/*
 term.c : irssi

    Copyright (C) 2001 Timo Sirainen

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "module.h"
#include "signals.h"
#include "commands.h"
#include "settings.h"

#include "term.h"
#include "mainwindows.h"

#ifdef HAVE_SYS_IOCTL_H
#  include <sys/ioctl.h>
#endif
#include <signal.h>
#include <termios.h>

#define RESIZE_TIMEOUT 500 /* how often to check if the terminal has been resized */
#define MIN_SCREEN_WIDTH 20

int term_use_colors;

#ifdef SIGWINCH
static int resize_timeout_tag;
#endif
static int resize_needed;

static int resize_timeout(void)
{
#ifdef TIOCGWINSZ
	struct winsize ws;
#endif

	if (!resize_needed)
		return TRUE;

        resize_needed = FALSE;

#ifdef TIOCGWINSZ
	/* Get new window size */
	if (ioctl(0, TIOCGWINSZ, &ws) < 0)
		return TRUE;

	if (ws.ws_row == term_height && ws.ws_col == term_width) {
		/* Same size, abort. */
		return TRUE;
	}

	if (ws.ws_col < MIN_SCREEN_WIDTH)
		ws.ws_col = MIN_SCREEN_WIDTH;

        term_resize(ws.ws_col, ws.ws_row);
#else
        term_resize(-1, -1);
#endif
	mainwindows_resize(term_width, term_height);

	return TRUE;
}

#ifdef SIGWINCH
static void sig_winch(int p)
{
        resize_needed = TRUE;
}
#endif

static void cmd_resize(void)
{
	resize_needed = TRUE;
	resize_timeout();
}

static void read_settings(void)
{
	int old_colors = term_use_colors;

	if (settings_get_bool("force_colors"))
		term_use_colors = TRUE;
	else {
		term_use_colors = settings_get_bool("colors");
		if (term_use_colors && !term_has_colors())
			term_use_colors = FALSE;
	}

	if (term_use_colors != old_colors)
		irssi_redraw();
}

void term_common_init(void)
{
#ifdef SIGWINCH
	struct sigaction act;
#endif
	settings_add_bool("lookandfeel", "colors", TRUE);
	settings_add_bool("lookandfeel", "force_colors", FALSE);
	term_use_colors = settings_get_bool("colors");

	signal_add("beep", (SIGNAL_FUNC) term_beep);
	signal_add("setup changed", (SIGNAL_FUNC) read_settings);
	command_bind("resize", NULL, (SIGNAL_FUNC) cmd_resize);

#ifdef SIGWINCH
	sigemptyset (&act.sa_mask);
	act.sa_flags = 0;
	act.sa_handler = sig_winch;
	sigaction(SIGWINCH, &act, NULL);

	resize_timeout_tag = g_timeout_add(RESIZE_TIMEOUT,
					   (GSourceFunc) resize_timeout, NULL);
#endif
}

void term_common_deinit(void)
{
#ifdef SIGWINCH
	g_source_remove(resize_timeout_tag);
#endif

	command_unbind("resize", (SIGNAL_FUNC) cmd_resize);
	signal_remove("beep", (SIGNAL_FUNC) term_beep);
	signal_remove("setup changed", (SIGNAL_FUNC) read_settings);
}