#ifndef OBJECT_INFO_HPP
#define OBJECT_INFO_HPP

#include "matador/object/basic_object_info.hpp"
#include "matador/object/observer.hpp"

#include <functional>

namespace matador::object {
class repository_node;

template<typename Type>
class observer_ptr {
public:
  explicit observer_ptr(std::unique_ptr<observer<Type>> &&observer)
  : observer(std::move(observer)) {}

  operator bool() const { return observer != nullptr; }

  observer<Type> *get() const { return observer.get(); }
  observer<Type> &operator*() const { return *observer; }
  observer<Type> *operator->() const { return observer.get(); }

private:
  std::unique_ptr<observer<Type>> observer;
};
template<typename Type>
class object_info final : public basic_object_info {
public:
  using create_func = std::function<std::unique_ptr<Type>()>;

  object_info(const std::shared_ptr<repository_node>& node,
              std::shared_ptr<class object> &&obj,
              create_func&& creator)
  : basic_object_info(node, std::move(obj))
  , creator_(std::move(creator)){
  }

  explicit object_info(const std::shared_ptr<repository_node>& node)
  : basic_object_info(node, {}) {
  }

  const Type &prototype() const { return prototype_; }
  std::unique_ptr<Type> create() const { return creator_(); }

  void on_attach() const override {
    for (auto &observer : observers_) {
      observer->on_attach(*node_, prototype_);
    }
  }

  void on_detach() const override {
    for (auto &observer : observers_) {
      observer->on_detach(*node_, prototype_);
    }
  }

  void register_observer(observer_ptr<Type> observer) {
    observers_.push_back(std::move(observer));
  }
private:
  Type prototype_;
  create_func creator_{[]{ return std::make_unique<Type>(); }};
  std::vector<observer_ptr<Type>> observers_;
};

template<typename Type>
using object_info_ref = std::reference_wrapper<const object_info<Type>>;

namespace detail {
struct null_type {};
}

using null_info = object_info<detail::null_type>;
}

#endif //OBJECT_INFO_HPP