# This file is part of Hypothesis, which may be found at
# https://github.com/HypothesisWorks/hypothesis/
#
# Most of this work is copyright (C) 2013-2020 David R. MacIver
# (david@drmaciver.com), but it contains contributions by others. See
# CONTRIBUTING.rst for a full list of people who may hold copyright, and
# consult the git log if you need to determine who owns an individual
# contribution.
#
# This Source Code Form is subject to the terms of the Mozilla Public License,
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
# obtain one at https://mozilla.org/MPL/2.0/.
#
# END HEADER

import pytest
from _pytest.outcomes import Failed, Skipped

from hypothesis import find, given, reject, settings, strategies as s
from hypothesis.errors import InvalidArgument, NoSuchExample, Unsatisfiable


def test_stops_after_max_examples_if_satisfying():
    tracker = []

    def track(x):
        tracker.append(x)
        return False

    max_examples = 100

    with pytest.raises(NoSuchExample):
        find(s.integers(0, 10000), track, settings=settings(max_examples=max_examples))

    assert len(tracker) == max_examples


def test_stops_after_ten_times_max_examples_if_not_satisfying():
    count = [0]

    def track(x):
        count[0] += 1
        reject()

    max_examples = 100

    with pytest.raises(Unsatisfiable):
        find(s.integers(0, 10000), track, settings=settings(max_examples=max_examples))

    # Very occasionally we can generate overflows in generation, which also
    # count towards our example budget, which means that we don't hit the
    # maximum.
    assert count[0] <= 10 * max_examples


some_normal_settings = settings()


def test_is_not_normally_default():
    assert settings.default is not some_normal_settings


@given(s.booleans())
@some_normal_settings
def test_settings_are_default_in_given(x):
    assert settings.default is some_normal_settings


def test_given_shrinks_pytest_helper_errors():
    final_value = [None]

    @settings(derandomize=True, max_examples=100)
    @given(s.integers())
    def inner(x):
        final_value[0] = x
        if x > 100:
            pytest.fail("x=%r is too big!" % x)

    with pytest.raises(Failed):
        inner()
    assert final_value[0] == 101


def test_pytest_skip_skips_shrinking():
    values = []

    @settings(derandomize=True, max_examples=100)
    @given(s.integers())
    def inner(x):
        values.append(x)
        if x > 100:
            pytest.skip("x=%r is too big!" % x)

    with pytest.raises(Skipped):
        inner()
    assert len([x for x in values if x > 100]) == 1


def test_can_find_with_db_eq_none():
    find(s.integers(), bool, settings=settings(database=None, max_examples=100))


def test_no_such_example():
    with pytest.raises(NoSuchExample):
        find(s.none(), bool, database_key=b"no such example")


def test_validates_strategies_for_test_method():
    invalid_strategy = s.lists(s.nothing(), min_size=1)

    class TestStrategyValidation:
        @given(invalid_strategy)
        def test_method_with_bad_strategy(self, x):
            pass

    instance = TestStrategyValidation()
    with pytest.raises(InvalidArgument):
        instance.test_method_with_bad_strategy()