/**
  * @RDE_HEADER@
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Hannes Fritsche, NLE, 2019-04-30
  */

#pragma once

#include <QObject>
#include <QString>
#include <QVector>
#include <QSqlDatabase>

#include <DBAdministration/exercise_table_generator.h>
#include <FileManagement/flm_db.h>
#include "WebSocketInterface/Messages/client_message.h"
#include "settings.h"
#include "logger.h"

namespace OcBaseDownload
{
class PdfDownloadSocket;
class MainHandler;

class  PdfDownloader
  : public QObject
{
  Q_OBJECT
public:

  explicit PdfDownloader(const QVector<WebSocketInterface::Messages::PdfListMessage::PdfInformation> &pdfInfoVec,
                         MainHandler *mainHandler,
                         const QString &hostName,
                         int exerciseId,
                         QObject *parent);
  ~PdfDownloader();

  bool startDownload();

Q_SIGNALS:
  void newState(int progress, const QString &msg);
  void allDownloadsFinished();

private Q_SLOTS:
  void onSingleDownloadFinished(const QByteArray &data);

private: // other
  typedef WebSocketInterface::Messages::PdfListMessage::PdfInformation PdfInfo;

private: // methods
  bool hasCompletedFolderStructure();
  bool startNextDownload();

  bool openDbConnection();
  QSqlDatabase openDb(bool *bOk);
  void closeDb(QSqlDatabase &dbConn);

private: // attributes
  QVector<PdfInfo>                          m_pdfInfoVec;
  PdfInfo                                   m_currentDownload;
  PdfDownloadSocket                        *m_socket;
  MainHandler                              *m_mainHandler;
  int                                       m_exerciseId;
  QSqlDatabase                              m_dbConnection;
  DBAdministration::ExerciseTableGenerator *m_exTblGen;
  int                                       m_downloadCount;
  int                                       m_totalDownloads;

  NGL::INGLLogger   &m_logger;
};
}