#pragma once

#include <sstream> // std::stringstream (buffer for log entries)
#include <string>

#ifndef LOG_USEMUTEX
#define LOG_USEMUTEX 0
#endif

namespace Log {
enum Level { OFF = 0, FATAL, ERROR, WARN, NOTE, INFO, DEBUG, TRACE };

// set up the logger with a ConsoleOutput
void init();
// close all output streams
void stop();

void addLogfile(const std::string& filename, Level max);
void addLogfile(const std::string& filename, Level min, Level max);

void setConsoleLogLevel(Level lvl);
void setColoredOutput(bool enabled);

// Log entry that can be formed with various mixed data types
// by concatenation with the << operator
// Inspired from https://stackoverflow.com/a/8337882
class Entry {
private:
	std::stringstream ss;
	Level lvl;

	void addMetadataHeader();

public:
	Entry(Level lvl);
	Entry(Entry&&) = default;
	~Entry();

	template <typename T> Entry& operator<<(const T& msg) {
		ss << msg;
		return *this;
	}
};

class LeveledSink {
private:
	Level level;

public:
	LeveledSink(Level level);

	template <typename T> Entry operator<<(const T& msg) {
		Entry entry(level);
		entry << msg;
		return entry;
	}
};

// LeveledSinks
extern LeveledSink fatal;
extern LeveledSink error;
extern LeveledSink warn;
extern LeveledSink note;
extern LeveledSink info;
extern LeveledSink debug;
extern LeveledSink trace;

} // namespace Log