/**

  * DJM-Fix

  * Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info)

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, version 3 of the License.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. If not, see <http://www.gnu.org/licenses/>.

  */

 #include <chrono>

 #include <iomanip>

 #include <sstream>

 #include "Logger.h"

 namespace djmfix {

 namespace logging {

 class Blackhole : public Logger {

 public:

 	virtual void log(Level level, const std::string& message) override {

 	}

 };

 class LoggerImpl : public Logger {

 private:

 	std::ostream& output;

 	Level minLevel;

 	std::string getTimestamp() {

 		auto now = std::chrono::system_clock::now();

 		auto itt = std::chrono::system_clock::to_time_t(now);

 		std::ostringstream ss;

 		ss << std::put_time(localtime(&itt), "%FT%T%z");

 		return ss.str();

 	}

 	std::string toString(Level level) {

 		if (level == Level::SEVERE) return "SEVERE";

 		else if (level == Level::WARNING) return "WARNING";

 		else if (level == Level::INFO) return "INFO";

 		else if (level == Level::CONFIG) return "CONFIG";

 		else if (level == Level::FINE) return "FINE";

 		else if (level == Level::FINER) return "FINER";

 		else if (level == Level::FINEST) return "FINEST";

 		else return "UNKNOWN";

 	}

 public:

 	LoggerImpl(std::ostream& output, Level minLevel) : output(output), minLevel(minLevel) {

 	}

 	virtual void log(Level level, const std::string& message) override {

 		if (level <= minLevel) {

 			output << getTimestamp() << " " << std::setw(8) << toString(level) << ":  " << message << std::endl;

 		}

 	}

 };

 Logger* create(std::ostream& output, Level minLevel) {

 	return new LoggerImpl(output, minLevel);

 }

 Logger* blackhole() {

 	return new Blackhole();

 }

 }

 }