package My::Config;

use strict;
use warnings;
use Config;
use File::Spec;
use FindBin;
use Text::ParseWords qw( shellwords );
use My::BuildConfig;
use My::ShareConfig;
use My::ConfigH;
use My::ShareConfig;
use lib 'lib';
use FFI::Probe;
use FFI::Probe::Runner;
use FFI::Probe::Runner::Builder;
use File::Glob qw( bsd_glob );
use File::Basename qw( basename );
use JSON::PP qw( decode_json );

my @probe_types = split /\n/, <<EOF;
char
signed char
unsigned char
short
signed short
unsigned short
int
signed int
unsigned int
long
signed long
unsigned long
uint8_t
int8_t
uint16_t
int16_t
uint32_t
int32_t
uint64_t
int64_t
size_t
ssize_t
SSIZE_T
float
double
long double
float complex
double complex
long double complex
bool
_Bool
pointer
uintptr_t
intptr_t
enum
senum
intmax_t
uintmax_t
EOF

my @extra_probe_types = split /\n/, <<EOF;
long long
signed long long
unsigned long long
dev_t
ino_t
mode_t
nlink_t
uid_t
gid_t
off_t
blksize_t
blkcnt_t
time_t
ptrdiff_t
wchar_t
wint_t
EOF

push @probe_types, @extra_probe_types unless $ENV{FFI_PLATYPUS_NO_EXTRA_TYPES};

sub new
{
  my($class) = @_;
  bless {}, $class;
}

my $ppport_h = File::Spec->catfile(qw( include ppport.h ));

sub generate_dev
{
  if(!-r $ppport_h || -d '.git')
  {
    my $ppport_version = 3.28;
    require Devel::PPPort;
    die "Devel::PPPort $ppport_version or better required for development"
      unless $Devel::PPPort::VERSION >= $ppport_version;

    my $old = '';
    if(-e $ppport_h)
    {
      open my $fh, '<', $ppport_h;
      $old = do { local $/; <$fh> };
      close $fh;
    }

    my $content = Devel::PPPort::GetFileContents('include/ppport.h');

    if($content ne $old)
    {
      print "XX $ppport_h\n";
      open my $fh, '>', $ppport_h;
      print $fh $content;
      close $fh;
    }
  }
}

sub clean
{
  unlink $ppport_h;
}

sub share_config
{
  my($self) = @_;
  $self->{share_config} ||= My::ShareConfig->new;
}

sub build_config
{
  my($self) = @_;
  $self->{build_config} ||= My::BuildConfig->new;
}

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

  $self->{probe} ||= FFI::Probe->new(
    runner => $self->probe_runner,
    log => "config.log",
    data_filename => "./blib/lib/auto/share/dist/FFI-Platypus/probe/probe.pl",
    alien => [$self->build_config->get('alien')->{class}],
    cflags => ['-Iinclude'],
  );
}

sub probe_runner
{
  my($self) = @_;
  my $builder = FFI::Probe::Runner::Builder->new;
  my $exe = $builder->exe;
  if(-e $exe)
  {
    return FFI::Probe::Runner->new( exe => $exe );
  }
  else
  {
    return undef;
  }
}

sub probe_runner_build
{
  my($self) = @_;
  my $probe = $self->probe;
  my $builder = FFI::Probe::Runner::Builder->new;
  foreach my $key (qw( cc ccflags optimize ld ldflags ))
  { @{ $builder->$key } = @{ $self->build_config->get('eumm')->{$key} } }
  $builder->build unless -e $builder->exe;
}

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

  my $probe = $self->probe;

  my $config_h = File::Spec->rel2abs( File::Spec->catfile( 'include', 'ffi_platypus_config.h' ) );
  return if -r $config_h && ref($self->share_config->get( 'type_map' )) eq 'HASH';

  my $ch = My::ConfigH->new;

  $ch->define_var( do {
    my $os = uc $^O;
    $os =~ s/-/_/;
    $os =~ s/[^A-Z0-9_]//g;
    "PERL_OS_$os";
  } => 1 );

  $ch->define_var( PERL_OS_WINDOWS => 1 ) if $^O =~ /^(MSWin32|cygwin|msys)$/;

  {
    my($major, $minor, $patch) = $] =~ /^(5|[7-9])\.([0-9]{3})([0-9]{3})/;
    $ch->define_var( FFI_PL_PERL_VERSION_MAJOR => int $major );
    $ch->define_var( FFI_PL_PERL_VERSION_MINOR => int $minor );
    $ch->define_var( FFI_PL_PERL_VERSION_PATCH => int $patch );
  }

  {
    my($major, $minor, $patch) = (@{ $self->build_config->get('version') }, 0);
    $ch->define_var( FFI_PL_VERSION_MAJOR => int $major );
    $ch->define_var( FFI_PL_VERSION_MINOR => int $minor );
    $ch->define_var( FFI_PL_VERSION_PATCH => int $patch );
  }

  foreach my $header (qw( stdlib stdint sys/types sys/stat unistd alloca dlfcn limits stddef wchar signal inttypes windows sys/cygwin string psapi stdio stdbool complex ))
  {
    if($probe->check_header("$header.h"))
    {
      my $var = uc $header;
      $var =~ s{/}{_}g;
      $var = "HAVE_${var}_H";
      $ch->define_var( $var => 1 );
    }
  }

  if(!$self->build_config->get('config_debug_fake32') && $Config{ivsize} >= 8)
  {
    $ch->define_var( HAVE_IV_IS_64 => 1 );
  }

  my %type_map;
  my %align;

  foreach my $type (@probe_types)
  {
    if($type =~ /^(float|double|long double)/)
    {
      if(my $basic = $probe->check_type_float($type))
      {
        $type_map{$type} = $basic;
        $align{$type} = $probe->data->{type}->{$type}->{align};
      }
    }
    elsif($type eq 'pointer')
    {
      $probe->check_type_pointer;
      $align{pointer} = $probe->data->{type}->{pointer}->{align};
    }
    elsif($type eq 'enum')
    {
      if(my $basic = $probe->check_type_enum)
      {
        $type_map{enum} = $basic;
        $align{$basic} ||= $probe->data->{type}->{enum}->{align};
      }
    }
    elsif($type eq 'senum')
    {
      if(my $basic = $probe->check_type_signed_enum)
      {
        $type_map{senum} = $basic;
        $align{$basic} ||= $probe->data->{type}->{senum}->{align};
      }
    }
    else
    {
      if(my $basic = $probe->check_type_int($type))
      {
        $type_map{$type} = $basic;
        $align{$basic} ||= $probe->data->{type}->{$type}->{align};
      }
      elsif($type =~ /^(unsigned |signed )?(char|short|int|long)$/)
      {
        print "Unable to perform basic type check for: \"$type\"\n";
        print "Please check config.log for detailed diagnostics.\n";
        die "unable to configure Platypus";
      }
    }
  }

  # Visual C++ uses SSIZE_T instead of ssize_t
  if($^O eq 'MSWin32' && $Config{ccname} eq 'cl' && defined $type_map{SSIZE_T})
  {
    $type_map{ssize_t} = delete $type_map{SSIZE_T};
  }
  elsif(defined $type_map{SSIZE_T})
  {
    delete $type_map{SSIZE_T};
  }

  $ch->define_var( SIZEOF_VOIDP => $probe->data->{type}->{pointer}->{size} );
  if(my $size = $probe->data->{type}->{'float complex'}->{size})
  { $ch->define_var( SIZEOF_FLOAT_COMPLEX => $size ) }
  if(my $size = $probe->data->{type}->{'double complex'}->{size})
  { $ch->define_var( SIZEOF_DOUBLE_COMPLEX => $size ) }
  if(my $size = $probe->data->{type}->{'long double complex'}->{size})
  { $ch->define_var( SIZEOF_LONG_DOUBLE_COMPLEX => $size ) }

  # short aliases
  $type_map{uchar}  = $type_map{'unsigned char'};
  $type_map{ushort} = $type_map{'unsigned short'};
  $type_map{uint}   = $type_map{'unsigned int'};
  $type_map{ulong}  = $type_map{'unsigned long'};

  # on Linux and OS X at least the test for bool fails
  # but _Bool works (even though code using bool seems
  # to work for both).  May be because bool is a macro
  # for _Bool or something.
  $type_map{bool} ||= delete $type_map{_Bool};
  delete $type_map{_Bool};

  $ch->write_config_h;

  my %probe;
  if(defined $ENV{FFI_PLATYPUS_PROBE_OVERRIDE})
  {
    foreach my $kv (split /:/, $ENV{FFI_PLATYPUS_PROBE_OVERRIDE})
    {
      my($k,$v) = split /=/, $kv, 2;
      $probe{$k} = $v;
    }
  }

  if($Config{byteorder} =~ /^(1234|12345678)$/)
  {
    $probe{bigendian}   = 0;
    $probe{bigendian64} = 0;
  }

  if($self->build_config->get('config_no_alloca'))
  {
    $probe{alloca} = 0;
  }

  foreach my $cfile (bsd_glob 'inc/probe/*.c')
  {
    my $name = basename $cfile;
    $name =~ s/\.c$//;
    unless(defined $probe{$name})
    {
      my $code = do {
        my $fh;
        open $fh, '<', $cfile;
        local $/;
        <$fh>;
      };
      my $value = $probe->check($name, $code);
      $probe{$name} = $value if defined $value;
    }
    if($probe{$name})
    {
      $ch->define_var( "FFI_PL_PROBE_" . uc($name) => 1 );
    }
  }

  my %abi;

  if(my $cpp_output = $probe->check_cpp("#include <ffi.h>\n"))
  {
    if($cpp_output =~ m/typedef\s+enum\s+ffi_abi\s+{(.*?)}/s)
    {
      my $enum = $1;
      my %seen;
      while($enum =~ s/FFI_([A-Z_0-9]+)//)
      {
        my $abi = $1;
        next if $seen{$abi};
        $seen{$abi}++;
        next if $abi =~ /^(FIRST|LAST)_ABI$/;
        $probe->check_eval(
          decl => [
            "#include \"ffi_platypus.h\"",
          ],
          stmt => [
            "ffi_cif cif;",
            "ffi_type *args[1];",
            "ffi_abi abi;",
            "if(ffi_prep_cif(&cif, FFI_$abi, 0, &ffi_type_void, args) != FFI_OK) { return 2; }",
          ],
          eval => {
            "abi.@{[ lc $abi ]}" => [ '%d' => "FFI_$abi" ],
          },
        );
      }
      if(defined $probe->data->{abi})
      {
        %abi = %{ $probe->data->{abi} || {} };
      }
      else
      {
        $probe->log("[[[ Unable to verify any ffi_abis ]]]");
        print "*** Unable to detect ffi_abis     ***\n";
        print "[[[ Unable to verify any ffi_abis ]]]\n";
        print "[[[ will try all known ABIs       ]]]\n";
      }
    }
    else
    {
      $probe->log("[[[ ffi_abi enum not found ]]]");
      print "*** Unable to detect ffi_abis     ***\n";
      print "[[[ ffi_abi enum not found        ]]]\n";
      print "[[[ will try all known ABIs       ]]]\n";
    }
  }
  else
  {
    $probe->log("[[[ C pre-processor failed... ]]]");
    print "*** Unable to detect ffi_abis     ***\n";
    print "[[[ C pre-processor failed...     ]]]\n";
    print "[[[ will try all known ABIs       ]]]\n";
  }

  unless(%abi)
  {
    if($probe->check_eval(
      decl => [
        "#include \"ffi_platypus.h\"",
      ],
      eval => {
        "abi.default_abi" => [ '%d' => "FFI_DEFAULT_ABI" ],
      },
    ))
    {
      open my $fh, '<', 'inc/abi/abis-all.json'
        or die "unable to read abis-all.json $!";
      my @abis = @{ decode_json(do { local $/; <$fh> }) };
      close $fh;

      foreach my $abi (@abis)
      {
        $probe->check_eval(
          decl => [
            "#include \"ffi_platypus.h\"",
          ],
          stmt => [
            "ffi_cif cif;",
            "ffi_type *args[1];",
            "ffi_abi abi;",
            "if(ffi_prep_cif(&cif, FFI_$abi, 0, &ffi_type_void, args) != FFI_OK) { return 2; }",
          ],
          eval => {
            "abi.@{[ lc $abi ]}" => [ '%d' => "FFI_$abi" ],
          },
        );
      }

      %abi = %{ $probe->data->{abi} || {} };
    }
    else
    {
      $probe->log("[[[ fatal: unable to determine even the default ABI ]]]");
      print "Unable to determine even the default ABI\n";
      die "unable to configure Platypus";
    }
  }

  $ch->write_config_h;
  $self->share_config->set( type_map => \%type_map );
  $self->share_config->set( align    => \%align    );
  $self->share_config->set( probe    => \%probe    );
  $self->share_config->set( abi      => \%abi      );
}

sub platform
{
  my($self) = @_;
  my %Config = %Config;
  my $eumm = $self->build_config->get('eumm');
  foreach my $key (keys %$eumm)
  {
    $Config{$key} = $eumm->{$key};
  }
  require FFI::Build::Platform;
  FFI::Build::Platform->new(\%Config);
}

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

  my $class = $self->build_config->get('alien')->{class};
  my $pm = "$class.pm";
  $pm =~ s/::/\//g;
  require $pm;

  $self->build_config->get('alien')->{class};
}

1;