#define _GNU_SOURCE

#include "encryption.h"
#include "shared.h"

#include <sodium.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <stdio.h>

int checkSodium(void) {
    int ret = sodium_init();
    if(ret < 0)
        error(1, ENOTSUP, "Couldn't initialize sodium for some reason. Quitting...");

    return ret;
}

// To encrypt:
// 1- Create a temp file with the correct name in the root folder of the partition being encrypted
    // 1.1- Detect the partition and find the root folder
    // 1.2- Create the temp file with the correct name 
// 2- Encrypt the file's contents to the temp file
    // 2.1- Open the file
    // 2.2- Stream the file's contents into some encryption algo
    // 2.3- Pipe the output of the encryption into the temp file
// 3- Once the file has been encrypted, hard link it back to the original location
// 4- Delete the original file
// 5- Delete the temp file


int maketmp(const char *dest) {
    int fd = open(dest, (O_TMPFILE | O_WRONLY | O_CLOEXEC | O_SYNC), (S_IRUSR | S_IWUSR));
    if(fd < 0)
        error(1, errno, "Couldn't open temp file at %s", dest);

    return fd;
}


#include <string.h>

int main(void) {
    const char *testmsg = "we do a little testing\n";

    int fd = maketmp(".");

    if(write(fd, testmsg, strlen(testmsg)) < 0)
        error(1, errno, "write broke");

    // if(linkat(fd, "", AT_FDCWD, "kys/now", AT_EMPTY_PATH) < 0)
    //     error(1, errno, "linkat broke");

    char *path = NULL;
    asprintf(&path, "/proc/self/fd/%d", fd);
    linkat(AT_FDCWD, path, AT_FDCWD, "./test", AT_SYMLINK_FOLLOW);

    // Apparently, I don't have the CAP_DAC_READ_SEARCH capibility. Thanks for the solution, linux man pages

    if(close(fd) < 0)
        error(1, errno, "close broke");

    return 0;
}