from __future__ import absolute_import

from mock import MagicMock, Mock, patch, sentinel
from nose import SkipTest

from celery.backends import couchbase as module
from celery.backends.couchbase import CouchBaseBackend
from celery.exceptions import ImproperlyConfigured
from celery import backends
from celery.tests.case import AppCase

try:
    import couchbase
except ImportError:
    couchbase = None  # noqa

COUCHBASE_BUCKET = 'celery_bucket'


class test_CouchBaseBackend(AppCase):

    def setup(self):
        if couchbase is None:
            raise SkipTest('couchbase is not installed.')
        self.backend = CouchBaseBackend(app=self.app)

    def test_init_no_couchbase(self):
        """test init no couchbase raises"""
        prev, module.couchbase = module.couchbase, None
        try:
            with self.assertRaises(ImproperlyConfigured):
                CouchBaseBackend(app=self.app)
        finally:
            module.couchbase = prev

    def test_init_no_settings(self):
        """test init no settings"""
        self.app.conf.CELERY_COUCHBASE_BACKEND_SETTINGS = []
        with self.assertRaises(ImproperlyConfigured):
            CouchBaseBackend(app=self.app)

    def test_init_settings_is_None(self):
        """Test init settings is None"""
        self.app.conf.CELERY_COUCHBASE_BACKEND_SETTINGS = None
        CouchBaseBackend(app=self.app)

    def test_get_connection_connection_exists(self):
        with patch('couchbase.connection.Connection') as mock_Connection:
            self.backend._connection = sentinel._connection

            connection = self.backend._get_connection()

            self.assertEqual(sentinel._connection, connection)
            self.assertFalse(mock_Connection.called)

    def test_get(self):
        """test_get

        CouchBaseBackend.get should return  and take two params
        db conn to couchbase is mocked.
        TODO Should test on key not exists

        """
        self.app.conf.CELERY_COUCHBASE_BACKEND_SETTINGS = {}
        x = CouchBaseBackend(app=self.app)
        x._connection = Mock()
        mocked_get = x._connection.get = Mock()
        mocked_get.return_value.value = sentinel.retval
        # should return None
        self.assertEqual(x.get('1f3fab'), sentinel.retval)
        x._connection.get.assert_called_once_with('1f3fab')

    def test_set(self):
        """test_set

        CouchBaseBackend.set should return None and take two params
        db conn to couchbase is mocked.

        """
        self.app.conf.CELERY_COUCHBASE_BACKEND_SETTINGS = None
        x = CouchBaseBackend(app=self.app)
        x._connection = MagicMock()
        x._connection.set = MagicMock()
        # should return None
        self.assertIsNone(x.set(sentinel.key, sentinel.value))

    def test_delete(self):
        """test_delete

        CouchBaseBackend.delete should return and take two params
        db conn to couchbase is mocked.
        TODO Should test on key not exists

        """
        self.app.conf.CELERY_COUCHBASE_BACKEND_SETTINGS = {}
        x = CouchBaseBackend(app=self.app)
        x._connection = Mock()
        mocked_delete = x._connection.delete = Mock()
        mocked_delete.return_value = None
        # should return None
        self.assertIsNone(x.delete('1f3fab'))
        x._connection.delete.assert_called_once_with('1f3fab')

    def test_config_params(self):
        """test_config_params

        celery.conf.CELERY_COUCHBASE_BACKEND_SETTINGS is properly set
        """
        self.app.conf.CELERY_COUCHBASE_BACKEND_SETTINGS = {
            'bucket': 'mycoolbucket',
            'host': ['here.host.com', 'there.host.com'],
            'username': 'johndoe',
            'password': 'mysecret',
            'port': '1234',
        }
        x = CouchBaseBackend(app=self.app)
        self.assertEqual(x.bucket, 'mycoolbucket')
        self.assertEqual(x.host, ['here.host.com', 'there.host.com'],)
        self.assertEqual(x.username, 'johndoe',)
        self.assertEqual(x.password, 'mysecret')
        self.assertEqual(x.port, 1234)

    def test_backend_by_url(self, url='couchbase://myhost/mycoolbucket'):
        from celery.backends.couchbase import CouchBaseBackend
        backend, url_ = backends.get_backend_by_url(url, self.app.loader)
        self.assertIs(backend, CouchBaseBackend)
        self.assertEqual(url_, url)

    def test_backend_params_by_url(self):
        url = 'couchbase://johndoe:mysecret@myhost:123/mycoolbucket'
        with self.Celery(backend=url) as app:
            x = app.backend
            self.assertEqual(x.bucket, "mycoolbucket")
            self.assertEqual(x.host, "myhost")
            self.assertEqual(x.username, "johndoe")
            self.assertEqual(x.password, "mysecret")
            self.assertEqual(x.port, 123)