// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
//
// Copyright (C) 2017, Intel Corporation, all rights reserved.
// Third party copyrights are property of their respective owners.

#include "test_precomp.hpp"

#include <opencv2/dnn/layer.details.hpp>  // CV_DNN_REGISTER_LAYER_CLASS

namespace opencv_test { namespace {

TEST(blobFromImage_4ch, Regression)
{
    Mat ch[4];
    for(int i = 0; i < 4; i++)
        ch[i] = Mat::ones(10, 10, CV_8U)*i;

    Mat img;
    merge(ch, 4, img);
    Mat blob = dnn::blobFromImage(img, 1., Size(), Scalar(), false, false);

    for(int i = 0; i < 4; i++)
    {
        ch[i] = Mat(img.rows, img.cols, CV_32F, blob.ptr(0, i));
        ASSERT_DOUBLE_EQ(cvtest::norm(ch[i], cv::NORM_INF), i);
    }
}

TEST(blobFromImage, allocated)
{
    int size[] = {1, 3, 4, 5};
    Mat img(size[2], size[3], CV_32FC(size[1]));
    Mat blob(4, size, CV_32F);
    void* blobData = blob.data;
    dnn::blobFromImage(img, blob, 1.0 / 255, Size(), Scalar(), false, false);
    ASSERT_EQ(blobData, blob.data);
}

TEST(imagesFromBlob, Regression)
{
    int nbOfImages = 8;

    std::vector<cv::Mat> inputImgs(nbOfImages);
    for (int i = 0; i < nbOfImages; i++)
    {
        inputImgs[i] = cv::Mat::ones(100, 100, CV_32FC3);
        cv::randu(inputImgs[i], cv::Scalar::all(0), cv::Scalar::all(1));
    }

    cv::Mat blob = cv::dnn::blobFromImages(inputImgs, 1., cv::Size(), cv::Scalar(), false, false);
    std::vector<cv::Mat> outputImgs;
    cv::dnn::imagesFromBlob(blob, outputImgs);

    for (int i = 0; i < nbOfImages; i++)
    {
        ASSERT_EQ(cv::countNonZero(inputImgs[i] != outputImgs[i]), 0);
    }
}

TEST(readNet, Regression)
{
    Net net = readNet(findDataFile("dnn/squeezenet_v1.1.prototxt", false),
                      findDataFile("dnn/squeezenet_v1.1.caffemodel", false));
    EXPECT_FALSE(net.empty());
    net = readNet(findDataFile("dnn/opencv_face_detector.caffemodel", false),
                  findDataFile("dnn/opencv_face_detector.prototxt", false));
    EXPECT_FALSE(net.empty());
    net = readNet(findDataFile("dnn/openface_nn4.small2.v1.t7", false));
    EXPECT_FALSE(net.empty());
    net = readNet(findDataFile("dnn/tiny-yolo-voc.cfg", false),
                  findDataFile("dnn/tiny-yolo-voc.weights", false));
    EXPECT_FALSE(net.empty());
    net = readNet(findDataFile("dnn/ssd_mobilenet_v1_coco.pbtxt", false),
                  findDataFile("dnn/ssd_mobilenet_v1_coco.pb", false));
    EXPECT_FALSE(net.empty());
}

class FirstCustomLayer CV_FINAL : public Layer
{
public:
    FirstCustomLayer(const LayerParams &params) : Layer(params) {}

    static Ptr<Layer> create(LayerParams& params)
    {
        return Ptr<Layer>(new FirstCustomLayer(params));
    }

    virtual void forward(InputArrayOfArrays, OutputArrayOfArrays, OutputArrayOfArrays) CV_OVERRIDE {}
    virtual void forward(std::vector<Mat*> &inputs, std::vector<Mat> &outputs, std::vector<Mat>& internals) CV_OVERRIDE
    {
        outputs[0].setTo(1);
    }
};

class SecondCustomLayer CV_FINAL : public Layer
{
public:
    SecondCustomLayer(const LayerParams &params) : Layer(params) {}

    static Ptr<Layer> create(LayerParams& params)
    {
        return Ptr<Layer>(new SecondCustomLayer(params));
    }

    virtual void forward(InputArrayOfArrays, OutputArrayOfArrays, OutputArrayOfArrays) CV_OVERRIDE {}
    virtual void forward(std::vector<Mat*> &inputs, std::vector<Mat> &outputs, std::vector<Mat>& internals) CV_OVERRIDE
    {
        outputs[0].setTo(2);
    }
};

TEST(LayerFactory, custom_layers)
{
    LayerParams lp;
    lp.name = "name";
    lp.type = "CustomType";

    Mat inp(1, 1, CV_32FC1);
    for (int i = 0; i < 3; ++i)
    {
        if (i == 0)      { CV_DNN_REGISTER_LAYER_CLASS(CustomType, FirstCustomLayer); }
        else if (i == 1) { CV_DNN_REGISTER_LAYER_CLASS(CustomType, SecondCustomLayer); }
        else if (i == 2) { LayerFactory::unregisterLayer("CustomType"); }

        Net net;
        net.addLayerToPrev(lp.name, lp.type, lp);

        net.setInput(inp);
        net.setPreferableBackend(DNN_BACKEND_OPENCV);
        Mat output = net.forward();

        if (i == 0)      EXPECT_EQ(output.at<float>(0), 1);
        else if (i == 1) EXPECT_EQ(output.at<float>(0), 2);
        else if (i == 2) EXPECT_EQ(output.at<float>(0), 1);
    }
    LayerFactory::unregisterLayer("CustomType");
}

}} // namespace