from unittest import IsolatedAsyncioTestCase
from unittest.mock import MagicMock, AsyncMock, NonCallableMagicMock

from asyncio_taskpool import helpers


class HelpersTestCase(IsolatedAsyncioTestCase):

    async def test_execute_optional(self):
        f, args, kwargs = NonCallableMagicMock(), [1, 2], None
        a = [f, args, kwargs]  # to avoid IDE nagging
        self.assertIsNone(await helpers.execute_optional(*a))

        expected_output = 'foo'
        f = MagicMock(return_value=expected_output)
        output = await helpers.execute_optional(f, args, kwargs)
        self.assertEqual(expected_output, output)
        f.assert_called_once_with(*args)

        f.reset_mock()

        kwargs = {'a': 100, 'b': 200}
        output = await helpers.execute_optional(f, args, kwargs)
        self.assertEqual(expected_output, output)
        f.assert_called_once_with(*args, **kwargs)

        f = AsyncMock(return_value=expected_output)
        output = await helpers.execute_optional(f, args, kwargs)
        self.assertEqual(expected_output, output)
        f.assert_awaited_once_with(*args, **kwargs)

    def test_star_function(self):
        expected_output = 'bar'
        f = MagicMock(return_value=expected_output)
        a = (1, 2, 3)
        stars = 0
        output = helpers.star_function(f, a, stars)
        self.assertEqual(expected_output, output)
        f.assert_called_once_with(a)

        f.reset_mock()

        stars = 1
        output = helpers.star_function(f, a, stars)
        self.assertEqual(expected_output, output)
        f.assert_called_once_with(*a)

        f.reset_mock()

        a = {'a': 1, 'b': 2}
        stars = 2
        output = helpers.star_function(f, a, stars)
        self.assertEqual(expected_output, output)
        f.assert_called_once_with(**a)

        with self.assertRaises(ValueError):
            helpers.star_function(f, a, 3)
        with self.assertRaises(ValueError):
            helpers.star_function(f, a, -1)
        with self.assertRaises(ValueError):
            helpers.star_function(f, a, 123456789)

    async def test_join_queue(self):
        mock_join = AsyncMock()
        mock_queue = MagicMock(join=mock_join)
        self.assertIsNone(await helpers.join_queue(mock_queue))
        mock_join.assert_awaited_once_with()