"""Graph-Validierung: DAG-Pflicht, Rück-Kanten nur von Gates, Skills vorhanden."""
import pytest
import yaml

from backend import config, engine, graph


def test_pipeline_yaml_valide():
    g = graph.laden(set(engine.WORKER))
    assert len(g.knoten) >= 20
    assert g.stufen == ["korpus", "inventar", "struktur", "guide", "montage"]
    for stufe in g.stufen[:-1]:
        assert g.gate_der_stufe(stufe) is not None


def _mit_kante(extra) -> None:
    daten = yaml.safe_load(config.PIPELINE_YAML.read_text())
    daten["kanten"].append(extra)
    import tempfile
    from pathlib import Path
    with tempfile.NamedTemporaryFile("w", suffix=".yaml", delete=False) as f:
        yaml.safe_dump(daten, f)
        pfad = Path(f.name)
    try:
        graph.laden(set(engine.WORKER), pfad=pfad)
    finally:
        pfad.unlink()
        graph.laden(set(engine.WORKER))  # Original wiederherstellen


def test_zyklus_wird_abgelehnt():
    with pytest.raises(graph.GraphFehler, match="Zyklus"):
        _mit_kante({"von": "montage", "nach": "recherche_plan", "art": "normal"})


def test_ruecklauf_nur_von_gates():
    with pytest.raises(graph.GraphFehler, match="nur von Gates"):
        _mit_kante({"von": "writer", "nach": "suche", "art": "ruecklauf"})


def test_layout_vollstaendig():
    lay = graph.get().layout()
    assert set(lay["knoten"]) == set(graph.get().knoten)
    assert all("spalte" in v and "zeile" in v for v in lay["knoten"].values())