/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2011-2015  Regents of the University of California.
 *
 * This file is part of ndnSIM. See AUTHORS for complete list of ndnSIM authors and
 * contributors.
 *
 * ndnSIM is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * ndnSIM 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
 * ndnSIM, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 **/

#include "ndn-stack-helper.hpp"

#include "ns3/log.h"
#include "ns3/names.h"
#include "ns3/string.h"
#include "ns3/point-to-point-net-device.h"

#include "model/ndn-l3-protocol.hpp"
#include "model/ndn-net-device-face.hpp"
#include "utils/ndn-time.hpp"
#include "utils/dummy-keychain.hpp"
#include "model/cs/ndn-content-store.hpp"

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

NS_LOG_COMPONENT_DEFINE("ndn.StackHelper");

namespace ns3 {
namespace ndn {

StackHelper::StackHelper()
  : m_needSetDefaultRoutes(false)
  , m_shouldUseNfdCs(true)
{
  setCustomNdnCxxClocks();

  m_ndnFactory.SetTypeId("ns3::ndn::L3Protocol");
  m_contentStoreFactory.SetTypeId("ns3::ndn::cs::Lru");

  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()
{
}

KeyChain&
StackHelper::getKeyChain()
{
  static ::ndn::DummyKeyChain keyChain;
  return keyChain;
}

void
StackHelper::setCustomNdnCxxClocks()
{
  ::ndn::time::setCustomClocks(make_shared<ns3::ndn::time::CustomSteadyClock>(),
                               make_shared<ns3::ndn::time::CustomSystemClock>());
}

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

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::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)
{
  NS_ASSERT_MSG(m_shouldUseNfdCs == false,
                "First choose not to use NFD's CS and then select the replacement policy");

  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::SetContentStoreChoice(bool shouldUseNfdCs)
{
  m_shouldUseNfdCs = shouldUseNfdCs;
}

bool
StackHelper::shouldUseNfdCs() const
{
  return m_shouldUseNfdCs;
}

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
{
  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;
  }

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

  // NFD initialization
  ndn->initialize(m_shouldUseNfdCs);

  // Create and aggregate content store if NFD's contest store has been disabled
  if (!m_shouldUseNfdCs)
    ndn->AggregateObject(m_contentStoreFactory.Create<ContentStore>());

  // Aggregate L3Protocol on node (must be after setting ndnSIM CS)
  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

    shared_ptr<NetDeviceFace> face;

    for (const auto& item : m_netDeviceCallbacks) {
      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
      FibHelper::AddRoute(node, "/", face, std::numeric_limits<int32_t>::max());
    }

    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 (auto& i : m_netDeviceCallbacks) {
    if (i.first == netDeviceType) {
      i.second = callback;
      return;
    }
  }
}

void
StackHelper::RemoveNetDeviceFaceCreateCallback(TypeId netDeviceType,
                                               NetDeviceFaceCreateCallback callback)
{
  m_netDeviceCallbacks.remove_if([&] (const std::pair<TypeId, NetDeviceFaceCreateCallback>& i) {
      return (i.first == netDeviceType);
    });
}

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

  shared_ptr<NetDeviceFace> face = std::make_shared<NetDeviceFace>(node, netDevice);

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

  return face;
}

shared_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());

  shared_ptr<NetDeviceFace> face = std::make_shared<NetDeviceFace>(node, device);

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

  return face;
}

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

} // namespace ndn
} // namespace ns3