#include "stdafx.h"

#include <stdio.h>
#include <winsock.h>
#include <conio.h>

#pragma comment(lib,"ws2_32.lib") //Winsock Library

#define SERVER "192.168.0.13"  //ip address of udp server
#define BUFLEN 512  //Max length of buffer
#define PORT 7505   //The port on which to listen for incoming data

struct temperature
{
    short year;
    char month;
    char day;
    double value;
};

struct pressure
{
    short year;
    char month;
    char day;
    float value;
};

int main(void)
{
    struct temperature* T;
    struct pressure* P;
    int n;

    struct sockaddr_in si_other;
    int s, slen = sizeof(si_other);
    char buf[BUFLEN];
    char message[BUFLEN];
    WSADATA wsa;

    //Initialise winsock
    printf("\nInitialising Winsock...");
    if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
    {
        printf("Failed. Error Code : %d", WSAGetLastError());
        exit(EXIT_FAILURE);
    }
    printf("Initialised.\n");

    //create socket
    if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == SOCKET_ERROR)
    {
        printf("socket() failed with error code : %d", WSAGetLastError());
        exit(EXIT_FAILURE);
    }

    //setup address structure
    memset((char *)&si_other, 0, sizeof(si_other));
    si_other.sin_family = AF_INET;
    si_other.sin_port = htons(PORT);
    si_other.sin_addr.S_un.S_addr = inet_addr(SERVER);

    //start communication
    while (1)
    {
        printf("Enter message : ");
        scanf("%s",message);

        if (strcmp(message, "exit") == 0)
            break;

        //send the message
        if (sendto(s, message, strlen(message), 0, (struct sockaddr *) &si_other, slen) == SOCKET_ERROR)
        {
            printf("sendto() failed with error code : %d", WSAGetLastError());
            getch();
            exit(EXIT_FAILURE);
        }

        //receive a reply and print it
        //clear the buffer by filling null, it might have previously received data
        memset(buf, '\0', BUFLEN);
        //try to receive some data, this is a blocking call
        if (recvfrom(s, buf, BUFLEN, 0, (struct sockaddr *) &si_other, &slen) == SOCKET_ERROR)
        {
            printf("recvfrom() failed with error code : %d", WSAGetLastError());
            getch();
            exit(EXIT_FAILURE);
        }

        if ((short)buf[0] == -1)
        {
            printf("Nieprawidlowe polecenie");
        }

        if (buf[0] == 0x17)
        {
            n = (int)buf[1];
            printf("Temperatura\n");
            for (int i = 0; i < n; i++)
            {
                T = (temperature*)buf[5 + i * sizeof(temperature)];
                printf("%d-%d-%d\t%lf\n", T->year, T->month, T->day, T->value);
            }
        }

        if (buf[0] == 0x18)
        {
            n = (int)buf[1];
            printf("Cisnienie");
            for (int i = 0; i < n; i++)
            {
                P = (pressure*)buf[5 + i * sizeof(pressure)];
                printf("%d-%d-%d\t%f\n", P->year, P->month, P->day, P->value);
            }
        }



    }

    closesocket(s);
    WSACleanup();

    return 0;
}