/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2008 INRIA
 *
 * 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
 *
 * Authors: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */
#include "enum.h"
#include "fatal-error.h"
#include "log.h"
#include <algorithm>  // find_if
#include <sstream>
#include <numeric> // std::accumulate

/**
 * \file
 * \ingroup attribute_Enum
 * ns3::EnumValue attribute value implementation.
 */

namespace ns3 {

NS_LOG_COMPONENT_DEFINE ("Enum");

EnumValue::EnumValue ()
  : m_value ()
{
  NS_LOG_FUNCTION (this);
}
EnumValue::EnumValue (int value)
  : m_value (value)
{
  NS_LOG_FUNCTION (this << value);
}
void
EnumValue::Set (int value)
{
  NS_LOG_FUNCTION (this << value);
  m_value = value;
}
int
EnumValue::Get (void) const
{
  NS_LOG_FUNCTION (this);
  return m_value;
}
Ptr<AttributeValue>
EnumValue::Copy (void) const
{
  NS_LOG_FUNCTION (this);
  return ns3::Create<EnumValue> (*this);
}
std::string
EnumValue::SerializeToString (Ptr<const AttributeChecker> checker) const
{
  NS_LOG_FUNCTION (this << checker);
  const EnumChecker *p = dynamic_cast<const EnumChecker *> (PeekPointer (checker));
  NS_ASSERT (p != 0);
  std::string name = p->GetName (m_value);
  return name;
}
bool
EnumValue::DeserializeFromString (std::string value, Ptr<const AttributeChecker> checker)
{
  NS_LOG_FUNCTION (this << value << checker);
  const EnumChecker *p = dynamic_cast<const EnumChecker *> (PeekPointer (checker));
  NS_ASSERT (p != 0);
  m_value = p->GetValue (value);
  return true;
}

EnumChecker::EnumChecker ()
{
  NS_LOG_FUNCTION (this);
}

void
EnumChecker::AddDefault (int value, std::string name)
{
  NS_LOG_FUNCTION (this << value << name);
  m_valueSet.push_front (std::make_pair (value, name));
}
void
EnumChecker::Add (int value, std::string name)
{
  NS_LOG_FUNCTION (this << value << name);
  m_valueSet.push_back (std::make_pair (value, name));
}
std::string
EnumChecker::GetName (int value) const
{
  auto it = std::find_if (m_valueSet.begin (), m_valueSet.end (),
                          [value] (Value v) { return v.first == value; } );
  NS_ASSERT_MSG (it != m_valueSet.end (),
                 "invalid enum value " << value << "! Missed entry in MakeEnumChecker?");
  return it->second;
}
int
EnumChecker::GetValue (const std::string name) const
{
  auto it = std::find_if (m_valueSet.begin (), m_valueSet.end (),
                          [name] (Value v) { return v.second == name; } );
  NS_ASSERT_MSG (it != m_valueSet.end (),
                 "name " << name << " is not a valid enum value. Missed entry in MakeEnumChecker?\nAvailable values: " <<
                 std::accumulate (m_valueSet.begin (), m_valueSet.end (), std::string{}, [](std::string a, Value v) {
                   if (a.empty ())
                     {
                       return v.second;
                     }
                   else
                     {
                       return std::move (a) + ", " + v.second;
                     }
                 }));
  return it->first;
}
bool
EnumChecker::Check (const AttributeValue &value) const
{
  NS_LOG_FUNCTION (this << &value);
  const EnumValue *p = dynamic_cast<const EnumValue *> (&value);
  if (p == 0)
    {
      return false;
    }
  auto pvalue = p->Get ();
  auto it = std::find_if (m_valueSet.begin (), m_valueSet.end (),
                          [pvalue] (Value v) { return v.first == pvalue; } );
  return (it != m_valueSet.end ());
}
std::string
EnumChecker::GetValueTypeName (void) const
{
  NS_LOG_FUNCTION (this);
  return "ns3::EnumValue";
}
bool
EnumChecker::HasUnderlyingTypeInformation (void) const
{
  NS_LOG_FUNCTION (this);
  return true;
}
std::string
EnumChecker::GetUnderlyingTypeInformation (void) const
{
  NS_LOG_FUNCTION (this);
  std::ostringstream oss;
  bool moreValues = false;
  for (const auto &i : m_valueSet)
    {
      oss << (moreValues ? "|" : "") << i.second;
      moreValues = true;
    }
  return oss.str ();
}
Ptr<AttributeValue>
EnumChecker::Create (void) const
{
  NS_LOG_FUNCTION (this);
  return ns3::Create<EnumValue> ();
}

bool
EnumChecker::Copy (const AttributeValue &source, AttributeValue &destination) const
{
  NS_LOG_FUNCTION (this << &source << &destination);
  const EnumValue *src = dynamic_cast<const EnumValue *> (&source);
  EnumValue *dst = dynamic_cast<EnumValue *> (&destination);
  if (src == 0 || dst == 0)
    {
      return false;
    }
  *dst = *src;
  return true;
}


} // namespace ns3