import os

class bad_apikey_exception(Exception):
    """ This error would be raised, when bad apikey occur. """
    
    def __init__(self) -> None:
        super("Provided ApiKey not exists in database.")

class apikey:
    """
    This create new random API key.
    """

    def __new__(cls, lenght: int = 128) -> str:
        """
        This create new random API key.

        lenght: int - Lenght os the api key (default: 128)
        return: str - API key
        """

        byte = cls.__get_random(lenght)
        string = cls.__to_hex(byte)

        return string

    def __to_hex(byte: bytes) -> str:
        """
        This convert random bytes to string.
        
        byte: bytes - Bytes array to convert
        return: str - Result as string
        """

        return byte.hex()

    def __get_random(lenght: int) -> bytes:
        """
        Get random count of hex chars from os.

        lenght: int - Lenght of the bytes
        return: bytes - Random bytes from os
        """

        return os.urandom(lenght)