# Tencent is pleased to support the open source community by making ncnn available.
#
# Copyright (C) 2022 THL A29 Limited, a Tencent company. All rights reserved.
#
# Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
# in compliance with the License. You may obtain a copy of the License at
#
# https://opensource.org/licenses/BSD-3-Clause
#
# 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 torch
import torch.nn as nn
import torch.nn.functional as F

class Model(nn.Module):
    def __init__(self):
        super(Model, self).__init__()

        self.pad_0 = nn.ConstantPad2d(2, 0.0)
        self.pad_1 = nn.ReflectionPad2d(4)
        self.pad_2 = nn.ReplicationPad2d(3)
        self.pad_3 = nn.ZeroPad2d((1,1,0,0))

        self.conv_0 = nn.Conv2d(in_channels=12, out_channels=14, kernel_size=3)
        self.conv_1 = nn.Conv2d(in_channels=14, out_channels=14, kernel_size=1)
        self.conv_2 = nn.Conv2d(in_channels=14, out_channels=14, kernel_size=2)
        self.conv_3 = nn.Conv2d(in_channels=14, out_channels=12, kernel_size=3, padding=(1,1))

    def forward(self, x):
        x = self.pad_0(x)
        x = F.pad(x, pad=(1,1))
        x = self.conv_0(x)

        x = self.pad_1(x)
        x = self.conv_1(x)

        x = F.pad(x, pad=(3,3,2,2), mode='reflect')
        x = self.conv_1(x)

        x = self.pad_2(x)
        x = self.conv_2(x)

        x = F.pad(x, pad=(1,1,1,1), mode='replicate')
        x = self.conv_2(x)

        x = self.pad_3(x)
        x = F.pad(x, pad=(2,2,0,0))
        x = self.conv_3(x)

        return x

def test():
    net = Model()
    net.eval()

    torch.manual_seed(0)
    x = torch.rand(1, 12, 13, 13)

    a = net(x)

    # export torchscript
    mod = torch.jit.trace(net, x)
    mod.save("test_pnnx_pnnx_fuse_pad_conv2d.pt")

    # torchscript to pnnx
    import os
    os.system("../src/pnnx test_pnnx_pnnx_fuse_pad_conv2d.pt inputshape=[1,12,13,13]")

    # pnnx inference
    import test_pnnx_pnnx_fuse_pad_conv2d_pnnx
    b = test_pnnx_pnnx_fuse_pad_conv2d_pnnx.test_inference()

    for a0, b0 in zip(a, b):
        if not torch.equal(a0, b0):
            return False
    return True

if __name__ == "__main__":
    if test():
        exit(0)
    else:
        exit(1)
