import asyncio
import sys
import time
import unittest
from unittest import mock

import pytest

from engineio import asyncio_socket
from engineio import exceptions
from engineio import packet
from engineio import payload


def AsyncMock(*args, **kwargs):
    """Return a mock asynchronous function."""
    m = mock.MagicMock(*args, **kwargs)

    async def mock_coro(*args, **kwargs):
        return m(*args, **kwargs)

    mock_coro.mock = m
    return mock_coro


def _run(coro):
    """Run the given coroutine."""
    return asyncio.get_event_loop().run_until_complete(coro)


@unittest.skipIf(sys.version_info < (3, 5), 'only for Python 3.5+')
class TestSocket(unittest.TestCase):
    def _get_read_mock_coro(self, payload):
        mock_input = mock.MagicMock()
        mock_input.read = AsyncMock()
        mock_input.read.mock.return_value = payload
        return mock_input

    def _get_mock_server(self):
        mock_server = mock.Mock()
        mock_server.ping_timeout = 0.2
        mock_server.ping_interval = 0.2
        mock_server.ping_interval_grace_period = 0.001
        mock_server.async_handlers = False
        mock_server.max_http_buffer_size = 128
        mock_server._async = {
            'asyncio': True,
            'create_route': mock.MagicMock(),
            'translate_request': mock.MagicMock(),
            'make_response': mock.MagicMock(),
            'websocket': 'w',
        }
        mock_server._async['translate_request'].return_value = 'request'
        mock_server._async['make_response'].return_value = 'response'
        mock_server._trigger_event = AsyncMock()

        def bg_task(target, *args, **kwargs):
            return asyncio.ensure_future(target(*args, **kwargs))

        def create_queue(*args, **kwargs):
            queue = asyncio.Queue(*args, **kwargs)
            queue.Empty = asyncio.QueueEmpty
            return queue

        mock_server.start_background_task = bg_task
        mock_server.create_queue = create_queue
        return mock_server

    def test_create(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        assert s.server == mock_server
        assert s.sid == 'sid'
        assert not s.upgraded
        assert not s.closed
        assert hasattr(s.queue, 'get')
        assert hasattr(s.queue, 'put')
        assert hasattr(s.queue, 'task_done')
        assert hasattr(s.queue, 'join')

    def test_empty_poll(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        with pytest.raises(exceptions.QueueEmpty):
            _run(s.poll())

    def test_poll(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        pkt1 = packet.Packet(packet.MESSAGE, data='hello')
        pkt2 = packet.Packet(packet.MESSAGE, data='bye')
        _run(s.send(pkt1))
        _run(s.send(pkt2))
        assert _run(s.poll()) == [pkt1, pkt2]

    def test_poll_none(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        _run(s.queue.put(None))
        assert _run(s.poll()) == []

    def test_poll_none_after_packet(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        pkt = packet.Packet(packet.MESSAGE, data='hello')
        _run(s.send(pkt))
        _run(s.queue.put(None))
        assert _run(s.poll()) == [pkt]
        assert _run(s.poll()) == []

    def test_schedule_ping(self):
        mock_server = self._get_mock_server()
        mock_server.ping_interval = 0.01
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.send = AsyncMock()

        async def schedule_ping():
            s.schedule_ping()
            await asyncio.sleep(0.05)

        _run(schedule_ping())
        assert s.last_ping is not None
        assert s.send.mock.call_args_list[0][0][0].encode() == '2'

    def test_schedule_ping_closed_socket(self):
        mock_server = self._get_mock_server()
        mock_server.ping_interval = 0.01
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.send = AsyncMock()
        s.closed = True

        async def schedule_ping():
            s.schedule_ping()
            await asyncio.sleep(0.05)

        _run(schedule_ping())
        assert s.last_ping is None
        s.send.mock.assert_not_called()

    def test_pong(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.schedule_ping = mock.MagicMock()
        _run(s.receive(packet.Packet(packet.PONG, data='abc')))
        s.schedule_ping.assert_called_once_with()

    def test_message_sync_handler(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        _run(s.receive(packet.Packet(packet.MESSAGE, data='foo')))
        mock_server._trigger_event.mock.assert_called_once_with(
            'message', 'sid', 'foo', run_async=False
        )

    def test_message_async_handler(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        mock_server.async_handlers = True
        _run(s.receive(packet.Packet(packet.MESSAGE, data='foo')))
        mock_server._trigger_event.mock.assert_called_once_with(
            'message', 'sid', 'foo', run_async=True
        )

    def test_invalid_packet(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        with pytest.raises(exceptions.UnknownPacketError):
            _run(s.receive(packet.Packet(packet.OPEN)))

    def test_timeout(self):
        mock_server = self._get_mock_server()
        mock_server.ping_interval = 6
        mock_server.ping_interval_grace_period = 2
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.last_ping = time.time() - 9
        s.close = AsyncMock()
        _run(s.send('packet'))
        s.close.mock.assert_called_once_with(wait=False, abort=False)

    def test_polling_read(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'foo')
        pkt1 = packet.Packet(packet.MESSAGE, data='hello')
        pkt2 = packet.Packet(packet.MESSAGE, data='bye')
        _run(s.send(pkt1))
        _run(s.send(pkt2))
        environ = {'REQUEST_METHOD': 'GET', 'QUERY_STRING': 'sid=foo'}
        packets = _run(s.handle_get_request(environ))
        assert packets == [pkt1, pkt2]

    def test_polling_read_error(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'foo')
        environ = {'REQUEST_METHOD': 'GET', 'QUERY_STRING': 'sid=foo'}
        with pytest.raises(exceptions.QueueEmpty):
            _run(s.handle_get_request(environ))

    def test_polling_write(self):
        mock_server = self._get_mock_server()
        mock_server.max_http_buffer_size = 1000
        pkt1 = packet.Packet(packet.MESSAGE, data='hello')
        pkt2 = packet.Packet(packet.MESSAGE, data='bye')
        p = payload.Payload(packets=[pkt1, pkt2]).encode().encode('utf-8')
        s = asyncio_socket.AsyncSocket(mock_server, 'foo')
        s.receive = AsyncMock()
        environ = {
            'REQUEST_METHOD': 'POST',
            'QUERY_STRING': 'sid=foo',
            'CONTENT_LENGTH': len(p),
            'wsgi.input': self._get_read_mock_coro(p),
        }
        _run(s.handle_post_request(environ))
        assert s.receive.mock.call_count == 2

    def test_polling_write_too_large(self):
        mock_server = self._get_mock_server()
        pkt1 = packet.Packet(packet.MESSAGE, data='hello')
        pkt2 = packet.Packet(packet.MESSAGE, data='bye')
        p = payload.Payload(packets=[pkt1, pkt2]).encode().encode('utf-8')
        mock_server.max_http_buffer_size = len(p) - 1
        s = asyncio_socket.AsyncSocket(mock_server, 'foo')
        s.receive = AsyncMock()
        environ = {
            'REQUEST_METHOD': 'POST',
            'QUERY_STRING': 'sid=foo',
            'CONTENT_LENGTH': len(p),
            'wsgi.input': self._get_read_mock_coro(p),
        }
        with pytest.raises(exceptions.ContentTooLongError):
            _run(s.handle_post_request(environ))

    def test_upgrade_handshake(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'foo')
        s._upgrade_websocket = AsyncMock()
        environ = {
            'REQUEST_METHOD': 'GET',
            'QUERY_STRING': 'sid=foo',
            'HTTP_CONNECTION': 'Foo,Upgrade,Bar',
            'HTTP_UPGRADE': 'websocket',
        }
        _run(s.handle_get_request(environ))
        s._upgrade_websocket.mock.assert_called_once_with(environ)

    def test_upgrade(self):
        mock_server = self._get_mock_server()
        mock_server._async['websocket'] = mock.MagicMock()
        mock_ws = AsyncMock()
        mock_server._async['websocket'].return_value = mock_ws
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = True
        environ = "foo"
        _run(s._upgrade_websocket(environ))
        mock_server._async['websocket'].assert_called_once_with(
            s._websocket_handler
        )
        mock_ws.mock.assert_called_once_with(environ)

    def test_upgrade_twice(self):
        mock_server = self._get_mock_server()
        mock_server._async['websocket'] = mock.MagicMock()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = True
        s.upgraded = True
        environ = "foo"
        with pytest.raises(IOError):
            _run(s._upgrade_websocket(environ))

    def test_upgrade_packet(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = True
        _run(s.receive(packet.Packet(packet.UPGRADE)))
        r = _run(s.poll())
        assert len(r) == 1
        assert r[0].encode() == packet.Packet(packet.NOOP).encode()

    def test_upgrade_no_probe(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = True
        ws = mock.MagicMock()
        ws.wait = AsyncMock()
        ws.wait.mock.return_value = packet.Packet(packet.NOOP).encode()
        _run(s._websocket_handler(ws))
        assert not s.upgraded

    def test_upgrade_no_upgrade_packet(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = True
        s.queue.join = AsyncMock(return_value=None)
        ws = mock.MagicMock()
        ws.send = AsyncMock()
        ws.wait = AsyncMock()
        probe = 'probe'
        ws.wait.mock.side_effect = [
            packet.Packet(packet.PING, data=probe).encode(),
            packet.Packet(packet.NOOP).encode(),
        ]
        _run(s._websocket_handler(ws))
        ws.send.mock.assert_called_once_with(
            packet.Packet(packet.PONG, data=probe).encode()
        )
        assert _run(s.queue.get()).packet_type == packet.NOOP
        assert not s.upgraded

    def test_upgrade_not_supported(self):
        mock_server = self._get_mock_server()
        mock_server._async['websocket'] = None
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = True
        environ = "foo"
        _run(s._upgrade_websocket(environ))
        mock_server._bad_request.assert_called_once_with()

    def test_close_packet(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = True
        s.close = AsyncMock()
        _run(s.receive(packet.Packet(packet.CLOSE)))
        s.close.mock.assert_called_once_with(wait=False, abort=True)

    def test_websocket_read_write(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = False
        s.queue.join = AsyncMock(return_value=None)
        foo = 'foo'
        bar = 'bar'
        s.poll = AsyncMock(
            side_effect=[[packet.Packet(packet.MESSAGE, data=bar)], None]
        )
        ws = mock.MagicMock()
        ws.send = AsyncMock()
        ws.wait = AsyncMock()
        ws.wait.mock.side_effect = [
            packet.Packet(packet.MESSAGE, data=foo).encode(),
            None,
        ]
        _run(s._websocket_handler(ws))
        assert s.connected
        assert s.upgraded
        assert mock_server._trigger_event.mock.call_count == 2
        mock_server._trigger_event.mock.assert_has_calls(
            [
                mock.call('message', 'sid', 'foo', run_async=False),
                mock.call('disconnect', 'sid'),
            ]
        )
        ws.send.mock.assert_called_with('4bar')

    def test_websocket_upgrade_read_write(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = True
        s.queue.join = AsyncMock(return_value=None)
        foo = 'foo'
        bar = 'bar'
        probe = 'probe'
        s.poll = AsyncMock(
            side_effect=[
                [packet.Packet(packet.MESSAGE, data=bar)],
                exceptions.QueueEmpty,
            ]
        )
        ws = mock.MagicMock()
        ws.send = AsyncMock()
        ws.wait = AsyncMock()
        ws.wait.mock.side_effect = [
            packet.Packet(packet.PING, data=probe).encode(),
            packet.Packet(packet.UPGRADE).encode(),
            packet.Packet(packet.MESSAGE, data=foo).encode(),
            None,
        ]
        _run(s._websocket_handler(ws))
        assert s.upgraded
        assert mock_server._trigger_event.mock.call_count == 2
        mock_server._trigger_event.mock.assert_has_calls(
            [
                mock.call('message', 'sid', 'foo', run_async=False),
                mock.call('disconnect', 'sid'),
            ]
        )
        ws.send.mock.assert_called_with('4bar')

    def test_websocket_upgrade_with_payload(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = True
        s.queue.join = AsyncMock(return_value=None)
        probe = 'probe'
        ws = mock.MagicMock()
        ws.send = AsyncMock()
        ws.wait = AsyncMock()
        ws.wait.mock.side_effect = [
            packet.Packet(packet.PING, data=probe).encode(),
            packet.Packet(packet.UPGRADE, data='2').encode(),
        ]
        _run(s._websocket_handler(ws))
        assert s.upgraded

    def test_websocket_upgrade_with_backlog(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = True
        s.queue.join = AsyncMock(return_value=None)
        probe = 'probe'
        foo = 'foo'
        ws = mock.MagicMock()
        ws.send = AsyncMock()
        ws.wait = AsyncMock()
        ws.wait.mock.side_effect = [
            packet.Packet(packet.PING, data=probe).encode(),
            packet.Packet(packet.UPGRADE, data='2').encode(),
        ]
        s.upgrading = True
        _run(s.send(packet.Packet(packet.MESSAGE, data=foo)))
        environ = {'REQUEST_METHOD': 'GET', 'QUERY_STRING': 'sid=sid'}
        packets = _run(s.handle_get_request(environ))
        assert len(packets) == 1
        assert packets[0].encode() == '6'
        packets = _run(s.poll())
        assert len(packets) == 1
        assert packets[0].encode() == '4foo'

        _run(s._websocket_handler(ws))
        assert s.upgraded
        assert not s.upgrading
        packets = _run(s.handle_get_request(environ))
        assert len(packets) == 1
        assert packets[0].encode() == '6'

    def test_websocket_read_write_wait_fail(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = False
        s.queue.join = AsyncMock(return_value=None)
        foo = 'foo'
        bar = 'bar'
        s.poll = AsyncMock(
            side_effect=[
                [packet.Packet(packet.MESSAGE, data=bar)],
                [packet.Packet(packet.MESSAGE, data=bar)],
                exceptions.QueueEmpty,
            ]
        )
        ws = mock.MagicMock()
        ws.send = AsyncMock()
        ws.wait = AsyncMock()
        ws.wait.mock.side_effect = [
            packet.Packet(packet.MESSAGE, data=foo).encode(),
            RuntimeError,
        ]
        ws.send.mock.side_effect = [None, RuntimeError]
        _run(s._websocket_handler(ws))
        assert s.closed

    def test_websocket_upgrade_with_large_packet(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = True
        s.queue.join = AsyncMock(return_value=None)
        probe = 'probe'
        ws = mock.MagicMock()
        ws.send = AsyncMock()
        ws.wait = AsyncMock()
        ws.wait.mock.side_effect = [
            packet.Packet(packet.PING, data=probe).encode(),
            packet.Packet(packet.UPGRADE, data='2' * 128).encode(),
        ]
        with pytest.raises(ValueError):
            _run(s._websocket_handler(ws))
        assert not s.upgraded

    def test_websocket_ignore_invalid_packet(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.connected = False
        s.queue.join = AsyncMock(return_value=None)
        foo = 'foo'
        bar = 'bar'
        s.poll = AsyncMock(
            side_effect=[
                [packet.Packet(packet.MESSAGE, data=bar)],
                exceptions.QueueEmpty,
            ]
        )
        ws = mock.MagicMock()
        ws.send = AsyncMock()
        ws.wait = AsyncMock()
        ws.wait.mock.side_effect = [
            packet.Packet(packet.OPEN).encode(),
            packet.Packet(packet.MESSAGE, data=foo).encode(),
            None,
        ]
        _run(s._websocket_handler(ws))
        assert s.connected
        assert mock_server._trigger_event.mock.call_count == 2
        mock_server._trigger_event.mock.assert_has_calls(
            [
                mock.call('message', 'sid', foo, run_async=False),
                mock.call('disconnect', 'sid'),
            ]
        )
        ws.send.mock.assert_called_with('4bar')

    def test_send_after_close(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        _run(s.close(wait=False))
        with pytest.raises(exceptions.SocketIsClosedError):
            _run(s.send(packet.Packet(packet.NOOP)))

    def test_close_after_close(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        _run(s.close(wait=False))
        assert s.closed
        assert mock_server._trigger_event.mock.call_count == 1
        mock_server._trigger_event.mock.assert_called_once_with(
            'disconnect', 'sid'
        )
        _run(s.close())
        assert mock_server._trigger_event.mock.call_count == 1

    def test_close_and_wait(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.queue = mock.MagicMock()
        s.queue.put = AsyncMock()
        s.queue.join = AsyncMock()
        _run(s.close(wait=True))
        s.queue.join.mock.assert_called_once_with()

    def test_close_without_wait(self):
        mock_server = self._get_mock_server()
        s = asyncio_socket.AsyncSocket(mock_server, 'sid')
        s.queue = mock.MagicMock()
        s.queue.put = AsyncMock()
        s.queue.join = AsyncMock()
        _run(s.close(wait=False))
        assert s.queue.join.mock.call_count == 0
