/* Key binding functions */
static void defaultgaps(const Arg *arg);
static void incrgaps(const Arg *arg);
static void incrigaps(const Arg *arg);
static void incrogaps(const Arg *arg);
static void incrohgaps(const Arg *arg);
static void incrovgaps(const Arg *arg);
static void incrihgaps(const Arg *arg);
static void incrivgaps(const Arg *arg);
static void togglegaps(const Arg *arg);
/* Layouts (delete the ones you do not need) */
static void bstack(Monitor *m);
static void bstackhoriz(Monitor *m);
static void centeredmaster(Monitor *m);
static void centeredfloatingmaster(Monitor *m);
static void deck(Monitor *m);
static void dwindle(Monitor *m);
static void fibonacci(Monitor *m, int s);
static void grid(Monitor *m);
static void nrowgrid(Monitor *m);
static void spiral(Monitor *m);
static void tile(Monitor *m);
/* Internals */
static void getgaps(Monitor *m, int *oh, int *ov, int *ih, int *iv, unsigned int *nc);
static void getfacts(Monitor *m, int msize, int ssize, float *mf, float *sf, int *mr, int *sr);
static void setgaps(int oh, int ov, int ih, int iv);

/* Settings */
#if !PERTAG_PATCH
static int enablegaps = 1;
#endif // PERTAG_PATCH

void
setgaps(int oh, int ov, int ih, int iv)
{
	if (oh < 0) oh = 0;
	if (ov < 0) ov = 0;
	if (ih < 0) ih = 0;
	if (iv < 0) iv = 0;

	selmon->gappoh = oh;
	selmon->gappov = ov;
	selmon->gappih = ih;
	selmon->gappiv = iv;
	arrange(selmon);
}

void
togglegaps(const Arg *arg)
{
	#if PERTAG_PATCH
	selmon->pertag->enablegaps[selmon->pertag->curtag] = !selmon->pertag->enablegaps[selmon->pertag->curtag];
	#else
	enablegaps = !enablegaps;
	#endif // PERTAG_PATCH
	arrange(NULL);
}

void
defaultgaps(const Arg *arg)
{
	setgaps(gappoh, gappov, gappih, gappiv);
}

void
incrgaps(const Arg *arg)
{
	setgaps(
		selmon->gappoh + arg->i,
		selmon->gappov + arg->i,
		selmon->gappih + arg->i,
		selmon->gappiv + arg->i
	);
}

void
incrigaps(const Arg *arg)
{
	setgaps(
		selmon->gappoh,
		selmon->gappov,
		selmon->gappih + arg->i,
		selmon->gappiv + arg->i
	);
}

void
incrogaps(const Arg *arg)
{
	setgaps(
		selmon->gappoh + arg->i,
		selmon->gappov + arg->i,
		selmon->gappih,
		selmon->gappiv
	);
}

void
incrohgaps(const Arg *arg)
{
	setgaps(
		selmon->gappoh + arg->i,
		selmon->gappov,
		selmon->gappih,
		selmon->gappiv
	);
}

void
incrovgaps(const Arg *arg)
{
	setgaps(
		selmon->gappoh,
		selmon->gappov + arg->i,
		selmon->gappih,
		selmon->gappiv
	);
}

void
incrihgaps(const Arg *arg)
{
	setgaps(
		selmon->gappoh,
		selmon->gappov,
		selmon->gappih + arg->i,
		selmon->gappiv
	);
}

void
incrivgaps(const Arg *arg)
{
	setgaps(
		selmon->gappoh,
		selmon->gappov,
		selmon->gappih,
		selmon->gappiv + arg->i
	);
}

void
getgaps(Monitor *m, int *oh, int *ov, int *ih, int *iv, unsigned int *nc)
{
	unsigned int n, oe, ie;
	#if PERTAG_PATCH
	oe = ie = selmon->pertag->enablegaps[selmon->pertag->curtag];
	#else
	oe = ie = enablegaps;
	#endif // PERTAG_PATCH
	Client *c;

	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
	if (smartgaps && n == 1) {
		oe = 0; // outer gaps disabled when only one client
	}

	*oh = m->gappoh*oe; // outer horizontal gap
	*ov = m->gappov*oe; // outer vertical gap
	*ih = m->gappih*ie; // inner horizontal gap
	*iv = m->gappiv*ie; // inner vertical gap
	*nc = n;            // number of clients
}

void
getfacts(Monitor *m, int msize, int ssize, float *mf, float *sf, int *mr, int *sr)
{
	unsigned int n;
	float mfacts, sfacts;
	int mtotal = 0, stotal = 0;
	Client *c;

	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
	mfacts = MIN(n, m->nmaster);
	sfacts = n - m->nmaster;

	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++)
		if (n < m->nmaster)
			mtotal += msize / mfacts;
		else
			stotal += ssize / sfacts;

	*mf = mfacts; // total factor of master area
	*sf = sfacts; // total factor of stack area
	*mr = msize - mtotal; // the remainder (rest) of pixels after an even master split
	*sr = ssize - stotal; // the remainder (rest) of pixels after an even stack split
}

/***
 * Layouts
 */

/*
 * Deck layout + gaps
 * https://dwm.suckless.org/patches/deck/
 */
void
deck(Monitor *m)
{
	unsigned int i, n, bw;
	int oh, ov, ih, iv;
	int mx = 0, my = 0, mh = 0, mw = 0;
	int sx = 0, sy = 0, sh = 0, sw = 0;
	float mfacts, sfacts;
	int mrest, srest;
	Client *c;

	getgaps(m, &oh, &ov, &ih, &iv, &n);
	if (n == 0)
		return;

    if (n == 1)
        bw = 0;
    else 
        bw = borderpx;

	sx = mx = m->wx + ov;
	sy = my = m->wy + oh;
	sh = mh = m->wh - 2*oh - ih * (MIN(n, m->nmaster) - 1);
	sw = mw = m->ww - 2*ov;

	if (m->nmaster && n > m->nmaster) {
		sw = (mw - iv) * (1 - m->mfact);
		mw = mw - iv - sw;
		sx = mx + mw + iv;
		sh = m->wh - 2*oh;
	}

	getfacts(m, mh, sh, &mfacts, &sfacts, &mrest, &srest);

	if (n - m->nmaster > 0) /* override layout symbol */
		snprintf(m->ltsymbol, sizeof m->ltsymbol, "D %d", n - m->nmaster);

	for (i = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
		if (i < m->nmaster) {
			resize(c, mx, my, mw - (2*bw), (mh / mfacts) + (i < mrest ? 1 : 0) - (2*bw), bw, 0);
			my += HEIGHT(c) + ih;
		} else {
			resize(c, sx, sy, sw - (2*bw), sh - (2*bw), bw, 0);
		}
}

/*
 * Default tile layout + gaps
 */
static void
tile(Monitor *m)
{
	unsigned int i, n, bw;
	int oh, ov, ih, iv;
	int mx = 0, my = 0, mh = 0, mw = 0;
	int sx = 0, sy = 0, sh = 0, sw = 0;
	float mfacts, sfacts;
	int mrest, srest;
	Client *c;

	getgaps(m, &oh, &ov, &ih, &iv, &n);
	if (n == 0)
		return;

    if (n == 1)
        bw = 0;
    else 
        bw = borderpx;

	sx = mx = m->wx + ov;
	sy = my = m->wy + oh;
	mh = m->wh - 2*oh - ih * (MIN(n, m->nmaster) - 1);
	sh = m->wh - 2*oh - ih * (n - m->nmaster - 1);
	sw = mw = m->ww - 2*ov;

	if (m->nmaster && n > m->nmaster) {
		sw = (mw - iv) * (1 - m->mfact);
		mw = mw - iv - sw;
		sx = mx + mw + iv;
	}

	getfacts(m, mh, sh, &mfacts, &sfacts, &mrest, &srest);

	for (i = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
		if (i < m->nmaster) {
			resize(c, mx, my, mw - (2*bw), (mh / mfacts) + (i < mrest ? 1 : 0) - (2*bw), bw, 0);
			my += HEIGHT(c) + ih;
		} else {
			resize(c, sx, sy, sw - (2*bw), (sh / sfacts) + ((i - m->nmaster) < srest ? 1 : 0) - (2*bw), bw, 0);
			sy += HEIGHT(c) + ih;
		}
}