/*
 * (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;
	XMoveResizeWindow(dpy, c->title, c->bx, 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;
	if(c->fy < bh)
		c->by = c->fy = c->ty += bh;
	c->bw = c->fw = c->tw = wa->width;
	c->fh = c->th = wa->height;
	c->bh = bh;

	diff = sw - c->fw;
	c->fx = sx + (random() % diff ? diff : 1);
	diff = sh - c->fh;
	c->fy = sy + (random() % diff ? diff : 1);

	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, 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));

	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 {
		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, 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 == BottomRight)
		*c->x = right - *c->w;
	if(sticky == BottomLeft || sticky == BottomRight)
		*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;
	e.window = c->win;
	e.x = *c->x;
	e.y = *c->y;
	e.width = *c->w;
	e.height = *c->h;
	e.border_width = c->border;
	e.above = None;
	e.override_redirect = False;
	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&e);
	XSync(dpy, False);
}

void
setgeom(Client *c)
{
	if((arrange == dotile) && !c->isfloat) {
		c->x = &c->tx;
		c->y = &c->ty;
		c->w = &c->tw;
		c->h = &c->th;
	}
	else {
		c->x = &c->fx;
		c->y = &c->fy;
		c->w = &c->fw;
		c->h = &c->fh;
	}
}

void
setsize(Client *c)
{
	XSizeHints size;
	long msize;
	if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
		size.flags = PSize;
	c->flags = size.flags;
	if(c->flags & PBaseSize) {
		c->basew = size.base_width;
		c->baseh = size.base_height;
	}
	else
		c->basew = c->baseh = 0;
	if(c->flags & PResizeInc) {
		c->incw = size.width_inc;
		c->inch = size.height_inc;
	}
	else
		c->incw = c->inch = 0;
	if(c->flags & PMaxSize) {
		c->maxw = size.max_width;
		c->maxh = size.max_height;
	}
	else
		c->maxw = c->maxh = 0;
	if(c->flags & PMinSize) {
		c->minw = size.min_width;
		c->minh = size.min_height;
	}
	else
		c->minw = c->minh = 0;
	if(c->flags & PWinGravity)
		c->grav = size.win_gravity;
	else
		c->grav = NorthWestGravity;
}

void
settitle(Client *c)
{
	XTextProperty name;
	int n;
	char **list = NULL;

	name.nitems = 0;
	c->name[0] = 0;
	XGetTextProperty(dpy, c->win, &name, netatom[NetWMName]);
	if(!name.nitems)
		XGetWMName(dpy, c->win, &name);
	if(!name.nitems)
		return;
	if(name.encoding == XA_STRING)
		strncpy(c->name, (char *)name.value, sizeof(c->name));
	else {
		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
				&& n > 0 && *list)
		{
			strncpy(c->name, *list, sizeof(c->name));
			XFreeStringList(list);
		}
	}
	XFree(name.value);
	resizetitle(c);
}

void
unmanage(Client *c)
{
	Client **l;

	XGrabServer(dpy);
	XSetErrorHandler(xerrordummy);

	XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
	XDestroyWindow(dpy, c->title);

	for(l = &clients; *l && *l != c; l = &(*l)->next);
	*l = c->next;
	for(l = &clients; *l; l = &(*l)->next)
		if((*l)->revert == c)
			(*l)->revert = NULL;
	if(sel == c)
		sel = sel->revert ? sel->revert : clients;

	free(c);

	XSync(dpy, False);
	XSetErrorHandler(xerror);
	XUngrabServer(dpy);
	arrange(NULL);
	if(sel)
		focus(sel);
}

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

	if(!sel)
		return;

	if(sel == getnext(clients, tsel) && sel->next)  {
		if((c = getnext(sel->next, tsel)))
			sel = c;
	}

	pop(sel);
	focus(sel);
}