/*
 * Copyright (c) 2014 Piotr Gawlowicz
 *
 * 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: Piotr Gawlowicz <gawlowicz.p@gmail.com>
 *
 */

#include "lte-ffr-simple.h"

#include "ns3/lte-rrc-sap.h"
#include <ns3/log.h>

namespace ns3
{

NS_LOG_COMPONENT_DEFINE("LteFfrSimple");

NS_OBJECT_ENSURE_REGISTERED(LteFfrSimple);

LteFfrSimple::LteFfrSimple()
    : m_ffrSapUser(nullptr),
      m_ffrRrcSapUser(nullptr),
      m_dlOffset(0),
      m_dlSubBand(0),
      m_ulOffset(0),
      m_ulSubBand(0),
      m_measId(0),
      m_changePdschConfigDedicated(false),
      m_tpc(1),
      m_tpcNum(0),
      m_accumulatedMode(false)
{
    NS_LOG_FUNCTION(this);
    m_ffrSapProvider = new MemberLteFfrSapProvider<LteFfrSimple>(this);
    m_ffrRrcSapProvider = new MemberLteFfrRrcSapProvider<LteFfrSimple>(this);
}

LteFfrSimple::~LteFfrSimple()
{
    NS_LOG_FUNCTION(this);
}

void
LteFfrSimple::DoDispose()
{
    NS_LOG_FUNCTION(this);
    delete m_ffrSapProvider;
    delete m_ffrRrcSapProvider;
}

TypeId
LteFfrSimple::GetTypeId()
{
    static TypeId tid =
        TypeId("ns3::LteFfrSimple")
            .SetParent<LteFfrAlgorithm>()
            .AddConstructor<LteFfrSimple>()
            .AddAttribute("UlSubBandOffset",
                          "Uplink Offset in number of Resource Block Groups",
                          UintegerValue(0),
                          MakeUintegerAccessor(&LteFfrSimple::m_ulOffset),
                          MakeUintegerChecker<uint8_t>())
            .AddAttribute(
                "UlSubBandwidth",
                "Uplink Transmission SubBandwidth Configuration in number of Resource Block Groups",
                UintegerValue(25),
                MakeUintegerAccessor(&LteFfrSimple::m_ulSubBand),
                MakeUintegerChecker<uint8_t>())
            .AddAttribute("DlSubBandOffset",
                          "Downlink Offset in number of Resource Block Groups",
                          UintegerValue(0),
                          MakeUintegerAccessor(&LteFfrSimple::m_dlOffset),
                          MakeUintegerChecker<uint8_t>())
            .AddAttribute("DlSubBandwidth",
                          "Downlink Transmission SubBandwidth Configuration in number of Resource "
                          "Block Groups",
                          UintegerValue(12),
                          MakeUintegerAccessor(&LteFfrSimple::m_dlSubBand),
                          MakeUintegerChecker<uint8_t>())
            .AddTraceSource(
                "ChangePdschConfigDedicated",
                "trace fired upon change of PdschConfigDedicated",
                MakeTraceSourceAccessor(&LteFfrSimple::m_changePdschConfigDedicatedTrace),
                "ns3::LteFfrSimple::PdschTracedCallback");
    return tid;
}

void
LteFfrSimple::SetLteFfrSapUser(LteFfrSapUser* s)
{
    NS_LOG_FUNCTION(this << s);
    m_ffrSapUser = s;
}

LteFfrSapProvider*
LteFfrSimple::GetLteFfrSapProvider()
{
    NS_LOG_FUNCTION(this);
    return m_ffrSapProvider;
}

void
LteFfrSimple::SetLteFfrRrcSapUser(LteFfrRrcSapUser* s)
{
    NS_LOG_FUNCTION(this << s);
    m_ffrRrcSapUser = s;
}

LteFfrRrcSapProvider*
LteFfrSimple::GetLteFfrRrcSapProvider()
{
    NS_LOG_FUNCTION(this);
    return m_ffrRrcSapProvider;
}

void
LteFfrSimple::DoInitialize()
{
    NS_LOG_FUNCTION(this);
    LteFfrAlgorithm::DoInitialize();

    NS_LOG_LOGIC(this << " requesting Event A4 measurements"
                      << " (threshold = 0"
                      << ")");
    LteRrcSap::ReportConfigEutra reportConfig;
    reportConfig.eventId = LteRrcSap::ReportConfigEutra::EVENT_A1;
    reportConfig.threshold1.choice = LteRrcSap::ThresholdEutra::THRESHOLD_RSRQ;
    reportConfig.threshold1.range = 0;
    reportConfig.triggerQuantity = LteRrcSap::ReportConfigEutra::RSRQ;
    reportConfig.reportInterval = LteRrcSap::ReportConfigEutra::MS120;
    m_measId = m_ffrRrcSapUser->AddUeMeasReportConfigForFfr(reportConfig);

    m_pdschConfigDedicated.pa = LteRrcSap::PdschConfigDedicated::dB0;
}

void
LteFfrSimple::Reconfigure()
{
    NS_LOG_FUNCTION(this);
}

void
LteFfrSimple::ChangePdschConfigDedicated(bool change)
{
    m_changePdschConfigDedicated = change;
}

void
LteFfrSimple::SetPdschConfigDedicated(LteRrcSap::PdschConfigDedicated pdschConfigDedicated)
{
    m_pdschConfigDedicated = pdschConfigDedicated;
}

void
LteFfrSimple::SetTpc(uint32_t tpc, uint32_t num, bool acculumatedMode)
{
    m_tpc = tpc;
    m_tpcNum = num;
    m_accumulatedMode = acculumatedMode;
}

std::vector<bool>
LteFfrSimple::DoGetAvailableDlRbg()
{
    NS_LOG_FUNCTION(this);

    if (m_dlRbgMap.empty())
    {
        int rbgSize = GetRbgSize(m_dlBandwidth);
        m_dlRbgMap.resize(m_dlBandwidth / rbgSize, true);

        for (uint8_t i = m_dlOffset; i < (m_dlOffset + m_dlSubBand); i++)
        {
            m_dlRbgMap[i] = false;
        }
    }

    return m_dlRbgMap;
}

bool
LteFfrSimple::DoIsDlRbgAvailableForUe(int i, uint16_t rnti)
{
    NS_LOG_FUNCTION(this);
    return true;
}

std::vector<bool>
LteFfrSimple::DoGetAvailableUlRbg()
{
    NS_LOG_FUNCTION(this);

    if (m_ulRbgMap.empty())
    {
        m_ulRbgMap.resize(m_ulBandwidth, true);

        for (uint8_t i = m_ulOffset; i < (m_ulOffset + m_ulSubBand); i++)
        {
            m_ulRbgMap[i] = false;
        }
    }

    return m_ulRbgMap;
}

bool
LteFfrSimple::DoIsUlRbgAvailableForUe(int i, uint16_t rnti)
{
    NS_LOG_FUNCTION(this);
    return true;
}

void
LteFfrSimple::DoReportDlCqiInfo(const FfMacSchedSapProvider::SchedDlCqiInfoReqParameters& params)
{
    NS_LOG_FUNCTION(this);
}

void
LteFfrSimple::DoReportUlCqiInfo(const FfMacSchedSapProvider::SchedUlCqiInfoReqParameters& params)
{
    NS_LOG_FUNCTION(this);
}

void
LteFfrSimple::DoReportUlCqiInfo(std::map<uint16_t, std::vector<double>> ulCqiMap)
{
    NS_LOG_FUNCTION(this);
}

uint8_t
LteFfrSimple::DoGetTpc(uint16_t rnti)
{
    NS_LOG_FUNCTION(this);

    if (m_accumulatedMode)
    {
        if (m_tpcNum > 0)
        {
            m_tpcNum--;
            return m_tpc;
        }
        else
        {
            return 1;
        }
    }
    else
    {
        return m_tpc;
    }

    return 1; // 1 is mapped to 0 for Accumulated mode, and to -1 in Absolute mode TS36.213
              // Table 5.1.1.1-2
}

uint16_t
LteFfrSimple::DoGetMinContinuousUlBandwidth()
{
    NS_LOG_FUNCTION(this);
    return m_ulBandwidth;
}

void
LteFfrSimple::DoReportUeMeas(uint16_t rnti, LteRrcSap::MeasResults measResults)
{
    NS_LOG_FUNCTION(this << rnti << (uint16_t)measResults.measId);

    std::map<uint16_t, LteRrcSap::PdschConfigDedicated>::iterator it;

    it = m_ues.find(rnti);

    if (it == m_ues.end())
    {
        LteRrcSap::PdschConfigDedicated pdschConfigDedicated;
        pdschConfigDedicated.pa = LteRrcSap::PdschConfigDedicated::dB0;
        m_ues.insert(
            std::pair<uint16_t, LteRrcSap::PdschConfigDedicated>(rnti, pdschConfigDedicated));
    }

    if (m_changePdschConfigDedicated)
    {
        UpdatePdschConfigDedicated();
    }
}

void
LteFfrSimple::UpdatePdschConfigDedicated()
{
    NS_LOG_FUNCTION(this);

    std::map<uint16_t, LteRrcSap::PdschConfigDedicated>::iterator it;
    for (it = m_ues.begin(); it != m_ues.end(); it++)
    {
        if (it->second.pa != m_pdschConfigDedicated.pa)
        {
            m_changePdschConfigDedicatedTrace(it->first, m_pdschConfigDedicated.pa);
            LteRrcSap::PdschConfigDedicated pdschConfigDedicated = m_pdschConfigDedicated;
            m_ffrRrcSapUser->SetPdschConfigDedicated(it->first, pdschConfigDedicated);
        }
    }
}

void
LteFfrSimple::DoRecvLoadInformation(EpcX2Sap::LoadInformationParams params)
{
    NS_LOG_FUNCTION(this);
}

} // end of namespace ns3
