"""Regression test: ensure worker.generate_video Celery task is bound to the
real generate_video function, not a helper introduced above it.

Context (P0 incident 2026-08-23): a refactor inserted helper function
_sync_task_config_to_plan directly under the @celery_app.task decorator,
so Celery registered the helper as "worker.generate_video". Calling the
task with a single task_id raised TypeError and every generation job
failed immediately. This test pins the decorator target.
"""

from __future__ import annotations

import inspect


def test_generate_video_task_registered_under_expected_name():
    from worker_app.tasks.generation import generate_video

    # Celery task object exposes its registered name
    assert generate_video.name == "worker.generate_video"


def test_generate_video_task_signature_has_task_id():
    from worker_app.tasks.generation import generate_video

    # For bind=True tasks Celery binds self at call time, so run() signature
    # starts directly with task_id (verified on Celery 5.x).
    sig = inspect.signature(generate_video.run)
    params = list(sig.parameters)
    assert params[0] == "task_id", f"expected task_id as first param, got {params}"


def test_sync_task_config_to_plan_is_plain_function():
    """Helper must NOT be registered as a Celery task."""
    from worker_app.tasks.generation import _sync_task_config_to_plan

    assert not hasattr(
        _sync_task_config_to_plan, "run"
    ), "_sync_task_config_to_plan must be a plain function, not a Celery task"