import unittest

from reactivex import operators as _
from reactivex.testing import ReactiveTest, TestScheduler

on_next = ReactiveTest.on_next
on_completed = ReactiveTest.on_completed
on_error = ReactiveTest.on_error
subscribe = ReactiveTest.subscribe
subscribed = ReactiveTest.subscribed
disposed = ReactiveTest.disposed
created = ReactiveTest.created


class TestCount(unittest.TestCase):
    def test_count_empty(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(on_next(150, 1), on_completed(250))
        res = scheduler.start(create=lambda: xs.pipe(_.count())).messages
        assert res == [on_next(250, 0), on_completed(250)]

    def test_count_empty_ii(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1), on_next(210, 2), on_completed(250)
        )

        def create():
            return xs.pipe(_.count())

        res = scheduler.start(create=create).messages
        assert res == [on_next(250, 1), on_completed(250)]

    def test_count_some(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1),
            on_next(210, 2),
            on_next(220, 3),
            on_next(230, 4),
            on_completed(250),
        )
        res = scheduler.start(create=lambda: xs.pipe(_.count())).messages
        assert res == [on_next(250, 3), on_completed(250)]

    def test_count_on_error(self):
        ex = "ex"
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(on_next(150, 1), on_error(210, ex))
        res = scheduler.start(create=lambda: xs.pipe(_.count())).messages
        assert res == [on_error(210, ex)]

    def test_count_never(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(on_next(150, 1))
        res = scheduler.start(create=lambda: xs.pipe(_.count())).messages
        assert res == []

    def test_count_predicate_empty_true(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(on_next(150, 1), on_completed(250))

        def create():
            return xs.pipe(_.count(lambda _: True))

        res = scheduler.start(create=create)

        assert res.messages == [on_next(250, 0), on_completed(250)]
        assert xs.subscriptions == [subscribe(200, 250)]

    def test_count_predicate_empty_false(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(on_next(150, 1), on_completed(250))

        def create():
            return xs.pipe(_.count(lambda _: False))

        res = scheduler.start(create=create)

        assert res.messages == [on_next(250, 0), on_completed(250)]
        assert xs.subscriptions == [subscribe(200, 250)]

    def test_count_predicate_return_true(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1), on_next(210, 2), on_completed(250)
        )

        def create():
            return xs.pipe(_.count(lambda _: True))

        res = scheduler.start(create=create)

        assert res.messages == [on_next(250, 1), on_completed(250)]
        assert xs.subscriptions == [subscribe(200, 250)]

    def test_count_predicate_return_false(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1), on_next(210, 2), on_completed(250)
        )

        def create():
            return xs.pipe(_.count(lambda _: False))

        res = scheduler.start(create=create)

        assert res.messages == [on_next(250, 0), on_completed(250)]
        assert xs.subscriptions == [subscribe(200, 250)]

    def test_count_predicate_some_all(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1),
            on_next(210, 2),
            on_next(220, 3),
            on_next(230, 4),
            on_completed(250),
        )

        def create():
            return xs.pipe(_.count(lambda x: x < 10))

        res = scheduler.start(create=create)

        assert res.messages == [on_next(250, 3), on_completed(250)]
        assert xs.subscriptions == [subscribe(200, 250)]

    def test_count_predicate_some_none(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1),
            on_next(210, 2),
            on_next(220, 3),
            on_next(230, 4),
            on_completed(250),
        )

        def create():
            return xs.pipe(_.count(lambda x: x > 10))

        res = scheduler.start(create=create)

        assert res.messages == [on_next(250, 0), on_completed(250)]
        assert xs.subscriptions == [subscribe(200, 250)]

    def test_count_predicate_some_even(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1),
            on_next(210, 2),
            on_next(220, 3),
            on_next(230, 4),
            on_completed(250),
        )

        def create():
            return xs.pipe(_.count(lambda x: x % 2 == 0))

        res = scheduler.start(create=create)

        assert res.messages == [on_next(250, 2), on_completed(250)]
        assert xs.subscriptions == [subscribe(200, 250)]

    def test_count_predicate_throw_true(self):
        ex = "ex"
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(on_next(150, 1), on_error(210, ex))

        def create():
            return xs.pipe(_.count(lambda _: True))

        res = scheduler.start(create=create)

        assert res.messages == [on_error(210, ex)]
        assert xs.subscriptions == [subscribe(200, 210)]

    def test_count_predicate_throw_false(self):
        ex = "ex"
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(on_next(150, 1), on_error(210, ex))

        def create():
            return xs.pipe(_.count(lambda _: False))

        res = scheduler.start(create=create)

        assert res.messages == [on_error(210, ex)]
        assert xs.subscriptions == [subscribe(200, 210)]

    def test_count_predicate_never(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(on_next(150, 1))

        def create():
            return xs.pipe(_.count(lambda _: True))

        res = scheduler.start(create=create)

        assert res.messages == []
        assert xs.subscriptions == [subscribe(200, 1000)]

    def test_count_predicate_predicate_throws(self):
        ex = "ex"
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1), on_next(210, 2), on_next(230, 3), on_completed(240)
        )

        def create():
            def predicate(x):
                if x == 3:
                    raise Exception(ex)
                else:
                    return True

            return xs.pipe(_.count(predicate))

        res = scheduler.start(create=create)

        assert res.messages == [on_error(230, ex)]
        assert xs.subscriptions == [subscribe(200, 230)]