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- cstore/restore/rndseed check the environmetn to see if we are rendering
  for a different user or not (allowed calls need to be converted too)

- <dataresponse> displays some information about itself for target web

# The LON-CAPA Homework handler
# Guy Albertelli
# 11/30 Gerd Kortemeyer
# 6/1,8/17,8/18 Gerd Kortemeyer

package Apache::lonhomework;
use strict;
use Apache::style;
use Apache::lonxml;
use Apache::lonnet;
use Apache::inputtags;
use Apache::structuretags;
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 $ENV{'form.submitted'}) {
      return ('grade', 'web');
    } else {
      return ('web');
    }
  } elsif ($ENV{'request.state'} eq "construct") {
    if ( defined $ENV{'form.preview'}) {
      if ( defined $ENV{'form.submitted'}) {
	return ('grade', 'web');
      } else {
	return ('web');
      }
    } else {
      if ( $ENV{'form.problemmode'} eq 'View' ) {
	if ( defined $ENV{'form.submitted'}) {
	  return ('grade', 'web');
	} else {
	  return ('web');
	}
      } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
	if ( $ENV{'form.submitted'} eq 'edit' ) {
	  return ('modified','edit');
	} else {
	  return ('edit');
	}
      } else {
	return ('web');
      }
    }
  }
  return ();
}

sub setup_vars {
  my ($target) = @_;
  return ';'
#  return ';$external::target='.$target.';';
}

sub send_header {
  my ($request)= @_;
  $request->print(&Apache::lontexconvert::header());
#  $request->print('<form name='.$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());
}

$Apache::lonxml::browse='';

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);
}

# ----------------------------------------------------------------- whichuser
# returns a list of $symb, $courseid, $domain, $name that is correct for
# calls to lonnet functions for this setup.
# - looks for form.grade_ parameters
sub whichuser {
  my $symb=&Apache::lonnet::symbread();
  my $courseid=$ENV{'request.course.id'};
  my $domain=$ENV{'user.domain'};
  my $name=$ENV{'user.name'};
  if (defined($ENV{'form.grade_symb'})) {
    my $tmp_courseid=$ENV{'form.grade_courseid'};
    my $allowed=&Apache::lonnet::allowed('mgr',$tmp_courseid);
    if ($allowed) {
      $symb=$ENV{'form.grade_symb'};
      $courseid=$ENV{'form.grade_courseid'};
      $domain=$ENV{'form.grade_domain'};
      $name=$ENV{'form.grade_username'};
    }
  }
  return ($symb,$courseid,$domain,$name);
}

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');
  }
  $request->send_http_header;
  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 $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 $result = '';
    &Apache::inputtags::initialize_inputtags;
    &Apache::edit::initialize_edit;
    if ($target eq 'web') {
      if (&Apache::lonnet::symbread() eq '') {
	if ($ENV{'request.state'} eq "construct") {
	  $request->print("In construction space, submissions ignored<br />");
	} else {
	  $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");
	}
      }
      #if ($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='';
    }
    $result = &Apache::lonxml::xmlparse($target, $problem,
			$default.&setup_vars($target),%mystyle);

    #$request->print("Result follows:");
    if ($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");
    #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>";
    }
  }
  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;
    }
  }

  if ($ENV{'request.state'} eq "construct") {
    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;

}

1;
__END__