#include <iostream>
#include <Fl/Fl.H>
#include <Fl/Fl_Box.H>
#include <Fl/Fl_Output.H>
#include <FL/Fl_Window.H>
#include <FL/fl_draw.H>


#define window_height 600
#define window_width 800

//Statusbar**************************************/

/** The class inherits a char *text from the Fl_Box. It also shows the window-resolution and the mouse-position.
 * @param text: A pointer to a char-array, that can contain a text like a status or whatever you want.
 * @parameter x: The mouse-position on the x-axis.
 * @parameter y: The mouse-position on the y-axis:
 * @parameter w: The width of a single pixel,
 * @parameter h: The height of a single pixel.
 */
class Statusbar: public Fl_Box {
    char *text;
public:
    /** The constructor of Statusbar has to get additional parameters.
      * @param x: The mouse-position on the x-axis.
      * @param y: The mouse-position on the y-axis:
      * @param w: The width of a single pixel,
      * @param h: The height of a single pixel.
      */
    Statusbar(int x, int y, int w, int h, char *text) :
            Fl_Box(x, y, w, h,text) {
        this->text = text;
    };
    void set_text(char *text) {
        this->text = text;
    }
    //An exampel to show, how the content of the text can be changed.
    void change_text(){
        if(text=="status0")
            set_text("status1");
        else
            set_text("status0");
    }
    //This function refreshes the statusbar
    void refresh_label(){
        this->label(text);
    }
};

//Image**************************************/
/** The Image-class draws the bitmap that it get from the Shared Memory.
 * @param *buf: A pointer to the bitmap, that the image-class has to draw. Three chars are needed to get the RGB-value of a pixel, so the size equals window_height * window_width * 3.
 */

class Image : public Fl_Widget {
    uchar *buf;

    //Function to draw a bitmap
    void draw() {
        fl_draw_image(buf, x(), y(), w(), h());
    }
    /** The constructor of the image class, get additional
    * @param x: The mouse-position on the x-axis.
    * @param y: The mouse-position on the y-axis:
    * @param w: The width of a single pixel,
    * @param h: The height of a single pixel.
     */

public:
    /*Constructor*/
    Image(int x, int y, int w, int h) :
            Fl_Widget(x, y, w, h, 0) {
        buf = new uchar[w * h * 3];
        /*Just an example.*/
        for (int i = 0; i < h; i++) {
            for (int j = 0; j < w; j++) {
                buf[(j + (i * w)) * 3 + 1] = 0xff;
            }
        }
    }
/*A function to change the colors of the image-class. The colors are changing in this order: green, blue, red*/
    void change_color() {
        for (int j = 1; j < w() * h() * 3; j++) {
            if (buf[j] == 0xff) {
                buf[j] = 0;
                buf[j - 1] = 0xff;
            }
        }
        if (buf[2] == 0xff)
            buf[w() * h() * 3 - 1] = 0xff;
    }
};

//My_Window*************************************/
/** The My_Windows-class generates a window, within the window it recognizes the curretn mouse-position.
 * It also recognizes if a button is pushed on the keyboard or the mouse. Furthermore the class depict the
 * content of the Image-class and provides functions to refresh it.
 * @parame x The mouse-position on the x-axis.
 * @parame y The mouse-position on the y-axis.
 * @parame button The button that was pushed last.
 */
class My_Window : public Fl_Window {
    int x, y, button;

    /*Function to handle the input*/
    int handle(int e) {
        switch (e) {
            /*Mousebutton*/
            case FL_PUSH:
                if (Fl::event_button() == FL_LEFT_MOUSE) {
                    std::cout << "Mouse:left" << std::endl;
                } else if (Fl::event_button() == FL_RIGHT_MOUSE) {
                    std::cout << "Mouse:right" << std::endl;
                } else {
                    std::cout << "Mouse:middle" << std::endl;
                }
                return 1;
                /*Mousebutton and movement*/
            case FL_DRAG:
                x = Fl::event_x();
                y = Fl::event_y();
                std::cout << "Postion X:" << x << " Postion Y:" << y << std::endl;
                if (Fl::event_button() == FL_LEFT_MOUSE) {
                    std::cout << "Mouse:left" << std::endl;
                } else if (Fl::event_button() == FL_RIGHT_MOUSE) {
                    std::cout << "Mouse:right" << std::endl;
                } else {
                    std::cout << "Mouse:middle" << std::endl;
                }
                return 1;
                /*Mousemovement*/
            case FL_MOVE:
                x = Fl::event_x();
                y = Fl::event_y();
                std::cout << "Postion X:" << x << " Postion Y:" << y << std::endl;
                return 1;
                /*keyboardbutton*/
            case FL_KEYBOARD:
                button = Fl::event_button();
                std::cout << "Keyboard:" << (unsigned short) button << std::endl;
                return 1;
        }

    }

public:
    /*Constructor*/
    My_Window(int x, int y, const char *l) : Fl_Window(x, y, l) {}
};

/*Functions to refresh the image.*/
void refresh_image(void *pointer) {
    ((Image *) pointer)->redraw();
    Fl::repeat_timeout(0.5, refresh_image, pointer);//nach 0.5 sec refresh_bild(pointer) anrufen. Here pointer ist wie ein Parameter
}

void change_color(void *pointer) {
    ((Image *) pointer)->change_color();
    Fl::repeat_timeout(1, change_color, pointer);
}

void refresh_statusbar(void *pointer) {
    ((Statusbar **) pointer)[0]->refresh_label();
    Fl::repeat_timeout(0.5, refresh_statusbar, pointer);
}

void change_status(void *pointer) {
    ((Status_Leiste **) pointer)[0]->change_text();
    Fl::repeat_timeout(1, change_status, pointer);
}

//main*************************************/
/**
 * The main function initializes all needed classes and executes the functions.
 */
int main(int argc, char **argv) {
    My_Window *window = new My_Window(window_width, window_height, "example");
    Status_Leiste *status[5];
    window->begin();
    Bild *bild = new Bild(0, 30, window_width, window_height - 30);
    status[0] = new Status_Leiste(0, 0, 60, 30, "status0");
    status[1] = new Status_Leiste(60, 0, 60, 30, "status1");
    status[2] = new Status_Leiste(120, 0, 60, 30, "status2");
    status[3] = new Status_Leiste(180, 0, 60, 30, "status3");
    status[4] = new Status_Leiste(240, 0, 60, 30, "status4");
    Fl::repeat_timeout(0.5, refresh_bild, bild);
    Fl::repeat_timeout(1, change_color, bild);
    Fl::repeat_timeout(0.5, refresh_status_leiste, status);
    Fl::repeat_timeout(1, change_status, status);
    window->end();
    window->show(argc, argv);
    return Fl::run();
}main