#!/usr/bin/perl

use strict;
use warnings;

use Cwd;
use DBI;

my $photos_root = $ENV{HOME} . '/photos';

my $album = $ARGV[0];
if (!defined $album) {
	my $cwd = getcwd;
	$cwd =~ m{/photos/(.*)} or die "Cannot identify album from current directory, need to specify maunally.\n";
	$album = $1;
}

if (! -f "gallery.cf") {
	system 'gal', 'mj-init'; die if $?;
}

my $dbfile = "$photos_root/digikam4.db";
my $dbh = DBI->connect("dbi:SQLite:dbname=$dbfile", "", "") or die "Cannot access $dbfile\n";

my %alba = ();
for my $r (@{$dbh->selectall_arrayref(
	'SELECT a.id AS id, r.label AS label, a.relativePath AS rpath FROM Albums a JOIN AlbumRoots r ON (r.id = a.albumRoot)',
	{ Slice => {} })}) {
	my $name = $r->{label} . $r->{rpath};
	# print "$name\n";
	$alba{$name} = $r->{id};
}

my $album_id = $alba{$album} // die "Unknown album $album\n";
print "## Album $album: id=$album_id\n";

my ($tag_id) = $dbh->selectrow_array('SELECT id FROM Tags WHERE pid=0 AND name="web"');
$tag_id // die "Cannot find web tag\n";
print "## Tag ID: $tag_id\n";

open OUT, '|-', $ENV{GALLERY_ROOT} . '/bin/gal-scan' or die "Cannot feed gal scan\n";
for my $r (@{$dbh->selectall_arrayref(
	'SELECT i.name AS name FROM Images i JOIN ImageTags t ON (i.id = t.imageid) WHERE i.album=? AND t.tagid=? ORDER BY i.name',
	{ Slice => {} },
	$album_id, $tag_id)}) {
	print OUT "$photos_root/$album/" . $r->{name}, "\n";
}
close OUT;