import datetime

SECONDS_PER_MINUTE = 60
MINUTES_PER_HOUR = 60
SECONDS_PER_HOUR = SECONDS_PER_MINUTE * MINUTES_PER_HOUR


def seconds_to_iso8601_duration(seconds: int) -> str:
    hours, minutes_in_seconds = divmod(seconds, SECONDS_PER_HOUR)
    minutes, seconds = divmod(minutes_in_seconds, SECONDS_PER_MINUTE)

    return f"PT{hours}H{minutes}M{seconds}S"


def convert_date_to_string(date: datetime.date, date_format: str = "%Y-%m-%d") -> str:
    return date.strftime(date_format)


def get_datetime_from_string(date_string: str) -> datetime.datetime:
    """Get datetime from string and expected known formats."""
    known_formats = [
        "%Y-%m-%d",
        "%Y-%m-%d %H:%M:%S",
        "%Y-%m-%dT%H:%M:%S",
        "%Y-%m-%dT%H:%M:%SZ",
    ]
    for fmt in known_formats:
        try:
            return datetime.datetime.strptime(date_string, fmt)
        except ValueError:
            continue
    raise ValueError(f"Date '{date_string}' is not in a known format.")


def get_datetime_from_string_or_none(
    date_string: str | None,
) -> datetime.datetime | None:
    """Get datetime from string. Handle None input."""
    if date_string is None:
        return None
    return get_datetime_from_string(date_string)