/*
** client.c -- a stream socket client demo
*/

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

#include <arpa/inet.h>

#include "protocol.h"

#define MAXDATASIZE 100 // max number of bytes we can get at once 

// get sockaddr, IPv4 or IPv6:
void *get_in_addr(struct sockaddr *sa)
{
    if (sa->sa_family == AF_INET) {
        return &(((struct sockaddr_in*)sa)->sin_addr);
    }

    return &(((struct sockaddr_in6*)sa)->sin6_addr);
}

int main(int argc, char *argv[])
{
    int sockfd, numbytesrecv, numbytessent, recvbytes;  
    // char buf[MAXDATASIZE];
    struct addrinfo hints, *servinfo, *p;
    int rv;
    char s[INET6_ADDRSTRLEN];

    if (argc != 4) {
        fprintf(stderr,"<server IP> <server port> <listener port>\n");
        exit(1);
    }

    memset(&hints, 0, sizeof hints);
    hints.ai_family = AF_INET; // only IPv4
    hints.ai_socktype = SOCK_STREAM;

    char* tcpPort = argv[2]; // port we use to connect to server's tcp stream
    char* udpPort = argv[3]; // port we use to connect to server's udp info and command

    if ((rv = getaddrinfo(argv[1], tcpPort, &hints, &servinfo)) != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
        return 1;
    }

    // loop through all the results and connect to the first we can
    for(p = servinfo; p != NULL; p = p->ai_next) {
        if ((sockfd = socket(p->ai_family, p->ai_socktype,
                p->ai_protocol)) == -1) {
            perror("client: socket");
            continue;
        }

        if (connect(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
            close(sockfd);
            perror("client: connect");
            continue;
        }

        break;
    }

    if (p == NULL) {
        fprintf(stderr, "client: failed to connect\n");
        return 2;
    }

    inet_ntop(p->ai_family, get_in_addr((struct sockaddr *)p->ai_addr),
            s, sizeof s);
    // printf("client: connecting to %s\n", s);

    freeaddrinfo(servinfo); // all done with this structure
    struct Hello hello;
    hello.commandType = 0;
    // convert updPort to an int
    int udpPortInt = atoi(udpPort);
    hello.udpPort = htons(udpPortInt);

    if ((numbytessent = send(sockfd, &hello, sizeof(struct Hello), 0)) == -1) {
        perror("send");
        exit(1);
    }

    struct Welcome msg;
    // recv the message, check for errors too
    if ((recvbytes = recv(sockfd, (char*)&msg, sizeof(struct snowcast_message), 0)) == -1) {
        perror("recv");
        exit(1);
    }
    msg.numStations = ntohs(msg.numStations);
    printf("Welcome to Snowcast! The server has %d stations.\n", msg.numStations);

    close(sockfd);

    return 0;
}