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# SPDX-License-Identifier: Apache-2.0
#
# 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
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import os
import sys
import unittest

import torch
from parameterized import parameterized

import tensorrt_llm
from tensorrt_llm import Tensor

sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
from utils.util import create_session, run_session, unittest_name_func


class TestSplit(unittest.TestCase):

    def setUp(self):
        tensorrt_llm.logger.set_level('error')

    @parameterized.expand([
        ('float32', 0, 4),
        ('float32', 1, 4),
        ('float32', -1, 4),
        ('float32', -2, 4),
        ('float16', 0, 4),
        ('float16', 1, 4),
        ('float16', -1, 4),
        ('float16', -2, 4),
        ('float32', 0, [2, 100, 26]),
        ('float32', 1, [2, 100, 100, 52, 2]),
        ('float32', -1, [2, 100, 100, 52, 2]),
        ('float32', -2, [2, 100, 26]),
        ('float16', 0, [2, 100, 26]),
        ('float16', 1, [2, 100, 100, 52, 2]),
        ('float16', -1, [2, 100, 100, 52, 2]),
        ('float16', -2, [2, 100, 26]),
    ],
                          name_func=unittest_name_func)
    def test_split(self, dtype, dim, split_size_or_sections):
        # test data
        x_shape = (128, 256)
        x_data = torch.rand(x_shape,
                            dtype=tensorrt_llm._utils.str_dtype_to_torch(dtype),
                            device="cuda")

        # construct trt network
        builder = tensorrt_llm.Builder()
        network = builder.create_network()
        with tensorrt_llm.net_guard(network):

            x = Tensor(name='x',
                       shape=x_shape,
                       dtype=tensorrt_llm.str_dtype_to_trt(dtype))

            outputs = tensorrt_llm.functional.split(x, split_size_or_sections,
                                                    dim)
            for i in range(len(outputs)):
                outputs[i].mark_output(f'output_{i}')

        # trt run
        session = create_session(builder, network, precision=dtype)
        inputs = {
            'x': x_data,
        }
        outputs = run_session(session, inputs)

        # pytorch run
        ref_outputs = torch.split(x_data, split_size_or_sections, dim)

        # compare diff
        assert len(outputs.keys()) == len(ref_outputs)
        for i in range(len(ref_outputs)):
            torch.testing.assert_close(ref_outputs[i], outputs[f'output_{i}'])