"""Unit tests for plan/ist overlay (AP1.14)."""

from steering.graph.plan_ist import _ist_deviation_diff, _structural_diff


def test_structural_diff_detects_added_gate():
    baseline = {"items": [{"id": "a", "title": "A", "goal_description": "", "sort_order": 0}], "dependencies": [], "criteria": []}
    current = {
        "items": [
            {"id": "a", "title": "A", "goal_description": "", "sort_order": 0},
            {"id": "b", "title": "B", "goal_description": "", "sort_order": 1},
        ],
        "dependencies": [],
        "criteria": [],
    }
    diffs = _structural_diff(baseline, current)
    assert any(d["kind"] == "gate_added" and d["item_id"] == "b" for d in diffs)


def test_ist_deviation_detects_reached_gate():
    items = [{"id": "g1", "title": "Gate", "status": "reached"}]
    diffs = _ist_deviation_diff(items=items, criteria_by_item={"g1": []})
    assert any(d["kind"] == "ist_gate_status" for d in diffs)


def test_ist_deviation_detects_waived_criterion():
    items = [{"id": "g1", "title": "Gate", "status": "active"}]
    criteria = {
        "g1": [
            {"id": "c1", "title": "Kriterium", "status": "waived", "criterion_kind": "manual"}
        ]
    }
    diffs = _ist_deviation_diff(items=items, criteria_by_item=criteria)
    assert any(d["kind"] == "ist_criterion_waived" for d in diffs)