#!/usr/bin/perl -w
#
# This script is invoked when the YPP SC PCTB client phones home to
# provide updated character set OCR data or updated screenshot pixmap
# interpretation (island name) data.
#
# The client will also phone home anyway to fetch the latest parsedb
# before 
#
# This allows me (the operator of the SC server) to:
#    - review the choices made by the user
#    - if they are correct, incorporate them in the next client version
#    - if they are wrong, incorporate fixes of them, or contradictions of them,
#      in

# The information reported 
# The SC PCTB client does this so that 

use strict (qw(vars));

$CGI::POST_MAX= 65536;
$CGI::DISABLE_UPLOADS= 1;

use CGI qw/:standard -private_tempfiles/;
use IO::Pipe;
use IO::Handle;

#---------- pixmaps ----------

sub parseentryin__pixmap ($) {
    my ($entry_in) = @_;
    $entry_in =~
	m/^(\w+ \- \w[-+'"#! 0-9a-z]*)\nP3\n([1-9]\d{1,3}) ([1-9]\d{1,3})\n255\n/s or die; # ']);
    my ($def,$w,$h)= ($1, $2+0, $3+0);
    my @d= grep { m/./ } split /\s+/, $';
    @d == $w*$h*3 or die "$d[0]|$d[1]|...|$d[$#d-1]|$d[$#d] ?";
    map {
	m/\D/ and die "$& ?";
	$_ += 0;
	$_ >= 0 or die "$_ ?";
	$_ <= 255 or die "$_ ?";
    } @d;
    my $ppm= "P3\n$w $h\n255\n";
    my $di=0;
    for (my $y=0; $y<$h; $y++) {
	for (my $x=0; $x<$w; $x++, $di+=3) {
#print STDERR ">$x,$y,$di,",scalar(@d),"<\n";
	    $ppm .= sprintf "  %3d %3d %3d", @d[$di..$di+2];
	}
	$ppm .= "\n";
    }

    my $icon= pipeval($ppm,
			 'ppmtopgm',
			 'pnmscale -xysize 156 80',
			 'pnmnorm -bpercent 40 -wpercent 20',
			 'pgmtopbm -threshold',
			 'pnminvert',
			 'pbmtoascii -2x4');

    my $whole= pipeval($ppm,
		       'ppmtopgm',
		       'pnmnorm -bpercent 40 -wpercent 20',
		       'pgmtopbm -threshold',
		       'pnminvert',
		       'pbmtoascii');
    
    my $entry= "$def\n$ppm";
    return ('',$def,$entry,$icon,$w,$whole);
}

#---------- characters ----------

sub parseentryin__char ($) {
    my ($ei) = @_;
    $ei =~ m/^([1-9]\d{0,2})\n(Digit|Upper|Lower)\n((?:[-&\'A-F0-9a-f ]|\x20)+)\n/s or die;
    my ($h,$ctx,$str)= ($1+0,$2,$3);
#print STDERR ">$'<\n";
    my @d= grep { m/./ } split /\n/, $';
#print STDERR ">@d<\n";
    die if $h>31;
    die if @d>400;
    my $maxval= (1<<$h)-1;
    map {
	m/^[0-9a-f]{1,8}$/ or die;
	$_= hex $_;
	die "$_ ?" if $_ > $maxval;
    } @d;
    my $w= @d;
    my $ppm= "P2\n$w $h\n1\n";
    for (my $y=0; $y<$h; $y++) {
	for (my $x=0; $x<$w; $x++) {
	    $ppm .= sprintf " %d", !!($d[$x] & (1<<$y));
	}
	$ppm .= "\n";
    }
    my $entry= sprintf "%d\n%s\n%s\n", $h,$ctx,$str;
    map { $entry .= sprintf "%x\n", $_; } @d;
    
#print STDERR "[[[[\n$ppm\n]]]]";

    my $icon= pipeval($ppm,
#		      "pnmscale -xysize 78 $h",
		      'pgmtopbm -threshold',
		      'pnminvert',
		      'pbmtoascii');

    return ("$ctx",$str,$entry, '',$w,$icon);
}

#---------- useful stuff ----------

sub pipeval ($@) {
    my ($val, @cmds) = @_;
    my (@pids);

    my $lastpipe;
    
    foreach my $cmd ('',@cmds) {
	my $pipe= new IO::Pipe or die $!;
	my $pid= fork();  defined $pid or die $!;

	if (!$pid) {
	    $pipe->writer();
	    if (!$lastpipe) {
		 print $pipe $val or die $!;
		 exit 0;
	     } else {
		 open STDIN, '<&', $lastpipe or die $!;
		 open STDOUT, '>&', $pipe or die $!;
		 close $lastpipe or die $!;
		 close $pipe or die $!;
		 exec $cmd; die $!;
	     }
	}
	$pipe->reader();
	if ($lastpipe) { close $lastpipe or die $!; }
	$lastpipe= $pipe;
	push @pids, $pid;
    }

    $!=0; { local ($/)=undef; $val= <$lastpipe>; }
    defined $val or die $!;
    $lastpipe->error and die $!;  close $lastpipe or die $!;

    foreach my $cmd ('(paste)', @cmds) {
	my $pid= shift @pids;
	waitpid($pid,0) == $pid or die "$pid $? $!";
	$?==0 or $?==13 or die "$cmd $?";
    }
    return $val;
}

#---------- main program ----------

my $path= path_info();
my $entry_in= param('entry');
defined $entry_in or die;

my $owner= `whoami`; $? and die $?;
chomp $owner;

my $kind;

if ($path =~ /(pixmap|char)/) {
    $kind=$1;
} else {
    die "$path ?";
}

my ($ctx,$def,$entry,$icon,$width,$whole)= &{"parseentryin__$kind"}($entry_in);

$icon =~ s/^/ /mg;

my $email= <<END
To: $owner
Subject: yppsc dictionary update

Context:    $kind $ctx
Definition: $def

$icon

END
    ;

$whole =~ s/(.*)\n/ sprintf "%-${width}s\n", $1 /mge;
$whole =~ s/^/|/mg;
$whole =~ s/\n/|\n/mg;
$whole =~ s/^(.*)/ ",".('_' x $width).".\n".$1 /e;
$whole =~ s/(.*)$/ $1."\n\`".('~' x $width)."'\n" /e;

my $lw= 79;

while ($whole =~ m/../) {
    my $lhs= $whole;
    $lhs =~ s/^(.{0,$lw}).*$/$1/mg;
    $whole =~ s/^.{1,$lw}//mg;
#print STDERR "[[[[[$lhs########$whole]]]]]\n";
    $email .= $lhs;
}

END
    ;

my $cutline= "-8<-\n";
$email .= $cutline.$entry.$cutline;

print $email or die $!;