/*
  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>
#include <QThreadPool>
#include <QRunnable>

class SmTreeItem;
class QSemaphore;
class SmDataColletor;
class AsyncTask;
class Md5Summer;

class SmDirWatcher : public QThread {
    Q_OBJECT
    public:
        enum DWEvent { None, Added, Deleted, Modified, Populate, CloseWrite };
        explicit SmDirWatcher(int numFields, QObject *parent = 0);
    
    signals:
        void dwEvent(const QString& file, int event);
        void setMd5Sum(QString path, QString md5);
        void setFfmpeg(QString path, QVariantMap data);
        void setPicSize(QString path, QVariant size);
        void needRefresh();
        void population(SmTreeItem*);
        void newData(const QList<QVariant>,int);
    
    public slots:
        void run();
        void stop();
        void setDir(const QString &dir);
        void startAsyncJobs();
        void gatherAsync(const QString &path);
        void setExpensiveOps(bool expensiveOps);

    private:
        QList<QVariant> generalData(const QString &path);
        int mFd;
        int mDescr;
        QString mCurrent;
        char *mINdata;
        int mBufLen;
        QThreadPool *mAsyncPool;
        int mNumFields;
        QList<AsyncTask*> mAsyncTasks;
        bool mExpensiveOps;
};

class AsyncTask : public QObject, public QRunnable {
    Q_OBJECT
    public:
        explicit AsyncTask(const QString &path = QString());
        bool skipMe();

    protected:
        virtual void run() = 0;
        bool mSkip;
        QMutex mStatusMx;
        const QString mPath;
};

class Md5Summer : public AsyncTask {
    Q_OBJECT
    public:
        explicit Md5Summer(const QString &path);

    signals:
        void md5sumDone(QString, QString);

    protected:
        virtual void run();
};

class FfmpegGatherer : public AsyncTask {
    Q_OBJECT
    public:
        explicit FfmpegGatherer(const QString &path);

    signals:
        void ffmpegDone(QString, QVariantMap);

    protected:
        virtual void run();
};

class PicSizeGatherer : public AsyncTask {
    Q_OBJECT
    public:
        explicit PicSizeGatherer(const QString &path);

    signals:
        void picSizeDone(QString, QVariant);

    protected:
        virtual void run();
};

#endif // SMDIRWATCHER_H