/* $OpenBSD$ */

/*
 * Copyright (c) 2012 George Nachman <tmux@georgester.com>
 *
 * 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 <sys/queue.h>

#include <stdlib.h>

#include "tmux.h"

enum notify_type {
	NOTIFY_WINDOW_LAYOUT_CHANGED,
	NOTIFY_WINDOW_UNLINKED,
	NOTIFY_WINDOW_LINKED,
	NOTIFY_WINDOW_RENAMED,
	NOTIFY_ATTACHED_SESSION_CHANGED,
	NOTIFY_SESSION_RENAMED,
	NOTIFY_SESSION_CREATED,
	NOTIFY_SESSION_CLOSED
};

static const char *notify_hooks[] = {
	"window-layout-changed",
	NULL, /* "window-unlinked", */
	NULL, /* "window-linked", */
	"window-renamed",
	NULL, /* "attached-session-changed", */
	"session-renamed",
	NULL, /* "session-created", */
	NULL, /* "session-closed" */
};

struct notify_entry {
	enum notify_type	 type;

	struct client		*client;
	struct session		*session;
	struct window		*window;

	TAILQ_ENTRY(notify_entry) entry;
};
TAILQ_HEAD(notify_queue, notify_entry);
static struct notify_queue notify_queue = TAILQ_HEAD_INITIALIZER(notify_queue);

static void	notify_add(enum notify_type, struct client *, struct session *,
		    struct window *);

static void
notify_hook(struct notify_entry *ne)
{
	const char		*name;
	struct cmd_find_state	 fs;
	struct hook		*hook;
	struct cmd_q		*hooks_cmdq;

	name = notify_hooks[ne->type];
	if (name == NULL)
		return;

	cmd_find_clear_state(&fs, NULL, 0);
	if (ne->session != NULL && ne->window != NULL)
		cmd_find_from_session_window(&fs, ne->session, ne->window);
	else if (ne->window != NULL)
		cmd_find_from_window(&fs, ne->window);
	else if (ne->session != NULL)
		cmd_find_from_session(&fs, ne->session);
	if (cmd_find_empty_state(&fs) || !cmd_find_valid_state(&fs))
		return;

	hook = hooks_find(fs.s->hooks, name);
	if (hook == NULL)
		return;
	log_debug("notify hook %s", name);

	hooks_cmdq = cmdq_new(NULL);
	hooks_cmdq->flags |= CMD_Q_NOHOOKS;

	cmd_find_copy_state(&hooks_cmdq->current, &fs);
	hooks_cmdq->parent = NULL;

	cmdq_run(hooks_cmdq, hook->cmdlist, NULL);
	cmdq_free(hooks_cmdq);
}

static void
notify_add(enum notify_type type, struct client *c, struct session *s,
    struct window *w)
{
	struct notify_entry	*ne;

	ne = xcalloc(1, sizeof *ne);
	ne->type = type;
	ne->client = c;
	ne->session = s;
	ne->window = w;
	TAILQ_INSERT_TAIL(&notify_queue, ne, entry);

	if (c != NULL)
		c->references++;
	if (s != NULL)
		s->references++;
	if (w != NULL)
		w->references++;
}

void
notify_drain(void)
{
	struct notify_entry	*ne, *ne1;

	TAILQ_FOREACH_SAFE(ne, &notify_queue, entry, ne1) {
		switch (ne->type) {
		case NOTIFY_WINDOW_LAYOUT_CHANGED:
			control_notify_window_layout_changed(ne->window);
			break;
		case NOTIFY_WINDOW_UNLINKED:
			control_notify_window_unlinked(ne->session, ne->window);
			break;
		case NOTIFY_WINDOW_LINKED:
			control_notify_window_linked(ne->session, ne->window);
			break;
		case NOTIFY_WINDOW_RENAMED:
			control_notify_window_renamed(ne->window);
			break;
		case NOTIFY_ATTACHED_SESSION_CHANGED:
			control_notify_attached_session_changed(ne->client);
			break;
		case NOTIFY_SESSION_RENAMED:
			control_notify_session_renamed(ne->session);
			break;
		case NOTIFY_SESSION_CREATED:
			control_notify_session_created(ne->session);
			break;
		case NOTIFY_SESSION_CLOSED:
			control_notify_session_close(ne->session);
			break;
		}
		TAILQ_REMOVE(&notify_queue, ne, entry);
		notify_hook(ne);

		if (ne->client != NULL)
			server_client_unref(ne->client);
		if (ne->session != NULL)
			session_unref(ne->session);
		if (ne->window != NULL)
			window_remove_ref(ne->window);
		free(ne);
	}
}

void
notify_input(struct window_pane *wp, struct evbuffer *input)
{
	struct client	*c;

	TAILQ_FOREACH(c, &clients, entry) {
		if (c->flags & CLIENT_CONTROL)
			control_notify_input(c, wp, input);
	}
}

void
notify_window_layout_changed(struct window *w)
{
	notify_add(NOTIFY_WINDOW_LAYOUT_CHANGED, NULL, NULL, w);
	notify_drain();
}

void
notify_window_unlinked(struct session *s, struct window *w)
{
	notify_add(NOTIFY_WINDOW_UNLINKED, NULL, s, w);
	notify_drain();
}

void
notify_window_linked(struct session *s, struct window *w)
{
	notify_add(NOTIFY_WINDOW_LINKED, NULL, s, w);
	notify_drain();
}

void
notify_window_renamed(struct window *w)
{
	notify_add(NOTIFY_WINDOW_RENAMED, NULL, NULL, w);
	notify_drain();
}

void
notify_attached_session_changed(struct client *c)
{
	notify_add(NOTIFY_ATTACHED_SESSION_CHANGED, c, NULL, NULL);
	notify_drain();
}

void
notify_session_renamed(struct session *s)
{
	notify_add(NOTIFY_SESSION_RENAMED, NULL, s, NULL);
	notify_drain();
}

void
notify_session_created(struct session *s)
{
	notify_add(NOTIFY_SESSION_CREATED, NULL, s, NULL);
	notify_drain();
}

void
notify_session_closed(struct session *s)
{
	notify_add(NOTIFY_SESSION_CLOSED, NULL, s, NULL);
	notify_drain();
}