/*

 * mainloop.c - main loop

 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */

#include "aconfig.h"

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <poll.h>

#include <panel.h>

#include <alsa/asoundlib.h>

#include "mem.h"

#include "die.h"

#include "colors.h"

#include "widget.h"

#include "mixer_widget.h"

#include "mixer_display.h"

#include "mixer_controls.h"

#include "mainloop.h"

static WINDOW *curses_initialized;

static void black_hole_error_handler(const char *file, int line,

				     const char *function, int err,

				     const char *fmt, ...)

{

}

void initialize_curses(bool use_color)

{

	curses_initialized = initscr();

	cbreak();

	noecho();

#ifdef HAVE_CURSES_ESCDELAY

	set_escdelay(100);

#endif

	window_size_changed(); /* update screen_lines/cols */

	init_colors(use_color);

	snd_lib_error_set_handler(black_hole_error_handler);

}

void app_shutdown(void)

{

	if (curses_initialized) {

		clear();

		refresh();

		curs_set(1);

		endwin();

	}

	mixer_shutdown();

}

void mainloop(void)

{

	struct pollfd *pollfds = NULL;

	int nfds = 0, n;

	const struct widget *active_widget;

	unsigned short revents;

	int key;

	int err;

	for (;;) {

		update_panels();

		doupdate();

		active_widget = get_active_widget();

		if (!active_widget)

			break;

		n = 1 + snd_mixer_poll_descriptors_count(mixer);

		if (n != nfds) {

			free(pollfds);

			nfds = n;

			pollfds = ccalloc(nfds, sizeof *pollfds);

			pollfds[0].fd = fileno(stdin);

			pollfds[0].events = POLLIN;

		}

		err = snd_mixer_poll_descriptors(mixer, &pollfds[1], nfds - 1);

		if (err < 0)

			fatal_alsa_error("cannot get poll descriptors", err);

		n = poll(pollfds, nfds, -1);

		if (n < 0) {

			if (errno == EINTR) {

				pollfds[0].revents = 0;

				doupdate(); /* handle SIGWINCH */

			} else {

				fatal_error("poll error");

			}

		}

		if (pollfds[0].revents & (POLLERR | POLLHUP | POLLNVAL))

			break;

		if (pollfds[0].revents & POLLIN)

			--n;

		if (n > 0) {

			err = snd_mixer_poll_descriptors_revents(mixer, &pollfds[1], nfds - 1, &revents);

			if (err < 0)

				fatal_alsa_error("cannot get poll events", err);

			if (revents & (POLLERR | POLLNVAL))

				close_mixer_device();

			else if (revents & POLLIN)

				snd_mixer_handle_events(mixer);

		}

		key = wgetch(active_widget->window);

		while (key != ERR) {

#ifdef KEY_RESIZE

			if (key == KEY_RESIZE)

				window_size_changed();

			else

#endif

				active_widget->handle_key(key);

			active_widget = get_active_widget();

			if (!active_widget)

				break;

			key = wgetch(active_widget->window);

		}

		if (!active_widget)

			break;

		if (controls_changed) {

			controls_changed = FALSE;

			create_controls();

			control_values_changed = FALSE;

			display_controls();

		} else if (control_values_changed) {

			control_values_changed = FALSE;

			display_controls();

		}

	}

	free(pollfds);

}