#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>

XIMStyle ChooseBetterStyle(XIMStyle style1, XIMStyle style2)
{
    XIMStyle s,t;
    XIMStyle preedit = XIMPreeditArea | XIMPreeditCallbacks |
                       XIMPreeditPosition | XIMPreeditNothing | XIMPreeditNone;
    XIMStyle status = XIMStatusArea | XIMStatusCallbacks |
                      XIMStatusNothing | XIMStatusNone;
    if (style1 == 0) return style2;
    if (style2 == 0) return style1;
    if ((style1 & (preedit | status)) == (style2 & (preedit | status)))
        return style1;
    s = style1 & preedit;
    t = style2 & preedit;
    if (s != t) {
        if (s | t | XIMPreeditCallbacks)
            return (s == XIMPreeditCallbacks)?style1:style2;
        else if (s | t | XIMPreeditPosition)
            return (s == XIMPreeditPosition)?style1:style2;
        else if (s | t | XIMPreeditArea)
            return (s == XIMPreeditArea)?style1:style2;
        else if (s | t | XIMPreeditNothing)
            return (s == XIMPreeditNothing)?style1:style2;
    }
    else { /* if preedit flags are the same, compare status flags */
        s = style1 & status;
        t = style2 & status;
        if (s | t | XIMStatusCallbacks)
            return (s == XIMStatusCallbacks)?style1:style2;
        else if (s | t | XIMStatusArea)
            return (s == XIMStatusArea)?style1:style2;
        else if (s | t | XIMStatusNothing)
            return (s == XIMStatusNothing)?style1:style2;
    }
}

int main(int argc, char **argv)
{
    Display *dpy;
    Window root;
    XIM xim;
    XIC xic;
    unsigned long event_mask;
    XIMStyle app_supported_styles;
    XVaNestedList list;
    XIMStyle style;
    XFontSet fontset;
    XIMStyle best_style;
    XIMStyles *im_supported_styles;


    dpy = XOpenDisplay(NULL);
    root = XDefaultRootWindow(dpy);

    xim = XOpenIM(dpy, NULL, NULL, NULL);

    event_mask = FocusIn | FocusOut;
    if((dpy = XOpenDisplay(NULL)) == NULL) {
        perror(argv[0]);
        exit(1);
    }

    XGetIMValues(xim, XNQueryInputStyle, &im_supported_styles, NULL);
    app_supported_styles = XIMPreeditNone | XIMPreeditNothing | XIMPreeditArea;
    app_supported_styles |= XIMStatusNone | XIMStatusNothing | XIMStatusArea;

    for(int i=0; i < im_supported_styles->count_styles; i++) {
        style = im_supported_styles->supported_styles[i];
        if ((style & app_supported_styles) == style) /* if we can handle it */
            best_style = ChooseBetterStyle(style, best_style);
    }
    XFree(im_supported_styles);


    list = XVaCreateNestedList(0, XNFontSet, fontset, NULL);
    xic = XCreateIC(xim, XNInputStyle, best_style,
                    XNClientWindow, root,
                    XNPreeditAttributes, list,
                    XNStatusAttributes, list,
                    NULL);
    XFree(list);

    XGetICValues(xic, XNFilterEvents, &event_mask, NULL);
    XSelectInput(dpy, root, FocusChangeMask | event_mask);
    XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
    XSetICFocus(xic);
    for(;;) {
        XEvent e;
        XNextEvent(dpy, &e);
        if (XFilterEvent(&e, None)) continue;
    printf("Received");
        switch (e.type) {

        }
    }
    return 0;

}