# 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.transforms import VoteEnsembled
from tests.test_utils import TEST_NDARRAYS, assert_allclose

TESTS = []
for p in TEST_NDARRAYS:
    # shape: [1, 2, 1, 1]
    TESTS.append(
        [
            {"keys": ["pred0", "pred1", "pred2"], "output_key": "output", "num_classes": None},
            {
                "pred0": p(torch.tensor([[[[1]], [[0]]]])),
                "pred1": p(torch.tensor([[[[1]], [[0]]]])),
                "pred2": p(torch.tensor([[[[0]], [[1]]]])),
            },
            p(torch.tensor([[[[1.0]], [[0.0]]]])),
        ]
    )

    # shape: [1, 2, 1, 1]
    TESTS.append(
        [
            {"keys": "output", "output_key": "output", "num_classes": None},
            {
                "output": p(
                    torch.stack(
                        [torch.tensor([[[[1]], [[0]]]]), torch.tensor([[[[1]], [[0]]]]), torch.tensor([[[[0]], [[1]]]])]
                    )
                )
            },
            p(torch.tensor([[[[1.0]], [[0.0]]]])),
        ]
    )

    # shape: [1, 2, 1]
    TESTS.append(
        [
            {"keys": ["pred0", "pred1", "pred2"], "output_key": "output", "num_classes": 3},
            {
                "pred0": p(torch.tensor([[[0], [2]]])),
                "pred1": p(torch.tensor([[[0], [2]]])),
                "pred2": p(torch.tensor([[[1], [1]]])),
            },
            p(torch.tensor([[[0], [2]]])),
        ]
    )

    # shape: [1, 2, 1]
    TESTS.append(
        [
            {"keys": ["pred0", "pred1", "pred2"], "output_key": "output", "num_classes": 5},
            {
                "pred0": p(torch.tensor([[[0], [2]]])),
                "pred1": p(torch.tensor([[[0], [2]]])),
                "pred2": p(torch.tensor([[[1], [1]]])),
            },
            p(torch.tensor([[[0], [2]]])),
        ]
    )

    # shape: [1]
    TESTS.append(
        [
            {"keys": ["pred0", "pred1", "pred2"], "output_key": "output", "num_classes": 3},
            {"pred0": p(torch.tensor([2])), "pred1": p(torch.tensor([2])), "pred2": p(torch.tensor([1]))},
            p(torch.tensor([2])),
        ]
    )


class TestVoteEnsembled(unittest.TestCase):
    @parameterized.expand(TESTS)
    def test_value(self, input_param, img, expected_value):
        result = VoteEnsembled(**input_param)(img)
        assert_allclose(result["output"], expected_value)

    def test_cuda_value(self):
        img = torch.stack(
            [torch.tensor([[[[1]], [[0]]]]), torch.tensor([[[[1]], [[0]]]]), torch.tensor([[[[0]], [[1]]]])]
        )
        expected_value = torch.tensor([[[[1.0]], [[0.0]]]])
        if torch.cuda.is_available():
            img = img.to(torch.device("cuda:0"))
            expected_value = expected_value.to(torch.device("cuda:0"))
        result = VoteEnsembled(keys="output", num_classes=None)({"output": img})
        assert_allclose(result["output"], expected_value)


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