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import sys

from unittest.mock import patch

import pytest
import txaio
from txaio.testutil import replace_loop
from util import run_once


def test_default_reactor(framework_tx):
    """
    run the code that defaults txaio.config.loop
    """
    pytest.importorskip('twisted')

    assert txaio.config.loop is None
    try:
        txaio.call_later(1, lambda: None)

        from twisted.internet import reactor
        assert txaio.config.loop is reactor
    finally:
        txaio.config.loop = None


def test_explicit_reactor_future(framework):
    """
    If we set an event-loop, Futures + Tasks should use it.
    """
    pytest.importorskip('asyncio')
    if txaio.using_twisted:
        pytest.skip()

    with patch.object(txaio.config, 'loop') as fake_loop:
        f = txaio.create_future('result')
        f.add_done_callback(lambda _: None)

        if sys.version_info < (3, 5, 2):
            assert len(fake_loop.method_calls) == 2
            c = fake_loop.method_calls[1]
            assert c[0] == 'call_soon'
        else:
            assert len(fake_loop.method_calls) == 1
            c = fake_loop.method_calls[0]
            assert c[0] == 'create_future'


def test_create_future_explicit_loop(framework):
    """
    process events on alternate loop= for create_future later
    """
    pytest.importorskip('asyncio')
    if txaio.using_twisted:
        pytest.skip()

    import asyncio

    alt_loop = asyncio.new_event_loop()

    txa = txaio.with_config(loop=alt_loop)
    f = txa.create_future()

    results = []
    f.add_done_callback(lambda r: results.append(r.result()))

    assert results == []
    txaio.resolve(f, 'some result')

    # run_once() runs the txaio.config.loop so we shouldn't get any
    # results until we spin alt_loop
    assert results == []
    run_once()
    assert results == []
    with replace_loop(alt_loop):
        run_once()
    assert results == ['some result']


def test_create_future_success_explicit_loop(framework):
    """
    process events on alternate loop= for create_future later
    """
    pytest.importorskip('asyncio')
    if txaio.using_twisted:
        pytest.skip()

    import asyncio
    alt_loop = asyncio.new_event_loop()
    txa = txaio.with_config(loop=alt_loop)

    f = txa.create_future_success('some result')

    results = []
    f.add_done_callback(lambda r: results.append(r.result()))

    # run_once() runs the txaio.config.loop so we shouldn't get any
    # results until we spin alt_loop
    assert results == []
    run_once()
    assert results == []
    with replace_loop(alt_loop):
        run_once()
    assert results == ['some result']


def test_create_future_failure_explicit_loop(framework):
    """
    process events on alternate loop= for create_future later
    """
    pytest.importorskip('asyncio')
    if txaio.using_twisted:
        pytest.skip()

    import asyncio
    alt_loop = asyncio.new_event_loop()
    the_exception = Exception('bad')
    txa = txaio.with_config(loop=alt_loop)
    f = txa.create_future_error(the_exception)

    results = []

    def boom(r):
        try:
            results.append(r.result())
        except Exception as e:
            results.append(e)
    f.add_done_callback(boom)

    # run_once() runs the txaio.config.loop so we shouldn't get any
    # results until we spin alt_loop
    assert results == []
    run_once()
    assert results == []
    with replace_loop(alt_loop):
        run_once()
    assert results == [the_exception]


def test_explicit_reactor_coroutine(framework):
    """
    If we set an event-loop, Futures + Tasks should use it.
    """
    pytest.importorskip('asyncio')
    if txaio.using_twisted:
        pytest.skip()
    try:
        from asyncio import coroutine
    except ImportError:
        pytest.skip('skipping test: @asyncio.coroutine decorator is removed since Python 3.11')
    else:
        @coroutine
        def some_coroutine():
            yield 'nothing'

        with patch.object(txaio.config, 'loop') as fake_loop:
            txaio.as_future(some_coroutine)

            if sys.version_info < (3, 4, 2):
                assert len(fake_loop.method_calls) == 2
                c = fake_loop.method_calls[1]
                assert c[0] == 'call_soon'
            else:
                assert len(fake_loop.method_calls) == 1
                c = fake_loop.method_calls[0]
                assert c[0] == 'create_task'


def test_call_later_tx(framework_tx):
    '''
    Wait for two Futures.
    '''

    from twisted.internet.task import Clock
    new_loop = Clock()
    calls = []
    with replace_loop(new_loop) as fake_loop:
        def foo(*args, **kw):
            calls.append((args, kw))

        delay = txaio.call_later(1, foo, 5, 6, 7, foo="bar")
        assert len(calls) == 0
        assert hasattr(delay, 'cancel')
        fake_loop.advance(2)

        assert len(calls) == 1
        assert calls[0][0] == (5, 6, 7)
        assert calls[0][1] == dict(foo="bar")


def test_call_later_aio(framework_aio):
    '''
    Wait for two Futures.
    '''

    # Trollius doesn't come with this, so won't work on py2
    pytest.importorskip('asyncio.test_utils')

    def time_gen():
        when = yield
        assert when == 1
        # even though we only do one call, I guess TestLoop needs
        # a "trailing" yield? "or something"
        when = yield 0
    from asyncio.test_utils import TestLoop
    new_loop = TestLoop(time_gen)

    calls = []
    with replace_loop(new_loop) as fake_loop:
        def foo(*args, **kw):
            calls.append((args, kw))

        delay = txaio.call_later(1, foo, 5, 6, 7, foo="bar")
        assert len(calls) == 0
        assert hasattr(delay, 'cancel')
        fake_loop.advance_time(2)
        fake_loop._run_once()

        assert len(calls) == 1
        assert calls[0][0] == (5, 6, 7)
        assert calls[0][1] == dict(foo="bar")