# The LearningOnline Network
# Pick a student from the classlist
#
# $Id: lonpickstudent.pm,v 1.33 2020/02/12 16:25:47 raeburn Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#

package Apache::lonpickstudent;

use strict;
use Apache::Constants qw(:common);
use Apache::loncommon;
use Apache::loncoursedata;
use Apache::lonnet;
use Apache::lonlocal;
use Apache::longroup;
use LONCAPA;

sub handler {
    my $r = shift;
    &Apache::loncommon::content_type($r,'text/html');
    $r->send_http_header;
    return OK if $r->header_only;

# ------------------------------------------------------------ Print the screen
    $r->print(&Apache::loncommon::start_page("Selecting a User",undef,
					     {'no_nav_bar' => 1}));


    &Apache::loncommon::get_unprocessed_cgi
        ($ENV{'QUERY_STRING'},['filter','form','unameelement','udomelement',
			       'roles','courseadv','clicker']);
# Allowed?
    my $allowed;
    if ($env{'request.course.id'}) {
        if (!($allowed = &Apache::lonnet::allowed('srm',$env{'request.course.id'}))) {
            if ($env{'request.course.sec'}) {
                $allowed = &Apache::lonnet::allowed('srm',
                               "$env{'request.course.id'}/$env{'request.course.sec'}");
                if ($allowed) { $allowed = 'section'; }
            }
        }
    }

    unless (($env{'form.roles'}) || ($allowed)) {
	$r->print(&mt('No context.').
		  &Apache::loncommon::end_page());
        return OK;
    }

# See if filter present
    my $filter=$env{'form.filter'};
    my $filtermsg;
    my $encoded_filter = &HTML::Entities::encode($filter,'<>&"');
    $filter = quotemeta($filter);
    my $change = &mt('Change');
    my $filterbutton =<<FILTER;
  <input type="text" name="filter" value="$encoded_filter" />
  <input type="submit" name="Change" value="$change" />
FILTER
    foreach my $name ('form','unameelement','udomelement','roles','courseadv','clicker') {
	my $value = &HTML::Entities::encode($env{"form.$name"},'<>&"');
	$filterbutton .= <<HIDDEN;
   <input type="hidden" name="$name" value="$value" />
HIDDEN
    }
    unless ($env{'form.courseadv'} eq 'only') {
        if ($env{'request.course.id'}) {
            my $crstype = &Apache::loncommon::course_type();
            my $showrole = &Apache::lonnet::plaintext('st',$crstype);
            $filtermsg = &mt("Showing users with role of '[_1]' with name starting: [_2]",
                             $showrole,$filterbutton);
        } else {
            $filtermsg =
	        &mt('Showing users with a name starting with [_1]',
	            $filterbutton);
        }
    }
    if ($filter eq '') {
	$filter = '.'
    }

# --------------------------------------- There is such a user, get environment

    $r->print(<<ENDSCRIPT);
<script type="text/javascript">
function gochoose(uname,udom) {
    opener.document.$env{'form.form'}.elements['$env{'form.unameelement'}'].value=uname;
    var slct=opener.document.$env{'form.form'}.elements['$env{'form.udomelement'}'];
    var i;
    for (i=0;i<slct.length;i++) {
        if (slct.options[i].value==udom) { slct.selectedIndex=i; }
    }
    self.close();
}
</script>
ENDSCRIPT

    $r->print('<form action="">');
    if ($allowed && (!$env{'form.roles'})) {
        unless ($env{'form.courseadv'} eq 'none') {
# -------------------------------------------------------- Get course personnel
	    $r->print('<h3>'.$env{'course.'.$env{'request.course.id'}.'.description'}.
		      '</h3>');
	    my %coursepersonnel=
	        &Apache::lonnet::get_course_adv_roles();
	    $r->print(&Apache::loncommon::start_data_table());
	    foreach my $role (sort(keys(%coursepersonnel))) {
	        foreach my $user (split(/\,/,$coursepersonnel{$role})) {
		    my ($puname,$pudom)=split(/\:/,$user);
		    $r->print(&Apache::loncommon::start_data_table_row().
			      '<td>'.
			      '<input type="button" value="'.&mt('Select').'" onclick="gochoose('.
			      "'".$puname."','".$pudom."')".'" /></td><td>'.$role.'</td><td>'.
			      &Apache::loncommon::aboutmewrapper(&Apache::loncommon::plainname($puname,$pudom),$puname,$pudom).'</td>'.
			      &Apache::loncommon::end_data_table_row());
                }
            }
            $r->print(&Apache::loncommon::end_data_table().'<br /><hr />');
        }

        if ($filtermsg ne '') {
            $r->print('<p>'.$filtermsg.'</p>');
        }

        $r->rflush();

        unless ($env{'form.courseadv'} eq 'only') {

# ------------------------------------------------------------------ Students

# Do we have a clicker?

            my $clicker=$env{'form.clicker'};
            my @fragments=();
            if ($clicker) {
               $r->print('<h1>'.&mt('Clicker: [_1]',$clicker).'</h1>');
               my $clicklength=length($clicker);
               my $maxlength=$clicklength-1;
               if ($maxlength>2) {
                  my $minlength=$maxlength-2;
                  if ($minlength<2) { $minlength=2; }
                  for (my $length=$maxlength;$length>=$minlength;$length--) {
                      for (my $startidx=0; $startidx<=$clicklength-$length; $startidx++) {
                          push(@fragments,substr($clicker,$startidx,$length));
                      }
                  }
               }
            }

	    my $result;
            my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
            my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
            my $classlist=&Apache::loncoursedata::get_classlist();
            my %grouplist=&Apache::lonnet::get_group_membership($cdom,$cnum);
            my $now = time;
            my %allgroups = &Apache::longroup::coursegroups($cdom,$cnum);

	    foreach my $user (sort(keys(%$classlist))) {
	        # the following undefs are for 'domain', and 'username' respectively.
	        my (undef,undef,$end,$start,$id,$section,$fullname,$status)=
		    @{$classlist->{$user}};
	        if ($allowed eq 'section' && $section ne $env{'request.course.sec'}) {
		    next;
	        }
	        if ($user=~/^($LONCAPA::username_re)\:($LONCAPA::domain_re)$/) {
		    my ($uname,$udom)=($1,$2);
		    if (($uname=~/^$filter/) || ($fullname=~/^$filter/i)) {
		        my $grouplist = '';
		        foreach my $group (sort(keys(%allgroups))) {
			    if (exists($grouplist{$group.':'.$uname.':'.$udom})) {
			        my ($end,$start) = split(/:/,$grouplist{$group.':'.$uname.':'.$udom});
			        if (($end!=0) && ($end<$now)) { next; }
			        if (($start!=0) && ($start>$now)) {next; }
			        $grouplist .= " $group,"; 
			    }
		        }
		        $grouplist =~ s/,$//;
                        my $markedupclicker;
                        if ($clicker) {
                           $markedupclicker=(&Apache::lonnet::userenvironment($udom,$uname,'clickers'))[1];
                           if ($markedupclicker!~/\w/) { 
                              $markedupclicker='-'; 
                           } else {
                               foreach my $frag (@fragments) {
                                  if ($markedupclicker=~/\Q$frag\E/is) {
                                     $markedupclicker=~s/(\Q$frag\E)/<font color=\"green\" size=\"\+1\"><b>$1<\/b><\/font>/gis;
                                     last;
                                  }
                               }
                           }
                        }
		        $result .=&Apache::loncommon::start_data_table_row().
		    	          '<td>'.
			          '<input type="button" value="'.&mt('Select').'" onclick="gochoose('.
			          "'".$uname."','".$udom."')".'" /></td>'.
			          '<td><tt>'.$uname.'</tt></td><td> <tt>'.$udom.
			          '</tt></td><td>'.
			          &Apache::loncommon::aboutmewrapper($fullname,
				    				     $uname,$udom).
			          '</td><td>'.$id.'</td><td>'.$section.
			          '</td><td>'.$grouplist.'</td>'.
                                  ($clicker?'<td>'.$markedupclicker.'</td>':'').
			          &Apache::loncommon::end_data_table_row();
		    }
	        }
	    }
	    if (!$result) {
	        $r->print('<p>'.&mt('No students found.').'</p>');
	    } else {
	        $r->print(&Apache::loncommon::start_data_table().
	    	          &Apache::loncommon::start_data_table_header_row().
		          &Apache::loncommon::end_data_table_header_row().
		          '<th>&nbsp;</th>'.
		          '<th>'.&mt('username').'</th>'.
		          '<th>'.&mt('domain').'</th>'.
		          '<th>'.&mt('Name').'</th>'.
		          '<th>'.&mt('ID').'</th>'.
		          '<th>'.&mt('section').'</th>'.
		          '<th>'.&mt('active group(s)').'</th>'.
                          ($clicker?'<th>'.&mt('clicker').'</th>':'').
		          &Apache::loncommon::end_data_table_header_row().
		          $result.
		          &Apache::loncommon::end_data_table());
	    }
        }
    } else {
	$r->print('<h3>'.&mt('Users with Roles Assigned by').' '.
		  &Apache::loncommon::plainname($env{'user.name'},
						$env{'user.domain'}).'</h3>');
	$r->print($filtermsg);
        $r->rflush();

	$r->print('<p>'.&Apache::loncommon::start_data_table());
	my %user_role=&Apache::lonnet::get_my_roles();
	my %users;
	foreach my $user_role (keys(%user_role)) {
	    next if ($user_role !~
		     /^($LONCAPA::username_re):($LONCAPA::domain_re):(\w+)$/);
	    my ($uname,$udom,$urole)=($1,$2,$3);
	    my $fullname=&Apache::loncommon::plainname($uname,$udom);
	    next if (($uname!~/^$filter/i) && ($fullname !~/^$filter/i));
	    
	    if (!exists($users{"$uname:$udom"})) {
		$users{"$uname:$udom"} = {'fullname' => $fullname };
	    }
	    push(@{$users{"$uname:$udom"}{'roles'}},$urole);
	}
	foreach my $user (sort {lc($a) cmp lc($b)} (keys(%users))) {
	    my ($uname,$udom) = split(':',$user);
	    $r->print(&Apache::loncommon::start_data_table_row().
		      '<td>'.
		      '<input type="button" value="'.&mt('Select').'" onclick="gochoose('.
		      "'".$uname."','".$udom."')".'" /></td>'.
		      '<td><tt>'.$uname.'</tt></td>'.
		      '<td><tt>'.$udom.'</tt></td><td>'.
		      &Apache::loncommon::aboutmewrapper($users{$user}{'fullname'},
							 $uname,$udom).'</td>'.
		      '<td>'.
		      join(', ',sort(map {&Apache::lonnet::plaintext($_)}
				         (@{$users{$user}{'roles'}}))).
		      '</td>'.
		      &Apache::loncommon::end_data_table_row());
	}
	$r->print(&Apache::loncommon::end_data_table().'</p>');
    }
    $r->print('</form>'.&Apache::loncommon::end_page());
    return OK;
}

1;
__END__