/**
 * 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();
}

}
}