typedef uint8_t token[SGX_AESGCM_MAC_SIZE];
typedef uint8_t aes_key[SGX_AESGCM_KEY_SIZE];

// #define VERBOSE_CLIENT

/*

  Client -> Ingestion Server (C->I) communication protocols:

  1) Authentication
     Format: Client sim_id, Epoch number, Authentication token

  2) Messages
     Format: IV, AESGCM([CM_1], [CM_2], ..., [CM_k]), TAG
      - each CM = Client Message for private channel has the format :
        4-byte Sender ID, 4-byte Recipient ID, 16-byte Token,
        <Upto msg_size - 24> - bytes of message data
        where the Sender ID and Recipient ID are the TEEMS client id
        (and not sim_id)
*/


/*
    Structure for capture each individual simulated client's state

*/
class Client
{

private:
    // Clients' have a simulator ID sim_id used for:
    //  (i) the simulator to divvy up clients across threads
    // (ii) the simulator and ingestion servers to align simulated clients
    //      and their pre-established shared-secrets
    clientid_t sim_id;

    // The actual client id used by TEEMS is id.
    // Format: the first DEST_STORAGE_NODE_BITS bits store the storage node
    // number and the userid at that storage node in the last DEST_UID_BITS
    clientid_t id;
    aes_key key;
    unsigned char iv[SGX_AESGCM_IV_SIZE] = {0};

    boost::asio::ip::tcp::socket *ingestion_sock = NULL;

    void generateAuthenticationMessage();

    void generateMessageBundle(uint8_t priv_out, uint32_t msg_size,
        unsigned char *pt_msgbundle);

    bool encryptMessageBundle(uint32_t bundle_size, unsigned char *pt_msgbundle,
        unsigned char* enc_msgbundle);

public:

    Client () {
        memset(key, 0, SGX_AESGCM_KEY_SIZE);
        memset(iv, 0, SGX_AESGCM_IV_SIZE);
    }

    void initClient(clientid_t cid, aes_key ckey, uint16_t num_storage_nodes,
        std::vector<uint16_t> &storage_map) {
        sim_id = cid;
        uint16_t stg_no = cid % num_storage_nodes;
        uint16_t stg_id = storage_map[stg_no];
        id = stg_id << DEST_UID_BITS;
        id += (cid/num_storage_nodes);
        //printf("Client sim_id = %d, stg_id = %d, cid = %d\n", sim_id, stg_id, id);
        memcpy(key, ckey, SGX_AESGCM_KEY_SIZE);
    }

    bool socketReady(){
        return(ingestion_sock!=NULL);
    }

    clientid_t getid(){
        return id;
    }

    unsigned char* getKey(){
        return ((unsigned char*) key);
    }

    void initializeSocket(boost::asio::io_context &ioc, NodeConfig &ing_server);

    int sendAuthMessage(unsigned long epoch_no);

    void sendMessageBundle(uint16_t priv_out, uint16_t msg_size,
         unsigned char *pt_msgbundle, unsigned char *enc_msgbundle);

};