#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <libsx.h>

struct textpair {
    Widget in, out;
};

void submit_cb(Widget w, void *d);
void string_cb(Widget w, char *s, void *data);
void quit(Widget w, void *d) {exit(0);}
void pollin_cb(XtPointer client_data, int *source, XtInputId *id);

int
setup_sx(int argc, char **argv, Widget w[4]) {
    XtAppContext app;
    struct textpair tp;
    Widget w[4];

    if (OpenDisplay(argc, argv) == 0) {
        fprintf(stderr, "couldn't open display\n");
        return 1;
    }

    w[0] = MakeTextWidget("", 0, 0, 300, 200);
    w[1] = MakeStringEntry(NULL, 200, string_cb, w[0]);

    tp.in  = w[1];
    tp.out = w[0];

    w[2] = MakeButton("Submit", submit_cb, &tp);
    w[3] = MakeButton("Quit", quit, NULL);

    SetWidgetPos(w[1], PLACE_UNDER, w[0], NO_CARE, NULL);
    SetWidgetPos(w[2], PLACE_RIGHT, w[1], PLACE_UNDER, w[0]);
    SetWidgetPos(w[3], PLACE_RIGHT, w[2], PLACE_UNDER, w[0]);

    if (!w[0] || !w[1])
        return 1;

    app = XtWidgetToApplicationContext(w[0]);
    if (app == NULL)
        return 1;
    XtAppAddInput(app, /* stdin */ 0, XtInputReadMask, pollin_cb, w[0]);

    return 0;
}

int
main(int argc, char **argv) {
    if (setup_sx(argc, argv, w) != 0)
        return 1;

    ShowDisplay();
    GetStandardColors();
    MainLoop();
    return 0;
}