/*
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2025 Goran Mekić
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/event.h>

#include "oss.h"

int
main(int argc, char *argv[])
{
        struct config config = {
                .device = "/dev/dsp",
                .mode = O_RDWR,
                .format = AFMT_S32_NE,
                .sample_rate = 48000,
        };
        struct kevent event = {};
        int rc, bytes, kq;

        oss_init(&config);
        bytes = config.buffer_info.bytes;

        if ((kq = kqueue()) < 0)
                err(1, "Failed to allocate kqueue");
        EV_SET(&event, config.fd, EVFILT_WRITE, EV_ADD | EV_CLEAR, 0, 0, 0);
        if (kevent(kq, &event, 1, NULL, 0, NULL) < 0)
                err(1, "Failed to register kevent");
        for (;;) {
                if (kevent(kq, NULL, 0, &event, 1, NULL) < 0) {
                        warn("Event error");
                        break;
                }
                if (event.flags & EV_ERROR) {
                        warn("Event error: %s", strerror(event.data));
                        break;
                }
                if ((rc = read(config.fd, config.buf, bytes)) < bytes) {
                        warn("Requested %d bytes, but read %d!\n", bytes, rc);
                        break;
                }
                if ((rc = write(config.fd, config.buf, bytes)) < bytes) {
                        warn("Requested %d bytes, but wrote %d!\n", bytes, rc);
                        break;
                }
        }
        EV_SET(&event, config.fd, EVFILT_WRITE, EV_DELETE, 0, 0, 0);
        if (kevent(kq, &event, 1, NULL, 0, NULL) < 0)
                err(1, "Failed to unregister kevent");
        close(kq);

        free(config.buf);
        close(config.fd);

        return (0);
}