/**
 * simpleswitcher
 * 
 * MIT/X11 License
 * Copyright (c) 2012 Sean Pringle <sean.pringle@gmail.com>
 * Modified 2013 Qball  Cow <qball@gmpclient.org>
 * 
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 */

#define _GNU_SOURCE
#include <X11/X.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xmd.h>
#include <X11/Xutil.h>
#include <X11/Xproto.h>
#include <X11/keysym.h>
#include <X11/XKBlib.h>
#include <X11/Xft/Xft.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <ctype.h>
#include <math.h>
#include <signal.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <err.h>
#include <X11/extensions/Xinerama.h>

#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define NEAR(a,o,b) ((b) > (a)-(o) && (b) < (a)+(o))
#define OVERLAP(a,b,c,d) (((a)==(c) && (b)==(d)) || MIN((a)+(b), (c)+(d)) - MAX((a), (c)) > 0)
#define INTERSECT(x,y,w,h,x1,y1,w1,h1) (OVERLAP((x),(w),(x1),(w1)) && OVERLAP((y),(h),(y1),(h1)))

#define OPAQUE 0xffffffff
#define OPACITY    "_NET_WM_WINDOW_OPACITY"

static void* allocate(unsigned long bytes)
{
	void *ptr = malloc(bytes);
	if (!ptr)
	{
		fprintf(stderr, "malloc failed!\n");
		exit(EXIT_FAILURE);
	}
	return ptr;
}
static void* allocate_clear(unsigned long bytes)
{
	void *ptr = allocate(bytes);
	memset(ptr, 0, bytes);
	return ptr;
}
static void* reallocate(void *ptr, unsigned long bytes)
{
	ptr = realloc(ptr, bytes);
	if (!ptr)
	{
		fprintf(stderr, "realloc failed!\n");
		exit(EXIT_FAILURE);
	}
	return ptr;
}

static inline char **tokenize(const char *input)
{
    if(input == NULL) return NULL;
    char *saveptr = NULL, *token;
    char **retv  = NULL;
    // First entry is always full (modified) stringtext.
    int num_tokens = 1;

    //First entry is string that is modified.
    retv = malloc(2*sizeof(char*));
    retv[0] = strdup(input);
    retv[1] = NULL;

    // Iterate over tokens.
    for(
            token = strtok_r(retv[0], " ", &saveptr);
            token != NULL; 
            token = strtok_r(NULL, " ", &saveptr))
    {
        retv = realloc(retv, sizeof(char*)*(num_tokens+2)); 
        retv[num_tokens+1] = NULL;
        retv[num_tokens] = token;
        num_tokens++;
    }

    return retv;
}

static inline void tokenize_free(char **ip)
{
    if(ip == NULL) return;
    if(ip[0])
        free(ip[0]);
    free(ip);
}

void catch_exit(int sig)
{
	while (0 < waitpid(-1, NULL, WNOHANG));
}

int execsh(char *cmd)
{
	// use sh for args parsing
	return execlp("/bin/sh", "sh", "-c", cmd, NULL);
}

// execute sub-process
pid_t exec_cmd(char *cmd)
{
	if (!cmd || !cmd[0]) return -1;
	signal(SIGCHLD, catch_exit);
	pid_t pid = fork();
	if (!pid)
	{
		setsid();
		execsh(cmd);
		exit(EXIT_FAILURE);
	}
	return pid;
}
// cli arg handling
static int find_arg(const int argc, char * const argv[], const char * const key)
{
	int i;
    for (i = 0; i < argc && strcasecmp(argv[i], key); i++);
    return i < argc ? i: -1;
}
static char* find_arg_str(int argc, char *argv[], char *key, char* def)
{
	int i = find_arg(argc, argv, key);
	return (i > 0 && i < argc-1) ? argv[i+1]: def;
}
static int find_arg_int(int argc, char *argv[], char *key, int def)
{
	int i = find_arg(argc, argv, key);
	return (i > 0 && i < argc-1) ? strtol(argv[i+1], NULL, 10): def;
}

unsigned int NumlockMask = 0;
Display *display; Screen *screen; 
Window root;
int screen_id;

static int (*xerror)(Display *, XErrorEvent *);

#define ATOM_ENUM(x) x
#define ATOM_CHAR(x) #x

#define EWMH_ATOMS(X) \
	X(_NET_SUPPORTING_WM_CHECK),\
	X(_NET_CLIENT_LIST),\
	X(_NET_CLIENT_LIST_STACKING),\
	X(_NET_NUMBER_OF_DESKTOPS),\
	X(_NET_CURRENT_DESKTOP),\
	X(_NET_DESKTOP_GEOMETRY),\
	X(_NET_DESKTOP_VIEWPORT),\
	X(_NET_WORKAREA),\
	X(_NET_ACTIVE_WINDOW),\
	X(_NET_CLOSE_WINDOW),\
	X(_NET_MOVERESIZE_WINDOW),\
	X(_NET_WM_NAME),\
	X(_NET_WM_WINDOW_TYPE),\
	X(_NET_WM_WINDOW_TYPE_DESKTOP),\
	X(_NET_WM_WINDOW_TYPE_DOCK),\
	X(_NET_WM_WINDOW_TYPE_SPLASH),\
	X(_NET_WM_WINDOW_TYPE_UTILITY),\
	X(_NET_WM_WINDOW_TYPE_TOOLBAR),\
	X(_NET_WM_WINDOW_TYPE_MENU),\
	X(_NET_WM_WINDOW_TYPE_DIALOG),\
	X(_NET_WM_WINDOW_TYPE_NORMAL),\
	X(_NET_WM_STATE),\
	X(_NET_WM_STATE_MODAL),\
	X(_NET_WM_STATE_STICKY),\
	X(_NET_WM_STATE_MAXIMIZED_VERT),\
	X(_NET_WM_STATE_MAXIMIZED_HORZ),\
	X(_NET_WM_STATE_SHADED),\
	X(_NET_WM_STATE_SKIP_TASKBAR),\
	X(_NET_WM_STATE_SKIP_PAGER),\
	X(_NET_WM_STATE_HIDDEN),\
	X(_NET_WM_STATE_FULLSCREEN),\
	X(_NET_WM_STATE_ABOVE),\
	X(_NET_WM_STATE_BELOW),\
	X(_NET_WM_STATE_DEMANDS_ATTENTION),\
	X(_NET_WM_STATE_ADD),\
	X(_NET_WM_STATE_REMOVE),\
	X(_NET_WM_STATE_TOGGLE),\
	X(_NET_WM_STRUT),\
	X(_NET_WM_STRUT_PARTIAL),\
	X(_NET_WM_DESKTOP),\
	X(_NET_SUPPORTED)

enum { EWMH_ATOMS(ATOM_ENUM), NETATOMS };
const char *netatom_names[] = { EWMH_ATOMS(ATOM_CHAR) };
Atom netatoms[NETATOMS];

// X error handler
int oops(Display *d, XErrorEvent *ee)
{
	if (ee->error_code == BadWindow
		|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
		|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
		) return 0;
	fprintf(stderr, "error: request code=%d, error code=%d\n", ee->request_code, ee->error_code);
	return xerror(display, ee);
}

// usable space on a monitor
typedef struct {
	int x, y, w, h;
	int l, r, t, b;
} workarea;

// window lists
typedef struct {
	Window *array;
	void **data;
	int len;
} winlist;

winlist *cache_client;
winlist *cache_xattr;

#define winlist_ascend(l,i,w) for ((i) = 0; (i) < (l)->len && (((w) = (l)->array[i]) || 1); (i)++)
#define winlist_descend(l,i,w) for ((i) = (l)->len-1; (i) >= 0 && (((w) = (l)->array[i]) || 1); (i)--)

#define WINLIST 32

winlist* winlist_new()
{
	winlist *l = allocate(sizeof(winlist)); l->len = 0;
	l->array = allocate(sizeof(Window) * (WINLIST+1));
	l->data  = allocate(sizeof(void*) * (WINLIST+1));
	return l;
}
int winlist_append(winlist *l, Window w, void *d)
{
	if (l->len > 0 && !(l->len % WINLIST))
	{
		l->array = reallocate(l->array, sizeof(Window) * (l->len+WINLIST+1));
		l->data  = reallocate(l->data,  sizeof(void*)  * (l->len+WINLIST+1));
	}
	l->data[l->len] = d;
	l->array[l->len++] = w;
	return l->len-1;
}
void winlist_empty(winlist *l)
{
	while (l->len > 0) free(l->data[--(l->len)]);
}
void winlist_free(winlist *l)
{
	winlist_empty(l); free(l->array); free(l->data); free(l);
}
void winlist_empty_2d(winlist *l)
{
	while (l->len > 0) winlist_free(l->data[--(l->len)]);
}
int winlist_find(winlist *l, Window w)
{
	// iterate backwards. theory is: windows most often accessed will be
	// nearer the end. testing with kcachegrind seems to support this...
	int i; Window o; winlist_descend(l, i, o) if (w == o) return i;
	return -1;
}
int winlist_forget(winlist *l, Window w)
{
	int i, j;
	for (i = 0, j = 0; i < l->len; i++, j++)
	{
		l->array[j] = l->array[i];
		l->data[j]  = l->data[i];
		if (l->array[i] == w) { free(l->data[i]); j--; }
	}
	l->len -= (i-j);
	return j != i ?1:0;
}

#define CLIENTTITLE 100
#define CLIENTCLASS 50
#define CLIENTNAME 50
#define CLIENTSTATE 10

// a managable window
typedef struct {
	Window window, trans;
	XWindowAttributes xattr;
	char title[CLIENTTITLE], class[CLIENTCLASS], name[CLIENTNAME];
	int states;
	Atom state[CLIENTSTATE], type;
	workarea monitor;
} client;

#define MENUXFTFONT "mono-14"
#define MENUWIDTH 50
#define MENULINES 25
#define MENUFG "#222222"
#define MENUBG "#f2f1f0"
#define MENUBGALT "#e9e8e7"
#define MENUHLFG "#ffffff"
#define MENUHLBG "#005577"
#define MENURETURN 1
#define MENUMODUP 2
#define MENUBC "black"

char *config_menu_font;
char *config_menu_fg;
char *config_menu_bg;
char *config_menu_hlfg;
char *config_menu_hlbg;
char *config_menu_bgalt;
char *config_menu_bc;
unsigned int config_menu_width;
unsigned int config_menu_lines;
unsigned int config_focus_mode;
unsigned int config_raise_mode;
unsigned int config_window_placement;
unsigned int config_menu_bw;
unsigned int config_window_opacity;
unsigned int config_zeltak_mode;
unsigned int config_i3_mode;

// allocate a pixel value for an X named color
static unsigned int color_get(const char *const name)
{
	XColor color;
	Colormap map = DefaultColormap(display, screen_id);
	return XAllocNamedColor(display, map, name, &color, &color) ? color.pixel: None;
}

// find mouse pointer location
int pointer_get(Window root, int *x, int *y)
{
	*x = 0; *y = 0;
	Window rr, cr; int rxr, ryr, wxr, wyr; unsigned int mr;
	if (XQueryPointer(display, root, &rr, &cr, &rxr, &ryr, &wxr, &wyr, &mr))
	{
		*x = rxr; *y = ryr;
		return 1;
	}
	return 0;
}

int take_keyboard(Window w)
{
	int i;
	for (i = 0; i < 1000; i++)
	{
		if (XGrabKeyboard(display, w, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
			return 1;
		usleep(1000);
	}
	return 0;
}
void release_keyboard()
{
	XUngrabKeyboard(display, CurrentTime);
}

// XGetWindowAttributes with caching
XWindowAttributes* window_get_attributes(Window w)
{
	int idx = winlist_find(cache_xattr, w);
	if (idx < 0)
	{
		XWindowAttributes *cattr = allocate(sizeof(XWindowAttributes));
		if (XGetWindowAttributes(display, w, cattr))
		{
			winlist_append(cache_xattr, w, cattr);
			return cattr;
		}
		free(cattr);
		return NULL;
	}
	return cache_xattr->data[idx];
}

// retrieve a property of any type from a window
int window_get_prop(Window w, Atom prop, Atom *type, int *items, void *buffer, int bytes)
{
	Atom _type; if (!type) type = &_type;
	int _items; if (!items) items = &_items;
	int format; unsigned long nitems, nbytes; unsigned char *ret = NULL;
	memset(buffer, 0, bytes);

	if (XGetWindowProperty(display, w, prop, 0, bytes/4, False, AnyPropertyType, type,
		&format, &nitems, &nbytes, &ret) == Success && ret && *type != None && format)
	{
		if (format ==  8) memmove(buffer, ret, MIN(bytes, nitems));
		if (format == 16) memmove(buffer, ret, MIN(bytes, nitems * sizeof(short)));
		if (format == 32) memmove(buffer, ret, MIN(bytes, nitems * sizeof(long)));
		*items = (int)nitems; XFree(ret);
		return 1;
	}
	return 0;
}

// retrieve a text property from a window
// technically we could use window_get_prop(), but this is better for character set support
char* window_get_text_prop(Window w, Atom atom)
{
	XTextProperty prop; char *res = NULL;
	char **list = NULL; int count;
	if (XGetTextProperty(display, w, &prop, atom) && prop.value && prop.nitems)
	{
		if (prop.encoding == XA_STRING)
		{
			res = allocate(strlen((char*)prop.value)+1);
			strcpy(res, (char*)prop.value);
		}
		else
		if (XmbTextPropertyToTextList(display, &prop, &list, &count) >= Success && count > 0 && *list)
		{
			res = allocate(strlen(*list)+1);
			strcpy(res, *list);
			XFreeStringList(list);
		}
	}
	if (prop.value) XFree(prop.value);
	return res;
}

int window_get_atom_prop(Window w, Atom atom, Atom *list, int count)
{
	Atom type; int items;
	return window_get_prop(w, atom, &type, &items, list, count*sizeof(Atom)) && type == XA_ATOM ? items:0;
}

void window_set_atom_prop(Window w, Atom prop, Atom *atoms, int count)
{
	XChangeProperty(display, w, prop, XA_ATOM, 32, PropModeReplace, (unsigned char*)atoms, count);
}

int window_get_cardinal_prop(Window w, Atom atom, unsigned long *list, int count)
{
	Atom type; int items;
	return window_get_prop(w, atom, &type, &items, list, count*sizeof(unsigned long)) && type == XA_CARDINAL ? items:0;
}

// a ClientMessage
int window_send_message(Window target, Window subject, Atom atom, unsigned long protocol, unsigned long mask, Time time)
{
	XEvent e; memset(&e, 0, sizeof(XEvent));
	e.xclient.type = ClientMessage;
	e.xclient.message_type = atom;     e.xclient.window    = subject;
	e.xclient.data.l[0]    = protocol; e.xclient.data.l[1] = time;
	e.xclient.send_event   = True;     e.xclient.format    = 32;
	int r = XSendEvent(display, target, False, mask, &e) ?1:0;
	XFlush(display);
	return r;
}

// find the dimensions of the monitor displaying point x,y
void monitor_dimensions(Screen *screen, int x, int y, workarea *mon)
{
	memset(mon, 0, sizeof(workarea));
	mon->w = WidthOfScreen(screen);
	mon->h = HeightOfScreen(screen);

	// locate the current monitor
	if (XineramaIsActive(display))
	{
		int monitors, i;
		XineramaScreenInfo *info = XineramaQueryScreens(display, &monitors);
		if (info) for (i = 0; i < monitors; i++)
		{
			if (INTERSECT(x, y, 1, 1, info[i].x_org, info[i].y_org, info[i].width, info[i].height))
			{
				mon->x = info[i].x_org; mon->y = info[i].y_org;
				mon->w = info[i].width; mon->h = info[i].height;
				break;
			}
		}
		XFree(info);
	}
}

// determine which monitor holds the active window, or failing that the mouse pointer
void monitor_active(workarea *mon)
{
	Window root = RootWindow(display, XScreenNumberOfScreen(screen));

	unsigned long id; Atom type; int count;
	if (window_get_prop(root, netatoms[_NET_ACTIVE_WINDOW], &type, &count, &id, 1)
		&& type == XA_WINDOW && count > 0)
	{
		XWindowAttributes *attr = window_get_attributes(id);
		monitor_dimensions(screen, attr->x, attr->y, mon);
		return;
	}
	int x, y;
	if (pointer_get(root, &x, &y))
	{
		monitor_dimensions(screen, x, y, mon);
		return;
	}
	monitor_dimensions(screen, 0, 0, mon);
}

// _NET_WM_STATE_*
int client_has_state(client *c, Atom state)
{
	int i;
	for (i = 0; i < c->states; i++)
		if (c->state[i] == state) return 1;
	return 0;
}

// collect info on any window
// doesn't have to be a window we'll end up managing
client* window_client(Window win)
{
	if (win == None) return NULL;
	int idx = winlist_find(cache_client, win);
	if (idx >= 0) return cache_client->data[idx];

	// if this fails, we're up that creek
	XWindowAttributes *attr = window_get_attributes(win);
	if (!attr) return NULL;

	client *c = allocate_clear(sizeof(client));
	c->window = win;
	// copy xattr so we don't have to care when stuff is freed
	memmove(&c->xattr, attr, sizeof(XWindowAttributes));
	XGetTransientForHint(display, win, &c->trans);

	c->states = window_get_atom_prop(win, netatoms[_NET_WM_STATE], c->state, CLIENTSTATE);
	window_get_atom_prop(win, netatoms[_NET_WM_WINDOW_TYPE], &c->type, 1);

	if (c->type == None) c->type = (c->trans != None)
		// trasients default to dialog
		? netatoms[_NET_WM_WINDOW_TYPE_DIALOG]
		// non-transients default to normal
		: netatoms[_NET_WM_WINDOW_TYPE_NORMAL];

	char *name;
	if ((name = window_get_text_prop(c->window, netatoms[_NET_WM_NAME])) && name)
	{
		snprintf(c->title, CLIENTTITLE, "%s", name);
		free(name);
	}
	else
	if (XFetchName(display, c->window, &name))
	{
		snprintf(c->title, CLIENTTITLE, "%s", name);
		XFree(name);
	}
	XClassHint chint;
	if (XGetClassHint(display, c->window, &chint))
	{
		snprintf(c->class, CLIENTCLASS, "%s", chint.res_class);
		snprintf(c->name, CLIENTNAME, "%s", chint.res_name);
		XFree(chint.res_class); XFree(chint.res_name);
	}
	monitor_dimensions(c->xattr.screen, c->xattr.x, c->xattr.y, &c->monitor);
	winlist_append(cache_client, c->window, c);
	return c;
}

#define ALLWINDOWS 1
#define DESKTOPWINDOWS 2

unsigned int all_windows_modmask; KeySym all_windows_keysym;
unsigned int desktop_windows_modmask; KeySym desktop_windows_keysym;
// flags to set if we switch modes on the fly
int run_all_windows = 0, run_desktop_windows = 0, current_mode = 0;
Window main_window = None;

#include "textbox.c"

void menu_draw(textbox *text, textbox **boxes, int max_lines, int selected, char **filtered)
{
	int i;
	textbox_draw(text);
	for (i = 0; i < max_lines; i++)
	{
		textbox_font(boxes[i], config_menu_font,
			i == selected ? config_menu_hlfg: config_menu_fg,
			i == selected ? config_menu_hlbg: config_menu_bg);
		textbox_text(boxes[i], filtered[i] ? filtered[i]: "");
		textbox_draw(boxes[i]);
	}
}


/* Very bad implementation of tab completion.
 * It will complete to the common prefix
 */
static int calculate_common_prefix(char **filtered, int max_lines)
{
    int length_prefix = 0,j,found = 1;
    if(filtered[0] != NULL) {
        char *p = filtered[0];
        do{
            found = 1;
            for(j=0; j < max_lines && filtered[j] != NULL; j++) {
                if(filtered[j][length_prefix] == '\0' || filtered[j][length_prefix] != *p) {
                    if(found)
                        found=0;
                    break;
                }
            }
            if(found)
                length_prefix++;
            p++;
        }while(found );
    }
    return length_prefix;
}

int menu(char **lines, char **input, char *prompt, int selected, Time *time)
{
	int line = -1, i, j, chosen = 0, aborted = 0;
	workarea mon; monitor_active(&mon);

	int num_lines = 0; for (; lines[num_lines]; num_lines++);
	int max_lines = MIN(config_menu_lines, num_lines);
	selected = MAX(MIN(num_lines-1, selected), 0);

	int w = config_menu_width < 101 ? (mon.w/100)*config_menu_width: config_menu_width;
	int x = mon.x + (mon.w - w)/2;

	Window box;
	XWindowAttributes attr;

	// main window isn't explicitly destroyed in case we switch modes. Reusing it prevents flicker
	if (main_window != None && XGetWindowAttributes(display, main_window, &attr))
	{
		box = main_window;
	}
	else
	{
		box = XCreateSimpleWindow(display, root, x, 0, w, 300, 1, color_get(config_menu_bc), color_get(config_menu_bg));
		XSelectInput(display, box, ExposureMask);
		// make it an unmanaged window
		window_set_atom_prop(box, netatoms[_NET_WM_STATE], &netatoms[_NET_WM_STATE_ABOVE], 1);
		//window_set_atom_prop(box, netatoms[_NET_WM_WINDOW_TYPE], &netatoms[_NET_WM_WINDOW_TYPE_DOCK], 1);
		XSetWindowAttributes sattr; sattr.override_redirect = True;
		XChangeWindowAttributes(display, box, CWOverrideRedirect, &sattr);
		main_window = box;

        // Set the WM_NAME
        XStoreName(display, box, "simpleswitcher");

        // Hack to set window opacity.
        unsigned int opacity_set = (unsigned int)((config_window_opacity/100.0)* OPAQUE);
        XChangeProperty(display, box, XInternAtom(display, OPACITY, False),
                    XA_CARDINAL, 32, PropModeReplace,
                    (unsigned char *) &opacity_set, 1L);
    }

	// search text input
	textbox *text = textbox_create(box, TB_AUTOHEIGHT|TB_EDITABLE, 5, 5, w-10, 1,
		config_menu_font, config_menu_fg, config_menu_bg, "", prompt);
	textbox_show(text);

	int line_height = text->font->ascent + text->font->descent;
	line_height += line_height/10;

	// filtered list display
	textbox **boxes = allocate_clear(sizeof(textbox*) * max_lines);

	for (i = 0; i < max_lines; i++)
	{
		boxes[i] = textbox_create(box, TB_AUTOHEIGHT, 5, (i+1) * line_height + 5, w-10, 1,
			config_menu_font, config_menu_fg, config_menu_bg, lines[i], NULL);
		textbox_show(boxes[i]);
	}

	// filtered list
	char **filtered = allocate_clear(sizeof(char*) * max_lines);
	int *line_map = allocate_clear(sizeof(int) * max_lines);
	int filtered_lines = max_lines;

    int jin = 0;
	for (i = 0; i < max_lines; i++)
	{
        if(config_i3_mode && strstr(lines[i], "i3bar") != NULL) continue;
        filtered[jin] = lines[i];
		line_map[jin] = i;
        jin++;
	}

	// resize window vertically to suit
	int h = line_height * (max_lines+1) + 8;
	int y = mon.y + (mon.h - h)/2;
	XMoveResizeWindow(display, box, x, y, w, h);
	XMapRaised(display, box);

	take_keyboard(box);
	for (;;)
	{
		XEvent ev;
		XNextEvent(display, &ev);

		if (ev.type == Expose)
		{
			while (XCheckTypedEvent(display, Expose, &ev));
			menu_draw(text, boxes, max_lines, selected, filtered);
		}
		else
		if (ev.type == KeyPress)
		{
			while (XCheckTypedEvent(display, KeyPress, &ev));

			if (time)
				*time = ev.xkey.time;

			int rc = textbox_keypress(text, &ev);
			if (rc < 0)
			{
				chosen = 1;
				break;
			}
			else
			if (rc)
			{
                char **tokens = tokenize(text->text);
				// input changed
				for (i = 0, j = 0; i < num_lines && j < max_lines; i++)
                {
                    int match = 1;
                    // Do a tokenized match.
                    if(tokens) for(int j  = 1; match && tokens[j]; j++)
                    {
                        match = (strcasestr(lines[i], tokens[j]) != NULL);
                    }

                    // If each token was matched, add it to list. 
                    if(match)
                    {
                        if(config_i3_mode && strstr(lines[i], "i3bar") != NULL) continue;
                        line_map[j] = i;
                        filtered[j++] = lines[i];
                    }
                }
                // Cleanup + bookkeeping.
                filtered_lines = j;
				selected = MAX(0, MIN(selected, j-1));
				for (; j < max_lines; j++)
					filtered[j] = NULL;
                if(config_zeltak_mode && filtered_lines == 1){
                    chosen = 1;
                    break;
                }
                tokenize_free(tokens);
			}
			else
			{
				// unhandled key
				KeySym key = XkbKeycodeToKeysym(display, ev.xkey.keycode, 0, 0);

				if (key == XK_Escape
					// pressing one of the global key bindings closes the switcher. this allows fast closing of the menu if an item is not selected
					|| ((all_windows_modmask == AnyModifier || ev.xkey.state & all_windows_modmask) && key == all_windows_keysym)
					|| ((desktop_windows_modmask == AnyModifier || ev.xkey.state & desktop_windows_modmask) && key == desktop_windows_keysym))
                {
                    aborted = 1;

                    // pressing a global key binding that does not match the current mode switches modes on the fly. this allow fast flipping back and forth
                    if (
                            current_mode == DESKTOPWINDOWS && 
                            (all_windows_modmask == AnyModifier || ev.xkey.state & all_windows_modmask) &&
                            key == all_windows_keysym
                       )
                    {
                        run_all_windows = 1;
                    }
                    if (
                            current_mode == ALLWINDOWS &&
                            (desktop_windows_modmask == AnyModifier || ev.xkey.state & desktop_windows_modmask) &&
                            key == desktop_windows_keysym
                       )
                    {
                        run_desktop_windows = 1;
                    }
                    break;
                }

				else
				// Up or Shift-Tab
				if (key == XK_Up || (key == XK_Tab && ev.xkey.state & ShiftMask))
					selected = selected ? MAX(0, selected-1): MAX(0, filtered_lines-1);

				else
				// Down or Tab
                if (key == XK_Down || key == XK_Tab)
                {
                    if(filtered_lines == 1) {
                        chosen = 1;
                        break;
                    }
                    int length_prefix = calculate_common_prefix(filtered, max_lines);
                    printf("Prefix: %s:%s:%d\n", filtered[0],text->text, length_prefix);
                    if(length_prefix && strncasecmp(filtered[0], text->text, length_prefix)) {
                        // Do not want to modify original string, so make copy.
                        // not eff..
                        char * str = strndup(filtered[0], length_prefix);
                        textbox_text(text, str);
                        textbox_cursor_end(text);
                        free(str);
                    }
                    else
                        selected = selected < filtered_lines-1 ? MIN(filtered_lines-1, selected+1): 0;
                }
            }
			menu_draw(text, boxes, max_lines, selected, filtered);
		}
	}
	release_keyboard();

	if (chosen && filtered[selected])
		line = line_map[selected];

	if (line < 0 && !aborted && input)
		*input = strdup(text->text);

	textbox_free(text);
	for (i = 0; i < max_lines; i++)
		textbox_free(boxes[i]);

    free(boxes);

	free(filtered);
	free(line_map);

	return line;
}

#define FORK 1
#define NOFORK 2

void run_switcher(int mode, int fmode)
{
	// TODO: this whole function is messy. build a nicer solution

	// we fork because it's technically possible to have multiple window
	// lists up at once on a zaphod multihead X setup.
	// this also happens to isolate the Xft font stuff in a child process
	// that gets cleaned up every time. that library shows some valgrind
	// strangeness...
	if (fmode == FORK)
	{
		if (fork()) return;
		display = XOpenDisplay(0);
		XSync(display, True);
	}

	do {
		if (run_all_windows)     mode = ALLWINDOWS;
		if (run_desktop_windows) mode = DESKTOPWINDOWS;

		run_all_windows = run_desktop_windows = 0;
		current_mode = mode;

		char pattern[50], **list = NULL;
		int i, classfield = 0, plen = 0, lines = 0;
		unsigned long desktops = 0, current_desktop = 0;
		Window w; client *c;

		// windows we actually display. may be slightly different to _NET_CLIENT_LIST_STACKING
		// if we happen to have a window destroyed while we're working...
		winlist *ids = winlist_new();

		if (!window_get_cardinal_prop(root, netatoms[_NET_CURRENT_DESKTOP], &current_desktop, 1))
			current_desktop = 0;

		// find window list
		Atom type; int nwins; unsigned long *wins = allocate_clear(sizeof(unsigned long) * 100);
		if (window_get_prop(root, netatoms[_NET_CLIENT_LIST_STACKING], &type, &nwins, wins, 100 * sizeof(unsigned long))
			&& type == XA_WINDOW)
		{
			// calc widths of fields
			for (i = nwins-1; i > -1; i--)
			{
				if ((c = window_client(wins[i]))
					&& !c->xattr.override_redirect
					&& !client_has_state(c, netatoms[_NET_WM_STATE_SKIP_PAGER])
					&& !client_has_state(c, netatoms[_NET_WM_STATE_SKIP_TASKBAR]))
				{
					if (mode == DESKTOPWINDOWS)
					{
						unsigned long wmdesktop = 0;
						window_get_cardinal_prop(c->window, netatoms[_NET_WM_DESKTOP], &wmdesktop, 1);
						if (wmdesktop != current_desktop) continue;
					}
					classfield = MAX(classfield, strlen(c->class));
					winlist_append(ids, c->window, NULL);
				}
			}

			// build line sprintf pattern
			if (mode == ALLWINDOWS)
			{
				if (!window_get_cardinal_prop(root, netatoms[_NET_NUMBER_OF_DESKTOPS], &desktops, 1))
					desktops = 1;

			//	plen += sprintf(pattern+plen, "%%-%ds  ", desktops < 10 ? 1: 2);
			}

			plen += sprintf(pattern+plen, "%%-%ds   %%s", MAX(5, classfield));
			list = allocate_clear(sizeof(char*) * (ids->len+1)); lines = 0;

			// build the actual list
			winlist_ascend(ids, i, w)
			{
				if ((c = window_client(w)))
				{
					// final line format
					unsigned long wmdesktop; char desktop[5]; desktop[0] = 0;
					char *line = allocate(strlen(c->title) + strlen(c->class) + classfield + 50);
					if (mode == ALLWINDOWS)
					{
						// find client's desktop. this is zero-based, so we adjust by since most
						// normal people don't think like this :-)
						if (!window_get_cardinal_prop(c->window, netatoms[_NET_WM_DESKTOP], &wmdesktop, 1))
							wmdesktop = 0xFFFFFFFF;

						if (wmdesktop < 0xFFFFFFFF)
							sprintf(desktop, "%d", (int)wmdesktop+1);

						sprintf(line, pattern, c->class, c->title);
					}
					else
                    {
                        sprintf(line, pattern, c->class, c->title);
                    }
                    list[lines++] = line;
				}
			}
			char *input = NULL;
			Time time;
			int n = menu(list, &input, "> ", 1, &time);
			if (n >= 0 && list[n])
			{
                if(config_i3_mode)
                {
                    // Hack for i3.
                    char array[128];
                    snprintf(array,128,"i3-msg [id=\"%d\"] focus",(int)(ids->array[n]));
                    exec_cmd(array);
                }
                else
                {
                    if (mode == ALLWINDOWS && isdigit(list[n][0]))
                    {
                        // TODO: get rid of strtol
                        window_send_message(root, root, netatoms[_NET_CURRENT_DESKTOP], strtol(list[n], NULL, 10)-1,
                                SubstructureNotifyMask | SubstructureRedirectMask, time);
                        XSync(display, False);
                    }
                    window_send_message(root, ids->array[n], netatoms[_NET_ACTIVE_WINDOW], 2, // 2 = pager
                            SubstructureNotifyMask | SubstructureRedirectMask, time);
                }
			}
			else
			// act as a launcher
			if (input)
			{
				exec_cmd(input);
			}
			for (i = 0; i < lines; i++)
				free(list[i]);
			free(list);
		}
		free(wins);
		winlist_free(ids);
	}
	while (run_all_windows || run_desktop_windows);

	if (fmode == FORK)
		exit(EXIT_SUCCESS);
}

// KeyPress event
void handle_keypress(XEvent *ev)
{
	KeySym key = XkbKeycodeToKeysym(display, ev->xkey.keycode, 0, 0);

	if ((all_windows_modmask == AnyModifier || ev->xkey.state & all_windows_modmask) && key == all_windows_keysym)
		run_switcher(ALLWINDOWS, FORK);

	if ((desktop_windows_modmask == AnyModifier || ev->xkey.state & desktop_windows_modmask) && key == desktop_windows_keysym)
		run_switcher(DESKTOPWINDOWS, FORK);
}

// convert a Mod+key arg to mod mask and keysym
void parse_key(char *combo, unsigned int *mod, KeySym *key)
{
	unsigned int modmask = 0;
	if (strcasestr(combo, "shift"))   modmask |= ShiftMask;
	if (strcasestr(combo, "control")) modmask |= ControlMask;
	if (strcasestr(combo, "mod1"))    modmask |= Mod1Mask;
	if (strcasestr(combo, "mod2"))    modmask |= Mod2Mask;
	if (strcasestr(combo, "mod3"))    modmask |= Mod3Mask;
	if (strcasestr(combo, "mod4"))    modmask |= Mod4Mask;
	if (strcasestr(combo, "mod5"))    modmask |= Mod5Mask;
	*mod = modmask ? modmask: AnyModifier;

	char i = strlen(combo);
	while (i > 0 && !strchr("-+", combo[i-1])) i--;

	KeySym sym = XStringToKeysym(combo+i);
	if (sym == NoSymbol || (!modmask && (strchr(combo, '-') || strchr(combo, '+'))))
	{
		fprintf(stderr, "sorry, cannot understand key combination: %s\n", combo);
		exit(EXIT_FAILURE);
	}
	*key = sym;
}

// bind a key combination on a root window, compensating for Lock* states
void grab_key(unsigned int modmask, KeySym key)
{
	KeyCode keycode = XKeysymToKeycode(display, key);
	XUngrabKey(display, keycode, AnyModifier, root);

	if (modmask != AnyModifier)
	{
		// bind to combinations of mod and lock masks, so caps and numlock don't confuse people
		XGrabKey(display, keycode, modmask, root, True, GrabModeAsync, GrabModeAsync);
		XGrabKey(display, keycode, modmask|LockMask, root, True, GrabModeAsync, GrabModeAsync);
		if (NumlockMask)
		{
			XGrabKey(display, keycode, modmask|NumlockMask, root, True, GrabModeAsync, GrabModeAsync);
			XGrabKey(display, keycode, modmask|NumlockMask|LockMask, root, True, GrabModeAsync, GrabModeAsync);
		}
	}
	else
	{
		// nice simple single key bind
		XGrabKey(display, keycode, AnyModifier, root, True, GrabModeAsync, GrabModeAsync);
	}
}

int main(int argc, char *argv[])
{
	int i, j;

	// catch help request
	if (find_arg(argc, argv, "-help") >= 0
		|| find_arg(argc, argv, "--help") >= 0
		|| find_arg(argc, argv, "-h") >= 0)
	{
		fprintf(stderr, "See the man page or visit http://github.com/seanpringle/simpleswitcher\n");
		return EXIT_FAILURE;
	}
	if(!(display = XOpenDisplay(0)))
	{
		fprintf(stderr, "cannot open display!\n");
		return EXIT_FAILURE;
	}
	signal(SIGCHLD, catch_exit);
	screen = DefaultScreenOfDisplay(display);
	screen_id = DefaultScreen(display);
	root = DefaultRootWindow(display);
	XSync(display, False); xerror = XSetErrorHandler(oops); XSync(display, False);

	// determine numlock mask so we can bind on keys with and without it
	XModifierKeymap *modmap = XGetModifierMapping(display);
	for (i = 0; i < 8; i++)
		for (j = 0; j < (int)modmap->max_keypermod; j++)
			if (modmap->modifiermap[i*modmap->max_keypermod+j] == XKeysymToKeycode(display, XK_Num_Lock))
				NumlockMask = (1<<i);
	XFreeModifiermap(modmap);

	int ac = argc; char **av = argv;
	cache_client = winlist_new();
	cache_xattr  = winlist_new();

	// X atom values
	for (i = 0; i < NETATOMS; i++) netatoms[i] = XInternAtom(display, netatom_names[i], False);

	config_menu_width     = find_arg_int(ac, av, "-width", MENUWIDTH);
	config_menu_lines     = find_arg_int(ac, av, "-lines", MENULINES);
	config_menu_font      = find_arg_str(ac, av, "-font", MENUXFTFONT);
	config_menu_fg        = find_arg_str(ac, av, "-fg", MENUFG);
	config_menu_bg        = find_arg_str(ac, av, "-bg", MENUBG);
	config_menu_bgalt     = find_arg_str(ac, av, "-bgalt", MENUBGALT);
	config_menu_hlfg      = find_arg_str(ac, av, "-hlfg", MENUHLFG);
	config_menu_hlbg      = find_arg_str(ac, av, "-hlbg", MENUHLBG);
	config_menu_bc        = find_arg_str(ac, av, "-bc", MENUBC);
	config_menu_bw        = find_arg_int(ac, av, "-bw", 1);
	config_window_opacity = find_arg_int(ac, av, "-o", 100);
    
    config_zeltak_mode    = (find_arg(ac, av, "-zeltak") >= 0);
    config_i3_mode        = (find_arg(ac, av, "-i3") >= 0);

	// flags to run immediately and exit
	if (find_arg(ac, av, "-now") >= 0)
	{
		run_switcher(ALLWINDOWS, NOFORK);
		exit(EXIT_SUCCESS);
	}
	if (find_arg(ac, av, "-dnow") >= 0)
	{
		run_switcher(DESKTOPWINDOWS, NOFORK);
		exit(EXIT_SUCCESS);
	}
	// in background mode from here on

	// key combination to display all windows from all desktops
	parse_key(find_arg_str(ac, av, "-key", "F12"), &all_windows_modmask, &all_windows_keysym);

	// key combination to display only window on the current desktop
	parse_key(find_arg_str(ac, av, "-dkey", "F11"), &desktop_windows_modmask, &desktop_windows_keysym);

	// bind key combos
	grab_key(all_windows_modmask, all_windows_keysym);
	grab_key(desktop_windows_modmask, desktop_windows_keysym);

	XEvent ev;
	for (;;)
	{
		// caches only live for a single event
		winlist_empty(cache_xattr);
		winlist_empty(cache_client);

		// block and wait for something
		XNextEvent(display, &ev);
		if (ev.xany.window == None) continue;

		if (ev.type == KeyPress) handle_keypress(&ev);
	}
	return EXIT_SUCCESS;
}