/* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details.
 */
#include "dwm.h"

unsigned int master = MASTER;
unsigned int nmaster = NMASTER;
unsigned int blw = 0;
Layout *lt = NULL;

/* static */

static unsigned int nlayouts = 0;

static void
tile(void) {
	unsigned int i, n, nx, ny, nw, nh, mw, mh, tw, th;
	Client *c;

	for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next))
		n++;
	/* window geoms */
	mh = (n > nmaster) ? wah / nmaster : wah / (n > 0 ? n : 1);
	mw = (n > nmaster) ? (waw * master) / 1000 : waw;
	th = (n > nmaster) ? wah / (n - nmaster) : 0;
	tw = waw - mw;

	for(i = 0, c = clients; c; c = c->next)
		if(isvisible(c)) {
			if(c->isbanned)
				XMoveWindow(dpy, c->win, c->x, c->y);
			c->isbanned = False;
			if(c->isversatile)
				continue;
			c->ismax = False;
			nx = wax;
			ny = way;
			if(i < nmaster) {
				ny += i * mh;
				nw = mw - 2 * BORDERPX;
				nh = mh - 2 * BORDERPX;
			}
			else {  /* tile window */
				nx += mw;
				nw = tw - 2 * BORDERPX;
				if(th > 2 * BORDERPX) {
					ny += (i - nmaster) * th;
					nh = th - 2 * BORDERPX;
				}
				else /* fallback if th <= 2 * BORDERPX */
					nh = wah - 2 * BORDERPX;
			}
			resize(c, nx, ny, nw, nh, False);
			i++;
		}
		else {
			c->isbanned = True;
			XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
		}
	if(!sel || !isvisible(sel)) {
		for(c = stack; c && !isvisible(c); c = c->snext);
		focus(c);
	}
	restack();
}

LAYOUTS

/* extern */

void
focusnext(Arg *arg) {
	Client *c;
   
	if(!sel)
		return;
	for(c = sel->next; c && !isvisible(c); c = c->next);
	if(!c)
		for(c = clients; c && !isvisible(c); c = c->next);
	if(c) {
		focus(c);
		restack();
	}
}

void
focusprev(Arg *arg) {
	Client *c;

	if(!sel)
		return;
	for(c = sel->prev; c && !isvisible(c); c = c->prev);
	if(!c) {
		for(c = clients; c && c->next; c = c->next);
		for(; c && !isvisible(c); c = c->prev);
	}
	if(c) {
		focus(c);
		restack();
	}
}

void
incnmaster(Arg *arg) {
	if((lt->arrange != tile) || (nmaster + arg->i < 1)
	|| (wah / (nmaster + arg->i) <= 2 * BORDERPX))
		return;
	nmaster += arg->i;
	if(sel)
		lt->arrange();
	else
		drawstatus();
}

void
initlayouts(void) {
	unsigned int i, w;

	lt = &layout[0];
	nlayouts = sizeof layout / sizeof layout[0];
	for(blw = i = 0; i < nlayouts; i++) {
		w = textw(layout[i].symbol);
		if(w > blw)
			blw = w;
	}
}

Client *
nexttiled(Client *c) {
	for(; c && (c->isversatile || !isvisible(c)); c = c->next);
	return c;
}

void
resizemaster(Arg *arg) {
	if(lt->arrange != tile)
		return;
	if(arg->i == 0)
		master = MASTER;
	else {
		if(waw * (master + arg->i) / 1000 >= waw - 2 * BORDERPX
		|| waw * (master + arg->i) / 1000 <= 2 * BORDERPX)
			return;
		master += arg->i;
	}
	lt->arrange();
}

void
restack(void) {
	Client *c;
	XEvent ev;

	drawstatus();
	if(!sel)
		return;
	if(sel->isversatile || lt->arrange == versatile)
		XRaiseWindow(dpy, sel->win);
	if(lt->arrange != versatile) {
		if(!sel->isversatile)
			XLowerWindow(dpy, sel->win);
		for(c = nexttiled(clients); c; c = nexttiled(c->next)) {
			if(c == sel)
				continue;
			XLowerWindow(dpy, c->win);
		}
	}
	XSync(dpy, False);
	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
}

void
setlayout(Arg *arg) {
	unsigned int i;

	if(arg->i == -1) {
		for(i = 0; i < nlayouts && lt != &layout[i]; i++);
		if(i == nlayouts - 1)
			lt = &layout[0];
		else
			lt = &layout[++i];
	}
	else {
		if(arg->i < 0 || arg->i >= nlayouts)
			return;
		lt = &layout[arg->i];
	}
	if(sel)
		lt->arrange();
	else
		drawstatus();
}

void
versatile(void) {
	Client *c;

	for(c = clients; c; c = c->next) {
		if(isvisible(c)) {
			if(c->isbanned)
				XMoveWindow(dpy, c->win, c->x, c->y);
			c->isbanned = False;
			resize(c, c->x, c->y, c->w, c->h, True);
		}
		else {
			c->isbanned = True;
			XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
		}
	}
	if(!sel || !isvisible(sel)) {
		for(c = stack; c && !isvisible(c); c = c->snext);
		focus(c);
	}
	restack();
}