#!/usr/bin/perl -w
#
# This script is invoked when the YPP SC PCTB client talks to the
# dictionary server.  See README.privacy.

# This is part of ypp-sc-tools, a set of third-party tools for assisting
# players of Yohoho Puzzle Pirates.
#
# Copyright (C) 2009 Ian Jackson <ijackson@chiark.greenend.org.uk>
#
# This program 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 3 of the License, or
# (at your option) any later version.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Yohoho and Puzzle Pirates are probably trademarks of Three Rings and
# are used without permission.  This program is not endorsed or
# sponsored by Three Rings.


# upload testing runes:
#
# YPPSC_PCTB_DICT_UPDATE=./ YPPSC_PCTB_DICT_SUBMIT=./ ./ypp-commodities --ocean midnight --pirate aristarchus --find-island --same --raw-tsv >raw.tsv  
# ./dictionary-manager --debug --approve-updates '' . .

use strict (qw(vars));
use POSIX;

$CGI::POST_MAX= 1024*1024;
$CGI::DISABLE_UPLOADS= 1;

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

my $aadepth=2;

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

sub parseentryin__pixmap ($) {
    my ($entry_in) = @_;
    $entry_in =~
	m/^(\S+ \- .*)\nP3\n([1-9]\d{1,3}) ([1-9]\d{1,3})\n255\n/s or die;
    my ($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 10 -wpercent 5',
		       'pgmtopbm -threshold',
		       'pnminvert',
		       'pbmtoascii');

    my $entry= "$def\n$ppm";

    return ('',$def,$ppm,$ppm,$def, $w,$icon,$whole,$entry);
}

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

sub parseentryin__char ($$) {
    my ($ei,$h) = @_;
    $ei =~ m/^(Digit|Upper|Lower|Word)\n([^\n]+)\n/s or die;
    my ($ctx,$str)= ($1,$2);
print STDERR ">ctx=$ctx|str=$str|$'<\n";
    my @d= grep { m/./ } split /\n/, $';
print STDERR ">@d<\n";
    die if $h>100;
    die if @d>400;

    my $w= @d;

    my $maxval= (1<<$aadepth)-1;
    die 'cannot do [^0...$maxval]!' if $maxval>9;

    my $pgm= "P2\n$h $w\n$maxval\n";
    map { # x, left to right
	m/[^0-$maxval]/ and die "$_ ?";
	my $l= $_;
	$l =~ s/./ $&/g;
	$pgm .= "$l\n";
    } @d;

    my $key= join ' ', $ctx, @d;

    $pgm= pipeval($pgm,
		  "pnmflip -xy",
		  "pnmnoraw");

    my $icon= pipeval($pgm,
		      "pnmscale -xysize 156 ".($h*4),
		      'pgmtopbm -threshold',
		      'pnminvert',
		      'pbmtoascii -2x4');

    my $whole= pipeval($pgm,
		       "pnmscale 4",
		       'pgmtopbm -fs',
		       'pnminvert',
		       'pbmtoascii');

    my $entry= "$ctx\n$str\n$key\n";
    
    return ($ctx,$str,$pgm,$key,$str, $w*4,$icon,$whole,$entry);
}

#---------- 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 ==========

#---------- determine properties of the submission ----------

my $version= param('version');
my $spec_aadepth= param('depth');
if ($version ne '3'  ||  $spec_aadepth ne $aadepth) {
    print header('text/plain',
		 "403 YPP SC PCTB client is out of date".
		 " ($version, $spec_aadepth)");
    print "\nYour YPP SC client is out of date.\n";
    exit 0;
}

my $dict= param('dict');
my $entry_in= param('entry');
defined $entry_in or die Dump()." ?";

my $ocean= param('ocean');
my $pirate= param('pirate');
if (defined $ocean && defined $pirate) {
    $pirate= "$ocean - $pirate";
} else {
    $pirate= '';
}

my $caller= $ENV{'REMOTE_ADDR'};
$caller= 'LOCAL' unless defined $caller;

my $fwdf= $ENV{'HTTP_X_FORWARDED_FOR'};
if (defined $fwdf) {
    $fwdf =~ s/\s//g;
    $fwdf =~ s/[^0-9.,]/?/g;
    $caller= "$fwdf,$pirate";
}

my $kind;
my @xa;

if ($dict =~ m/^pixmap$/) {
    $kind= $&;
} elsif ($dict =~ m/^(char)([1-9]\d?)$/) {
    ($kind,@xa)= ($1,$2);
} else {
    die "$dict ?";
}
$dict= $&;

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

my $du=$ENV{'YPPSC_DICTUPDATES'};
chdir $du or die "$du $!"
    if defined $du;

my $instance= $du;
$instance =~ s,ypp-sc-tools,,ig;
$instance =~ s,ypp,,ig;
$instance =~ s,pctb,,ig;
$instance =~ s,/\W+/,/,g;
$instance =~ s,/+$,,;
$instance =~ s,^.*/,,;

#---------- compute the email to send ----------

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

my $email= <<END
To: $whoami
Subject: pctb /$instance/ $dict $ctx $def [ypp-sc-tools]

Pirate:     $pirate
Caller:     $caller
Dictionary: $dict
Context:    $ctx
Definition: $def

END
    ;

if (length $icon) {
    $icon =~ s/^/ /gm;
    $email .= "$icon\n\n";
}

$whole =~ s/(.*)\n/ sprintf "%-${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;

#---------- prepare the database entry ----------

my $fn_t= "_update.$$-xxxxxxxxxxxxxxxx.tmp";
open F, "> $fn_t" or die "$fn_t $!";
(stat F) or die $!;
my $fn_i= sprintf "_update.$$-%016x.rdy", (stat _)[1];

print F "ypp-sc-tools dictionary update v3 depth=$aadepth\n";

foreach my $v ($pirate,$caller,$dict,$ctx,$def,$image,$key,$val) {
    printf F "%d\n", length($v) or die $!;
    print F $v,"\n" or die $!;
}

close F or die $!;

my @tm= localtime;
my $tm= strftime "%Y-%m-%d %H:%M:%S %Z", @tm;

open L, ">> _dict.log" or die $!;
my $ll= sprintf "%s %-6s %-31s %-31s %s", $tm, $dict, $pirate, $caller, $fn_i;

#---------- commit everything ----------

print L "$ll submit\n" or die $!;
L->flush or die $!;

if (eval {

    open S, "|/usr/lib/sendmail -odb -oee -oi -t" or die $!;
    print S $email or die $!;
    $!=0; $?=0; close S or die $!; $? and die $?;

    rename $fn_t, $fn_i or die "$fn_t $fn_i $!";

    1;
}) {
    print L "$ll stored\n" or die $!;
} else {
    print L "$ll ERROR! $@\n" or die $!;
    exit 1;
}
close L or die $!;

print header('text/plain'), "OK $fn_i\n" or die $!;