/*
 * Copyright 2010 Johan Veenhuizen
 */

#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xproto.h>

#include "wind.h"

#define MWM_HINTS_DECORATIONS (1L << 1)

#define MWM_DECOR_TITLE (1L << 3)

typedef struct {
	CARD32 flags;
	CARD32 functions;
	CARD32 decorations;
	INT32 inputMode;
	CARD32 status;
} PropMotifWmHints;

static Atom MOTIF_WM_HINTS;

static void reloadhints(struct client *);
static PropMotifWmHints *gethints(struct client *);

void mwm_startwm(void)
{
	MOTIF_WM_HINTS = XInternAtom(dpy, "_MOTIF_WM_HINTS", False);
}

void mwm_manage(struct client *c)
{
	reloadhints(c);
}

void mwm_propertynotify(struct client *c, XPropertyEvent *e)
{
	if (e->atom == MOTIF_WM_HINTS)
		reloadhints(c);
}

/*
 * We ignore all hints except the title decor hint. If the window
 * does not want a title, we remove it's frame completely.
 */
static void reloadhints(struct client *c)
{
	Bool undecorated = False;

	PropMotifWmHints *h = gethints(c);
	if (h != NULL) {
		if (h->flags & MWM_HINTS_DECORATIONS) {
			if ((h->decorations & MWM_DECOR_TITLE) == 0)
				undecorated = True;
		}
		XFree(h);
	}

	csetundecorated(c, undecorated);
}

static PropMotifWmHints *gethints(struct client *c)
{
	unsigned long n = 0;
	PropMotifWmHints *h = getprop(cgetwin(c), MOTIF_WM_HINTS,
			MOTIF_WM_HINTS, 32, &n);
	if (h != NULL && n != 5) {
		XFree(h);
		h = NULL;
	}
	return h;
}