/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2011 UCLA
 *
 * 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:  Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 *          Ilya Moiseenko <iliamo@cs.ucla.edu>
 */

#include "ns3/assert.h"
#include "ns3/log.h"
#include "ns3/object.h"
#include "ns3/names.h"
#include "ns3/packet-socket-factory.h"
#include "ns3/config.h"
#include "ns3/simulator.h"
#include "ns3/string.h"
#include "ns3/net-device.h"
#include "ns3/channel.h"
#include "ns3/callback.h"
#include "ns3/node.h"
#include "ns3/core-config.h"
#include "ns3/point-to-point-net-device.h"
#include "ns3/point-to-point-helper.h"
#include "ns3/callback.h"

#include "../model/ndn-net-device-face.hpp"
#include "../model/ndn-l3-protocol.hpp"

#include "ns3/ndn-forwarding-strategy.hpp"
#include "ns3/ndn-fib.hpp"
#include "ns3/ndn-pit.hpp"
#include "ns3/ndn-content-store.hpp"

#include "ns3/node-list.h"

#include "ns3/data-rate.h"

#include "ndn-face-container.hpp"
#include "ndn-stack-helper.hpp"

#include <limits>
#include <map>
#include <boost/foreach.hpp>
#include <boost/lexical_cast.hpp>

NS_LOG_COMPONENT_DEFINE("ndn.StackHelper");

namespace ns3 {
namespace ndn {

StackHelper::StackHelper()
  : m_limitsEnabled(false)
  , m_needSetDefaultRoutes(false)
{
  m_ndnFactory.SetTypeId("ns3::ndn::L3Protocol");
  m_strategyFactory.SetTypeId("ns3::ndn::fw::Flooding");
  m_contentStoreFactory.SetTypeId("ns3::ndn::cs::Lru");
  m_fibFactory.SetTypeId("ns3::ndn::fib::Default");
  m_pitFactory.SetTypeId("ns3::ndn::pit::Persistent");

  m_netDeviceCallbacks.push_back(
    std::make_pair(PointToPointNetDevice::GetTypeId(),
                   MakeCallback(&StackHelper::PointToPointNetDeviceCallback, this)));
  // default callback will be fired if non of others callbacks fit or did the job
}

StackHelper::~StackHelper()
{
}

void
StackHelper::SetStackAttributes(const std::string& attr1, const std::string& value1,
                                const std::string& attr2, const std::string& value2,
                                const std::string& attr3, const std::string& value3,
                                const std::string& attr4, const std::string& value4)
{
  if (attr1 != "")
    m_ndnFactory.Set(attr1, StringValue(value1));
  if (attr2 != "")
    m_ndnFactory.Set(attr2, StringValue(value2));
  if (attr3 != "")
    m_ndnFactory.Set(attr3, StringValue(value3));
  if (attr4 != "")
    m_ndnFactory.Set(attr4, StringValue(value4));
}

void
StackHelper::SetForwardingStrategy(const std::string& strategy, const std::string& attr1,
                                   const std::string& value1, const std::string& attr2,
                                   const std::string& value2, const std::string& attr3,
                                   const std::string& value3, const std::string& attr4,
                                   const std::string& value4)
{
  m_strategyFactory.SetTypeId(strategy);
  if (attr1 != "")
    m_strategyFactory.Set(attr1, StringValue(value1));
  if (attr2 != "")
    m_strategyFactory.Set(attr2, StringValue(value2));
  if (attr3 != "")
    m_strategyFactory.Set(attr3, StringValue(value3));
  if (attr4 != "")
    m_strategyFactory.Set(attr4, StringValue(value4));
}

void
StackHelper::SetContentStore(const std::string& contentStore, const std::string& attr1,
                             const std::string& value1, const std::string& attr2,
                             const std::string& value2, const std::string& attr3,
                             const std::string& value3, const std::string& attr4,
                             const std::string& value4)
{
  m_contentStoreFactory.SetTypeId(contentStore);
  if (attr1 != "")
    m_contentStoreFactory.Set(attr1, StringValue(value1));
  if (attr2 != "")
    m_contentStoreFactory.Set(attr2, StringValue(value2));
  if (attr3 != "")
    m_contentStoreFactory.Set(attr3, StringValue(value3));
  if (attr4 != "")
    m_contentStoreFactory.Set(attr4, StringValue(value4));
}

void
StackHelper::SetPit(const std::string& pitClass, const std::string& attr1,
                    const std::string& value1, const std::string& attr2, const std::string& value2,
                    const std::string& attr3, const std::string& value3, const std::string& attr4,
                    const std::string& value4)
{
  m_pitFactory.SetTypeId(pitClass);
  if (attr1 != "")
    m_pitFactory.Set(attr1, StringValue(value1));
  if (attr2 != "")
    m_pitFactory.Set(attr2, StringValue(value2));
  if (attr3 != "")
    m_pitFactory.Set(attr3, StringValue(value3));
  if (attr4 != "")
    m_pitFactory.Set(attr4, StringValue(value4));
}

void
StackHelper::SetFib(const std::string& fibClass, const std::string& attr1,
                    const std::string& value1, const std::string& attr2, const std::string& value2,
                    const std::string& attr3, const std::string& value3, const std::string& attr4,
                    const std::string& value4)
{
  m_fibFactory.SetTypeId(fibClass);
  if (attr1 != "")
    m_fibFactory.Set(attr1, StringValue(value1));
  if (attr2 != "")
    m_fibFactory.Set(attr2, StringValue(value2));
  if (attr3 != "")
    m_fibFactory.Set(attr3, StringValue(value3));
  if (attr4 != "")
    m_fibFactory.Set(attr4, StringValue(value4));
}

void
StackHelper::SetDefaultRoutes(bool needSet)
{
  NS_LOG_FUNCTION(this << needSet);
  m_needSetDefaultRoutes = needSet;
}

void
StackHelper::EnableLimits(bool enable /* = true*/, Time avgRtt /*=Seconds(0.1)*/,
                          uint32_t avgData /*=1100*/, uint32_t avgInterest /*=40*/)
{
  NS_LOG_INFO("EnableLimits: " << enable);
  m_limitsEnabled = enable;
  m_avgRtt = avgRtt;
  m_avgDataSize = avgData;
  m_avgInterestSize = avgInterest;
}

Ptr<FaceContainer>
StackHelper::Install(const NodeContainer& c) const
{
  Ptr<FaceContainer> faces = Create<FaceContainer>();
  for (NodeContainer::Iterator i = c.Begin(); i != c.End(); ++i) {
    faces->AddAll(Install(*i));
  }
  return faces;
}

Ptr<FaceContainer>
StackHelper::InstallAll() const
{
  return Install(NodeContainer::GetGlobal());
}

Ptr<FaceContainer>
StackHelper::Install(Ptr<Node> node) const
{
  // NS_ASSERT_MSG (m_forwarding, "SetForwardingHelper() should be set prior calling Install()
  // method");
  Ptr<FaceContainer> faces = Create<FaceContainer>();

  if (node->GetObject<L3Protocol>() != 0) {
    NS_FATAL_ERROR("StackHelper::Install (): Installing "
                   "a NdnStack to a node with an existing Ndn object");
    return 0;
  }

  // Create L3Protocol
  Ptr<L3Protocol> ndn = m_ndnFactory.Create<L3Protocol>();

  // Create and aggregate FIB
  Ptr<Fib> fib = m_fibFactory.Create<Fib>();
  ndn->AggregateObject(fib);

  // Create and aggregate PIT
  ndn->AggregateObject(m_pitFactory.Create<Pit>());

  // Create and aggregate forwarding strategy
  ndn->AggregateObject(m_strategyFactory.Create<ForwardingStrategy>());

  // Create and aggregate content store
  ndn->AggregateObject(m_contentStoreFactory.Create<ContentStore>());

  // Aggregate L3Protocol on node
  node->AggregateObject(ndn);

  for (uint32_t index = 0; index < node->GetNDevices(); index++) {
    Ptr<NetDevice> device = node->GetDevice(index);
    // This check does not make sense: LoopbackNetDevice is installed only if IP stack is installed,
    // Normally, ndnSIM works without IP stack, so no reason to check
    // if (DynamicCast<LoopbackNetDevice> (device) != 0)
    //   continue; // don't create face for a LoopbackNetDevice

    Ptr<NetDeviceFace> face;

    for (std::list<std::pair<TypeId, NetDeviceFaceCreateCallback>>::const_iterator item =
           m_netDeviceCallbacks.begin();
         item != m_netDeviceCallbacks.end(); item++) {
      if (device->GetInstanceTypeId() == item->first
          || device->GetInstanceTypeId().IsChildOf(item->first)) {
        face = item->second(node, ndn, device);
        if (face != 0)
          break;
      }
    }
    if (face == 0) {
      face = DefaultNetDeviceCallback(node, ndn, device);
    }

    if (m_needSetDefaultRoutes) {
      // default route with lowest priority possible
      AddRoute(node, "/", StaticCast<Face>(face), std::numeric_limits<int32_t>::max());
    }

    face->SetUp();
    faces->Add(face);
  }

  return faces;
}

void
StackHelper::AddNetDeviceFaceCreateCallback(TypeId netDeviceType,
                                            StackHelper::NetDeviceFaceCreateCallback callback)
{
  m_netDeviceCallbacks.push_back(std::make_pair(netDeviceType, callback));
}

void
StackHelper::UpdateNetDeviceFaceCreateCallback(TypeId netDeviceType,
                                               NetDeviceFaceCreateCallback callback)
{
  for (NetDeviceCallbackList::iterator i = m_netDeviceCallbacks.begin();
       i != m_netDeviceCallbacks.end(); i++) {
    if (i->first == netDeviceType) {
      i->second = callback;
      return;
    }
  }
}

void
StackHelper::RemoveNetDeviceFaceCreateCallback(TypeId netDeviceType,
                                               NetDeviceFaceCreateCallback callback)
{
  for (NetDeviceCallbackList::iterator i = m_netDeviceCallbacks.begin();
       i != m_netDeviceCallbacks.end(); i++) {
    if (i->first == netDeviceType) {
      m_netDeviceCallbacks.erase(i);
      return;
    }
  }
}

Ptr<NetDeviceFace>
StackHelper::DefaultNetDeviceCallback(Ptr<Node> node, Ptr<L3Protocol> ndn,
                                      Ptr<NetDevice> netDevice) const
{
  NS_LOG_DEBUG("Creating default NetDeviceFace on node " << node->GetId());

  Ptr<NetDeviceFace> face = CreateObject<NetDeviceFace>(node, netDevice);

  ndn->AddFace(face);
  NS_LOG_LOGIC("Node " << node->GetId() << ": added NetDeviceFace as face #" << *face);

  return face;
}

Ptr<NetDeviceFace>
StackHelper::PointToPointNetDeviceCallback(Ptr<Node> node, Ptr<L3Protocol> ndn,
                                           Ptr<NetDevice> device) const
{
  NS_LOG_DEBUG("Creating point-to-point NetDeviceFace on node " << node->GetId());

  Ptr<NetDeviceFace> face = CreateObject<NetDeviceFace>(node, device);

  ndn->AddFace(face);
  NS_LOG_LOGIC("Node " << node->GetId() << ": added NetDeviceFace as face #" << *face);

  if (m_limitsEnabled) {
    Ptr<Limits> limits = face->GetObject<Limits>();
    if (limits == 0) {
      NS_FATAL_ERROR("Limits are enabled, but the selected forwarding strategy does not support "
                     "limits. Please revise your scenario");
      exit(1);
    }

    NS_LOG_INFO("Limits are enabled");
    Ptr<PointToPointNetDevice> p2p = DynamicCast<PointToPointNetDevice>(device);
    if (p2p != 0) {
      // Setup bucket filtering
      // Assume that we know average data packet size, and this size is equal default size
      // Set maximum buckets (averaging over 1 second)

      DataRateValue dataRate;
      device->GetAttribute("DataRate", dataRate);
      TimeValue linkDelay;
      device->GetChannel()->GetAttribute("Delay", linkDelay);

      NS_LOG_INFO("DataRate for this link is " << dataRate.Get());

      double maxInterestPackets =
        1.0 * dataRate.Get().GetBitRate() / 8.0 / (m_avgDataSize + m_avgInterestSize);
      // NS_LOG_INFO ("Max packets per second: " << maxInterestPackets);
      // NS_LOG_INFO ("Max burst: " << m_avgRtt.ToDouble (Time::S) * maxInterestPackets);
      NS_LOG_INFO("MaxLimit: " << (int)(m_avgRtt.ToDouble(Time::S) * maxInterestPackets));

      // Set max to BDP
      limits->SetLimits(maxInterestPackets, m_avgRtt.ToDouble(Time::S));
      limits->SetLinkDelay(linkDelay.Get().ToDouble(Time::S));
    }
  }

  return face;
}

Ptr<FaceContainer>
StackHelper::Install(const std::string& nodeName) const
{
  Ptr<Node> node = Names::Find<Node>(nodeName);
  return Install(node);
}

void
StackHelper::AddRoute(Ptr<Node> node, const std::string& prefix, Ptr<Face> face, int32_t metric)
{
  NS_LOG_LOGIC("[" << node->GetId() << "]$ route add " << prefix << " via " << *face << " metric "
                   << metric);

  Ptr<Fib> fib = node->GetObject<Fib>();

  NameValue prefixValue;
  prefixValue.DeserializeFromString(prefix, MakeNameChecker());
  fib->Add(prefixValue.Get(), face, metric);
}

void
StackHelper::AddRoute(Ptr<Node> node, const std::string& prefix, uint32_t faceId, int32_t metric)
{
  Ptr<L3Protocol> ndn = node->GetObject<L3Protocol>();
  NS_ASSERT_MSG(ndn != 0, "Ndn stack should be installed on the node");

  Ptr<Face> face = ndn->GetFace(faceId);
  NS_ASSERT_MSG(face != 0, "Face with ID [" << faceId << "] does not exist on node ["
                                            << node->GetId() << "]");

  AddRoute(node, prefix, face, metric);
}

void
StackHelper::AddRoute(const std::string& nodeName, const std::string& prefix, uint32_t faceId,
                      int32_t metric)
{
  Ptr<Node> node = Names::Find<Node>(nodeName);
  NS_ASSERT_MSG(node != 0, "Node [" << nodeName << "] does not exist");

  Ptr<L3Protocol> ndn = node->GetObject<L3Protocol>();
  NS_ASSERT_MSG(ndn != 0, "Ndn stack should be installed on the node");

  Ptr<Face> face = ndn->GetFace(faceId);
  NS_ASSERT_MSG(face != 0, "Face with ID [" << faceId << "] does not exist on node [" << nodeName
                                            << "]");

  AddRoute(node, prefix, face, metric);
}

void
StackHelper::AddRoute(Ptr<Node> node, const std::string& prefix, Ptr<Node> otherNode,
                      int32_t metric)
{
  for (uint32_t deviceId = 0; deviceId < node->GetNDevices(); deviceId++) {
    Ptr<PointToPointNetDevice> netDevice =
      DynamicCast<PointToPointNetDevice>(node->GetDevice(deviceId));
    if (netDevice == 0)
      continue;

    Ptr<Channel> channel = netDevice->GetChannel();
    if (channel == 0)
      continue;

    if (channel->GetDevice(0)->GetNode() == otherNode
        || channel->GetDevice(1)->GetNode() == otherNode) {
      Ptr<L3Protocol> ndn = node->GetObject<L3Protocol>();
      NS_ASSERT_MSG(ndn != 0, "Ndn stack should be installed on the node");

      Ptr<Face> face = ndn->GetFaceByNetDevice(netDevice);
      NS_ASSERT_MSG(face != 0, "There is no face associated with the p2p link");

      AddRoute(node, prefix, face, metric);

      return;
    }
  }

  NS_FATAL_ERROR("Cannot add route: Node# " << node->GetId() << " and Node# " << otherNode->GetId()
                                            << " are not connected");
}

void
StackHelper::AddRoute(const std::string& nodeName, const std::string& prefix,
                      const std::string& otherNodeName, int32_t metric)
{
  Ptr<Node> node = Names::Find<Node>(nodeName);
  NS_ASSERT_MSG(node != 0, "Node [" << nodeName << "] does not exist");

  Ptr<Node> otherNode = Names::Find<Node>(otherNodeName);
  NS_ASSERT_MSG(otherNode != 0, "Node [" << otherNodeName << "] does not exist");

  AddRoute(node, prefix, otherNode, metric);
}

} // namespace ndn
} // namespace ns3