#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/photo/photo.hpp"

#include <iostream>

using namespace cv;
using namespace std;

static void help()
{
    cout << "\nCool inpainging demo. Inpainting repairs damage to images by floodfilling the damage \n"
            << "with surrounding image areas.\n"
            "Using OpenCV version %s\n" << CV_VERSION << "\n"
    "Usage:\n"
        "./inpaint [image_name -- Default ../data/fruits.jpg]\n" << endl;

    cout << "Hot keys: \n"
        "\tESC - quit the program\n"
        "\tr - restore the original image\n"
        "\ti or SPACE - run inpainting algorithm\n"
        "\t\t(before running it, paint something on the image)\n" << endl;
}

Mat img, inpaintMask;
Point prevPt(-1,-1);

static void onMouse( int event, int x, int y, int flags, void* )
{
    if( event == EVENT_LBUTTONUP || !(flags & EVENT_FLAG_LBUTTON) )
        prevPt = Point(-1,-1);
    else if( event == EVENT_LBUTTONDOWN )
        prevPt = Point(x,y);
    else if( event == EVENT_MOUSEMOVE && (flags & EVENT_FLAG_LBUTTON) )
    {
        Point pt(x,y);
        if( prevPt.x < 0 )
            prevPt = pt;
        line( inpaintMask, prevPt, pt, Scalar::all(255), 5, 8, 0 );
        line( img, prevPt, pt, Scalar::all(255), 5, 8, 0 );
        prevPt = pt;
        imshow("image", img);
    }
}


int main( int argc, char** argv )
{
    char* filename = argc >= 2 ? argv[1] : (char*)"../data/fruits.jpg";
    Mat img0 = imread(filename, -1);
    if(img0.empty())
    {
        cout << "Couldn't open the image " << filename << ". Usage: inpaint <image_name>\n" << endl;
        return 0;
    }

    help();

    namedWindow( "image", 1 );

    img = img0.clone();
    inpaintMask = Mat::zeros(img.size(), CV_8U);

    imshow("image", img);
    setMouseCallback( "image", onMouse, 0 );

    for(;;)
    {
        char c = (char)waitKey();

        if( c == 27 )
            break;

        if( c == 'r' )
        {
            inpaintMask = Scalar::all(0);
            img0.copyTo(img);
            imshow("image", img);
        }

        if( c == 'i' || c == ' ' )
        {
            Mat inpainted;
            inpaint(img, inpaintMask, inpainted, 3, INPAINT_TELEA);
            imshow("inpainted image", inpainted);
        }
    }

    return 0;
}