/* Virginia Tech Cognitive Radio Open Source Systems
 * Virginia Tech, 2009
 *
 * TODO LICENSE INFORMATION GOES HERE
 */

/* TODO DESCRIPTION OF FILE.
 *
 * This file is a temporary demo of a policy engine using some of our socket
 * communication functions. This is *not* an actual implementation of our
 * defined PolicyEngine class.
 */


#include <cstdlib>
#include <cstring>
#include <stdint.h>

#include "vtcross/common.h"
#include "vtcross/containers.h"
#include "vtcross/socket_comm.h"


#define CR_PORT 30002


int32_t 
ValidateTransmissionParameters(struct Parameter pList[], \
        struct CE_Info *ce_info, int decision_array[])
{
    LOG("Policy Engine:: Policies Validated.\n");
    for (size_t i = 0; i < ce_info->numParameters; i++)
        decision_array[i] = 1;

    return 1;
}


int32_t 
RegisterPE(int32_t socketFD)
{
    SendMessage(socketFD, "p_register");
    LOG("Policy Engine:: Registration message sent.\n");
    return 1;
}


int32_t 
SendCEDecision(int32_t socketFD, struct Parameter pList[], \
        struct CE_Info *ce_info, int32_t decision_array[])
{
    char var[50];
 
    for (size_t i = 0; i < ce_info->numParameters; i++) {
        sprintf(var, "%i", decision_array[i]);
        SendMessage(socketFD, var);
    }
    
    return 1;
}


int32_t 
ParsePolicies() 
{

    LOG("Policy Engine:: Policies parsed.\n");
    return 1;
}


int32_t 
main(int32_t argc, char *argv[])
{
    if(argc < 3)
       ERROR(1, "Usage: %s hostname port\n", argv[0]);

    int32_t decision_array[10];
    struct Parameter pList[10];
    struct CE_Info ce_info;
    int32_t ret = 0;
    
    int32_t socketFD = ClientSocket(argv[1], argv[2]);

    LOG("Policy Engine:: Parsing local policies.\n");
    ParsePolicies();

    RegisterPE(socketFD);

    while(1) {
        LOG("Policy Engine:: Waiting for Policy Check Request.\n");
        ret = GetRequest(socketFD, pList, &ce_info);
       
        if(ret == 1) {
            LOG("Policy Engine:: Validating Transmission Parameters.\n");
            ValidateTransmissionParameters(pList, &ce_info, decision_array);    
   
            LOG("Policy Engine:: Sending Policy decision to Server.\n");
            SendCEDecision(socketFD, pList, &ce_info, decision_array);
        }
    }
    
    return 0;
}