#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <stdbool.h>
#include <sys/stat.h>

enum class
{
    CLASS_OWNER,
    CLASS_GROUP,
    CLASS_OTHER
};
enum permission
{
    PERMISSION_READ,
    PERMISSION_WRITE,
    PERMISSION_EXECUTE
};

const mode_t EMPTY_MODE = 0;
mode_t perm(enum class c, enum permission p) { return 1 << ((2 - p) + (2 - c) * 3); }
mode_t mode_add(mode_t mode, enum class c, enum permission p) { return mode | perm(c, p); }
mode_t mode_rm(mode_t mode, enum class c, enum permission p) { return mode & ~perm(c, p); }

void afiseazaDescriere();

int cmd;

int setMasc[13];

int main(int argc, char **argv)
{
    if (argc < 1)
    {
        printf("Introdu numele fisierului/fisierelor.\n");
        exit(1);
    }

    while (1)
    {
        afiseazaDescriere();
        scanf("%i", &cmd);

        if (cmd == 0)
            break;
        else
        {
            int cmdSet;
            printf("Introduceti 1(true) sau -1(false) in functie de preferinta dumneavoastra\n");

            scanf("%i", &cmdSet);

            if (cmdSet != 1 && cmdSet != -1)
                printf("Input invalid\n");
            else
                setMasc[cmd] = cmdSet;
        }
    }

    for (int i = 1; i < argc; i++)
    {
        struct stat st;

        if (stat(argv[i], &st) != 0)
        {
            printf("Eroare la stat pentru %s .\n", argv[i]);
            continue;
        }

        if (setMasc[1] == 1)
            st.st_mode = mode_add(st.st_mode, CLASS_OWNER, PERMISSION_READ);
        else if (setMasc[1] == -1)
            st.st_mode = mode_rm(st.st_mode, CLASS_OWNER, PERMISSION_READ);

        if (setMasc[2] == 1)
            st.st_mode = mode_add(st.st_mode, CLASS_OWNER, PERMISSION_WRITE);
        else if (setMasc[2] == -1)
            st.st_mode = mode_rm(st.st_mode, CLASS_OWNER, PERMISSION_WRITE);

        if (setMasc[3] == 1)
            st.st_mode = mode_add(st.st_mode, CLASS_OWNER, PERMISSION_EXECUTE);
        else if (setMasc[3] == -1)
            st.st_mode = mode_rm(st.st_mode, CLASS_OWNER, PERMISSION_EXECUTE);

        if (setMasc[4] == 1)
            st.st_mode = mode_add(st.st_mode, CLASS_GROUP, PERMISSION_READ);
        else if (setMasc[4] == -1)
            st.st_mode = mode_rm(st.st_mode, CLASS_GROUP, PERMISSION_READ);

        if (setMasc[5] == 1)
            st.st_mode = mode_add(st.st_mode, CLASS_GROUP, PERMISSION_WRITE);
        else if (setMasc[5] == -1)
            st.st_mode = mode_rm(st.st_mode, CLASS_GROUP, PERMISSION_WRITE);

        if (setMasc[6] == 1)
            st.st_mode = mode_add(st.st_mode, CLASS_GROUP, PERMISSION_EXECUTE);
        else if (setMasc[6] == -1)
            st.st_mode = mode_rm(st.st_mode, CLASS_GROUP, PERMISSION_EXECUTE);

        if (setMasc[7] == 1)
            st.st_mode = mode_add(st.st_mode, CLASS_OTHER, PERMISSION_READ);
        else if (setMasc[7] == -1)
            st.st_mode = mode_rm(st.st_mode, CLASS_OTHER, PERMISSION_READ);

        if (setMasc[8] == 1)
            st.st_mode = mode_add(st.st_mode, CLASS_OTHER, PERMISSION_WRITE);
        else if (setMasc[8] == -1)
            st.st_mode = mode_rm(st.st_mode, CLASS_OTHER, PERMISSION_WRITE);

        if (setMasc[9] == 1)
            st.st_mode = mode_add(st.st_mode, CLASS_OTHER, PERMISSION_EXECUTE);
        else if (setMasc[9] == -1)
            st.st_mode = mode_rm(st.st_mode, CLASS_OTHER, PERMISSION_EXECUTE);

        chmod(argv[i],st.st_mode);
    }
    printf("Done!");
}

void afiseazaDescriere()
{
    printf("Seteaza permisiune pentru fisier/fisiere\n");
    printf("Selecteaza o optiune dintre cele de mai jos:\n");

    printf("0.Exit\n");
    printf("1.Read by owner\n");
    printf("2.Write by owner\n");
    printf("3.Execute/search by owner\n");
    printf("4.Read by group\n");
    printf("5.Write by group\n");
    printf("6.Execute/search by group\n");
    printf("7.Read by others\n");
    printf("8.Write by others\n");
    printf("9.Execute/search by others\n");
}