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#
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import unittest
from unittest.mock import Mock

from cassandra.cluster import _ConfigMode
from cassandra.cqlengine import connection
from cassandra.query import dict_factory


class ConnectionTest(unittest.TestCase):

    no_registered_connection_msg = "doesn't exist in the registry"

    def setUp(self):
        super(ConnectionTest, self).setUp()
        self.assertFalse(
            connection._connections,
            'Test precondition not met: connections are registered: {cs}'.format(cs=connection._connections)
        )

    def test_set_session_without_existing_connection(self):
        """
        Users can set the default session without having a default connection set.
        """
        mock_cluster = Mock(
            _config_mode=_ConfigMode.LEGACY,
        )
        mock_session = Mock(
            row_factory=dict_factory,
            encoder=Mock(mapping={}),
            cluster=mock_cluster,
        )
        connection.set_session(mock_session)

    def test_get_session_fails_without_existing_connection(self):
        """
        Users can't get the default session without having a default connection set.
        """
        with self.assertRaisesRegex(connection.CQLEngineException, self.no_registered_connection_msg):
            connection.get_session(connection=None)

    def test_get_cluster_fails_without_existing_connection(self):
        """
        Users can't get the default cluster without having a default connection set.
        """
        with self.assertRaisesRegex(connection.CQLEngineException, self.no_registered_connection_msg):
            connection.get_cluster(connection=None)