import uuid
from typing import Optional

UUID_BYTE_ARRAY_LENGTH = 16


class UuidExtension:
    @staticmethod
    def to_uuid(bytes_: Optional[bytes]) -> uuid.UUID:
        """
        Converts a byte array into a UUID object.
        """
        if bytes_ is None or len(bytes_) != UUID_BYTE_ARRAY_LENGTH:
            raise ValueError(f"Wrong UUID size: expected {UUID_BYTE_ARRAY_LENGTH} bytes, got {len(bytes_)}")

        # Unpack the byte array into two 64-bit integers
        most_sig_bits = int.from_bytes(bytes_[:8], byteorder='big', signed=False)
        least_sig_bits = int.from_bytes(bytes_[8:], byteorder='big', signed=False)

        return uuid.UUID(int=(most_sig_bits << 64) | least_sig_bits)

    @staticmethod
    def to_bytes(uuid_: Optional[uuid.UUID]) -> bytes:
        """
        Converts a UUID object into a byte array.
        """
        if uuid_ is None:
            raise ValueError(f"Input parameter is missing: {uuid.UUID.__name__}")

        # Pack the UUID into a 16-byte array
        return (uuid_.int >> 64).to_bytes(8, byteorder='big') + (uuid_.int & 0xFFFFFFFFFFFFFFFF).to_bytes(8, byteorder='big')