--- loncom/interface/slotrequest.pm	2005/05/31 17:42:11	1.1
+++ loncom/interface/slotrequest.pm	2005/08/09 15:38:13	1.7
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler for requesting to have slots added to a students record
 #
-# $Id: slotrequest.pm,v 1.1 2005/05/31 17:42:11 albertel Exp $
+# $Id: slotrequest.pm,v 1.7 2005/08/09 15:38:13 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -37,7 +37,12 @@ use Apache::lonnet;
 
 sub fail {
     my ($r,$code)=@_;
-    $r->print();
+    if ($code eq 'not_valid') {
+	$r->print('<p>'.&mt('Unable to understand what resource you wanted to sign up for.').'</p>'.$env{'form.symb'});
+
+    }
+    $r->print('<p><a href="/adm/flip?postdata=return:">'.
+	      &mt('Return to last resource').'</a></p>');
     &end_page($r);
 }
 
@@ -54,17 +59,456 @@ sub end_page {
     $r->print(&Apache::loncommon::endbodytag().'</html>');
 }
 
+=pod
+
+ slot_reservations db
+   - keys are 
+    - slotname\0id -> value is an hashref of
+                         name -> user@domain of holder
+                         timestamp -> timestamp of reservation
+                         symb -> symb of resource that it is reserved for
+
+=cut
+
+sub get_course {
+    (undef,my $courseid)=&Apache::lonxml::whichuser();
+    my $cdom=$env{'course.'.$courseid.'.domain'};
+    my $cnum=$env{'course.'.$courseid.'.num'};
+    return ($cnum,$cdom);
+}
+
+sub get_reservation_ids {
+    my ($slot_name)=@_;
+    
+    my ($cnum,$cdom)=&get_course();
+
+    my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
+				       "^$slot_name\0");
+    
+    my ($tmp)=%consumed;
+    if ($tmp=~/^error: 2 / ) {
+	return 0;
+    }
+    return keys(%consumed);
+}
+
+sub space_available {
+    my ($slot_name,$slot)=@_;
+    my $max=$slot->{'maxspace'};
+
+    if (!defined($max)) { return 1; }
+
+    my $consumed=scalar(&get_reservation_ids($slot_name));
+    if ($consumed < $max) {
+	return 1
+    }
+    return 0;
+}
+
+sub check_for_reservation {
+    my ($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);
+
+    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);
+    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 $slot_name;
+	}
+    }
+    return undef;
+
+}
+
+sub make_reservation {
+    my ($slot_name,$slot,$symb)=@_;
+
+    my ($cnum,$cdom)=&get_course();
+
+    my $value=&Apache::lonnet::EXT("resource.0.availablestudent",$symb,
+				   $env{'user.domain'},$env{'user.name'});
+    &Apache::lonxml::debug("value is  $value<br />");
+    foreach my $other_slot (split(/:/, $value)) {
+	if ($other_slot eq $slot_name) {
+	    my %consumed=&Apache::lonnet::dump('slot_reservations', $cdom,
+					       $cnum, "^$slot_name\0");   
+
+	    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)) { $max=99999; }
+
+    my (@ids)=&get_reservation_ids($slot_name);
+
+    my $last=0;
+    foreach my $id (@ids) {
+	my $num=(split('\0',$id))[1];
+	if ($num > $last) { $last=$num; }
+    }
+    
+    my $wanted=$last+1;
+    &Apache::lonxml::debug("wanted $wanted<br />");
+    if (scalar(@ids) >= $max) {
+	# full up
+	return undef;
+    }
+    
+    my %reservation=('name'      => $env{'user.name'}.'@'.$env{'user.domain'},
+		     'timestamp' => time,
+		     'symb'      => $symb);
+
+    my $success=&Apache::lonnet::newput('slot_reservations',
+					{"$slot_name\0$wanted" =>
+					     \%reservation},
+					$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 $wanted;
+    }
+
+    # someone else got it
+    return undef;
+}
+
+sub release_slot {
+    my ($r,$symb,$slot_name,$inhibit_return_link)=@_;
+
+    if ($slot_name eq '') { $slot_name=$env{'form.slotname'}; }
+    my ($cnum,$cdom)=&get_course();
+
+    # get parameter string, check for existance, rebuild string with the slot
+				       
+    my @slots = split(/:/,&Apache::lonnet::EXT("resource.0.availablestudent",
+					       $symb,$env{'user.domain'},
+					       $env{'user.name'}));
+    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 
+	     ($env{'user.name'}.'@'.$env{'user.domain'}) ) {
+	    &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',
+						      $env{'user.name'},
+						      $env{'user.domain'});
+    my %slot=&Apache::lonnet::get_slot($slot_name);
+    my $description=&get_description($env{'form.slotname'},\%slot);
+    $r->print("<p>Released Reservation: $description</p>");
+    if (!$inhibit_return_link) {
+	$r->print('<p><a href="/adm/flip?postdata=return:">'.
+		  &mt('Return to last resource').'</a></p>');
+    }
+    return 1;
+}
+
+sub get_slot {
+    my ($r,$symb)=@_;
+
+    my $slot_name=&check_for_conflict($symb,$env{'form.slotname'});
+    if ($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 <a href="/adm/flip?postdata=return:">'.
+		      &mt('Return to last resource').'</a></p>');
+	    $r->print(<<STUFF);
+</form>
+STUFF
+        } else {
+	    $r->print('<p><a href="/adm/flip?postdata=return:">'.
+		      &mt('Return to last resource').'</a></p>');
+	}
+	return;
+    }
+    my %slot=&Apache::lonnet::get_slot($env{'form.slotname'});
+    my $reserved=&make_reservation($env{'form.slotname'},
+				   \%slot,$symb);
+    my $description=&get_description($env{'form.slotname'},\%slot);
+    if (defined($reserved)) {
+	if ($reserved > -1) {
+	    $r->print("<p>Success: $description</p>");
+	    $r->print('<p><a href="/adm/flip?postdata=return:">'.
+		      &mt('Return to last resource').'</a></p>');
+	    return;
+	} elsif ($reserved < 0) {
+	    $r->print("<p>Already reserved: $description</p>");
+	    $r->print('<p><a href="/adm/flip?postdata=return:">'.
+		      &mt('Return to last resource').'</a></p>');
+	    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
+    $r->print('<p><a href="/adm/flip?postdata=return:">'.
+	      &mt('Return to last resource').'</a></p>');
+    return;
+}
+
+sub allowed_slot {
+    my ($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)))  {
+
+	&Apache::lonxml::debug("Checking Slot $slot");
+	next if (!&allowed_slot($slot,$slots{$slot}));
+
+	$available++;
+
+	my $description=&get_description($slot,$slots{$slot});
+
+	my $form=&mt('Unavailable');
+	if (($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);
+	    $form=<<STUFF;
+   <form method="POST" action="/adm/slotrequest">
+     <input type="submit" name="Select" value="$text" />
+     <input type="hidden" name="symb" value="$escsymb" />
+     <input type="hidden" name="slotname" value="$slot" />
+     <input type="hidden" name="command" value="$command" />
+   </form>
+STUFF
+	}
+	$r->print(<<STUFF);
+<tr>
+ <td>$form</td>
+ <td>$description</td>
+</tr>
+STUFF
+    }
+
+    if (!$available) {
+	$r->print('<tr><td>No available times. <a href="/adm/flip?postdata=return:">'.
+		  &mt('Return to last resource').'</a></td></tr>');
+    }
+    $r->print('</table>');
+}
+
+sub show_table {
+    my ($r,$symb)=@_;
+
+    my ($cnum,$cdom)=&get_course();
+    my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
+    my $available;
+    $r->print('<table border="1">');
+    foreach my $slot (sort 
+		      { return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'} }
+		      (keys(%slots)))  {
+	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;
+	foreach my $entry (sort(keys(%consumed))) {
+	    my (undef,$id)=split("\0",$entry);
+	    $ids.= $id.'-> '.$consumed{$entry}->{'name'}.'<br />';
+	}
+	my $start=localtime($slots{$slot}->{'starttime'});
+	my $end=localtime($slots{$slot}->{'endtime'});
+	$r->print(<<STUFF);
+<tr>
+ <td>$slot</td>
+ <td>$description</td>
+ <td>$start</td>
+ <td>$end</td>
+ <td>$slots{$slot}->{'maxspace'}</td>
+ <td>$ids</td>
+</tr>
+STUFF
+    }
+    $r->print('</table>');
+}
+
 sub handler {
     my $r=shift;
 
     &start_page($r);
-    my $symb=$env{'form.symb'};
+    my $symb=&Apache::lonnet::unescape($env{'form.symb'});
     my (undef,undef,$res)=&Apache::lonnet::decode_symb($symb);
-    if ($symb !~ /\.task$/) {
+    if ($res !~ /\.task$/) {
 	&fail($r,'not_valid');
 	return OK;
     }
-
+ 
+    if ($env{'form.command'} eq 'showslots') {
+	&show_table($r,$symb);
+    } elsif ($env{'form.requestattempt'}) {
+	&show_choices($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') {
+       	&release_slot($r,$symb,$env{'form.releaseslot'},1);
+	&get_slot($r,$symb);
+    }
     &end_page($r);
     return OK;
 }
+
+1;
+__END__