/**

 * 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();

}

}

}