#!/usr/bin/perl
#
# Write dependency list from Koha PerlDependencies.pm, in Debian format.
#
# Copyright 2010  Catalyst IT, Ltd
#
# 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 3 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, see <http://www.gnu.org/licenses/>.

use Modern::Perl;

use C4::Installer::PerlDependencies;

# These are packages that may not be in the apt archive in a way that
# apt-file can find, e.g. in the Koha repo rather than the regular
# debian one.
my %overrides = (
    'LWP::Protocol::https' => 'liblwp-protocol-https-perl|libwww-perl (<<6.02), libio-socket-ssl-perl',
    'HTTP::OAI'            => 'libhttp-oai-perl (>= 3.2) | libhttp-oai-3.27-perl, libhttp-oai-perl (<< 4.0) | libhttp-oai-3.27-perl',
    'IO::Socket::IP'       => 'perl-modules (>= 5.20.0) | perl-modules-5.22 | perl-modules-5.24 | libio-socket-ip-perl',
    'Swagger2'             => 'libswagger2-perl (>= 0.59)',
    'Mojolicious'          => 'libmojolicious-perl (>= 6.0)',
);

# These are packages we're going to ignore
my %ignore = (
    'Data::Pagination'       => 1,
    'CHI'                    => 1,
    'CHI::Driver::Memcached' => 1,
);

my $deps = $C4::Installer::PerlDependencies::PERL_DEPS;

my $prefix = "^/usr/((lib|share)/perl5|(lib|share)/perl/[0-9.]+|(lib|share)/.*-linux-gnu.*/perl/[0-9.]+|(lib|share)/.*-linux-gnu.*/perl5/[0-9.]+)";

foreach my $module ( keys %$deps ) {
    next if $ignore{$module};
    my $ver     = $deps->{$module}->{'min_ver'};
    my $subpath = $module;
    $subpath =~ s,::,/,g;
    my $output = qx(apt-file -l -x search "$prefix/$subpath.pm\$");
    my @temp   = split( /\n/, $output );
    my @lines  = ();

    # Remove packages that are required/essential and always installed on
    # a Debian system. Debian packages should not have unversioned
    # dependencies on such packages.
    foreach my $line (@temp) {
        if ( $line ne "perl-base" ) {
            @lines = ( @lines, $line );
        }
    }
    if ( exists $overrides{$module} ) {
        print "$overrides{$module}\n";
    }
    elsif ( scalar(@lines) == 1 && $lines[0] ne "" ) {
        my $pkg = $lines[0];
        print "$pkg\n";
    }
    elsif ( scalar(@lines) > 1 ) {
        foreach my $pkg (@lines) {
            print " | " if ( $pkg ne $lines[0] );
            print "$pkg";
            print " | $pkg" . "-5.22" if ( $pkg eq "perl-modules" );
            print " | $pkg" . "-5.24" if ( $pkg eq "perl-modules" );
        }
        print "\n";
    }
    elsif ( scalar(@temp) != 0 ) {

        # I'm an Essential and I'm OK,
        # I install all night, and work all day.
        # I chomp up strings. I eat my bugs.
        # I go to the base install.
        # On Fridays I go drinking,
        # and have buttered commits for git.
        # (Beer O'Clock is more than two hours
        # away. I don't even drink beer. There
        # is no reason to be suspicious of this
        # commit.)
        # RM note: suspicious?  me?  always!
    }
    elsif ( ! $deps->{$module}->{'required'} ) {
        # Ignore because we don't have it and we don't care.
    }
    else {
        print "EEEK: unknown package for $module\n";
    }
}