# Copyright 2020 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.
# ============================================================================
"""
test psnr
"""
import numpy as np
import pytest
import mindspore.nn as nn
from mindspore.common.api import _executor
from mindspore import Tensor


class PSNRNet(nn.Cell):
    def __init__(self, max_val=1.0):
        super(PSNRNet, self).__init__()
        self.net = nn.PSNR(max_val)

    def construct(self, img1, img2):
        return self.net(img1, img2)


def test_compile_psnr():
    max_val = 1.0
    net = PSNRNet(max_val)
    img1 = Tensor(np.random.random((8, 3, 16, 16)))
    img2 = Tensor(np.random.random((8, 3, 16, 16)))
    _executor.compile(net, img1, img2)

def test_compile_psnr_grayscale():
    max_val = 255
    net = PSNRNet(max_val)
    img1 = Tensor(np.random.randint(0, 256, (8, 1, 16, 16), np.uint8))
    img2 = Tensor(np.random.randint(0, 256, (8, 1, 16, 16), np.uint8))
    _executor.compile(net, img1, img2)

def test_psnr_max_val_negative():
    max_val = -1
    with pytest.raises(ValueError):
        net = PSNRNet(max_val)

def test_psnr_max_val_bool():
    max_val = True
    with pytest.raises(TypeError):
        net = PSNRNet(max_val)

def test_psnr_max_val_zero():
    max_val = 0
    with pytest.raises(ValueError):
        net = PSNRNet(max_val)
