openrw/rwengine/include/core/Logger.hpp

#pragma once

#include <string>
#include <vector>

/**
 * Handles and stores messages from different components
 * 
 * Dispatches recieved messages to logger outputs.
 */
class Logger
{
public:
	enum MessageSeverity
	{
		Verbose,
		Info,
		Warning,
		Error
	};

	struct LogMessage
	{
		/// The component that produced the message
		std::string component;
		/// Severity of the message.
		MessageSeverity severity;
		/// Logged message
		std::string message;
		
		LogMessage(const std::string& cc,
		           MessageSeverity ss,
		           const std::string& mm)
		: component(cc), severity(ss), message(mm) { }
	};

	/**
	 * Interface for handling logged messages.
	 * 
	 * The Logger class will not clean up allocated MessageRecievers.
	 */
	struct MessageReciever
	{
		virtual void messageRecieved(const LogMessage&) = 0;
	};
	
	void addReciever(MessageReciever* out);
	void removeReciever(MessageReciever* out);
	
	void log(const std::string& component, Logger::MessageSeverity severity, const std::string& message);
	
	void verbose(const std::string& component, const std::string& message);
	void info(const std::string& component, const std::string& message);
	void warning(const std::string& component, const std::string& message);
	void error(const std::string& component, const std::string& message);
private:
	std::vector<MessageReciever*> recievers;
};

class StdOutReciever : public Logger::MessageReciever
{
    virtual void messageRecieved(const Logger::LogMessage&);
};