import pytest
import os
import ctypes
from pathlib import Path
from spacy import util
from spacy import prefer_gpu, require_gpu
from spacy.ml._precomputable_affine import PrecomputableAffine, _backprop_precomputable_affine_padding


@pytest.fixture
def is_admin():
    """Determine if the tests are run as admin or not."""
    try:
        admin = os.getuid() == 0
    except AttributeError:
        admin = ctypes.windll.shell32.IsUserAnAdmin() != 0

    return admin


@pytest.mark.parametrize("text", ["hello/world", "hello world"])
def test_util_ensure_path_succeeds(text):
    path = util.ensure_path(text)
    assert isinstance(path, Path)


@pytest.mark.parametrize("package", ["numpy"])
def test_util_is_package(package):
    """Test that an installed package via pip is recognised by util.is_package."""
    assert util.is_package(package)


@pytest.mark.parametrize("package", ["thinc"])
def test_util_get_package_path(package):
    """Test that a Path object is returned for a package name."""
    path = util.get_package_path(package)
    assert isinstance(path, Path)


def test_PrecomputableAffine(nO=4, nI=5, nF=3, nP=2):
    model = PrecomputableAffine(nO=nO, nI=nI, nF=nF, nP=nP)
    assert model.get_param("W").shape == (nF, nO, nP, nI)
    tensor = model.ops.alloc((10, nI))
    Y, get_dX = model.begin_update(tensor)
    assert Y.shape == (tensor.shape[0] + 1, nF, nO, nP)
    dY = model.ops.alloc((15, nO, nP))
    ids = model.ops.alloc((15, nF))
    ids[1, 2] = -1
    dY[1] = 1
    assert not model.has_grad("pad")
    d_pad = _backprop_precomputable_affine_padding(model, dY, ids)
    assert d_pad[0, 2, 0, 0] == 1.0
    ids.fill(0.0)
    dY.fill(0.0)
    dY[0] = 0
    ids[1, 2] = 0
    ids[1, 1] = -1
    ids[1, 0] = -1
    dY[1] = 1
    ids[2, 0] = -1
    dY[2] = 5
    d_pad = _backprop_precomputable_affine_padding(model, dY, ids)
    assert d_pad[0, 0, 0, 0] == 6
    assert d_pad[0, 1, 0, 0] == 1
    assert d_pad[0, 2, 0, 0] == 0


def test_prefer_gpu():
    try:
        import cupy  # noqa: F401
    except ImportError:
        assert not prefer_gpu()


def test_require_gpu():
    try:
        import cupy  # noqa: F401
    except ImportError:
        with pytest.raises(ValueError):
            require_gpu()


def test_ascii_filenames():
    """Test that all filenames in the project are ASCII.
    See: https://twitter.com/_inesmontani/status/1177941471632211968
    """
    root = Path(__file__).parent.parent
    for path in root.glob("**/*"):
        assert all(ord(c) < 128 for c in path.name), path.name