import numpy as np
from skimage._shared.utils import safe_as_int
from skimage._shared import testing


def test_int_cast_not_possible():
    with testing.raises(ValueError):
        safe_as_int(7.1)
    with testing.raises(ValueError):
        safe_as_int([7.1, 0.9])
    with testing.raises(ValueError):
        safe_as_int(np.r_[7.1, 0.9])
    with testing.raises(ValueError):
        safe_as_int((7.1, 0.9))
    with testing.raises(ValueError):
        safe_as_int(((3, 4, 1), (2, 7.6, 289)))
    with testing.raises(ValueError):
        safe_as_int(7.1, 0.09)
    with testing.raises(ValueError):
        safe_as_int([7.1, 0.9], 0.09)
    with testing.raises(ValueError):
        safe_as_int(np.r_[7.1, 0.9], 0.09)
    with testing.raises(ValueError):
        safe_as_int((7.1, 0.9), 0.09)
    with testing.raises(ValueError):
        safe_as_int(((3, 4, 1), (2, 7.6, 289)), 0.25)


def test_int_cast_possible():
    testing.assert_equal(safe_as_int(7.1, atol=0.11), 7)
    testing.assert_equal(safe_as_int(-7.1, atol=0.11), -7)
    testing.assert_equal(safe_as_int(41.9, atol=0.11), 42)
    testing.assert_array_equal(
        safe_as_int([2, 42, 5789234.0, 87, 4]), np.r_[2, 42, 5789234, 87, 4]
    )
    testing.assert_array_equal(
        safe_as_int(
            np.r_[[[3, 4, 1.000000001], [7, 2, -8.999999999], [6, 9, -4234918347.0]]]
        ),
        np.r_[[[3, 4, 1], [7, 2, -9], [6, 9, -4234918347]]],
    )