#include <stdio.h>
#include <unistd.h>
#include <sys/epoll.h>

#include "options.h"
#include "baud.h"
#include "debug.h"

int main(int argc, char *argv[])
{
	struct epoll_event ev;
	struct plotter_options options;
	int fd, baud, ret;
	int epoll_fd;
	char buf[256];


	if (read_args(argc, argv, &options))
		return 1;

	baud = options.baud_rate;
	fd = open_at_baud(options.device_path, &baud);
	if (fd < 0)
		return 1;

	if (baud != options.baud_rate) {
		pr_err("Failed to set baudrate to %d, only got %d\n",
			options.baud_rate, baud);
		close(fd);
		return 1;
	}

	epoll_fd = epoll_create(1);

	ev.events = EPOLLIN;
	ev.data.fd = fd;
	if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
		pr_err("epoll_ctl: %m\n");
		return 1;
	}

	while (1) {
		ret = epoll_wait(epoll_fd, &ev, 1, -1);
		if (ret == 0)
			continue;

		if (ret < 0) {
			pr_err("epoll: %m\n");
			return 1;
		}

		ret = read(fd, buf, sizeof(buf));
		if (read < 0) {
			pr_err("read: %m\n");
			break;
		}

		if (ret == 0) {
			pr_err("Read EOF, stopping\n");
			break;
		}

		ret = write(1, buf, ret);
		if (read < 0) {
			pr_err("write: %m\n");
			break;
		}
	}

	close(fd);
	return 0;
}