#   Copyright (c) 2018 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
from op_test import OpTest

import paddle.fluid.core as core
from paddle.fluid.op import Operator
import paddle.fluid as fluid
import paddle.tensor as tensor
from paddle.fluid import compiler, Program, program_guard


# Test python API
class TestFullAPI(unittest.TestCase):
    def test_api(self):
        positive_2_int32 = fluid.layers.fill_constant([1], "int32", 2)

        positive_2_int64 = fluid.layers.fill_constant([1], "int64", 2)
        shape_tensor_int32 = fluid.data(
            name="shape_tensor_int32", shape=[2], dtype="int32")

        shape_tensor_int64 = fluid.data(
            name="shape_tensor_int64", shape=[2], dtype="int64")

        out_1 = tensor.full(
            shape=[1, 2], dtype="float32", fill_value=1.1, device='gpu')

        out_2 = tensor.full(
            shape=[1, positive_2_int32],
            dtype="float32",
            fill_value=1.1,
            device='cpu')

        out_3 = tensor.full(
            shape=[1, positive_2_int64],
            dtype="float32",
            fill_value=1.1,
            device='gpu')

        out_4 = tensor.full(
            shape=shape_tensor_int32,
            dtype="float32",
            fill_value=1.2,
            out=out_3)

        out_5 = tensor.full(
            shape=shape_tensor_int64,
            dtype="float32",
            fill_value=1.1,
            device='gpu',
            stop_gradient=False)

        out_6 = tensor.full(
            shape=shape_tensor_int64, dtype=np.float32, fill_value=1.1)

        exe = fluid.Executor(place=fluid.CPUPlace())
        res_1, res_2, res_3, res_4, res_5, res_6 = exe.run(
            fluid.default_main_program(),
            feed={
                "shape_tensor_int32": np.array([1, 2]).astype("int32"),
                "shape_tensor_int64": np.array([1, 2]).astype("int64"),
            },
            fetch_list=[out_1, out_2, out_3, out_4, out_5, out_6])

        assert np.array_equal(res_1, np.full([1, 2], 1.1, dtype="float32"))
        assert np.array_equal(res_2, np.full([1, 2], 1.1, dtype="float32"))
        assert np.array_equal(res_3, np.full([1, 2], 1.2, dtype="float32"))
        assert np.array_equal(res_4, np.full([1, 2], 1.2, dtype="float32"))
        assert np.array_equal(res_5, np.full([1, 2], 1.1, dtype="float32"))
        assert np.array_equal(res_6, np.full([1, 2], 1.1, dtype="float32"))


class TestFullOpError(unittest.TestCase):
    def test_errors(self):
        with program_guard(Program(), Program()):
            #for ci coverage
            x1 = fluid.layers.data(name='x1', shape=[1], dtype="int16")
            self.assertRaises(
                ValueError, tensor.full, shape=[1], fill_value=5, dtype='uint4')
            self.assertRaises(
                TypeError,
                tensor.full,
                shape=[1],
                fill_value=5,
                dtype='int16',
                out=x1)

            # The argument dtype of full must be one of bool, float16,
            #float32, float64, int32 or int64
            x2 = fluid.layers.data(name='x2', shape=[1], dtype="int32")

            self.assertRaises(
                TypeError, tensor.full, shape=[1], fill_value=5, dtype='uint8')

            # The argument shape's type of full_op  must be list, tuple or Variable.
            def test_shape_type():
                tensor.full(shape=1, dtype="float32", fill_value=1)

            self.assertRaises(TypeError, test_shape_type)

            # The argument shape's size of full_op must not be 0.
            def test_shape_size():
                tensor.full(shape=[], dtype="float32", fill_value=1)

            self.assertRaises(AssertionError, test_shape_size)

            # The shape dtype of full op must be int32 or int64.
            def test_shape_tensor_dtype():
                shape = fluid.data(
                    name="shape_tensor", shape=[2], dtype="float32")
                tensor.full(shape=shape, dtype="float32", fill_value=1)

            self.assertRaises(TypeError, test_shape_tensor_dtype)

            def test_shape_tensor_list_dtype():
                shape = fluid.data(
                    name="shape_tensor_list", shape=[1], dtype="bool")
                tensor.full(shape=[shape, 2], dtype="float32", fill_value=1)

            self.assertRaises(TypeError, test_shape_tensor_list_dtype)


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