#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <dirent.h>

int main(int argc, char **argv)
{
    const int port = 7332;
    struct sockaddr_in myaddr, endpoint;
    int sdsocket, sdconnection, addrlen, sdconnection2, n;
    char odbior[512];
    struct dirent **namelist;
    char name_file[512];
    char names_files[512];

    sdsocket = socket(AF_INET, SOCK_STREAM, 0);
    addrlen = sizeof(struct sockaddr_in);

    myaddr.sin_family = AF_INET;
    myaddr.sin_port = htons(port);
    myaddr.sin_addr.s_addr = htonl(INADDR_ANY);

    if (bind(sdsocket, (struct sockaddr *)&myaddr, addrlen) < 0)
    {
        printf("bind() nie powiodl sie (failed)\n");
        return 1;
    }

    if (listen(sdsocket, 10) < 0)
    {
        printf("listen() nie powiodl sie (failed)\n");
        return 1;
    }

    while ((sdconnection =
                accept(sdsocket,
                       (struct sockaddr *)&endpoint,
                       &addrlen)) >= 0)
    {
        printf("Connected\n");
        send(sdconnection, "CONNECT", 7, 0);

        close(sdconnection);
        break;
    }

    while (1)
    {

        while ((sdconnection =
                    accept(sdsocket,
                           (struct sockaddr *)&endpoint,
                           &addrlen)) >= 0)
        {
            bzero(odbior, 512);
            recv(sdconnection, odbior, 512, 0);

            close(sdconnection);

            if (strncmp("GET_ALL_FILES", odbior, 13) == 0)
            {
                printf("Sending list of names files\n");
                n = scandir(".", &namelist, NULL, alphasort);
                if (n == -1)
                {
                    perror("scandir");
                    exit(EXIT_FAILURE);
                }

                while (n--)
                {
                    sprintf(name_file, "%s\n", namelist[n]->d_name);

                    strcat(names_files, name_file);

                    free(namelist[n]);
                }
                free(namelist);

                while ((sdconnection2 =
                            accept(sdsocket,
                                   (struct sockaddr *)&endpoint,
                                   &addrlen)) >= 0)
                {

                    send(sdconnection2, names_files, 512, 0);

                    close(sdconnection2);
                    break;
                }
            }
            else
            {
                printf("Wrong query\n");
                while ((sdconnection2 =
                            accept(sdsocket,
                                   (struct sockaddr *)&endpoint,
                                   &addrlen)) >= 0)
                {
                    
                    send(sdconnection2, "Wrong query", 512, 0);

                    close(sdconnection2);
                    break;
                }
            }
        }
    }
    close(sdsocket);
    return 0;
}