import json
import psycopg2
import unittest

from mock import Mock, patch
from patroni.api import RestApiHandler, RestApiServer
from patroni.dcs import ClusterConfig, Member
from six import BytesIO as IO
from six.moves import BaseHTTPServer
from test_postgresql import psycopg2_connect, MockCursor


class MockPostgresql(object):

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

    @staticmethod
    def connection():
        return psycopg2_connect()


class MockHa(object):

    dcs = Mock()
    state_handler = MockPostgresql()

    @staticmethod
    def schedule_reinitialize():
        return 'reinitialize'

    @staticmethod
    def restart():
        return (True, '')

    @staticmethod
    def restart_scheduled():
        return False

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


class MockPatroni(object):

    nap_time = 10
    config = Mock()
    postgresql = MockPostgresql()
    ha = MockHa()
    dcs = Mock()
    tags = {}
    version = '0.00'
    noloadbalance = Mock(return_value=False)

    @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)


class MockRestApiServer(RestApiServer):

    def __init__(self, Handler, request):
        self.socket = 0
        self.serve_forever = Mock()
        BaseHTTPServer.HTTPServer.__init__ = Mock()
        MockRestApiServer._BaseServer__is_shut_down = Mock()
        MockRestApiServer._BaseServer__shutdown_request = True
        config = {'listen': '127.0.0.1:8008', 'auth': 'test:test'}
        super(MockRestApiServer, self).__init__(MockPatroni(), config)
        config['certfile'] = 'dumb'
        self.reload_config(config)
        Handler(MockRequest(request), ('0.0.0.0', 8080), self)


@patch('ssl.wrap_socket', Mock(return_value=0))
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')
        MockRestApiServer(RestApiHandler, 'GET /master')
        MockPatroni.dcs.cluster.leader.name = MockPostgresql.name
        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'))

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

    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(MockHa, '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(MockHa, '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(MockHa, '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))

    def test_do_POST_restart(self):
        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)

    @patch.object(MockHa, 'dcs')
    def test_do_POST_reinitialize(self, dcs):
        cluster = dcs.get_cluster.return_value
        request = 'POST /reinitialize HTTP/1.0' + self._authorization
        MockRestApiServer(RestApiHandler, request)
        cluster.is_unlocked.return_value = False
        MockRestApiServer(RestApiHandler, request)
        with patch.object(MockHa, 'schedule_reinitialize', Mock(return_value=None)):
            MockRestApiServer(RestApiHandler, request)
        cluster.leader.name = 'test'
        self.assertIsNotNone(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(MockHa, 'dcs')
    def test_do_POST_failover(self, dcs):
        cluster = dcs.get_cluster.return_value

        post = 'POST /failover 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)

        MockRestApiServer(RestApiHandler, post + '25\n\n{"leader": "postgresql1"}')

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

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

        cluster.members = [Member(0, 'postgresql0', 30, {'api_url': 'http'}),
                           Member(0, 'postgresql2', 30, {'api_url': 'http'})]
        MockRestApiServer(RestApiHandler, request)
        with patch.object(MockPatroni, 'dcs') as d:
            cluster = d.get_cluster.return_value
            cluster.leader.name = 'postgresql0'
            MockRestApiServer(RestApiHandler, request)
            cluster.leader.name = 'postgresql2'
            MockRestApiServer(RestApiHandler, request)
            cluster.leader.name = 'postgresql1'
            cluster.failover = None
            MockRestApiServer(RestApiHandler, request)
            d.get_cluster = Mock(side_effect=Exception)
            MockRestApiServer(RestApiHandler, request)
            d.manual_failover.return_value = False
            MockRestApiServer(RestApiHandler, request)
        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"}'))