class Address

final class Address {
    
    /**
     * A regex that matches a structure like 'Name <email@address.com>'.
     * It matches anything between the first < and last > as email address.
     * This allows to use a single string to construct an Address, which can be convenient to use in
     * config, and allows to have more readable config.
     * This does not try to cover all edge cases for address.
     */
    private const FROM_STRING_PATTERN = '~(?<displayName>[^<]*)<(?<addrSpec>.*)>[^>]*~';
    private static EmailValidator $validator;
    private static IdnAddressEncoder $encoder;
    private string $address;
    private string $name;
    public function __construct(string $address, string $name = '') {
        if (!class_exists(EmailValidator::class)) {
            throw new LogicException(\sprintf('The "%s" class cannot be used as it needs "%s". Try running "composer require egulias/email-validator".', __CLASS__, EmailValidator::class));
        }
        self::$validator ??= new EmailValidator();
        $this->address = trim($address);
        $this->name = trim(str_replace([
            "\n",
            "\r",
        ], '', $name));
        if (!self::$validator->isValid($this->address, class_exists(MessageIDValidation::class) ? new MessageIDValidation() : new RFCValidation())) {
            throw new RfcComplianceException(\sprintf('Email "%s" does not comply with addr-spec of RFC 2822.', $address));
        }
    }
    public function getAddress() : string {
        return $this->address;
    }
    public function getName() : string {
        return $this->name;
    }
    public function getEncodedAddress() : string {
        self::$encoder ??= new IdnAddressEncoder();
        return self::$encoder->encodeString($this->address);
    }
    public function toString() : string {
        return ($n = $this->getEncodedName()) ? $n . ' <' . $this->getEncodedAddress() . '>' : $this->getEncodedAddress();
    }
    public function getEncodedName() : string {
        if ('' === $this->getName()) {
            return '';
        }
        return \sprintf('"%s"', preg_replace('/"/u', '\\"', $this->getName()));
    }
    public static function create(self|string $address) : self {
        if ($address instanceof self) {
            return $address;
        }
        if (!str_contains($address, '<')) {
            return new self($address);
        }
        if (!preg_match(self::FROM_STRING_PATTERN, $address, $matches)) {
            throw new InvalidArgumentException(\sprintf('Could not parse "%s" to a "%s" instance.', $address, self::class));
        }
        return new self($matches['addrSpec'], trim($matches['displayName'], ' \'"'));
    }
    
    /**
     * @param array<Address|string> $addresses
     *
     * @return Address[]
     */
    public static function createArray(array $addresses) : array {
        $addrs = [];
        foreach ($addresses as $address) {
            $addrs[] = self::create($address);
        }
        return $addrs;
    }
    
    /**
     * Returns true if this address' localpart contains at least one
     * non-ASCII character, and false if it is only ASCII (or empty).
     *
     * This is a helper for Envelope, which has to decide whether to
     * the SMTPUTF8 extensions (RFC 6530 and following) for any given
     * message.
     *
     * The SMTPUTF8 extension is strictly required if any address
     * contains a non-ASCII character in its localpart. If non-ASCII
     * is only used in domains (e.g. horst@freiherr-von-mühlhausen.de)
     * then it is possible to send the message using IDN encoding
     * instead of SMTPUTF8. The most common software will display the
     * message as intended.
     */
    public function hasUnicodeLocalpart() : bool {
        return (bool) preg_match('/[\\x80-\\xFF].*@/', $this->address);
    }

}