"""Date-window helpers for the 11-day pipeline horizon."""

from __future__ import annotations

from datetime import date, timedelta


def build_window(as_of: date) -> list[date]:
    """Return the inclusive date list from as_of-5 through as_of+5."""
    return [as_of + timedelta(days=offset) for offset in range(-5, 6)]


def past_days(as_of: date) -> list[date]:
    """Days strictly before as_of within the window (as_of-5 .. as_of-1)."""
    return [as_of + timedelta(days=offset) for offset in range(-5, 0)]


def today_and_future(as_of: date) -> list[date]:
    """as_of through as_of+5 inclusive."""
    return [as_of + timedelta(days=offset) for offset in range(0, 6)]


def format_date(d: date) -> str:
    """Format a date as DD-MM-YYYY for the JSON payload."""
    return d.strftime("%d-%m-%Y")