/*
 * Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Nicola Baldo  <nbaldo@cttc.es>
 * Author: Marco Miozzo <mmiozzo@cttc.es>
 */

#ifndef LTE_UE_MAC_ENTITY_H
#define LTE_UE_MAC_ENTITY_H

#include <ns3/event-id.h>
#include <ns3/lte-mac-sap.h>
#include <ns3/lte-ue-cmac-sap.h>
#include <ns3/lte-ue-phy-sap.h>
#include <ns3/nstime.h>
#include <ns3/packet-burst.h>
#include <ns3/packet.h>
#include <ns3/traced-callback.h>

#include <map>
#include <vector>

namespace ns3
{

class UniformRandomVariable;

class LteUeMac : public Object
{
    /// allow UeMemberLteUeCmacSapProvider class friend access
    friend class UeMemberLteUeCmacSapProvider;
    /// allow UeMemberLteMacSapProvider class friend access
    friend class UeMemberLteMacSapProvider;
    /// allow UeMemberLteUePhySapUser class friend access
    friend class UeMemberLteUePhySapUser;

  public:
    /**
     * \brief Get the type ID.
     * \return the object TypeId
     */
    static TypeId GetTypeId();

    LteUeMac();
    ~LteUeMac() override;
    void DoDispose() override;

    /**
     * \brief TracedCallback signature for RA response timeout events
     * exporting IMSI, contention flag, preamble transmission counter
     * and the max limit of preamble transmission
     *
     * \param [in] imsi
     * \param [in] contention
     * \param [in] preambleTxCounter
     * \param [in] maxPreambleTxLimit
     */
    typedef void (*RaResponseTimeoutTracedCallback)(uint64_t imsi,
                                                    bool contention,
                                                    uint8_t preambleTxCounter,
                                                    uint8_t maxPreambleTxLimit);

    /**
     * \brief Get the LTE MAC SAP provider
     * \return a pointer to the LTE MAC SAP provider
     */
    LteMacSapProvider* GetLteMacSapProvider();
    /**
     * \brief Set the LTE UE CMAC SAP user
     * \param s the LTE UE CMAC SAP User
     */
    void SetLteUeCmacSapUser(LteUeCmacSapUser* s);
    /**
     * \brief Get the LTE CMAC SAP provider
     * \return a pointer to the LTE CMAC SAP provider
     */
    LteUeCmacSapProvider* GetLteUeCmacSapProvider();

    /**
     * \brief Set the component carried ID
     * \param index the component carrier ID
     */
    void SetComponentCarrierId(uint8_t index);

    /**
     * \brief Get the PHY SAP user
     * \return a pointer to the SAP user of the PHY
     */
    LteUePhySapUser* GetLteUePhySapUser();

    /**
     * \brief Set the PHY SAP Provider
     * \param s a pointer to the PHY SAP Provider
     */
    void SetLteUePhySapProvider(LteUePhySapProvider* s);

    /**
     * \brief Forwarded from LteUePhySapUser: trigger the start from a new frame
     *
     * \param frameNo frame number
     * \param subframeNo subframe number
     */
    void DoSubframeIndication(uint32_t frameNo, uint32_t subframeNo);

    /**
     * Assign a fixed random variable stream number to the random variables
     * used by this model.  Return the number of streams (possibly zero) that
     * have been assigned.
     *
     * \param stream first stream index to use
     * \return the number of stream indices assigned by this model
     */
    int64_t AssignStreams(int64_t stream);

  private:
    // forwarded from MAC SAP
    /**
     * Transmit PDU function
     *
     * \param params LteMacSapProvider::TransmitPduParameters
     */
    void DoTransmitPdu(LteMacSapProvider::TransmitPduParameters params);
    /**
     * Report buffers status function
     *
     * \param params LteMacSapProvider::ReportBufferStatusParameters
     */
    void DoReportBufferStatus(LteMacSapProvider::ReportBufferStatusParameters params);

    // forwarded from UE CMAC SAP
    /**
     * Configure RACH function
     *
     * \param rc LteUeCmacSapProvider::RachConfig
     */
    void DoConfigureRach(LteUeCmacSapProvider::RachConfig rc);
    /**
     * Start contention based random access procedure function
     */
    void DoStartContentionBasedRandomAccessProcedure();
    /**
     * Set RNTI
     *
     * \param rnti the RNTI
     */
    void DoSetRnti(uint16_t rnti);
    /**
     * Start non contention based random access procedure function
     *
     * \param rnti the RNTI
     * \param rapId the RAPID
     * \param prachMask the PRACH mask
     */
    void DoStartNonContentionBasedRandomAccessProcedure(uint16_t rnti,
                                                        uint8_t rapId,
                                                        uint8_t prachMask);
    /**
     * Add LC function
     *
     * \param lcId the LCID
     * \param lcConfig the logical channel config
     * \param msu the MSU
     */
    void DoAddLc(uint8_t lcId,
                 LteUeCmacSapProvider::LogicalChannelConfig lcConfig,
                 LteMacSapUser* msu);
    /**
     * Remove LC function
     *
     * \param lcId the LCID
     */
    void DoRemoveLc(uint8_t lcId);
    /**
     * \brief Reset function
     */
    void DoReset();
    /**
     * \brief Notify MAC about the successful RRC connection
     * establishment.
     */
    void DoNotifyConnectionSuccessful();
    /**
     * Set IMSI
     *
     * \param imsi the IMSI of the UE
     */
    void DoSetImsi(uint64_t imsi);

    // forwarded from PHY SAP
    /**
     * Receive Phy PDU function
     *
     * \param p the packet
     */
    void DoReceivePhyPdu(Ptr<Packet> p);
    /**
     * Receive LTE control message function
     *
     * \param msg the LTE control message
     */
    void DoReceiveLteControlMessage(Ptr<LteControlMessage> msg);

    // internal methods
    /// Randomly select and send RA preamble function
    void RandomlySelectAndSendRaPreamble();
    /**
     * Send RA preamble function
     *
     * \param contention if true randomly select and send the RA preamble
     */
    void SendRaPreamble(bool contention);
    /// Start waiting for RA response function
    void StartWaitingForRaResponse();
    /**
     * Receive the RA response function
     *
     * \param raResponse RA response received
     */
    void RecvRaResponse(BuildRarListElement_s raResponse);
    /**
     * RA response timeout function
     *
     * \param contention if true randomly select and send the RA preamble
     */
    void RaResponseTimeout(bool contention);
    /// Send report buffer status
    void SendReportBufferStatus();
    /// Refresh HARQ processes packet buffer function
    void RefreshHarqProcessesPacketBuffer();

    /// component carrier Id --> used to address sap
    uint8_t m_componentCarrierId;

  private:
    /// LcInfo structure
    struct LcInfo
    {
        LteUeCmacSapProvider::LogicalChannelConfig lcConfig; ///< logical channel config
        LteMacSapUser* macSapUser;                           ///< MAC SAP user
    };

    std::map<uint8_t, LcInfo> m_lcInfoMap; ///< logical channel info map

    LteMacSapProvider* m_macSapProvider; ///< MAC SAP provider

    LteUeCmacSapUser* m_cmacSapUser;         ///< CMAC SAP user
    LteUeCmacSapProvider* m_cmacSapProvider; ///< CMAC SAP provider

    LteUePhySapProvider* m_uePhySapProvider; ///< UE Phy SAP provider
    LteUePhySapUser* m_uePhySapUser;         ///< UE Phy SAP user

    std::map<uint8_t, LteMacSapProvider::ReportBufferStatusParameters>
        m_ulBsrReceived; ///< BSR received from RLC (the last one)

    Time m_bsrPeriodicity; ///< BSR periodicity
    Time m_bsrLast;        ///< BSR last

    bool m_freshUlBsr; ///< true when a BSR has been received in the last TTI

    uint8_t m_harqProcessId; ///< HARQ process ID
    std::vector<Ptr<PacketBurst>>
        m_miUlHarqProcessesPacket; ///< Packets under transmission of the UL HARQ processes
    std::vector<uint8_t> m_miUlHarqProcessesPacketTimer; ///< timer for packet life in the buffer

    uint16_t m_rnti; ///< RNTI
    uint16_t m_imsi; ///< IMSI

    bool m_rachConfigured;                                  ///< is RACH configured?
    LteUeCmacSapProvider::RachConfig m_rachConfig;          ///< RACH configuration
    uint8_t m_raPreambleId;                                 ///< RA preamble ID
    uint8_t m_preambleTransmissionCounter;                  ///< preamble tranamission counter
    uint16_t m_backoffParameter;                            ///< backoff parameter
    EventId m_noRaResponseReceivedEvent;                    ///< no RA response received event ID
    Ptr<UniformRandomVariable> m_raPreambleUniformVariable; ///< RA preamble random variable

    uint32_t m_frameNo;          ///< frame number
    uint32_t m_subframeNo;       ///< subframe number
    uint8_t m_raRnti;            ///< RA RNTI
    bool m_waitingForRaResponse; ///< waiting for RA response

    /**
     * \brief The `RaResponseTimeout` trace source. Fired RA response timeout.
     * Exporting IMSI, contention flag, preamble transmission counter
     * and the max limit of preamble transmission.
     */
    TracedCallback<uint64_t, bool, uint8_t, uint8_t> m_raResponseTimeoutTrace;
};

} // namespace ns3

#endif // LTE_UE_MAC_ENTITY
