import unittest

from reactivex import operators as ops
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 TestFind(unittest.TestCase):
    def test_find_never(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(on_next(150, 1))

        def create():
            return xs.pipe(ops.find(lambda x, i, s: True))

        res = scheduler.start(create)

        assert res.messages == []

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

        def create():
            return xs.pipe(ops.find(lambda x, i, s: True))

        res = scheduler.start(create)

        assert res.messages == [on_next(210, None), on_completed(210)]

    def test_find_single(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1), on_next(210, 2), on_completed(220)
        )

        def create():
            return xs.pipe(ops.find(lambda x, i, s: x == 2))

        res = scheduler.start(create)

        assert res.messages == [on_next(210, 2), on_completed(210)]

    def test_find_notfound(self):
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1), on_next(210, 2), on_completed(220)
        )

        def create():
            return xs.pipe(ops.find(lambda x, i, s: x == 3))

        res = scheduler.start(create)

        assert res.messages == [on_next(220, None), on_completed(220)]

    def test_find_Error(self):
        ex = Exception("error")
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1), on_next(210, 2), on_error(220, ex)
        )

        def create():
            return xs.pipe(ops.find(lambda x, i, s: x == 3))

        res = scheduler.start(create)

        assert res.messages == [on_error(220, ex)]

    def test_find_throws(self):
        ex = "error"
        scheduler = TestScheduler()
        xs = scheduler.create_hot_observable(
            on_next(150, 1), on_next(210, 2), on_completed(220)
        )

        def create():
            def predicate(x, i, source):
                raise Exception(ex)

            return xs.pipe(ops.find(predicate))

        res = scheduler.start(create)

        assert res.messages == [on_error(210, ex)]