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

 * NAN - Native Abstractions for Node.js

 *

 * Copyright (c) 2016 NAN contributors

 *

 * MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>

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

#ifndef NAN_OBJECT_WRAP_H_

#define NAN_OBJECT_WRAP_H_

class ObjectWrap {

 public:

  ObjectWrap() {

    refs_ = 0;

  }

  virtual ~ObjectWrap() {

    if (persistent().IsEmpty()) {

      return;

    }

    assert(persistent().IsNearDeath());

    persistent().ClearWeak();

    persistent().Reset();

  }

  template <class T>

  static inline T* Unwrap(v8::Local<v8::Object> object) {

    assert(!object.IsEmpty());

    assert(object->InternalFieldCount() > 0);

    // Cast to ObjectWrap before casting to T.  A direct cast from void

    // to T won't work right when T has more than one base class.

    void* ptr = GetInternalFieldPointer(object, 0);

    ObjectWrap* wrap = static_cast<ObjectWrap*>(ptr);

    return static_cast<T*>(wrap);

  }

  inline v8::Local<v8::Object> handle() const {

    return New(handle_);

  }

  inline Persistent<v8::Object>& persistent() {

    return handle_;

  }

 protected:

  inline void Wrap(v8::Local<v8::Object> object) {

    assert(persistent().IsEmpty());

    assert(object->InternalFieldCount() > 0);

    SetInternalFieldPointer(object, 0, this);

    persistent().Reset(object);

    MakeWeak();

  }

#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \

  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))

  inline void MakeWeak() {

    persistent().v8::PersistentBase<v8::Object>::SetWeak(

        this, WeakCallback, v8::WeakCallbackType::kParameter);

    persistent().MarkIndependent();

  }

#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION

  inline void MakeWeak() {

    persistent().v8::PersistentBase<v8::Object>::SetWeak(this, WeakCallback);

    persistent().MarkIndependent();

  }

#else

  inline void MakeWeak() {

    persistent().persistent.MakeWeak(this, WeakCallback);

    persistent().MarkIndependent();

  }

#endif

  /* Ref() marks the object as being attached to an event loop.

   * Refed objects will not be garbage collected, even if

   * all references are lost.

   */

  virtual void Ref() {

    assert(!persistent().IsEmpty());

    persistent().ClearWeak();

    refs_++;

  }

  /* Unref() marks an object as detached from the event loop.  This is its

   * default state.  When an object with a "weak" reference changes from

   * attached to detached state it will be freed. Be careful not to access

   * the object after making this call as it might be gone!

   * (A "weak reference" means an object that only has a

   * persistant handle.)

   *

   * DO NOT CALL THIS FROM DESTRUCTOR

   */

  virtual void Unref() {

    assert(!persistent().IsEmpty());

    assert(!persistent().IsWeak());

    assert(refs_ > 0);

    if (--refs_ == 0)

      MakeWeak();

  }

  int refs_;  // ro

 private:

  NAN_DISALLOW_ASSIGN_COPY_MOVE(ObjectWrap)

#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \

  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))

  static void

  WeakCallback(v8::WeakCallbackInfo<ObjectWrap> const& info) {

    ObjectWrap* wrap = info.GetParameter();

    assert(wrap->refs_ == 0);

    assert(wrap->handle_.IsNearDeath());

    wrap->handle_.Reset();

    delete wrap;

  }

#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION

  static void

  WeakCallback(v8::WeakCallbackData<v8::Object, ObjectWrap> const& data) {

    ObjectWrap* wrap = data.GetParameter();

    assert(wrap->refs_ == 0);

    assert(wrap->handle_.IsNearDeath());

    wrap->handle_.Reset();

    delete wrap;

  }

#else

  static void WeakCallback(v8::Persistent<v8::Value> value, void *data) {

    ObjectWrap *wrap = static_cast<ObjectWrap*>(data);

    assert(wrap->refs_ == 0);

    assert(wrap->handle_.IsNearDeath());

    wrap->handle_.Reset();

    delete wrap;

  }

#endif

  Persistent<v8::Object> handle_;

};

#endif  // NAN_OBJECT_WRAP_H_