package Net::Works::Role::IP;
$Net::Works::Role::IP::VERSION = '0.20';
use strict;
use warnings;
use namespace::autoclean 0.16;

use Carp qw( confess );
use Math::Int128 qw( string_to_uint128 uint128 uint128_to_number );
use Net::Works::Types qw( Int IPInt IPVersion );
use Socket qw( AF_INET AF_INET6 );

use Moo::Role;

use integer;

has version => (
    is       => 'ro',
    isa      => IPVersion,
    required => 1,
);

has _integer => (
    is       => 'rw',
    writer   => '_set_integer',
    isa      => IPInt,
    required => 1,
);

has address_family => (
    is      => 'ro',
    isa     => Int,
    lazy    => 1,
    default => sub { $_[0]->version() == 6 ? AF_INET6 : AF_INET },
);

{
    my %max = (
        4 => 0xFFFFFFFF,
        6 => string_to_uint128( '0x' . ( 'F' x 32 ) ),
    );

    sub _max {
        my $self = shift;
        my $version = shift // $self->version();

        return $max{$version};
    }
}

sub bits { $_[0]->version() == 6 ? 128 : 32 }

sub _validate_ip_integer {
    my $self = shift;

    my $int = $self->_integer();

    # We don't need to check if it's too big with v6 because uint128 does not
    # allow a number larger than 2**128-1.
    if ( $self->version() == 6 ) {
        $self->_set_integer( uint128($int) )
            unless ref $int;
    }
    else {
        confess("$int is not a valid integer for an IP address")
            if $int >= 2**32;
        if ( ref $int ) {
            $self->_set_integer( uint128_to_number($int) );
        }
    }

    return;
}

# overload passes extra arguments to this sub for some reason
sub _overloaded_as_string {
    return $_[0]->as_string();
}

1;