package FFI::Build::MM;

use strict;
use warnings;
use 5.008004;
use Carp ();
use FFI::Build;
use JSON::PP ();
use File::Glob ();
use File::Basename ();
use File::Path ();
use File::Copy ();
use ExtUtils::MakeMaker 7.12;

# ABSTRACT: FFI::Build installer code for ExtUtils::MakeMaker
our $VERSION = '1.34'; # VERSION


sub new
{
  my($class, %opt) = @_;

  my $save = defined $opt{save} ? $opt{save} : 1;

  my $self = bless { save => $save }, $class;
  $self->load_prop;

  $self;
}


sub mm_args
{
  my($self, %args) = @_;

  if($args{DISTNAME})
  {
    $self->{prop}->{distname} ||= $args{DISTNAME};
    $self->{prop}->{share}    ||= "blib/lib/auto/share/dist/@{[ $self->distname ]}";
    $self->{prop}->{arch}     ||= "blib/arch/auto/@{[ join '/', split /-/, $self->distname ]}";
    $self->save_prop;
  }
  else
  {
    Carp::croak "DISTNAME is required";
  }


  if(my $build = $self->build)
  {
    foreach my $alien (@{ $build->alien })
    {
      next if ref $alien;
      $args{BUILD_REQUIRES}->{$alien} ||= 0;
    }
  }

  if(my $test = $self->test)
  {
    foreach my $alien (@{ $test->alien })
    {
      next if ref $alien;
      $args{TEST_REQUIRES}->{$alien} ||= 0;
    }
  }

  %args;
}

sub distname { shift->{prop}->{distname} }

sub sharedir
{
  my($self, $new) = @_;

  if(defined $new)
  {
    $self->{prop}->{share} = $new;
    $self->save_prop;
  }

  $self->{prop}->{share};
}

sub archdir
{
  my($self, $new) = @_;

  if(defined $new)
  {
    $self->{prop}->{arch} = $new;
    $self->save_prop;
  }

  $self->{prop}->{arch};
}

sub load_build
{
  my($self, $dir, $name, $install) = @_;
  return unless -d $dir;
  my($fbx) = File::Glob::bsd_glob("./$dir/*.fbx");

  my $options;
  my $platform = FFI::Build::Platform->default;

  if($fbx)
  {
    $name = File::Basename::basename($fbx);
    $name =~ s/\.fbx$//;
    $options = do {
      package FFI::Build::MM::FBX;
      our $DIR      = $dir;
      our $PLATFORM = $platform;

      # make sure we catch all of the errors
      # code copied from `perldoc -f do`
      my $return = do $fbx;
      unless ( $return  ) {
          Carp::croak( "couldn't parse $fbx: $@" ) if $@;
          Carp::croak( "couldn't do $fbx: $!" )     unless defined $return;
          Carp::croak( "couldn't run $fbx" )       unless $return;
      }

      $return;
    };
  }
  else
  {
    $name ||= $self->distname;
    $options = {
      source => ["$dir/*.c", "$dir/*.cxx", "$dir/*.cpp"],
    };
    # if we see a Go, Rust control file then we assume the
    # ffi mod is written in that language.
    foreach my $control_file ("$dir/Cargo.toml", "$dir/go.mod")
    {
      if(-f $control_file)
      {
        $options->{source} = [$control_file];
        last;
      }
    }
  }

  $options->{platform} ||= $platform;
  $options->{dir}      ||= ref $install ? $install->($options) : $install;
  $options->{verbose}  = 1 unless defined $options->{verbose};
  FFI::Build->new($name, %$options);
}

sub build
{
  my($self) = @_;
  $self->{build} ||= $self->load_build('ffi', undef, $self->sharedir . "/lib");
}

sub test
{
  my($self) = @_;
  $self->{test} ||= $self->load_build('t/ffi', 'test', sub {
    my($opt) = @_;
    my $buildname = $opt->{buildname} || '_build';
    "t/ffi/$buildname";
  });
}

sub save_prop
{
  my($self) = @_;
  return unless $self->{save};
  open my $fh, '>', 'fbx.json';
  print $fh JSON::PP::encode_json($self->{prop});
  close $fh;
}

sub load_prop
{
  my($self) = @_;
  return unless $self->{save};
  unless(-f 'fbx.json')
  {
    $self->{prop} = {};
    return;
  }
  open my $fh, '<', 'fbx.json';
  $self->{prop} = JSON::PP::decode_json(do { local $/; <$fh> });
  close $fh;
}

sub clean
{
  my($self) = @_;
  foreach my $stage (qw( build test ))
  {
    my $build = $self->$stage;
    $build->clean if $build;
  }
  unlink 'fbx.json' if -f 'fbx.json';
}


sub mm_postamble
{
  my($self) = @_;

  my $postamble = ".PHONY: fbx_build ffi fbx_test ffi-test fbx_clean ffi-clean\n\n";

  # make fbx_realclean ; make clean
  $postamble .= "realclean :: fbx_clean\n" .
                "\n" .
                "fbx_clean ffi-clean:\n" .
                "\t\$(FULLPERL) -MFFI::Build::MM=cmd -e fbx_clean\n\n";

  # make fbx_build; make
  $postamble .= "pure_all :: fbx_build\n" .
                "\n" .
                "fbx_build ffi:\n" .
                "\t\$(FULLPERL) -MFFI::Build::MM=cmd -e fbx_build\n\n";

  # make fbx_test; make test
  $postamble .= "subdirs-test_dynamic subdirs-test_static subdirs-test :: fbx_test\n" .
                "\n" .
                "fbx_test ffi-test:\n" .
                "\t\$(FULLPERL) -MFFI::Build::MM=cmd -e fbx_test\n\n";

  $postamble;
}

sub action_build
{
  my($self) = @_;
  my $build = $self->build;
  if($build)
  {
    my $lib = $build->build;
    if($self->archdir)
    {
      File::Path::mkpath($self->archdir, 0, oct(755));
      my $archfile = File::Spec->catfile($self->archdir, File::Basename::basename($self->archdir) . ".txt");
      open my $fh, '>', $archfile;
      my $lib_path = $lib->path;
      $lib_path =~ s/^blib\/lib\///;
      print $fh "FFI::Build\@$lib_path\n";
      close $fh;
    }
  }
  return;
}

sub action_test
{
  my($self) = @_;
  my $build = $self->test;
  $build->build if $build;
}

sub action_clean
{
  my($self) = @_;
  my $build = $self->clean;
  ();
}

sub import
{
  my(undef, @args) = @_;
  foreach my $arg (@args)
  {
    if($arg eq 'cmd')
    {
      package main;

      my $mm = sub {
        my($action) = @_;
        my $build = FFI::Build::MM->new;
        $build->$action;
      };

      no warnings 'once';

      *fbx_build = sub {
        $mm->('action_build');
      };

      *fbx_test = sub {
        $mm->('action_test');
      };

      *fbx_clean = sub {
        $mm->('action_clean');
      };
    }
  }
}

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

FFI::Build::MM - FFI::Build installer code for ExtUtils::MakeMaker

=head1 VERSION

version 1.34

=head1 SYNOPSIS

In your Makefile.PL:

 use ExtUtils::MakeMaker;
 use FFI::Build::MM;
 
 my $fbmm = FFI::Build::MM->new;
 
 WriteMakefile($fbmm->mm_args(
   ABSTRACT     => 'My FFI extension',
   DISTNAME     => 'Foo-Bar-Baz-FFI',
   NAME         => 'Foo::Bar::Baz::FFI',
   VERSION_FROM => 'lib/Foo/Bar/Baz/FFI.pm',
   ...
 ));
 
 sub MY::postamble {
   $fbmm->mm_postamble;
 }

Then put the C, C++ or Fortran files in C<./ffi> for your runtime library
and C<./t/ffi> for your test time library.

=head1 DESCRIPTION

This module provides a thin layer between L<FFI::Build> and L<ExtUtils::MakeMaker>.
Its interface is influenced by the design of L<Alien::Build::MM>.  The idea is that
for your distribution you throw some C, C++ or Fortran source files into a directory
called C<ffi> and these files will be compiled and linked into a library that can
be used by your module.  There is a control file C<ffi/*.fbx> which can be used to
control the compiler and linker options.  (options passed directly into L<FFI::Build>).
The interface for this file is still under development.

=head1 CONSTRUCTOR

=head2 new

 my $fbmm = FFI::Build::MM->new;

Create a new instance of L<FFI::Build::MM>.

=head1 METHODS

=head2 mm_args

 my %new_args = $fbmm->mm_args(%old_args);

This method does two things:

=over 4

=item reads the arguments to determine sensible defaults (library name, install location, etc).

=item adjusts the arguments as necessary and returns an updated set of arguments.

=back

=head2 mm_postamble

 my $postamble = $fbmm->mm_postamble;

This returns the Makefile postamble used by L<ExtUtils::MakeMaker>.  The synopsis above for
how to invoke it properly.  It adds the following Make targets:

=over 4

=item fbx_build / ffi

build the main runtime library in C<./ffi>.

=item fbx_test / ffi-test

Build the test library in C<./t/ffi>.

=item fbx_clean / ffi-clean

Clean any runtime or test libraries already built.

=back

Normally you do not need to build these targets manually, they will be built automatically
at the appropriate stage.

=head1 AUTHOR

Author: Graham Ollis E<lt>plicease@cpan.orgE<gt>

Contributors:

Bakkiaraj Murugesan (bakkiaraj)

Dylan Cali (calid)

pipcet

Zaki Mughal (zmughal)

Fitz Elliott (felliott)

Vickenty Fesunov (vyf)

Gregor Herrmann (gregoa)

Shlomi Fish (shlomif)

Damyan Ivanov

Ilya Pavlov (Ilya33)

Petr Pisar (ppisar)

Mohammad S Anwar (MANWAR)

Håkon Hægland (hakonhagland, HAKONH)

Meredith (merrilymeredith, MHOWARD)

Diab Jerius (DJERIUS)

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2015,2016,2017,2018,2019,2020 by Graham Ollis.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut
