# The LearningOnline Network with CAPA
# Routines to control the menu
#
# $Id: lonmenu.pm,v 1.37 2003/02/14 15:14:37 www 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/
#
# (TeX Conversion Module
#
# 05/29/00,05/30 Gerd Kortemeyer)
#
# 10/05,05/28,05/30,06/01,06/08,06/09,07/04,08/07 Gerd Kortemeyer
# 02/15/02 Matthew Hall

package Apache::lonmenu;

use strict;
use Apache::lonnet;
use Apache::Constants qw(:common);
use Apache::loncommon;
use Apache::File;
use vars qw(@desklines $readdesk);

# ============================================================= Start up remote

sub startupremote {
    my ($lowerurl)=@_;
    if ($ENV{'browser.interface'} eq 'textual') {
     return ('<meta HTTP-EQUIV="Refresh" CONTENT="0.5; url='.$lowerurl.'" />');
    }
    my $configmenu=&rawconfig();
    return(<<ENDREMOTESTARTUP);
<script>

function wheelswitch() {
   if (window.status=='|') { 
      window.status='/'; 
   } else {
      if (window.status=='/') {
         window.status='-';
      } else {
         if (window.status=='-') { 
            window.status='\\\\'; 
         } else {
            if (window.status=='\\\\') { window.status='|'; }
         }
      }
   } 
}

// ---------------------------------------------------------- The wait function
var canceltim;
function wait() {
   if ((menuloaded==1) || (tim==1)) {
      window.status='Done.';
      if (tim==0) {
         clearTimeout(canceltim);
         $configmenu
         window.location='$lowerurl';  
      } else {
         alert("Remote Control timed out. It is possible that it was blocked by pop-up window filters.");
      }
   } else {
      wheelswitch();
      setTimeout('wait();',200);
   }
}

function main() {
   canceltim=setTimeout('tim=1;',60000);
   window.status='-';
   wait();
}

</script>
ENDREMOTESTARTUP
}

sub setflags() {
    return(<<ENDSETFLAGS);
<script>
    menuloaded=0;
    tim=0;
</script>
ENDSETFLAGS
}

sub maincall() {
    if ($ENV{'browser.interface'} eq 'textual') { return ''; }
    return(<<ENDMAINCALL);
<script>
    main();
</script>
ENDMAINCALL
}
# ================================================================= Reopen menu

sub reopenmenu {
   my $nothing='';
   if ($ENV{'browser.interface'} eq 'textual') { return ''; }
   my $menuname='LCmenu'.$Apache::lonnet::perlvar{'lonHostID'};
   if ($ENV{'browser.type'} eq 'explorer') { $nothing='javascript:void(0);'; }
   return('window.open("'.$nothing.'","'.$menuname.'","",false);');
} 

# =============================================================== Open the menu

sub open {
    my $returnval='';
    if ($ENV{'browser.interface'} eq 'textual') { return ''; }
    my $menuname='LCmenu'.$Apache::lonnet::perlvar{'lonHostID'};
    unless (shift eq 'unix') {
# resizing does not work on linux because of virtual desktop sizes
       $returnval.=(<<ENDRESIZE);
if (window.screen) {
    self.resizeTo(screen.availWidth-215,screen.availHeight-55);
    self.moveTo(190,15);
}
ENDRESIZE
    }
    $returnval.=(<<ENDOPEN);
window.status='Opening LON-CAPA Remote Control';
var menu=window.open("/res/adm/pages/menu.html","$menuname",
"height=350,width=150,scrollbars=no,menubar=no,top=5,left=5,screenX=5,screenY=5");
ENDOPEN
    return '<script>'.$returnval.'</script>';
}


# ================================================================== Raw Config

sub clear {
    my ($row,$col)=@_;
    unless ($ENV{'browser.interface'} eq 'textual') {
       return "\n".qq(window.status+='.';swmenu.clearbut($row,$col););
   } else { return ''; }
}

# Switch acts on the javascript that is executed when a button is clicked.  
# The javascript is usually similar to "go('/adm/roles')" or "cstrgo(..)".
sub switch {
    my ($uname,$udom,$row,$col,$img,$top,$bot,$act,$desc)=@_;
    $act=~s/\$uname/$uname/g;
    $act=~s/\$udom/$udom/g;
    unless ($ENV{'browser.interface'} eq 'textual') {
       return "\n".
 qq(window.status+='.';swmenu.switchbutton($row,$col,"$img","$top","$bot","$act","$desc"););
   } else {
       my $text=$top.' '.$bot;
       $text=~s/\- //;
       return '<br /><a href="javascript:'.$act.';">'.$text.'</a> '.$desc;
   }
}

sub secondlevel {
    my $output='';
    my 
    ($uname,$udom,$rol,$crs,$pub,$con,$row,$col,$prt,$img,$top,$bot,$act,$desc)=@_;
    if ($prt eq 'any') {
	   $output.=switch($uname,$udom,$row,$col,$img,$top,$bot,$act,$desc);
    } elsif ($prt=~/^r(\w+)/) {
        if ($rol eq $1) {
           $output.=switch($uname,$udom,$row,$col,$img,$top,$bot,$act,$desc);
        }
    }
    return $output;
}

sub openmenu {
    my $menuname='LCmenu'.$Apache::lonnet::perlvar{'lonHostID'};
    if ($ENV{'browser.interface'} eq 'textual') { return ''; }
    if ($ENV{'browser.type'} eq 'explorer') {
       return "window.open('javascript:void(0);','".$menuname."');";
   } else {
       return "window.open('','".$menuname."');";
   }
}

sub rawconfig {
    my $textualoverride=shift;
    my $output='';
    unless ($ENV{'browser.interface'} eq 'textual') {
       $output.=
 "window.status='Opening Remote Control';var swmenu=".&openmenu().
"\nwindow.status='Configuring Remote Control ';";
    } else {
       unless ($textualoverride) { return ''; }
    }
    my $uname=$ENV{'user.name'};
    my $udom=$ENV{'user.domain'};
    my $adv=$ENV{'user.adv'};
    my $author=$ENV{'user.author'};
    my $crs='';
    if ($ENV{'request.course.id'}) {
       $crs='/'.$ENV{'request.course.id'};
       if ($ENV{'request.course.sec'}) {
	   $crs.='_'.$ENV{'request.course.sec'};
       }
       $crs=~s/\_/\//g;
    }
    my $pub=($ENV{'request.state'} eq 'published');
    my $con=($ENV{'request.state'} eq 'construct');
    my $rol=$ENV{'request.role'};
    my $requested_domain = $ENV{'request.role.domain'};
    foreach (@desklines) {
        my ($row,$col,$pro,$prt,$img,$top,$bot,$act,$desc)=split(/\:/,$_);
        $prt=~s/\$uname/$uname/g;
        $prt=~s/\$udom/$udom/g;
        $prt=~s/\$crs/$crs/g; 
        $prt=~s/\$requested_domain/$requested_domain/g;
        if ($pro eq 'clear') {
	    $output.=&clear($row,$col);
        } elsif ($pro eq 'any') {
               $output.=&secondlevel(
	  $uname,$udom,$rol,$crs,$pub,$con,$row,$col,$prt,$img,$top,$bot,$act,$desc);
	} elsif ($pro eq 'smp') {
            unless ($adv) {
               $output.=&secondlevel(
          $uname,$udom,$rol,$crs,$pub,$con,$row,$col,$prt,$img,$top,$bot,$act,$desc);
            }
        } elsif ($pro eq 'adv') {
            if ($adv) {
               $output.=&secondlevel(
	  $uname,$udom,$rol,$crs,$pub,$con,$row,$col,$prt,$img,$top,$bot,$act,$desc);
            }
        } elsif (($pro=~/p(\w+)/) && ($prt)) {
	    if (&Apache::lonnet::allowed($1,$prt)) {
               $output.=switch($uname,$udom,$row,$col,$img,$top,$bot,$act,$desc);
            }
        } elsif ($pro eq 'course') {
            if ($ENV{'request.course.fn'}) {
               $output.=switch($uname,$udom,$row,$col,$img,$top,$bot,$act,$desc);
	    }
        } elsif ($pro eq 'author') {
            if ($author) {
                if ((($prt eq 'rca') && ($ENV{'request.role'}=~/^ca/)) ||
                    (($prt eq 'rau') && ($ENV{'request.role'}=~/^au/))) {
                    # Check that we are on the correct machine
                    my $cadom=$requested_domain;
                    my $caname=$ENV{'user.name'};
                    if ($prt eq 'rca') {
		       ($cadom,$caname)=
                               ($ENV{'request.role'}=~/(\w+)\/(\w+)$/);
                    }                       
                    $act =~ s/\$caname/$caname/g;
                    my $home = &Apache::lonnet::homeserver($caname,$cadom);
                    if ($home eq $Apache::lonnet::perlvar{'lonHostID'}) {
                        $output.=switch($caname,$cadom,
                                        $row,$col,$img,$top,$bot,$act,$desc);
                    }
                }
            }
        }
    }
    unless ($ENV{'browser.interface'} eq 'textual') {
       $output.="\nwindow.status='Synchronizing Time';swmenu.syncclock(1000*".time.");\nwindow.status='Remote Control Configured.';";
    }
    return $output;
}

# ======================================================================= Close

sub close {
    if ($ENV{'browser.interface'} eq 'textual') { return ''; }
    my $menuname='LCmenu'.$Apache::lonnet::perlvar{'lonHostID'};
    return(<<ENDCLOSE);
<script>
window.status='Accessing Remote Control';
menu=window.open("/adm/rat/empty.html","$menuname",
                 "height=350,width=150,scrollbars=no,menubar=no");
window.status='Disabling Remote Control';
menu.active=0;
menu.autologout=0;
window.status='Closing Remote Control';
menu.close();
window.status='Done.';
</script>
ENDCLOSE
}

# ====================================================================== Footer

sub footer {

}

# ================================================ Handler when called directly


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

    my $bodytag=&Apache::loncommon::bodytag('Main Menu');
# ------------------------------------------------------------ Print the screen
    $r->print(<<ENDHEADER);
<html><head>
<title>LON-CAPA Main Menu</title>
<script>
function go(url) {
    window.location=url;
}
function gopost(url) {
    window.location=url;
}
</script>
</head>
$bodytag
ENDHEADER
    $r->print(&rawconfig(1));
    $r->print('</body></html>');
    return OK;
}

# ================================================================ Main Program

BEGIN {
  if (! defined($readdesk)) {
   {
    my $config=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.
				  '/mydesk.tab');
    while (my $configline=<$config>) {
       $configline=(split(/\#/,$configline))[0];
       $configline=~s/^\s+//;
       chomp($configline);
       if ($configline) {
          $desklines[$#desklines+1]=$configline;
       }
    }
   }
   $readdesk='done';
  }
}

1;
__END__