#   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.

import unittest

import paddle

DELTA = 0.00001


class TestIsTensorApi(unittest.TestCase):
    def setUp(self):
        paddle.disable_static()

    def tearDown(self):
        paddle.enable_static()

    def test_is_tensor_real(self, dtype="float32"):
        """Test is_tensor api with a real tensor"""
        x = paddle.rand([3, 2, 4], dtype=dtype)
        self.assertTrue(paddle.is_tensor(x))

    def test_is_tensor_list(self, dtype="float32"):
        """Test is_tensor api with a list"""
        x = [1, 2, 3]
        self.assertFalse(paddle.is_tensor(x))

    def test_is_tensor_number(self, dtype="float32"):
        """Test is_tensor api with a number"""
        x = 5
        self.assertFalse(paddle.is_tensor(x))


class TestIsTensorStatic(unittest.TestCase):
    def setUp(self):
        paddle.enable_static()

    def tearDown(self):
        paddle.disable_static()

    def test_is_tensor(self):
        x = paddle.rand([3, 2, 4], dtype='float32')
        self.assertTrue(paddle.is_tensor(x))

    def test_is_tensor_array(self):
        x = paddle.tensor.create_array('float32')
        self.assertTrue(paddle.is_tensor(x))


class TestIsTensorCompatibility(unittest.TestCase):
    def setUp(self):
        self.data = []
        self.data.append({'data': paddle.rand([3, 2, 4]), 'expected': True})
        self.data.append({'data': [1, 2, 3], 'expected': False})
        self.data.append({'data': 5, 'expected': False})

    def test_dygraph_Compatibility(self):
        paddle.disable_static()

        for case in self.data:
            data = case['data']

            result_x = paddle.is_tensor(x=data)
            result_obj = paddle.is_tensor(obj=data)

            self.assertEqual(result_x, result_obj)
            self.assertEqual(result_x, case['expected'])

        paddle.enable_static()

    def test_static_Compatibility(self):
        paddle.enable_static()
        for case in self.data:
            data = case['data']

            result_x = paddle.is_tensor(x=data)
            result_obj = paddle.is_tensor(obj=data)

            self.assertEqual(result_x, result_obj)
            self.assertEqual(result_x, case['expected'])


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