"""Tests Vergleichs-Diffs (triviale ID-Tausche ausfiltern)."""
from planning_exercise_path_builder import (
    _build_progression_slot_diffs,
    _filter_trivial_slot_diffs,
)


def test_filter_trivial_slot_diffs_same_title_different_id():
    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",
        }
    ]
    assert _filter_trivial_slot_diffs(diffs) == []


def test_filter_trivial_slot_diffs_keeps_real_title_change():
    diffs = [
        {
            "roadmap_major_step_index": 1,
            "baseline_exercise_id": 10,
            "baseline_title": "Alt",
            "proposed_exercise_id": 99,
            "proposed_title": "Neu",
        }
    ]
    filtered = _filter_trivial_slot_diffs(diffs)
    assert len(filtered) == 1
    assert filtered[0]["proposed_title"] == "Neu"


def test_build_slot_diffs_then_filter():
    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)
    assert len(raw) == 1
    assert _filter_trivial_slot_diffs(raw) == []