#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>

#include <stdio.h>
#include <stdint.h>

#pragma comment(lib, "ws2_32.lib")


/*
Address info

- ai_flag: address info flag
- ai_family: addres info family AF_INET (ipv4) or AF_INET6 (ipv6)
- ai_socktype: socket type SOCK_STREAM or SOCK_DGRAM
- ai_protocol: use 0 for any
- ai_addrlen: size of the ai_addr (below)
- ai_addr: pointer sockaddr struct
- ai_canonname: canonical hostname
- ai_next: linked list to next node
*/

/*typedef struct addrinfo {
    int ai_flag; // address info flags
    int ai_family; // address info famitly ipv4/6
    int ai_socktype;
    int ai_protocol;
    size_t ai_addrlen;
    sockaddr *ai_addr;
    char *ai_canonname;

    addrinfo *ai_next;
} addrinfo;
*/

/*
Socket address info

- sa_family: AF_XX (e.g AF_INET)
- sa_data: 14 bytes of protocol address, the destination address as well as the port number
*/
/*typedef struct sockaddr {
    unsigned short sa_family;
    char *sa_data[14];

} sockaddr;
*/

/*
Socket Adress Internet (ipv4)

This struct is used to replace sockaddr in instances where family = AF_INET

- sin_family: AF_INET (ALWAYS)
- sin_port: port 
- sin_addr: address struct
- sin_zero: padding to match sockaddr
*/
/*typedef sockaddr_in {
    short int sin_family;
    unsigned short int sin_port;
    in_addr sin_addr;
    unsigned char sin_zero[8];
} sockaddr_in;

typedef struct in_addr {
    uint32_t s_addr; 
} in_addr;
*/

int main() 
{

    {
        WSADATA wsaData;

        if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
            fprintf(stderr, "WSAStartup failed.\n");
            exit(1);
        }

        if (LOBYTE(wsaData.wVersion) != 2 ||
            HIBYTE(wsaData.wVersion) != 2)
        {
            fprintf(stderr,"Versiion 2.2 of Winsock is not available.\n");
            WSACleanup();
            exit(2); 
        }
    }


    // char ip4[INET_ADDRSTRLEN];
    // struct sockaddr_in sa; // ipv4 ip address

    // inet_pton(AF_INET, "10.12.110.57", &(sa.sin_addr));
    // inet_ntop(AF_INET, &(sa.sin_addr), ip4, INET_ADDRSTRLEN);

    // printf("the ipv4 address is: %s\n", ip4);

    // printf("hellow world!\n");

    int status;

    struct addrinfo hints;
    struct addrinfo *servinfo;

    memset(&hints, 0, sizeof(hints));

    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags = AI_PASSIVE;

    status = getaddrinfo(NULL, "3490", &hints, &servinfo);
    
    if (status != 0) {
        fprintf(stderr, "getaddrinfo error: %s\n", gai_strerror(status));
        exit(1);
    }

    freeaddrinfo(servinfo);

    return(0);
}