from .dates_day_of_week import day_of_week
from .dates_days_between import days_between
from .todo_due_status_types import DueStatus
from .todo_item import Todo


def due_status(todo: Todo, today: str) -> DueStatus:
    """One word for where a todo stands today; done wins, this-week is the rest of the ISO week."""
    # Check the dates first, so a bad date is an error even on a done todo.
    if todo.due is not None:
        days_between(today, todo.due)
    else:
        day_of_week(today)
    if todo.done:
        return "done"
    if todo.due is None:
        return "none"
    days = days_between(today, todo.due)
    if days < 0:
        return "overdue"
    if days == 0:
        return "today"
    if days == 1:
        return "tomorrow"
    if days <= 7 - day_of_week(today):
        return "this-week"
    return "later"