//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2024
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/Status.h"

#include "td/utils/SliceBuilder.h"

#if TD_PORT_WINDOWS
#include "td/utils/port/wstring_convert.h"
#endif

#if TD_PORT_POSIX
#include "td/utils/port/thread_local.h"

#include <string.h>

#include <cstring>
#endif

namespace td {

#if TD_PORT_POSIX
CSlice strerror_safe(int code) {
  const size_t size = 1000;

  static TD_THREAD_LOCAL char *buf;
  init_thread_local<char[]>(buf, size);

#if !defined(__GLIBC__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE)
  strerror_r(code, buf, size);
  return CSlice(buf, buf + std::strlen(buf));
#else
  return CSlice(strerror_r(code, buf, size));
#endif
}
#endif

#if TD_PORT_WINDOWS
string winerror_to_string(int code) {
  const size_t size = 1000;
  wchar_t wbuf[size];
  auto res_size = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, code, 0, wbuf, size - 1, nullptr);
  if (res_size == 0) {
    return "Unknown Windows error";
  }
  while (res_size != 0 && (wbuf[res_size - 1] == '\n' || wbuf[res_size - 1] == '\r')) {
    res_size--;
  }
  auto error_message = from_wstring(wbuf, res_size);
  if (error_message.is_error()) {
    return "Invalid Windows error";
  }
  return error_message.move_as_ok();
}
#endif

Status Status::move_as_error_prefix(Slice prefix) const {
  CHECK(is_error());
  return move_as_error_prefix_unsafe(prefix);
}

Status Status::move_as_error_prefix_unsafe(Slice prefix) const {
  Info info = get_info();
  switch (info.error_type) {
    case ErrorType::General:
      return Error(code(), PSLICE() << prefix << message());
    case ErrorType::Os:
      return Status(false, ErrorType::Os, code(), PSLICE() << prefix << message());
    default:
      UNREACHABLE();
      return {};
  }
}

Status Status::move_as_error_suffix(Slice suffix) const {
  CHECK(is_error());
  return move_as_error_suffix_unsafe(suffix);
}

Status Status::move_as_error_suffix_unsafe(Slice suffix) const {
  Info info = get_info();
  switch (info.error_type) {
    case ErrorType::General:
      return Error(code(), PSLICE() << message() << suffix);
    case ErrorType::Os:
      return Status(false, ErrorType::Os, code(), PSLICE() << message() << suffix);
    default:
      UNREACHABLE();
      return {};
  }
}

}  // namespace td