#!/usr/bin/perl

use strict;
use warnings;

eval {
    require Module::Build;
} or do {
    die "error: Missing Module::Build module, cannot proceed.\n";
};

if (-e 'Build.PL.in') {
    die "error: This is an in-tree build, not a proper perl distribution.\n" .
        "To create one please configure normally and then run 'make dist'.\n";
}

my $class = Module::Build->subclass(
    class => 'Module::Build::Dpkg',
    code => q{
        require Config;
        require IPC::Cmd;

        sub find_command {
            my (@alts) = @_;

            foreach my $cmd (@alts) {
                my $pathname = IPC::Cmd::can_run($cmd);
                return $pathname if defined $pathname;
            }
            die "error: cannot find any of @alts\n";
        }

        sub subst {
            my ($self, $file) = @_;
            my $path = $self->install_path();
            my $version = $self->dist_version();

            my $progmake = find_command(qw(gmake make));
            my $progpatch = find_command(qw(gpatch patch));
            my $progtar = find_command(qw(gtar tar));

            unlink "blib/$file"
                or die "error: cannot remove blib/$file: $!\n";
            open my $fhin, '<', $file
                or die "error: cannot open $file: $!\n";
            open my $fhout, '>', "blib/$file"
                or die "error: cannot create blib/$file: $!\n";
            while (<$fhin>) {
                s{our \$PROGVERSION = .*;}{our \$PROGVERSION = '$version';};
                s{our \$PROGMAKE = .*;}{our \$PROGMAKE = '$progmake';};
                s{our \$PROGPATCH = .*;}{our \$PROGPATCH = '$progpatch';};
                s{our \$PROGTAR = .*;}{our \$PROGTAR = '$progtar';};
                s{our \$CONFDIR = .*;}{our \$CONFDIR = '$path->{conf}';};
                s{our \$DATADIR = .*;}{our \$DATADIR = '$path->{data}';};
                s{our \$ADMINDIR = .*;}{our \$ADMINDIR = '$path->{admin}';};
                s{our \$LIBDIR = .*;}{our \$LIBDIR = '$path->{libexec}';};
                print { $fhout } $_;
            }
            close $fhout or die "error: cannot write blib/$file: $!\n";
            close $fhin;
        }

        sub ACTION_build {
            my $self = shift;

            $self->SUPER::ACTION_build;
            $self->subst('lib/Dpkg.pm');
        }
        sub ACTION_test {
            my $self = shift;

            local $ENV{LANG} = 'C';
            local $ENV{LC_ALL} = 'C';
            local $ENV{PERL} = $Config::Config{perlpath} || $^X || 'perl';
            local $ENV{DPKG_TEST_MODE} = 'cpan';
            local $ENV{DPKG_DATADIR} = 'data';
            local $ENV{DPKG_ORIGINS_DIR} = 't/origins';
            # To avoid requiring dpkg(1).
            local $ENV{DEB_BUILD_ARCH} = 'amd64';
            $self->SUPER::ACTION_test;
        }
    },
);

my $build = $class->new(
    dist_name       => '@PACKAGE_CPAN_NAME@',
    dist_abstract   => 'Debian Package Manager Perl modules',
    dist_version    => '@PACKAGE_VERSION@',
    dist_author     => '@PACKAGE_COPYRIGHT_HOLDER@ <@PACKAGE_BUGREPORT@>',
    license         => 'GPL_2',

    release_status  => @PACKAGE_DIST_IS_RELEASE@ ? 'stable' : 'testing',

    # Set only to avoid warnings.
    module_name     => '@PACKAGE_CPAN_NAME@',

    meta_merge => {
        'meta-spec' => {
            version => 2,
        },
        prereqs => {
            configure => {
                recommends => {
                    'Module::Signature'     => 0,
                },
            },
            test => {
                recommends => {
                    'Test::Pod'             => 0,
                    'Test::Strict'          => 0,
                },
            },
            develop => {
                recommends => {
                    'Test::MinimumVersion'  => 0,
                    'Test::Perl::Critic'    => 0,
                    'Test::Pod::Coverage'   => 0,
                    'Test::Spelling'        => 0,
                    'Test::Synopsis'        => 0,
                },
            },
        },
        resources => {
            homepage => '@PACKAGE_URL@',
            repository => {
                type => '@PACKAGE_VCS_TYPE@',
                url => '@PACKAGE_VCS_URL@',
                web => '@PACKAGE_VCS_WEB@',
            },
            bugtracker => {
                web => '@PACKAGE_BUG_WEB@',
            },
        },
        keywords => [ qw(dpkg debian perl) ],
    },

    sign            => @PACKAGE_DIST_IS_RELEASE@,
    dynamic_config  => 0,

    configure_requires => {
        'Module::Build'         => '0.4004',
    },
    test_requires => {
        'TAP::Harness'          => 0,
        'Test::More'            => 0,
    },
    recommends => {
        'Algorithm::Merge'      => 0,
        'File::FcntlLock'       => 0,
        'Locale::gettext'       => 0,

    },
    requires => {
        'perl'                  => '@PERL_MIN_VERSION@',
    },

    data_files => {
        map { $_ => $_ } glob 'data/*'
    },
    install_path => {
        conf => '/etc/dpkg',
        data => '/usr/share/dpkg',
        admin => '/var/lib/dpkg',
        libexec => '/usr/lib/dpkg',
    },
);

$build->add_build_element('data');
$build->create_build_script();

1;