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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 <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

struct session *server_next_session(struct session *);
void server_callback_identify(int, short, void *);

void
server_fill_environ(struct session *s, struct environ *env)
{
char var[MAXPATHLEN], *term;
u_int idx;
long pid;

if (s != NULL) {
term = options_get_string(&s->options, "default-terminal");
environ_set(env, "TERM", term);

idx = s->idx;
} else
idx = -1;
pid = getpid();
xsnprintf(var, sizeof var, "%s,%ld,%d", socket_path, pid, idx);
environ_set(env, "TMUX", var);
}

void
server_write_ready(struct client *c)
{
if (c->flags & CLIENT_CONTROL)
return;
server_write_client(c, MSG_READY, NULL, 0);
}

int
server_write_client(
    struct client *c, enum msgtype type, const void *buf, size_t len)
{
struct imsgbuf *ibuf = &c->ibuf;
int error;

if (c->flags & CLIENT_BAD)
return (-1);
log_debug("writing %d to client %d", type, c->ibuf.fd);
error = imsg_compose(ibuf, type, PROTOCOL_VERSION, -1, -1,
(void *) buf, len);
if (error == 1)
server_update_event(c);
return (error == 1 ? 0 : -1);
}

void
server_write_session(
    struct session *s, enum msgtype type, const void *buf, size_t len)
{
struct client *c;
u_int i;

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
if (c->session == s)
server_write_client(c, type, buf, len);
}
}

void
server_redraw_client(struct client *c)
{
c->flags |= CLIENT_REDRAW;
}

void
server_status_client(struct client *c)
{
c->flags |= CLIENT_STATUS;
}

void
server_redraw_session(struct session *s)
{
struct client *c;
u_int i;

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
if (c->session == s)
server_redraw_client(c);
}
}

void
server_redraw_session_group(struct session *s)
{
struct session_group *sg;

if ((sg = session_group_find(s)) == NULL)
server_redraw_session(s);
else {
TAILQ_FOREACH(s, &sg->sessions, gentry)
server_redraw_session(s);
}
}

void
server_status_session(struct session *s)
{
struct client *c;
u_int i;

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
if (c->session == s)
server_status_client(c);
}
}

void
server_status_session_group(struct session *s)
{
struct session_group *sg;

if ((sg = session_group_find(s)) == NULL)
server_status_session(s);
else {
TAILQ_FOREACH(s, &sg->sessions, gentry)
server_status_session(s);
}
}

void
server_redraw_window(struct window *w)
{
struct client *c;
u_int i;

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
if (c->session->curw->window == w)
server_redraw_client(c);
}
w->flags |= WINDOW_REDRAW;
}

void
server_redraw_window_borders(struct window *w)
{
struct client *c;
u_int i;

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
if (c->session->curw->window == w)
c->flags |= CLIENT_BORDERS;
}
}

void
server_status_window(struct window *w)
{
struct session *s;

/*
* This is slightly different. We want to redraw the status line of any
* clients containing this window rather than any where it is the
* current window.
*/

RB_FOREACH(s, sessions, &sessions) {
if (session_has(s, w) != NULL)
server_status_session(s);
}
}

void
server_lock(void)
{
struct client *c;
u_int i;

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
server_lock_client(c);
}
}

void
server_lock_session(struct session *s)
{
struct client *c;
u_int i;

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL || c->session != s)
continue;
server_lock_client(c);
}
}

void
server_lock_client(struct client *c)
{
const char *cmd;
size_t cmdlen;
struct msg_lock_data lockdata;

if (c->flags & CLIENT_SUSPENDED)
return;

cmd = options_get_string(&c->session->options, "lock-command");
cmdlen = strlcpy(lockdata.cmd, cmd, sizeof lockdata.cmd);
if (cmdlen >= sizeof lockdata.cmd)
return;

tty_stop_tty(&c->tty);
tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_SMCUP));
tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_CLEAR));
tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_E3));

c->flags |= CLIENT_SUSPENDED;
server_write_client(c, MSG_LOCK, &lockdata, sizeof lockdata);
}

void
server_kill_window(struct window *w)
{
struct session *s, *next_s;
struct winlink *wl;

next_s = RB_MIN(sessions, &sessions);
while (next_s != NULL) {
s = next_s;
next_s = RB_NEXT(sessions, &sessions, s);

if (session_has(s, w) == NULL)
continue;
while ((wl = winlink_find_by_window(&s->windows, w)) != NULL) {
if (session_detach(s, wl)) {
server_destroy_session_group(s);
break;
} else
server_redraw_session_group(s);
}

if (options_get_number(&s->options, "renumber-windows"))
session_renumber_windows(s);
}
}

int
server_link_window(struct session *src, struct winlink *srcwl,
    struct session *dst, int dstidx, int killflag, int selectflag, char **cause)
{
struct winlink *dstwl;
struct session_group *srcsg, *dstsg;

srcsg = session_group_find(src);
dstsg = session_group_find(dst);
if (src != dst && srcsg != NULL && dstsg != NULL && srcsg == dstsg) {
xasprintf(cause, "sessions are grouped");
return (-1);
}

dstwl = NULL;
if (dstidx != -1)
dstwl = winlink_find_by_index(&dst->windows, dstidx);
if (dstwl != NULL) {
if (dstwl->window == srcwl->window) {
xasprintf(cause, "same index: %d", dstidx);
return (-1);
}
if (killflag) {
/*
* Can't use session_detach as it will destroy session
* if this makes it empty.
*/
notify_window_unlinked(dst, dstwl->window);
dstwl->flags &= ~WINLINK_ALERTFLAGS;
winlink_stack_remove(&dst->lastw, dstwl);
winlink_remove(&dst->windows, dstwl);

/* Force select/redraw if current. */
if (dstwl == dst->curw) {
selectflag = 1;
dst->curw = NULL;
}
}
}

if (dstidx == -1)
dstidx = -1 - options_get_number(&dst->options, "base-index");
dstwl = session_attach(dst, srcwl->window, dstidx, cause);
if (dstwl == NULL)
return (-1);

if (selectflag)
session_select(dst, dstwl->idx);
server_redraw_session_group(dst);

return (0);
}

void
server_unlink_window(struct session *s, struct winlink *wl)
{
if (session_detach(s, wl))
server_destroy_session_group(s);
else
server_redraw_session_group(s);
}

void
server_destroy_pane(struct window_pane *wp)
{
struct window *w = wp->window;
int old_fd;
struct screen_write_ctx ctx;
struct grid_cell gc;

old_fd = wp->fd;
if (wp->fd != -1) {
bufferevent_free(wp->event);
close(wp->fd);
wp->fd = -1;
}

if (options_get_number(&w->options, "remain-on-exit")) {
if (old_fd == -1)
return;
screen_write_start(&ctx, wp, &wp->base);
screen_write_scrollregion(&ctx, 0, screen_size_y(ctx.s) - 1);
screen_write_cursormove(&ctx, 0, screen_size_y(ctx.s) - 1);
screen_write_linefeed(&ctx, 1);
memcpy(&gc, &grid_default_cell, sizeof gc);
gc.attr |= GRID_ATTR_BRIGHT;
screen_write_puts(&ctx, &gc, "Pane is dead");
screen_write_stop(&ctx);
wp->flags |= PANE_REDRAW;
return;
}

layout_close_pane(wp);
window_remove_pane(w, wp);

if (TAILQ_EMPTY(&w->panes))
server_kill_window(w);
else
server_redraw_window(w);
}

void
server_destroy_session_group(struct session *s)
{
struct session_group *sg;

if ((sg = session_group_find(s)) == NULL)
server_destroy_session(s);
else {
TAILQ_FOREACH(s, &sg->sessions, gentry)
server_destroy_session(s);
TAILQ_REMOVE(&session_groups, sg, entry);
free(sg);
}
}

struct session *
server_next_session(struct session *s)
{
struct session *s_loop, *s_out;

s_out = NULL;
RB_FOREACH(s_loop, sessions, &sessions) {
if (s_loop == s)
continue;
if (s_out == NULL ||
timercmp(&s_loop->activity_time, &s_out->activity_time, <))
s_out = s_loop;
}
return (s_out);
}

void
server_destroy_session(struct session *s)
{
struct client *c;
struct session *s_new;
u_int i;

if (!options_get_number(&s->options, "detach-on-destroy"))
s_new = server_next_session(s);
else
s_new = NULL;

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session != s)
continue;
if (s_new == NULL) {
c->session = NULL;
c->flags |= CLIENT_EXIT;
} else {
c->last_session = NULL;
c->session = s_new;
notify_attached_session_changed(c);
session_update_activity(s_new);
server_redraw_client(c);
}
}
recalculate_sizes();
}

void
server_check_unattached (void)
{
struct session *s;

/*
* If any sessions are no longer attached and have destroy-unattached
* set, collect them.
*/
RB_FOREACH(s, sessions, &sessions) {
if (!(s->flags & SESSION_UNATTACHED))
continue;
if (options_get_number (&s->options, "destroy-unattached"))
session_destroy(s);
}
}

void
server_set_identify(struct client *c)
{
struct timeval tv;
int delay;

delay = options_get_number(&c->session->options, "display-panes-time");
tv.tv_sec = delay / 1000;
tv.tv_usec = (delay % 1000) * 1000L;

if (event_initialized (&c->identify_timer))
evtimer_del(&c->identify_timer);
evtimer_set(&c->identify_timer, server_callback_identify, c);
evtimer_add(&c->identify_timer, &tv);

c->flags |= CLIENT_IDENTIFY;
c->tty.flags |= (TTY_FREEZE|TTY_NOCURSOR);
server_redraw_client(c);
}

void
server_clear_identify(struct client *c)
{
if (c->flags & CLIENT_IDENTIFY) {
c->flags &= ~CLIENT_IDENTIFY;
c->tty.flags &= ~(TTY_FREEZE|TTY_NOCURSOR);
server_redraw_client(c);
}
}

/* ARGSUSED */
void
server_callback_identify(unused int fd, unused short events, void *data)
{
struct client *c = data;

server_clear_identify(c);
}

void
server_update_event(struct client *c)
{
short events;

events = 0;
if (!(c->flags & CLIENT_BAD))
events |= EV_READ;
if (c->ibuf.w.queued > 0)
events |= EV_WRITE;
if (event_initialized(&c->event))
event_del(&c->event);
event_set(&c->event, c->ibuf.fd, events, server_client_callback, c);
event_add(&c->event, NULL);
}

/* Push stdout to client if possible. */
void
server_push_stdout(struct client *c)
{
struct msg_stdout_data data;
size_t size;

size = EVBUFFER_LENGTH(c->stdout_data);
if (size == 0)
return;
if (size > sizeof data.data)
size = sizeof data.data;

memcpy(data.data, EVBUFFER_DATA(c->stdout_data), size);
data.size = size;

if (server_write_client(c, MSG_STDOUT, &data, sizeof data) == 0)
evbuffer_drain(c->stdout_data, size);
}

/* Push stderr to client if possible. */
void
server_push_stderr(struct client *c)
{
struct msg_stderr_data data;
size_t size;

size = EVBUFFER_LENGTH(c->stderr_data);
if (size == 0)
return;
if (size > sizeof data.data)
size = sizeof data.data;

memcpy(data.data, EVBUFFER_DATA(c->stderr_data), size);
data.size = size;

if (server_write_client(c, MSG_STDERR, &data, sizeof data) == 0)
evbuffer_drain(c->stderr_data, size);
}

/* Set stdin callback. */
int
server_set_stdin_callback(struct client *c, void (*cb)(struct client *, int,
    void *), void *cb_data, char **cause)
{
if (c == NULL) {
*cause = xstrdup("no client with stdin");
return (-1);
}
if (c->flags & CLIENT_TERMINAL) {
*cause = xstrdup("stdin is a tty");
return (-1);
}
if (c->stdin_callback != NULL) {
*cause = xstrdup("stdin in use");
return (-1);
}

c->stdin_callback_data = cb_data;
c->stdin_callback = cb;

c->references++;

if (c->stdin_closed)
c->stdin_callback (c, 1, c->stdin_callback_data);

server_write_client(c, MSG_STDIN, NULL, 0);

return (0);
}
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