use strict;
use warnings;
use Test::More;

use Devel::Peek qw( SvREFCNT );
use File::Temp qw( tempfile );
use Params::Validate qw( validate SCALAR HANDLE );

{
    my $fh = tempfile();
    my @p  = (
        foo => 1,
        bar => $fh,
    );

    my $ref = val1(@p);

    eval { $ref->{foo} = 2 };
    ok( !$@, 'returned hashref values are not read only' );
    is( $ref->{foo}, 2, 'double check that setting value worked' );
    is( $fh, $ref->{bar}, 'filehandle is not copied during validation' );
}

{

    package ScopeTest;

    my $live = 0;

    sub new { $live++; bless {}, shift }
    sub DESTROY { $live-- }

    sub Live {$live}
}

{
    my @p = ( foo => ScopeTest->new() );

    is(
        ScopeTest->Live(), 1,
        'one live object'
    );

    my $ref = val2(@p);

    isa_ok( $ref->{foo}, 'ScopeTest' );

    @p = ();

    is(
        ScopeTest->Live(), 1,
        'still one live object'
    );

    ok(
        defined $ref->{foo},
        'foo key stays in scope after original version goes out of scope'
    );
    is(
        SvREFCNT( $ref->{foo} ), 1,
        'ref count for reference is 1'
    );

    undef $ref->{foo};

    is(
        ScopeTest->Live(), 0,
        'no live objects'
    );
}

sub val1 {
    my $ref = validate(
        @_, {
            foo => { type => SCALAR },
            bar => { type => HANDLE, optional => 1 },
        },
    );

    return $ref;
}

sub val2 {
    my $ref = validate(
        @_, {
            foo => 1,
        },
    );

    return $ref;
}

done_testing();