"""Тесты M3: дерево подзадач (родитель, циклы) и карточка проекта."""

from fastapi.testclient import TestClient


def test_create_subtask(client: TestClient) -> None:
    parent = client.post("/api/tasks", json={"title": "Ремонт балкона"}).json()["id"]
    child = client.post(
        "/api/tasks", json={"title": "Купить краску", "parent_task_id": parent}
    ).json()["id"]

    task = client.get(f"/api/tasks/{child}").json()
    assert task["parent_task_id"] == parent

    root = client.get(f"/api/tasks/{parent}").json()
    assert root["parent_task_id"] is None


def test_subtask_of_unknown_parent_rejected(client: TestClient) -> None:
    resp = client.post("/api/tasks", json={"title": "x", "parent_task_id": 999})
    assert resp.status_code == 400


def test_task_cannot_be_own_parent(client: TestClient) -> None:
    task_id = client.post("/api/tasks", json={"title": "x"}).json()["id"]
    resp = client.patch(f"/api/tasks/{task_id}", json={"parent_task_id": task_id})
    assert resp.status_code == 400


def test_cycle_rejected_on_reparent(client: TestClient) -> None:
    a = client.post("/api/tasks", json={"title": "A"}).json()["id"]
    b = client.post("/api/tasks", json={"title": "B", "parent_task_id": a}).json()["id"]
    c = client.post("/api/tasks", json={"title": "C", "parent_task_id": b}).json()["id"]

    # c → a создало бы цикл a → b → c → a
    assert client.patch(f"/api/tasks/{a}", json={"parent_task_id": c}).status_code == 400

    # валидный перенос: c → a
    moved = client.patch(f"/api/tasks/{c}", json={"parent_task_id": a}).json()
    assert moved["parent_task_id"] == a


def test_detach_from_parent(client: TestClient) -> None:
    parent = client.post("/api/tasks", json={"title": "P"}).json()["id"]
    child_id = client.post(
        "/api/tasks", json={"title": "C", "parent_task_id": parent}
    ).json()["id"]
    detached = client.patch(f"/api/tasks/{child_id}", json={"parent_task_id": None}).json()
    assert detached["parent_task_id"] is None


def test_get_single_project(client: TestClient) -> None:
    pid = client.post(
        "/api/projects", json={"name": "Дача", "note": "Ссылки: [форум](https://example.com)"}
    ).json()["id"]
    project = client.get(f"/api/projects/{pid}").json()
    assert project["name"] == "Дача"
    assert "форум" in project["note"]
    assert client.get("/api/projects/999").status_code == 404


def test_project_note_update(client: TestClient) -> None:
    pid = client.post("/api/projects", json={"name": "Проект"}).json()["id"]
    updated = client.patch(
        f"/api/projects/{pid}",
        json={"note": "- задача 1\n- задача 2", "relevance_status": "paused"},
    ).json()
    assert updated["note"].startswith("- задача 1")
    assert updated["relevance_status"] == "paused"