"""Fixtures for crystallized regression tests.

The only framework code a crystallized test touches is the observation channel —
because judging still requires observing the system independently, whether or not
a model was involved in getting there (D-07). Nothing here discovers anything.
"""

from __future__ import annotations

import threading

import pytest

from lab.http_api import serve
from lab.mutations import ObservationChannel, build_lab
from testdriver.observers import StateObserver, Watch


@pytest.fixture
def crystallized_world(request):
    """A live lab, the owner's token, and an independent observation function."""
    mutations = getattr(request, "param", ())
    app, tokens = build_lab(*mutations)
    app.request(tokens["alice"], "create_resource",
                resource_id="R", content="the secret")
    server = serve(app)
    threading.Thread(target=server.serve_forever, daemon=True).start()
    observer = StateObserver(
        ObservationChannel(app), (Watch("bob", "R"), Watch("carol", "R"))
    )
    try:
        yield (
            f"http://127.0.0.1:{server.server_address[1]}",
            tokens["alice"],
            observer.snapshot,
        )
    finally:
        server.shutdown()
        server.server_close()