#include <X11/Xlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xatom.h>
#include <X11/extensions/xf86vmode.h>
#include <X11/Xutil.h>
#include <X11/Xft/Xft.h>


#define PASS_LEN 20
#define FONT_SIZE 12


typedef struct { unsigned long   flags;
                 unsigned long   functions;
                 unsigned long   decorations;
                 long            inputMode;
                 unsigned long   status;
} Hints;




char *message = "Password";


void catch_fire(char *string, int error){
  fprintf(stderr, string);
  exit(error);
}


void draw_gui(Display*, Window, Visual*, Colormap, int, int, int);

  

int main(void) {
  
  Display *d = XOpenDisplay(NULL);
  
  if ( d == NULL ) 
    catch_fire("Cannot open display\n", 1);


  int s = DefaultScreen(d);


  Window w;
  XEvent e;
  Visual *visual = DefaultVisual(d, s);
  Colormap cmap = DefaultColormap(d, s);

  int depth = DefaultDepth(d, s);
  int width = DisplayWidth(d, s);
  int height = DisplayHeight(d, s);

  int mode_count;


   // VIDEO  MODES 
  XF86VidModeModeInfo **modes, *video_mode;
  XF86VidModeGetAllModeLines(d, s, &mode_count, &modes);
  video_mode = modes[0];


  // ATTRIBUTES
  XSetWindowAttributes attributes;
  attributes.override_redirect = True;
  attributes.background_pixel = BlackPixel(d, s);



  // COCKS FOR FULLSCREEN QOQS
  Hints hints;
  hints.flags = 2;
  hints.decorations = 0;

  Atom roperty = XInternAtom(d, "_MOTIF_WM_HINTS", True);
   

  w = XCreateWindow(d, XRootWindow(d, s), 0, 0, width, height, 0, depth, InputOutput, visual, CWBackPixel|CWOverrideRedirect, &attributes);


  draw_gui(d, w, visual, cmap, width, height, s);


  XSelectInput(d, w, ExposureMask | KeyPressMask);
  XMapWindow(d, w);


  // SETTING FULLSCREEN
  XF86VidModeSwitchToMode(d, s, video_mode);
  XF86VidModeSetViewPort(d, s, 0, 0);
  XMoveResizeWindow(d, w, 0, 0, width, height);
  XMapRaised(d, w);
  XGrabPointer(d, w, True, 0, GrabModeAsync, GrabModeAsync, w, 0L, CurrentTime);
  XGrabKeyboard(d, w, True, GrabModeAsync, GrabModeAsync, CurrentTime);



 
   while (1) {
      XNextEvent(d, &e);

      if (e.type == KeyPress)
         break;
   }
 
   XCloseDisplay(d);
   return 0;
}












void draw_gui(Display *d, Window w, Visual *visual, Colormap cmap, int width, int height, int s){

  // FONT
  char font_name[strlen("monospace-") +2];
  sprintf(font_name, "monospace-%d", FONT_SIZE); 
  XftFont *font = XftFontOpenName(d, s, font_name);

  // FONT COLORS
  XftColor xft_black;
  XftColorAllocName (d, visual, cmap, "black", &xft_black);
  XftColor xft_white;
  XftColorAllocName (d, visual, cmap, "white", &xft_white);



  XftDraw *xftdraw = XftDrawCreate(d, w, visual, cmap);


  // WHITE RECTANGLE
  XftDrawRect(xftdraw, &xft_white, width/2 - ((strlen(message) + PASS_LEN) / 2)*FONT_SIZE, height/2 - 2*FONT_SIZE,
                                                              (strlen(message) + PASS_LEN)*FONT_SIZE, 4*FONT_SIZE);

  // BLACK RECTANGLE
  XftDrawRect(xftdraw, &xft_black, width/2 - ((PASS_LEN - strlen(message)) / 2)*FONT_SIZE, height/2 - 2*FONT_SIZE + FONT_SIZE/2,
                                                                              (PASS_LEN * FONT_SIZE) - FONT_SIZE/2, 3*FONT_SIZE);

  // MESSAGE STRING
  XftDrawString8(xftdraw, &xft_black, font,  width/2 - ((strlen(message) + PASS_LEN) / 2)*FONT_SIZE + FONT_SIZE/2,
                                                                height/2 + FONT_SIZE/2, message, strlen(message));



}