File logging.h

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#pragma once

#include <chrono>
#include <format>
#include <iostream>
#include <string_view>

namespace tguf::detail {

enum class LogLevel {
  DEBUG,
  INFO,
  WARN,
  ERROR,
};

inline void log_impl(LogLevel level, std::string_view file, int line,
                     std::string_view msg) {
  std::string_view prefix{};

  switch (level) {
    case LogLevel::DEBUG:
      prefix = "[DEBUG]";
      break;
    case LogLevel::WARN:
      prefix = "[WARN ]";
      break;
    case LogLevel::ERROR:
      prefix = "[ERR  ]";
      break;
    case LogLevel::INFO:
    default:  // Default to INFO
      prefix = "[INFO ]";
      break;
  }

  const auto now = std::chrono::floor<std::chrono::milliseconds>(
      std::chrono::system_clock::now());
  const auto pos = file.find_last_of("/\\");
  const auto short_file =
      (pos == std::string_view::npos) ? file : file.substr(pos + 1);
  const auto loc = std::format("{}:{}", short_file, line);
  std::cerr << std::format("{} {:%H:%M:%S} [{:<17}] {}\n", prefix, now, loc,
                           msg);
}

}  // namespace tguf::detail

#ifndef NDEBUG
#define TGUF_LOG_DEBUG(...)                                                 \
  tguf::detail::log_impl(tguf::detail::LogLevel::DEBUG, __FILE__, __LINE__, \
                         std::format(__VA_ARGS__))
#else
#define TGUF_LOG_DEBUG(...) ((void)0)
#endif

#define TGUF_LOG_INFO(msg, ...)                                            \
  tguf::detail::log_impl(tguf::detail::LogLevel::INFO, __FILE__, __LINE__, \
                         std::format(msg __VA_OPT__(, ) __VA_ARGS__))

#define TGUF_LOG_WARN(msg, ...)                                            \
  tguf::detail::log_impl(tguf::detail::LogLevel::WARN, __FILE__, __LINE__, \
                         std::format(msg __VA_OPT__(, ) __VA_ARGS__))

#define TGUF_LOG_ERROR(msg, ...)                                            \
  tguf::detail::log_impl(tguf::detail::LogLevel::ERROR, __FILE__, __LINE__, \
                         std::format(msg __VA_OPT__(, ) __VA_ARGS__))