import datetime
import json
import psycopg2
import unittest
import socket

from mock import Mock, PropertyMock, patch
from patroni.api import RestApiHandler, RestApiServer
from patroni.dcs import ClusterConfig, Member
from patroni.ha import _MemberStatus
from patroni.utils import tzutc
from six import BytesIO as IO
from six.moves import BaseHTTPServer
from . import psycopg2_connect, MockCursor


future_restart_time = datetime.datetime.now(tzutc) + datetime.timedelta(days=5)
postmaster_start_time = datetime.datetime.now(tzutc)


class MockPostgresql(object):

    name = 'test'
    state = 'running'
    role = 'master'
    server_version = '999999'
    sysid = 'dummysysid'
    scope = 'dummy'
    pending_restart = True
    wal_name = 'wal'
    lsn_name = 'lsn'

    @staticmethod
    def connection():
        return psycopg2_connect()

    @staticmethod
    def postmaster_start_time():
        return str(postmaster_start_time)

    @staticmethod
    def replica_cached_timeline(_):
        return 2


class MockWatchdog(object):
    is_healthy = False


class MockHa(object):

    state_handler = MockPostgresql()
    watchdog = MockWatchdog()

    @staticmethod
    def is_leader():
        return False

    @staticmethod
    def reinitialize(_):
        return 'reinitialize'

    @staticmethod
    def restart(*args, **kwargs):
        return (True, '')

    @staticmethod
    def restart_scheduled():
        return False

    @staticmethod
    def delete_future_restart():
        return True

    @staticmethod
    def fetch_nodes_statuses(members):
        return [_MemberStatus(None, True, None, 0, None, {}, False)]

    @staticmethod
    def schedule_future_restart(data):
        return True

    @staticmethod
    def is_lagging(wal):
        return False

    @staticmethod
    def get_effective_tags():
        return {'nosync': True}

    @staticmethod
    def wakeup():
        pass

    @staticmethod
    def is_paused():
        return True

    @staticmethod
    def is_standby_cluster():
        return False


class MockLogger(object):

    NORMAL_LOG_QUEUE_SIZE = 2
    queue_size = 3
    records_lost = 1


class MockPatroni(object):

    ha = MockHa()
    config = Mock()
    postgresql = ha.state_handler
    dcs = Mock()
    logger = MockLogger()
    tags = {}
    version = '0.00'
    noloadbalance = PropertyMock(return_value=False)
    scheduled_restart = {'schedule': future_restart_time,
                         'postmaster_start_time': postgresql.postmaster_start_time()}

    @staticmethod
    def sighup_handler():
        pass


class MockRequest(object):

    def __init__(self, request):
        self.request = request.encode('utf-8')

    def makefile(self, *args, **kwargs):
        return IO(self.request)

    def sendall(self, *args, **kwargs):
        pass


class MockRestApiServer(RestApiServer):

    def __init__(self, Handler, request, config=None):
        self.socket = 0
        self.serve_forever = Mock()
        MockRestApiServer._BaseServer__is_shut_down = Mock()
        MockRestApiServer._BaseServer__shutdown_request = True
        config = config or {'listen': '127.0.0.1:8008', 'auth': 'test:test', 'certfile': 'dumb'}
        super(MockRestApiServer, self).__init__(MockPatroni(), config)
        Handler(MockRequest(request), ('0.0.0.0', 8080), self)


@patch('ssl.SSLContext.load_cert_chain', Mock())
@patch('ssl.SSLContext.wrap_socket', Mock(return_value=0))
@patch.object(BaseHTTPServer.HTTPServer, '__init__', Mock())
class TestRestApiHandler(unittest.TestCase):

    _authorization = '\nAuthorization: Basic dGVzdDp0ZXN0'

    def test_do_GET(self):
        MockRestApiServer(RestApiHandler, 'GET /replica')
        with patch.object(RestApiHandler, 'get_postgresql_status', Mock(return_value={})):
            MockRestApiServer(RestApiHandler, 'GET /replica')
        with patch.object(RestApiHandler, 'get_postgresql_status', Mock(return_value={'role': 'master'})):
            MockRestApiServer(RestApiHandler, 'GET /replica')
        with patch.object(RestApiHandler, 'get_postgresql_status', Mock(return_value={'state': 'running'})):
            MockRestApiServer(RestApiHandler, 'GET /health')
        MockRestApiServer(RestApiHandler, 'GET /master')
        MockPatroni.dcs.cluster.sync.sync_standby = MockPostgresql.name
        MockPatroni.dcs.cluster.is_synchronous_mode = Mock(return_value=True)
        with patch.object(RestApiHandler, 'get_postgresql_status', Mock(return_value={'role': 'replica'})):
            MockRestApiServer(RestApiHandler, 'GET /synchronous')
        with patch.object(RestApiHandler, 'get_postgresql_status', Mock(return_value={'role': 'replica'})):
            MockPatroni.dcs.cluster.sync.sync_standby = ''
            MockRestApiServer(RestApiHandler, 'GET /asynchronous')
        MockPatroni.ha.is_leader = Mock(return_value=True)
        MockRestApiServer(RestApiHandler, 'GET /replica')
        MockPatroni.dcs.cluster = None
        with patch.object(RestApiHandler, 'get_postgresql_status', Mock(return_value={'role': 'master'})):
            MockRestApiServer(RestApiHandler, 'GET /master')
        with patch.object(MockHa, 'restart_scheduled', Mock(return_value=True)):
            MockRestApiServer(RestApiHandler, 'GET /master')
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'GET /master'))
        with patch.object(RestApiServer, 'query', Mock(return_value=[('', 1, '', '', '', '', False, '')])):
            self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'GET /patroni'))
        with patch.object(MockHa, 'is_standby_cluster', Mock(return_value=True)):
            MockRestApiServer(RestApiHandler, 'GET /standby_leader')

    def test_do_OPTIONS(self):
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'OPTIONS / HTTP/1.0'))

    @patch.object(MockPostgresql, 'state', PropertyMock(return_value='stopped'))
    def test_do_GET_patroni(self):
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'GET /patroni'))

    def test_basicauth(self):
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'POST /restart HTTP/1.0'))
        MockRestApiServer(RestApiHandler, 'POST /restart HTTP/1.0\nAuthorization:')

    @patch.object(MockPatroni, 'dcs')
    def test_do_GET_config(self, mock_dcs):
        mock_dcs.cluster.config.data = {}
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'GET /config'))
        mock_dcs.cluster.config = None
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'GET /config'))

    @patch.object(MockPatroni, 'dcs')
    def test_do_PATCH_config(self, mock_dcs):
        config = {'postgresql': {'use_slots': False, 'use_pg_rewind': True, 'parameters': {'wal_level': 'logical'}}}
        mock_dcs.get_cluster.return_value.config = ClusterConfig.from_node(1, json.dumps(config))
        request = 'PATCH /config HTTP/1.0' + self._authorization
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, request))
        request += '\nContent-Length: '
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, request + '34\n\n{"postgresql":{"use_slots":false}}'))
        config['ttl'] = 5
        config['postgresql'].update({'use_slots': {'foo': True}, "parameters": None})
        config = json.dumps(config)
        request += str(len(config)) + '\n\n' + config
        MockRestApiServer(RestApiHandler, request)
        mock_dcs.set_config_value.return_value = False
        MockRestApiServer(RestApiHandler, request)

    @patch.object(MockPatroni, 'dcs')
    def test_do_PUT_config(self, mock_dcs):
        mock_dcs.get_cluster.return_value.config = ClusterConfig.from_node(1, '{}')
        request = 'PUT /config HTTP/1.0' + self._authorization + '\nContent-Length: '
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, request + '2\n\n{}'))
        config = '{"foo": "bar"}'
        request += str(len(config)) + '\n\n' + config
        MockRestApiServer(RestApiHandler, request)
        mock_dcs.set_config_value.return_value = False
        MockRestApiServer(RestApiHandler, request)
        mock_dcs.get_cluster.return_value.config = ClusterConfig.from_node(1, config)
        MockRestApiServer(RestApiHandler, request)

    @patch.object(MockPatroni, 'sighup_handler', Mock(side_effect=Exception))
    def test_do_POST_reload(self):
        with patch.object(MockPatroni, 'config') as mock_config:
            mock_config.reload_local_configuration.return_value = False
            MockRestApiServer(RestApiHandler, 'POST /reload HTTP/1.0' + self._authorization)
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'POST /reload HTTP/1.0' + self._authorization))

    @patch.object(MockPatroni, 'dcs')
    def test_do_POST_restart(self, mock_dcs):
        mock_dcs.get_cluster.return_value.is_paused.return_value = False
        request = 'POST /restart HTTP/1.0' + self._authorization
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, request))

        with patch.object(MockHa, 'restart', Mock(side_effect=Exception)):
            MockRestApiServer(RestApiHandler, request)

        post = request + '\nContent-Length: '

        def make_request(request=None, **kwargs):
            request = json.dumps(kwargs) if request is None else request
            return '{0}{1}\n\n{2}'.format(post, len(request), request)

        # empty request
        request = make_request('')
        MockRestApiServer(RestApiHandler, request)
        # invalid request
        request = make_request('foobar=baz')
        MockRestApiServer(RestApiHandler, request)
        # wrong role
        request = make_request(schedule=future_restart_time.isoformat(), role='unknown', postgres_version='9.5.3')
        MockRestApiServer(RestApiHandler, request)
        # wrong version
        request = make_request(schedule=future_restart_time.isoformat(), role='master', postgres_version='9.5.3.1')
        MockRestApiServer(RestApiHandler, request)
        # unknown filter
        request = make_request(schedule=future_restart_time.isoformat(), batman='lives')
        MockRestApiServer(RestApiHandler, request)
        # incorrect schedule
        request = make_request(schedule='2016-08-42 12:45TZ+1', role='master')
        MockRestApiServer(RestApiHandler, request)
        # everything fine, but the schedule is missing
        request = make_request(role='master', postgres_version='9.5.2')
        MockRestApiServer(RestApiHandler, request)
        for retval in (True, False):
            with patch.object(MockHa, 'schedule_future_restart', Mock(return_value=retval)):
                request = make_request(schedule=future_restart_time.isoformat())
                MockRestApiServer(RestApiHandler, request)
            with patch.object(MockHa, 'restart', Mock(return_value=(retval, "foo"))):
                request = make_request(role='master', postgres_version='9.5.2')
                MockRestApiServer(RestApiHandler, request)

        mock_dcs.get_cluster.return_value.is_paused.return_value = True
        MockRestApiServer(RestApiHandler, make_request(schedule='2016-08-42 12:45TZ+1', role='master'))
        # Valid timeout
        MockRestApiServer(RestApiHandler, make_request(timeout='60s'))
        # Invalid timeout
        MockRestApiServer(RestApiHandler, make_request(timeout='42towels'))

    def test_do_DELETE_restart(self):
        for retval in (True, False):
            with patch.object(MockHa, 'delete_future_restart', Mock(return_value=retval)):
                request = 'DELETE /restart HTTP/1.0' + self._authorization
                self.assertIsNotNone(MockRestApiServer(RestApiHandler, request))

    @patch.object(MockPatroni, 'dcs')
    def test_do_POST_reinitialize(self, mock_dcs):
        cluster = mock_dcs.get_cluster.return_value
        cluster.is_paused.return_value = False
        request = 'POST /reinitialize HTTP/1.0' + self._authorization + '\nContent-Length: 15\n\n{"force": true}'
        MockRestApiServer(RestApiHandler, request)
        with patch.object(MockHa, 'reinitialize', Mock(return_value=None)):
            MockRestApiServer(RestApiHandler, request)

    @patch('time.sleep', Mock())
    def test_RestApiServer_query(self):
        with patch.object(MockCursor, 'execute', Mock(side_effect=psycopg2.OperationalError)):
            self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'GET /patroni'))
        with patch.object(MockPostgresql, 'connection', Mock(side_effect=psycopg2.OperationalError)):
            self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'GET /patroni'))

    @patch('time.sleep', Mock())
    @patch.object(MockPatroni, 'dcs')
    def test_do_POST_switchover(self, dcs):
        dcs.loop_wait = 10
        cluster = dcs.get_cluster.return_value
        cluster.is_synchronous_mode.return_value = False
        cluster.is_paused.return_value = False

        post = 'POST /switchover HTTP/1.0' + self._authorization + '\nContent-Length: '

        MockRestApiServer(RestApiHandler, post + '7\n\n{"1":2}')

        request = post + '0\n\n'
        MockRestApiServer(RestApiHandler, request)

        cluster.leader.name = 'postgresql1'
        MockRestApiServer(RestApiHandler, request)

        request = post + '25\n\n{"leader": "postgresql1"}'

        cluster.is_paused.return_value = True
        MockRestApiServer(RestApiHandler, request)

        cluster.is_paused.return_value = False
        for cluster.is_synchronous_mode.return_value in (True, False):
            MockRestApiServer(RestApiHandler, request)

        cluster.leader.name = 'postgresql2'
        request = post + '53\n\n{"leader": "postgresql1", "candidate": "postgresql2"}'
        MockRestApiServer(RestApiHandler, request)

        cluster.leader.name = 'postgresql1'
        for cluster.is_synchronous_mode.return_value in (True, False):
            MockRestApiServer(RestApiHandler, request)

        cluster.members = [Member(0, 'postgresql0', 30, {'api_url': 'http'}),
                           Member(0, 'postgresql2', 30, {'api_url': 'http'})]
        MockRestApiServer(RestApiHandler, request)

        cluster.failover = None
        MockRestApiServer(RestApiHandler, request)

        dcs.get_cluster.side_effect = [cluster]
        MockRestApiServer(RestApiHandler, request)

        cluster2 = cluster.copy()
        cluster2.leader.name = 'postgresql0'
        cluster2.is_unlocked.return_value = False
        dcs.get_cluster.side_effect = [cluster, cluster2]
        MockRestApiServer(RestApiHandler, request)

        cluster2.leader.name = 'postgresql2'
        dcs.get_cluster.side_effect = [cluster, cluster2]
        MockRestApiServer(RestApiHandler, request)

        dcs.get_cluster.side_effect = None
        dcs.manual_failover.return_value = False
        MockRestApiServer(RestApiHandler, request)
        dcs.manual_failover.return_value = True

        with patch.object(MockHa, 'fetch_nodes_statuses', Mock(return_value=[])):
            MockRestApiServer(RestApiHandler, request)

        # Valid future date
        request = post + '103\n\n{"leader": "postgresql1", "member": "postgresql2",' +\
                         ' "scheduled_at": "6016-02-15T18:13:30.568224+01:00"}'
        MockRestApiServer(RestApiHandler, request)
        with patch.object(MockPatroni, 'dcs') as d:
            d.manual_failover.return_value = False
            MockRestApiServer(RestApiHandler, request)

        # Exception: No timezone specified
        request = post + '97\n\n{"leader": "postgresql1", "member": "postgresql2",' +\
                         ' "scheduled_at": "6016-02-15T18:13:30.568224"}'
        MockRestApiServer(RestApiHandler, request)

        # Exception: Scheduled in the past
        request = post + '103\n\n{"leader": "postgresql1", "member": "postgresql2", "scheduled_at": "'
        MockRestApiServer(RestApiHandler, request + '1016-02-15T18:13:30.568224+01:00"}')

        # Invalid date
        self.assertIsNotNone(MockRestApiServer(RestApiHandler, request + '2010-02-29T18:13:30.568224+01:00"}'))

    @patch.object(MockPatroni, 'dcs', Mock())
    def test_do_POST_failover(self):
        post = 'POST /failover HTTP/1.0' + self._authorization + '\nContent-Length: '
        MockRestApiServer(RestApiHandler, post + '14\n\n{"leader":"1"}')
        MockRestApiServer(RestApiHandler, post + '37\n\n{"candidate":"2","scheduled_at": "1"}')


@patch('ssl.SSLContext.load_cert_chain', Mock())
@patch('ssl.SSLContext.wrap_socket', Mock(return_value=0))
@patch.object(BaseHTTPServer.HTTPServer, '__init__', Mock())
class TestRestApiServer(unittest.TestCase):

    def test_reload_config(self):
        bad_config = {'listen': 'foo'}
        self.assertRaises(ValueError, MockRestApiServer, None, '', bad_config)
        srv = MockRestApiServer(lambda a1, a2, a3: None, '')
        self.assertRaises(ValueError, srv.reload_config, bad_config)
        self.assertRaises(ValueError, srv.reload_config, {})
        with patch.object(socket.socket, 'setsockopt', Mock(side_effect=socket.error)):
            srv.reload_config({'listen': ':8008'})

    def test_handle_error(self):
        try:
            raise Exception()
        except Exception:
            self.assertIsNone(MockRestApiServer.handle_error(None, ('127.0.0.1', 55555)))