package Gears::Context;

use strict;
use warnings;

use Gears::Util;
use Gears::Context::Template::XV6;
use Carp qw/croak/;

sub new {
  my ($class, %args) = @_;
  my $self = {
    data_gears_with_count => {},
    find_root => $args{find_root} // ".",
    output   => $args{output},
  };

  if ($args{compile_sources}) {
    $self->{compile_sources} = $args{compile_sources};
    map { Gears::Util->file_checking($_); } @{$self->{compile_sources}};
  }

  return bless $self, $class;
}


sub extraction_dg_compile_sources {
  my ($self, $compile_sources) = @_;
  return Gears::Util->extraction_dg_compile_sources($compile_sources);
}

sub set_data_gear_header_path {
  my $self = shift;
  my @data_gears_name;
  map { push (@data_gears_name,$_) if $_ ne "Context" } @_;
  return _find_headers($self->{find_root},\@data_gears_name);
}

sub update_dg_each_header_path {
  my ($self, $dgs, $dg2path) = @_;
  my $new_dgs;
  for my $kind (keys %$dgs) {
    for my $dg_name (keys %{$dgs->{$kind}}) {
      if ($dg2path->{$dg_name}) {
        $new_dgs->{$kind}->{$dg_name} = $dg2path->{$dg_name};
      } else {
        croak "failed trans header $dg_name\n";
      }
    }
  }
  return $new_dgs;
}

sub tree2create_context_h {
  my ($self, $dg2path) = @_;

  my $data_struct_str = $dg2path ? $self->tree2data_struct_str($dg2path) : "\n";

  my $output = $self->_select_output();
  Gears::Context::Template::XV6->emit_top_header($output);
  Gears::Context::Template::XV6->emit_data_gears($output,$data_struct_str);
  Gears::Context::Template::XV6->emit_last_header($output);
  close $output;
}

sub _select_output {
  my $self = shift;
  print "$self->{output}\n";
  if ($self->{output} eq  'stdout') {
    return *STDOUT;
  }
  open my $fh, '>', $self->{output};
  return $fh;
}

sub tree2data_struct_str {
  my ($self, $dg_str) = @_;
  my $data_struct_str  = "";
  for my $interface (sort keys %$dg_str) {
    $data_struct_str .= Gears::Util->h2context_str($dg_str->{$interface}->{elem});
    next unless ($dg_str->{$interface}->{impl});
    for my $impl (sort keys %{$dg_str->{$interface}->{impl}}) {
       $data_struct_str .= Gears::Util->h2context_str($dg_str->{$interface}->{impl}->{$impl});
    }
  }
  return $data_struct_str;
}

sub createImplTree_from_header {
  my ($self, $dg2path) = @_;
  my %dg_str = ();

  my $inters = $dg2path->{interfaces};
  my $impls = $dg2path->{impl};

  use Data::Dumper;
  print Dumper $dg2path;
  print Dumper  $self;

  map { $dg_str{$_}->{elem} = Gears::Util->parse_interface($inters->{$_}) } keys %$inters;

  map {
    my $res = Gears::Util->parse($impls->{$_});
    if ($res->{isa}) {
        $dg_str{$res->{isa}}->{impl}->{$_} = $res;
    } else {
        $dg_str{$_}->{elem} = $res;
    }
  } keys %$impls;
  return \%dg_str;
}

sub _find_headers {
  my ($search_bash_path, $targets) = @_;
  my %res;
  map { $res{$_}++ } @$targets;

  my $header_paths = Gears::Util->find_headers_path($search_bash_path);
  map {
    if (/(\w+)\.(?:h|dg)$/) {
        my $header_file = $1;
        if (exists $res{$header_file}) {
          if ($res{$header_file} =~ /^\d+$/){
            $res{$header_file} = $_;
          } elsif (($_ =~ /\.dg$/) && ($res{$header_file} =~ /\.h$/)) {
            $res{$header_file} = $_;
          }
        }
    }
  } sort @$header_paths;
  return \%res;
}


1;