/**
  @file
  @author Stefan Frings
*/

#ifndef HTTPSESSION_H
#define HTTPSESSION_H

#include <QByteArray>
#include <QVariant>
#include <QReadWriteLock>

#include <QSet>
#include <QString>
#include "comic.h"

/**
  This class stores data for a single HTTP session.
  A session can store any number of key/value pairs. This class uses implicit
  sharing for read and write access. This class is thread safe.
  @see HttpSessionStore should be used to create and get instances of this class.
*/

class HttpSession {

public:

	/**
	  Constructor.
	  @param canStore The session can store data, if this parameter is true.
	  Otherwise all calls to set() and remove() do not have any effect.
	 */
	HttpSession(bool canStore=false);

	/**
	  Copy constructor. Creates another HttpSession object that shares the
	  data of the other object.
	*/
	HttpSession(const HttpSession& other);

	/**
	  Copy operator. Detaches from the current shared data and attaches to
	  the data of the other object.
	*/
	HttpSession& operator= (const HttpSession& other);


	/**
	  Destructor. Detaches from the shared data.
	*/
	virtual ~HttpSession();

	/** Get the unique ID of this session. This method is thread safe. */
	QByteArray getId() const;

	/**
	  Null sessions cannot store data. All calls to set() and remove() 
	  do not have any effect.This method is thread safe.
	*/
	bool isNull() const;

	/** Set a value. This method is thread safe. */
	void set(const QByteArray& key, const QVariant& value);

	/** Remove a value. This method is thread safe. */
	void remove(const QByteArray& key);

	/** Get a value. This method is thread safe. */
	QVariant get(const QByteArray& key) const;

	/** Check if a key exists. This method is thread safe. */
	bool contains(const QByteArray& key) const;

	/**
	  Get a copy of all data stored in this session.
	  Changes to the session do not affect the copy and vice versa.
	  This method is thread safe.
	*/
	QMap<QByteArray,QVariant> getAll() const;

	/**
	  Get the timestamp of last access. That is the time when the last
	  HttpSessionStore::getSession() has been called.
	  This method is thread safe.
	*/
	qint64 getLastAccess() const;

	/**
	  Set the timestamp of last access, to renew the timeout period.
	  Called by  HttpSessionStore::getSession().
	  This method is thread safe.
	*/
	void setLastAccess();

	//AÑADIDO
	//sets
	void setComicsOnDevice(const QSet<QString> & set);
	void setComicOnDevice(const QString & hash);
	void setDownloadedComic(const QString & hash);
	bool isComicOnDevice(const QString & hash);
	bool isComicDownloaded(const QString & hash);
	QSet<QString> getComicsOnDevice();
	QSet<QString> getDownloadedComics();
    void clearComics();

    //current comic (import)
	qulonglong getCurrentComicId();
	Comic * getCurrentComic();
	void dismissCurrentComic();
	void setCurrentComic(qulonglong id, Comic * comic);

    //current comic (read)
    qulonglong getCurrentRemoteComicId();
    Comic * getCurrentRemoteComic();
    void dismissCurrentRemoteComic();
    void setCurrentRemoteComic(qulonglong id, Comic * comic);
	
	//device identification
	QString getDeviceType();
	QString getDisplayType();
	void setDeviceType(const QString & device);
	void setDisplayType(const QString & display);


    /*int popPage();
	void pushPage(int page);
	int topPage();

    void clearFoldersPath();
    int popFolder();
    void pushFolder(int page);
    int topFolder();
    QStack<int> getFoldersPath();*/

    void clearNavigationPath();
    QPair<qulonglong, quint32> popNavigationItem();
    QPair<qulonglong, quint32> topNavigationItem();
    void pushNavigationItem(const QPair<qulonglong, quint32> & item);
    void updateTopItem(const QPair<qulonglong, quint32> & item);

    //TODO replace QPair by a custom class for storing folderId, page and folderName(save some DB accesses)
    QStack<QPair<qulonglong, quint32> > getNavigationPath();




private:

	struct YACReaderSessionData {
		//cómics disponibles en dispositivo
		QSet<QString> comicsOnDevice;
		//cómics que han sido descargados o están siendo descargados en esta sesión
		QSet<QString> downloadedComics;
		//cómic actual que está siendo descargado
		QString device;
		QString display;
		qulonglong comicId;
        qulonglong remoteComicId;

        //folder_id, page_number
        QStack<QPair<qulonglong, quint32> > navigationPath;

		Comic * comic;
        Comic * remoteComic;
	};

	struct HttpSessionData {

		/** Unique ID */
		QByteArray id;

		/** Timestamp of last access, set by the HttpSessionStore */
		qint64 lastAccess;

		/** Reference counter */
		int refCount;

		/** Used to synchronize threads */
		QReadWriteLock lock;

		/** Storage for the key/value pairs; */
		QMap<QByteArray,QVariant> values;

		YACReaderSessionData yacreaderSessionData;

	};

	/** Pointer to the shared data. */
	HttpSessionData* dataPtr;

};

#endif // HTTPSESSION_H
