#!/usr/bin/perl
#
# Copyright (C) 2021 Felix Lechner
#
# 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 2 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, you can find it on the World Wide
# Web at https://www.gnu.org/copyleft/gpl.html, or write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.

use v5.20;
use warnings;
use utf8;

use Cwd qw(realpath);
use File::Basename qw(dirname);

# neither Path::This nor lib::relative are in Debian
use constant THISFILE => realpath __FILE__;
use constant THISDIR => dirname realpath __FILE__;

# use Lintian modules that belong to this program
use lib THISDIR . '/../lib';

use Const::Fast;
use List::Compare;
use List::Util qw(uniq);
use Unicode::UTF8 qw(encode_utf8);

use Lintian::Archive;
use Lintian::Profile;

const my $SPACE => q{ };
const my $INDENT => $SPACE x 4;
const my $HYPHEN => q{-};

$ENV{LINTIAN_BASE} = realpath(THISDIR . '/..')
  // die encode_utf8('Cannot resolve LINTIAN_BASE');

refresh_auto_reject_data();

# reload
my $profile = Lintian::Profile->new;
$profile->load;

my $data = $profile->data;

my @want_certain = @{$data->auto_rejection->certain};
my @want_preventable = @{$data->auto_rejection->preventable};

# find all tags known to Lintian
my @known_tags = $profile->known_tags;
my %new_name;

for my $tag_name (@known_tags) {

    my $tag = $profile->get_tag($tag_name);

    my @renamed_from = @{$tag->renamed_from};

    my @taken = grep { exists $new_name{$_} } @renamed_from;

    say encode_utf8(
"Warning: Ignoring $_ as an alias for $new_name{$_} in favor of $tag_name."
    )for @taken;

    $new_name{$_} = $tag_name for @renamed_from;
}

my $old_certain_lc= List::Compare->new(\@want_certain, [keys %new_name]);
my $old_preventable_lc
  = List::Compare->new(\@want_preventable, [keys %new_name]);

my @old_certain_names = $old_certain_lc->get_intersection;
my @old_preventable_names = $old_preventable_lc->get_intersection;

say encode_utf8('FTP Master uses those old tag names for auto-rejection:')
  if @old_certain_names || @old_preventable_names;
say encode_utf8($INDENT . "-   [certain]   $_  =>  $new_name{$_}")
  for @old_certain_names;
say encode_utf8($INDENT . "- [preventable] $_  =>  $new_name{$_}")
  for @old_preventable_names;

my $new_certain_lc
  = List::Compare->new(\@want_certain,
    [map { $new_name{$_} } @old_certain_names]);
my $new_preventable_lc
  = List::Compare->new(\@want_preventable,
    [map { $new_name{$_} } @old_preventable_names]);

my @aware_certain_names = $new_certain_lc->get_intersection;
my @aware_preventable_names = $new_preventable_lc->get_intersection;

say encode_utf8('They already know about those tags:')
  if @aware_certain_names || @aware_preventable_names;
say encode_utf8($INDENT . "-   [certain]   $_") for @aware_certain_names;
say encode_utf8($INDENT . "- [preventable] $_") for @aware_preventable_names;

my @unaware_certain_names = $new_certain_lc->get_Ronly;
my @unaware_preventable_names = $new_preventable_lc->get_Ronly;

say encode_utf8('The following tags have to be added:')
  if @unaware_certain_names || @unaware_preventable_names;
say encode_utf8($INDENT . "-   [certain]   $_") for @unaware_certain_names;
say encode_utf8($INDENT . "- [preventable] $_") for @unaware_preventable_names;

# replace old names
@want_certain = uniq map { $new_name{$_} // $_ } @want_certain;
@want_preventable = uniq map { $new_name{$_} // $_ } @want_preventable;

my $certain_lc = List::Compare->new(\@want_certain, \@known_tags);
my @unknown_certain = $certain_lc->get_Lonly;
my @certain = $certain_lc->get_intersection;

my $preventable_lc = List::Compare->new(\@want_preventable, \@known_tags);
my @unknown_preventable = $preventable_lc->get_Lonly;
my @preventable = $preventable_lc->get_intersection;
my @unknown = (@unknown_certain, @unknown_preventable);

say encode_utf8(
    'Warning, disregarding unknown tags for FTP Master Auto-Rejects:')
  if @unknown;
say encode_utf8($INDENT . $HYPHEN . $SPACE . $_) for @unknown;

say encode_utf8('Found '
      . scalar @certain
      . ' certain and '
      . scalar @preventable
      . ' preventable tags for FTP Master Auto-Rejects.');

exit 0;

sub refresh_auto_reject_data {

    my $refresh_profile = Lintian::Profile->new;
    $refresh_profile->load;

    my $refresh_data = $refresh_profile->data;

    my $archive = Lintian::Archive->new;
    my $basedir = "$ENV{LINTIAN_BASE}/data";

    # refresh data
    $refresh_data->auto_rejection->refresh($archive, $basedir);

    undef $refresh_profile;
    undef $refresh_data;

    return;
}

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# indent-tabs-mode: nil
# cperl-indent-level: 4
# End:
# vim: syntax=perl sw=4 sts=4 sr et