from sympy.core.compatibility import (default_sort_key, as_int, ordered,
    iterable, NotIterable)
from sympy.core.singleton import S
from sympy.utilities.pytest import raises

from sympy.abc import x


def test_default_sort_key():
    func = lambda x: x
    assert sorted([func, x, func], key=default_sort_key) == [func, func, x]


def test_as_int():
    raises(ValueError, lambda : as_int(1.1))
    raises(ValueError, lambda : as_int([]))
    raises(ValueError, lambda : as_int(S.NaN))
    raises(ValueError, lambda : as_int(S.Infinity))
    raises(ValueError, lambda : as_int(S.NegativeInfinity))
    raises(ValueError, lambda : as_int(S.ComplexInfinity))
    # for the following, limited precision makes int(arg) == arg
    # but the int value is not necessarily what a user might have
    # expected; Q.prime is more nuanced in its response for
    # expressions which might be complex representations of an
    # integer. This is not -- by design -- as_ints role.
    raises(ValueError, lambda : as_int(1e23))
    raises(ValueError, lambda : as_int(S('1.'+'0'*20+'1')))


def test_iterable():
    assert iterable(0) is False
    assert iterable(1) is False
    assert iterable(None) is False

    class Test1(NotIterable):
        pass

    assert iterable(Test1()) is False

    class Test2(NotIterable):
        _iterable = True

    assert iterable(Test2()) is True

    class Test3(object):
        pass

    assert iterable(Test3()) is False

    class Test4(object):
        _iterable = True

    assert iterable(Test4()) is True

    class Test5(object):
        def __iter__(self):
            yield 1

    assert iterable(Test5()) is True

    class Test6(Test5):
        _iterable = False

    assert iterable(Test6()) is False


def test_ordered():
    # Issue 7210 - this had been failing with python2/3 problems
    assert (list(ordered([{1:3, 2:4, 9:10}, {1:3}])) == \
               [{1: 3}, {1: 3, 2: 4, 9: 10}])
    # warnings should not be raised for identical items
    l = [1, 1]
    assert list(ordered(l, warn=True)) == l
    l = [[1], [2], [1]]
    assert list(ordered(l, warn=True)) == [[1], [1], [2]]
    raises(ValueError, lambda: list(ordered(['a', 'ab'], keys=[lambda x: x[0]],
        default=False, warn=True)))


def test_round():
    from sympy.core.compatibility import round
    # XXX delete this test when PY2 is dropped
    assert round(S(12.3)).is_Integer
    assert round(S(12.3), 0).is_Float
