#   Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
#
# 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 print_function

import unittest

import numpy as np
import paddle
import paddle.fluid as fluid
from paddle.fluid.framework import _test_eager_guard


class TestIncrement(unittest.TestCase):
    def test_api(self):
        with fluid.program_guard(fluid.Program(), fluid.Program()):
            input = fluid.layers.fill_constant(
                shape=[1], dtype='int64', value=5)
            expected_result = np.array([8], dtype='int64')

            output = paddle.tensor.math.increment(input, value=3)
            exe = fluid.Executor(fluid.CPUPlace())
            result = exe.run(fetch_list=[output])
            self.assertEqual((result == expected_result).all(), True)

        with fluid.dygraph.guard():
            input = paddle.ones(shape=[1], dtype='int64')
            expected_result = np.array([2], dtype='int64')
            output = paddle.tensor.math.increment(input, value=1)
            self.assertEqual((output.numpy() == expected_result).all(), True)

        with fluid.dygraph.guard():
            with _test_eager_guard():
                input = paddle.ones(shape=[1], dtype='int64')
                expected_result = np.array([2], dtype='int64')
                output = paddle.tensor.math.increment(input, value=1)
                self.assertEqual((output.numpy() == expected_result).all(),
                                 True)


class TestInplaceApiWithDataTransform(unittest.TestCase):
    def test_increment(self):
        if fluid.core.is_compiled_with_cuda():
            paddle.enable_static()
            with paddle.fluid.device_guard("gpu:0"):
                x = paddle.fluid.layers.fill_constant([1], "float32", 0)
            with paddle.fluid.device_guard("cpu"):
                x = paddle.increment(x)
            exe = paddle.static.Executor(paddle.CUDAPlace(0))
            a, = exe.run(paddle.static.default_main_program(), fetch_list=[x])
            paddle.disable_static()
            self.assertEqual(a[0], 1)


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