/*
 * Copyright (c) 2015 Danilo Abrignani
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Author: Danilo Abrignani <danilo.abrignani@unibo.it>
 */

#ifndef COMPONENT_CARRIER_H
#define COMPONENT_CARRIER_H

#include "ns3/object.h"

namespace ns3
{

/**
 * @ingroup lte
 *
 * ComponentCarrier Object, it defines a single Carrier
 * This is the parent class for both ComponentCarrierBaseStation
 * and ComponentCarrierUe.
 * This class contains the main physical configuration
 * parameters for a carrier. Does not contain pointers to
 * the MAC/PHY objects of the carrier.
 */
class ComponentCarrier : public Object
{
  public:
    /**
     * @brief Get the type ID.
     * @return the object TypeId
     */
    static TypeId GetTypeId();

    ComponentCarrier();

    ~ComponentCarrier() override;
    void DoDispose() override;

    /**
     * @return the uplink bandwidth in RBs
     */
    uint16_t GetUlBandwidth() const;

    /**
     * @param bw the uplink bandwidth in RBs
     */
    virtual void SetUlBandwidth(uint16_t bw);

    /**
     * @return the downlink bandwidth in RBs
     */
    uint16_t GetDlBandwidth() const;

    /**
     * @param bw the downlink bandwidth in RBs
     */
    virtual void SetDlBandwidth(uint16_t bw);

    /**
     * @return the downlink carrier frequency (EARFCN)
     */
    uint32_t GetDlEarfcn() const;

    /**
     * @param earfcn the downlink carrier frequency (EARFCN)
     */
    void SetDlEarfcn(uint32_t earfcn);

    /**
     * @return the uplink carrier frequency (EARFCN)
     */
    uint32_t GetUlEarfcn() const;

    /**
     * @param earfcn the uplink carrier frequency (EARFCN)
     */
    void SetUlEarfcn(uint32_t earfcn);

    /**
     * @brief Returns the CSG ID of the eNodeB.
     * @return the Closed Subscriber Group identity
     * \sa LteEnbNetDevice::SetCsgId
     */
    uint32_t GetCsgId() const;

    /**
     * @brief Associate the eNodeB device with a particular CSG.
     * @param csgId the intended Closed Subscriber Group identity
     *
     * CSG identity is a number identifying a Closed Subscriber Group which the
     * cell belongs to. eNodeB is associated with a single CSG identity.
     *
     * The same CSG identity can also be associated to several UEs, which is
     * equivalent as enlisting these UEs as the members of this particular CSG.
     *
     * \sa LteEnbNetDevice::SetCsgIndication
     */
    void SetCsgId(uint32_t csgId);

    /**
     * @brief Returns the CSG indication flag of the eNodeB.
     * @return the CSG indication flag
     * \sa LteEnbNetDevice::SetCsgIndication
     */
    bool GetCsgIndication() const;

    /**
     * @brief Enable or disable the CSG indication flag.
     * @param csgIndication if TRUE, only CSG members are allowed to access this
     *                      cell
     *
     * When the CSG indication field is set to TRUE, only UEs which are members of
     * the CSG (i.e. same CSG ID) can gain access to the eNodeB, therefore
     * enforcing closed access mode. Otherwise, the eNodeB operates as a non-CSG
     * cell and implements open access mode.
     *
     * @note This restriction only applies to initial cell selection and
     *       EPC-enabled simulation.
     *
     * \sa LteEnbNetDevice::SetCsgIndication
     */
    void SetCsgIndication(bool csgIndication);

    /**
     * @brief Set as primary carrier
     * @param primaryCarrier true to set as primary carrier
     */
    void SetAsPrimary(bool primaryCarrier);

    /**
     * @brief Checks if the carrier is the primary carrier
     * @returns true if the carrier is primary
     */
    bool IsPrimary() const;

  protected:
    uint32_t m_csgId{0};         ///< CSG ID
    bool m_csgIndication{false}; ///< CSG indication

    bool m_primaryCarrier{false}; ///< whether the carrier is primary

    uint16_t m_dlBandwidth{0}; ///< downlink bandwidth in RBs */
    uint16_t m_ulBandwidth{0}; ///< uplink bandwidth in RBs */

    uint32_t m_dlEarfcn{0}; ///< downlink carrier frequency */
    uint32_t m_ulEarfcn{0}; ///< uplink carrier frequency */
};

/**
 * @ingroup lte
 *
 * Defines a Base station, that is a ComponentCarrier but with a cell Id.
 *
 */
class ComponentCarrierBaseStation : public ComponentCarrier
{
  public:
    /**
     * @brief Get the type ID.
     * @return the object TypeId
     */
    static TypeId GetTypeId();

    /**
     * @brief Constructor
     */
    ComponentCarrierBaseStation();

    /**
     * @brief ~ComponentCarrierBaseStation
     */
    ~ComponentCarrierBaseStation() override;

    /**
     * Get cell identifier
     * @return cell identifier
     */
    uint16_t GetCellId() const;

    /**
     * Set physical cell identifier
     * @param cellId cell identifier
     */
    void SetCellId(uint16_t cellId);

  protected:
    uint16_t m_cellId{0}; ///< Cell identifier
};

} // namespace ns3

#endif /* COMPONENT_CARRIER_H */
