use strict;
use warnings;
use Test::More tests => 17;

BEGIN {
    package MooseX::Singleton::Test;
    use MooseX::Singleton;

    has bag => (
        is      => 'rw',
        isa     => 'HashRef[Int]',
        default => sub { { default => 42 } },
    );

    sub distinct_keys {
        my $self = shift;
        scalar keys %{ $self->bag };
    }

    sub clear {
        my $self = shift;
        $self->bag({});
    }

    sub add {
        my $self = shift;
        my $key = shift;
        my $value = @_ ? shift : 1;

        $self->bag->{$key} += $value;
    }
}

my $mst = MooseX::Singleton::Test->instance;
isa_ok($mst, 'MooseX::Singleton::Test', 'Singleton->instance returns a real instance');

is($mst->distinct_keys, 1, "default keys");

$mst->add(foo => 10);
is($mst->distinct_keys, 2, "added key");

$mst->add(bar => 5);
is($mst->distinct_keys, 3, "added another key");

my $mst2 = MooseX::Singleton::Test->instance;
is($mst, $mst2, 'instances are the same object');
isa_ok($mst2, 'MooseX::Singleton::Test', 'Singleton->instance returns a real instance');

is($mst2->distinct_keys, 3, "keys from before");

$mst->add(baz => 2);

is($mst->distinct_keys, 4, "attributes are shared even after ->instance");
is($mst2->distinct_keys, 4, "attributes are shared even after ->instance");

is(MooseX::Singleton::Test->distinct_keys, 4, "Package->reader works");

MooseX::Singleton::Test->add(quux => 9000);

is($mst->distinct_keys, 5, "Package->add works");
is($mst2->distinct_keys, 5, "Package->add works");
is(MooseX::Singleton::Test->distinct_keys, 5, "Package->add works");

MooseX::Singleton::Test->clear;

is($mst->distinct_keys, 0, "Package->clear works");
is($mst2->distinct_keys, 0, "Package->clear works");
is(MooseX::Singleton::Test->distinct_keys, 0, "Package->clear works");

MooseX::Singleton::Test->_clear_instance;
$mst = $mst2 = undef;
is(MooseX::Singleton::Test->new->distinct_keys, 1, "back to the default");