# retoor <retoor@molodetz.nl>

import queue
import threading

from tests.conftest import run_async
from devplacepy.services.background import BackgroundQueue


def _fill(direct_queue, count, executed):
    for _ in range(count):
        direct_queue.put_nowait((executed.append, ("x",), {}))


def test_stop_without_start_returns_cleanly():
    direct = BackgroundQueue()
    run_async(direct.stop())
    assert direct.stats()["running"] is False


def test_stop_full_queue_does_not_block():
    direct = BackgroundQueue(maxsize=4)
    dead = threading.Thread(target=lambda: None)
    dead.start()
    dead.join()
    direct._thread = dead
    executed = []
    _fill(direct._queue, 4, executed)
    run_async(direct.stop())
    assert executed == ["x"] * 4


def test_stop_bounds_shutdown_drain_and_counts_dropped():
    from devplacepy.services.background import SHUTDOWN_DRAIN_MAX

    direct = BackgroundQueue(maxsize=5000)
    executed = []
    _fill(direct._queue, SHUTDOWN_DRAIN_MAX + 200, executed)
    run_async(direct.stop())
    stats = direct.stats()
    assert len(executed) == SHUTDOWN_DRAIN_MAX
    assert stats["dropped"] == 200


def test_start_stop_roundtrip_executes_submitted_task():
    direct = BackgroundQueue()
    run_async(direct.start())
    try:
        executed = []
        direct.submit(executed.append, "x")
    finally:
        run_async(direct.stop())
    assert executed == ["x"]
    assert direct.stats()["running"] is False