# The LearningOnline Network with CAPA
# random labelling tool
# 7/20/2001 Isaac Tsai, initial syntax
# 8/10/2001 Isaac Tsai, 
# 8/30/2001 Isaac Tsai, 
# SYNTAX:
# <randomlabel bgimg="URL" width="12" height="45" texwidth="50">
#    <labelgroup name="GroupOne" type="image">
#      <location x="123" y="456" />
#      <location x="321" y="654" />
#      <location x="213" y="546" />
#      <label description="TEXT-1">IMG-URL</label>
#      <label description="TEXT-2">IMG-URL</label>
#      <label description="TEXT-3">IMG-URL</label>
#    </labelgroup>
#    <labelgroup name="GroupTwo" type="text">
#      <location x="12" y="45" />
#      <location x="32" y="65" />
#      <location x="21" y="54" />
#      <label>TEXT-1</label>
#      <label>TEXT-2</label>
#      <label>TEXT-3</label>
#    </labelgroup>
#   </randomlabel>
#  ===========================================
#  side effect:
#    location (123,456): $GroupOne[0] = 2  # images give out indexes
#             (321,654): $GroupOne[1] = 1
#             (213,546): $GroupOne[2] = 0
#    location (12,45)  : $GroupTwo[0] = "TEXT-3"
#             (32,65)  : $GroupTwo[1] = "TEXT-1"
#             (21,54)  : $GroupTwo[2] = "TEXT-2"
#  ===========================================
package Apache::randomlabel;
use strict;

sub BEGIN {
  &Apache::lonxml::register('Apache::randomlabel',('randomlabel','labelgroup','location','label'));
}

sub start_randomlabel {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $result='';
  my $bgimg= &Apache::lonxml::get_param('bgimg',$parstack,$safeeval);
  my $code = &Apache::lonxml::get_param('code',$parstack,$safeeval);
  my $codebase = &Apache::lonxml::get_param('codebase',$parstack,$safeeval);
  my $w= &Apache::lonxml::get_param('width',$parstack,$safeeval);
  my $h= &Apache::lonxml::get_param('height',$parstack,$safeeval);
  my $texwidth= &Apache::lonxml::get_param('texwidth',$parstack,$safeeval);
  if (!$code) { $code='GLabel.class'; }
  if (!$codebase) { $codebase='/res/adm/includes/'; }
  $Apache::randomlabel::tlabel_cnt=0;
  $Apache::randomlabel::ilabel_cnt=0;
  if ($target eq 'web') {
    $result.="<applet code=\"$code\" codebase=\"$codebase\" width=\"$w\" height=\"$h\">";
    $result.="<param name=\"bgimg\" value=\"$bgimg\">";
  } elsif ($target eq 'tex') {
    $bgimg=~s/(.gif|.jpg)$/.ps/;
    $result.='\vspace*{2mm} \\ \noindent \epsfxsize='.$texwidth.' \epsffile{'.
      $bgimg.'}\setlength{\unitlength}{1mm} \\ \begin{picture}(0,0)(0,-5)';
  } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_start($target,$token);
    $result.=&Apache::edit::text_arg('Image:','bgimg',$token,75).'<br />'.
      &Apache::edit::text_arg('Width(pixel):','width',$token,4).
	&Apache::edit::text_arg('Height(pixel):','height',$token,4).
	  &Apache::edit::text_arg('TeXWidth(mm):','texwidth',$token,4).
	    '</td></tr><tr><td colspan="3">';
  } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
						 'bgimg','width','height',
						 'texwidth');
    if ($constructtag) {
      $result = &Apache::edit::rebuild_tag($token);
      $result.=&Apache::edit::handle_insert();
    }
  }
  return $result;
}

sub end_randomlabel {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $result='';
  my $count;


  if ($target eq 'web') {
    $count = $Apache::randomlabel::tlabel_cnt;
    if( $count != 0) { $result.= "<param name=\"count\" value=\"$count\">"; }
    $count = $Apache::randomlabel::ilabel_cnt;
    if( $count != 0) { $result.= "<param name=\"icount\" value=\"$count\">"; }
    $result .= "</applet><BR />";
  } elsif ($target eq 'tex') {
    $result='\end{picture}';
  } elsif ($target eq 'edit') {
    $result.=&Apache::edit::end_table;
  }
  return $result;
}

sub start_labelgroup {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $result='';
  my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
  my $type = &Apache::lonxml::get_param('type',$parstack,$safeeval);
  $type =~tr/A-Z/a-z/;
  if ($target eq 'web' || $target eq 'tex') {
    $Apache::randomlabel::groupname=$name;
    $Apache::randomlabel::type=$type;
    @Apache::randomlabel::xcoord = ();
    @Apache::randomlabel::ycoord = ();
    @Apache::randomlabel::label_arr  = ();
  } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_start($target,$token);
    $result.=&Apache::edit::text_arg('Name:','name',$token).
      &Apache::edit::select_arg('Type:','type',['text','image'],$token).
	'</td></tr><tr><td colspan="3">';
  } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
						 'name','type');
    if ($constructtag) {
      $result = &Apache::edit::rebuild_tag($token);
      $result.=&Apache::edit::handle_insert();
    }
  }
  return $result;
}

sub add_var {
  my ($name,$value,$type,$safeeval) = @_;
  if ($type eq 'array') {
    my $code = 'push(@'.$name.',\''.$value.'\');';
    my $out=Apache::run::run($code,$safeeval);
  } else {
    &Apache::lonxml::error('Unsupported add_var type :'.$type.':');
  }
}
# begin to assign labels to locations
sub end_labelgroup {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $gname = $Apache::randomlabel::groupname;
  my $type  = $Apache::randomlabel::type;
  my $result='';
  if ($target eq 'web') {
    my @idx_arr = (0 .. $#Apache::randomlabel::label_arr);
    &Apache::structuretags::shuffle(\@idx_arr);
    for(0 .. $#Apache::randomlabel::label_arr) {
      my $str;
      my $xstr;
      my $ystr;
      my $label = "$Apache::randomlabel::label_arr[ $idx_arr[$_] ]";
      if( $type eq 'text') {
	&add_var($gname,$label,'array',$safeeval);
	$str = 'LB'.$Apache::randomlabel::tlabel_cnt;
	$xstr = 'X'.$Apache::randomlabel::tlabel_cnt;
	$ystr = 'Y'.$Apache::randomlabel::tlabel_cnt;
	$Apache::randomlabel::tlabel_cnt += 1;
      } elsif ( $type eq 'image') {
	&add_var($gname,$idx_arr[$_],'array',$safeeval);
	$str = 'LB'.$Apache::randomlabel::ilabel_cnt;
	$xstr = 'X'.$Apache::randomlabel::ilabel_cnt;
	$ystr = 'Y'.$Apache::randomlabel::ilabel_cnt;
	$Apache::randomlabel::ilabel_cnt += 1;
      } else {
	&Apache::lonxml::error('Unknown type of label :'.$type.':');
      }
      my $x = $Apache::randomlabel::xcoord[$_];
      my $y = $Apache::randomlabel::ycoord[$_];
      $result .= '<param name="' . $str  . '" value="'.$label.'">';
      $result .= '<param name="' . $xstr . '" value="'.$x.'">';
      $result .= '<param name="' . $ystr . '" value="'.$y.'">';
    }
  } elsif ($target eq 'tex') {
    my $WX1=0; #  Web x-coord. of upper left corner (ULC)
    my $WY1=0; #  Web y-coord. of (ULC)
    my $wwidth=&Apache::lonxml::get_param('width',$parstack,$safeeval,-2);
    my $wheight=&Apache::lonxml::get_param('height',$parstack,$safeeval,-2);
    my $texwidth=&Apache::lonxml::get_param('texwidth',$parstack,$safeeval,-2);
    my $TX1=0;
    my $TY1=$texwidth*($wheight/$wwidth);
    my $TX2=$texwidth;
    my $TY2=0;


    my $slopex=($wwidth-$WX1)/($TX2-$TX1);
    my $slopey=($wheight-$WY1)/($TY2-($TY1-1.0));
    my $cstx=$wwidth-$slopex*($TX2);
    my $csty=$wheight-$slopey*($TY2);

    my @idx_arr = (0 .. $#Apache::randomlabel::label_arr);
    &Apache::structuretags::shuffle(\@idx_arr);

    &Apache::lonxml::debug("Array is:".$#Apache::randomlabel::label_arr.":");
    for(my $i=0;$i <= $#Apache::randomlabel::label_arr; $i++) {
      my $label = "$Apache::randomlabel::label_arr[ $idx_arr[$i] ]";
      my $x = $Apache::randomlabel::xcoord[$i];
      my $y = $Apache::randomlabel::ycoord[$i];
      my $tcX=$x*($texwidth/$wwidth);
      my $tcY=$TY1-$y*($TY1/$wheight)-2;
      $tcX=sprintf('%.2f',$tcX);
      $tcY=sprintf('%.2f',$tcY);
      $result.='\put('.$tcX.','.$tcY.'){\normalsize \bf '.$label.'}'."\n";
      if( $type eq 'text') {
	&add_var($gname,$label,'array',$safeeval);
      } elsif ( $type eq 'image') {
	&add_var($gname,$idx_arr[$i],'array',$safeeval);
      } else {
	&Apache::lonxml::error('Unknown type of label :'.$type.':');
      }
    }
  } elsif ($target eq 'edit') {
    $result.=&Apache::edit::end_table;
  }
  return $result;
}

# <location x=123 y=456 />
sub start_location {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $x= &Apache::lonxml::get_param('x',$parstack,$safeeval);
  my $y= &Apache::lonxml::get_param('y',$parstack,$safeeval);
  my $result='';
  push(@Apache::randomlabel::xcoord,$x);
  push(@Apache::randomlabel::ycoord,$y);
  if ($target eq 'edit') {
    $result.=&Apache::edit::tag_start($target,$token);
    $result.=&Apache::edit::text_arg('X:','x',$token,4).
      &Apache::edit::text_arg('Y:','y',$token,4).
	'</td></tr><tr><td colspan="3">';
    $result.=&Apache::edit::end_table;
  } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
						 'x','y');
    if ($constructtag) {
      $result = &Apache::edit::rebuild_tag($token);
      $result.=&Apache::edit::handle_insert();
    }
  }
  return $result;
}

sub end_location {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my @result;
  if ($target eq 'edit') { @result=('','no') }
  return @result;
}

# <label>$var_abc</label>
sub start_label {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $result='';
  if ($target eq 'web' || $target eq 'tex') {
    my $ltext=&Apache::lonxml::get_all_text("/label",$$parser[-1]);
    push(@Apache::randomlabel::label_arr,$ltext);
  } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_start($target,$token);
    my $text=&Apache::lonxml::get_all_text("/label",$$parser[-1]);
    $result.='</td></tr><tr><td colspan="3">'.
      &Apache::edit::editfield('',$text,'',20,1).
	&Apache::edit::end_table();
  } elsif ($target eq 'modified') {
    my $text=$$parser[-1]->get_text("/label");
    $result.=&Apache::edit::modifiedfield($token);
  }
  return $result;
}

sub end_label {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my @result;
  if ($target eq 'edit') { @result=('','no') }
  return @result;
}



1;
__END__