/*
  FUSE: Filesystem in Userspace
  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>
  Copyright (C) 2011       Sebastian Pipping <sebastian@pipping.org>

  ICFS: Interactively Controlled File System
  Copyright (C) 2024-2025  Fedir Kovalov

  This program can be distributed under the terms of the GNU GPLv2.
  See the file LICENSE.
*/

#include <string.h>
#define FUSE_USE_VERSION 31

#define _GNU_SOURCE

#include <fuse3/fuse.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

#include "fuse_operations.h"
#include "sourcefs.h"
#include "ui-socket.h"

const char *mountpoint = NULL;

int main(int argc, char *argv[]) {
  if (argc < 3) {
    fprintf(stderr, "Usage: icfs <FUSE arguments> [target directory] [path to "
                    "the permanent permissions database] <ICFS "
                    "arguments>\n\t--no-perm-on-create - do not give any "
                    "access permissions on file creation"
                    "(incompatible with --temp-on-create)\n\t--perm-on-create "
                    "- automatically give permanent access permission to files "
                    "a process creates "
                    "(incompatible with --no-perm-on-create)\n");
    return EXIT_FAILURE;
  }

  if ((0 == strcmp(argv[argc - 1], "--no-perm-on-create") &&
       0 == strcmp(argv[argc - 2], "--temp-on-create")) ||
      (0 == strcmp(argv[argc - 2], "--no-perm-on-create") &&
       0 == strcmp(argv[argc - 1], "--temp-on-create"))) {
    fprintf(stderr, "Usage: icfs <FUSE arguments> [target directory] [path to "
                    "the permanent permissions database] <ICFS "
                    "arguments>\n\t--no-perm-on-create - do not give any "
                    "access permissions on file creation"
                    "(incompatible with --temp-on-create)\n\t--perm-on-create "
                    "- automatically give permanent access permission to files "
                    "a process creates "
                    "(incompatible with --no-perm-on-create)\n");
    return EXIT_FAILURE;
  }

  // if umask != 0, the filesystem will create files with more restrictive
  // permissions than it's caller reqested
  umask(0);

  if (0 == strcmp(argv[argc - 1], "--no-perm-on-create")) {
    set_auto_create_perm(0);
    argc--;
  }
  if (0 == strcmp(argv[argc - 1], "--perm-on-create")) {
    set_auto_create_perm(GRANT_PERM);
    argc--;
  }

  // ui socket should always be initialized before anything else, since it
  // handles the setuid bits!
  int ret = init_ui_socket(argv[argc - 1]);
  if (ret != 0) {
    fprintf(stderr, "[ICFS] Could not initalize ui-socket.\n");
    exit(EXIT_FAILURE);
  }

  mountpoint = realpath(argv[argc - 2], NULL);

  ret = source_init(mountpoint);
  if (ret != 0) {
    perror("[ICFS] source_init");
    exit(EXIT_FAILURE);
  }

  ret = fuse_main(argc - 1, argv, get_fuse_operations(), NULL);

  free((void *)mountpoint);
  source_destroy();
  destroy_ui_socket();
  return ret;
}