import asyncio
from importlib import import_module

import pytest
from asgiref.sync import sync_to_async
from channels.testing import WebsocketCommunicator
from django.conf import settings
from django.contrib.auth import (
    BACKEND_SESSION_KEY,
    HASH_SESSION_KEY,
    SESSION_KEY,
)

from openslides.asgi import application
from openslides.core.config import config
from openslides.utils.autoupdate import inform_deleted_data
from openslides.utils.cache import element_cache

from ...unit.utils.cache_provider import (
    Collection1,
    Collection2,
    get_cachable_provider,
)
from ..helpers import TConfig, TUser, set_config


@pytest.fixture(autouse=True)
async def prepare_element_cache(settings):
    """
    Resets the element cache.

    Uses a cacheable_provider for tests with example data.
    """
    await element_cache.cache_provider.clear_cache()
    orig_cachable_provider = element_cache.cachable_provider
    element_cache.cachable_provider = get_cachable_provider([Collection1(), Collection2(), TConfig(), TUser()])
    element_cache._cachables = None
    await sync_to_async(element_cache.ensure_cache)()
    yield
    # Reset the cachable_provider
    element_cache.cachable_provider = orig_cachable_provider
    element_cache._cachables = None
    await element_cache.cache_provider.clear_cache()


@pytest.fixture
async def get_communicator():
    communicator: WebsocketCommunicator = None

    def get_communicator(query_string=''):
        nonlocal communicator  # use the outer communicator variable
        if query_string:
            query_string = "?{}".format(query_string)
        communicator = WebsocketCommunicator(application, "/ws/site/{}".format(query_string))
        return communicator

    yield get_communicator
    if communicator:
        await communicator.disconnect()


@pytest.fixture
async def communicator(get_communicator):
    yield get_communicator()


@pytest.mark.asyncio
async def test_normal_connection(get_communicator):
    await set_config('general_system_enable_anonymous', True)
    connected, __ = await get_communicator().connect()
    assert connected


@pytest.mark.asyncio
async def test_connection_with_change_id(get_communicator):
    await set_config('general_system_enable_anonymous', True)
    communicator = get_communicator('change_id=0')
    await communicator.connect()

    response = await communicator.receive_json_from()

    type = response.get('type')
    content = response.get('content')
    assert type == 'autoupdate'
    assert 'changed' in content
    assert 'deleted' in content
    assert 'from_change_id' in content
    assert 'to_change_id' in content
    assert Collection1().get_collection_string() in content['changed']
    assert Collection2().get_collection_string() in content['changed']
    assert TConfig().get_collection_string() in content['changed']
    assert TUser().get_collection_string() in content['changed']


@pytest.mark.asyncio
async def test_connection_with_change_id_get_restricted_data_with_restricted_data_cache(get_communicator):
    """
    Test, that the returned data is the restricted_data when restricted_data_cache is activated
    """
    try:
        # Save the value of use_restricted_data_cache
        original_use_restricted_data = element_cache.use_restricted_data_cache
        element_cache.use_restricted_data_cache = True

        await set_config('general_system_enable_anonymous', True)
        communicator = get_communicator('change_id=0')
        await communicator.connect()

        response = await communicator.receive_json_from()

        content = response.get('content')
        assert content['changed']['app/collection1'][0]['value'] == 'restricted_value1'
    finally:
        # reset the value of use_restricted_data_cache
        element_cache.use_restricted_data_cache = original_use_restricted_data


@pytest.mark.asyncio
async def test_connection_with_invalid_change_id(get_communicator):
    await set_config('general_system_enable_anonymous', True)
    communicator = get_communicator('change_id=invalid')
    connected, __ = await communicator.connect()

    assert connected is False


@pytest.mark.asyncio
async def test_connection_with_to_big_change_id(get_communicator):
    await set_config('general_system_enable_anonymous', True)
    communicator = get_communicator('change_id=1000000000000')

    connected, __ = await communicator.connect()

    assert connected is True
    assert await communicator.receive_nothing()


@pytest.mark.asyncio
async def test_changed_data_autoupdate_off(communicator):
    await set_config('general_system_enable_anonymous', True)
    await communicator.connect()

    # Change a config value
    await set_config('general_event_name', 'Test Event')
    assert await communicator.receive_nothing()


@pytest.mark.asyncio
async def test_changed_data_autoupdate_on(get_communicator):
    await set_config('general_system_enable_anonymous', True)
    communicator = get_communicator('autoupdate=on')
    await communicator.connect()

    # Change a config value
    await set_config('general_event_name', 'Test Event')
    response = await communicator.receive_json_from()

    id = config.get_key_to_id()['general_event_name']
    type = response.get('type')
    content = response.get('content')
    assert type == 'autoupdate'
    assert content['changed'] == {
        'core/config': [{'id': id, 'key': 'general_event_name', 'value': 'Test Event'}]}


@pytest.mark.asyncio
async def test_anonymous_disabled(communicator):
    connected, __ = await communicator.connect()

    assert not connected


@pytest.mark.asyncio
async def test_with_user():
    # login user with id 1
    engine = import_module(settings.SESSION_ENGINE)
    session = engine.SessionStore()  # type: ignore
    session[SESSION_KEY] = '1'
    session[HASH_SESSION_KEY] = '362d4f2de1463293cb3aaba7727c967c35de43ee'  # see helpers.TUser
    session[BACKEND_SESSION_KEY] = 'django.contrib.auth.backends.ModelBackend'
    session.save()
    scn = settings.SESSION_COOKIE_NAME
    cookies = (b'cookie', '{}={}'.format(scn, session.session_key).encode())
    communicator = WebsocketCommunicator(application, "/ws/site/", headers=[cookies])

    connected, __ = await communicator.connect()

    assert connected

    await communicator.disconnect()


@pytest.mark.asyncio
async def test_receive_deleted_data(get_communicator):
    await set_config('general_system_enable_anonymous', True)
    communicator = get_communicator('autoupdate=on')
    await communicator.connect()

    # Delete test element
    await sync_to_async(inform_deleted_data)([(Collection1().get_collection_string(), 1)])
    response = await communicator.receive_json_from()

    type = response.get('type')
    content = response.get('content')
    assert type == 'autoupdate'
    assert content['deleted'] == {Collection1().get_collection_string(): [1]}


@pytest.mark.asyncio
async def test_send_notify(communicator):
    await set_config('general_system_enable_anonymous', True)
    await communicator.connect()

    await communicator.send_json_to({'type': 'notify', 'content': [{'testmessage': 'foobar, what else.'}], 'id': 'test'})
    response = await communicator.receive_json_from()

    content = response['content']
    assert isinstance(content, list)
    assert len(content) == 1
    assert content[0]['testmessage'] == 'foobar, what else.'
    assert 'senderReplyChannelName' in content[0]
    assert content[0]['senderUserId'] == 0


@pytest.mark.asyncio
async def test_invalid_websocket_message_type(communicator):
    await set_config('general_system_enable_anonymous', True)
    await communicator.connect()

    await communicator.send_json_to([])

    response = await communicator.receive_json_from()
    assert response['type'] == 'error'


@pytest.mark.asyncio
async def test_invalid_websocket_message_no_id(communicator):
    await set_config('general_system_enable_anonymous', True)
    await communicator.connect()

    await communicator.send_json_to({'type': 'test', 'content': 'foobar'})

    response = await communicator.receive_json_from()
    assert response['type'] == 'error'


@pytest.mark.asyncio
async def test_send_unknown_type(communicator):
    await set_config('general_system_enable_anonymous', True)
    await communicator.connect()

    await communicator.send_json_to({'type': 'if_you_add_this_type_to_openslides_I_will_be_sad', 'content': True, 'id': 'test_id'})

    response = await communicator.receive_json_from()
    assert response['type'] == 'error'
    assert response['in_response'] == 'test_id'


@pytest.mark.asyncio
async def test_request_constants(communicator, settings):
    await set_config('general_system_enable_anonymous', True)
    await communicator.connect()

    await communicator.send_json_to({'type': 'constants', 'content': '', 'id': 'test_id'})

    response = await communicator.receive_json_from()
    assert response['type'] == 'constants'
    # See conftest.py for the content of 'content'
    assert response['content'] == {'constant1': 'value1', 'constant2': 'value2'}


@pytest.mark.asyncio
async def test_send_get_elements(communicator):
    await set_config('general_system_enable_anonymous', True)
    await communicator.connect()

    await communicator.send_json_to({'type': 'getElements', 'content': {}, 'id': 'test_id'})
    response = await communicator.receive_json_from()

    type = response.get('type')
    content = response.get('content')
    assert type == 'autoupdate'
    assert 'changed' in content
    assert 'deleted' in content
    assert 'from_change_id' in content
    assert 'to_change_id' in content
    assert Collection1().get_collection_string() in content['changed']
    assert Collection2().get_collection_string() in content['changed']
    assert TConfig().get_collection_string() in content['changed']
    assert TUser().get_collection_string() in content['changed']


@pytest.mark.asyncio
async def test_send_get_elements_to_big_change_id(communicator):
    await set_config('general_system_enable_anonymous', True)
    await communicator.connect()

    await communicator.send_json_to({'type': 'getElements', 'content': {'change_id': 1_000_000_000_000}, 'id': 'test_id'})
    response = await communicator.receive_json_from()

    type = response.get('type')
    assert type == 'error'
    assert response.get('in_response') == 'test_id'


@pytest.mark.asyncio
async def test_send_get_elements_to_small_change_id(communicator):
    await set_config('general_system_enable_anonymous', True)
    await communicator.connect()

    await communicator.send_json_to({'type': 'getElements', 'content': {'change_id': 1}, 'id': 'test_id'})
    response = await communicator.receive_json_from()

    type = response.get('type')
    assert type == 'autoupdate'
    assert response.get('in_response') == 'test_id'
    assert response.get('content')['all_data']


@pytest.mark.asyncio
async def test_send_connect_twice_with_clear_change_id_cache(communicator):
    """
    Test, that a second request with change_id+1 from the first request, returns
    an error.
    """
    await set_config('general_system_enable_anonymous', True)
    element_cache.cache_provider.change_id_data = {}  # type: ignore
    await communicator.connect()
    await communicator.send_json_to({'type': 'getElements', 'content': {'change_id': 0}, 'id': 'test_id'})
    response1 = await communicator.receive_json_from()
    first_change_id = response1.get('content')['to_change_id']

    await communicator.send_json_to({'type': 'getElements', 'content': {'change_id': first_change_id+1}, 'id': 'test_id'})
    response2 = await communicator.receive_json_from()

    assert response2['type'] == 'error'
    assert response2.get('content') == 'Requested change_id is higher this highest change_id.'


@pytest.mark.asyncio
async def test_send_connect_twice_with_clear_change_id_cache_same_change_id_then_first_request(communicator):
    """
    Test, that a second request with the change_id from the first request, returns
    all data.

    A client should not do this but request for change_id+1
    """
    await set_config('general_system_enable_anonymous', True)
    element_cache.cache_provider.change_id_data = {}  # type: ignore
    await communicator.connect()
    await communicator.send_json_to({'type': 'getElements', 'content': {'change_id': 0}, 'id': 'test_id'})
    response1 = await communicator.receive_json_from()
    first_change_id = response1.get('content')['to_change_id']

    await communicator.send_json_to({'type': 'getElements', 'content': {'change_id': first_change_id}, 'id': 'test_id'})
    response2 = await communicator.receive_json_from()

    assert response2['type'] == 'autoupdate'
    assert response2.get('content')['all_data']


@pytest.mark.asyncio
async def test_send_invalid_get_elements(communicator):
    await set_config('general_system_enable_anonymous', True)
    await communicator.connect()

    await communicator.send_json_to({'type': 'getElements', 'content': {'change_id': 'some value'}, 'id': 'test_id'})
    response = await communicator.receive_json_from()

    type = response.get('type')
    assert type == 'error'
    assert response.get('in_response') == 'test_id'


@pytest.mark.asyncio
async def test_turn_on_autoupdate(communicator):
    await set_config('general_system_enable_anonymous', True)
    await communicator.connect()

    await communicator.send_json_to({'type': 'autoupdate', 'content': 'on', 'id': 'test_id'})
    await asyncio.sleep(0.01)
    # Change a config value
    await set_config('general_event_name', 'Test Event')
    response = await communicator.receive_json_from()

    id = config.get_key_to_id()['general_event_name']
    type = response.get('type')
    content = response.get('content')
    assert type == 'autoupdate'
    assert content['changed'] == {
        'core/config': [{'id': id, 'key': 'general_event_name', 'value': 'Test Event'}]}


@pytest.mark.asyncio
async def test_turn_off_autoupdate(get_communicator):
    await set_config('general_system_enable_anonymous', True)
    communicator = get_communicator('autoupdate=on')
    await communicator.connect()

    await communicator.send_json_to({'type': 'autoupdate', 'content': False, 'id': 'test_id'})
    await asyncio.sleep(0.01)
    # Change a config value
    await set_config('general_event_name', 'Test Event')
    assert await communicator.receive_nothing()