// -*- 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_DIRECTORY_ENTRY_H
#define _LIBCPP___FILESYSTEM_DIRECTORY_ENTRY_H

#include <__availability>
#include <__config>
#include <__errc>
#include <__filesystem/file_status.h>
#include <__filesystem/file_time_type.h>
#include <__filesystem/file_type.h>
#include <__filesystem/filesystem_error.h>
#include <__filesystem/operations.h>
#include <__filesystem/path.h>
#include <__filesystem/perms.h>
#include <chrono>
#include <cstdint>
#include <cstdlib>
#include <iosfwd>
#include <system_error>

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

#ifndef _LIBCPP_CXX03_LANG

_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM

_LIBCPP_AVAILABILITY_FILESYSTEM_PUSH


class directory_entry {
  typedef _VSTD_FS::path _Path;

public:
  // constructors and destructors
  directory_entry() noexcept = default;
  directory_entry(directory_entry const&) = default;
  directory_entry(directory_entry&&) noexcept = default;

  _LIBCPP_INLINE_VISIBILITY
  explicit directory_entry(_Path const& __p) : __p_(__p) {
    error_code __ec;
    __refresh(&__ec);
  }

  _LIBCPP_INLINE_VISIBILITY
  directory_entry(_Path const& __p, error_code& __ec) : __p_(__p) {
    __refresh(&__ec);
  }

  ~directory_entry() {}

  directory_entry& operator=(directory_entry const&) = default;
  directory_entry& operator=(directory_entry&&) noexcept = default;

  _LIBCPP_INLINE_VISIBILITY
  void assign(_Path const& __p) {
    __p_ = __p;
    error_code __ec;
    __refresh(&__ec);
  }

  _LIBCPP_INLINE_VISIBILITY
  void assign(_Path const& __p, error_code& __ec) {
    __p_ = __p;
    __refresh(&__ec);
  }

  _LIBCPP_INLINE_VISIBILITY
  void replace_filename(_Path const& __p) {
    __p_.replace_filename(__p);
    error_code __ec;
    __refresh(&__ec);
  }

  _LIBCPP_INLINE_VISIBILITY
  void replace_filename(_Path const& __p, error_code& __ec) {
    __p_ = __p_.parent_path() / __p;
    __refresh(&__ec);
  }

  _LIBCPP_INLINE_VISIBILITY
  void refresh() { __refresh(); }

  _LIBCPP_INLINE_VISIBILITY
  void refresh(error_code& __ec) noexcept { __refresh(&__ec); }

  _LIBCPP_INLINE_VISIBILITY
  _Path const& path() const noexcept { return __p_; }

  _LIBCPP_INLINE_VISIBILITY
  operator const _Path&() const noexcept { return __p_; }

  _LIBCPP_INLINE_VISIBILITY
  bool exists() const { return _VSTD_FS::exists(file_status{__get_ft()}); }

  _LIBCPP_INLINE_VISIBILITY
  bool exists(error_code& __ec) const noexcept {
    return _VSTD_FS::exists(file_status{__get_ft(&__ec)});
  }

  _LIBCPP_INLINE_VISIBILITY
  bool is_block_file() const { return __get_ft() == file_type::block; }

  _LIBCPP_INLINE_VISIBILITY
  bool is_block_file(error_code& __ec) const noexcept {
    return __get_ft(&__ec) == file_type::block;
  }

  _LIBCPP_INLINE_VISIBILITY
  bool is_character_file() const { return __get_ft() == file_type::character; }

  _LIBCPP_INLINE_VISIBILITY
  bool is_character_file(error_code& __ec) const noexcept {
    return __get_ft(&__ec) == file_type::character;
  }

  _LIBCPP_INLINE_VISIBILITY
  bool is_directory() const { return __get_ft() == file_type::directory; }

  _LIBCPP_INLINE_VISIBILITY
  bool is_directory(error_code& __ec) const noexcept {
    return __get_ft(&__ec) == file_type::directory;
  }

  _LIBCPP_INLINE_VISIBILITY
  bool is_fifo() const { return __get_ft() == file_type::fifo; }

  _LIBCPP_INLINE_VISIBILITY
  bool is_fifo(error_code& __ec) const noexcept {
    return __get_ft(&__ec) == file_type::fifo;
  }

  _LIBCPP_INLINE_VISIBILITY
  bool is_other() const { return _VSTD_FS::is_other(file_status{__get_ft()}); }

  _LIBCPP_INLINE_VISIBILITY
  bool is_other(error_code& __ec) const noexcept {
    return _VSTD_FS::is_other(file_status{__get_ft(&__ec)});
  }

  _LIBCPP_INLINE_VISIBILITY
  bool is_regular_file() const { return __get_ft() == file_type::regular; }

  _LIBCPP_INLINE_VISIBILITY
  bool is_regular_file(error_code& __ec) const noexcept {
    return __get_ft(&__ec) == file_type::regular;
  }

  _LIBCPP_INLINE_VISIBILITY
  bool is_socket() const { return __get_ft() == file_type::socket; }

  _LIBCPP_INLINE_VISIBILITY
  bool is_socket(error_code& __ec) const noexcept {
    return __get_ft(&__ec) == file_type::socket;
  }

  _LIBCPP_INLINE_VISIBILITY
  bool is_symlink() const { return __get_sym_ft() == file_type::symlink; }

  _LIBCPP_INLINE_VISIBILITY
  bool is_symlink(error_code& __ec) const noexcept {
    return __get_sym_ft(&__ec) == file_type::symlink;
  }
  _LIBCPP_INLINE_VISIBILITY
  uintmax_t file_size() const { return __get_size(); }

  _LIBCPP_INLINE_VISIBILITY
  uintmax_t file_size(error_code& __ec) const noexcept {
    return __get_size(&__ec);
  }

  _LIBCPP_INLINE_VISIBILITY
  uintmax_t hard_link_count() const { return __get_nlink(); }

  _LIBCPP_INLINE_VISIBILITY
  uintmax_t hard_link_count(error_code& __ec) const noexcept {
    return __get_nlink(&__ec);
  }

  _LIBCPP_INLINE_VISIBILITY
  file_time_type last_write_time() const { return __get_write_time(); }

  _LIBCPP_INLINE_VISIBILITY
  file_time_type last_write_time(error_code& __ec) const noexcept {
    return __get_write_time(&__ec);
  }

  _LIBCPP_INLINE_VISIBILITY
  file_status status() const { return __get_status(); }

  _LIBCPP_INLINE_VISIBILITY
  file_status status(error_code& __ec) const noexcept {
    return __get_status(&__ec);
  }

  _LIBCPP_INLINE_VISIBILITY
  file_status symlink_status() const { return __get_symlink_status(); }

  _LIBCPP_INLINE_VISIBILITY
  file_status symlink_status(error_code& __ec) const noexcept {
    return __get_symlink_status(&__ec);
  }

  _LIBCPP_INLINE_VISIBILITY
  bool operator<(directory_entry const& __rhs) const noexcept {
    return __p_ < __rhs.__p_;
  }

  _LIBCPP_INLINE_VISIBILITY
  bool operator==(directory_entry const& __rhs) const noexcept {
    return __p_ == __rhs.__p_;
  }

  _LIBCPP_INLINE_VISIBILITY
  bool operator!=(directory_entry const& __rhs) const noexcept {
    return __p_ != __rhs.__p_;
  }

  _LIBCPP_INLINE_VISIBILITY
  bool operator<=(directory_entry const& __rhs) const noexcept {
    return __p_ <= __rhs.__p_;
  }

  _LIBCPP_INLINE_VISIBILITY
  bool operator>(directory_entry const& __rhs) const noexcept {
    return __p_ > __rhs.__p_;
  }

  _LIBCPP_INLINE_VISIBILITY
  bool operator>=(directory_entry const& __rhs) const noexcept {
    return __p_ >= __rhs.__p_;
  }

  template <class _CharT, class _Traits>
  _LIBCPP_INLINE_VISIBILITY
  friend basic_ostream<_CharT, _Traits>& operator<<(basic_ostream<_CharT, _Traits>& __os, const directory_entry& __d) {
    return __os << __d.path();
  }

private:
  friend class directory_iterator;
  friend class recursive_directory_iterator;
  friend class _LIBCPP_HIDDEN __dir_stream;

  enum _CacheType : unsigned char {
    _Empty,
    _IterSymlink,
    _IterNonSymlink,
    _RefreshSymlink,
    _RefreshSymlinkUnresolved,
    _RefreshNonSymlink
  };

  struct __cached_data {
    uintmax_t __size_;
    uintmax_t __nlink_;
    file_time_type __write_time_;
    perms __sym_perms_;
    perms __non_sym_perms_;
    file_type __type_;
    _CacheType __cache_type_;

    _LIBCPP_INLINE_VISIBILITY
    __cached_data() noexcept { __reset(); }

    _LIBCPP_INLINE_VISIBILITY
    void __reset() {
      __cache_type_ = _Empty;
      __type_ = file_type::none;
      __sym_perms_ = __non_sym_perms_ = perms::unknown;
      __size_ = __nlink_ = uintmax_t(-1);
      __write_time_ = file_time_type::min();
    }
  };

  _LIBCPP_INLINE_VISIBILITY
  static __cached_data __create_iter_result(file_type __ft) {
    __cached_data __data;
    __data.__type_ = __ft;
    __data.__cache_type_ = [&]() {
      switch (__ft) {
      case file_type::none:
        return _Empty;
      case file_type::symlink:
        return _IterSymlink;
      default:
        return _IterNonSymlink;
      }
    }();
    return __data;
  }

  _LIBCPP_INLINE_VISIBILITY
  void __assign_iter_entry(_Path&& __p, __cached_data __dt) {
    __p_ = _VSTD::move(__p);
    __data_ = __dt;
  }

  _LIBCPP_FUNC_VIS
  error_code __do_refresh() noexcept;

  _LIBCPP_INLINE_VISIBILITY
  static bool __is_dne_error(error_code const& __ec) {
    if (!__ec)
      return true;
    switch (static_cast<errc>(__ec.value())) {
    case errc::no_such_file_or_directory:
    case errc::not_a_directory:
      return true;
    default:
      return false;
    }
  }

  _LIBCPP_INLINE_VISIBILITY
  void __handle_error(const char* __msg, error_code* __dest_ec,
                      error_code const& __ec, bool __allow_dne = false) const {
    if (__dest_ec) {
      *__dest_ec = __ec;
      return;
    }
    if (__ec && (!__allow_dne || !__is_dne_error(__ec)))
      __throw_filesystem_error(__msg, __p_, __ec);
  }

  _LIBCPP_INLINE_VISIBILITY
  void __refresh(error_code* __ec = nullptr) {
    __handle_error("in directory_entry::refresh", __ec, __do_refresh(),
                   /*allow_dne*/ true);
  }

  _LIBCPP_INLINE_VISIBILITY
  file_type __get_sym_ft(error_code* __ec = nullptr) const {
    switch (__data_.__cache_type_) {
    case _Empty:
      return __symlink_status(__p_, __ec).type();
    case _IterSymlink:
    case _RefreshSymlink:
    case _RefreshSymlinkUnresolved:
      if (__ec)
        __ec->clear();
      return file_type::symlink;
    case _IterNonSymlink:
    case _RefreshNonSymlink:
      file_status __st(__data_.__type_);
      if (__ec && !_VSTD_FS::exists(__st))
        *__ec = make_error_code(errc::no_such_file_or_directory);
      else if (__ec)
        __ec->clear();
      return __data_.__type_;
    }
    _LIBCPP_UNREACHABLE();
  }

  _LIBCPP_INLINE_VISIBILITY
  file_type __get_ft(error_code* __ec = nullptr) const {
    switch (__data_.__cache_type_) {
    case _Empty:
    case _IterSymlink:
    case _RefreshSymlinkUnresolved:
      return __status(__p_, __ec).type();
    case _IterNonSymlink:
    case _RefreshNonSymlink:
    case _RefreshSymlink: {
      file_status __st(__data_.__type_);
      if (__ec && !_VSTD_FS::exists(__st))
        *__ec = make_error_code(errc::no_such_file_or_directory);
      else if (__ec)
        __ec->clear();
      return __data_.__type_;
    }
    }
    _LIBCPP_UNREACHABLE();
  }

  _LIBCPP_INLINE_VISIBILITY
  file_status __get_status(error_code* __ec = nullptr) const {
    switch (__data_.__cache_type_) {
    case _Empty:
    case _IterNonSymlink:
    case _IterSymlink:
    case _RefreshSymlinkUnresolved:
      return __status(__p_, __ec);
    case _RefreshNonSymlink:
    case _RefreshSymlink:
      return file_status(__get_ft(__ec), __data_.__non_sym_perms_);
    }
    _LIBCPP_UNREACHABLE();
  }

  _LIBCPP_INLINE_VISIBILITY
  file_status __get_symlink_status(error_code* __ec = nullptr) const {
    switch (__data_.__cache_type_) {
    case _Empty:
    case _IterNonSymlink:
    case _IterSymlink:
      return __symlink_status(__p_, __ec);
    case _RefreshNonSymlink:
      return file_status(__get_sym_ft(__ec), __data_.__non_sym_perms_);
    case _RefreshSymlink:
    case _RefreshSymlinkUnresolved:
      return file_status(__get_sym_ft(__ec), __data_.__sym_perms_);
    }
    _LIBCPP_UNREACHABLE();
  }

  _LIBCPP_INLINE_VISIBILITY
  uintmax_t __get_size(error_code* __ec = nullptr) const {
    switch (__data_.__cache_type_) {
    case _Empty:
    case _IterNonSymlink:
    case _IterSymlink:
    case _RefreshSymlinkUnresolved:
      return _VSTD_FS::__file_size(__p_, __ec);
    case _RefreshSymlink:
    case _RefreshNonSymlink: {
      error_code __m_ec;
      file_status __st(__get_ft(&__m_ec));
      __handle_error("in directory_entry::file_size", __ec, __m_ec);
      if (_VSTD_FS::exists(__st) && !_VSTD_FS::is_regular_file(__st)) {
        errc __err_kind = _VSTD_FS::is_directory(__st) ? errc::is_a_directory
                                                       : errc::not_supported;
        __handle_error("in directory_entry::file_size", __ec,
                       make_error_code(__err_kind));
      }
      return __data_.__size_;
    }
    }
    _LIBCPP_UNREACHABLE();
  }

  _LIBCPP_INLINE_VISIBILITY
  uintmax_t __get_nlink(error_code* __ec = nullptr) const {
    switch (__data_.__cache_type_) {
    case _Empty:
    case _IterNonSymlink:
    case _IterSymlink:
    case _RefreshSymlinkUnresolved:
      return _VSTD_FS::__hard_link_count(__p_, __ec);
    case _RefreshSymlink:
    case _RefreshNonSymlink: {
      error_code __m_ec;
      (void)__get_ft(&__m_ec);
      __handle_error("in directory_entry::hard_link_count", __ec, __m_ec);
      return __data_.__nlink_;
    }
    }
    _LIBCPP_UNREACHABLE();
  }

  _LIBCPP_INLINE_VISIBILITY
  file_time_type __get_write_time(error_code* __ec = nullptr) const {
    switch (__data_.__cache_type_) {
    case _Empty:
    case _IterNonSymlink:
    case _IterSymlink:
    case _RefreshSymlinkUnresolved:
      return _VSTD_FS::__last_write_time(__p_, __ec);
    case _RefreshSymlink:
    case _RefreshNonSymlink: {
      error_code __m_ec;
      file_status __st(__get_ft(&__m_ec));
      __handle_error("in directory_entry::last_write_time", __ec, __m_ec);
      if (_VSTD_FS::exists(__st) &&
          __data_.__write_time_ == file_time_type::min())
        __handle_error("in directory_entry::last_write_time", __ec,
                       make_error_code(errc::value_too_large));
      return __data_.__write_time_;
    }
    }
    _LIBCPP_UNREACHABLE();
  }

private:
  _Path __p_;
  __cached_data __data_;
};

class __dir_element_proxy {
public:
  inline _LIBCPP_INLINE_VISIBILITY directory_entry operator*() {
    return _VSTD::move(__elem_);
  }

private:
  friend class directory_iterator;
  friend class recursive_directory_iterator;
  explicit __dir_element_proxy(directory_entry const& __e) : __elem_(__e) {}
  __dir_element_proxy(__dir_element_proxy&& __o)
      : __elem_(_VSTD::move(__o.__elem_)) {}
  directory_entry __elem_;
};

_LIBCPP_AVAILABILITY_FILESYSTEM_POP

_LIBCPP_END_NAMESPACE_FILESYSTEM

#endif // _LIBCPP_CXX03_LANG

_LIBCPP_POP_MACROS

#endif // _LIBCPP___FILESYSTEM_DIRECTORY_ENTRY_H
