import asyncio

from rasa.utils.endpoints import EndpointConfig
from sanic.request import Request
import uuid
from datetime import datetime

from typing import Generator, Callable, Dict, Text

from scipy import sparse

import pytest

from rasa.core.agent import Agent
from rasa.core.channels.channel import CollectingOutputChannel, OutputChannel
from rasa.shared.core.domain import Domain
from rasa.shared.core.events import ReminderScheduled, UserUttered, ActionExecuted
from rasa.core.nlg import TemplatedNaturalLanguageGenerator, NaturalLanguageGenerator
from rasa.core.processor import MessageProcessor
from rasa.shared.core.slots import Slot
from rasa.core.tracker_store import MongoTrackerStore
from rasa.shared.core.trackers import DialogueStateTracker
from rasa.shared.nlu.training_data.features import Features
from rasa.shared.nlu.constants import INTENT, ACTION_NAME, FEATURE_TYPE_SENTENCE
from tests.dialogues import TEST_MOODBOT_DIALOGUE
from tests.core.utilities import tracker_from_dialogue


class CustomSlot(Slot):
    type_name = "custom"

    def _as_feature(self):
        return [0.5]


class MockedMongoTrackerStore(MongoTrackerStore):
    """In-memory mocked version of `MongoTrackerStore`."""

    def __init__(self, _domain: Domain) -> None:
        from mongomock import MongoClient

        self.db = MongoClient().rasa
        self.collection = "conversations"

        # skipcq: PYL-E1003
        # Skip `MongoTrackerStore` constructor to avoid that actual Mongo connection
        # is created.
        super(MongoTrackerStore, self).__init__(_domain, None)


# https://github.com/pytest-dev/pytest-asyncio/issues/68
# this event_loop is used by pytest-asyncio, and redefining it
# is currently the only way of changing the scope of this fixture
# update: implement fix to RuntimeError Event loop is closed issue described
# here: https://github.com/pytest-dev/pytest-asyncio/issues/371
@pytest.fixture(scope="session")
def event_loop(request: Request) -> Generator[asyncio.AbstractEventLoop, None, None]:
    loop = asyncio.get_event_loop_policy().new_event_loop()
    loop._close = loop.close
    loop.close = lambda: None
    yield loop
    loop._close()


# override loop fixture to prevent ScopeMismatch pytest error and
# align the result of the loop fixture with that of the event_loop fixture
@pytest.fixture(scope="session")
def loop(
    event_loop: asyncio.AbstractEventLoop,
) -> Generator[asyncio.AbstractEventLoop, None, None]:
    yield event_loop


@pytest.fixture
def default_channel() -> OutputChannel:
    return CollectingOutputChannel()


@pytest.fixture
async def default_processor(default_agent: Agent) -> MessageProcessor:
    return default_agent.processor


@pytest.fixture
async def tracker_with_six_scheduled_reminders(
    default_processor: MessageProcessor,
) -> DialogueStateTracker:
    reminders = [
        ReminderScheduled("greet", datetime.now(), kill_on_user_message=False),
        ReminderScheduled(
            intent="greet",
            entities=[{"entity": "name", "value": "Jane Doe"}],
            trigger_date_time=datetime.now(),
            kill_on_user_message=False,
        ),
        ReminderScheduled(
            intent="default",
            entities=[{"entity": "name", "value": "Jane Doe"}],
            trigger_date_time=datetime.now(),
            kill_on_user_message=False,
        ),
        ReminderScheduled(
            intent="greet",
            entities=[{"entity": "name", "value": "Bruce Wayne"}],
            trigger_date_time=datetime.now(),
            kill_on_user_message=False,
        ),
        ReminderScheduled("default", datetime.now(), kill_on_user_message=False),
        ReminderScheduled(
            "default", datetime.now(), kill_on_user_message=False, name="special"
        ),
    ]
    sender_id = uuid.uuid4().hex
    tracker = await default_processor.tracker_store.get_or_create_tracker(sender_id)
    for reminder in reminders:
        tracker.update(UserUttered("test"))
        tracker.update(ActionExecuted("action_reminder_reminder"))
        tracker.update(reminder)

    await default_processor.tracker_store.save(tracker)

    return tracker


@pytest.fixture
def default_nlg(domain: Domain) -> NaturalLanguageGenerator:
    return TemplatedNaturalLanguageGenerator(domain.responses)


@pytest.fixture
def default_tracker(domain: Domain) -> DialogueStateTracker:
    return DialogueStateTracker("my-sender", domain.slots)


@pytest.fixture(scope="session")
async def trained_formbot(trained_async: Callable) -> Text:
    return await trained_async(
        domain="examples/formbot/domain.yml",
        config="examples/formbot/config.yml",
        training_files=[
            "examples/formbot/data/rules.yml",
            "examples/formbot/data/stories.yml",
        ],
    )


@pytest.fixture(scope="module")
async def form_bot_agent(trained_formbot: Text) -> Agent:
    endpoint = EndpointConfig("https://example.com/webhooks/actions")

    return Agent.load(trained_formbot, action_endpoint=endpoint)


@pytest.fixture
def moodbot_features(
    request: Request, moodbot_domain: Domain
) -> Dict[Text, Dict[Text, Features]]:
    """Makes intent and action features for the moodbot domain to faciliate
    making expected state features.

    Returns:
      A dict containing dicts for mapping action and intent names to features.
    """
    origin = getattr(request, "param", "SingleStateFeaturizer")
    action_shape = (1, len(moodbot_domain.action_names_or_texts))
    actions = {}
    for index, action in enumerate(moodbot_domain.action_names_or_texts):
        actions[action] = Features(
            sparse.coo_matrix(([1.0], [[0], [index]]), shape=action_shape),
            FEATURE_TYPE_SENTENCE,
            ACTION_NAME,
            origin,
        )
    intent_shape = (1, len(moodbot_domain.intents))
    intents = {}
    for index, intent in enumerate(moodbot_domain.intents):
        intents[intent] = Features(
            sparse.coo_matrix(([1.0], [[0], [index]]), shape=intent_shape),
            FEATURE_TYPE_SENTENCE,
            INTENT,
            origin,
        )
    return {"intents": intents, "actions": actions}


@pytest.fixture
def moodbot_tracker(moodbot_domain: Domain) -> DialogueStateTracker:
    return tracker_from_dialogue(TEST_MOODBOT_DIALOGUE, moodbot_domain)