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 // SPDX-License-Identifier: MPL-2.0
 //
 // Copyright (C) 2016-2018 CERN for the benefit of the Acts project
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 //
 // Based on code from Acts at Core/include/Acts/Utilities/Logger.hpp
 //
 
 #pragma once
 
 #include <boost/assign.hpp>
 #include <boost/bimap.hpp>
 
 #include <regex>
 
 #include <spdlog/spdlog.h>
 #include <spdlog/fmt/fmt.h>
 
 #include <Acts/Utilities/Logger.hpp>
 #include <JANA/JException.h>
 
 namespace eicrecon {
 
 using namespace Acts::Logging;
 
 using SpdlogToActsLevel_t = boost::bimap<spdlog::level::level_enum, Acts::Logging::Level>;
 static SpdlogToActsLevel_t kSpdlogToActsLevel = boost::assign::list_of<SpdlogToActsLevel_t::relation>
   (spdlog::level::trace, Acts::Logging::VERBOSE)
   (spdlog::level::debug, Acts::Logging::DEBUG)
   (spdlog::level::info, Acts::Logging::INFO)
   (spdlog::level::warn, Acts::Logging::WARNING)
   (spdlog::level::err, Acts::Logging::ERROR)
   (spdlog::level::critical, Acts::Logging::FATAL);
 
 inline Acts::Logging::Level SpdlogToActsLevel(spdlog::level::level_enum input) {
   try {
     return kSpdlogToActsLevel.left.at(input);
   } catch (...) {
     auto err_msg = fmt::format("SpdlogToActsLevel don't know this log level: '{}'", fmt::underlying(input));
     throw JException(err_msg);
   }
 }
 
 inline spdlog::level::level_enum ActsToSpdlogLevel(Acts::Logging::Level input) {
   try {
     return kSpdlogToActsLevel.right.at(input);
   } catch (...) {
     auto err_msg = fmt::format("ActsToSpdlogLevel don't know this log level: '{}'", fmt::underlying(input));
     throw JException(err_msg);
   }
 }
 
 /// @brief default print policy for debug messages
 ///
 /// This class allows to print debug messages without further modifications to
 /// a specified output stream.
 class SpdlogPrintPolicy final : public Acts::Logging::OutputPrintPolicy {
   public:
     /// @brief constructor
     ///
     /// @param [in] out pointer to output stream object
     ///
     /// @pre @p out is non-zero
     explicit SpdlogPrintPolicy(std::shared_ptr<spdlog::logger> out, std::vector<std::string> suppressions = {})
     : m_out(out) {
       std::transform(suppressions.begin(), suppressions.end(), std::back_inserter(m_suppressions),
         [](const std::string& supp_string) {
           return std::make_tuple(supp_string, std::regex(supp_string), 0, Acts::Logging::INFO);
         }
       );
     }
 
     /// @brief destructor
     ~SpdlogPrintPolicy() {
       for (const auto& [supp_string, supp_regex, supp_count, supp_level] : m_suppressions) {
         if (supp_count > 0) {
           m_out->log(ActsToSpdlogLevel(supp_level), "\"{}\" suppressed {} times", supp_string, supp_count);
         }
       }
     }
 
     /// @brief flush the debug message to the destination stream
     ///
     /// @param [in] lvl   debug level of debug message
     /// @param [in] input text of debug message
     void flush(const Level& lvl, const std::string& input) final {
       for (auto& [supp_string, supp_regex, supp_count, supp_level] : m_suppressions) {
         if (std::regex_search(input, supp_regex)) {
           supp_count++;
           supp_level = std::max(lvl, supp_level);
           return;
         }
       }
       m_out->log(ActsToSpdlogLevel(lvl), input);
       if (lvl >= getFailureThreshold()) {
         throw ThresholdFailure(
             "Previous debug message exceeds the "
             "ACTS_LOG_FAILURE_THRESHOLD=" +
             std::string{levelName(getFailureThreshold())} +
             " configuration, bailing out. See "
             "https://acts.readthedocs.io/en/latest/core/"
             "logging.html#logging-thresholds");
       }
     }
 
     /// Fulfill @c OutputPrintPolicy interface. This policy doesn't actually have a
     /// name, so the assumption is that somewhere in the decorator hierarchy,
     /// there is something that returns a name without delegating to a wrappee,
     /// before reaching this overload.
     /// @note This method will throw an exception
     /// @return the name, but it never returns
     const std::string& name() const override {
       throw std::runtime_error{
           "Default print policy doesn't have a name. Is there no named output in "
           "the decorator chain?"};
     };
 
     /// Make a copy of this print policy with a new name
     /// @param name the new name
     /// @return the copy
     std::unique_ptr<OutputPrintPolicy> clone(
         const std::string& name) const override {
       (void)name;
       return std::make_unique<SpdlogPrintPolicy>(m_out);
     };
 
   private:
     /// pointer to destination output stream
     std::shared_ptr<spdlog::logger> m_out;
 
     /// regexes for messages to be suppressed
     std::vector<std::tuple<std::string, std::regex, std::size_t, Acts::Logging::Level>> m_suppressions;
 };
 
 inline std::unique_ptr<const Acts::Logger> getSpdlogLogger(
     const std::string& name,
     std::shared_ptr<spdlog::logger> log,
     std::vector<std::string> suppressions = {}) {
 
   const Acts::Logging::Level lvl = SpdlogToActsLevel(log->level());
   auto output = std::make_unique<Acts::Logging::NamedOutputDecorator>(
       std::make_unique<SpdlogPrintPolicy>(log, suppressions),
       name);
   auto print = std::make_unique<DefaultFilterPolicy>(lvl);
   return std::make_unique<const Acts::Logger>(std::move(output), std::move(print));
 }
 
 
 } // eicrecon

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