/*
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  as published by the Free Software Foundation; either version
  2 of the License, or (at your option) any later version.
*/

#ifndef SMDIRWATCHER_H
#define SMDIRWATCHER_H

#include <QThread>
#include <QList>
#include <QVariant>
#include <QFileInfo>
#include <QQueue>
#include <QMutex>
#include <QSqlDatabase>
#include <QSqlQuery>

class SmTreeItem;
class QSemaphore;
class SmDataColletor;

class SmDirWatcher : public QThread {
    Q_OBJECT
    public:
        enum DWEvent { None, Added, Deleted, Modified, Populate };
        explicit SmDirWatcher(int numFields, QObject *parent = 0);
        SmDataColletor *collector() { return mCollector; }
    
    signals:
        void dwEvent(const QString& file, int event);
        void needRefresh();
    
    public slots:
        void run();
        void stop();
        void setDir(const QString &dir);

    private:
        int mFd;
        int mDescr;
        QString mCurrent;
        SmDataColletor *mCollector;
        QSemaphore *mSemFree;
        QSemaphore *mSemUsed;
        QQueue<QPair<QString, DWEvent> > *mDataQueue;
        QMutex *mQueueMx;
        char *mINdata;
        int mBufLen;
};

class SmDataColletor : public QThread {
    Q_OBJECT
    public:
        explicit SmDataColletor(const int numFields, QObject *parent = 0);
        void init(QSemaphore *set, QSemaphore *get, QQueue<QPair<QString, SmDirWatcher::DWEvent> > *data, QMutex *queueMx);

    public slots:
        void setCheckForPresent(bool present);
        void run();
        void stop() { mCancel = true; }

    signals:
        void newData(const QList<QVariant>,int);
        void population(SmTreeItem*);
        void needRefresh();

     private:
        SmTreeItem *populate(const QString &dir);
        const QList<QVariant> fileData(const QFileInfo &fi);
        QString mCurrent;
        QSemaphore *mSemFree;
        QSemaphore *mSemUsed;
        QMutex *mQueueMx;
        QQueue<QPair<QString, SmDirWatcher::DWEvent> > *mDataQueue;
        int mMode;
        const int mNumFields;
        bool mCheckForPresent;
        bool mCancel;
        QMutex mCheckForPresentMx;
        QSqlQuery *mPicPresentQ;
        QSqlQuery *mMovPresentQ;
};

#endif // SMDIRWATCHER_H