from __future__ import annotations

import importlib.util
import sys
from pathlib import Path


def _load_tree_module():
    path = Path(__file__).resolve().parent.parent / "scripts" / "two_user_flow_tree.py"
    spec = importlib.util.spec_from_file_location("two_user_flow_tree", path)
    assert spec and spec.loader
    mod = importlib.util.module_from_spec(spec)
    sys.modules[spec.name] = mod
    spec.loader.exec_module(mod)
    return mod


def test_two_user_flow_tree_smoke(tmp_path: Path) -> None:
    mod = _load_tree_module()

    report = mod.run_simulation(
        max_depth=1,
        workdir=tmp_path / "tree",
        seed_plays_per_user=50,
        check_recommendations=True,
    )

    assert report["checked_edges"] >= 18
    assert report["seed_plays_per_user"] == 50
    assert report["check_recommendations"] is True
    assert report["unique_states"] >= 10
    assert any(edge["expected_ok"] is False and edge["actual_ok"] is False for edge in report["edges"])
    assert all(edge["invariants_ok"] for edge in report["edges"])