#!@PERL@

use strict;

my $prefix      = "@prefix@";
my $exec_prefix = "@exec_prefix@";
my $datarootdir = "@datarootdir@";
my $DATADIR     = "@datadir@/@PACKAGE@";

my $CONVERT  = "@CONVERT@";
my $IDENTIFY = "@IDENTIFY@";
my $OPTIPNG  = "@OPTIPNG@";
my $RSYNC    = "@RSYNC@";

use Getopt::Long;
use Coro::Event;
use AnyEvent;
use IO::AIO ();
use File::Temp;
use Crossfire;
use Coro;
use Coro::AIO;
use POSIX ();

sub usage {
   warn <<EOF;
Usage: cfutil [-v] [-q] [--force] [--cache]
              [--install-arch path]
              [--install-maps maps]
              [--print-statedir]
              [--print-confdir]
              [--print-datadir]
              [--print-libdir]
              [--print-bindir]
EOF
   exit 1;
}

my $VERBOSE = 1;
my $CACHE = 0;
my $FORCE;
my $TMPDIR  = "/tmp/cfutil$$~";
my $TMPFILE = "aaaa0";

END { system "rm", "-rf", $TMPDIR }

Event->signal (signal => "INT",  cb => sub { exit 1 });
Event->signal (signal => "TERM", cb => sub { exit 1 });

mkdir $TMPDIR, 0700
   or die "$TMPDIR: $!";

sub fork_sub(&) {
   my ($cb) = @_;

   if (my $pid = fork) {
      my $current = $Coro::current;
      my $w = AnyEvent->child (pid => $pid, cb => sub { $current->ready });
      Coro::schedule;
   } else {
      eval { $cb->() };
      POSIX::_exit 0 unless $@;
      warn $@;
      POSIX::_exit 1;
   }
}

sub inst_maps($) {
   my (undef, $path) = @_;

   print "installing '$path' to '$DATADIR/maps'\n\n";

   if (!-f "$path/regions") {
      warn "'$path' does not look like a maps directory ('regions' file is missing).\n";
      exit 1 unless $FORCE;
   }

   system $RSYNC, "-av", "$path/.", "$DATADIR/maps/.", "--delete", "--exclude", "CVS", "--delete-excluded";
}

{
   our @PNG;
   our @ARC;
   our $NFILE;

   our (@png, @trs, @arc); # files we are interested in

   sub commit_png {
      my ($name, $data) = @_;
      #warn "$name: commited\n";
   }

   sub process_png {
      while (@png) {
         my $path = pop @png;

         my $png;
         aio_lstat $path;
         my ($size, $mtime) = (stat _)[7,9];

         if (0 > aio_load $path, $png) {
            warn "$path: $!, skipping.\n";
            return;
         }

         # quickly extratc width and height of the (necessarily PNG) image
         unless ($png =~ /^\x89PNG\x0d\x0a\x1a\x0a....IHDR(........)/s) {
            warn "$path: not a recongized png file, skipping.\n";
            return;
         }

         my ($w, $h) = unpack "NN", $1;

         (my $face = $path) =~ s/^.*\///;
         my $T = 32;

         unless ($face =~ s/\.base\.(...)\.png$/.$1/) {
            warn "$path: weird filename, skipping.\n";
            return;
         }

         if ($w < $T || $h < $T) {
            warn "$path: too small ($w $h), skipping.\n";
            return;
         }

         if ($w % $T || $h % $T) {
            warn "$path: weird png size ($w $h), skipping.\n";
            return;
         }

         if (($w > $T || $h > $T) && $face !~ /_S\./) {
            # split
            my @tile;
            for my $x (0 .. (int $w / $T) - 1) {
               for my $y (0 .. (int $h / $T) - 1) {
                  my $file = "$path+$x+$y~";
                  aio_lstat $file;
                  push @tile, [$x, $y, $file, (stat _)[9]];
               }
            }

            my $mtime = (lstat $path)[9];
            my @todo = grep { $_->[3] <= $mtime } @tile;
            if (@todo) {
               fork_sub {
                  open my $convert, "|-", $CONVERT,
                     "png:-",
                     (map {
                        (
                           "(",
                           "+clone",
                           -crop => (sprintf "%dx%d+%d+%d", $T, $T, $_->[0] * $T, $_->[1] * $T),
                           -write => "png:$_->[2]~",
                           "+delete",
                           ")",
                        )
                     } @todo),
                     "null:";

                  binmode $convert;
                  print $convert $png;
                  close $convert;

                  # pass 2, optimise, and rename
                  for (@todo) {
                     system $OPTIPNG, "-o5", "-i0", "-q", "$_->[2]~";
                     rename "$_->[2]~", $_->[2];
                  }
               };
            }

            for (@tile) {
               my ($x, $y, $file) = @$_;
               my $tile;

               if (0 > aio_load $file, $tile) {
                  die "$path: unable to read tile +$x+$y, aborting.\n";
               }
               IO::AIO::aio_unlink $file unless $CACHE;
               commit_png $x|$y ? "$face+$x+$y" : $face, $tile;
            }
         } else {
            # use as-is (either small, use smooth)
            commit_png $face, $png;
         }
      }
   }

   sub process_arc {
      while (@arc) {
         my ($dir, $file) = @{pop @arc};

         my $arc;
         aio_load "$dir/$file", $arc; # simply pre-cache, as read_arch wants a file :/

         my $arc = read_arch "$dir/$file";
         for my $o (values %$arc) {
            push @ARC, $o;
            my ($dx, $dy);
            # omg, this is sooo broken
            for (my $o = $o; $o; $o = $o->{more}) {
               $dx = $o->{x} if $o->{x} < $dx;
               $dy = $o->{y} if $o->{y} < $dy;
            }
            for (my $o = $o; $o; $o = $o->{more}) {
               my $x = $o->{x} - $dx;
               my $y = $o->{y} - $dy;
               if ($x|$y) {
                  $_ .= "+$x+$y" for $o->{face}, @{$o->{anim} || []};
               }
            }
         }
      }
   }

   sub process_trs {
      while (@trs) {
         my ($dir, $file) = @{pop @trs};
      }
   }

   sub find_files;
   sub find_files {
      my ($path) = @_;

      IO::AIO::aioreq_pri 4;
      IO::AIO::aio_scandir $path, 4, sub {
         my ($dirs, $nondirs) = @_;

         find_files "$path/$_"
            for grep $_ !~ /^(?:CVS|dev)$/, @$dirs;

         for my $file (@$nondirs) {
            if ($file =~ /\.png$/) {
               push @png, "$path/$file";
            } elsif ($file =~ /\.trs$/) {
               push @trs, [$path, $file];
            } elsif ($file =~ /\.arc$/) {
               push @arc, [$path, $file];
            } else {
               warn "ignoring $path/$file\n" if $VERBOSE >= 2;
            }
         }
      };
   }

   sub inst_arch($) {
      my (undef, $path) = @_;

      print "installing '$path' to '$DATADIR'\n\n";

      if (!-d "$path/treasures") {
         warn "'$path' does not look like an arch directory ('treasures' directory is missing).\n";
         exit 1 unless $FORCE;
      }

      find_files $path;
      IO::AIO::flush;

      $_->join for (
         (async \&process_png), (async \&process_png),
         (async \&process_trs), (async \&process_trs),
         (async \&process_arc), (async \&process_arc),
      );

      open my $archetypes, ">:utf8", "$DATADIR/archetypes~"
         or die "$DATADIR/archetypes~: $!";
      print $archetypes Crossfire::archlist_to_string \@ARC;
      close $archetypes;
      rename "$DATADIR/archetypes~", "$DATADIR/archetypes";

      die "--install-arch not fully implemented\n";
   }
}

Getopt::Long::Configure ("bundling", "no_ignore_case");
GetOptions (
   "verbose|v:+"    => \$VERBOSE,
   "cache"          => \$CACHE,
   "quiet|q"        => sub { $VERBOSE = 0 },
   "force"          => sub { $FORCE = 1 },
   "install-arch=s" => \&inst_arch,
   "install-maps=s" => \&inst_maps,
   "print-statedir" => sub { print "@pkgstatedir@\n" },
   "print-datadir"  => sub { print "$DATADIR\n" },
   "print-confdir"  => sub { print "@pkgconfdir@\n" },
   "print-libdir"   => sub { print "@libdir@/@PACKAGE@\n" },
   "print-bindir"   => sub { print "@bindir@/@PACKAGE@\n" },
) or usage;