#! /usr/bin/perl -w
#
# vim:sw=2:et
# 

BEGIN {
  unshift @INC, ".";
  unshift @INC, "/usr/lib/build/";
}

use Time::localtime;
use Data::Dumper;
use strict;

my @oldspec = ();
my @newspec = ();
my $base_package = "";
my $neededforbuild = "";
my $icecreamforbuild = "";
my $norootforbuild = 0;
my @copyrights = ();
my $needsrootforbuild = 0;
my $needsbinariesforbuild = 0;
my $nodebuginfo = 0;
my %multiline_macros = ();
my $nosrc_result = 0;
my $current_section = "header";
my $had_debug_package = 0;
my %pkg_version = ();
my %pkg_release = ();
my %please_replace = ();
my %replace_hash = ();
my $build_root = $ENV{'BUILD_ROOT'};
my $disabled_packs;
my $ifhandler;
my $definelist;
my $debug = 0;

my @global_tags_list = 
(
 'Autoreq',
 'Autoreqprov',
 'BuildArch',
 'BuildArchitectures',
 'BuildRequires',
 'Conflicts',
 'DocDir',
 'Enhances',
 'Enhances',
 'EssentialFor',
 'ExcludeArch',
 'ExclusiveArch',
 'Freshens',
 'NoPatch',
 'NoSource',
 'Obsoletes', 
 'Patch\d*',
 'Prefix',
 'PreReq',
 'Provides',
 'Recommends',
 'Requires',
 'Source\d*',
 'Suggests',
 'Supplements',
 'Url',
);

my $global_tags_re = '^\s*(' . join("|", @global_tags_list) . ')\s*:';

my $section_tags_re ='^\s*%(?:clean|check|prep|build|install|pre|post|preun|postun|posttrans|package|' .
                     'description|files|triggerin|triggerun|triggerpostun)\b';

sub unify {
  my %h = map {$_ => 1} @_;
  return grep(delete($h{$_}), @_);
}

sub capitalize_case($)
{
  my ($tag) = @_;

  $tag = lc($tag);

  $tag =~ s/docdir/DocDir/i;
  $tag =~ s/arch/Arch/i;
  $tag =~ s/patch/Patch/i;
  $tag =~ s/source/Source/i;
  $tag =~ s/req/Req/i;
  $tag =~ s/prov/Prov/i;
  $tag =~ s/^(\w)/uc($1)/e;

  return $tag;
}

sub maybe_add_empty_line()
{
  push @oldspec, "XXXBLANKLINE" 
    if ($current_section ne "description" && $oldspec[-1] !~ /^\s*$/);
}

sub change_section($)
{
  my ($new_section) = @_;

  maybe_add_empty_line();

  $current_section = $new_section;
  warn "section changed to $current_section\n" if $debug;
}

sub set_current_pkg {
  my ( $arg ) = @_;
  print "DEBUG: set_current_pkg receiving $arg\n" if $debug;
  my ( @argarray ) = split ( '\s+' , $arg );
  my $curpack = $base_package;
  my $curlang = "";
  while (my $carg = shift @argarray) {
    next if ($carg eq "%description" || $carg eq "%package" || $carg eq "%prep");
    if ($carg eq "-l") {
      $curlang = shift @argarray;
    } elsif ($carg eq "-n") {
      $curpack = shift @argarray;
    } else {
      $curpack = "$base_package-" if $base_package;
      $curpack .= $carg;
    }
  }
  print "DEBUG: set_current_pkg returning $curpack, $curlang\n" if $debug;
  return ($curpack, $curlang);
}

sub read_and_parse_old_spec {
  my ( $specfile, $base_package ) = @_;
  my $current_package = $base_package;
  my $current_lang = "";
  my $check_printed = "false";
  my $print_comments = "false";
  my %version;
  my $ifhandler;
  $ifhandler->{"disabled"} = 0;

  my @readspec;
  open ( SPEC , "$specfile" ) || die "can't read specfile";
  @readspec = <SPEC>;
  close SPEC;
  chomp @readspec;

  while (@readspec) {
    $_ = shift @readspec;
    if ( /^\s*$/ && $current_section ne "description") {
	push @oldspec, "XXXBLANKLINE";
	next;
    }
    
    if ( /^#\s*norootforbuild\s*$/ ) {
        $norootforbuild = 1;
        next;
    }
    if ( /^#\s*needsrootforbuild\s*$/ ) {
        $needsrootforbuild = 1;
        next;
    }
    if ( /^#\s*needsbinariesforbuild\s*$/ ) {
        $needsbinariesforbuild = 1;
        next;
    }
    if ( /^#\s*nodebuginfo\s*$/ ) {
        $nodebuginfo = 1;
        next;
    }
    if ( /^#\s*icecream/ ) {
        $icecreamforbuild = $_;
	$icecreamforbuild =~ s/^#\s*icecream\s*//;
        next;
    }
    if ( /^#\s*Copyright\s*/ ) {
        for (;;)
          {
            # check if line is ONLY a standard copyright line, if so, ignore.
            my $c = $_;
            $c =~ s{\s*(\d+|copyrights?|\(c\)|suse|linux|products|gmbh|nuremberg|n..?rnberg|germany|\W+)\s*}{}gi;
            push(@copyrights, $_) if length $c > 5;
            last if length $readspec[0] < 10 || $readspec[0] =~ m{modifications and additions}i || $readspec[0] !~ /^[\#\s]/
		|| grep { $readspec[0] =~ /^#\s*$_/ } ("norootforbuild","needsrootforbuild","needsbinariesforbuild","nodebuginfo","icecream","neededforbuild","usedforbuild","Commandline","MD5SUM","!BuildIgnore");
            $_ = shift @readspec;
          }
        next;
    }
    if ( /^#\s*neededforbuild/ ) {
	$neededforbuild = $_;
	$neededforbuild =~ s/^#\s*neededforbuild\s*//;
        my (%aa) = ();
	foreach my $x (split(' ',$neededforbuild)){
	  $aa{$x}=1;
	}
        $neededforbuild = join(' ',sort keys (%aa));

      next;
    }
    # evil epoch removal
    next if ( /^Epoch:/ );
    $_ =~ s/%{?epoch}?[:-]//g;
    $_ =~ s/ 0:/ /g if ( /^requires/i || /^buildreq/i );

    if ( /^BuildRequires:/ ) {
	my $cur_buildreq = $_;
	$cur_buildreq =~ s/^BuildRequires:\s*//;
	my %aa;
	while ($cur_buildreq =~ m{([^,\s]+(\s*[<=>]+\s*[^,\s]+)?)}g) {
	  $aa{$1}=1;
	}
	# ignore line if it looks like a "usedforbuild" line, i.e.
	# if it contains too many base packages
	next if (grep {$aa{$_}} qw{gcc rpm glibc bash}) > 2;
	push @oldspec, "BuildRequires:  ".join(' ',sort keys(%aa));
	next;
    }
    next if ( /^#\s*usedforbuild/ );
    if ( /^%\?__\*BuildRequires:/ ) {
      push @oldspec, $_;
      next;
    }
    if ( /^#!__\*BuildRequires:/ ) {
      push @oldspec, $_;
      next;
    }
    if ( /^#!BuildIgnore:/ ) {
      push @oldspec, $_;
      next;
    }
    if ( /^#/ && $current_section ne "description") {
      warn "$_ $current_section\n" if $debug;
      if ( $print_comments eq "true" || $readspec[0] =~ /^%define/ || $readspec[0] =~ /^%if/) {
        push @oldspec, $_;
      }
      next;
    }
    if ( /^%debug_package/ ) {
	# remove, we add this ourselves
	next;
    }
    $print_comments = "true" unless /^#/;

    if ( /^%define\s*vendor\s/ || /^%define\s*distribution\s/ ) {
      next;
    }
    if ( /^%define\s+(\w[\w\d]+).*\\$/ ) {
      $multiline_macros{$1} = 1;
    }
    if ( /^\s*%if/ || /^\s*%\{/ || /^\s*%define/ || /^\s*%el/ || /^\s*%endif/ ) {
      change_section("header") if ($current_section eq "description");
      push @oldspec, $_;
      if ( /^\s*%if\s/ ) {
	my @args = split (/\s+/,$_);
	$_ =~ s/[\{\}\"]//g for (@args);
	$ifhandler->{"last_if_disabled"} = 0;
	$ifhandler->{"last_if_if"} = 1;
	$ifhandler->{"depth"}++;
	my $if_not = 0;
	if ( $args[1] =~ /^\!/ ) {
		$args[1] =~ s/^\!//;
		$if_not = 1;
	}
	$args[2] = "" unless $args[2];
	if (	($args[1] eq "0")
		|| ($args[1] eq "%name" && $args[2] eq "!=" && $args[3] eq $base_package)
		|| ($args[1] eq "%name" && $args[2] eq "==" && $args[3] ne $base_package)
		|| ($args[1] && !$args[3] && !$if_not && $definelist->{$args[1]} && $definelist->{$args[1]} eq "0")
		|| ($args[2] eq "==" && $args[3] ne "0" && $definelist->{$args[1]} && $definelist->{$args[1]} eq "0")
		|| ($args[2] eq "!=" && $args[3] eq "0" && $definelist->{$args[1]} && $definelist->{$args[1]} eq "0")
		|| ($args[1] && !$args[3] && $if_not && $definelist->{$args[1]} && $definelist->{$args[1]} eq "1")
		|| ($args[1] && $args[2] eq "!=" && $args[3] eq "1" && $definelist->{$args[1]} && $definelist->{$args[1]} eq "1") ) {
		$ifhandler->{"disabled"} = $ifhandler->{"depth"};
		$ifhandler->{"last_if_disabled"} = 1;
	}
      } elsif ( /^\s*%if/ ) {
	$ifhandler->{"last_if_disabled"} = 0;
        $ifhandler->{"last_if_if"} = 0;
	$ifhandler->{"depth"}++;
      } elsif ( /^\s*%endif/ ) {
	$ifhandler->{"disabled"} = 0 if $ifhandler->{"disabled"} == $ifhandler->{"depth"};
	$ifhandler->{"depth"}--;
      } elsif ( /^\s*%else/ ) {
	if ($ifhandler->{"disabled"} == $ifhandler->{"depth"} && $ifhandler->{"last_if_disabled"} == 1) {
		$ifhandler->{"disabled"} = 0;
	} elsif ($ifhandler->{"disabled"} == 0 && $ifhandler->{"depth"} == 1 && $ifhandler->{"last_if_if"} == 1) {
		$ifhandler->{"disabled"} = 1;
	}
      } elsif ( /^\s*%define\s/ ) {
	my @args = split (/\s+/,$_);
	$_ =~ s/[\{\}\"]//g for (@args);
	$args[2] =~ s/\Q$_\E/$definelist->{$_}/g for sort { length($b) <=> length($a) } keys (%{$definelist});
	if ( $args[2] !~ /[\(\)\{\}\@\%\"\\]/ ) {
		$definelist->{"%".$args[1]} = $args[2] if $ifhandler->{"disabled"} == 0;
		$definelist->{"%{".$args[1]."}"} = $args[2] if $ifhandler->{"disabled"} == 0;
		$definelist->{"%{?".$args[1]."}"} = $args[2] if $ifhandler->{"disabled"} == 0;
	}
	while ($_ =~ /\\$/) {
	  $_ = shift @readspec;
	  push @oldspec, $_;
	}
      }
      next;
    }
    if ( /^%package\b/i or /^%prep\b/i ) {
      if (/^%package\b/i) {
	change_section("header");
      } else {
	change_section("prep");
      }
      $_ =~ s/^(%\w+)/lc($1)/e;
      if ($debug) {
    	warn "key: $_ value: $definelist->{$_}\n" for (sort { length($b) <=> length($a) } keys (%{$definelist}));
      }
      push @oldspec, $_;
      for my $xx (sort { length($b) <=> length($a) } keys (%{$definelist})) {
        $_ =~ s/\Q$xx\E/$definelist->{$xx}/;
      }
      $_ =~ s/%{\?[^\}]*}//;
      if ($debug) {
	warn "after: $_\n";
      }
      ($current_package, $current_lang) = set_current_pkg ( $_ );
      if ($ifhandler->{"disabled"}) {
	$disabled_packs->{$current_package} = 1;
	warn "$current_package is disabled\n" if $debug;
      }
      next;
    }
    if ( /^%description\b/i ) {
      change_section("description");
      $_ =~ s/^(%\w+)/lc($1)/e;
      push @oldspec, $_;
      ($current_package, $current_lang) = set_current_pkg ( $_ );
      my $target = $current_package;
      $target .= "_$current_lang" if $current_lang;
      $target .= "_disabled" if $ifhandler->{"disabled"};
      push @oldspec, "XXXDESCRIPTION $target";
      next;
    }
    if ( /^%install\b/i ) {
      change_section("install");
      push @oldspec, $_;
      next;
    }
    if ( /^%changelog\b/i ) {
      change_section("changelog");
      # changelog comes always from *.changes.  Skip what is in spec file
      # at the moment.
      next;
    }
    if (/^%files\b/i) {
      change_section("files");
      $current_section = "files";
    }
    if ( /^%/ ) {
      if ( m/$section_tags_re/oi ) {
        $_ =~ s/^(%\w+)/lc($1)/e;
        change_section("header") if (! m/\s*%files/i && !m/\s*%build/i);
	change_section("build") if m/\s*%build/i;
	warn "changed to $current_section for $_\n" if $debug;
      }

      push @oldspec, "$_";
      # multiline macros need an extra newline with old RPMs
      if (/^%(\w[\w\d]+).*[^\\]$/) {
        push @oldspec, "" if (defined($multiline_macros{$1}));
      }
      next;
    }
    if ($current_section eq "header") {
      my $c_pack = $current_package;
      $c_pack .= "_disabled" if $ifhandler->{"disabled"};
      if ( /^Summary\b\s*:\s*(.*)/i ) {
        $replace_hash{"XXXSUMMARY $c_pack"} = sprintf("%-16s%s","Summary:", $1);
        push @oldspec, "XXXSUMMARY $c_pack";
        next;
      }
      if ( /^Group\b\s*:\s*(.*)/i ) {
        $replace_hash{"XXXGROUP $c_pack"} = sprintf("%-16s%s", "Group:", $1);
        push @oldspec, "XXXGROUP $c_pack";
        next;
      }
      if ( /^Vendor:/ || /^Distribution:/ || /^Packager:/ ) {
        next;
      }
      if ( /^Name\s*:\s*(.*)/i ) {
	my $orig_name = $1;
        my $changed_name = $orig_name;
        $changed_name =~ s/\Q$_\E/$definelist->{$_}/ for (sort { length($b) <=> length($a) } keys (%{$definelist}));
        if ($changed_name eq $base_package) {
          push @oldspec, sprintf("\n%-16s%s","Name:", $orig_name);
	} else {
          push @oldspec, sprintf("\n%-16s%s","Name:", $base_package);
	}
	$definelist->{"%name"} = $base_package if $ifhandler->{"disabled"} == 0;
	$definelist->{"%{name}"} = $base_package if $ifhandler->{"disabled"} == 0;
	warn ("line is $_, orig_name is $orig_name, base_package is $base_package\n") if $ifhandler->{"disabled"} == 0 && $debug;
        next;
      }
      if ( /^BuildArchitectures\s*:/i ) {
        $_ =~ s/^[^:]+:/BuildArch:/;
      }
      if ( /^Release\s*:\s*(.*)/i ) {
        $pkg_release{$c_pack} = $_;
        $replace_hash{"XXXRELEASE $c_pack"} = sprintf("%-16s%s","Release:", $1);
        next;
      }
      if ( /^BuildRoot\s*:/i ) {
        push @oldspec, "BuildRoot:      %{_tmppath}/%{name}-%{version}-build";
        next;
      }
      if ( /^Copyright\s*:\s*(.*)/i || /^License\s*:\s*(.*)/i ) {
        $replace_hash{"XXXLICENSE $c_pack"} = sprintf("%-16s%s","License:", $1);
        push @oldspec, "XXXLICENSE $c_pack";
        next;
      }
      if ( /^Url\s*:\s*(.*)/i ) {
        $replace_hash{"XXXURL $c_pack"} = sprintf("%-16s%s","Url:", $1);
        push @oldspec, "XXXURL $c_pack";
        next;
      }
      if ( m/$global_tags_re\s*(.*)/oi ) {
        my ($tag, $value) = ($1, $2);
        $nosrc_result = 1 if ($tag =~ /(?:nosource|nopatch)/i);
        push @oldspec, sprintf("%-16s%s", capitalize_case($tag) . ":", $value);
        next;
      }
      if ( /^Version:/ ) {
	warn "found Version, section = $current_section\n" if $debug;
        $version{$c_pack} = $_;
        $version{$c_pack} =~ s/^Version:\s*(.*)\s*/$1/;
        $replace_hash{"XXXVERSION $c_pack"} = sprintf("%-16s%s","Version:",$version{$c_pack});
        push @oldspec, $replace_hash{"XXXVERSION $c_pack"};
        push @oldspec, "XXXRELEASE $c_pack";
        next;
      }
    }
    if ( $current_section eq "description" ) {
      my $target = $current_package;
      $target .= "_$current_lang" if $current_lang;
      $target .= "_disabled" if $ifhandler->{"disabled"};
      $replace_hash{"XXXDESCRIPTION $target"} .= "\n" if ( $replace_hash{"XXXDESCRIPTION $target"} );
      $replace_hash{"XXXDESCRIPTION $target"} .= $_;
      next;
    }
    if ( $current_section ne "description" && $current_section ne "changelog" ) {
      push @oldspec, $_;
    }
  }
}

if ($ARGV[0] eq '--debug') {
  $debug = 1;
  shift @ARGV;
}

my $specfile = shift ( @ARGV );
if ( ! stat($specfile) ) {
  die "$specfile is no file";
}


my @specpath = split ('/' ,$specfile);
my $specbase = pop @specpath;
my $specdir = join ('/', @specpath);

if ( $specdir eq "" ) {
  $specdir = ".";
}

my $xdefinelist;
my $seen_name = 0;
open ( SPE , "$specfile" );
while ( <SPE> ) {
  chomp();
  if ( /^%define/ ) {
    my @args = split (/\s+/,$_);
    $_ =~ s/[\{\}\"]//g for (@args);
    $args[2] =~ s/\Q$_\E/$xdefinelist->{$_}/ for (sort { length($b) <=> length($a) } keys (%{$xdefinelist}));
    if ( $args[2] !~ /[\(\)\{\}\@\%\"\\]/ ) {
      $xdefinelist->{"%".$args[1]} = $args[2];
      $xdefinelist->{"%{".$args[1]."}"} = $args[2];
    }
  }
  if ( /^\s*Name:/ ) {
    next if $seen_name;
    $seen_name = 1;
    $base_package = $_;
    $base_package =~ s/^\s*Name:\s*(\S*)\s*/$1/;
    $base_package =~ s/\Q$_\E/$xdefinelist->{$_}/ for (sort { length($b) <=> length($a) } keys (%{$xdefinelist}));
    if ($debug) {
	warn "DEBUG: base_package = $base_package\n";
	warn Dumper($xdefinelist);
    }
    last;
  }
}
close ( SPE );

warn ("base_package is $base_package\n") if $debug;

if ( ! stat ((glob("$specdir/$base_package*.spec"))[0] || "") ) {
  $base_package =~ s/[0-9]$//;
}
if ( ! stat ((glob("$specdir/$base_package*.spec"))[0] || "") ) {
  $base_package =~ s/\-[^\-]*$//;
}

warn ("base_package is $base_package\n") if $debug;

if ( ! stat ((glob("$specdir/$base_package*.spec"))[0] || "") ) {
  $base_package = $specbase;
  $base_package =~ s/\.spec$//;
  $base_package =~ s/\-.*$//;
}

read_and_parse_old_spec ( $specfile, $base_package );

for (@oldspec) {
  next unless /^XXX/;
  $please_replace{$_} = 1;
}

my $thisyear = localtime->year() + 1900;

unshift @copyrights, "# Copyright (c) $thisyear SUSE LINUX Products GmbH, Nuernberg, Germany.";

my $copy_list = join("\n", @copyrights);
print <<EOF;
#
# spec file for package $base_package
#
$copy_list
#
# All modifications and additions to the file contributed by third parties
# remain the property of their copyright owners, unless otherwise agreed
# upon. The license for this file, and modifications and additions to the
# file, is the same license as for the pristine package itself (unless the
# license for the pristine package is not an Open Source License, in which
# case the license is the MIT License). An "Open Source License" is a
# license that conforms to the Open Source Definition (Version 1.9)
# published by the Open Source Initiative.

# Please submit bugfixes or comments via http://bugs.opensuse.org/
#

EOF

print "# norootforbuild\n" if $norootforbuild;
print "# needsrootforbuild\n" if $needsrootforbuild;
print "# needsbinariesforbuild\n" if $needsbinariesforbuild;
print "# nodebuginfo\n" if $nodebuginfo;
print "# icecream $icecreamforbuild\n" if $icecreamforbuild ne '';
print "\n";

while ($oldspec[0] eq "XXXBLANKLINE") {
  shift @oldspec;
}

my $line;
while (@oldspec) {
  $line = shift @oldspec;
  if ($line eq "XXXBLANKLINE") {
    print "\n" unless $oldspec[0] && ($oldspec[0] eq "XXXBLANKLINE" || $oldspec[0] =~ /^\s*$/ || $oldspec[0] =~ /^\n/);
  } elsif ($line =~ /^XXX/) {
    print "DEBUG: replacing $line\n" if $debug;
    print "$replace_hash{$line}\n";
  } else {
    print "$line\n";
    # a package line with no license tag found for it yet
    # if line ends with "\", we are probably in a macro definition
    if ($line =~ /^%package/ && $line !~ /\\$/) {
	$line =~ s/^(%\w+)/lc($1)/e;
	my ($current_package, $current_lang) = set_current_pkg ( $line );
	unless ($please_replace{"XXXLICENSE $current_package"} || !$replace_hash{"XXXLICENSE $current_package"}) {
		print $replace_hash{"XXXLICENSE $current_package"}."\n";
	}
    }
  }
}

print "\n" unless $line eq "XXXBLANKLINE";
print "%changelog\n";