/*
 * (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->tw = 0;
	for(i = 0; i < TLast; i++)
		if(c->tags[i])
			c->tw += textw(c->tags[i]);
	c->tw += textw(c->name);
	if(c->tw > c->w)
		c->tw = c->w + 2;
	c->tx = c->x + c->w - c->tw + 2;
	c->ty = c->y;
	XMoveResizeWindow(dpy, c->title, c->tx, c->ty, c->tw, c->th);
}

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->tx + 2 * sw, c->ty);
}

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)
{
	Client *c;
	XSetWindowAttributes twa;
	Window trans;

	c = emallocz(sizeof(Client));
	c->win = w;
	c->tx = c->x = wa->x;
	c->ty = c->y = wa->y;
	if(c->y < bh)
		c->ty = c->y += bh;
	c->tw = c->w = wa->width;
	c->h = wa->height;
	c->th = 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->tx, c->ty, c->tw, c->th,
			0, DefaultDepth(dpy, screen), CopyFromParent,
			DefaultVisual(dpy, screen),
			CWOverrideRedirect | CWBackPixmap | CWEventMask, &twa);

	settitle(c);
	settags(c);

	c->next = clients;
	clients = c;

	XGrabButton(dpy, Button1, ControlMask, c->win, False, ButtonPressMask,
			GrabModeAsync, GrabModeSync, None, None);
	XGrabButton(dpy, Button1, Mod1Mask, c->win, False, ButtonPressMask,
			GrabModeAsync, GrabModeSync, None, None);
	XGrabButton(dpy, Button2, Mod1Mask, c->win, False, ButtonPressMask,
			GrabModeAsync, GrabModeSync, None, None);
	XGrabButton(dpy, Button3, Mod1Mask, c->win, False, ButtonPressMask,
			GrabModeAsync, GrabModeSync, None, None);

	if(!c->isfloat)
		c->isfloat = trans
			|| ((c->maxw == c->minw) && (c->maxh == c->minh));

	arrange(NULL);
	/* mapping the window now prevents flicker */
	if(c->tags[tsel]) {
		XMapRaised(dpy, c->win);
		XMapRaised(dpy, c->title);
		focus(c);
	}
	else {
		ban(c);
		XMapRaised(dpy, c->win);
		XMapRaised(dpy, c->title);
		XSync(dpy, False);
	}
}

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);
}

void
resize(Client *c, Bool inc)
{
	XConfigureEvent e;

	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;
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