import re

pattern = re.compile(r"[^a-zA-Z0-9.#/\-]")


def sanitize_as_rabbitmq_name(input_str: str) -> str:
    matcher = pattern.search(input_str)
    token = input_str[: matcher.start()] if matcher else input_str
    return sanitize_as_rabbitmq_domain_name(token)


def sanitize_as_rabbitmq_domain_name(token: str) -> str:
    # Step 1: Replace non-alphanumeric characters (except periods) with a period
    step1 = re.sub(r"[^A-Za-z0-9.#]", ".", token)
    # Step 2: Replace multiple consecutive periods with a single period
    step2 = re.sub(r"\.+", ".", step1)
    # Step 3: Remove trailing '.' character, if applicable
    step_last_char = len(step2) - 1
    return step2[:-1] if step_last_char > 0 and step2[step_last_char] == "." else step2