/*
 * CLogger.h
 *
 *  Created on: 25 cze 2015
 *      Author: lukasz
 */

#ifndef CLOGGER_H_
#define CLOGGER_H_

#include <iostream>
#include <deque>
#include <string>
#include <mutex>
#include <condition_variable>
#include <pthread.h>
#include <ostream>
#include <fstream>
#include <sstream>
#include <ctime>

using namespace std;

class CLogger
{
public:
    enum class ElogLevel { eNone = 0, eError, eWarning, eInfo, eDebug };

    typedef struct
    {
        string logString;
        ElogLevel logLevel;
    } logline_t;

    static CLogger* instance(ElogLevel ll = ElogLevel::eError);

    bool startLog(string fileName, bool verbose);
    logline_t pop_front();
    void push_back(logline_t s);
    void setLogLevel(ElogLevel ll);
    void stopLog();

    template<typename T>
    CLogger& operator<<(const T& t)
    {
        if (((int)m_logLine.logLevel <= (int)m_userDefinedLogLevel) && m_logStarted)
        {
            ostringstream stream;
            stream << t;
            m_logLine.logString += stream.str();

            if (stream.str().find("\n") != string::npos)
            {
                push_back(m_logLine);
                m_logLine.logString.clear();
            }
        }

        return *this;
    }

protected:
    virtual void threadLoop();

private:
    CLogger() {};                               // Private so that it can  not be called
    CLogger(CLogger const&) {};                 // copy constructor is private
    CLogger& operator= (CLogger const&) {};     // assignment operator is private

    static CLogger* mp_instance;
    bool m_logStarted;
    logline_t m_logLine;
    ElogLevel m_userDefinedLogLevel;
    ofstream m_logFileStream;
    bool m_verbose;
    bool m_finishLog;

    static void * threadHelper(void* handler)
    {
        ((CLogger*)handler)->threadLoop();
        return NULL;
    }

    deque<logline_t> m_data;
    mutex m_mutex;
    condition_variable m_cv;
    pthread_t   m_thread;
};

#endif /* CLOGGER_H_ */