#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "dosfs.h"

static void usage(void) __dead;
static int  list_img(char *);

int
main(int argc, char *argv[])
{
    int ch, list_mode;

    setprogname(argv[0]);

    list_mode = 0;
    while ((ch = getopt(argc, argv, "l")) != -1) {
        switch (ch) {
        case 'l':
            list_mode = 1;
            break;
        case '?':
        default:
            usage();
            /* NOTREACHED */
        }
    }
    argc -= optind;
    argv += optind;

    if (argc != 1) {
        usage();
        /* NOTREACHED */
    }

    if (list_mode) {
        return list_img(argv[0]);
    }

    /* TODO: rest of the owl */
    fprintf(stderr, "not yet implemented :(\n");

    return EXIT_FAILURE;
}

static int
list_img(char *path)
{
    dosfs_t img = { 0 };
    dosfile_t *rootdir, *cur;
    int res;

    res = open_image(path, O_RDONLY, &img);
    if (res != 0) {
        fprintf(stderr, "err: couldn't open image (errno %d)\n", res);
        return EXIT_FAILURE;
    }

    rootdir = dos_listdir(&img, img.root_loc);
    if (rootdir == NULL) {
        perror("couldn't read root dir");
        close_image(&img);
        return EXIT_FAILURE;
    }

    printf("OEM ID: %.8s\nDirectory listing:\n", img.ib.oem_id);
    for (cur = rootdir; cur->next != NULL; cur = cur->next) {
        printf("  %s.%s\n", cur->fname, cur->fext);
    }

    dos_freedir(rootdir);
    rootdir = cur = NULL;    
    close_image(&img);

    return EXIT_SUCCESS;
}

static void
usage(void)
{
    fprintf(stderr, "usage: %s [-l] image\n", getprogname());
    exit(EXIT_FAILURE);
}