/* See LICENSE file for copyright and license details. */

/* This is a hack I did years ago. Fork dmenu and start from there if you can.
 * ~ trinity */

#include <locale.h> /* setlocale(3), LC_CTYPE */
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* strlen(3) */
#include <sysexits.h> /* EX_USAGE */
#include <unistd.h> /* getopt(3) */
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#ifdef XINERAMA
#	include <X11/extensions/Xinerama.h>
#endif
#include <X11/Xft/Xft.h>
#include "drw.h"
#include "util.h"

#define INTERSECT(x,y,w,h,r)  (MAX(0, MIN((x)+(w),(r).x_org+(r).width)  - MAX((x),(r).x_org)) \
                             * MAX(0, MIN((y)+(h),(r).y_org+(r).height) - MAX((y),(r).y_org)))

/* chars to be allocated for the text displayed in the bar */
#define BUFSIZE 1024

enum { Scheme, SchemeLast }; /* color schemes */
/* enumerated because Suckless has SchemeNorm, SchemeSel, etc.
 * should be made into like one char *Scheme[2] */

static int bh;
static XClassHint ch = {"dmenubar", "dmenubar"};
static Display *dpy;
static Drw *drw;
static char *embed;
static int inputw = 0;
static int lrpad; /* sum of left and right padding */
static int mh;
static int mon = -1;
static int mw;
static Window parentwin;
static Window root;
static Clr *scheme[SchemeLast];
static int screen;
static Window win;

#define BREAK_ON_EOF 0

/* -f option overrides fonts[0]; default X11 font or font set */
static const char *fonts[] = {
	"monospace:size=10"
};

static const char *colors[SchemeLast][2] = {
	/* fg, bg */
	[Scheme] = { "#eeeeee", "#005577" }
};

int
main(int argc, char *argv[]){
	int c;
	unsigned int du;
	Window dw;
	Window *dws;
	int i;
	int j;
	extern char *optarg;
	XSetWindowAttributes swa;
	char text[BUFSIZE];
	int topbar; /* 0=bottom 1=top */
	Window w;
	XWindowAttributes wa;
	int x;
	int y;
#ifdef XINERAMA
	XineramaScreenInfo *info;
	Window pw;
	int a, di, n, area = 0;
#endif

	topbar = 1;
	while((c = getopt(argc, argv, ":bf:m:B:F:w:")) != -1)
		switch(c){
		case 'b':
			topbar = 0;
			break;
		case 'B': if(optarg){
			colors[Scheme][ColBg] = optarg;
			break;
		}case 'f': if(optarg){
			fonts[0] = optarg;
			break;
		}case 'F': if(optarg){
			colors[Scheme][ColFg] = optarg;
			break;
		}case 'm': if(optarg){
			mon = atoi(optarg);
			break;
		}case 'w': if(optarg){
			embed = optarg;
			break;
		}default: /* optarg==0 falls through */
			fprintf(stderr,
				"Usage: %s (-b) (-B [background color])"
				"(-f [font]) (-F foreground color)\n"
				"\t(-m [monitor]) (-w [windowid)\n",
				argv[0]);
			return EX_USAGE;
		}

	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
		fprintf(stderr, "%s: No locale support.\n", argv[0]);
	if (!(dpy = XOpenDisplay(NULL)))
		die("cannot open display");
	screen = DefaultScreen(dpy);
	root = RootWindow(dpy, screen);
	if (!embed || !(parentwin = strtol(embed, NULL, 0)))
		parentwin = root;
	if (!XGetWindowAttributes(dpy, parentwin, &wa))
		die("could not get embedding window attributes: 0x%lx",
		    parentwin);
	drw = drw_create(dpy, screen, root, wa.width, wa.height);
	if (!drw_fontset_create(drw, fonts, (sizeof fonts) / (sizeof *fonts)))
		die("no fonts could be loaded.");
	lrpad = drw->fonts->h;

	/* ??? */
#ifdef __OpenBSD__
	if (pledge("stdio rpath", NULL) == -1)
		die("pledge");
#endif

	/* init appearance */
	for (j = 0; j < SchemeLast; j++)
		scheme[j] = drw_scm_create(drw, colors[j], 2);

	/* calculate menu geometry */
	bh = drw->fonts->h + 2;
	mh = bh;
#ifdef XINERAMA
	i = 0;
	if (parentwin == root && (info = XineramaQueryScreens(dpy, &n))) {
		XGetInputFocus(dpy, &w, &di);
		if (mon >= 0 && mon < n)
			i = mon;
		else if (w != root && w != PointerRoot && w != None) {
			/* find top-level window containing current input focus */
			do {
				if (XQueryTree(dpy, (pw = w), &dw, &w, &dws, &du) && dws)
					XFree(dws);
			} while (w != root && w != pw);
			/* find xinerama screen with which the window intersects most */
			if (XGetWindowAttributes(dpy, pw, &wa))
				for (j = 0; j < n; j++)
					if ((a = INTERSECT(wa.x, wa.y, wa.width, wa.height, info[j])) > area) {
						area = a;
						i = j;
					}
		}
		/* no focused window is on screen, so use pointer location instead */
		if (mon < 0 && !area && XQueryPointer(dpy, root, &dw, &dw, &x, &y, &di, &di, &du))
			for (i = 0; i < n; i++)
				if (INTERSECT(x, y, 1, 1, info[i]))
					break;

		x = info[i].x_org;
		y = info[i].y_org + (topbar ? 0 : info[i].height - mh);
		mw = info[i].width;
		XFree(info);
	} else
#endif
	{
		if (!XGetWindowAttributes(dpy, parentwin, &wa))
			die("could not get embedding window attributes: 0x%lx",
			    parentwin);
		x = 0;
		y = topbar ? 0 : wa.height - mh;
		mw = wa.width;
	}
	inputw = MIN(inputw, mw/3);

	/* create menu window */
	swa.override_redirect = True;
	swa.background_pixel = scheme[Scheme][ColBg].pixel;
	swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
	win = XCreateWindow(dpy, parentwin, x, y, mw, mh, 0,
	                    CopyFromParent, CopyFromParent, CopyFromParent,
	                    CWOverrideRedirect | CWBackPixel | CWEventMask, &swa);
	XSetClassHint(dpy, win, &ch);


	XMapRaised(dpy, win);
	if (embed) {
		XSelectInput(dpy, parentwin, FocusChangeMask | SubstructureNotifyMask);
		if (XQueryTree(dpy, parentwin, &dw, &w, &dws, &du) && dws) {
			for (i = 0; i < du && dws[i] != win; ++i)
				XSelectInput(dpy, dws[i], FocusChangeMask);
			XFree(dws);
		}
	}
	drw_resize(drw, mw, mh);

	text[0] = '\0';
	do{
		/* trim newline */
		for(i = 0; text[i] != '\0' && text[i] != '\n';);
		if(text[i] == '\n')
			text[i] = '\0';

		drw_setscheme(drw, scheme[Scheme]);
		drw_rect(drw, 0, 0, mw, mh, 1, 1);

		if(*text != '\0')
			drw_text(drw, x, 0,
				*text != '\0'
					? (drw_fontset_getwidth(drw, text)
						+ lrpad) - lrpad / 4
					: 0,
				bh, lrpad / 2, text, 0);

		drw_map(drw, win, 0, 0, mw, mh);
	}while(
		fgets(text, (sizeof text) / (sizeof *text), stdin) != NULL
		|| !BREAK_ON_EOF
	);

	for (i = 0; i < SchemeLast; i++)
		free(scheme[i]);
	drw_free(drw);
	XSync(dpy, False);
	XCloseDisplay(dpy);

	return 0;
}