/*
 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.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

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

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

#ifdef HAVE_NL_LANGINFO
#  include <langinfo.h>
#endif

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

#define MIN_SCREEN_WIDTH 20

int term_width, term_height, term_detached;

int term_use_colors;
int term_type;

static int force_colors;
static int resize_dirty;

int term_get_size(int *width, int *height)
{
#ifdef TIOCGWINSZ
	struct winsize ws;

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

	if (ws.ws_row == 0 && ws.ws_col == 0)
		return FALSE;

	*width = ws.ws_col;
        *height = ws.ws_row;

	if (*width < MIN_SCREEN_WIDTH)
		*width = MIN_SCREEN_WIDTH;
	if (*height < 1)
                *height = 1;
	return TRUE;
#else
        return FALSE;
#endif
}

/* Resize the terminal if needed */
void term_resize_dirty(void)
{
        int width, height;

	if (!resize_dirty)
		return;

        resize_dirty = FALSE;

	if (!term_get_size(&width, &height))
		width = height = -1;

	if (height != term_height || width != term_width) {
		term_resize(width, height);
		mainwindows_resize(term_width, term_height);
		term_resize_final(width, height);
	}
}

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

static void cmd_resize(void)
{
	resize_dirty = TRUE;
        term_resize_dirty();
}

static void cmd_redraw(void)
{
	irssi_redraw();
}

static void read_settings(void)
{
        const char *str;
	int old_colors = term_use_colors;
        int old_type = term_type;

        term_auto_detach(settings_get_bool("term_auto_detach"));

        /* set terminal type */
	str = settings_get_str("term_charset");
	if (g_strcasecmp(str, "utf-8") == 0)
		term_type = TERM_TYPE_UTF8;
	else if (g_strcasecmp(str, "big5") == 0)
		term_type = TERM_TYPE_BIG5;
	else
		term_type = TERM_TYPE_8BIT;

	if (old_type != term_type)
                term_set_input_type(term_type);

        /* change color stuff */
	if (force_colors != settings_get_bool("term_force_colors")) {
		force_colors = settings_get_bool("term_force_colors");
		term_force_colors(force_colors);
	}

	term_use_colors = settings_get_bool("colors") &&
		(force_colors || term_has_colors());

	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", "term_force_colors", FALSE);
        settings_add_bool("lookandfeel", "term_auto_detach", FALSE);
        settings_add_bool("lookandfeel", "mirc_blink_fix", FALSE);

	force_colors = FALSE;
	term_use_colors = term_has_colors() && settings_get_bool("colors");
        read_settings();

#if defined (HAVE_NL_LANGINFO) && defined(CODESET)
	if (strcmp(nl_langinfo(CODESET), "UTF-8") == 0) {
		term_type = TERM_TYPE_UTF8;
		term_set_input_type(TERM_TYPE_UTF8);
	}
#endif

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

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

void term_common_deinit(void)
{
	command_unbind("resize", (SIGNAL_FUNC) cmd_resize);
	command_unbind("redraw", (SIGNAL_FUNC) cmd_redraw);
	signal_remove("beep", (SIGNAL_FUNC) term_beep);
	signal_remove("setup changed", (SIGNAL_FUNC) read_settings);
}