#ifndef ATTRIBUTE_H

#define ATTRIBUTE_H

#include <string>

#include <stdint.h>

#include "ptr.h"

#include "object-base.h"

namespace ns3 {

class AttributeAccessor;

class AttributeChecker;

class Attribute;

class AttributeValue

{

public:

  AttributeValue ();

  AttributeValue (const AttributeValue &o);

  AttributeValue &operator = (const AttributeValue &o);

  virtual ~AttributeValue ();

  virtual Attribute Copy (void) const = 0;

  virtual std::string SerializeToString (Ptr<const AttributeChecker> checker) const = 0;

  virtual bool DeserializeFromString (std::string value, Ptr<const AttributeChecker> checker) = 0;

private:

  friend class Attribute;

  uint32_t m_count;

};

class Attribute

{

public:

  Attribute ();

  Attribute (const Attribute &o);

  Attribute &operator = (const Attribute &o);

  ~Attribute ();

  Attribute Copy (void) const;

  std::string SerializeToString (Ptr<const AttributeChecker> checker) const;

  bool DeserializeFromString (std::string value, Ptr<const AttributeChecker> checker);

  template <typename T>

  static Attribute Create (void);

  template <typename T, typename T1>

  static Attribute Create (T1 a1);

  template <typename T>

  T DynCast (void) const;

  template <typename T>

  Attribute (Ptr<T> pointer);

  template <typename T>

  operator Ptr<T> ();

private:

  Attribute (AttributeValue *value);

  AttributeValue *m_value;

};

class AttributeAccessor : public ObjectBase

{

public:

  AttributeAccessor ();

  void Ref (void) const;

  void Unref (void) const;

  virtual ~AttributeAccessor ();

  /**

   * \param object the object instance to set the value in

   * \param value the value to set

   * \returns true if the value is valid and it could be set

   *          successfully, false otherwise.

   */

  virtual bool Set (ObjectBase * object, Attribute value) const = 0;

  virtual bool Get (const ObjectBase * object, Attribute value) const = 0;

private:

  mutable uint32_t m_count;

};

class AttributeChecker : public ObjectBase

{

public:

  AttributeChecker ();

  void Ref (void) const;

  void Unref (void) const;

  virtual ~AttributeChecker ();

  virtual bool Check (Attribute value) const = 0;

  virtual Attribute Create (void) const = 0;

private:

  mutable uint32_t m_count;

};

template <typename T, typename BASE>

Ptr<AttributeChecker>

MakeSimpleAttributeChecker (void);

template <typename T, typename U>

Ptr<const AttributeAccessor>

MakePtrAccessor (Ptr<U> T::*memberVariable);

template <typename T, typename U>

Ptr<const AttributeAccessor>

MakePtrAccessor (void (T::*setter) (Ptr<U>));

template <typename T, typename U>

Ptr<const AttributeAccessor>

MakePtrAccessor (Ptr<U> (T::*getter) (void) const);

class PtrChecker : public AttributeChecker {};

template <typename T>

Ptr<AttributeChecker> MakePtrChecker (void);

} // namespace ns3

namespace ns3 {

/********************************************************

 *   The class used to access the pointer stored in a

 *   PtrValue<T> AttributeValue instance.

 ********************************************************/

class PtrValueBase : public AttributeValue

{

public:

  virtual ObjectBase *PeekObjectBase (void) const = 0;

  virtual bool SetObjectBase (ObjectBase *object) = 0;

  virtual std::string SerializeToString (Ptr<const AttributeChecker> checker) const;

  virtual bool DeserializeFromString (std::string value, Ptr<const AttributeChecker> checker);

};

/********************************************************

 *        Store the content of a Ptr<T> in a AttributeValue

 ********************************************************/

namespace internal {

template <typename T>

class PtrValue : public PtrValueBase

{

public:

  PtrValue () 

    : m_pointer () {}

  PtrValue (Ptr<T> pointer) 

    : m_pointer (pointer) {}

  virtual ObjectBase *PeekObjectBase (void) const {

    return PeekPointer (m_pointer);

  }

  virtual bool SetObjectBase (ObjectBase *object) {

    T *ptr = dynamic_cast<T *> (object);

    if (ptr == 0)

      {

	return false;

      }

    m_pointer = ptr;

    return true;

  }

  virtual Attribute Copy (void) const {

    return Attribute::Create<PtrValue<T> > (*this);

  }

private:

  Ptr<T> m_pointer;

};

template <typename T>

class APtrChecker : public PtrChecker

{

  virtual bool Check (Attribute val) const {

    const PtrValueBase *value = val.DynCast<const PtrValueBase *> ();

    if (value == 0)

      {

	return false;

      }

    if (value->PeekObjectBase () == 0)

      {

	return true;

      }

    T *ptr = dynamic_cast<T*> (value->PeekObjectBase ());

    if (ptr == 0)

      {

	return false;

      }

    return true;

  }

  virtual Attribute Create (void) const {

    return Attribute::Create<PtrValue<T> > ();

  }

};

/********************************************************

 *              The Accessor associated to 

 *               PtrValue<T>

 ********************************************************/

template <typename T, typename U>

class PtrAccessor : public AttributeAccessor

{

public:

  virtual ~PtrAccessor () {}

  virtual bool Set (ObjectBase * object, Attribute val) const {

      T *obj = dynamic_cast<T *> (object);

      if (obj == 0)

        {

          return false;

        }

      const PtrValueBase *value = val.DynCast<const PtrValueBase *> ();

      if (value == 0)

        {

          return false;

        }

      Ptr<U> ptr = dynamic_cast<U*> (value->PeekObjectBase ());

      if (ptr == 0)

        {

          return false;

        }

      DoSet (obj, ptr);

      return true;

    }

  virtual bool Get (const ObjectBase * object, Attribute val) const {

      const T *obj = dynamic_cast<const T *> (object);

      if (obj == 0)

        {

          return false;

        }

      PtrValueBase *value = val.DynCast<PtrValueBase *> ();

      if (value == 0)

        {

          return false;

        }

      return value->SetObjectBase (PeekPointer (DoGet (obj)));

    }

private:

  virtual void DoSet (T *object, Ptr<U> value) const = 0;

  virtual Ptr<U> DoGet (const T *object) const = 0;

};

} // namespace internal

/********************************************************

 *        The implementation of the Attribute 

 *          class template methods.

 ********************************************************/

template <typename T>

Attribute 

Attribute::Create (void)

{

  return Attribute (new T ());

}

template <typename T, typename T1>

Attribute 

Attribute::Create (T1 a1)

{

  return Attribute (new T (a1));

}

template <typename T>

T

Attribute::DynCast (void) const

{

  return dynamic_cast<T> (m_value);

}

template <typename T>

Attribute::Attribute (Ptr<T> pointer)

  : m_value (new internal::PtrValue<T> (pointer))

{}

template <typename T>

Attribute::operator Ptr<T> ()

{

  PtrValueBase *value = DynCast<PtrValueBase *> ();

  if (value == 0)

    {

      return 0;

    }

  ObjectBase *objectBase = value->PeekObjectBase ();

  T *obj = dynamic_cast<T *> (objectBase);

  if (obj == 0)

    {

      return 0;

    }

  return obj;

}

template <typename T, typename U>

Ptr<const AttributeAccessor>

MakePtrAccessor (Ptr<U> T::*memberVariable)

{

  struct MemberVariable : public internal::PtrAccessor<T,U>

  {

    Ptr<U> T::*m_memberVariable;

    virtual void DoSet (T *object, Ptr<U> value) const {

      (object->*m_memberVariable) = value;

    }

    virtual Ptr<U> DoGet (const T *object) const {

      return object->*m_memberVariable;

    }

  } *spec = new MemberVariable ();

  spec->m_memberVariable = memberVariable;

  return Ptr<const AttributeAccessor> (spec, false);

}

template <typename T, typename U>

Ptr<const AttributeAccessor>

MakePtrAccessor (void (T::*setter) (Ptr<U>))

{

  struct MemberMethod : public internal::PtrAccessor<T,U>

  {

    void (T::*m_setter) (Ptr<U>);

    virtual void DoSet (T *object, Ptr<U> value) const {

      (object->*m_setter) (value);

    }

    virtual Ptr<U> DoGet (const T *object) const {

      return 0;

      //return (object->*m_getter) ();

    }

  } *spec = new MemberMethod ();

  spec->m_setter = setter;

  return Ptr<const AttributeAccessor> (spec, false);

}

template <typename T, typename U>

Ptr<const AttributeAccessor>

MakePtrAccessor (Ptr<U> (T::*getter) (void) const)

{

  struct MemberMethod : public internal::PtrAccessor<T,U>

  {

    Ptr<U> (T::*m_getter) (void) const;

    virtual void DoSet (T *object, Ptr<U> value) const {

      //(object->*m_setter) (value);

    }

    virtual Ptr<U> DoGet (const T *object) const {

      return (object->*m_getter) ();

    }

  } *spec = new MemberMethod ();

  spec->m_getter = getter;

  return Ptr<const AttributeAccessor> (spec, false);

}

template <typename T>

Ptr<AttributeChecker>

MakePtrChecker (void)

{

  return Create<internal::APtrChecker<T> > ();

}

template <typename T, typename BASE>

Ptr<AttributeChecker>

MakeSimpleAttributeChecker (void)

{

  struct SimpleAttributeChecker : public BASE

  {

    virtual bool Check (Attribute value) const {

      return value.DynCast<const T *> () != 0;

    }

    virtual Attribute Create (void) const {

      return Attribute::Create<T> ();

    }

  } *checker = new SimpleAttributeChecker ();

  return Ptr<AttributeChecker> (checker, false);

}

} // namespace ns3

#endif /* ATTRIBUTE_H */