import datetime
from typing import Optional, SupportsInt


def flagconverter(code: str):
    """Converts the specified country code to a flag."""
    if code is None:
        return ''

    if len(code) == 1 or len(code) > 2:
        raise ValueError("CC too short or long")

    res = f"{''.join(chr(127397 + ord(str.upper(k))) for k in code)}"
    return res


def bigip(x: int):
    """Converts a BIG formatted IP address to a human-readable format"""
    return '.'.join([str(y) for y in int.to_bytes(int(x), 4, 'big')])


def humanize_timedelta(
    *, timedelta: Optional[datetime.timedelta] = None, seconds: Optional[SupportsInt] = None
) -> str:
    """
    Get a locale aware human timedelta representation.

    This works with either a timedelta object or a number of seconds.

    Fractional values will be omitted, and values less than 1 second
    an empty string.

    Parameters
    ----------
    timedelta: Optional[datetime.timedelta]
        A timedelta object
    seconds: Optional[SupportsInt]
        A number of seconds

    Returns
    -------
    str
        A locale aware representation of the timedelta or seconds.

    Raises
    ------
    ValueError
        The function was called with neither a number of seconds nor a timedelta object
    """

    try:
        obj = seconds if seconds is not None else timedelta.total_seconds()
    except AttributeError:
        raise ValueError("You must provide either a timedelta or a number of seconds")

    seconds = int(obj)
    periods = [
        ("year", "years", 60 * 60 * 24 * 365),
        ("month", "months", 60 * 60 * 24 * 30),
        ("day", "days", 60 * 60 * 24),
        ("hour", "hours", 60 * 60),
        ("minute", "minutes", 60),
        ("second", "seconds", 1),
    ]

    strings = []
    for period_name, plural_period_name, period_seconds in periods:
        if seconds >= period_seconds:
            period_value, seconds = divmod(seconds, period_seconds)
            if period_value == 0:
                continue
            unit = plural_period_name if period_value > 1 else period_name
            strings.append(f"{period_value} {unit}")

    return ", ".join(strings)