"""Unit tests for the backend.routers.users module."""

from unittest.mock import ANY
from unittest.mock import AsyncMock
from unittest.mock import MagicMock
from unittest.mock import patch

import pytest
from fastapi.testclient import TestClient
from sqlalchemy.exc import NoResultFound
from sqlalchemy.exc import SQLAlchemyError

from backend.models import User
from backend.services.users import UserList


@pytest.mark.asyncio
@pytest.mark.parametrize("mock_logger", ["backend.routers.users"], indirect=True)
async def test_read_users_success(
    client: TestClient, sample_users: UserList, mock_logger: MagicMock
) -> None:
    """Test successful retrieval of all users via GET /users/.

    Verifies that the endpoint returns the expected list of users with a 200 status.
    """
    with patch("backend.routers.users.get_users", new=AsyncMock()) as mock_get_users:
        mock_get_users.return_value = sample_users

        response = client.get("/users/")

        assert response.status_code == 200
        assert response.json() == [
            {"email": "user1@example.com", "name": "User One"},
            {"email": "user2@example.com", "name": "User Two"},
        ]
        mock_get_users.assert_called_once()


@pytest.mark.asyncio
@pytest.mark.parametrize("mock_logger", ["backend.routers.users"], indirect=True)
async def test_read_users_empty(client: TestClient, mock_logger: MagicMock) -> None:
    """Test retrieval of users when none exist via GET /users/.

    Verifies that the endpoint returns an empty list with a 200 status.
    """
    with patch("backend.routers.users.get_users", new=AsyncMock()) as mock_get_users:
        mock_get_users.return_value = []

        response = client.get("/users/")

        assert response.status_code == 200
        assert response.json() == []
        mock_get_users.assert_called_once()


@pytest.mark.asyncio
@pytest.mark.parametrize("mock_logger", ["backend.routers.users"], indirect=True)
async def test_read_users_database_error(
    client: TestClient, mock_logger: MagicMock
) -> None:
    """Test handling of database errors in GET /users/.

    Verifies that the endpoint returns a 500 status on database failure.
    """
    with patch("backend.routers.users.get_users", new=AsyncMock()) as mock_get_users:
        mock_get_users.side_effect = SQLAlchemyError()

        response = client.get("/users/")

        assert response.status_code == 500
        assert "detail" in response.json()
        mock_get_users.assert_called_once()


@pytest.mark.asyncio
@pytest.mark.parametrize("mock_logger", ["backend.routers.users"], indirect=True)
@pytest.mark.parametrize(
    "email, expected_name",
    [
        ("user1@example.com", "User One"),
        ("user2@example.com", "User Two"),
    ],
    ids=["user1", "user2"],
)
async def test_read_user_success(
    client: TestClient, email: str, expected_name: str, mock_logger: MagicMock
) -> None:
    """Test successful retrieval of a user by email via GET /users/{email}.

    Verifies that the endpoint returns the correct user with a 200 status.
    """
    user = User(email=email, name=expected_name)
    with patch("backend.routers.users.get_user", new=AsyncMock()) as mock_get_user:
        mock_get_user.return_value = user

        response = client.get(f"/users/{email}")

        assert response.status_code == 200
        assert response.json() == {"email": email, "name": expected_name}
        mock_get_user.assert_called_once_with(ANY, email)


@pytest.mark.asyncio
@pytest.mark.parametrize("mock_logger", ["backend.routers.users"], indirect=True)
@pytest.mark.parametrize(
    "email",
    ["nonexistent@example.com", "invalid@domain.com"],
    ids=["nonexistent_email", "invalid_email"],
)
async def test_read_user_not_found(
    client: TestClient, email: str, mock_logger: MagicMock
) -> None:
    """Test handling of non-existent user in GET /users/{email}.

    Verifies that the endpoint returns a 404 status when the user is not found.
    """
    with patch("backend.routers.users.get_user", new=AsyncMock()) as mock_get_user:
        mock_get_user.side_effect = NoResultFound()

        response = client.get(f"/users/{email}")

        assert response.status_code == 404
        assert "detail" in response.json()
        mock_get_user.assert_called_once_with(ANY, email)


@pytest.mark.asyncio
@pytest.mark.parametrize("mock_logger", ["backend.routers.users"], indirect=True)
async def test_read_user_database_error(
    client: TestClient, mock_logger: MagicMock
) -> None:
    """Test handling of database errors in GET /users/{email}.

    Verifies that the endpoint returns a 500 status on database failure.
    """
    email = "user1@example.com"
    with patch("backend.routers.users.get_user", new=AsyncMock()) as mock_get_user:
        mock_get_user.side_effect = SQLAlchemyError()

        response = client.get(f"/users/{email}")

        assert response.status_code == 500
        assert "detail" in response.json()
        mock_get_user.assert_called_once_with(ANY, email)