#ifndef OPENPOSE_GUI_FRAMES_DISPLAY_HPP
#define OPENPOSE_GUI_FRAMES_DISPLAY_HPP

#include <openpose/core/common.hpp>
#include <openpose/gui/enumClasses.hpp>

namespace op
{
    /**
     *  The FrameDisplayer class is the one presenting visually the processed frame to the user.
     */
    class OP_API FrameDisplayer
    {
    public:
        /**
         * Constructor of the FrameDisplayer class.
         * @param windowedName const std::string value with the opencv resulting display name. Showed at the top-left
         * part of the window.
         * @param initialWindowedSize const Point<int> with the initial window output resolution (width and height).
         * @param fullScreen bool from which the FrameDisplayer::FullScreenMode property mFullScreenMode will be set,
         * i.e., specifying the type of initial display (it can be changed later).
         */
        FrameDisplayer(const std::string& windowedName = OPEN_POSE_NAME_AND_VERSION,
                       const Point<int>& initialWindowedSize = Point<int>{}, const bool fullScreen = false);

        virtual ~FrameDisplayer();

        // Due to OpenCV visualization issues (all visualization functions must be in the same thread)
        void initializationOnThread();

        /**
         * This function set the new FrameDisplayer::FullScreenMode (e.g., full screen).
         * @param fullScreenMode New FrameDisplayer::FullScreenMode state.
         */
        void setFullScreenMode(const FullScreenMode fullScreenMode);

        /**
         * This function switch between full screen and windowed modes (e.g., when double-click on video players or
         * Ctrt+Enter are presed).
         */
        void switchFullScreenMode();

        /**
         * This function displays an image on the display.
         * @param frame Mat image to display.
         * @param waitKeyValue int value that specifies the argument parameter for cv::waitKey (see OpenCV
         * documentation for more information). Special cases: select -1
         * not to use cv::waitKey or 0 for cv::waitKey(0). OpenCV doc:
         * http://docs.opencv.org/2.4/modules/highgui/doc/user_interface.html?highlight=waitkey
         */
        void displayFrame(const Matrix& frame, const int waitKeyValue = -1);

        /**
         * Analogous to the previous displayFrame, but first it horizontally concatenates all the frames
         */
        void displayFrame(const std::vector<Matrix>& frames, const int waitKeyValue = -1);

    private:
        const std::string mWindowName;
        Point<int> mWindowedSize;
        FullScreenMode mFullScreenMode;
    };
}

#endif // OPENPOSE_GUI_FRAMES_DISPLAY_HPP