#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/xphoto.hpp>
#include "opencv2/xphoto/oilpainting.hpp"
#include <iostream>

using namespace cv;
using namespace std;

static void TrackSlider(int , void *);
static void addSlider(String sliderName, String windowName, int minSlider, int maxSlider, int valDefault, int *valSlider, void(*f)(int, void *), void *r);
vector<int> colorSpace = { COLOR_BGR2GRAY,COLOR_BGR2HSV,COLOR_BGR2YUV,COLOR_BGR2XYZ };

struct OilImage {
    String winName = "Oil painting";
    int size;
    int dynRatio;
    int colorSpace;
    Mat img;
};

const String keys =
"{Help h usage ? help  |     | Print this message   }"
"{v                    | 0   | video index }"
"{a                    | 700   | API index }"
"{s                    | 10   | neighbouring size }"
"{d                    | 1   | dynamic ratio }"
"{c                    | 0   | color space }"
"{@arg1                |     | file path}"
;


int main(int argc, char* argv[])
{
    CommandLineParser parser(argc, argv, keys);

    if (parser.has("help"))
    {
        parser.printMessage();
        return 0;
    }
    String filename = parser.get<String>(0);
    OilImage p;
    p.dynRatio = parser.get<int>("d");
    p.size = parser.get<int>("s");
    p.colorSpace = parser.get<int>("c");
    if (p.colorSpace < 0 || p.colorSpace >= static_cast<int>(colorSpace.size()))
    {
        std::cout << "Color space must be >= 0 and <"<< colorSpace.size()<<"\n";
        return EXIT_FAILURE;
    }
    if (!filename.empty())
    {
        p.img = imread(filename);
        if (p.img.empty())
        {
            std::cout << "Check file path!\n";
            return EXIT_FAILURE;
        }
        Mat dst;
        xphoto::oilPainting(p.img, dst, p.size, p.dynRatio, colorSpace[p.colorSpace]);
        imshow("oil painting effect", dst);
        waitKey();
        return 0;
    }
    VideoCapture v(parser.get<int>("v")+ parser.get<int>("a"));
    v>> p.img;
    p.winName="Oil Painting";
    namedWindow(p.winName);
    addSlider("DynRatio", p.winName, 1,127,p.dynRatio,&p.dynRatio, TrackSlider, &p);
    addSlider("Size", p.winName, 1, 100, p.size, &p.size, TrackSlider, &p);
    addSlider("ColorSpace", p.winName, 0, static_cast<int>(colorSpace.size()-1), p.colorSpace, &p.colorSpace, TrackSlider, &p);
    while (waitKey(20) != 27)
    {
        v>>p.img;
        imshow("Original", p.img);
        TrackSlider(0, &p);
        waitKey(10);
    }
    return 0;
}

void addSlider(String sliderName, String windowName, int minSlider, int maxSlider, int valDefault, int *valSlider, void(*f)(int, void *), void *r)
{
    createTrackbar(sliderName, windowName, valSlider, 1, f, r);
    setTrackbarMin(sliderName, windowName, minSlider);
    setTrackbarMax(sliderName, windowName, maxSlider);
    setTrackbarPos(sliderName, windowName, valDefault);
}

void TrackSlider(int , void *r)
{
    OilImage *p = (OilImage *)r;
    Mat dst;
    p->img = p->img / p->dynRatio;
    p->img = p->img*p->dynRatio;
    xphoto::oilPainting(p->img, dst, p->size, p->dynRatio,colorSpace[p->colorSpace]);
    if (!dst.empty())
    {
        imshow(p->winName, dst);
    }
}