Index: sources/storage/logger.cpp
===================================================================
diff -u -r781e62c996e81897517fbdb1bc79fe3bbcf165c1 -r5963f00ffd2c557d3ae06a5deea05032a3a3bd68
--- sources/storage/logger.cpp	(.../logger.cpp)	(revision 781e62c996e81897517fbdb1bc79fe3bbcf165c1)
+++ sources/storage/logger.cpp	(.../logger.cpp)	(revision 5963f00ffd2c557d3ae06a5deea05032a3a3bd68)
@@ -13,9 +13,103 @@
  */
 #include "logger.h"
 
+// Qt
+#include <QDateTime>
+#include <QDebug>
+#include <QDir>
+#include <QApplication>
+
+// Project
+#include "filehandler.h"
+
 using namespace Storage;
 
-Logger::Logger(QObject *parent) : QObject(parent)
+// Singleton
+SINGLETON_INIT(Logger)
+
+
+Logger::Logger(QObject *parent) : QObject(parent) { }
+
+bool Logger::init()
 {
+    checkLogPath();
+    initConnections();
+    return true;
+}
 
+void Logger::initConnections() { }
+
+void Logger::checkLogPath()
+{
+    setLogBasePath();           // try to use /media/sd_card on device
+    if (! setLogPath()) {       // check and create log folders & if unsuccessful then
+        setLogBasePath(true);   // try to use application folder
+        setLogPath    (    );   // check and create log folders // Note: it may require to check for write access regarding device setup
+    }
 }
+
+void Logger::setLogBasePath(bool vUseApplicationDirPath)
+{
+    if (vUseApplicationDirPath) {
+        _dir.setPath(qApp->applicationDirPath());
+        qDebug() << "WARNING :" << tr("Application Dir Path used for events logging (%1)").arg(_dir.path());
+    } else {
+        _dir.setPath(_logBasePathName);
+    }
+}
+
+bool Logger::setLogPath()
+{
+    bool ok = true;
+    ok = ok && setLogPath(eLogDatum);
+    ok = ok && setLogPath(eLogEvent);
+    ok = ok && setLogPath(eLogError);
+    return ok;
+}
+
+bool Logger::setLogPath(Logger::LogType_Enum vLogType)
+{
+    _logPathNames[vLogType] = _dir.path() + "/" + _logBasePathNames[vLogType];
+    if ( ! _dir.exists(_logBasePathNames[vLogType]) ) {
+        if ( ! _dir.mkpath(_logBasePathNames[vLogType]) ) {
+            qDebug() << "ERROR :" << tr("Can't create %1 log path (%2)")
+                        .arg(_logPrefix[vLogType])
+                        .arg(_logPathNames[vLogType])
+                        ;
+            return false;
+        }
+    }
+    return true;
+}
+
+bool Logger::log(const QString &vContent, LogType_Enum vLogType) {
+    QString date = QDate::currentDate().toString(_dateFormat);
+    QString mContent;
+
+    switch (vLogType) {
+    case eLogDatum:
+    case eLogEvent:
+    case eLogError:
+        break;
+    default:
+        Q_ASSERT_X(false, "Logger::log", "Incorrect type of logging");
+    }
+    mContent += _logPrefix[vLogType];
+    mContent += _prefixSeparator;
+    mContent += QTime::currentTime().toString(_timeFormat);
+    mContent += _timeSeparator + vContent + "\r\n";
+    QString fileName = date + _dateSeparator + _logFileName;
+    _FileHandler->doWrite(_logPathNames[vLogType] + fileName, mContent);
+    qDebug() << mContent;
+    return true;
+}
+
+void Logger::doLog(const QString &vContent, LogType_Enum vLogType)
+{
+    emit didLog(log(vContent, vLogType));
+}
+
+void Logger::doExportLog()
+{
+    _FileHandler->doExportFolder(_logBasePathNameExport);
+}