import pytest
from fastapi.security import OAuth2PasswordRequestForm


@pytest.fixture
def create_oauth2_password_request_form():
    def _create_oauth2_password_request_form(username, password):
        return OAuth2PasswordRequestForm(username=username, password=password, scope="")

    return _create_oauth2_password_request_form


class TestAuthenticate:
    @pytest.mark.asyncio
    async def test_unknown_user(
        self, create_oauth2_password_request_form, mock_user_db
    ):
        form = create_oauth2_password_request_form("lancelot@camelot.bt", "guinevere")
        user = await mock_user_db.authenticate(form)
        assert user is None

    @pytest.mark.asyncio
    async def test_wrong_password(
        self, create_oauth2_password_request_form, mock_user_db
    ):
        form = create_oauth2_password_request_form("king.arthur@camelot.bt", "percival")
        user = await mock_user_db.authenticate(form)
        assert user is None

    @pytest.mark.asyncio
    async def test_valid_credentials(
        self, create_oauth2_password_request_form, mock_user_db
    ):
        form = create_oauth2_password_request_form(
            "king.arthur@camelot.bt", "guinevere"
        )
        user = await mock_user_db.authenticate(form)
        assert user is not None
        assert user.email == "king.arthur@camelot.bt"