+	my @proctors;
+	my $rowspan=1;
+	my $colspan=1;
+	if (exists($show{'proctor'})) {
+	    $rowspan=2;
+	    @proctors= map {
+		my ($uname,$udom)=split(/@/,$_);
+		my $fullname=$name_cache{$_};
+		if (!defined($fullname)) {
+		    &Apache::lonnet::logthis("Gettign $uname $udom");
+		    $fullname = &Apache::loncommon::plainname($uname,$udom);
+		    $fullname =~s/\s/&nbsp;/g;
+		    $name_cache{$_} = $fullname;
+		}
+		&Apache::loncommon::aboutmewrapper($fullname,$uname,$udom);
+	    } (sort(split(/\s*,\s*/,$slots{$slot}->{'proctor'})));
+	}
+	my $proctors=join(', ',@proctors);
+
+	my $edit=(<<"EDITLINK");
+<a href="/adm/helper/newslot.helper?name=$slot">Edit</a>
+EDITLINK
+
+	my $delete=(<<"DELETELINK");
+<a href="/adm/slotrequest?command=delete&slotname=$slot">Delete</a>
+DELETELINK
+        if ($ids ne '') { undef($delete); }
+
+        $r->print("<tr>\n<td rowspan=\"$rowspan\">$edit $delete</td>\n");
+	if (exists($show{'name'})) {
+	    $colspan++;$r->print("<td>$slot</td>");
+	}
+	if (exists($show{'description'})) {
+	    $colspan++;$r->print("<td>$description</td>\n");
+	}
+	if (exists($show{'type'})) {
+	    $colspan++;$r->print("<td>$slots{$slot}->{'type'}</td>\n");
+	}
+	if (exists($show{'starttime'})) {
+	    $colspan++;$r->print("<td>$start</td>\n");
+	}
+	if (exists($show{'endtime'})) {
+	    $colspan++;$r->print("<td>$end</td>\n");
+	}
+	if (exists($show{'startreserve'})) {
+	    $colspan++;$r->print("<td>$start_reserve</td>\n");
+	}
+	if (exists($show{'secret'})) {
+	    $colspan++;$r->print("<td>$slots{$slot}{'secret'}</td>\n");
+	}
+	if (exists($show{'maxspace'})) {
+	    $colspan++;$r->print("<td>$slots{$slot}{'maxspace'}</td>\n");
+	}
+	if (exists($show{'ip'})) {
+	    $colspan++;$r->print("<td>$slots{$slot}{'ip'}</td>\n");
+	}
+	if (exists($show{'symb'})) {
+	    $colspan++;$r->print("<td>$title</td>\n");
+	}
+	if (exists($show{'uniqueperiod'})) {
+	    $colspan++;$r->print("<td>$unique</td>\n");
+	}
+	$colspan++;$r->print("<td>$ids</td>\n</tr>\n");
+	if (exists($show{'proctor'})) {
+	    $r->print(<<STUFF);
+<tr>
+ <td colspan="$colspan">$proctors</td>
+</tr>
+STUFF
+        }
+    }
     $r->print('</table>');
 }
 
+sub upload_start {
+    my ($r)=@_;    
+    $r->print(&Apache::grades::checkforfile_js());
+    my $result.='<table width=100% border=0><tr bgcolor="#e6ffff"><td>'."\n";
+    $result.='&nbsp;<b>'.
+	&mt('Specify a file containing the slot definitions.').
+	'</b></td></tr>'."\n";
+    $result.='<tr bgcolor=#ffffe6><td>'."\n";
+    my $upfile_select=&Apache::loncommon::upfile_select_html();
+    my $ignore=&mt('Ignore First Line');
+    $result.=<<ENDUPFORM;
+<form method="post" enctype="multipart/form-data" action="/adm/slotrequest" name="slotupload">
+<input type="hidden" name="command" value="csvuploadmap" />
+$upfile_select
+<br /><input type="button" onClick="javascript:checkUpload(this.form);" value="Upload Data" />
+<label><input type="checkbox" name="noFirstLine" />$ignore</label>
+</form>
+ENDUPFORM
+    $result.='</td></tr></table>'."\n";
+    $result.='</td></tr></table>'."\n";
+    $r->print($result);
+}
+
+sub csvuploadmap_header {
+    my ($r,$datatoken,$distotal)= @_;
+    my $javascript;
+    if ($env{'form.upfile_associate'} eq 'reverse') {
+	$javascript=&csvupload_javascript_reverse_associate();
+    } else {
+	$javascript=&csvupload_javascript_forward_associate();
+    }
+
+    my $checked=(($env{'form.noFirstLine'})?' checked="checked"':'');
+    my $ignore=&mt('Ignore First Line');
+    $r->print(<<ENDPICK);
+<form method="post" enctype="multipart/form-data" action="/adm/slotrequest" name="slotupload">
+<h3>Identify fields</h3>
+Total number of records found in file: $distotal <hr />
+Enter as many fields as you can. The system will inform you and bring you back
+to this page if the data selected is insufficient to create the slots.<hr />
+<input type="button" value="Reverse Association" onClick="javascript:this.form.associate.value='Reverse Association';submit(this.form);" />
+<label><input type="checkbox" name="noFirstLine" $checked />$ignore</label>
+<input type="hidden" name="associate"  value="" />
+<input type="hidden" name="datatoken"  value="$datatoken" />
+<input type="hidden" name="fileupload" value="$env{'form.fileupload'}" />
+<input type="hidden" name="upfiletype" value="$env{'form.upfiletype'}" />
+<input type="hidden" name="upfile_associate" 
+                                       value="$env{'form.upfile_associate'}" />
+<input type="hidden" name="command"    value="csvuploadassign" />
+<hr />
+<script type="text/javascript" language="Javascript">
+$javascript
+</script>
+ENDPICK
+    return '';
+
+}
+
+sub csvuploadmap_footer {
+    my ($request,$i,$keyfields) =@_;
+    $request->print(<<ENDPICK);
+</table>
+<input type="hidden" name="nfields" value="$i" />
+<input type="hidden" name="keyfields" value="$keyfields" />
+<input type="button" onClick="javascript:verify(this.form)" value="Create Slots" /><br />
+</form>
+ENDPICK
+}
+
+sub csvupload_javascript_reverse_associate {
+    my $error1=&mt('You need to specify the name, starttime, endtime and a type');
+    return(<<ENDPICK);
+  function verify(vf) {
+    var foundstart=0;
+    var foundend=0;
+    var foundname=0;
+    var foundtype=0;
+    for (i=0;i<=vf.nfields.value;i++) {
+      tw=eval('vf.f'+i+'.selectedIndex');
+      if (i==0 && tw!=0) { foundname=1; }
+      if (i==1 && tw!=0) { foundtype=1; }
+      if (i==2 && tw!=0) { foundstat=1; }
+      if (i==3 && tw!=0) { foundend=1; }
+    }
+    if (foundstart==0 && foundend==0 && foundtype==0 && foundname==0) {
+	alert('$error1');
+	return;
+    }
+    vf.submit();
+  }
+  function flip(vf,tf) {
+  }
+ENDPICK
+}
+
+sub csvupload_javascript_forward_associate {
+    my $error1=&mt('You need to specify the name, starttime, endtime and a type');
+  return(<<ENDPICK);
+  function verify(vf) {
+    var foundstart=0;
+    var foundend=0;
+    var foundname=0;
+    var foundtype=0;
+    for (i=0;i<=vf.nfields.value;i++) {
+      tw=eval('vf.f'+i+'.selectedIndex');
+      if (tw==1) { foundname=1; }
+      if (tw==2) { foundtype=1; }
+      if (tw==3) { foundstat=1; }
+      if (tw==4) { foundend=1; }
+    }
+    if (foundstart==0 && foundend==0 && foundtype==0 && foundname==0) {
+	alert('$error1');
+	return;
+    }
+    vf.submit();
+  }
+  function flip(vf,tf) {
+  }
+ENDPICK
+}
+
+sub csv_upload_map {
+    my ($r)= @_;
+
+    my $datatoken;
+    if (!$env{'form.datatoken'}) {
+	$datatoken=&Apache::loncommon::upfile_store($r);
+    } else {
+	$datatoken=$env{'form.datatoken'};
+	&Apache::loncommon::load_tmp_file($r);
+    }
+    my @records=&Apache::loncommon::upfile_record_sep();
+    if ($env{'form.noFirstLine'}) { shift(@records); }
+    &csvuploadmap_header($r,$datatoken,$#records+1);
+    my ($i,$keyfields);
+    if (@records) {
+	my @fields=&csvupload_fields();
+
+	if ($env{'form.upfile_associate'} eq 'reverse') {	
+	    &Apache::loncommon::csv_print_samples($r,\@records);
+	    $i=&Apache::loncommon::csv_print_select_table($r,\@records,
+							  \@fields);
+	    foreach (@fields) { $keyfields.=$_->[0].','; }
+	    chop($keyfields);
+	} else {
+	    unshift(@fields,['none','']);
+	    $i=&Apache::loncommon::csv_samples_select_table($r,\@records,
+							    \@fields);
+	    my %sone=&Apache::loncommon::record_sep($records[0]);
+	    $keyfields=join(',',sort(keys(%sone)));
+	}
+    }
+    &csvuploadmap_footer($r,$i,$keyfields);
+
+    return '';
+}
+
+sub csvupload_fields {
+    return (['name','Slot name'],
+	    ['type','Type of slot'],
+	    ['starttime','Start Time of slot'],
+	    ['endtime','End Time of slot'],
+	    ['startreserve','Reservation Start Time'],
+	    ['ip','IP or DNS restriction'],
+	    ['proctor','List of proctor ids'],
+	    ['description','Slot Description'],
+	    ['maxspace','Maximum number of reservations'],
+	    ['symb','Resource Restriction'],
+	    ['uniqueperiod','Date range of slot exclusion'],
+	    ['secret','Secret word proctor uses to validate']);
+}
+
+sub csv_upload_assign {
+    my ($r,$mgr)= @_;
+    &Apache::loncommon::load_tmp_file($r);
+    my @slotdata = &Apache::loncommon::upfile_record_sep();
+    if ($env{'form.noFirstLine'}) { shift(@slotdata); }
+    my %fields=&Apache::grades::get_fields();
+    $r->print('<h3>Creating Slots</h3>');
+    my $cname=$env{'course.'.$env{'request.course.id'}.'.num'};
+    my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
+    my $countdone=0;
+    my @errors;
+    foreach my $slot (@slotdata) {
+	my %slot;
+	my %entries=&Apache::loncommon::record_sep($slot);
+	my $domain;
+	my $name=$entries{$fields{'name'}};
+	if ($name=~/^\s*$/) {
+	    push(@errors,"Did not create slot with no name");
+	    next;
+	}
+	if ($name=~/\s/) { 
+	    push(@errors,"$name not created -- Name must not contain spaces");
+	    next;
+	}
+	if ($name=~/\W/) { 
+	    push(@errors,"$name not created -- Name must contain only letters, numbers and _");
+	    next;
+	}
+	if ($entries{$fields{'type'}}) {
+	    $slot{'type'}=$entries{$fields{'type'}};
+	} else {
+	    $slot{'type'}='preassigned';
+	}
+	if ($slot{'type'} ne 'preassigned' &&
+	    $slot{'type'} ne 'schedulable_student') {
+	    push(@errors,"$name not created -- invalid type ($slot{'type'}) must be either preassigned or schedulable_student");
+	    next;
+	}
+	if ($entries{$fields{'starttime'}}) {
+	    $slot{'starttime'}=&UnixDate($entries{$fields{'starttime'}},"%s");
+	}
+	if ($entries{$fields{'endtime'}}) {
+	    $slot{'endtime'}=&UnixDate($entries{$fields{'endtime'}},"%s");
+	}
+	if ($entries{$fields{'startreserve'}}) {
+	    $slot{'startreserve'}=
+		&UnixDate($entries{$fields{'startreserve'}},"%s");
+	}
+	foreach my $key ('ip','proctor','description','maxspace',
+			 'secret','symb') {
+	    if ($entries{$fields{$key}}) {
+		$slot{$key}=$entries{$fields{$key}};
+	    }
+	}
+	if ($entries{$fields{'uniqueperiod'}}) {
+	    my ($start,$end)=split(',',$entries{$fields{'uniqueperiod'}});
+	    my @times=(&UnixDate($start,"%s"),
+		       &UnixDate($end,"%s"));
+	    $slot{'uniqueperiod'}=\@times;
+	}
+
+	&Apache::lonnet::cput('slots',{$name=>\%slot},$cdom,$cname);
+	$r->print('.');
+	$r->rflush();
+	$countdone++;
+    }
+    $r->print("<p>Created $countdone slots\n</p>");
+    foreach my $error (@errors) {
+	$r->print("<p>$error\n</p>");
+    }
+    &show_table($r,$mgr);
+    return '';
+}
+
 sub handler {
     my $r=shift;
 
-    &start_page($r);
-    my $symb=&Apache::lonnet::unescape($env{'form.symb'});
-    my (undef,undef,$res)=&Apache::lonnet::decode_symb($symb);
-    if ($res !~ /\.task$/) {
-	&fail($r,'not_valid');
+    &Apache::loncommon::content_type($r,'text/html');
+    &Apache::loncommon::no_cache($r);
+    if ($r->header_only()) {
+	$r->send_http_header();
 	return OK;
     }
+
+    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
     
-    if ($env{'form.requestattempt'}) {
-	&show_choices($r,$symb);
+    my $vgr=&Apache::lonnet::allowed('vgr',$env{'request.course.id'});
+    my $mgr=&Apache::lonnet::allowed('mgr',$env{'request.course.id'});
+    my $title='Requesting Another Worktime';
+    if ($env{'form.command'} =~ /^(showslots|uploadstart|csvuploadmap|csvuploadassign)$/ && $vgr eq 'F') {
+	$title = 'Managing Slots';
     }
+    &start_page($r,$title);
 
+    if ($env{'form.command'} eq 'showslots' && $vgr eq 'F') {
+	&show_table($r,$mgr);
+    } elsif ($env{'form.command'} eq 'remove_registration' && $mgr eq 'F') {
+	&remove_registration($r);
+    } elsif ($env{'form.command'} eq 'release' && $mgr eq 'F') {
+	&release_slot($r,undef,undef,undef,$mgr);
+    } elsif ($env{'form.command'} eq 'delete' && $mgr eq 'F') {
+	&delete_slot($r);
+    } elsif ($env{'form.command'} eq 'uploadstart' && $mgr eq 'F') {
+	&upload_start($r);
+    } elsif ($env{'form.command'} eq 'csvuploadmap' && $mgr eq 'F') {
+	&csv_upload_map($r);
+    } elsif ($env{'form.command'} eq 'csvuploadassign' && $mgr eq 'F') {
+	if ($env{'form.associate'} ne 'Reverse Association') {
+	    &csv_upload_assign($r,$mgr);
+	} else {
+	    if ( $env{'form.upfile_associate'} ne 'reverse' ) {
+		$env{'form.upfile_associate'} = 'reverse';
+	    } else {
+		$env{'form.upfile_associate'} = 'forward';
+	    }
+	    &csv_upload_map($r);
+	}
+    } else {
+	my $symb=&Apache::lonnet::unescape($env{'form.symb'});
+	my (undef,undef,$res)=&Apache::lonnet::decode_symb($symb);
+	my $useslots = &Apache::lonnet::EXT("resource.0.useslots",$symb);
+	if ($useslots ne 'resource') {
+	    &fail($r,'not_valid');
+	    return OK;
+	}
+	$env{'request.symb'}=$symb;
+	my $type = ($res =~ /\.task$/) ? 'Task'
+	                               : 'problem';
+	my ($status) = &Apache::lonhomework::check_slot_access('0',$type);
+	if ($status eq 'CAN_ANSWER' ||
+	    $status eq 'NEEDS_CHECKIN' ||
+	    $status eq 'WAITING_FOR_GRADE') {
+	    &fail($r,'not_allowed');
+	    return OK;
+	}
+	if ($env{'form.requestattempt'}) {
+	    &show_choices($r,$symb);
+	} elsif ($env{'form.command'} eq 'release') {
+	    &release_slot($r,$symb);
+	} elsif ($env{'form.command'} eq 'get') {
+	    &get_slot($r,$symb);
+	} elsif ($env{'form.command'} eq 'change') {
+	    if (&release_slot($r,$symb,$env{'form.releaseslot'},1)) {
+		&get_slot($r,$symb);
+	    }
+	} else {
+	    $r->print("<p>Unknown command: ".$env{'form.command'}."</p>");
+	}
+    }
     &end_page($r);
     return OK;
 }
+
+1;
+__END__
