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/**
 *  @file
 *  @author     2016 Stefan Radomski (stefan.radomski@cs.tu-darmstadt.de)
 *  @copyright  Simplified BSD
 *
 *  @cond
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the FreeBSD license as published by the FreeBSD
 *  project.
 *
 *  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.
 *
 *  You should have received a copy of the FreeBSD license along with this
 *  program. If not, see <http://www.opensource.org/licenses/bsd-license>.
 *  @endcond
 */

#ifndef LOGGING_H_3B1A3A0F
#define LOGGING_H_3B1A3A0F

#include "uscxml/config.h"
#include "uscxml/Common.h"

#include "uscxml/messages/Data.h"
#include "uscxml/messages/Event.h"

#include <memory>

#define LOG(lvl) uscxml::Logger::getDefault().log(lvl)
#define LOG2(lvl, thing) uscxml::Logger::getDefault().log(lvl, thing);

#define SCXML   USCXML_SCXML
#define TRACE   USCXML_TRACE
#define DEBUG   USCXML_DEBUG
#define INFO    USCXML_INFO
#define WARNING USCXML_WARN
#define ERROR   USCXML_ERROR
#define FATAL   USCXML_FATAL

namespace uscxml {

enum LogSeverity {
    USCXML_SCXML,
    USCXML_TRACE,
	USCXML_DEBUG,
	USCXML_INFO,
	USCXML_WARN,
	USCXML_ERROR,
	USCXML_FATAL
};

class LoggerImpl;

void log(LogSeverity severity, const Event& event);
void log(LogSeverity severity, const Data& data);

class StreamLogger {
public:
    std::ostream& operator<<(const std::string& message);
    ~StreamLogger();

protected:
    StreamLogger(LogSeverity severity, std::shared_ptr<LoggerImpl> logger) : _severity(severity), _logger(logger) {}
    StreamLogger(const StreamLogger& other) : _severity(other._severity), _logger(other._logger) {}
    
    LogSeverity _severity;
    std::shared_ptr<LoggerImpl> _logger;
    std::stringstream ss;
    
    friend class Logger;
};

class USCXML_API Logger {
public:
    PIMPL_OPERATORS(Logger);
    
	virtual void log(LogSeverity severity, const Event& event);
    virtual void log(LogSeverity severity, const Data& data);
    virtual void log(LogSeverity severity, const std::string& message);
    
    virtual StreamLogger log(LogSeverity severity);
    static std::string severityToString(LogSeverity severity);
    
    static Logger getDefault();
    
	std::shared_ptr<LoggerImpl> getImpl() const;
protected:
	std::shared_ptr<LoggerImpl> _impl;
	
};

}

#endif /* end of include guard: LOGGING_H_3B1A3A0F */