"""Unit tests for execution graph engine (AP1.16b)."""

from steering.graph.execution_engine import (
    compute_execution_graph_state,
    compute_planning_debt,
    execution_waiting_to_attention_items,
    planning_debt_to_attention_items,
)


def _action(action_id: str, status: str = "open", **kwargs):
    return {
        "id": action_id,
        "status": status,
        "sort_order": kwargs.get("sort_order", 0),
        "title": kwargs.get("title", action_id),
        "action_kind": kwargs.get("action_kind", "delivery"),
        "roadmap_item_id": kwargs.get("roadmap_item_id"),
    }


def test_requires_blocks_until_predecessor_done():
    actions = [_action("b", "open"), _action("a", "open")]
    deps = [
        {
            "predecessor_action_id": "b",
            "successor_action_id": "a",
            "dependency_kind": "requires",
        }
    ]
    state = compute_execution_graph_state(actions=actions, dependencies=deps)
    assert state["items"]["a"]["blocked"] is True
    assert state["items"]["a"]["blocked_by"] == ["b"]
    assert "a" in state["blocked_actions"]
    assert "a" not in state["ready_actions"]

    actions[0]["status"] = "done"
    state = compute_execution_graph_state(actions=actions, dependencies=deps)
    assert state["items"]["a"]["ready"] is True
    assert "a" in state["ready_actions"]


def test_sequential_fallback_without_edges():
    actions = [
        _action("first", "open", sort_order=0),
        _action("second", "open", sort_order=1),
    ]
    state = compute_execution_graph_state(actions=actions, dependencies=[])
    assert state["items"]["first"]["ready"] is True
    assert state["items"]["second"]["blocked"] is True
    assert state["items"]["second"]["blocked_by"] == ["first"]

    actions[0]["status"] = "done"
    state = compute_execution_graph_state(actions=actions, dependencies=[])
    assert state["items"]["second"]["ready"] is True


def test_blocks_edge():
    actions = [_action("blocker", "in_progress"), _action("blocked", "open")]
    deps = [
        {
            "predecessor_action_id": "blocker",
            "successor_action_id": "blocked",
            "dependency_kind": "blocks",
        }
    ]
    state = compute_execution_graph_state(actions=actions, dependencies=deps)
    assert state["items"]["blocked"]["blocked"] is True

    actions[0]["status"] = "done"
    state = compute_execution_graph_state(actions=actions, dependencies=deps)
    assert state["items"]["blocked"]["ready"] is True


def test_critical_path():
    actions = [
        _action("a", "done", sort_order=0),
        _action("b", "open", sort_order=1),
        _action("c", "open", sort_order=2),
    ]
    deps = [
        {
            "predecessor_action_id": "a",
            "successor_action_id": "b",
            "dependency_kind": "requires",
        },
        {
            "predecessor_action_id": "b",
            "successor_action_id": "c",
            "dependency_kind": "requires",
        },
    ]
    state = compute_execution_graph_state(actions=actions, dependencies=deps)
    assert state["critical_path"] == ["a", "b", "c"]


def test_planning_debt_active_gate_without_actions():
    actions = [_action("x", roadmap_item_id="gate-2")]
    roadmap_items = [
        {"id": "gate-1", "status": "active", "title": "G5"},
        {"id": "gate-2", "status": "active", "title": "G6"},
    ]
    debts = compute_planning_debt(actions=actions, roadmap_items=roadmap_items)
    assert len(debts) == 1
    assert debts[0]["roadmap_item_id"] == "gate-1"


def test_scope_filters_to_gate():
    actions = [
        _action("a", roadmap_item_id="g1", sort_order=0),
        _action("b", roadmap_item_id="g2", sort_order=0),
    ]
    state = compute_execution_graph_state(
        actions=actions,
        dependencies=[],
        scope_roadmap_item_id="g1",
    )
    assert set(state["items"].keys()) == {"a"}


def test_planning_debt_attention_items():
    items = planning_debt_to_attention_items(
        initiative_id="init-1",
        debts=[
            {
                "roadmap_item_id": "gate-1",
                "title": "G5 Plan",
                "message": "Aktiver Zielzustand ohne Durchführungsplan",
            }
        ],
    )
    assert len(items) == 1
    assert items[0]["kind"] == "planning_debt"
    assert items[0]["initiative_id"] == "init-1"
    assert items[0]["milestone_id"] == "gate-1"


def test_execution_waiting_attention_items():
    actions = [
        _action("a", "open", sort_order=0),
        _action("b", "open", sort_order=1),
    ]
    state = compute_execution_graph_state(
        actions=actions,
        dependencies=[
            {
                "predecessor_action_id": "a",
                "successor_action_id": "b",
                "dependency_kind": "requires",
            }
        ],
    )
    items = execution_waiting_to_attention_items(
        initiative_id="init-1",
        actions=actions,
        graph_state=state,
    )
    assert len(items) == 1
    assert items[0]["kind"] == "execution_waiting"
    assert items[0]["action_id"] == "b"