text: /*-
   * Copyright (c) 2014 Peter Tworek
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   * notice, this list of conditions and the following disclaimer in the
   * documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the author nor the names of any co-contributors
   * may be used to endorse or promote products derived from this software
   * without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #ifndef YTLOCALVIDEOMANAGER_H
  #define YTLOCALVIDEOMANAGER_H
  
  #include <QSharedPointer>
  #include <QScopedPointer>
  #include <QNetworkReply>
  #include <QWeakPointer>
  #include <QObject>
  #include <QMutex>
  #include <QUrl>
  #include <QMap>
  
  class QNetworkAccessManager;
  class YTLocalVideoData;
  class YTDownloadInfo;
  
  class YTLocalVideoManager: public QObject
  {
      Q_OBJECT
  public:
      static YTLocalVideoManager& instance();
  
      QSharedPointer<YTLocalVideoData> getDataForVideo(QString videoId);
  
      void download(QSharedPointer<YTLocalVideoData>);
      void removeDownload(QString videoId);
      void pauseDownload(QString videoId);
      void resumeDownload(QString videoId);
      void downloadSettingsChanged();
  
  signals:
      // Notifications for the UI
      void downloadFinished(QString video);
      void downloadFailed(QString video);
  
  private slots:
      void onDownloadFinished(YTDownloadInfo*);
      void onDownloadFailed(YTDownloadInfo*);
      void onVideoDataDestroyed(QString videoId);
      void onOnlineChanged(bool);
      void onCellularChanged(bool);
      void onProcessQueuedDownloads();
      void onDownloadSettingsChanged();
  
      void onRestoreDownloads();
      void onDownload(QSharedPointer<YTLocalVideoData> data);
      void onRemoveDownload(QString videoId);
      void onPauseDownload(QString videoId);
      void onResumeDownload(QString videoId);
  
  private:
      explicit YTLocalVideoManager(QObject *parent = 0);
  
      void processQueuedDownloads();
      void stopInProgressDownloads();
  
      typedef QList<YTDownloadInfo*> YTDownloadInfoList;
      typedef QMap<QString, QWeakPointer<YTLocalVideoData> > YTManagedVideosMap;
  
      QMutex _managedVideosMutex;
      YTDownloadInfoList _queuedDownloads;
      YTDownloadInfoList _inProgressDownloads;
      YTDownloadInfoList _pausedDownloads;
      YTManagedVideosMap _managedVideos;
      QNetworkAccessManager* _networkAccessManager;
      bool _queueProcessingScheduled;
  
      Q_DISABLE_COPY(YTLocalVideoManager)
  };
  
  #endif // YTVIDEODOWNLOADER_H
  