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/* $Id$ */

/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <sys/types.h>

#include <string.h>

#include "tmux.h"

/*
* Recalculate window and session sizes.
*
* Every session has the size of the smallest client it is attached to and
* every window the size of the smallest session it is attached to.
*
* So, when a client is resized or a session attached to or detached from a
* client, the window sizes must be recalculated. For each session, find the
* smallest client it is attached to, and resize it to that size. Then for
* every window, find the smallest session it is attached to, resize it to that
* size and clear and redraw every client with it as the current window.
*
* This is quite inefficient - better/additional data structures are needed
* to make it better.
*
* As a side effect, this function updates the SESSION_UNATTACHED flag. This
* flag is necessary to make sure unattached sessions do not limit the size of
* windows that are attached both to them and to other (attached) sessions.
*/

void
recalculate_sizes(void)
{
struct session *s;
struct client *c;
struct window *w;
struct window_pane *wp;
u_int i, j, ssx, ssy, has, limit;
int flag;

RB_FOREACH(s, sessions, &sessions) {
ssx = ssy = UINT_MAX;
for (j = 0; j < ARRAY_LENGTH(&clients); j++) {
c = ARRAY_ITEM(&clients, j);
if (c == NULL || c->flags & CLIENT_SUSPENDED)
continue;
if (c->session == s) {
if (c->tty.sx < ssx)
ssx = c->tty.sx;
if (c->tty.sy < ssy)
ssy = c->tty.sy;
}
}
if (ssx == UINT_MAX || ssy == UINT_MAX) {
s->flags |= SESSION_UNATTACHED;
continue;
}
s->flags &= ~SESSION_UNATTACHED;

if (options_get_number(&s->options, "status")) {
if (ssy == 0)
ssy = 1;
else
ssy--;
}
if (s->sx == ssx && s->sy == ssy)
continue;

log_debug(
"session size %u,%u (was %u,%u)", ssx, ssy, s->sx, s->sy);

s->sx = ssx;
s->sy = ssy;
}

for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
w = ARRAY_ITEM(&windows, i);
if (w == NULL)
continue;
flag = options_get_number(&w->options, "aggressive-resize");

ssx = ssy = UINT_MAX;
RB_FOREACH(s, sessions, &sessions) {
if (s->flags & SESSION_UNATTACHED)
continue;
if (flag)
has = s->curw->window == w;
else
has = session_has(s, w) != NULL;
if (has) {
if (s->sx < ssx)
ssx = s->sx;
if (s->sy < ssy)
ssy = s->sy;
}
}
if (ssx == UINT_MAX || ssy == UINT_MAX)
continue;

limit = options_get_number(&w->options, "force-width");
if (limit != 0 && ssx > limit)
ssx = limit;
limit = options_get_number(&w->options, "force-height");
if (limit != 0 && ssy > limit)
ssy = limit;

if (w->sx == ssx && w->sy == ssy)
continue;

log_debug(
"window size %u,%u (was %u,%u)", ssx, ssy, w->sx, w->sy);

layout_resize(w, ssx, ssy);
window_resize(w, ssx, ssy);

/*
* If the current pane is now not visible, move to the next
* that is.
*/
wp = w->active;
while (!window_pane_visible(w->active)) {
w->active = TAILQ_PREV(w->active, window_panes, entry);
if (w->active == NULL)
w->active = TAILQ_LAST(&w->panes, window_panes);
if (w->active == wp)
break;
}

server_redraw_window(w);
notify_window_layout_changed(w);
}
}
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