#!/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 IPC::Open2;
use IO::Handle;
use File::Temp;

#---------- 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 $summary= pipeval($ppm,
			 'set -x; cat >&2',
			 'ppmtopgm',
			 'pnmscale -width 79',
			 'pnmnorm -bpercent 40 -wpercent 10',
			 'pgmtopbm -threshold');
    print STDERR ">$summary<\n";
    

# <ship-ahoy.ppm ppmtopgm | pnmscale -width 79 | pnmnorm -bpercent 40 -wpercent 10 | pgmtopbm -threshold | pbmtoascii | cut -c1-79
	
    my $entry= "$def\n$ppm";
    return ('',$def,$entry);
}

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

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

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

    my $paste_child= open PIPEVAL_PASTE, "-|";
    defined $paste_child or die $!;
    if (!$paste_child) { print $val or die $!; exit 0; }

    my $f= 'PIPEVAL_PASTE';

$_=<$f>;
print STDERR ">$_<\n";

    foreach my $cmd (@cmds) {
	my $newf;
print STDERR "$cmd | $f\n";
	push @pids, open2($newf, "<& $f", $cmd);
#	if (@pids>1) { close $f or die $!; }
print STDERR "$cmd | $f $newf @pids\n";
	$f= $newf;
    }

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

    waitpid($paste_child,0) == $paste_child or die "paste $? $!";
    $?==0 or $?==13 or die "paste $?";
    close PIPEVAL_PASTE or die $!;

    foreach my $cmd (@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 $?;

my $kind;

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

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

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

Context:    $kind $ctx
Definition: $def

END
    ;