import numpy as np
import pytest
from pylibraft.common import device_ndarray


@pytest.mark.parametrize("order", ["F", "C"])
@pytest.mark.parametrize("dtype", [np.float32, np.float64])
def test_basic_attributes(order, dtype):

    a = np.random.random((500, 2)).astype(dtype)

    if order == "C":
        a = np.ascontiguousarray(a)
    else:
        a = np.asfortranarray(a)

    db = device_ndarray(a)
    db_host = db.copy_to_host()

    assert a.shape == db.shape
    assert a.dtype == db.dtype
    assert a.data.f_contiguous == db.f_contiguous
    assert a.data.f_contiguous == db_host.data.f_contiguous
    assert a.data.c_contiguous == db.c_contiguous
    assert a.data.c_contiguous == db_host.data.c_contiguous
    np.testing.assert_array_equal(a.tolist(), db_host.tolist())


@pytest.mark.parametrize("order", ["F", "C"])
@pytest.mark.parametrize("dtype", [np.float32, np.float64])
def test_empty(order, dtype):

    a = np.random.random((500, 2)).astype(dtype)
    if order == "C":
        a = np.ascontiguousarray(a)
    else:
        a = np.asfortranarray(a)

    db = device_ndarray.empty(a.shape, dtype=dtype, order=order)
    db_host = db.copy_to_host()

    assert a.shape == db.shape
    assert a.dtype == db.dtype
    assert a.data.f_contiguous == db.f_contiguous
    assert a.data.f_contiguous == db_host.data.f_contiguous
    assert a.data.c_contiguous == db.c_contiguous
    assert a.data.c_contiguous == db_host.data.c_contiguous
