/* (C)opyright MMIV-MMVI Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details.
 */
#include "wmii.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xatom.h>

static char *Ebadcmd = "bad command",
	    *Ebadvalue = "bad value";

#define CLIENT_MASK		(StructureNotifyMask | PropertyChangeMask | EnterWindowMask)
#define ButtonMask		(ButtonPressMask | ButtonReleaseMask)

Client *
sel_client() {
	return screen->sel && screen->sel->sel->sel ? screen->sel->sel->sel->client : nil;
}

Client *
client_of_win(Window w) {
	Client *c;
	for(c=client; c && c->win != w; c=c->next);
	return c;
}

Frame *
frame_of_win(Window w) {
	Client *c;
	for(c=client; c && c->framewin != w; c=c->next);
	return c ? c->frame : nil;
}

static void
update_client_name(Client *c) {
	XTextProperty name;
	XClassHint ch;
	int n;
	char **list = nil;

	name.nitems = 0;
	c->name[0] = 0;
	XGetTextProperty(blz.dpy, c->win, &name, net_atom[NetWMName]);
	if(!name.nitems)
		XGetWMName(blz.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(blz.dpy, &name, &list, &n) >= Success
				&& n > 0 && *list)
		{
			strncpy(c->name, *list, sizeof(c->name));
			XFreeStringList(list);
		}
	}
	XFree(name.value);
	if(XGetClassHint(blz.dpy, c->win, &ch)) {
		snprintf(c->props, sizeof(c->props), "%s:%s:%s",
				ch.res_class ? ch.res_class : "",
				ch.res_name ? ch.res_name : "",
				c->name);
		if(ch.res_class)
			XFree(ch.res_class);
		if(ch.res_name)
			XFree(ch.res_name);
	}
}

Client *
create_client(Window w, XWindowAttributes *wa) {
	Client **t, *c = (Client *) ixp_emallocz(sizeof(Client));
	XSetWindowAttributes fwa;
	long msize;

	c->win = w;
	c->rect.x = wa->x;
	c->rect.y = wa->y;
	c->border = wa->border_width;
	c->rect.width = wa->width;
	c->rect.height = wa->height;
	XSetWindowBorderWidth(blz.dpy, c->win, 0);
	c->proto = win_proto(c->win);
	XGetTransientForHint(blz.dpy, c->win, &c->trans);
	if(!XGetWMNormalHints(blz.dpy, c->win, &c->size, &msize) || !c->size.flags)
		c->size.flags = PSize;
	if(c->size.flags & PMinSize && c->size.flags & PMaxSize
		&& c->size.min_width == c->size.max_width
		&& c->size.min_height == c->size.max_height)
			c->fixedsize = True;
	else
		c->fixedsize = False;
	XAddToSaveSet(blz.dpy, c->win);
	update_client_name(c);
	fwa.override_redirect = 1;
	fwa.background_pixmap = ParentRelative;
	fwa.event_mask =
		SubstructureRedirectMask | SubstructureNotifyMask | ExposureMask
		| ButtonPressMask | PointerMotionMask | ButtonReleaseMask | KeyPressMask;
	c->framewin = XCreateWindow(blz.dpy, blz.root, c->rect.x, c->rect.y,
			c->rect.width + 2 * def.border,
			c->rect.height + def.border + labelh(&def.font), 0,
			DefaultDepth(blz.dpy, blz.screen), CopyFromParent,
			DefaultVisual(blz.dpy, blz.screen),
			CWOverrideRedirect | CWBackPixmap | CWEventMask, &fwa);
	XGrabButton(blz.dpy, AnyButton, AnyModifier, c->framewin, False, ButtonMask,
			GrabModeSync, GrabModeSync, None, None);
	c->gc = XCreateGC(blz.dpy, c->framewin, 0, 0);
	XSync(blz.dpy, False);
	for(t=&client; *t; t=&(*t)->next);
	c->next = *t; /* *t == nil */
	*t = c;
	write_event("CreateClient 0x%x\n", c->win);
	return c;
}

void
set_client_state(Client * c, int state)
{
	long data[] = { state, None };
	XChangeProperty(blz.dpy, c->win, wm_atom[WMState], wm_atom[WMState], 32,
			PropModeReplace, (unsigned char *) data, 2);
}

void
focus_client(Client *c, Bool restack) {
	Client *old_in_area;
	Client *old;
	Frame *f;
	View *v;
	unsigned int a_i;
	Area *a, *old_a;

	if(!sel_screen)
		return;
	f = c->sel;
	v = f->view;
	old = sel_client();
	old_in_area = sel_client_of_area(f->area);
	old_a = v->sel;

	if(old_a->floating != f->area->floating)
		v->revert = old_a;
	v->sel = f->area;
	f->area->sel = f;
	c->floating = f->area->floating;
	if(restack)
		restack_view(v);
	if(!c->floating && f->area->mode == Colstack)
		arrange_column(f->area, False);
	XSetInputFocus(blz.dpy, c->win, RevertToPointerRoot, CurrentTime);
	if(old && old != old_in_area && old != c) {
		update_frame_widget_colors(old->sel);
		draw_frame(old->sel);
	}
	if(old_in_area && old_in_area != c) {
		update_frame_widget_colors(old_in_area->sel);
		draw_frame(old_in_area->sel);
	}
	update_frame_widget_colors(c->sel);
	draw_frame(c->sel);
	XSync(blz.dpy, False);
	if(old_a != v->sel) {
		for(a = v->area, a_i = 0; a; a = a->next, a_i++)
			if(a == v->sel) break;
		if(a_i)
			write_event("ColumnFocus %d\n", a_i);
		else
			write_event("FocusFloating\n");
	}
	if(c != old)
		write_event("ClientFocus 0x%x\n", c->win);
}

void
map_client(Client *c) {
	XSelectInput(blz.dpy, c->win, CLIENT_MASK & ~StructureNotifyMask);
	XMapWindow(blz.dpy, c->win);
	XSelectInput(blz.dpy, c->win, CLIENT_MASK);
	set_client_state(c, NormalState);
}

void
unmap_client(Client *c) {
	XSelectInput(blz.dpy, c->win, CLIENT_MASK & ~StructureNotifyMask);
	XUnmapWindow(blz.dpy, c->win);
	XSelectInput(blz.dpy, c->win, CLIENT_MASK);
	set_client_state(c, WithdrawnState);
}

void
reparent_client(Client *c, Window w, int x, int y) {
	XSelectInput(blz.dpy, c->win, CLIENT_MASK & ~StructureNotifyMask);
	XReparentWindow(blz.dpy, c->win, w, x, y);
	XSelectInput(blz.dpy, c->win, CLIENT_MASK);
}

void
configure_client(Client *c) {
	XConfigureEvent e;
	Frame *f = c->sel;

	e.type = ConfigureNotify;
	e.event = c->win;
	e.window = c->win;
	e.x = c->rect.x;
	e.y = c->rect.y;
	if(f) {
		e.x += f->rect.x;
		e.y += f->rect.y;
	}
	e.width = c->rect.width;
	e.height = c->rect.height;
	e.border_width = c->border;
	e.above = None;
	e.override_redirect = False;
	XSendEvent(blz.dpy, c->win, False,
			StructureNotifyMask, (XEvent *) & e);
	XSync(blz.dpy, False);
}

static void
send_client_message(Window w, Atom a, long value) {
	XEvent e;

	e.type = ClientMessage;
	e.xclient.window = w;
	e.xclient.message_type = a;
	e.xclient.format = 32;
	e.xclient.data.l[0] = value;
	e.xclient.data.l[1] = CurrentTime;
	XSendEvent(blz.dpy, w, False, NoEventMask, &e);
	XSync(blz.dpy, False);
}

void
kill_client(Client * c) {
	if(c->proto & WM_PROTOCOL_DELWIN)
		send_client_message(c->win, wm_atom[WMProtocols], wm_atom[WMDelete]);
	else
		XKillClient(blz.dpy, c->win);
}

void
prop_client(Client *c, XPropertyEvent *e) {
	XWMHints *wmh;
	long msize;

	if(e->atom == wm_atom[WMProtocols]) {
		c->proto = win_proto(c->win);
		return;
	}
	switch (e->atom) {
	case XA_WM_TRANSIENT_FOR:
		XGetTransientForHint(blz.dpy, c->win, &c->trans);
		break;
	case XA_WM_NORMAL_HINTS:
		if(!XGetWMNormalHints(blz.dpy, c->win, &c->size, &msize) || !c->size.flags) {
			c->size.flags = PSize;
		}
		if(c->size.flags & PMinSize && c->size.flags & PMaxSize
			&& c->size.min_width == c->size.max_width
			&& c->size.min_height == c->size.max_height)
				c->fixedsize = True;
		else
			c->fixedsize = False;
		break;
	case XA_WM_HINTS:
		wmh = XGetWMHints(blz.dpy, c->win);
		if(wmh->flags&XUrgencyHint && !client->urgent) {
			write_event("Urgent 0x%x\n", client->win);;
			client->urgent = True;
		}
		else if(!(wmh->flags&XUrgencyHint) && client->urgent) {
			write_event("NotUrgent 0x%x\n", client->win);;
			client->urgent = False;
		}
		break;
	}
	if(e->atom == XA_WM_NAME || e->atom == net_atom[NetWMName]) {
		update_client_name(c);
		if(c->frame)
			draw_frame(c->sel);
	}
}

void
gravitate_client(Client *c, Bool invert) {
	int dx = 0, dy = 0;
	int gravity = NorthWestGravity;

	if(c->size.flags & PWinGravity) {
		gravity = c->size.win_gravity;
	}
	/* y */
	switch (gravity) {
	case StaticGravity:
	case NorthWestGravity:
	case NorthGravity:
	case NorthEastGravity:
		dy = labelh(&def.font);
		break;
	case EastGravity:
	case CenterGravity:
	case WestGravity:
		dy = -(c->rect.height / 2) + labelh(&def.font);
		break;
	case SouthEastGravity:
	case SouthGravity:
	case SouthWestGravity:
		dy = -c->rect.height;
		break;
	default:
		break;
	}
	/* x */
	switch (gravity) {
	case StaticGravity:
	case NorthWestGravity:
	case WestGravity:
	case SouthWestGravity:
		dx = def.border;
		break;
	case NorthGravity:
	case CenterGravity:
	case SouthGravity:
		dx = -(c->rect.width / 2) + def.border;
		break;
	case NorthEastGravity:
	case EastGravity:
	case SouthEastGravity:
		dx = -(c->rect.width + def.border);
		break;
	default:
		break;
	}

	if(invert) {
		dx = -dx;
		dy = -dy;
	}
	c->rect.x += dx;
	c->rect.y += dy;
}

void
manage_client(Client *c) {
	XTextProperty tags;
	Client *trans;

	tags.nitems = 0;
	XGetTextProperty(blz.dpy, c->win, &tags, tags_atom);
	if(c->trans && (trans = client_of_win(c->trans)))
		strncpy(c->tags, trans->tags, sizeof(c->tags));
	else if(tags.nitems)
		strncpy(c->tags, (char *)tags.value, sizeof(c->tags));
	XFree(tags.value);
	if(!strlen(c->tags))
		apply_rules(c);
	apply_tags(c, c->tags);
	reparent_client(c, c->framewin, c->rect.x, c->rect.y);
	if(!starting)
		update_views();
	map_client(c);
	XMapWindow(blz.dpy, c->framewin);
	XSync(blz.dpy, False);
	if(c->sel->area->view == screen->sel)
		focus_client(c, False);
	flush_masked_events(EnterWindowMask);
}

static int
dummy_error_handler(Display *dpy, XErrorEvent *error) {
	return 0;
}

void
destroy_client(Client *c) {
	char *dummy = nil;
	Client **tc;

	XGrabServer(blz.dpy);
	XSetErrorHandler(dummy_error_handler);
	if(c->frame) {
		c->rect.x = c->sel->rect.x;
		c->rect.y = c->sel->rect.y;
	}
	update_client_views(c, &dummy);
	unmap_client(c);
	reparent_client(c, blz.root, c->rect.x, c->rect.y);
	XFreeGC(blz.dpy, c->gc);
	XDestroyWindow(blz.dpy, c->framewin);
	for(tc=&client; *tc && *tc != c; tc=&(*tc)->next);
	assert(*tc == c);
	*tc = c->next;
	update_views();
	free(c);
	XSync(blz.dpy, False);
	XSetErrorHandler(wmii_error_handler);
	XUngrabServer(blz.dpy);
	flush_masked_events(EnterWindowMask);
	write_event("DestroyClient 0x%x\n", c->win);
}

void
match_sizehints(Client *c, XRectangle *r, Bool floating, BlitzAlign sticky) {
	XSizeHints *s = &c->size;
	unsigned int dx = 2 * def.border;
	unsigned int dy = def.border + labelh(&def.font);
	unsigned int hdiff, wdiff;

	if(floating && (s->flags & PMinSize)) {
		if(r->width < s->min_width + dx) {
			wdiff = (s->min_width + dx) - r->width;
			r->width += wdiff;
			if((sticky & EAST) && !(sticky & WEST))
				r->x -= wdiff;
		}
		if(r->height < s->min_height + dy) {
			hdiff = (s->min_height + dy) - r->height;
			r->height += hdiff;
			if((sticky & SOUTH) && !(sticky & NORTH))
				r->y -= hdiff;
		}
	}
	if(floating && (s->flags & PMaxSize)) {
		if(r->width > s->max_width + dx) {
			wdiff = r->width - (s->max_width + dx);
			r->width -= wdiff;
			if((sticky & EAST) && !(sticky & WEST))
			r->x += wdiff;
		}
		if(r->height > s->max_height + dy) {
			hdiff = r->height - (s->max_height + dy);
			r->height -= hdiff;
			if((sticky & SOUTH) && !(sticky & NORTH))
				r->y += hdiff;
		}
	}
	if(s->flags & PResizeInc) {
		int w = 0, h = 0;
		if(s->flags & PBaseSize) {
			w = s->base_width;
			h = s->base_height;
		} else if(s->flags & PMinSize) {
			/* base_{width,height} default to min_{width,height} */
			w = s->min_width;
			h = s->min_height;
		}
		/* client_width = base_width + i * s->width_inc for an integer i */
		w = r->width - dx - w;
		if(s->width_inc > 0) {
			wdiff = w % s->width_inc;
			r->width -= wdiff;
			if((sticky & EAST) && !(sticky & WEST))
				r->x += wdiff;
		}
		h = r->height - dy - h;
		if(s->height_inc > 0) {
			hdiff = h % s->height_inc;
			r->height -= hdiff;
			if((sticky & SOUTH) && !(sticky & NORTH))
				r->y += hdiff;
		}
	}
}

void
resize_client(Client *c, XRectangle *r) {
	Frame *f;
	Bool floating;

	f = c->sel;
	floating = f->area->floating;

	resize_frame(f, r);

	if(floating) {
		if((c->rect.width == screen->rect.width) &&
		   (c->rect.height == screen->rect.height)) {
			f->rect.x = -def.border;
			f->rect.y = -labelh(&def.font);
		}else{
			check_frame_constraints(&f->rect);
		}
	}

	if(f->area->view == screen->sel)
		XMoveResizeWindow(blz.dpy, c->framewin, f->rect.x,
				f->rect.y, f->rect.width, f->rect.height);
	else
		XMoveResizeWindow(blz.dpy, c->framewin, 2 * screen->rect.width + f->rect.x,
				f->rect.y, f->rect.width, f->rect.height);

	c->rect.x = def.border;
	c->rect.y = labelh(&def.font);
	if((f->area->sel == f) || (f->area->mode != Colstack)) {
		c->rect.width = f->rect.width - 2 * def.border;
		c->rect.height = f->rect.height - def.border - labelh(&def.font);
	}

	XMoveResizeWindow(blz.dpy, c->win, c->rect.x, c->rect.y,
					c->rect.width, c->rect.height);
	configure_client(c);
}

void
newcol_client(Client *c, char *arg) {
	Frame *f = c->sel;
	Area *to, *a = f->area;
	View *v = a->view;

	if(a->floating)
		return;
	if(!f->anext && f == a->frame)
		return;
	if(!strncmp(arg, "prev", 5)) {
		for(to=v->area; to && to->next != a; to=to->next);
		to = new_column(v, to, 0);
		send_to_area(to, a, f);
	}
	else if(!strncmp(arg, "next", 5)) {
		to = new_column(v, a, 0);
		send_to_area(to, a, f);
	}
	else
		return;
	flush_masked_events(EnterWindowMask);
}

void
move_client(Client *c, char *arg) {
	Frame *f = c->sel;
	XRectangle new = f->rect;
	int x, y;

	if(sscanf(arg, "%d %d", &x, &y) != 2)
		return;
	new.x += x;
	new.y += y;
	if(!f->area->floating)
		resize_column(f->client, &new);
	else
		resize_client(f->client, &new);
}

void
size_client(Client *c, char *arg) {
	Frame *f = c->sel;
	XRectangle new = f->rect;
	int w, h;

	if(sscanf(arg, "%d %d", &w, &h) != 2)
		return;
	new.width += w;
	new.height += h;
	if(!f->area->floating)
		resize_column(f->client, &new);
	else
		resize_client(f->client, &new);
}

char *
send_client(Frame *f, char *arg) {
	Area *to, *a;
	Client *c;
	Frame *tf;
	View *v;
	int j;

	a = f->area;
	v = a->view;
	c = f->client;
	if(!strncmp(arg, "toggle", 7)) {
		if(!a->floating)
			to = v->area;
		else if(c->revert && !c->revert->floating)
			to = c->revert;
		else
			to = v->area->next;
		send_to_area(to, a, f);
	}else if(!a->floating) {
		if(!strncmp(arg, "left", 5)) {
			if(a->floating)
				return Ebadvalue;
			for(to=v->area->next; to && a != to->next; to=to->next);
			if(!to && (f->anext || f != a->frame))
					to=new_column(v, v->area, 0);
			if(!to)
				return Ebadvalue;
			send_to_area(to, a, f);
		}
		else if(!strncmp(arg, "right", 5)) {
			if(a->floating)
				return Ebadvalue;
			if(!(to = a->next) && (f->anext || f!= a->frame))
				to = new_column(v, a, 0);
			if(!to)
				return Ebadvalue;
			send_to_area(to, a, f);
		}
		else if(!strncmp(arg, "up", 3)) {
			for(tf=a->frame; tf && tf->anext != f; tf=tf->anext);
			if(!tf)
				return Ebadvalue;
			remove_frame(f);
			insert_frame(tf, f, True);
			arrange_column(a, False);
			focus_client(c, True);
		}
		else if(!strncmp(arg, "down", 5)) {
			if(!f->anext)
				return Ebadvalue;
			remove_frame(f);
			insert_frame(f->anext, f, False);
			arrange_column(a, False);
			focus_client(c, True);
		}
		else {
			if(sscanf(arg, "%d", &j) != 1)
				return Ebadvalue;
			for(to=v->area; to && j; to=to->next, j--);
			send_to_area(to, a, f);
		}
	}else
		return Ebadvalue;
	flush_masked_events(EnterWindowMask);
	if(f->view == screen->sel)
		focus(f->client, True);
	update_views();
	return nil;
}

/* convenience function */
void
focus(Client *c, Bool restack) {
	View *v;
	Frame *f;

	if(!(f = c->sel)) return;
	v = f->area->view;
	arrange_column(f->area, False);
	focus_client(c, restack);
	focus_view(screen, v);
}

void
update_client_views(Client *c, char **tags) {
	int cmp;
	Frame *f;
	Frame **fp = &c->frame;

	while(*fp || *tags) {
		while(*fp && (!*tags || (cmp=strcmp((*fp)->view->name, *tags)) < 0)) {
			f = *fp;
			detach_from_area(f->area, f);
			*fp = f->cnext;
			free(f);
			if(c->sel == f)
				c->sel = *fp;
		}
		if(*tags) {
			if(!*fp || cmp > 0) {
				f = create_frame(c, get_view(*tags));
				if(f->view == screen->sel || !c->sel)
					c->sel = f;
				attach_to_view(f->view, f);
				f->cnext = *fp;
				*fp = f;
			}
			if(*fp) fp=&(*fp)->cnext;
			tags++;
		}
	}
	focus_view(screen, screen->sel);
}

static int
compare_tags(const void *a, const void *b) {
	return strcmp(*(char **)a, *(char **)b);
}

void
apply_tags(Client *c, const char *tags) {
	unsigned int i, j, n;
	int len;
	char buf[256];
	char *toks[32];

	strncpy(buf, tags, sizeof(buf));
	trim(buf, " \t/");
	if(!(n = ixp_tokenize(toks, 31, buf, '+')))
		return;
	for(i=0, j=0; i < n; i++) {
		if(!strncmp(toks[i], "~", 2))
			c->floating = True;
		else if(!strncmp(toks[i], "!", 2))
			toks[j++] = view ? screen->sel->name : "nil";
		else if(strncmp(toks[i], "sel", 4)
				&& strncmp(toks[i], ".", 2)
				&& strncmp(toks[i], "..", 3))
			toks[j++] = toks[i];
	}
	c->tags[0] = '\0';
	qsort(toks, j, sizeof(char *), compare_tags);
	len = sizeof(c->tags);
	if(!j) return;
	for(i=0, n=0; i < j && len > 1; i++)
		if(!n || strcmp(toks[i], toks[n-1])) {
			if(i)
				strncat(c->tags, "+", len);
			len -= strlen(c->tags);
			strncat(c->tags, toks[i], len);
			len -= strlen(c->tags);
			toks[n++] = toks[i];
		}
	toks[n] = nil;
	update_client_views(c, toks);
	XChangeProperty(blz.dpy, c->win, tags_atom, XA_STRING, 8,
			PropModeReplace, (unsigned char *)c->tags, strlen(c->tags));
}

static void
match_tags(Client *c, const char *prop) {
	Rule *r;
	regmatch_t tmpregm;

	for(r=def.tagrules.rule; r; r=r->next)
		if(!regexec(&r->regex, prop, 1, &tmpregm, 0))
			if(!strlen(c->tags) || !strncmp(c->tags, "nil", 4))
				apply_tags(c, r->value);
}

void
apply_rules(Client *c) {
	if(def.tagrules.string)
		match_tags(c, c->props);
	if(!strlen(c->tags))
		apply_tags(c, "nil");
}

char *
message_client(Client *c, char *message) {
	if(!strncmp(message, "kill", 5)) {
		kill_client(c);
		return nil;
	}
	return Ebadcmd;
}