/*
 * Copyright (c) 2008 INRIA
 * Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr> (original node-container.h)
 *         Nicola Baldo (wrote building-container.h based on node-container.h)
 */
#ifndef BUILDING_CONTAINER_H
#define BUILDING_CONTAINER_H

#include "ns3/building.h"

#include <stdint.h>
#include <vector>

namespace ns3
{

/**
 * @ingroup buildings
 *
 * @brief keep track of a set of building pointers.
 *
 * Some ns-3 helpers operate on more than one building at a time.  For example
 * a PositionAllocator may want to position nodes on a set of buildings.
 * The helper methods will then usually take a BuildingContainer as a
 * parameter.  BuildingContainers hold the multiple Ptr<Building> which are used
 * to refer to the buildings.
 */
class BuildingContainer
{
  public:
    /// Const iterator
    typedef std::vector<Ptr<Building>>::const_iterator Iterator;

    /**
     * Create an empty BuildingContainer.
     */
    BuildingContainer();

    /**
     * Create a BuildingContainer with exactly one building which has been previously
     * instantiated.  The single Building is specified by a smart pointer.
     *
     * @param building The Ptr<Building> to add to the container.
     */
    BuildingContainer(Ptr<Building> building);

    /**
     * Create a BuildingContainer with exactly one building which has been previously
     * instantiated and assigned a name using the Object Name Service.  This
     * Building is then specified by its assigned name.
     *
     * @param buildingName The name of the Building Object to add to the container.
     */
    BuildingContainer(std::string buildingName);

    /**
     * @brief Get an iterator which refers to the first Building in the
     * container.
     *
     * Buildings can be retrieved from the container in two ways.  First,
     * directly by an index into the container, and second, using an iterator.
     * This method is used in the iterator method and is typically used in a
     * for-loop to run through the Buildings
     *
     * @code
     *   for (auto i = container.Begin(); i != container.End(); ++i)
     *   {
     *       (*i)->method(); // some Building method
     *   }
     * @endcode
     *
     * @returns an iterator which refers to the first Building in the container.
     */
    Iterator Begin() const;

    /**
     * @brief Get an iterator which indicates past-the-last Building in the
     * container.
     *
     * Buildings can be retrieved from the container in two ways.  First,
     * directly by an index into the container, and second, using an iterator.
     * This method is used in the iterator method and is typically used in a
     * for-loop to run through the Buildings
     *
     * @code
     *   for (auto i = container.Begin(); i != container.End(); ++i)
     *   {
     *       (*i)->method(); // some Building method
     *   }
     * @endcode
     *
     * @returns an iterator which indicates an ending condition for a loop.
     */
    Iterator End() const;

    /**
     * @brief Get the number of Ptr<Building> stored in this container.
     *
     * Buildings can be retrieved from the container in two ways.  First,
     * directly by an index into the container, and second, using an iterator.
     * This method is used in the direct method and is typically used to
     * define an ending condition in a for-loop that runs through the stored
     * Buildings
     *
     * @code
     *   uint32_t nBuildings = container.GetN ();
     *   for (uint32_t i = 0 i < nBuildings; ++i)
     *     {
     *       Ptr<Building> p = container.Get (i)
     *       i->method ();  // some Building method
     *     }
     * @endcode
     *
     * @returns the number of Ptr<Building> stored in this container.
     */
    uint32_t GetN() const;

    /**
     * @brief Get the Ptr<Building> stored in this container at a given
     * index.
     *
     * Buildings can be retrieved from the container in two ways.  First,
     * directly by an index into the container, and second, using an iterator.
     * This method is used in the direct method and is used to retrieve the
     * indexed Ptr<Application>.
     *
     * @code
     *   uint32_t nBuildings = container.GetN ();
     *   for (uint32_t i = 0 i < nBuildings; ++i)
     *     {
     *       Ptr<Building> p = container.Get (i)
     *       i->method ();  // some Building method
     *     }
     * @endcode
     *
     * @param i the index of the requested building pointer.
     * @returns the requested building pointer.
     */
    Ptr<Building> Get(uint32_t i) const;

    /**
     * @brief Create n buildings and append pointers to them to the end of this
     * BuildingContainer.
     *
     * Buildings are at the heart of any ns-3 simulation.  One of the first tasks that
     * any simulation needs to do is to create a number of buildings.  This method
     * automates that task.
     *
     * @param n The number of Buildings to create
     */
    void Create(uint32_t n);

    /**
     * @brief Append the contents of another BuildingContainer to the end of
     * this container.
     *
     * @param other The BuildingContainer to append.
     */
    void Add(BuildingContainer other);

    /**
     * @brief Append a single Ptr<Building> to this container.
     *
     * @param building The Ptr<Building> to append.
     */
    void Add(Ptr<Building> building);

    /**
     * @brief Append to this container the single Ptr<Building> referred to
     * via its object name service registered name.
     *
     * @param buildingName The name of the Building Object to add to the container.
     */
    void Add(std::string buildingName);

    /**
     * @brief Create a BuildingContainer that contains a list of _all_ buildings
     * stored in the ns3::BuildingList.
     *
     * Whenever a Building is created, a Ptr<Building> is added to a global list of all
     * buildings in the system.  It is sometimes useful to be able to get to all
     * buildings in one place.  This method creates a BuildingContainer that is
     * initialized to contain all of the simulation buildings,
     *
     * @returns a BuildingContainer which contains a list of all Buildings.
     */
    static BuildingContainer GetGlobal();

  private:
    std::vector<Ptr<Building>> m_buildings; //!< Building container
};

} // namespace ns3

#endif /* BUILDING_CONTAINER_H */
