from __future__ import annotations

from datetime import UTC, datetime, timedelta
from uuid import uuid4

from fastapi.testclient import TestClient

from app.api.tasks import get_task_repository
from app.main import app
from app.storage import JsonFileTaskRepository, StoredTask


def make_repo(tmp_path) -> JsonFileTaskRepository:
    return JsonFileTaskRepository(tmp_path / "tasks.json")


def make_task(
    *,
    title: str = "Task",
    started: bool = False,
    done: bool = False,
) -> StoredTask:
    now = datetime.now(UTC)
    started_at = now - timedelta(minutes=10) if started else None
    done_at = now - timedelta(minutes=1) if done else None
    return StoredTask(
        id=uuid4(),
        title=title,
        created_at=now - timedelta(hours=1),
        started_at=started_at,
        done_at=done_at,
    )


def make_client(tmp_path) -> tuple[TestClient, JsonFileTaskRepository]:
    repo = make_repo(tmp_path)
    app.dependency_overrides[get_task_repository] = lambda: repo
    client = TestClient(app)
    return client, repo


def teardown_function() -> None:
    app.dependency_overrides.clear()


def test_ui_data_board_returns_lightweight_grouped_lists(tmp_path):
    client, repo = make_client(tmp_path)
    backlog = make_task(title="Backlog title")
    in_progress = make_task(title="In progress title", started=True)
    done = make_task(title="Done title", started=True, done=True)
    repo.create_task(backlog)
    repo.create_task(in_progress)
    repo.create_task(done)

    response = client.get("/ui_data/stats/board")

    assert response.status_code == 200
    data = response.json()
    assert [item["title"] for item in data["backlog_tasks"]] == ["Backlog title"]
    assert [item["title"] for item in data["in_progress_tasks"]] == ["In progress title"]
    assert [item["title"] for item in data["done_tasks"]] == ["Done title"]
    assert data["backlog_tasks"][0]["display_date_label"] == "Created"
    assert data["in_progress_tasks"][0]["display_date_label"] == "Started"
    assert data["done_tasks"][0]["display_date_label"] == "Done"
    assert "created_at" not in data["backlog_tasks"][0]
    assert "started_at" not in data["in_progress_tasks"][0]
    assert "done_at" not in data["done_tasks"][0]
    assert "cycle_time" not in data["done_tasks"][0]


def test_ui_data_task_details_returns_full_selected_task_data(tmp_path):
    client, repo = make_client(tmp_path)
    task = make_task(title="Detailed task", started=True, done=True)
    repo.create_task(task)

    response = client.get(f"/ui_data/tasks/{task.id}")

    assert response.status_code == 200
    data = response.json()
    assert data["id"] == str(task.id)
    assert data["title"] == "Detailed task"
    assert data["status"] == "done"
    assert datetime.fromisoformat(data["created_at"].replace("Z", "+00:00")) == task.created_at
    assert datetime.fromisoformat(data["started_at"].replace("Z", "+00:00")) == task.started_at
    assert datetime.fromisoformat(data["done_at"].replace("Z", "+00:00")) == task.done_at
    assert data["cycle_time"].startswith("0h 9m")


def test_ui_data_task_details_rejects_invalid_uuid(tmp_path):
    client, _repo = make_client(tmp_path)

    response = client.get("/ui_data/tasks/bad-id")

    assert response.status_code == 400
    assert response.json() == {
        "error": "invalid_id",
        "message": "Task id must be a valid UUID",
    }


def test_ui_data_task_details_returns_not_found_for_missing_task(tmp_path):
    client, _repo = make_client(tmp_path)

    response = client.get(f"/ui_data/tasks/{uuid4()}")

    assert response.status_code == 404
    assert response.json() == {
        "error": "invalid_id",
        "message": "Task was not found",
    }


def test_ui_data_routes_are_hidden_from_openapi_schema(tmp_path):
    client, _repo = make_client(tmp_path)

    response = client.get("/openapi.json")

    assert response.status_code == 200
    paths = response.json()["paths"]
    assert "/ui_data/stats/board" not in paths
    assert "/ui_data/tasks/{task_id}" not in paths