#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h> 

struct CE_Info {
    int numUtilities;
    int numParameters;
    int numObservables;
};

struct Utility {
    char name[20];
    char units[20];
    char goal[20];
   /* string name;
    string units;
    string goal;*/
    float target;
};

struct Affect {
    Utility * u; 
    //string relation;
    char relation[20];
};      

struct Parameter {
    /*string name;
    string units;*/
    char name[20];
    char units[20];
    float min;
    int numAffects; 
    Affect affection_list[10];
    float max;
    float step;
};      
        
struct Observable {
    //string name;
    char name[20];
    Affect affection_list[10];
    int numAffects;
};

// error handling
void error(char *msg)
{
    perror(msg);
    exit(0);
}

// main client socket
int main(int argc, char *argv[])
{
    int sockfd, portno, n;
    struct sockaddr_in serv_addr;
    struct hostent *server;

    char buffer[256];
    if (argc < 3) {
       fprintf(stderr,"usage %s hostname port\n", argv[0]);
       exit(0);
    }
    portno = atoi(argv[2]);
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) 
        error("ERROR opening socket");
    server = gethostbyname(argv[1]);
    if (server == NULL) {
        fprintf(stderr,"ERROR, no such host\n");
        exit(0);
    }
    bzero((char *) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr, 
         (char *)&serv_addr.sin_addr.s_addr,
         server->h_length);
    serv_addr.sin_port = htons(portno);
    if (connect(sockfd,&serv_addr,sizeof(serv_addr)) < 0) 
        error("ERROR connecting");
    
    printf("Please enter the message: ");
    bzero(buffer,256);
    fgets(buffer,255,stdin);
    n = write(sockfd,buffer,strlen(buffer));
    if (n < 0) 
         error("ERROR writing to socket");
    bzero(buffer,256);
    
    // read back xml information
    int counter;
    Utility * uList[10]
    Parameter * pList[10];
    Observable * oList[10];
    CE_Info ce_info;

    // read unitilities
    // numUtilities
    n = read(sockfd,buffer,255);
    if (n < 0) 
         error("ERROR reading from socket");
    printf("%s\n",buffer);
    ce_info->numUtilities = atoi(buffer);
    printf("number of utilities: %d\n", ce_info->numUtilities);

    return 0;
}