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#include <sys/socket.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <arpa/inet.h> 

/* Parses JSON and extracts key from it
returns 1 on success, 0 on json parse error or no key available */
extern int extractIntFromJSON(char json[], char key[], int* val);

int main(int argc, char *argv[])
{
    int sockfd = 0, n = 0;
    int recvVal = 0;
    char recvBuff[1024];
    struct sockaddr_in serv_addr; 

    memset(recvBuff, 0 ,sizeof(recvBuff));
    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
        return 1;
    } 

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

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(5000); 

    if(inet_pton(AF_INET, argv[1], &serv_addr.sin_addr)<=0)
    {
        return 1;
    } 

    if(connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
    {
       return 1;
    } 

    while ( (n = read(sockfd, recvBuff, sizeof(recvBuff)-1)) > 0)
    {
        recvBuff[n] = 0;
        if(extractIntFromJSON(recvBuff, "example_key", &recvVal)) {
            printf("Received value: %d\n", recvVal);
        }
        else {
            printf("Invalid message received\n")
        }   
    } 

    if(n < 0)
    {
        printf("\n Read error \n");
    } 

    return 0;
}