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#include "opencv2/datasets/or_mnist.hpp"

#include <opencv2/core.hpp>
#include <opencv2/imgcodecs.hpp>

#include <cstdio>

#include <string>
#include <vector>

using namespace std;
using namespace cv;
using namespace cv::datasets;

int main(int argc, char *argv[])
{
    const char *keys =
            "{ help h usage ? |    | show this message }"
            "{ path p         |true| path to dataset }";
    CommandLineParser parser(argc, argv, keys);
    string path(parser.get<string>("path"));
    if (parser.has("help") || path=="true")
    {
        parser.printMessage();
        return -1;
    }

    Ptr<OR_mnist> dataset = OR_mnist::create();
    dataset->load(path);

    // ***************
    // dataset contains for each object its image and label.
    // For example, let output train & test sizes and their first elements.
    printf("train size: %u\n", (unsigned int)dataset->getTrain().size());
    printf("test size: %u\n", (unsigned int)dataset->getTest().size());

    OR_mnistObj *example = static_cast<OR_mnistObj *>(dataset->getTrain()[0].get());
    printf("first train:\nlabel: %u\n", example->label);
    printf("image was saved to train0.png\n");
    imwrite("train0.png", example->image);

    example = static_cast<OR_mnistObj *>(dataset->getTest()[0].get());
    printf("first test:\nlabel: %u\n", example->label);
    printf("image was saved to test0.png\n");
    imwrite("test0.png", example->image);

    return 0;
}