from distutils.version import StrictVersion
from unittest.mock import Mock
import pytest
import redis

_REDIS_VERSIONS = {}


def get_version(**kwargs):
    params = {'host': 'localhost', 'port': 6379, 'db': 9}
    params.update(kwargs)
    key = '%s:%s' % (params['host'], params['port'])
    if key not in _REDIS_VERSIONS:
        client = redis.StrictRedis(**params)
        _REDIS_VERSIONS[key] = client.info()['redis_version']
        client.connection_pool.disconnect()
    return _REDIS_VERSIONS[key]


def _get_client(cls, request=None, **kwargs):
    params = {'host': 'localhost', 'port': 6379, 'db': 9}
    params.update(kwargs)
    client = cls(**params)
    client.flushdb()
    if request:

        def teardown():
            # client.flushdb()
            client.connection_pool.disconnect()

        request.addfinalizer(teardown)
    return client


def skip_if_server_version_lt(min_version):
    check = StrictVersion(get_version()) < StrictVersion(min_version)
    return pytest.mark.skipif(check, reason="")


def skip_if_server_version_gte(min_version):
    check = StrictVersion(get_version()) >= StrictVersion(min_version)
    return pytest.mark.skipif(check, reason="")


def _gen_cluster_mock_resp(r, response):
    mock_connection_pool = Mock()
    connection = Mock()
    response = response
    connection.read_response.return_value = response
    mock_connection_pool.get_connection.return_value = connection
    r.connection_pool = mock_connection_pool
    return r


@pytest.fixture()
def mock_cluster_resp_ok(request, **kwargs):
    r = _get_client(redis.Redis, request, **kwargs)
    return _gen_cluster_mock_resp(r, 'OK')


@pytest.fixture()
def mock_cluster_resp_int(request, **kwargs):
    r = _get_client(redis.Redis, request, **kwargs)
    return _gen_cluster_mock_resp(r, '2')


@pytest.fixture()
def mock_cluster_resp_info(request, **kwargs):
    r = _get_client(redis.Redis, request, **kwargs)
    response = ('cluster_state:ok\r\ncluster_slots_assigned:16384\r\n'
                'cluster_slots_ok:16384\r\ncluster_slots_pfail:0\r\n'
                'cluster_slots_fail:0\r\ncluster_known_nodes:7\r\n'
                'cluster_size:3\r\ncluster_current_epoch:7\r\n'
                'cluster_my_epoch:2\r\ncluster_stats_messages_sent:170262\r\n'
                'cluster_stats_messages_received:105653\r\n')
    return _gen_cluster_mock_resp(r, response)


@pytest.fixture()
def mock_cluster_resp_nodes(request, **kwargs):
    r = _get_client(redis.Redis, request, **kwargs)
    response = ('c8253bae761cb1ecb2b61857d85dfe455a0fec8b 172.17.0.7:7006 '
                'slave aa90da731f673a99617dfe930306549a09f83a6b 0 '
                '1447836263059 5 connected\n'
                '9bd595fe4821a0e8d6b99d70faa660638a7612b3 172.17.0.7:7008 '
                'master - 0 1447836264065 0 connected\n'
                'aa90da731f673a99617dfe930306549a09f83a6b 172.17.0.7:7003 '
                'myself,master - 0 0 2 connected 5461-10922\n'
                '1df047e5a594f945d82fc140be97a1452bcbf93e 172.17.0.7:7007 '
                'slave 19efe5a631f3296fdf21a5441680f893e8cc96ec 0 '
                '1447836262556 3 connected\n'
                '4ad9a12e63e8f0207025eeba2354bcf4c85e5b22 172.17.0.7:7005 '
                'master - 0 1447836262555 7 connected 0-5460\n'
                '19efe5a631f3296fdf21a5441680f893e8cc96ec 172.17.0.7:7004 '
                'master - 0 1447836263562 3 connected 10923-16383\n'
                'fbb23ed8cfa23f17eaf27ff7d0c410492a1093d6 172.17.0.7:7002 '
                'master,fail - 1447829446956 1447829444948 1 disconnected\n'
                )
    return _gen_cluster_mock_resp(r, response)


@pytest.fixture()
def mock_cluster_resp_slaves(request, **kwargs):
    r = _get_client(redis.Redis, request, **kwargs)
    response = ("['1df047e5a594f945d82fc140be97a1452bcbf93e 172.17.0.7:7007 "
                "slave 19efe5a631f3296fdf21a5441680f893e8cc96ec 0 "
                "1447836789290 3 connected']")
    return _gen_cluster_mock_resp(r, response)

