/* -*- 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 "config.h"

#include "singleton.h"

#include "object.h"

#include "global-value.h"

#include "object-vector.h"

#include "pointer.h"

#include "log.h"

#include <sstream>

NS_LOG_COMPONENT_DEFINE ("Config");

namespace ns3 {

class ArrayMatcher

{

public:

  ArrayMatcher (std::string element);

  bool Matches (uint32_t i) const;

private:

  bool StringToUint32 (std::string str, uint32_t *value) const;

  std::string m_element;

};

ArrayMatcher::ArrayMatcher (std::string element)

  : m_element (element)

{}

bool 

ArrayMatcher::Matches (uint32_t i) const

{

  if (m_element == "*")

    {

      NS_LOG_DEBUG ("Array "<<i<<" matches *");

      return true;

    }

  std::string::size_type tmp;

  tmp = m_element.find ("|");

  if (tmp != std::string::npos)

    {

      std::string left = m_element.substr (0, tmp-0);

      std::string right = m_element.substr (tmp+1, m_element.size () - (tmp + 1));

      ArrayMatcher matcher = ArrayMatcher (left);

      if (matcher.Matches (i))

	{

	  NS_LOG_DEBUG ("Array "<<i<<" matches "<<left);

	  return true;

	}

      matcher = ArrayMatcher (right);

      if (matcher.Matches (i))

	{

	  NS_LOG_DEBUG ("Array "<<i<<" matches "<<right);

	  return true;

	}

      NS_LOG_DEBUG ("Array "<<i<<" does not match "<<m_element);

      return false;

    }

  std::string::size_type leftBracket = m_element.find ("[");

  std::string::size_type rightBracket = m_element.find ("]");

  std::string::size_type dash = m_element.find ("-");

  if (leftBracket == 0 && rightBracket == m_element.size () - 1 &&

      dash > leftBracket && dash < rightBracket)

    {

      std::string lowerBound = m_element.substr (leftBracket + 1, dash - (leftBracket + 1));

      std::string upperBound = m_element.substr (dash + 1, rightBracket - (dash + 1));

      uint32_t min;

      uint32_t max;

      if (StringToUint32 (lowerBound, &min) && 

	  StringToUint32 (upperBound, &max) &&

	  i >= min && i <= max)

        {

	  NS_LOG_DEBUG ("Array "<<i<<" matches "<<m_element);

          return true;

        }

      else

	{

	  NS_LOG_DEBUG ("Array "<<i<<" does not "<<m_element);

	  return false;

	}

    }

  uint32_t value;

  if (StringToUint32 (m_element, &value) &&

      i == value)

    {

      NS_LOG_DEBUG ("Array "<<i<<" matches "<<m_element);

      return true;

    }

  NS_LOG_DEBUG ("Array "<<i<<" does not match "<<m_element);

  return false;

}

bool

ArrayMatcher::StringToUint32 (std::string str, uint32_t *value) const

{

  std::istringstream iss;

  iss.str (str);

  iss >> (*value);

  return !iss.bad () && !iss.fail ();

}

class Resolver

{

public:

  Resolver (std::string path);

  virtual ~Resolver ();

  void Resolve (Ptr<Object> root);

private:

  void DoResolve (std::string path, Ptr<Object> root);

  void DoResolveOne (Ptr<Object> object, std::string name);

  std::string GetResolvedPath (std::string name) const;

  virtual void DoOne (Ptr<Object> object, std::string path, std::string name) = 0;

  std::vector<std::string> m_workStack;

  std::string m_path;

};

Resolver::Resolver (std::string path)

  : m_path (path)

{}

Resolver::~Resolver ()

{}

void 

Resolver::Resolve (Ptr<Object> root)

{

  DoResolve (m_path, root);

}

std::string

Resolver::GetResolvedPath (std::string name) const

{

  std::string fullPath = "";

  for (std::vector<std::string>::const_iterator i = m_workStack.begin (); i != m_workStack.end (); i++)

    {

      fullPath += "/" + *i;

    }

  fullPath += "/" + name;

  return fullPath;

}

void 

Resolver::DoResolveOne (Ptr<Object> object, std::string name)

{

  NS_LOG_DEBUG ("resolved="<<GetResolvedPath (name));

  DoOne (object, GetResolvedPath (name), name);

}

void

Resolver::DoResolve (std::string path, Ptr<Object> root)

{

  NS_ASSERT (path != "");

  std::string::size_type pos = path.find ("/");

  if (pos != 0)

    {

      NS_FATAL_ERROR ("path does not start with a \"/\": \""<<path<<"\"");

      return;

    }

  std::string::size_type next = path.find ("/", 1);

  if (next == std::string::npos)

    {

      std::string attributeName = path.substr (1, path.size ()-1);

      NS_LOG_DEBUG ("handle attr="<<attributeName);

      DoOne (root, GetResolvedPath (attributeName), attributeName);

      return;

    }

  std::string item = path.substr (1, next-1);

  std::string pathLeft = path.substr (next, path.size ()-next);

  std::string::size_type dollarPos = item.find ("$");

  if (dollarPos == 0)

    {

      // This is a call to GetObject

      std::string tidString = item.substr (1, item.size () - 1);

      NS_LOG_DEBUG ("GetObject="<<tidString<<"on path="<<GetResolvedPath (""));

      TypeId tid = TypeId::LookupByName (tidString);

      Ptr<Object> object = root->GetObject<Object> (tid);

      if (object == 0)

	{

	  NS_LOG_DEBUG ("GetObject ("<<tidString<<") failed on path="<<GetResolvedPath (""));

	  return;

	}

      m_workStack.push_back (item);

      DoResolve (pathLeft, object);

      m_workStack.pop_back ();

    }

  else 

    {

      // this is a normal attribute.

      TypeId tid = root->GetInstanceTypeId ();

      struct TypeId::AttributeInfo info;

      if (!tid.LookupAttributeByName (item, &info))

	{

	  NS_LOG_DEBUG ("Requested item="<<item<<" does not exist on path="<<GetResolvedPath (""));

	  return;

	}

      // attempt to cast to a pointer checker.

      const PointerChecker *ptr = dynamic_cast<const PointerChecker *> (PeekPointer (info.checker));

      if (ptr != 0)

	{

	  NS_LOG_DEBUG ("GetAttribute(ptr)="<<item<<" on path="<<GetResolvedPath (""));

	  if (object == 0)

	    {

	      NS_LOG_ERROR ("Requested object name=\""<<item<<

			    "\" exists on path=\""<<GetResolvedPath ("")<<"\""

			    " but is null.");

	      return;

	    }

	  m_workStack.push_back (item);

	  DoResolve (pathLeft, object);

	  m_workStack.pop_back ();

	}

      // attempt to cast to an object vector.

      const ObjectVectorChecker *vectorChecker = dynamic_cast<const ObjectVectorChecker *> (PeekPointer (info.checker));

      if (vectorChecker != 0)

	{

	  NS_LOG_DEBUG ("GetAttribute(vector)="<<item<<" on path="<<GetResolvedPath (""));

	  m_workStack.push_back (item);

	  DoArrayResolve (pathLeft, vector);

	  m_workStack.pop_back ();

	}

      // this could be anything else and we don't know what to do with it.

      // So, we just ignore it.

    }

}

void 

{

  NS_ASSERT (path != "");

  std::string::size_type pos = path.find ("/");

  if (pos != 0)

    {

      NS_FATAL_ERROR ("path does not start with a \"/\": \""<<path<<"\"");

      return;

    }

  std::string::size_type next = path.find ("/", 1);

  if (next == std::string::npos)

    {

      NS_LOG_DEBUG ("vector path includes no index data on path=\""<<path<<"\"");

      return;

    }

  std::string item = path.substr (1, next-1);

  std::string pathLeft = path.substr (next, path.size ()-next);

  ArrayMatcher matcher = ArrayMatcher (item);

  for (uint32_t i = 0; i < vector.GetN (); i++)

    {

      if (matcher.Matches (i))

	{

	  std::ostringstream oss;

	  oss << i;

	  m_workStack.push_back (oss.str ());

	  DoResolve (pathLeft, vector.Get (i));

	  m_workStack.pop_back ();

	}

    }

}

class ConfigImpl 

{

public:

  void ConnectWithoutContext (std::string path, const CallbackBase &cb);

  void Connect (std::string path, const CallbackBase &cb);

  void DisconnectWithoutContext (std::string path, const CallbackBase &cb);

  void Disconnect (std::string path, const CallbackBase &cb);

  void RegisterRootNamespaceObject (Ptr<Object> obj);

  void UnregisterRootNamespaceObject (Ptr<Object> obj);

  uint32_t GetRootNamespaceObjectN (void) const;

  Ptr<Object> GetRootNamespaceObject (uint32_t i) const;

private:

  typedef std::vector<Ptr<Object> > Roots;

  Roots m_roots;

};

void 

{

  class SetResolver : public Resolver 

  {

  public:

      : Resolver (path),

  private:

    virtual void DoOne (Ptr<Object> object, std::string path, std::string name) {

    }

  } resolver = SetResolver (path, value);

  for (Roots::const_iterator i = m_roots.begin (); i != m_roots.end (); i++)

    {

      resolver.Resolve (*i);

    }

}

void 

ConfigImpl::ConnectWithoutContext (std::string path, const CallbackBase &cb)

{

  class ConnectResolver : public Resolver 

  {

  public:

    ConnectResolver (std::string path, const CallbackBase &cb)

      : Resolver (path),

	m_cb (cb) {}

  private:

    virtual void DoOne (Ptr<Object> object, std::string path, std::string name) {

      object->TraceConnectWithoutContext (name, m_cb);

    }

    CallbackBase m_cb;

  } resolver = ConnectResolver (path, cb);

  for (Roots::const_iterator i = m_roots.begin (); i != m_roots.end (); i++)

    {

      resolver.Resolve (*i);

    }

}

void 

ConfigImpl::DisconnectWithoutContext (std::string path, const CallbackBase &cb)

{

  class DisconnectResolver : public Resolver 

  {

  public:

    DisconnectResolver (std::string path, const CallbackBase &cb)

      : Resolver (path),

	m_cb (cb) {}

  private:

    virtual void DoOne (Ptr<Object> object, std::string path, std::string name) {

      object->TraceDisconnectWithoutContext (name, m_cb);

    }

    CallbackBase m_cb;

  } resolver = DisconnectResolver (path, cb);

  for (Roots::const_iterator i = m_roots.begin (); i != m_roots.end (); i++)

    {

      resolver.Resolve (*i);

    }

}

void 

ConfigImpl::Connect (std::string path, const CallbackBase &cb)

{

  class ConnectWithContextResolver : public Resolver 

  {

  public:

    ConnectWithContextResolver (std::string path, const CallbackBase &cb)

      : Resolver (path),

	m_cb (cb) {}

  private:

    virtual void DoOne (Ptr<Object> object, std::string path, std::string name) {

      object->TraceConnect (name, path, m_cb);

    }

    CallbackBase m_cb;

  } resolver = ConnectWithContextResolver (path, cb);

  for (Roots::const_iterator i = m_roots.begin (); i != m_roots.end (); i++)

    {

      resolver.Resolve (*i);

    }

}

void 

ConfigImpl::Disconnect (std::string path, const CallbackBase &cb)

{

  class DisconnectWithContextResolver : public Resolver 

  {

  public:

    DisconnectWithContextResolver (std::string path, const CallbackBase &cb)

      : Resolver (path),

	m_cb (cb) {}

  private:

    virtual void DoOne (Ptr<Object> object, std::string path, std::string name) {

      object->TraceDisconnect (name, path, m_cb);

    }

    CallbackBase m_cb;

  } resolver = DisconnectWithContextResolver (path, cb);

  for (Roots::const_iterator i = m_roots.begin (); i != m_roots.end (); i++)

    {

      resolver.Resolve (*i);

    }

}

void 

ConfigImpl::RegisterRootNamespaceObject (Ptr<Object> obj)

{

  m_roots.push_back (obj);

}

void 

ConfigImpl::UnregisterRootNamespaceObject (Ptr<Object> obj)

{

  for (std::vector<Ptr<Object> >::iterator i = m_roots.begin (); i != m_roots.end (); i++)

    {

      if (*i == obj)

	{

	  m_roots.erase (i);

	  return;

	}

    }

}

uint32_t 

ConfigImpl::GetRootNamespaceObjectN (void) const

{

  return m_roots.size ();

}

Ptr<Object> 

ConfigImpl::GetRootNamespaceObject (uint32_t i) const

{

  return m_roots[i];

}

namespace Config {

{

  Singleton<ConfigImpl>::Get ()->Set (path, value);

}

{

  AttributeList::GetGlobal ()->Set (name, value);

}

{

  return AttributeList::GetGlobal ()->SetFailSafe (name, value);

}

{

  GlobalValue::Bind (name, value);

}

{

  return GlobalValue::BindFailSafe (name, value);

}

void ConnectWithoutContext (std::string path, const CallbackBase &cb)

{

  Singleton<ConfigImpl>::Get ()->ConnectWithoutContext (path, cb);

}

void DisconnectWithoutContext (std::string path, const CallbackBase &cb)

{

  Singleton<ConfigImpl>::Get ()->DisconnectWithoutContext (path, cb);

}

void 

Connect (std::string path, const CallbackBase &cb)

{

  Singleton<ConfigImpl>::Get ()->Connect (path, cb);

}

void 

Disconnect (std::string path, const CallbackBase &cb)

{

  Singleton<ConfigImpl>::Get ()->Disconnect (path, cb);

}

void RegisterRootNamespaceObject (Ptr<Object> obj)

{

  Singleton<ConfigImpl>::Get ()->RegisterRootNamespaceObject (obj);

}

void UnregisterRootNamespaceObject (Ptr<Object> obj)

{

  Singleton<ConfigImpl>::Get ()->UnregisterRootNamespaceObject (obj);

}

uint32_t GetRootNamespaceObjectN (void)

{

  return Singleton<ConfigImpl>::Get ()->GetRootNamespaceObjectN ();

}

Ptr<Object> GetRootNamespaceObject (uint32_t i)

{

  return Singleton<ConfigImpl>::Get ()->GetRootNamespaceObject (i);

}

} // namespace Config

} // namespace ns3

#ifdef RUN_SELF_TESTS

#include "test.h"

#include "integer.h"

#include "traced-value.h"

#include "trace-source-accessor.h"

#include "callback.h"

namespace ns3 {

class MyNode : public Object

{

public:

  static TypeId GetTypeId (void);