use strict;
use warnings;

package Test::Deep::Set 1.204;

use Test::Deep::Cmp;

sub init
{
  my $self = shift;

  $self->{IgnoreDupes} = shift;
  $self->{SubSup} = shift;

  $self->{val} = [];

  $self->add(@_);
}

sub descend
{
  my $self = shift;
  my $d1 = shift;

  my $d2 = $self->{val};

  my $IgnoreDupes = $self->{IgnoreDupes};

  my $data = $self->data;

  my $SubSup = $self->{SubSup};

  my $type = $IgnoreDupes ? "Set" : "Bag";

  my $diag;

  if (ref $d1 ne 'ARRAY')
  {
    my $got = Test::Deep::render_val($d1);
    $diag = <<EOM;
got    : $got
expect : An array to use as a $type
EOM
  }

  if (not $diag)
  {
    my @got = @$d1;
    my @found;
    my @missing;
    foreach my $expect (@$d2)
    {
      my $found = 0;

      for (my $i = $#got; $i >= 0; $i--)
      {
        if (Test::Deep::eq_deeply_cache($got[$i], $expect))
        {
          $found = 1;
          push(@found, $expect);
          splice(@got, $i, 1);

          last unless $IgnoreDupes;
        }
      }

      push(@missing, $expect) unless $found;
    }

    my @diags;
    if (@missing and $SubSup ne "sub" && $SubSup ne "none")
    {
      push(@diags, "Missing: ".nice_list(\@missing));
    }

    if (@got and $SubSup ne "sup" && $SubSup ne "none")
    {
      my $got = __PACKAGE__->new($IgnoreDupes, "", @got);
      push(@diags, "Extra: ".nice_list($got->{val}));
    }

    if (@found and $SubSup eq "none")
    {
      my $found = __PACKAGE__->new($IgnoreDupes, "", @found);
      push(@diags, "Extra: ".nice_list($found->{val}));
    }

    $diag = join("\n", @diags);
  }

  if ($diag)
  {
    $data->{diag} = $diag;

    return 0;
  }
  else
  {
    return 1;
  }
}

sub diagnostics
{
  my $self = shift;
  my ($where, $last) = @_;

  my $type = $self->{IgnoreDupes} ? "Set" : "Bag";
  $type = "Sub$type" if $self->{SubSup} eq "sub";
  $type = "Super$type" if $self->{SubSup} eq "sup";
        $type = "NoneOf" if $self->{SubSup} eq "none";

  my $error = $last->{diag};
  my $diag = <<EOM;
Comparing $where as a $type
$error
EOM

  return $diag;
}

sub add
{
  # this takes an array.

  # For each element A of the array, it looks for an element, B, already in
  # the set which are deeply equal to A. If no matching B is found then A is
  # added to the set. If a B is found and IgnoreDupes is true, then A will
  # be discarded, if IgnoreDupes is false, then B will be added to the set
  # again.
  
  my $self = shift;

  my @array = @_;

  my $IgnoreDupes = $self->{IgnoreDupes};

  my $already = $self->{val};

  local $Test::Deep::Expects = 1;
  foreach my $new_elem (@array)
  {
    my $want_push = 1;
    my $push_this = $new_elem;
    foreach my $old_elem (@$already)
    {
      if (Test::Deep::eq_deeply($new_elem, $old_elem))
      {
        $push_this = $old_elem;
        $want_push = ! $IgnoreDupes;
        last;
      }
    }
    push(@$already, $push_this) if $want_push;
  }

  # so we can compare 2 Test::Deep::Set objects using array comparison

  @$already = sort {(defined $a ? $a : "") cmp (defined $b ? $b : "")} @$already;
}

sub nice_list
{
  my $list = shift;

  my @scalars = grep ! ref $_, @$list;
  my $refs = grep ref $_, @$list;

  my @ref_string = "$refs reference" if $refs;
  $ref_string[0] .= "s" if $refs > 1;

  # sort them so we can predict the diagnostic output

  return join(", ",
    (map {Test::Deep::render_val($_)} sort {(defined $a ? $a : "") cmp (defined $b ? $b : "")} @scalars),
    @ref_string
  );
}

sub compare
{
  my $self = shift;

  my $other = shift;

  return 0 if $self->{IgnoreDupes} != $other->{IgnoreDupes};

  # this works (kind of) because the arrays are sorted

  return Test::Deep::descend($self->{val}, $other->{val});
}

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

Test::Deep::Set

=head1 VERSION

version 1.204

=head1 PERL VERSION

This library should run on perls released even a long time ago.  It should work
on any version of perl released in the last five years.

Although it may work on older versions of perl, no guarantee is made that the
minimum required version will not be increased.  The version may be increased
for any reason, and there is no promise that patches will be accepted to lower
the minimum required perl.

=head1 AUTHORS

=over 4

=item *

Fergal Daly

=item *

Ricardo SIGNES <cpan@semiotic.systems>

=back

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2003 by Fergal Daly.

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
