<?php

namespace App\Models\Objects;

use Illuminate\Contracts\Support\Jsonable;
use InvalidArgumentException;

class Endpoint implements Jsonable
{
    public const CIDR_MAX_BITS = 27;

    public const CIDR_MIN_BITS = 32;

    public const PORT_FLOOR = 1024;

    public const PORT_CEIL = 65535;

    public const PORT_RANGE_LIMIT = 1000;

    public const PORT_RANGE_REGEX = '/^(\d{4,5})-(\d{4,5})$/';

    public const INADDR_ANY = '0.0.0.0';

    public const INADDR_LOOPBACK = '127.0.0.1';

    public int $port;

    public string $ip;

    public function __construct(string|int $port, ?string $ip = null)
    {
        $this->ip = $ip ?? self::INADDR_ANY;
        $this->port = (int) $port;

        if (str_contains($port, ':')) {
            [$this->ip, $port] = explode(':', $port);
            $this->port = (int) $port;
        }

        throw_unless(filter_var($this->ip, FILTER_VALIDATE_IP) !== false, new InvalidArgumentException("$this->ip is an invalid IP address"));
        throw_unless($this->port > self::PORT_FLOOR, "Port $this->port must be greater than " . self::PORT_FLOOR);
        throw_unless($this->port < self::PORT_CEIL, "Port $this->port must be less than " . self::PORT_CEIL);
    }

    public function __toString(): string
    {
        $ip = $this->ip;

        if ($ip === self::INADDR_ANY) {
            return (string) $this->port;
        }

        if ($ip === self::INADDR_LOOPBACK) {
            $ip = 'localhost';
        }

        return "$ip:$this->port";
    }

    public function toJson($options = 0): string
    {
        return json_encode($this->__toString());
    }
}