#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <inttypes.h>
#include <fcntl.h>

#include <hexagram/can.h>
#include <hexagram/capture.h>

static void usage(int argc, char **argv, const char *message, ...) {
    if (message) {
        va_list args;

        va_start(args, message);
        vfprintf(stderr, message, args);
        va_end(args);
    }

    fprintf(stderr, "usage: %s canif [file.can]\n", argv[0]);

    exit(1);
}



int main(int argc, char **argv) {
    hexagram_can_if *can_if;
    hexagram_capture *capture;

    if (argc == 2) {
        if ((capture = hexagram_capture_open_fd(fileno(stdin), O_WRONLY)) == NULL) {
            perror("hexagram_capture_open_fd()");

            goto error_capture_open;
        }
    } else if (argc == 3) {
        if ((capture = hexagram_capture_open_file(argv[2], O_CREAT | O_TRUNC | O_WRONLY)) == NULL) {
            perror("hexagram_capture_open_file()");

            goto error_capture_open;
        }
    } else {
        usage(argc, argv, NULL);
        exit(1);
    }

    if ((can_if = hexagram_can_if_open(argv[1])) == NULL) {
        perror("hexagram_can_if_open()");

        goto error_can_if_open;
    }

    if (hexagram_capture_save(capture, can_if) < 0) {
        goto error_capture_save;
    }

    hexagram_can_if_close(can_if);

    if (argc == 3) {
        hexagram_capture_close(capture);
    } else {
        hexagram_capture_destroy(capture);
    }

    return 0;

error_capture_save:
    hexagram_can_if_close(can_if);

error_can_if_open:
    if (argc == 3) {
        hexagram_capture_close(capture);
    } else {
        hexagram_capture_destroy(capture);
    }

error_capture_open:
    return 1;
}