#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/statvfs.h>

char *libpandory_rot13(const char *src) {
  if (src == NULL) {
    return NULL;
  }

  char *result = malloc(strlen(src));

  if (result != NULL) {
    strcpy(result, src);
    char *current_char = result;

    while (*current_char != '\0') {
      // Only increment alphabet characters
      if ((*current_char >= 97 && *current_char <= 122) ||
          (*current_char >= 65 && *current_char <= 90)) {
        if (*current_char > 109 || (*current_char > 77 && *current_char < 91)) {
          // Characters that wrap around to the start of the alphabet
          *current_char -= 13;
        } else {
          // Characters that can be safely incremented
          *current_char += 13;
        }
      }
      current_char++;
    }
  }
  return result;
}

int isReadonly(char const *path)
{
    struct statvfs info;
    statvfs(path, &info);
    return ((info.f_flag & ST_RDONLY) > 0);
}

void libpandory_lefcheck(void) {
  printf("TeamPandory - Pandory500 - by emuchicken and dajoho\n");

  if (!isReadonly("/")) {
      printf("[WARNING]: Your system currently has a writeable NAND storage. This may have been caused by another modification. Pandory will now exit.\n");
      exit(1);
  }

  char fname[80];
  strcpy(fname, libpandory_rot13("/zag/Cnaqbel/.sf/cnaqbel.fdkm"));
  int chk = 0;
  if (access(fname, F_OK) == 0) {
    struct stat st;
    int size;
    stat(fname, &st);
    size = st.st_size;
    if (size > 100000001) {
      chk = 1;
    }
  }
  if (chk == 0) {
    printf("Shared libraries not found.\n");
    exit(1);
  }
}