/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
 * Copyright (C) 2013 Regents of the University of California.
 * See COPYING for copyright and distribution information.
 */

#ifndef NDN_MANAGEMENT_NFD_CONTROL_PARAMETERS_HPP
#define NDN_MANAGEMENT_NFD_CONTROL_PARAMETERS_HPP

#include "../name.hpp"
#include "../encoding/tlv-nfd.hpp"

namespace ndn {
namespace nfd {

enum ControlParameterField {
  CONTROL_PARAMETER_NAME,
  CONTROL_PARAMETER_FACE_ID,
  CONTROL_PARAMETER_URI,
  CONTROL_PARAMETER_LOCAL_CONTROL_FEATURE,
  CONTROL_PARAMETER_COST,
  CONTROL_PARAMETER_STRATEGY,
  CONTROL_PARAMETER_UBOUND
};

const std::string CONTROL_PARAMETER_FIELD[CONTROL_PARAMETER_UBOUND] = {
  "Name",
  "FaceId",
  "Uri",
  "LocalControlFeature",
  "Cost",
  "Strategy",
};

enum LocalControlFeature {
  LOCAL_CONTROL_FEATURE_INCOMING_FACE_ID = 1,
  LOCAL_CONTROL_FEATURE_NEXT_HOP_FACE_ID = 2
};

/** \brief represents parameters in a ControlCommand request or response
 *  \sa http://redmine.named-data.net/projects/nfd/wiki/ControlCommand
 */
class ControlParameters
{
public:
  class Error : public Tlv::Error
  {
  public:
    explicit
    Error(const std::string& what)
      : Tlv::Error(what)
    {
    }
  };

  ControlParameters()
    : m_hasFields(CONTROL_PARAMETER_UBOUND)
  {
  }

  explicit
  ControlParameters(const Block& block)
    : m_hasFields(CONTROL_PARAMETER_UBOUND)
  {
    wireDecode(block);
  }

  template<bool T>
  size_t
  wireEncode(EncodingImpl<T>& encoder) const;

  const Block&
  wireEncode() const;

  void
  wireDecode(const Block& wire);

public: // getters & setters
  bool
  hasName() const
  {
    return m_hasFields[CONTROL_PARAMETER_NAME];
  }

  const Name&
  getName() const
  {
    BOOST_ASSERT(this->hasName());
    return m_name;
  }

  ControlParameters&
  setName(const Name& name)
  {
    m_wire.reset();
    m_name = name;
    m_hasFields[CONTROL_PARAMETER_NAME] = true;
    return *this;
  }

  ControlParameters&
  unsetName()
  {
    m_wire.reset();
    m_hasFields[CONTROL_PARAMETER_NAME] = false;
    return *this;
  }

  bool
  hasFaceId() const
  {
    return m_hasFields[CONTROL_PARAMETER_FACE_ID];
  }

  uint64_t
  getFaceId() const
  {
    BOOST_ASSERT(this->hasFaceId());
    return m_faceId;
  }

  ControlParameters&
  setFaceId(uint64_t faceId)
  {
    m_wire.reset();
    m_faceId = faceId;
    m_hasFields[CONTROL_PARAMETER_FACE_ID] = true;
    return *this;
  }

  ControlParameters&
  unsetFaceId()
  {
    m_wire.reset();
    m_hasFields[CONTROL_PARAMETER_FACE_ID] = false;
    return *this;
  }

  bool
  hasUri() const
  {
    return m_hasFields[CONTROL_PARAMETER_URI];
  }

  const std::string&
  getUri() const
  {
    BOOST_ASSERT(this->hasUri());
    return m_uri;
  }

  ControlParameters&
  setUri(const std::string& uri)
  {
    m_wire.reset();
    m_uri = uri;
    m_hasFields[CONTROL_PARAMETER_URI] = true;
    return *this;
  }

  ControlParameters&
  unsetUri()
  {
    m_wire.reset();
    m_hasFields[CONTROL_PARAMETER_URI] = false;
    return *this;
  }

  bool
  hasLocalControlFeature() const
  {
    return m_hasFields[CONTROL_PARAMETER_LOCAL_CONTROL_FEATURE];
  }

  LocalControlFeature
  getLocalControlFeature() const
  {
    BOOST_ASSERT(this->hasLocalControlFeature());
    return m_localControlFeature;
  }

  ControlParameters&
  setLocalControlFeature(LocalControlFeature localControlFeature)
  {
    m_wire.reset();
    m_localControlFeature = localControlFeature;
    m_hasFields[CONTROL_PARAMETER_LOCAL_CONTROL_FEATURE] = true;
    return *this;
  }

  ControlParameters&
  unsetLocalControlFeature()
  {
    m_wire.reset();
    m_hasFields[CONTROL_PARAMETER_LOCAL_CONTROL_FEATURE] = false;
    return *this;
  }

  bool
  hasCost() const
  {
    return m_hasFields[CONTROL_PARAMETER_COST];
  }

  uint64_t
  getCost() const
  {
    BOOST_ASSERT(this->hasCost());
    return m_cost;
  }

  ControlParameters&
  setCost(uint64_t cost)
  {
    m_wire.reset();
    m_cost = cost;
    m_hasFields[CONTROL_PARAMETER_COST] = true;
    return *this;
  }

  ControlParameters&
  unsetCost()
  {
    m_wire.reset();
    m_hasFields[CONTROL_PARAMETER_COST] = false;
    return *this;
  }

  bool
  hasStrategy() const
  {
    return m_hasFields[CONTROL_PARAMETER_STRATEGY];
  }

  const Name&
  getStrategy() const
  {
    BOOST_ASSERT(this->hasStrategy());
    return m_strategy;
  }

  ControlParameters&
  setStrategy(const Name& strategy)
  {
    m_wire.reset();
    m_strategy = strategy;
    m_hasFields[CONTROL_PARAMETER_STRATEGY] = true;
    return *this;
  }

  ControlParameters&
  unsetStrategy()
  {
    m_wire.reset();
    m_hasFields[CONTROL_PARAMETER_STRATEGY] = false;
    return *this;
  }

  const std::vector<bool>&
  getPresentFields() const
  {
    return m_hasFields;
  }

private: // fields
  std::vector<bool>   m_hasFields;

  Name                m_name;
  uint64_t            m_faceId;
  std::string         m_uri;
  LocalControlFeature m_localControlFeature;
  uint64_t            m_cost;
  Name                m_strategy;

private:
  mutable Block m_wire;
};


template<bool T>
inline size_t
ControlParameters::wireEncode(EncodingImpl<T>& encoder) const
{
  size_t totalLength = 0;

  if (this->hasStrategy()) {
    totalLength += prependNestedBlock(encoder, tlv::nfd::Strategy, m_strategy);
  }
  if (this->hasCost()) {
    totalLength += prependNonNegativeIntegerBlock(encoder, tlv::nfd::Cost, m_cost);
  }
  if (this->hasLocalControlFeature()) {
    totalLength += prependNonNegativeIntegerBlock(encoder,
                   tlv::nfd::LocalControlFeature, m_localControlFeature);
  }
  if (this->hasUri()) {
    size_t valLength = encoder.prependByteArray(
                       reinterpret_cast<const uint8_t*>(m_uri.c_str()), m_uri.size());
    totalLength += valLength;
    totalLength += encoder.prependVarNumber(valLength);
    totalLength += encoder.prependVarNumber(tlv::nfd::Uri);
  }
  if (this->hasFaceId()) {
    totalLength += prependNonNegativeIntegerBlock(encoder, tlv::nfd::FaceId, m_faceId);
  }
  if (this->hasName()) {
    totalLength += m_name.wireEncode(encoder);
  }

  totalLength += encoder.prependVarNumber(totalLength);
  totalLength += encoder.prependVarNumber(tlv::nfd::ControlParameters);
  return totalLength;
}

inline const Block&
ControlParameters::wireEncode() const
{
  if (m_wire.hasWire())
    return m_wire;

  EncodingEstimator estimator;
  size_t estimatedSize = wireEncode(estimator);

  EncodingBuffer buffer(estimatedSize, 0);
  wireEncode(buffer);

  m_wire = buffer.block();
  return m_wire;
}

inline void
ControlParameters::wireDecode(const Block& block)
{
  if (block.type() != tlv::nfd::ControlParameters) {
    throw Error("expecting TLV-TYPE ControlParameters");
  }
  m_wire = block;
  m_wire.parse();
  Block::element_const_iterator val;

  val = m_wire.find(Tlv::Name);
  m_hasFields[CONTROL_PARAMETER_NAME] = val != m_wire.elements_end();
  if (this->hasName()) {
    m_name.wireDecode(*val);
  }

  val = m_wire.find(tlv::nfd::FaceId);
  m_hasFields[CONTROL_PARAMETER_FACE_ID] = val != m_wire.elements_end();
  if (this->hasFaceId()) {
    m_faceId = static_cast<uint64_t>(readNonNegativeInteger(*val));
  }

  val = m_wire.find(tlv::nfd::Uri);
  m_hasFields[CONTROL_PARAMETER_URI] = val != m_wire.elements_end();
  if (this->hasUri()) {
    m_uri.assign(reinterpret_cast<const char*>(val->value()), val->value_size());
  }

  val = m_wire.find(tlv::nfd::LocalControlFeature);
  m_hasFields[CONTROL_PARAMETER_LOCAL_CONTROL_FEATURE] = val != m_wire.elements_end();
  if (this->hasLocalControlFeature()) {
    m_localControlFeature = static_cast<LocalControlFeature>(readNonNegativeInteger(*val));
  }

  val = m_wire.find(tlv::nfd::Cost);
  m_hasFields[CONTROL_PARAMETER_COST] = val != m_wire.elements_end();
  if (this->hasCost()) {
    m_cost = static_cast<uint64_t>(readNonNegativeInteger(*val));
  }

  val = m_wire.find(tlv::nfd::Strategy);
  m_hasFields[CONTROL_PARAMETER_STRATEGY] = val != m_wire.elements_end();
  if (this->hasStrategy()) {
    val->parse();
    if (val->elements().empty()) {
      throw Error("expecting Strategy/Name");
    }
    else {
      m_strategy.wireDecode(*val->elements_begin());
    }
  }
}

inline std::ostream&
operator<<(std::ostream& os, const ControlParameters& parameters)
{
  os << "ControlParameters(";

  if (parameters.hasName()) {
    os << "Name: " << parameters.getName() << ", ";
  }

  if (parameters.hasFaceId()) {
    os << "FaceId: " << parameters.getFaceId() << ", ";
  }

  if (parameters.hasUri()) {
    os << "Uri: " << parameters.getUri() << ", ";
  }

  if (parameters.hasLocalControlFeature()) {
    os << "LocalControlFeature: " << parameters.getLocalControlFeature() << ", ";
  }

  if (parameters.hasCost()) {
    os << "Cost: " << parameters.getCost() << ", ";
  }

  if (parameters.hasStrategy()) {
    os << "Strategy: " << parameters.getStrategy() << ", ";
  }

  os << ")";
  return os;
}


} // namespace nfd
} // namespace ndn

#endif // NDN_MANAGEMENT_NFD_CONTROL_PARAMETERS_HPP