#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 <sys/time.h>

int main(int argc, char **argv)
{
    const int port = 7332;
    const char ip[512] = "192.168.1.30";
    struct sockaddr_in endpoint;
    struct dirent **namelist;
    char buff[512];
    char name_file[512];
    int sdsocket, addrlen, sdconnection, n;

    endpoint.sin_family = AF_INET;
    endpoint.sin_port = htons(port);
    endpoint.sin_addr.s_addr = inet_addr(ip);
    addrlen = sizeof(struct sockaddr_in);

    while (1)
    {
    start:
        printf("Enter the server query\n");
        bzero(buff, 512);
        scanf("%s", buff);

        if (strncmp("CLIENTOFF", buff, 9) == 0)
        {
            close(sdsocket);
            return 0;
        }
        else if (strncmp("HELP", buff, 4) == 0)
        {
            printf("COMMAND LIST:\n CLIENTOFF\n EXIT\n GET_ALL_FILES\n FTP_namefile\n");
            goto start;
        }

        if ((sdsocket = socket(AF_INET, SOCK_STREAM, 0)) < 0)
        {
            printf("socket() failed\n");
            return 1;
        }
        if (connect(sdsocket, (struct sockaddr *)&endpoint, addrlen) < 0)
        {
            printf("connect() failed\n");
            return 0;
        }
        else
            printf("CONNECTED\n");

        send(sdsocket, buff, 512, 0);

        close(sdsocket);

        if ((sdsocket = socket(AF_INET, SOCK_STREAM, 0)) < 0)
        {
            printf("socket() failed\n");
            return 1;
        }
        if (connect(sdsocket, (struct sockaddr *)&endpoint, addrlen) < 0)
        {
            printf("connect() failed\n");
            return 0;
        }

        if (strncmp("FTP", buff, 3) == 0)
        {
            ssize_t total = 0;
            strncpy(name_file, buff + 4, 509);
            printf("Name of file :%s\n", name_file);

            FILE *file = fopen(name_file, "wb");
            if (file == NULL)
            {
                printf("fopen() failed");
            }

            char addr[INET_ADDRSTRLEN];
            printf("Downloading file: %s od %s\n", name_file, inet_ntop(AF_INET, &endpoint.sin_addr.s_addr, addr, INET_ADDRSTRLEN));

            ssize_t n;
            char buff[4096] = {0};
            while ((n = recv(sdsocket, buff, 4096, 0)) > 0)
            {
                total += n;
                if (n == -1)
                {
                    printf("recv() failed");
                }

                if (fwrite(buff, sizeof(char), n, file) != n)
                {
                    printf("fwrite() failed");
                }
                memset(buff, 0, 4096);
            }

            printf("Downloading succes, numer of bytes = %ld\n", total);

            fclose(file);

            goto start;
        }

        bzero(buff, 512);
        recv(sdsocket, buff, 512, 0);
        printf("%s\n", buff);
    }

    return 0;
}