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#ifndef FILEMANAGER_H

#define FILEMANAGER_H

#include <QBitArray>

#include <QList>

#include <QMutex>

#include <QThread>

#include <QWaitCondition>

#include "metainfo.h"

QT_BEGIN_NAMESPACE

class QByteArray;

class QFile;

class QTimerEvent;

QT_END_NAMESPACE

class FileManager : public QThread

{

    Q_OBJECT

public:

    FileManager(QObject *parent = 0);

    virtual ~FileManager();

    inline void setMetaInfo(const MetaInfo &info) { metaInfo = info; }

    inline void setDestinationFolder(const QString &directory) { destinationPath = directory; }

    int read(int pieceIndex, int offset, int length);

    void write(int pieceIndex, int offset, const QByteArray &data);

    void verifyPiece(int pieceIndex);

    inline qint64 totalSize() const { return totalLength; }

    inline int pieceCount() const { return numPieces; }

    int pieceLengthAt(int pieceIndex) const;

    QBitArray completedPieces() const;

    void setCompletedPieces(const QBitArray &pieces);

    QString errorString() const;

public slots:

    void startDataVerification();

signals:

    void dataRead(int id, int pieceIndex, int offset, const QByteArray &data);

    void error();

    void verificationProgress(int percent);

    void verificationDone();

    void pieceVerified(int pieceIndex, bool verified);

protected:

    void run();

private slots:

    bool verifySinglePiece(int pieceIndex);

    void wakeUp();

private:

    bool generateFiles();

    QByteArray readBlock(int pieceIndex, int offset, int length);

    bool writeBlock(int pieceIndex, int offset, const QByteArray &data);

    void verifyFileContents();

    struct WriteRequest {

        int pieceIndex;

        int offset;

        QByteArray data;

    };

    struct ReadRequest {

        int pieceIndex;

        int offset;

        int length;

        int id;

    };

    QString errString;

    QString destinationPath;

    MetaInfo metaInfo;

    QList<QFile *> files;

    QList<QByteArray> sha1s;

    QBitArray verifiedPieces;

    bool newFile;

    int pieceLength;

    qint64 totalLength;

    int numPieces;

    int readId;

    bool startVerification;

    bool quit;

    bool wokeUp;

    QList<WriteRequest> writeRequests;

    QList<ReadRequest> readRequests;

    QList<int> pendingVerificationRequests;

    QList<int> newPendingVerificationRequests;

    QList<qint64> fileSizes;

    mutable QMutex mutex;

    mutable QWaitCondition cond;

};

#endif