"""Tests for backend/worker.py — Celery configuration."""

import importlib
import sys
from unittest.mock import patch


def test_celery_app_is_importable():
    """worker.py exports a celery_app instance."""
    # Need to ensure config module is importable
    backend_dir = str(__import__("pathlib").Path(__file__).resolve().parents[1])
    if backend_dir not in sys.path:
        sys.path.insert(0, backend_dir)

    import worker
    assert hasattr(worker, "celery_app")
    assert worker.celery_app.main == "promptlooper"


def test_celery_app_serializer_settings():
    """Verify JSON serialization is configured."""
    backend_dir = str(__import__("pathlib").Path(__file__).resolve().parents[1])
    if backend_dir not in sys.path:
        sys.path.insert(0, backend_dir)

    import worker
    assert worker.celery_app.conf.task_serializer == "json"
    assert worker.celery_app.conf.result_serializer == "json"


def test_celery_defaults_to_memory_broker_without_redis():
    """Without REDIS_URL, broker falls back to memory://."""
    backend_dir = str(__import__("pathlib").Path(__file__).resolve().parents[1])
    if backend_dir not in sys.path:
        sys.path.insert(0, backend_dir)

    with patch.dict("os.environ", {"REDIS_URL": ""}, clear=False):
        # Force reload to pick up env change
        if "config" in sys.modules:
            importlib.reload(sys.modules["config"])
        if "worker" in sys.modules:
            importlib.reload(sys.modules["worker"])

        import worker
        # In no-redis mode, broker should be memory://
        # (may have been set from settings.redis_url == None)
        assert worker.celery_app is not None