"""Tests Vergleichs-Diffs (triviale ID-Tausche markieren, Rematch-Vorschläge)."""
from planning_exercise_path_builder import (
    _actionable_slot_diffs,
    _annotate_slot_diffs,
    _build_progression_compare_response,
    _build_progression_slot_diffs,
    _build_rematch_suggestion_diffs,
)


def test_annotate_trivial_id_swap():
    diffs = [
        {
            "roadmap_major_step_index": 1,
            "baseline_exercise_id": 10,
            "baseline_title": "Rhythmuswechsel in der Kumite-Beinarbeit",
            "proposed_exercise_id": 99,
            "proposed_title": "Rhythmuswechsel in der Kumite-Beinarbeit",
        }
    ]
    annotated = _annotate_slot_diffs(diffs)
    assert len(annotated) == 1
    assert annotated[0]["trivial_id_swap"] is True
    assert _actionable_slot_diffs(annotated) == []


def test_annotate_keeps_real_title_change():
    diffs = [
        {
            "roadmap_major_step_index": 1,
            "baseline_exercise_id": 10,
            "baseline_title": "Alt",
            "proposed_exercise_id": 99,
            "proposed_title": "Neu",
        }
    ]
    annotated = _annotate_slot_diffs(diffs)
    assert annotated[0]["trivial_id_swap"] is False
    assert len(_actionable_slot_diffs(annotated)) == 1


def test_build_slot_diffs_then_annotate():
    baseline = [
        {"roadmap_major_step_index": 0, "exercise_id": 1, "title": "A"},
        {"roadmap_major_step_index": 1, "exercise_id": 10, "title": "Gleich"},
    ]
    proposed = [
        {"roadmap_major_step_index": 0, "exercise_id": 1, "title": "A"},
        {"roadmap_major_step_index": 1, "exercise_id": 77, "title": "Gleich"},
    ]
    raw = _build_progression_slot_diffs(baseline, proposed)
    annotated = _annotate_slot_diffs(raw)
    assert len(annotated) == 1
    assert annotated[0]["trivial_id_swap"] is True
    assert _actionable_slot_diffs(annotated) == []


def test_rematch_suggestion_diffs_when_end_path_matches_baseline():
    baseline = [
        {"roadmap_major_step_index": 1, "exercise_id": None, "title": "Lernziel Slot 2"},
        {"roadmap_major_step_index": 4, "exercise_id": 50, "title": "Bestehend"},
    ]
    proposed = list(baseline)
    rematch_log = [
        {
            "roadmap_major_step_index": 1,
            "action": "replaced",
            "round": 1,
            "new_exercise_id": 101,
            "new_title": "Rhythmuswechsel in der Kumite-Beinarbeit",
            "replaced_exercise_id": None,
            "replaced_title": None,
        },
        {
            "roadmap_major_step_index": 1,
            "action": "replaced",
            "round": 3,
            "new_exercise_id": 102,
            "new_title": "Kumite Beinarbeit — vertiefung",
            "replaced_exercise_id": 101,
            "replaced_title": "Rhythmuswechsel in der Kumite-Beinarbeit",
        },
    ]
    diffs = _build_rematch_suggestion_diffs(baseline, rematch_log)
    assert len(diffs) == 1
    assert diffs[0]["proposed_exercise_id"] == 102
    assert diffs[0]["from_rematch_log"] is True

    compare = _build_progression_compare_response(
        {"steps": baseline, "path_qa": {"overall_ok": True, "quality_score": 0.88}},
        {
            "steps": proposed,
            "path_qa": {
                "overall_ok": False,
                "quality_score": 0.65,
                "rematch_log": rematch_log,
            },
        },
    )
    assert compare["slot_diffs_source"] == "rematch_log"
    assert compare["slot_diff_count"] == 1
    assert compare["proposed_steps"][0]["exercise_id"] == 102