"""Unit tests for schedule due-date logic (no DB)."""

from __future__ import annotations

from datetime import date, datetime, timezone

from services.schedule import (
    format_schedule_label,
    initial_due_at,
    next_due_after_completion,
    weekday_bit,
)


def test_interval_daily_label():
    label = format_schedule_label({"schedule_kind": "interval", "interval_days": 1, "weekday_mask": 0})
    assert label == "Täglich"


def test_weekday_mask_next_due_after_friday():
    schedule = {
        "schedule_kind": "weekdays",
        "weekday_mask": weekday_bit(0) | weekday_bit(2) | weekday_bit(4),
        "pause_until": None,
    }
    friday = datetime(2026, 8, 7, 12, 0, tzinfo=timezone.utc)
    nxt = next_due_after_completion(schedule=schedule, completed_at=friday)
    assert nxt.date() == date(2026, 8, 10)


def test_pause_until_pushes_initial_due():
    schedule = {
        "schedule_kind": "interval",
        "interval_days": 1,
        "weekday_mask": 0,
        "pause_until": "2026-08-10",
    }
    now = datetime(2026, 8, 4, 9, 0, tzinfo=timezone.utc)
    due = initial_due_at(schedule=schedule, now=now)
    assert due.date() == date(2026, 8, 11)