/*

 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>

 * See LICENSE file for license details.

 */

#include "dwm.h"

#include <regex.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include <X11/Xutil.h>

typedef struct {

	const char *clpattern;

	const char *tpattern;

	Bool isfloat;

} Rule;

typedef struct {

	regex_t *clregex;

	regex_t *tregex;

} RReg;

/* static */

TAGS

RULES

static RReg *rreg = NULL;

static unsigned int len = 0;

void (*arrange)(Arg *) = DEFMODE;

/* extern */

void

appendtag(Arg *arg)

{

	if(!sel)

		return;

	sel->tags[arg->i] = True;

	arrange(NULL);

}

void

dofloat(Arg *arg)

{

	Client *c;

	for(c = clients; c; c = c->next) {

		c->ismax = False;

		if(isvisible(c)) {

			resize(c, True, TopLeft);

		}

		else

			ban(c);

	}

	if((sel = getnext(clients))) {

		focus(sel);

		restack();

	}

	else

		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);

}

void

dotile(Arg *arg)

{

	int h, i, n, w;

	Client *c;

	w = sw - mw;

	for(n = 0, c = clients; c; c = c->next)

		if(isvisible(c) && !c->isfloat)

			n++;

	if(n > 1)

		h = (sh - bh) / (n - 1);

	else

		h = sh - bh;

	for(i = 0, c = clients; c; c = c->next) {

		c->ismax = False;

		if(isvisible(c)) {

			if(c->isfloat) {

				resize(c, True, TopLeft);

				continue;

			}

			if(n == 1) {

				c->x = sx;

				c->y = sy + bh;

				c->w = sw - 2;

				c->h = sh - 2 - bh;

			}

			else if(i == 0) {

				c->x = sx;

				c->y = sy + bh;

				c->w = mw - 2;

				c->h = sh - 2 - bh;

			}

			else if(h > bh) {

				c->x = sx + mw;

				c->y = sy + (i - 1) * h + bh;

				c->w = w - 2;

				if(i + 1 == n)

					c->h = sh - c->y - 2;

				else

					c->h = h - 2;

			}

			else { /* fallback if h < bh */

				c->x = sx + mw;

				c->y = sy + bh;

				c->w = w - 2;

				c->h = sh - 2 - bh;

			}

			resize(c, False, TopLeft);

			i++;

		}

		else

			ban(c);

	}

	if((sel = getnext(clients)))

		focus(sel);

	else

		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);

	restack();

}

Client *

getnext(Client *c)

{

	for(; c && !isvisible(c); c = c->next);

	return c;

}

Client *

getprev(Client *c)

{

	for(; c && !isvisible(c); c = c->prev);

	return c;

}

void

initrregs()

{

	unsigned int i;

	regex_t *reg;

	if(rreg)

		return;

	len = sizeof(rule) / sizeof(rule[0]);

	rreg = emallocz(len * sizeof(RReg));

	for(i = 0; i < len; i++) {

		if(rule[i].clpattern) {

			reg = emallocz(sizeof(regex_t));

			if(regcomp(reg, rule[i].clpattern, 0))

				free(reg);

			else

				rreg[i].clregex = reg;

		}

		if(rule[i].tpattern) {

			reg = emallocz(sizeof(regex_t));

			if(regcomp(reg, rule[i].tpattern, 0))

				free(reg);

			else

				rreg[i].tregex = reg;

		}

	}

}

Bool

isvisible(Client *c)

{

	unsigned int i;

	for(i = 0; i < ntags; i++)

		if(c->tags[i] && seltag[i])

			return True;

	return False;

}

void

replacetag(Arg *arg)

{

	int i;

	if(!sel)

		return;

	for(i = 0; i < ntags; i++)

		sel->tags[i] = False;

	appendtag(arg);

}

void

restack()

{

	static unsigned int nwins = 0;

	static Window *wins = NULL;

	unsigned int f, fi, m, mi, n;

	Client *c;

	XEvent ev;

	for(f = 0, m = 0, c = clients; c; c = c->next)

		if(isvisible(c)) {

			if(c->isfloat || arrange == dofloat)

				f++;

			else

				m++;

		}

	if(nwins < n) {

		nwins = n;

		wins = erealloc(wins, nwins * sizeof(Window));

	}

	fi = 0;

	mi = 2 * f;

	if(sel->isfloat || arrange == dofloat) {

		wins[fi++] = sel->title;

		wins[fi++] = sel->win;

	}

	else {

		wins[mi++] = sel->title;

		wins[mi++] = sel->win;

	}

	for(c = clients; c; c = c->next)

		if(isvisible(c) && c != sel) {

			if(c->isfloat || arrange == dofloat) {

				wins[fi++] = c->title;

				wins[fi++] = c->win;

			}

			else {

				wins[mi++] = c->title;

				wins[mi++] = c->win;

			}

		}

	XRestackWindows(dpy, wins, n);

	drawall();

	XSync(dpy, False);

	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));

}

void

settags(Client *c)

{

	char classinst[256];

	unsigned int i, j;

	regmatch_t tmp;

	Bool matched = False;

	XClassHint ch;

	if(XGetClassHint(dpy, c->win, &ch)) {

		snprintf(classinst, sizeof(classinst), "%s:%s",

				ch.res_class ? ch.res_class : "",

				ch.res_name ? ch.res_name : "");

		for(i = 0; !matched && i < len; i++)

			if(rreg[i].clregex && !regexec(rreg[i].clregex, classinst, 1, &tmp, 0)) {

				c->isfloat = rule[i].isfloat;

				for(j = 0; rreg[i].tregex && j < ntags; j++) {

					if(!regexec(rreg[i].tregex, tags[j], 1, &tmp, 0)) {

						matched = True;

						c->tags[j] = True;

					}

				}

			}

		if(ch.res_class)

			XFree(ch.res_class);

		if(ch.res_name)

			XFree(ch.res_name);

	}

	if(!matched)

		for(i = 0; i < ntags; i++)

			c->tags[i] = seltag[i];

}

void

togglemode(Arg *arg)

{

	arrange = arrange == dofloat ? dotile : dofloat;

	arrange(NULL);

}

void

view(Arg *arg)

{

	unsigned int i;

	for(i = 0; i < ntags; i++)

		seltag[i] = False;

	seltag[arg->i] = True;

	arrange(NULL);

}

void

toggleview(Arg *arg)

{

	unsigned int i;

	seltag[arg->i] = !seltag[arg->i];

	for(i = 0; !seltag[i] && i < ntags; i++);

	if(i == ntags)

		seltag[arg->i] = True; /* cannot toggle last view */

	arrange(NULL);

}