import psycopg2
import unittest

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


class MockPostgresql(Mock):

    name = 'test'
    state = 'running'
    role = 'master'
    server_version = '999999'
    scope = 'dummy'

    @staticmethod
    def connection():
        return psycopg2_connect()

    @staticmethod
    def is_running():
        return True


class MockHa(Mock):

    dcs = Mock()
    state_handler = MockPostgresql()

    @staticmethod
    def schedule_restart():
        return 'restart'

    @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(Mock):

    postgresql = MockPostgresql()
    ha = MockHa()
    dcs = Mock()
    tags = {}
    version = '0.00'


class MockRequest(object):

    def __init__(self, path):
        self.path = path

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


class MockRestApiServer(RestApiServer):

    def __init__(self, Handler, path):
        self.socket = 0
        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', 'certfile': 'dumb'}
        super(MockRestApiServer, self).__init__(MockPatroni(), config)
        Handler(MockRequest(path), ('0.0.0.0', 8080), self)


@patch('ssl.wrap_socket', Mock(return_value=0))
class TestRestApiHandler(unittest.TestCase):

    def test_do_GET(self):
        MockRestApiServer(RestApiHandler, b'GET /replica')
        with patch.object(RestApiHandler, 'get_postgresql_status', Mock(return_value={})):
            MockRestApiServer(RestApiHandler, b'GET /replica')
        with patch.object(RestApiHandler, 'get_postgresql_status', Mock(return_value={'role': 'master'})):
            MockRestApiServer(RestApiHandler, b'GET /replica')
        MockRestApiServer(RestApiHandler, b'GET /master')
        MockPatroni.dcs.cluster.leader.name = MockPostgresql.name
        MockRestApiServer(RestApiHandler, b'GET /replica')
        MockPatroni.dcs.cluster = None
        with patch.object(RestApiHandler, 'get_postgresql_status', Mock(return_value={'role': 'master'})):
            MockRestApiServer(RestApiHandler, b'GET /master')
        with patch.object(MockHa, 'restart_scheduled', Mock(return_value=True)):
            MockRestApiServer(RestApiHandler, b'GET /master')
        MockRestApiServer(RestApiHandler, b'GET /master')

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

        with patch.object(BaseHTTPRequestHandler, 'handle_one_request') as mock_handle_request:
            mock_handle_request.side_effect = socket.error("foo")
            MockRestApiServer(RestApiHandler, b'OPTIONS / HTTP/1.0')

        # make sure socket.error gets propagated via wfile object in finalize()
        with patch.object(MockRequest, 'makefile') as makefile:
            makefile.return_value.closed = False
            makefile.return_value.readline.side_effect = lambda x: b"foo"
            makefile.return_value.flush = Mock(side_effect=socket.error("foo"))
            MockRestApiServer(RestApiHandler, b'OPTIONS / HTTP/1.0')

    def test_do_GET_patroni(self):
        MockRestApiServer(RestApiHandler, b'GET /patroni')

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

    def test_do_POST_restart(self):
        request = b'POST /restart HTTP/1.0\nAuthorization: Basic dGVzdDp0ZXN0'
        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 = b'POST /reinitialize HTTP/1.0\nAuthorization: Basic dGVzdDp0ZXN0'
        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'
        MockRestApiServer(RestApiHandler, request)

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

    @patch('time.sleep', Mock())
    @patch.object(MockHa, 'dcs')
    def test_do_POST_failover(self, dcs):
        cluster = dcs.get_cluster.return_value
        request = b'POST /failover HTTP/1.0\nAuthorization: Basic dGVzdDp0ZXN0\n' +\
                  b'Content-Length: 25\n\n{"leader": "postgresql1"}'
        MockRestApiServer(RestApiHandler, request)
        cluster.leader.name = 'postgresql1'
        MockRestApiServer(RestApiHandler, request)
        cluster.members = [Member(0, 'postgresql0', 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 = '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)
        request = b'POST /failover HTTP/1.0\nAuthorization: Basic dGVzdDp0ZXN0\n' +\
                  b'Content-Length: 50\n\n{"leader": "postgresql1", "member": "postgresql2"}'
        MockRestApiServer(RestApiHandler, request)