/* function declarations  */
static void setgaps(int oh, int ov, int ih, int iv);
static void togglegaps(const Arg *arg);
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 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 tile(Monitor *m);
static void fibonacci(Monitor *m, int s);
static void spiral(Monitor *m);
static void dwindle(Monitor *m);


static int enablegaps = 1;   /* enables gaps, used by togglegaps */

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)
{
	enablegaps = !enablegaps;
	arrange(selmon);
}

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
getgaps(Monitor *m, int *oh, int *ov, int *ih, int *iv, unsigned int *nc)
{
	unsigned int n, oe, ie;
	Client *c;

	oe = ie = enablegaps;

	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
}
void
tile(Monitor *m)
{
	unsigned int i, n;
	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;

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

void
fibonacci(Monitor *m, int s) {
	unsigned int i, n;
	int nx, ny, nw, nh;
	int oh, ov, ih, iv;
	int nv, hrest = 0, wrest = 0, r = 1;
	Client *c;

	getgaps(m, &oh, &ov, &ih, &iv, &n);
	if(n == 0)
		return;
	
	nx = m->wx + ov;
	ny = m->wy + oh;
	nw = m->ww - 2*ov;
	nh = m->wh - 2*oh;

	for (i = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next)) {
		if (r) {
			if ((i % 2 && (nh - ih) / 2 <= (bh + 2*c->bw))
			   || (!(i % 2) && (nw - iv) / 2 <= (bh + 2*c->bw))) {
				r = 0;
			}
			if (r && i < n - 1) {
				if (i % 2) {
					nv = (nh - ih) / 2;
					hrest = nh - 2*nv - ih;
					nh = nv;
				} else {
					nv = (nw - iv) / 2;
					wrest = nw - 2*nv - iv;
					nw = nv;
				}

				if ((i % 4) == 2 && !s)
					nx += nw + iv;
				else if ((i % 4) == 3 && !s)
					ny += nh + ih;
			}

			if ((i % 4) == 0) {
				if (s) {
					ny += nh + ih;
					nh += hrest;
				}
				else {
					nh -= hrest;
					ny -= nh + ih;
				}
			}
			else if ((i % 4) == 1) {
				nx += nw + iv;
				nw += wrest;
			}
			else if ((i % 4) == 2) {
				ny += nh + ih;
				nh += hrest;
				if (i < n - 1)
					nw += wrest;
			}
			else if ((i % 4) == 3) {
				if (s) {
					nx += nw + iv;
					nw -= wrest;
				} else {
					nw -= wrest;
					nx -= nw + iv;
					nh += hrest;
				}
			}
			if (i == 0)	{
				if (n != 1) {
					nw = (m->ww - iv - 2*ov) - (m->ww - iv - 2*ov) * (1 - m->mfact);
					wrest = 0;
				}
				ny = m->wy + oh;
			}
			else if (i == 1)
				nw = m->ww - nw - iv - 2*ov;
			i++;
		}

		resize(c, nx, ny, nw - (2*c->bw), nh - (2*c->bw), False);
	} 
	
	/* for(i = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next)) { */
	/* 	if((i % 2 && nh / 2 > 2 * c->bw) */
	/* 	   || (!(i % 2) && nw / 2 > 2 * c->bw)) { */
	/* 		if(i < n - 1) { */
	/* 			if(i % 2) */
	/* 				nh /= 2; */
	/* 			else */
	/* 				nw /= 2; */
	/* 			if((i % 4) == 2 && !s) */
	/* 				nx += nw; */
	/* 			else if((i % 4) == 3 && !s) */
	/* 				ny += nh; */
	/* 		} */
	/* 		if((i % 4) == 0) { */
	/* 			if(s) */
	/* 				ny += nh; */
	/* 			else */
	/* 				ny -= nh; */
	/* 		} */
	/* 		else if((i % 4) == 1) */
	/* 			nx += nw; */
	/* 		else if((i % 4) == 2) */
	/* 			ny += nh; */
	/* 		else if((i % 4) == 3) { */
	/* 			if(s) */
	/* 				nx += nw; */
	/* 			else */
	/* 				nx -= nw; */
	/* 		} */
	/* 		if(i == 0) */
	/* 		{ */
	/* 			if(n != 1) */
	/* 				nw = m->ww * m->mfact; */
	/* 			ny = m->wy; */
	/* 		} */
	/* 		else if(i == 1) */
	/* 			nw = m->ww - nw; */
	/* 		i++; */
	/* 	} */
	/* 	resize(c, nx, ny, nw - 2 * c->bw, nh - 2 * c->bw, False); */
	/* } */
}

void
dwindle(Monitor *m) {
	fibonacci(m, 1);
}

void
spiral(Monitor *m) {
	fibonacci(m, 0);
}