# Copyright 2019 Huawei Technologies Co., Ltd
#
# 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 numpy as np
import pytest

import mindspore.context as context
import mindspore.nn as nn
from mindspore import Tensor
from mindspore.ops import operations as P

context.set_context(mode=context.GRAPH_MODE, device_target="CPU")

class NetGatherD(nn.Cell):
    def __init__(self, dim=1):
        super(NetGatherD, self).__init__()
        self.gatherd = P.GatherD()
        self.dim = int(dim)

    def construct(self, x, index):
        return self.gatherd(x, self.dim, index)


@pytest.mark.level0
@pytest.mark.platform_x86_cpu
@pytest.mark.env_onecard
def test_gatherd_fp32():
    prop = 100 if np.random.random() > 0.5 else -100
    x = np.random.randn(5, 5, 5).astype(np.float32) * prop
    index = np.random.randint(0, 5, (5, 3, 5)).astype(np.int32)
    dim = 1

    gatherd = NetGatherD(dim)
    output = gatherd(Tensor(x), Tensor(index))

    expect = np.zeros(index.shape).astype(np.float32)
    for i in range(index.shape[0]):
        for j in range(index.shape[1]):
            for k in range(index.shape[2]):
                expect[i, j, k] = x[i, index[i, j, k], k]
    error = np.ones(shape=expect.shape) * 1.0e-6
    assert np.all(np.abs(output.asnumpy() - expect) < error)


@pytest.mark.level0
@pytest.mark.platform_x86_cpu
@pytest.mark.env_onecard
def test_gatherd_fp16():
    prop = 100 if np.random.random() > 0.5 else -100
    x = np.random.randn(5, 5, 5).astype(np.float16) * prop
    index = np.random.randint(0, 5, (3, 5, 5)).astype(np.int64)
    dim = 0

    gatherd = NetGatherD(dim)
    output = gatherd(Tensor(x), Tensor(index))

    expect = np.zeros(index.shape).astype(np.float16)
    for i in range(index.shape[0]):
        for j in range(index.shape[1]):
            for k in range(index.shape[2]):
                expect[i, j, k] = x[index[i, j, k], j, k]
    error = np.ones(shape=expect.shape) * 1.0e-6
    assert np.all(np.abs(output.asnumpy() - expect) < error)



@pytest.mark.level0
@pytest.mark.platform_x86_cpu
@pytest.mark.env_onecard
def test_gatherd_int32():
    prop = 100 if np.random.random() > 0.5 else -100
    x = np.random.randn(5, 5, 5).astype(np.int32) * prop
    index = np.random.randint(0, 5, (5, 5, 8)).astype(np.int32)
    dim = -1

    gatherd = NetGatherD(dim)
    output = gatherd(Tensor(x), Tensor(index))

    expect = np.zeros(index.shape).astype(np.int32)
    for i in range(index.shape[0]):
        for j in range(index.shape[1]):
            for k in range(index.shape[2]):
                expect[i, j, k] = x[i, j, index[i, j, k]]
    assert np.all(output.asnumpy() == expect)


@pytest.mark.level0
@pytest.mark.platform_x86_cpu
@pytest.mark.env_onecard
def test_gatherd_bool():
    prop = 100 if np.random.random() > 0.5 else -100
    x = np.random.randn(5, 5, 5).astype(np.int32) * prop
    x = (x >= 0).astype(np.bool)
    index = np.random.randint(0, 5, (5, 5, 8)).astype(np.int32)
    dim = -1

    gatherd = NetGatherD(dim)
    output = gatherd(Tensor(x), Tensor(index))

    expect = np.zeros(index.shape).astype(np.bool)
    for i in range(index.shape[0]):
        for j in range(index.shape[1]):
            for k in range(index.shape[2]):
                expect[i, j, k] = x[i, j, index[i, j, k]]
    assert np.all(output.asnumpy() == expect)