/*
 * Copyright (c) 2014 Wireless Communications and Networking Group (WCNG),
 * University of Rochester, Rochester, NY, USA.
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Author: Cristiano Tapparello <cristiano.tapparello@rochester.edu>
 */

#ifndef ENERGY_HARVESTER_H
#define ENERGY_HARVESTER_H

#include "ns3/object.h"
#include "ns3/ptr.h"
#include "ns3/type-id.h"

#include <iostream>

namespace ns3
{

class Node;

namespace energy
{

class EnergySource;

/**
 * @ingroup energy
 *
 * @brief Energy harvester base class.
 */

class EnergyHarvester : public Object
{
  public:
    /**
     * @brief Get the type ID.
     * @return The object TypeId.
     */
    static TypeId GetTypeId();

    EnergyHarvester();

    ~EnergyHarvester() override;

    /**
     * @brief Sets pointer to node containing this EnergyHarvester.
     *
     * @param node Pointer to node containing this EnergyHarvester.
     */
    void SetNode(Ptr<Node> node);

    /**
     * @returns Pointer to node containing this EnergyHarvester.
     *
     * When a subclass needs to get access to the underlying node base class to
     * print the nodeId for example, it can invoke this method.
     */
    Ptr<Node> GetNode() const;

    /**
     * @param source Pointer to energy source to which this EnergyHarvester is
     * installed.
     *
     * This function sets the pointer to the energy source connected to the energy
     * harvester.
     */
    void SetEnergySource(Ptr<EnergySource> source);

    /**
     * @returns Pointer to energy source connected to the harvester.
     *
     * When a subclass needs to get access to the connected energy source,
     * it can invoke this method.
     */
    Ptr<EnergySource> GetEnergySource() const;

    /**
     * @returns Amount of power currently provided by the harvester.
     *
     * This method is called by the energy source connected to the harvester in order
     * to determine the amount of energy that the harvester provided since last update.
     */
    double GetPower() const;

  private:
    /**
     *
     * Defined in ns3::Object
     */
    void DoDispose() override;

    /**
     * This method is called by the GetPower method and it needs to be implemented by the
     * subclasses of the energy harvester. It returns the actual amount of power that is
     * currently provided by the energy harvester.
     *
     * This method should be used to connect the logic behind the particular implementation
     * of the energy harvester with the energy source.
     *
     * @returns Amount of power currently provided by the harvester.
     */
    virtual double DoGetPower() const;

  private:
    /**
     * Pointer to node containing this EnergyHarvester. Used by helper class to make
     * sure energy harvesters are installed onto the corresponding node.
     */
    Ptr<Node> m_node;

    /**
     * Pointer to the Energy Source to which this EnergyHarvester is connected. Used
     * by helper class to make sure energy harvesters are installed onto the
     * corresponding energy source.
     */
    Ptr<EnergySource> m_energySource;

  protected:
};

} // namespace energy
} // namespace ns3

#endif /* defined(ENERGY_HARVESTER_H) */
