#!/usr/bin/env python3
# Eryn Wells <eryn@erynwells.me>

import datetime
from typing import Optional


def next_sunday_noon(from_date: Optional[datetime.date] = None) -> datetime.datetime:
    '''
    Return a `datetime` for noon on the upcoming Sunday. Use today if no
    `from_date` is given.
    '''

    today = from_date or datetime.date.today()

    current_weekday = today.weekday()
    if current_weekday == 6:
        days_to_next_sunday = 6
    else:
        days_to_next_sunday = 6 - current_weekday

    delta = datetime.timedelta(days=days_to_next_sunday)

    noon = datetime.time(hour=12)

    timezone = datetime.datetime.now().astimezone().tzinfo
    next_sunday_noon = datetime.datetime.combine(
        today + delta,
        noon,
        tzinfo=timezone
    )

    return next_sunday_noon