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import unittest

from google.protobuf.any_pb2 import Any

from statefun.core import AnyStateHandle


def typed_any(type_url):
    any = Any()
    if type_url:
        any.type_url = type_url
    return any


def typed_any_bytes(type_url=None):
    return typed_any(type_url).SerializeToString()


class AnyHandleTestCase(unittest.TestCase):

    def test_example(self):
        handle = AnyStateHandle(typed_any_bytes("com/hello"))

        self.assertEqual(handle.value.type_url, "com/hello")

    def test_delete_handle(self):
        handle = AnyStateHandle(typed_any_bytes("com/hello"))

        del handle.value

        self.assertTrue(handle.value is None)

    def test_modify_handle(self):
        handle = AnyStateHandle(typed_any_bytes("com/hello"))

        handle.value = typed_any("com/world")

        self.assertEqual(handle.value.type_url, "com/world")

    def test_un_modified_bytes(self):
        handle = AnyStateHandle(typed_any_bytes("com/hello"))
        handle = AnyStateHandle(handle.bytes())

        self.assertEqual(handle.value.type_url, "com/hello")

    def test_modified_bytes(self):
        handle = AnyStateHandle(typed_any_bytes("com/hello"))

        handle.value = typed_any("com/world")
        handle = AnyStateHandle(handle.bytes())

        self.assertEqual(handle.value.type_url, "com/world")

    def test_missing_value(self):
        handle = AnyStateHandle(None)
        self.assertIsNone(handle.value)