# coding: utf-8
# Copyright 2016 Étienne Bersac
#
# 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
#
# http://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 asyncio
import unittest

import six

from tenacity import RetryError
from tenacity import _asyncio as tasyncio
from tenacity import retry, stop_after_attempt
from tenacity.tests.test_tenacity import NoIOErrorAfterCount


def asynctest(callable_):
    callable_ = asyncio.coroutine(callable_)

    @six.wraps(callable_)
    def wrapper(*a, **kw):
        loop = asyncio.get_event_loop()
        return loop.run_until_complete(callable_(*a, **kw))

    return wrapper


@retry
@asyncio.coroutine
def _retryable_coroutine(thing):
    yield from asyncio.sleep(0.00001)
    return thing.go()


@retry(stop=stop_after_attempt(2))
@asyncio.coroutine
def _retryable_coroutine_with_2_attempts(thing):
    yield from asyncio.sleep(0.00001)
    thing.go()


class TestAsync(unittest.TestCase):
    @asynctest
    def test_retry(self):
        assert asyncio.iscoroutinefunction(_retryable_coroutine)
        thing = NoIOErrorAfterCount(5)
        yield from _retryable_coroutine(thing)
        assert thing.counter == thing.count

    @asynctest
    def test_stop_after_attempt(self):
        assert asyncio.iscoroutinefunction(
            _retryable_coroutine_with_2_attempts)
        thing = NoIOErrorAfterCount(2)
        try:
            yield from _retryable_coroutine_with_2_attempts(thing)
        except RetryError:
            assert thing.counter == 2

    def test_repr(self):
        repr(tasyncio.AsyncRetrying())

    @asynctest
    def test_attempt_number_is_correct_for_interleaved_coroutines(self):

        attempts = []

        def after(retry_state):
            attempts.append((retry_state.args[0], retry_state.attempt_number))

        thing1 = NoIOErrorAfterCount(3)
        thing2 = NoIOErrorAfterCount(3)
        future1 = asyncio.ensure_future(
            _retryable_coroutine.retry_with(after=after)(thing1))
        future2 = asyncio.ensure_future(
            _retryable_coroutine.retry_with(after=after)(thing2))
        yield from asyncio.gather(future1, future2)

        # There's no waiting on retry, only a wait in the coroutine, so the
        # executions should be interleaved.
        thing1_attempts = attempts[::2]
        things1, attempt_nos1 = zip(*thing1_attempts)
        assert all(thing is thing1 for thing in things1)
        assert list(attempt_nos1) == [1, 2, 3]

        thing2_attempts = attempts[1::2]
        things2, attempt_nos2 = zip(*thing2_attempts)
        assert all(thing is thing2 for thing in things2)
        assert list(attempt_nos2) == [1, 2, 3]


if __name__ == '__main__':
    unittest.main()