# Copyright 2021-2023 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import contextlib
import logging
import os

from bumble import utils
from pyee import EventEmitter
from unittest.mock import MagicMock


def test_on() -> None:
    emitter = EventEmitter()
    with contextlib.closing(utils.EventWatcher()) as context:
        mock = MagicMock()
        context.on(emitter, 'event', mock)

        emitter.emit('event')

    assert not emitter.listeners('event')
    assert mock.call_count == 1


def test_on_decorator() -> None:
    emitter = EventEmitter()
    with contextlib.closing(utils.EventWatcher()) as context:
        mock = MagicMock()

        @context.on(emitter, 'event')
        def on_event(*_) -> None:
            mock()

        emitter.emit('event')

    assert not emitter.listeners('event')
    assert mock.call_count == 1


def test_multiple_handlers() -> None:
    emitter = EventEmitter()
    with contextlib.closing(utils.EventWatcher()) as context:
        mock = MagicMock()

        context.once(emitter, 'a', mock)
        context.once(emitter, 'b', mock)

        emitter.emit('b', 'b')

    assert not emitter.listeners('a')
    assert not emitter.listeners('b')

    mock.assert_called_once_with('b')


# -----------------------------------------------------------------------------
def run_tests():
    test_on()
    test_on_decorator()
    test_multiple_handlers()


# -----------------------------------------------------------------------------
if __name__ == '__main__':
    logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'INFO').upper())
    run_tests()