/*
 * Terminal screen functions
 *
 * Copyright (C) 2019  Patrick McDermott
 *
 * This file is part of Timeteller.
 *
 * Timeteller 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 3 of the License, or
 * (at your option) any later version.
 *
 * Timeteller 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 Timeteller.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "screen.h"

#include <assert.h>
#include <curses.h>
#include <errno.h>
#include <poll.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>

#include "clock.h"
#include "speech.h"

struct screen {
	WINDOW       *win;
	struct clock *clock;
};

struct screen *
screen_new(void)
{
	struct screen *screen;

	screen = calloc(1, sizeof(*screen));
	if (screen == NULL) {
		return NULL;
	}

	screen->win = initscr();  /* On failure, does not return.  */
	if (noecho() == ERR || raw() == ERR || nodelay(screen->win, TRUE)) {
		free(screen);
		return NULL;
	}
	curs_set(0);  /* Ignore errors.  */

	if (has_colors() && start_color() != ERR) {
		init_pair(1, COLOR_RED, COLOR_BLACK);
		wcolor_set(screen->win, 1, NULL);
	}

	screen->clock = clock_new(screen->win);
	if (screen->clock == NULL) {
		free(screen);
		return NULL;
	}

	return screen;
}

bool
screen_main(struct screen *screen, struct speech *speech)
{
	struct pollfd fds[] = {
		{ .fd = STDIN_FILENO, .events = POLLIN|POLLERR, .revents = 0 },
	};
	bool          play;

	assert(screen);
	assert(speech);

	for (;;) {
		switch (wgetch(screen->win)) {
			case ERR:
				break;
			case 'q':
				return true;
			case 0x1B:  /* ASCII ESC */
				if (wgetch(screen->win) == ERR) {  /* Esc key */
					return true;
				}
				/* Probably a CSI sequence */
				while (wgetch(screen->win) != ERR);
				play = true;
				break;
#ifdef KEY_RESIZE
			case KEY_RESIZE:
				clock_clear(screen->clock);
				clock_size(screen->clock);
				break;
#endif
			default:
				/* Just to be safe: */
				while (wgetch(screen->win) != ERR);
				play = true;
		}

		clock_draw(screen->clock);
		refresh();

		if (play) {
			speech_play_time(speech);
			play = false;
		} else {
			while (poll(fds, 1, 1000) < 0 && (errno == EINTR ||
						errno == EAGAIN)) {
				continue;
			}
		}
	}

	return true;
}

struct screen *
screen_destroy(struct screen **screen_p)
{
	struct screen *screen;

	assert(screen_p && *screen_p);

	screen = *screen_p;

	delwin(screen->win);
	endwin();

	clock_destroy(&screen->clock);

	free(screen);
	return screen = NULL;
}