# Copyright (c) MONAI Consortium
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#     http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import annotations

import unittest

import torch
from parameterized import parameterized

from monai.utils import sample_slices
from tests.test_utils import TEST_NDARRAYS, assert_allclose

# test data[:, [1, ], ...]
TEST_CASE_1 = [torch.tensor([[[0, 2], [1, 0]]]), 1, True, (1,), torch.tensor([[[1, 0]]])]
# test data[:, [0, 2], ...]
TEST_CASE_2 = [torch.tensor([[[0, 2], [1, 0], [4, 5]]]), 1, True, (0, 2), torch.tensor([[[0, 2], [4, 5]]])]
# test data[:, [0: 2], ...]
TEST_CASE_3 = [torch.tensor([[[0, 2], [1, 0], [4, 5]]]), 1, False, (0, 2), torch.tensor([[[0, 2], [1, 0]]])]
# test data[:, [1: ], ...]
TEST_CASE_4 = [torch.tensor([[[0, 2], [1, 0], [4, 5]]]), 1, False, (1, None), torch.tensor([[[1, 0], [4, 5]]])]
# test data[:, [0: 3: 2], ...]
TEST_CASE_5 = [torch.tensor([[[0, 2], [1, 0], [4, 5]]]), 1, False, (0, 3, 2), torch.tensor([[[0, 2], [4, 5]]])]


class TestSampleSlices(unittest.TestCase):
    @parameterized.expand([TEST_CASE_1, TEST_CASE_2, TEST_CASE_3, TEST_CASE_4, TEST_CASE_5])
    def test_shape(self, input_data, dim, as_indices, vals, expected_result):
        for p in TEST_NDARRAYS:
            result = sample_slices(p(input_data), dim, as_indices, *vals)
            assert_allclose(p(expected_result), result)


if __name__ == "__main__":
    unittest.main()
