import json
from pathlib import Path
import pytest
from journal_bot.queue import Queue, QueueItem


@pytest.fixture
def queue(tmp_path):
    return Queue(tmp_path)


def make_item(update_id=1):
    return QueueItem(
        update_id=update_id,
        received_at="2026-06-14T14:32:17+02:00",
        type="text",
        text="Hello world",
    )


def test_enqueue_creates_pending_file(queue, tmp_path):
    queue.enqueue(make_item(1))
    pending = list((tmp_path / "pending").iterdir())
    assert len(pending) == 1
    assert pending[0].name == "1.json"


def test_claim_moves_to_working(queue, tmp_path):
    queue.enqueue(make_item(1))
    item = queue.claim_next()
    assert item is not None
    assert item.update_id == 1
    assert not (tmp_path / "pending" / "1.json").exists()
    assert (tmp_path / "working" / "1.json").exists()


def test_claim_returns_none_when_empty(queue):
    assert queue.claim_next() is None


def test_complete_moves_to_done(queue, tmp_path):
    queue.enqueue(make_item(1))
    item = queue.claim_next()
    queue.complete(item)
    assert (tmp_path / "done" / "1.json").exists()
    assert not (tmp_path / "working" / "1.json").exists()


def test_fail_increments_attempts_and_returns_to_pending(queue, tmp_path):
    queue.enqueue(make_item(1))
    item = queue.claim_next()
    queue.fail(item)
    pending_path = tmp_path / "pending" / "1.json"
    assert pending_path.exists()
    data = json.loads(pending_path.read_text())
    assert data["attempts"] == 1


def test_fail_after_max_attempts_moves_to_failed(queue, tmp_path):
    queue.enqueue(make_item(1))
    for _ in range(3):
        item = queue.claim_next()
        queue.fail(item)
    assert (tmp_path / "failed" / "1.json").exists()
    assert not (tmp_path / "pending" / "1.json").exists()


def test_race_condition_only_one_winner(queue, tmp_path):
    queue.enqueue(make_item(1))
    pending = tmp_path / "pending" / "1.json"
    target = tmp_path / "working" / "1.json"
    target.parent.mkdir(exist_ok=True)
    pending.rename(target)
    assert queue.claim_next() is None