// Copyright 2017 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>

#include <iostream>
#include <sstream>
#include <string>

#include "src/main/cpp/util/errors.h"

namespace blaze_util {

using std::string;
using std::stringstream;

string GetLastErrorString() {
  DWORD last_error = ::GetLastError();
  if (last_error == 0) {
    return "success";
  }

  char* message_buffer = nullptr;
  DWORD size = FormatMessageA(
      FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
          FORMAT_MESSAGE_IGNORE_INSERTS,
      nullptr, last_error, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
      (LPSTR)&message_buffer, 0, nullptr);

  DWORD format_message_error = ::GetLastError();

  stringstream result;
  if (size == 0 || message_buffer == nullptr) {
    result << "(error: 0x" << std::hex << last_error
           << "): <FormatMessageA failed: 0x" << format_message_error << ">";
  } else {
    result << "(error: " << last_error << "): " << message_buffer;
  }
  LocalFree(message_buffer);
  return result.str();
}

}  // namespace blaze_util