#!/usr/bin/perl

# This file is part of Koha.
#
# Koha 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.
#
# Koha 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 Koha; if not, see <http://www.gnu.org/licenses>.

=head1 NAME

xgettext-pref - extract translatable strings from system preferences YAML files

=head1 SYNOPSIS

xgettext-pref [OPTION] [INPUTFILE]...

=head1 OPTIONS

=over

=item B<-f, --files-from=FILE>

get list of input files from FILE

=item B<-o, --output=FILE>

write output to the specified file

=item B<-h, --help>

display this help and exit

=back

=cut

use Modern::Perl;

use File::Basename;
use Getopt::Long;
use Locale::PO;
use Pod::Usage;
use YAML::XS;

my $output = 'messages.pot';
my $files_from;
my $help;

GetOptions(
    'output=s' => \$output,
    'files-from=s' => \$files_from,
    'help' => \$help,
) or pod2usage(-verbose => 1, -exitval => 2);

if ($help) {
    pod2usage(-verbose => 1, -exitval => 0);
}

my @files = @ARGV;
if ($files_from) {
    open(my $fh, '<', $files_from) or die "Cannot open $files_from: $!";
    push @files, <$fh>;
    chomp @files;
    close $fh;
}

my $pot = {
    '' => Locale::PO->new(
        -msgid  => '',
        -msgstr => "Project-Id-Version: Koha\n"
          . "PO-Revision-Date: YEAR-MO-DA HO:MI +ZONE\n"
          . "Last-Translator: FULL NAME <EMAIL\@ADDRESS>\n"
          . "Language-Team: Koha Translate List <koha-translate\@lists.koha-community.org>\n"
          . "MIME-Version: 1.0\n"
          . "Content-Type: text/plain; charset=UTF-8\n"
          . "Content-Transfer-Encoding: 8bit\n"
    ),
};

for my $file (@files) {
    my $pref = YAML::XS::LoadFile($file);
    while ( my ($tab, $tab_content) = each %$pref ) {
        add_po(undef, basename($file));

        if ( ref($tab_content) eq 'ARRAY' ) {
            add_prefs( $file, $tab, $tab_content );
        } else {
            while ( my ($section, $sysprefs) = each %$tab_content ) {
                my $context = "$tab > $section";
                my $msgid = sprintf('%s %s', basename($file), $section);
                add_po($tab, $msgid);
                add_prefs( $file, $context, $sysprefs );
            }
        }
    }
}

Locale::PO->save_file_fromhash($output, $pot, 'utf8');

sub add_prefs {
    my ($file, $context, $prefs) = @_;

    for my $pref (@$prefs) {
        my $pref_name = '';
        for my $element (@$pref) {
            if ( ref($element) eq 'HASH' ) {
                $pref_name = $element->{pref};
                last;
            }
        }
        for my $element (@$pref) {
            if ( ref($element) eq 'HASH' ) {
                while ( my ( $key, $value ) = each(%$element) ) {
                    next unless $key eq 'choices' or $key eq 'multiple';
                    next unless ref($value) eq 'HASH';
                    for my $ckey ( keys %$value ) {
                        my $msgid = sprintf('%s#%s# %s', basename($file), $pref_name, $value->{$ckey});
                        add_po( "$context > $pref_name", $msgid );
                    }
                }
            }
            elsif ($element) {
                my $msgid = sprintf('%s#%s# %s', basename($file), $pref_name, $element);
                add_po( "$context > $pref_name", $msgid );
            }
        }
    }
}

sub add_po {
    my ($comment, $msgid ) = @_;

    return unless $msgid;

    $pot->{$msgid} = Locale::PO->new(
        -comment   => $comment,
        -msgid     => $msgid,
        -msgstr    => '',
    );
}