#!/usr/bin/env perl

use strict;
use warnings;

my $kconfig_src_file = shift;
my $kconfig_obj_file = shift;

my %pfs;
my %archs;
my %files;

my $tag = qr {^\s*\#\s*};

foreach my $f (@ARGV) {
  my $bsp_name;
  $bsp_name = $1 if $f =~ /\/bsp\/([^\/]+)\//;
  open(X, $f) || die "Cannot open $f: $!";
  my $pf;
  my $arch;
  my $arch_cpu;
  my $current_snippet = [];
  my $fi = { sections => { GLOBAL => $current_snippet } };
  $files{$f} = $fi;

  while ($_=<X>) {
    if (/$tag PF:\s*(\S+)/x) {
      $pf = { name => $bsp_name, file => $f };
      push (@{$fi->{cond}}, "PF_$1");
      $pfs{$1} = $pf;
    }
    if (/$tag SECTION:\s*(\S+)/x) {
      $fi->{sections}{$1} = [] if not defined $fi->{sections}{$1};
      $current_snippet = $fi->{sections}{$1};
    }
    if  (defined $pf) {
      $pf->{desc}  = $1                        if /$tag PFDESCR:\s*(.+)/x;
      push(@{$pf->{select}}, split(/\s+/, $1)) if /$tag PFSELECT:\s*(.+)/x;
      push(@{$pf->{dep}}, $1)                  if /$tag PFDEPENDS:\s*(.+)/x;
    }

    if (/^$tag ARCH:\s*(\S+)\s+(\S+)/x) {
      $arch_cpu = undef;
      $arch = { name => $2, file => $f };
      $archs{$1} = $arch;
      $fi->{sections}{TARGET} = [] if not defined $fi->{sections}{TARGET};
      $current_snippet = $fi->{sections}{TARGET};
      push (@{$fi->{cond}}, $1);
    }
    if (defined $arch) {
      $arch->{desc} = $1            if /$tag ARCHDESCR:\s*(.+)/x;
      $arch->{default_cpu} = $1     if /$tag ARCHDEFAULTCPU:\s*(.+)/x;
      $arch->{default_pf} = $1      if /$tag ARCHDEFAULTPF:\s*(.+)/x;
      push (@{$arch->{select}}, $1) if /$tag ARCHSELECT:\s*(.+)/x;
      push (@{$arch->{dep}}, $1)    if /$tag ARCHDEPENDS:\s*(.+)/x;
      push (@{$arch->{help}}, $1)   if /$tag ARCHHELP:\s*(.+)/x;
      if (/$tag ARCHCPU:\s*(\S+)\s+(.+)/x) {
        $arch_cpu = { name => $1, desc => $2 };
        push (@{$arch->{cpus}}, $arch_cpu);
      }
    }
    if (defined $arch_cpu) {
      push (@{$arch_cpu->{dep}}, $1)    if /$tag ARCHCPUDEPENDS:\s*(.+)/x;
      push (@{$arch_cpu->{select}}, $1) if /$tag ARCHCPUSELECT:\s*(.+)/x;
      push (@{$arch_cpu->{help}}, $1)   if /$tag ARCHCPUHELP:\s*(.+)/x;
    }

    push (@{$current_snippet}, $_);
  }

  close X;
}
open(IN, "$kconfig_src_file") || die "Cannot open $kconfig_src_file: $!";
open(OUT, ">$kconfig_obj_file") || die "Cannot open $kconfig_obj_file: $!";
while ($_=<IN>) {
  print OUT;
  if (/$tag ARCH_DEFAULT_CPU\W/x) {
    foreach my $i (sort keys %archs) {
      print OUT "\tdefault $archs{$i}{default_cpu}  if $i\n"
        if defined $archs{$i}{default_cpu};
    }
  }
  if (/$tag ARCH_DEFAULT_PF\W/x) {
    foreach my $i (sort keys %archs) {
      print OUT "\tdefault $archs{$i}{default_pf}  if $i\n"
        if defined $archs{$i}{default_pf};
    }
  }
  if (/$tag ARCH_NAME\W/x) {
    foreach my $i (sort keys %archs) {
      print OUT "\tdefault \"$archs{$i}{name}\"  if $i\n"
        if defined $archs{$i}{name};
    }
  }
  if (/$tag ARCH_CHOICE\W/x) {
    foreach my $i (sort keys %archs) {
      next unless defined $archs{$i}{desc};
      print OUT "config $i\n";
      print OUT "\tbool \"$archs{$i}{desc}\"\n";
      print OUT "\tdepends on $_\n" foreach (@{$archs{$i}{dep}});
      print OUT "\tselect $_\n" foreach (@{$archs{$i}{select}});
      if (defined $archs{$i}{help}) {
        print OUT "\thelp\n";
        print OUT "\t\t$_\n" foreach (@{$archs{$i}{help}});
      }
      print OUT "\n";
    }
  }
  if (/$tag ARCH_CPU\W/x) {
    foreach my $i (sort keys %archs) {
      foreach my $c (@{$archs{$i}{cpus}}) {
        print OUT "config $c->{name}\n";
        print OUT "\tbool \"$c->{desc}\"\n";
        print OUT "\tdepends on $i\n";
        print OUT "\tdepends on $_\n" foreach (@{$c->{dep}});
        print OUT "\tselect $_\n" foreach (@{$c->{select}});
        next unless $c->{help};
        print OUT "\thelp\n";
        print OUT "\t\t$_\n" foreach (@{$c->{help}});
        print OUT "\n";
      }
    }
  }

  if (/$tag PF_SECTION:\s+(\S+)\W/x) {
    my $sect = $1;
    foreach my $i (sort keys %files) {
      next unless defined $files{$i}{sections}{$sect};
      print OUT "if " . join(" || ", @{$files{$i}{cond}})."\n";
      print OUT "\t$_" foreach (@{$files{$i}{sections}{$sect}});
      print OUT "endif\n";
    }
  }
  if (/$tag PF_INCLUDE\W/x) {
    print OUT "config BSP_NAME\n";
    print OUT "\tstring\n";
    foreach my $i (sort keys %pfs) {
      if (defined $pfs{$i}{name}) {
	print OUT "	default \"$pfs{$i}{name}\" if PF_$i\n";
      }
    }
    print OUT "\n";
  }
  if (/$tag PF_CHOICE\W/x) {
    foreach my $i (sort keys %pfs) {
      $pfs{$i}{desc} = "$i Platform" unless defined $pfs{$i}{desc};
    }

    foreach my $i (sort { $pfs{$a}{desc} cmp $pfs{$b}{desc} } keys %pfs) {
      print OUT "config PF_$i\n";
      print OUT "	bool \"$pfs{$i}{desc}\"\n";
      print OUT "	depends on $_\n" foreach (@{$pfs{$i}{dep}});
      print OUT "	select $_\n" foreach (@{$pfs{$i}{select}});
      print OUT "\n";
    }
  }
}
close IN;
close OUT;