#include <stdio.h>
#include <arpa/inet.h>
#include <unistd.h>

int main(int argc, char *argv[]) {

    int buff_size;
    int socket_desc, new_socket, c, data_size, i;
    struct sockaddr_in server, client;
    int read_size;
    char client_message[20], received_data[20], operation_sign = 0, received_data_size = 0;
    char *tmp_buff;
    char result = 0;
    socket_desc = socket(AF_INET, SOCK_STREAM, 0);
    if (socket_desc == -1) {
        perror("Could not create socket");
    }

    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;
    server.sin_port = htons(8888);

    if (bind(socket_desc, (struct sockaddr *) &server, sizeof(server)) < 0) {
        perror("Problem dolaczenia gniazda");
    }
    puts("Dolaczono gniazdo strumieniowe");

    listen(socket_desc, 3);

    puts("SERWER TCP: Czekam na polaczenie...");
    c = sizeof(struct sockaddr_in);
    while (1) {

        new_socket = accept(socket_desc, (struct sockaddr *) &client, (socklen_t *) &c);
        if (new_socket < 0) {
            perror("Problem z akceptacja poloczenia");
        }
        puts("Polaczenie zaakceptowane");

        while ((read_size = (int) recv(new_socket, client_message, 3000, 0)) > 0) {
            puts("SERWER: Dane odebrano");
            operation_sign = client_message[0];
            for (i = 1; i < 20; i++) {
                if (client_message[i] == 0) {
                    //dane + symbol obliczenia
                    received_data_size = (char) (i);
                    break;
                }
            }
            // char received_data[buff_size];
            printf("received_data_size => %d\n", received_data_size);
            for (i = 0; i < received_data_size; i++) {
                received_data[i] = client_message[i + 1];
                printf("received_data[%d] %d\n", i, client_message[i]);
            }
            for (i = 0; i < received_data_size; i++) {
                client_message[i] = 0;
            }
            received_data_size = 0;

            for (i = 0; i < received_data_size; i++) {
                result += received_data[i];
            }
            tmp_buff[0] = result;

            puts("tmp_buff[0] = result;");


    close(new_socket);
    return 0;
}