// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___FILESYSTEM_U8PATH_H
#define _LIBCPP___FILESYSTEM_U8PATH_H

#include <__algorithm/unwrap_iter.h>
#include <__config>
#include <__filesystem/path.h>
#include <string>

// Only required on Windows for __widen_from_utf8, and included conservatively
// because it requires support for localization.
#if defined(_LIBCPP_WIN32API)
#  include <locale>
#endif

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

#if _LIBCPP_STD_VER >= 17

_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM

_LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_PUSH

template <class _InputIt, __enable_if_t<__is_pathable<_InputIt>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_DEPRECATED_WITH_CHAR8_T path u8path(_InputIt __f, _InputIt __l) {
  static_assert(
#  if _LIBCPP_HAS_CHAR8_T
      is_same<typename __is_pathable<_InputIt>::__char_type, char8_t>::value ||
#  endif
          is_same<typename __is_pathable<_InputIt>::__char_type, char>::value,
      "u8path(Iter, Iter) requires Iter have a value_type of type 'char'"
      " or 'char8_t'");
#  if defined(_LIBCPP_WIN32API)
  string __tmp(__f, __l);
  using _CVT = __widen_from_utf8<sizeof(wchar_t) * __CHAR_BIT__>;
  std::wstring __w;
  __w.reserve(__tmp.size());
  _CVT()(back_inserter(__w), __tmp.data(), __tmp.data() + __tmp.size());
  return path(__w);
#  else
  return path(__f, __l);
#  endif /* !_LIBCPP_WIN32API */
}

#  if defined(_LIBCPP_WIN32API)
template <class _InputIt, __enable_if_t<__is_pathable<_InputIt>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_DEPRECATED_WITH_CHAR8_T path u8path(_InputIt __f, _NullSentinel) {
  static_assert(
#    if _LIBCPP_HAS_CHAR8_T
      is_same<typename __is_pathable<_InputIt>::__char_type, char8_t>::value ||
#    endif
          is_same<typename __is_pathable<_InputIt>::__char_type, char>::value,
      "u8path(Iter, Iter) requires Iter have a value_type of type 'char'"
      " or 'char8_t'");
  string __tmp;
  const char __sentinel = char{};
  for (; *__f != __sentinel; ++__f)
    __tmp.push_back(*__f);
  using _CVT = __widen_from_utf8<sizeof(wchar_t) * __CHAR_BIT__>;
  std::wstring __w;
  __w.reserve(__tmp.size());
  _CVT()(back_inserter(__w), __tmp.data(), __tmp.data() + __tmp.size());
  return path(__w);
}
#  endif /* _LIBCPP_WIN32API */

template <class _Source, __enable_if_t<__is_pathable<_Source>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_DEPRECATED_WITH_CHAR8_T path u8path(const _Source& __s) {
  static_assert(
#  if _LIBCPP_HAS_CHAR8_T
      is_same<typename __is_pathable<_Source>::__char_type, char8_t>::value ||
#  endif
          is_same<typename __is_pathable<_Source>::__char_type, char>::value,
      "u8path(Source const&) requires Source have a character type of type "
      "'char' or 'char8_t'");
#  if defined(_LIBCPP_WIN32API)
  using _Traits = __is_pathable<_Source>;
  return u8path(std::__unwrap_iter(_Traits::__range_begin(__s)), std::__unwrap_iter(_Traits::__range_end(__s)));
#  else
  return path(__s);
#  endif
}

_LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_POP

_LIBCPP_END_NAMESPACE_FILESYSTEM

#endif // _LIBCPP_STD_VER >= 17

#endif // _LIBCPP___FILESYSTEM_U8PATH_H