#!/usr/bin/perl -w
undef $/;
my $DEB_HOST_MULTIARCH = (split /\n/, qx/dpkg-architecture -qDEB_HOST_MULTIARCH/)[0];
my $DEB_HOST_ARCH = (split /\n/, qx/dpkg-architecture -qDEB_HOST_ARCH/)[0];
my $DEB_HOST_ARCH_BITS = (split /\n/, qx/dpkg-architecture -qDEB_HOST_ARCH_BITS/)[0];

sub file_replace
{
    my ($f,$name,$lcname)= @_;
    my $foutname = $f;
    $foutname =~ s/[@]NAME[@]/$name/;
    $foutname =~ s/[@]LCNAME[@]/$lcname/;
    open IN, "<debian/$f.in" or die "Can't read debian/$f.in: $!\n";
    local $_=<IN>;
    close IN;

    s/[@]NAME[@]/$name/g;
    s/[@]LCNAME[@]/$lcname/g;
    s/[@]DEB_HOST_MULTIARCH[@]/$DEB_HOST_MULTIARCH/g;
    open OUT, ">debian/$foutname"
	or die "Can't write debian/$foutname: $!\n";
    print OUT;
    close OUT;
}

my $control;

my $ctemplate;
my $cfilename = 'test-@NAME@.c';
open(my $fctemplate, '<', $cfilename) or die "cannot open file $cfilename";
{
    local $/ = undef;
    $ctemplate = <$fctemplate>;
}
close($fctemplate);

# dpkg-shlibdeps now looks inside, but is ok with an empty file.
system("touch debian/control");

my @control_in;
open IN, "<debian/control.d/control.in" or die "Can't read debian/control.d/control.in: $!\n";
$_=<IN>;
@control_in = grep !/^\s*$/s, split /\n\s*\n/s;
close IN;

open ISA_LIST, "<isa-list" or die "Can't read isa-list: $!\n";
$_=<ISA_LIST>;
close ISA_LIST;
my %archlist;

my @structs;
foreach my $block (split /\n\s*\n/s)
{
    my $lastfield = undef;
    my %data = ();
    foreach (split /\n/s, $block) {
	next if /^#.*/;
	next if /^\s*$/;
	if (/^([^\s:]+?)\s*:\s*(.*?)\s*$/) {
	    $key = $1;
	    $value = $2 // '';
	    $data{"$key"} = "$value";
	    $lastfield = "$key";
	} elsif (/^(\s\S.*?)\s*$/) {
	    $data{$lastfield}  .= "\n$1";
	}

	next;
    }
    push @structs, \%data if %data;

}

for (@structs) {
    my %entry = %$_;
    $archlist{$entry{'Architecture'}} = 1;
    my $name=$entry{'Name'};
    my $lcname=lc($name);
    $name=~/^[a-zA-Z0-9\.+_]+$/ or die "Bad package/isa name: \"$name\".\n";
    my $description=$entry{'Description'};
    $description=~s/\A\s*\n+//m;
    $description=~s/\A\s+//m;

    my @c = @control_in;
    foreach (@c) {
	s/[@]NAME[@]/$name/g;
	s/[@]LCNAME[@]/$lcname/g;
	s/[@]ARCHITECTURE[@]/$entry{'Architecture'}/g;
	s/[@]DEB_HOST_MULTIARCH[@]/$DEB_HOST_MULTIARCH/g;
	s/[@]DESCRIPTION[@]/$description/g;
	$control.="\n".$_;
    }

    open C, '>', "test-$name.c";
    my $test=$entry{'Test'}//"return !__builtin_cpu_supports(\"$lcname\");";
    my $cfile = $ctemplate;
    $cfile =~ s/[@]TEST[@]/$test/g;
    print C $cfile;
    close C;

    for my $qemu (qw(qemu-good qemu-bad)) {
	if (exists $entry{$qemu}) {
	    my $finname = $qemu.'-@NAME@';
	    my $foutname = $finname;
	    $foutname =~ s/[@]NAME[@]/$name/;
	    open IN, "<$finname" or die "Can't read $finname: $!\n";
	    local $_=<IN>;
	    close IN;

	    s/[@]NAME[@]/$name/g;
	    s/[@]DEB_HOST_MULTIARCH[@]/$DEB_HOST_MULTIARCH/g;
	    s/[@]DEB_HOST_ARCH[@]/$DEB_HOST_ARCH/g;
	    s/[@]DEB_HOST_ARCH_BITS[@]/$DEB_HOST_ARCH_BITS/g;
	    s/[@]QEMU_GOOD[@]/$entry{'qemu-good'}/g;
	    s/[@]QEMU_BAD[@]/$entry{'qemu-bad'}/g;

	    open OUT, ">$foutname"
		or die "Can't write $foutname: $!\n";
	    print OUT;
	    close OUT;
	}
    }

    foreach (qw(@LCNAME@-support.preinst @LCNAME@-support.templates @LCNAME@-support.lintian-overrides @LCNAME@-support.maintscript)) {
	file_replace($_,$name,$lcname);
    }
}

my $all_architectures = join(' ',sort(keys %archlist));

my $control_base;
my $filename = "debian/control.d/control-base.in";
open(my $fh, '<', $filename) or die "cannot open file $filename";
{
    local $/ = undef;
    $control_base = <$fh>;
}
close($fh);
$control_base =~ s/[@]ALL_ARCHITECTURES[@]/$all_architectures/g;
$control=$control_base.$control;

open CONTROL, ">debian/control" or die "Can't write to debian/control: $!\n";
print CONTROL $control;
close CONTROL;