use warnings;
use CGI;
use JSON::XS;
-use lib '.';
+use lib '..';
use Position;
-require 'ECO.pm';
-
-#ECO::unpersist();
+use IPC::Open2;
my $cgi = CGI->new;
my $fen = $ARGV[0];
+my $filter_prev_pos_hash = $ARGV[1] // 0;
+my ($chld_out, $chld_in);
+my $pid = IPC::Open2::open2($chld_out, $chld_in, "./binlookup", "./open.mtbl", "40");
+
+# Root position.
my $pos = Position->from_fen($fen);
-my $hex = unpack('H*', $pos->bitpacked_fen);
-system("./binlookup", "./open.mtbl", $hex);
+my $bpfen_hex = unpack('H*', $pos->bitpacked_fen);
+my $prev_pos_hash_hex = unpack('H*', pack('S', $filter_prev_pos_hash));
+print $chld_in $bpfen_hex, "\n", $prev_pos_hash_hex, "\n";
+
+chomp (my $line = <$chld_out>); # Root position hash.
+print $line, "\n";
+
+chomp ($line = <$chld_out>); # Actual stats.
+print $line, "\n";
+my ($white, $draw, $black, $opening_num, $white_avg_elo, $black_avg_elo, $num_elo, $timestamp, $pgn_file_number, $pgn_start_position, @moves) = split / /, $line;
+# Explore one move out.
+for my $move (@moves) {
+ my ($np, $uci_move) = $pos->make_pretty_move($move);
+ my $hex = unpack('H*', $np->bitpacked_fen);
+ print $chld_in $hex, "\n\n";
+ my $line = <$chld_out>; # Ignore position hash.
+ $line = <$chld_out>;
+ print "$move $line";
+}