# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
"""The daily report, driven by an injected clock."""

from __future__ import annotations

import datetime as dt

from signal_bot.scheduler import SECONDS_PER_DAY, Action, DailyScheduler


def _scheduler(action: Action, now: dt.datetime, slept: list[float]) -> DailyScheduler:
    async def sleeper(seconds: float) -> None:
        slept.append(seconds)

    return DailyScheduler(21, 37, action, lambda: now, sleeper)


async def _noop() -> None:
    return None


def test_waits_until_later_today() -> None:
    now = dt.datetime(2026, 8, 29, 20, 37, tzinfo=dt.UTC)
    assert _scheduler(_noop, now, []).seconds_until_next(now) == 3600


def test_rolls_over_to_tomorrow_once_passed() -> None:
    now = dt.datetime(2026, 8, 29, 22, 37, tzinfo=dt.UTC)
    assert _scheduler(_noop, now, []).seconds_until_next(now) == SECONDS_PER_DAY - 3600


def test_exact_target_time_waits_a_full_day() -> None:
    """Never returns zero, which would busy-loop the report."""
    now = dt.datetime(2026, 8, 29, 21, 37, tzinfo=dt.UTC)
    assert _scheduler(_noop, now, []).seconds_until_next(now) == SECONDS_PER_DAY


async def test_runs_the_action_after_sleeping() -> None:
    calls: list[int] = []
    slept: list[float] = []

    async def action() -> None:
        calls.append(1)

    now = dt.datetime(2026, 8, 29, 20, 37, tzinfo=dt.UTC)
    await _scheduler(action, now, slept).run(iterations=2)
    assert calls == [1, 1]
    assert slept == [3600, 3600]


async def test_a_failing_report_does_not_stop_the_loop() -> None:
    calls: list[int] = []

    async def action() -> None:
        calls.append(1)
        msg = "signal is down"
        raise RuntimeError(msg)

    now = dt.datetime(2026, 8, 29, 20, 37, tzinfo=dt.UTC)
    await _scheduler(action, now, []).run(iterations=2)
    assert calls == [1, 1]


async def test_zero_iterations_does_nothing() -> None:
    slept: list[float] = []
    now = dt.datetime(2026, 8, 29, 20, 37, tzinfo=dt.UTC)
    await _scheduler(_noop, now, slept).run(iterations=0)
    assert slept == []