/*

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

 * See LICENSE file for license details.

 */

#include "dwm.h"

#include <stdlib.h>

#include <string.h>

#include <X11/Xatom.h>

#include <X11/Xutil.h>

/* static functions */

static void

resizetitle(Client *c)

{

	int i;

	c->bw = 0;

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

		if(c->tags[i])

			c->bw += textw(c->tags[i]);

	c->bw += textw(c->name);

	if(c->bw > *c->w)

		c->bw = *c->w + 2;

	c->bx = *c->x + *c->w - c->bw + 2;

	c->by = *c->y;

	if(c->tags[tsel])

		XMoveResizeWindow(dpy, c->title, c->bx, c->by, c->bw, c->bh);

	else

		XMoveResizeWindow(dpy, c->title, c->bx + 2 * sw, c->by, c->bw, c->bh);

}

static int

xerrordummy(Display *dsply, XErrorEvent *ee)

{

	return 0;

}

/* extern functions */

void

ban(Client *c)

{

	XMoveWindow(dpy, c->win, *c->x + 2 * sw, *c->y);

	XMoveWindow(dpy, c->title, c->bx + 2 * sw, c->by);

}

void

focus(Client *c)

{

	Client *old = sel;

	XEvent ev;

	sel = c;

	if(old && old != c)

		drawtitle(old);

	drawtitle(c);

	XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);

	XSync(dpy, False);

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

}

void

focusnext(Arg *arg)

{

	Client *c;

	if(!sel)

		return;

	if(!(c = getnext(sel->next, tsel)))

		c = getnext(clients, tsel);

	if(c) {

		higher(c);

		c->revert = sel;

		focus(c);

	}

}

void

focusprev(Arg *arg)

{

	Client *c;

	if(!sel)

		return;

	if((c = sel->revert && sel->revert->tags[tsel] ? sel->revert : NULL)) {

		higher(c);

		focus(c);

	}

}

Client *

getclient(Window w)

{

	Client *c;

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

		if(c->win == w)

			return c;

	return NULL;

}

Client *

getctitle(Window w)

{

	Client *c;

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

		if(c->title == w)

			return c;

	return NULL;

}

void

gravitate(Client *c, Bool invert)

{

	int dx = 0, dy = 0;

	switch(c->grav) {

	case StaticGravity:

	case NorthWestGravity:

	case NorthGravity:

	case NorthEastGravity:

		dy = c->border;

		break;

	case EastGravity:

	case CenterGravity:

	case WestGravity:

		dy = -(*c->h / 2) + c->border;

		break;

	case SouthEastGravity:

	case SouthGravity:

	case SouthWestGravity:

		dy = -(*c->h);

		break;

	default:

		break;

	}

	switch (c->grav) {

	case StaticGravity:

	case NorthWestGravity:

	case WestGravity:

	case SouthWestGravity:

		dx = c->border;

		break;

	case NorthGravity:

	case CenterGravity:

	case SouthGravity:

		dx = -(*c->w / 2) + c->border;

		break;

	case NorthEastGravity:

	case EastGravity:

	case SouthEastGravity:

		dx = -(*c->w + c->border);

		break;

	default:

		break;

	}

	if(invert) {

		dx = -dx;

		dy = -dy;

	}

	*c->x += dx;

	*c->y += dy;

}

void

higher(Client *c)

{

	XRaiseWindow(dpy, c->win);

	XRaiseWindow(dpy, c->title);

}

void

killclient(Arg *arg)

{

	if(!sel)

		return;

	if(sel->proto & WM_PROTOCOL_DELWIN)

		sendevent(sel->win, wmatom[WMProtocols], wmatom[WMDelete]);

	else

		XKillClient(dpy, sel->win);

}

void

lower(Client *c)

{

	XLowerWindow(dpy, c->title);

	XLowerWindow(dpy, c->win);

}

void

manage(Window w, XWindowAttributes *wa)

{

	int diff;

	Client *c;

	XSetWindowAttributes twa;

	Window trans;

	c = emallocz(sizeof(Client));

	c->win = w;

	c->bx = c->fx = c->tx = wa->x;

	c->by = c->fy = c->ty = wa->y;

	c->bw = c->fw = c->tw = wa->width;

	c->fh = c->th = wa->height;

	c->bh = bh;

	diff = sw - c->fw;

	c->fx = random() % (diff ? diff : 1);

	diff = sh - c->fh - bh;

	c->fy = random() % (diff ? diff : 1);

	if(c->fy < bh)

		c->by = c->fy = c->ty = bh;

	c->border = 1;

	c->proto = getproto(c->win);

	setsize(c);

	XSelectInput(dpy, c->win,

			StructureNotifyMask | PropertyChangeMask | EnterWindowMask);

	XGetTransientForHint(dpy, c->win, &trans);

	twa.override_redirect = 1;

	twa.background_pixmap = ParentRelative;

	twa.event_mask = ExposureMask;

	c->title = XCreateWindow(dpy, root, c->bx, c->by, c->bw, c->bh,

			0, DefaultDepth(dpy, screen), CopyFromParent,

			DefaultVisual(dpy, screen),

			CWOverrideRedirect | CWBackPixmap | CWEventMask, &twa);

	settags(c);

	c->next = clients;

	clients = c;

	XGrabButton(dpy, Button1, ControlMask, c->win, False, ButtonPressMask,

			GrabModeAsync, GrabModeSync, None, None);

	XGrabButton(dpy, Button1, MODKEY, c->win, False, ButtonPressMask,

			GrabModeAsync, GrabModeSync, None, None);

	XGrabButton(dpy, Button2, MODKEY, c->win, False, ButtonPressMask,

			GrabModeAsync, GrabModeSync, None, None);

	XGrabButton(dpy, Button3, MODKEY, c->win, False, ButtonPressMask,

			GrabModeAsync, GrabModeSync, None, None);

	if(!c->isfloat)

	setgeom(c);

	settitle(c);

	arrange(NULL);

	/* mapping the window now prevents flicker */

	if(c->tags[tsel]) {

		XMapRaised(dpy, c->win);

		XMapRaised(dpy, c->title);

		focus(c);

	}

	else {

		XMapRaised(dpy, c->win);

		XMapRaised(dpy, c->title);

	}

}

void

maximize(Arg *arg)

{

	if(!sel)

		return;

	*sel->x = sx;

	*sel->y = sy + bh;

	*sel->w = sw - 2 * sel->border;

	*sel->h = sh - 2 * sel->border - bh;

	higher(sel);

	resize(sel, False, TopLeft);

}

void

pop(Client *c)

{

	Client **l;

	for(l = &clients; *l && *l != c; l = &(*l)->next);

	*l = c->next;

	c->next = clients; /* pop */

	clients = c;

	arrange(NULL);

}

void

resize(Client *c, Bool inc, Corner sticky)

{

	XConfigureEvent e;

	int right = *c->x + *c->w;

	int bottom = *c->y + *c->h;

	if(inc) {

		if(c->incw)

			*c->w -= (*c->w - c->basew) % c->incw;

		if(c->inch)

			*c->h -= (*c->h - c->baseh) % c->inch;

	}

	if(*c->x > sw) /* might happen on restart */

		*c->x = sw - *c->w;

	if(*c->y > sh)

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

	if(c->minw && *c->w < c->minw)

		*c->w = c->minw;

	if(c->minh && *c->h < c->minh)

		*c->h = c->minh;

	if(c->maxw && *c->w > c->maxw)

		*c->w = c->maxw;

	if(c->maxh && *c->h > c->maxh)

		*c->h = c->maxh;

	if(sticky == TopRight || sticky == BotRight)

		*c->x = right - *c->w;

	if(sticky == BotLeft || sticky == BotRight)

		*c->y = bottom - *c->h;

	resizetitle(c);

	XSetWindowBorderWidth(dpy, c->win, 1);

	XMoveResizeWindow(dpy, c->win, *c->x, *c->y, *c->w, *c->h);

	e.type = ConfigureNotify;

	e.event = c->win;