/*
 Copyright 2009 Virginia Polytechnic Institute and State University  

 Licensed under the Apache License, Version 2.0 (the "License"); 
 you may not use this file except in compliance with the License. 
 You may obtain a copy of the License at 
 
 http://www.apache.org/licenses/LICENSE-2.0 

 Unless required by applicable law or agreed to in writing, software 
 distributed under the License is distributed on an "AS IS" BASIS, 
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 See the License for the specific language governing permissions and 
 limitations under the License. 
*/

/* This header exports the declaration for the Cognitive Engine component type.
 */

#ifndef COGNITIVE_ENGINE_H
#define COGNITIVE_ENGINE_H


#include "components.h"


/* Cognitive Engine class declaration.  All public functions are inherited from
 * parent classes.
 */
class CognitiveEngine : public Engine
{
    public:
        CognitiveEngine();
        ~CognitiveEngine();

        /* Overloaded constructor that creates a cognitive engine object and
         * connects it to either the shell or an SML, depening on the SML bool.
         */
        CognitiveEngine(const char* serverName, const char* serverPort, \
                const bool SML);
        
        void SendComponentType();
        void ConnectToRemoteComponent(const char* serverName, \
                const char* serverPort, const bool SML);
        void WaitForSignal();
        void Shutdown();
        void Reset();
        void RegisterComponent();
        void DeregisterComponent();

        void RegisterServices();
        void DeregisterServices();

    private:
        /* Receive the transmitted radio configuration from the radio itself
         * (the CE will not always be local to the radio).
         */
        void ReceiveRadioConfiguration();

        /* Receive an 'experience' report from the radio.
         */
        void ReceiveExperience();

        /* Find the most optimal set of transmission parameters given certain
         * observables and possibly a service if the SML component is present
         * and active.
         */
        Parameter *GetSolution(Observable *observables, Parameter *currentParameters);
        Parameter *GetSolution(Observable *observables, Parameter *currentParameters, \
                std::string service);

        /* Receive a feedback from the radio regarding the performance of a
         * certain set of parameters, possibly associated with a service.
         *
         * Feedback is a single set of performance statistics that is achieved
         * corresponding to a specific set of transmission parameters.  Feedback
         * helps a Cognitive Engine make better future decisions based upon 
         * more accurate performance statistics. 
         */
        void ReceiveFeedback(Observable *observables,\
                Parameter *parameters);
        void ReceiveFeedback(Observable *observables, \
                Parameter *parameters, std::string service);


        /* BuildCognitiveEngine performs the CE implementation specific work
         * that defines the internals of a CE.  For example, a CBR CE engine
         * would build the case-base reasoner or create the database, a neural
         * network based CE may perform the initial training, a GA based CE
         * may build the chromosome structure.
         */
        void BuildCognitiveEngine();

        /* The SML_present bool reflects whether or not the remote component
         * this object is connected to is an SML.  If it isn't, then it must be
         * a shell.  The socketFD stores the socket file descriptor for this
         * connection.
         */
        bool SML_present;
        int32_t commandSocketFD;
        
        // TODO Need a description for these fields.  Are these radio utilites,
        // parameters, and observables global to the whole system?
        Utility *uList;
        Parameter *pList;
        Observable *oList;
        struct Radio_Info *radioInfo;
};

#endif