text: // Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
  // Distributed under the MIT License (http://opensource.org/licenses/MIT)
  
  #pragma once
  
  #ifndef SPDLOG_HEADER_ONLY
  #include "../sinks/wincolor_sink.h"
  #endif
  
  #include "../details/windows_include.h"
  #include <wincon.h>
  
  #include "../common.h"
  #include "../pattern_formatter.h"
  
  namespace spdlog {
  namespace sinks {
  template<typename ConsoleMutex>
  SPDLOG_INLINE wincolor_sink<ConsoleMutex>::wincolor_sink(void *out_handle, color_mode mode)
      : out_handle_(out_handle)
      , mutex_(ConsoleMutex::mutex())
      , formatter_(details::make_unique<spdlog::pattern_formatter>())
  {
  
      set_color_mode_impl(mode);
      // set level colors
      colors_[level::trace] = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;     // white
      colors_[level::debug] = FOREGROUND_GREEN | FOREGROUND_BLUE;                      // cyan
      colors_[level::info] = FOREGROUND_GREEN;                                         // green
      colors_[level::warn] = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_INTENSITY; // intense yellow
      colors_[level::err] = FOREGROUND_RED | FOREGROUND_INTENSITY;                     // intense red
      colors_[level::critical] =
          BACKGROUND_RED | FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY; // intense white on red background
      colors_[level::off] = 0;
  }
  
  template<typename ConsoleMutex>
  SPDLOG_INLINE wincolor_sink<ConsoleMutex>::~wincolor_sink()
  {
      this->flush();
  }
  
  // change the color for the given level
  template<typename ConsoleMutex>
  void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color(level::level_enum level, std::uint16_t color)
  {
      std::lock_guard<mutex_t> lock(mutex_);
      colors_[level] = color;
  }
  
  template<typename ConsoleMutex>
  void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::log(const details::log_msg &msg)
  {
      if (out_handle_ == nullptr || out_handle_ == INVALID_HANDLE_VALUE)
      {
          return;
      }
  
      std::lock_guard<mutex_t> lock(mutex_);
      msg.color_range_start = 0;
      msg.color_range_end = 0;
      memory_buf_t formatted;
      formatter_->format(msg, formatted);
      if (should_do_colors_ && msg.color_range_end > msg.color_range_start)
      {
          // before color range
          print_range_(formatted, 0, msg.color_range_start);
          // in color range
          auto orig_attribs = static_cast<WORD>(set_foreground_color_(colors_[msg.level]));
          print_range_(formatted, msg.color_range_start, msg.color_range_end);
          // reset to orig colors
          ::SetConsoleTextAttribute(static_cast<HANDLE>(out_handle_), orig_attribs);
          print_range_(formatted, msg.color_range_end, formatted.size());
      }
      else // print without colors if color range is invalid (or color is disabled)
      {
          write_to_file_(formatted);
      }
  }
  
  template<typename ConsoleMutex>
  void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::flush()
  {
      // windows console always flushed?
  }
  
  template<typename ConsoleMutex>
  void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_pattern(const std::string &pattern)
  {
      std::lock_guard<mutex_t> lock(mutex_);
      formatter_ = std::unique_ptr<spdlog::formatter>(new pattern_formatter(pattern));
  }
  
  template<typename ConsoleMutex>
  void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_formatter(std::unique_ptr<spdlog::formatter> sink_formatter)
  {
      std::lock_guard<mutex_t> lock(mutex_);
      formatter_ = std::move(sink_formatter);
  }
  
  template<typename ConsoleMutex>
  void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color_mode(color_mode mode)
  {
      std::lock_guard<mutex_t> lock(mutex_);
      set_color_mode_impl(mode);
  }
  
  template<typename ConsoleMutex>
  void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color_mode_impl(color_mode mode)
  {
      if (mode == color_mode::automatic)
      {
          // should do colors only if out_handle_  points to actual console.
          DWORD console_mode;
          bool in_console = ::GetConsoleMode(static_cast<HANDLE>(out_handle_), &console_mode) != 0;
          should_do_colors_ = in_console;
      }
      else
      {
          should_do_colors_ = mode == color_mode::always ? true : false;
      }
  }
  
  // set foreground color and return the orig console attributes (for resetting later)
  template<typename ConsoleMutex>
  std::uint16_t SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_foreground_color_(std::uint16_t attribs)
  {
      CONSOLE_SCREEN_BUFFER_INFO orig_buffer_info;
      if (!::GetConsoleScreenBufferInfo(static_cast<HANDLE>(out_handle_), &orig_buffer_info))
      {
          // just return white if failed getting console info
          return FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE; 
      }
      
      // change only the foreground bits (lowest 4 bits) 
      auto new_attribs = static_cast<WORD>(attribs) | (orig_buffer_info.wAttributes & 0xfff0);
      auto ignored = ::SetConsoleTextAttribute(static_cast<HANDLE>(out_handle_), static_cast<WORD>(new_attribs));
      (void)(ignored);
      return static_cast<std::uint16_t>(orig_buffer_info.wAttributes); // return orig attribs
  }
  
  // print a range of formatted message to console
  template<typename ConsoleMutex>
  void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::print_range_(const memory_buf_t &formatted, size_t start, size_t end)
  {
      if (end > start)
      {
          auto size = static_cast<DWORD>(end - start);
          auto ignored = ::WriteConsoleA(static_cast<HANDLE>(out_handle_), formatted.data() + start, size, nullptr, nullptr);
          (void)(ignored);
      }
  }
  
  template<typename ConsoleMutex>
  void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::write_to_file_(const memory_buf_t &formatted)
  {
      auto size = static_cast<DWORD>(formatted.size());
      DWORD bytes_written = 0;
      auto ignored = ::WriteFile(static_cast<HANDLE>(out_handle_), formatted.data(), size, &bytes_written, nullptr);
      (void)(ignored);
  }
  
  // wincolor_stdout_sink
  template<typename ConsoleMutex>
  SPDLOG_INLINE wincolor_stdout_sink<ConsoleMutex>::wincolor_stdout_sink(color_mode mode)
      : wincolor_sink<ConsoleMutex>(::GetStdHandle(STD_OUTPUT_HANDLE), mode)
  {}
  
  // wincolor_stderr_sink
  template<typename ConsoleMutex>
  SPDLOG_INLINE wincolor_stderr_sink<ConsoleMutex>::wincolor_stderr_sink(color_mode mode)
      : wincolor_sink<ConsoleMutex>(::GetStdHandle(STD_ERROR_HANDLE), mode)
  {}
  } // namespace sinks
  } // namespace spdlog
  