#!/usr/bin/perl

use strict;
use warnings;
use autodie qw(:all);;

use Capture::Tiny qw(capture_stdout);
use Path::Tiny;
use YAML::XS;
use Try::Tiny;

my $node = $ARGV[0];
my $outdir = path($ARGV[1]);

my $basedir = path('.');

my $skeldir = path( $basedir, 'skel' );
my $infile = path( $skeldir, 'preseed.cfg.in' );
my $altinfile = path( $skeldir, 'script.sh.in' );

my $data = Load( scalar( capture_stdout {
	system(qw( reclass -b profiles/wheezy --inventory ));
}));

my $outfile = path( $outdir, 'preseed.cfg' );
my $altoutfile = path( $outdir, 'script.sh' );

my %desc;
my %params = %{ $data->{'nodes'}{$node}{'parameters'} };

#FIXME: sort by explicit list
foreach my $key ( sort keys $params{doc} ) {
	my $headline = $params{doc}{$key}{headline}[0] || $key;
	if ( $params{pkg} and $params{doc}{$key}{pkg} ) {
		push @{ $desc{pkg} }, "# $headline";
		foreach ( @{ $params{doc}{$key}{pkg} } ) {
			push @{ $desc{pkg} }, "#  * $_";
		};
	};
	if ( $params{tweak} and $params{doc}{$key}{tweak} ) {
		push @{ $desc{tweak} }, "# $headline";
		foreach ( @{ $params{doc}{$key}{tweak} } ) {
			push @{ $desc{tweak} }, "#  * $_";
		};
	};
};
my $pkgdesc = defined( $desc{pkg} )
	? join( "\n", @{ $desc{pkg} } )
	: '';
my $tweakdesc = defined( $desc{tweak} )
	? join( "\n", @{ $desc{tweak} } )
	: '';
my @pkg = try { @{ $params{pkg} } }
	catch { die "No packages resolved" };
my @pkgauto = try { @{ $params{'pkg-auto'} } }
	catch { die "No package auto-markings resolved" };
my @pkgavoid = try { @{ $params{'pkg-avoid'} } }
	catch { die "No package avoidance resolved" };
my @tweak = try { @{ $params{tweak} } }
	catch { die "No tweaks resolved" };
my $pkglist = join( ' ', sort @pkg );
$pkglist .= " \\\n ";
$pkglist .= join( ' ', sort map { $_.'-' } @pkgavoid );
my $pkgautolist = join( ' ', sort @pkgauto );
grep {chomp} @tweak;
my $tweaklist = join( ";\\\n ", 'set -e', @tweak );

$outdir->mkpath;
$_ = $altinfile->slurp;
s,__PKGDESC__,$pkgdesc,;
s,__PKGLIST__,$pkglist,;
s,__TWEAKDESC__,$tweakdesc,;
s,__TWEAKLIST__,$tweaklist,;
s,__PKGAUTOLIST__,$pkgautolist,;
s,chroot\s+/target\s+,,g;
s,/target/,/,g;
$altoutfile->spew($_);
$_ = $infile->slurp;
s,__PKGDESC__,$pkgdesc,;
s,__PKGLIST__,$pkglist,;
s,__TWEAKDESC__,$tweakdesc,;
s,__TWEAKLIST__,$tweaklist,;
s,__PKGAUTOLIST__,$pkgautolist,;
$outfile->spew($_);

1;