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"""Utility functions for switchbot."""
from functools import lru_cache
@lru_cache(maxsize=512)
def format_mac_upper(mac: str) -> str:
"""Format the mac address string to uppercase with colons."""
to_test = mac
if len(to_test) == 17 and to_test.count(":") == 5:
return to_test.upper()
if len(to_test) == 17 and to_test.count("-") == 5:
to_test = to_test.replace("-", "")
elif len(to_test) == 14 and to_test.count(".") == 2:
to_test = to_test.replace(".", "")
if len(to_test) == 12:
# no : included
return ":".join(to_test.upper()[i : i + 2] for i in range(0, 12, 2))
# Not sure how formatted, return original
return mac.upper()
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