/*
 * Speech 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 "speech.h"

#include <assert.h>
#include <stdlib.h>
#include <time.h>

#include <flite/flite.h>

cst_voice *register_cmu_us_slt(const char *voxdir);

struct speech {
	cst_voice *voice;
};

struct speech *
speech_new(void)
{
	struct speech *speech;

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

	flite_init();
	speech->voice = register_cmu_us_slt(NULL);
	if (speech->voice == NULL) {
		free(speech);
		return NULL;
	}

	return speech;
}

float
speech_play_time(const struct speech *speech)
{
	time_t     t = 0;
	struct tm *tm;
	char       buffer[6];

	assert(speech);

	time(&t);
	if (t < (time_t) 0) {
		return -1;
	}

	tm = localtime(&t);
	if (tm == NULL) {
		return -1;
	}

	strftime(buffer, sizeof(buffer) / sizeof(buffer[0]), "%H:%M", tm);
	/* Drop leading zero, for nicer pronunciations.  The IANA Time Zone
	 * Database and GNU C Library strftime() implementations offer "%k", but
	 * it's not in C or POSIX.  */
	if (buffer[0] == '0') {
		buffer[0] = ' ';
	}

	return flite_text_to_speech(buffer, speech->voice, "play");
}

struct speech *
speech_destroy(struct speech **speech_p)
{
	struct speech *speech;

	assert(speech_p && *speech_p);

	speech = *speech_p;

	free(speech);
	return speech = NULL;
}