/*
  Copyright 2019-2021 David Robillard <d@drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#ifndef SERD_DETAIL_WRAPPER_HPP
#define SERD_DETAIL_WRAPPER_HPP

// IWYU pragma: no_include "serd/serd.h"

#include <cstddef>
#include <memory>
#include <type_traits>
#include <utility>

namespace serd {

/// Utility template for a mutable type which removes const if necessary
template<class T>
class Optional;

/// Detail namespace
namespace detail {

/**
   @defgroup serdpp_detail Serd C++ API details
   Internal C++ wrapper details that should not be used directly by clients.
   @ingroup serdpp
   @{
*/

/// Utility template for a mutable type which removes const if necessary
template<class T>
using Mutable = typename std::remove_const_t<T>;

/// Generic C++ wrapper for a C object
template<class T, class Deleter>
class Wrapper
{
public:
  using CType = T;

  explicit Wrapper(T* ptr)
    : _ptr{ptr, Deleter{}}
  {}

  Wrapper(T* ptr, Deleter deleter)
    : _ptr{ptr, std::move(deleter)}
  {}

  explicit Wrapper(std::unique_ptr<T, Deleter> ptr)
    : _ptr{std::move(ptr)}
  {}

  Wrapper(Wrapper&&) noexcept = default;
  Wrapper& operator=(Wrapper&&) noexcept = default;

  Wrapper(const Wrapper&) = delete;
  Wrapper& operator=(const Wrapper&) = delete;

  ~Wrapper() = default;

  /// Return a pointer to the underlying C object
  T* cobj() { return _ptr.get(); }

  /// Return a pointer to the underlying C object
  const T* cobj() const { return _ptr.get(); }

protected:
  friend class Optional<T>;

  explicit Wrapper(std::nullptr_t)
    : _ptr{nullptr}
  {}

  void reset() { _ptr.reset(); }

  std::unique_ptr<T, Deleter> _ptr;
};

/**
   @}
*/

} // namespace detail
} // namespace serd

#endif // SERD_DETAIL_WRAPPER_HPP