from dataclasses import replace
from typing import List, Sequence

from .todo_item import Todo
from .todo_list_add_todo import require_utc_now
from .todo_list_toggle_todo import complete_todo, require_today


def toggle_all(todos: Sequence[Todo], now: str, today: str) -> List[Todo]:
    """Complete every open todo as toggle_todo would, or reopen all once none is open."""
    require_utc_now(now)
    require_today(today)
    if any(not t.done for t in todos):
        return [t if t.done else complete_todo(t, now, today) for t in todos]
    return [replace(t, done=False, completed_at=None) for t in todos]