/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*  Version     : %version: 6 %

*/

#ifndef HGCACHEPROXYMODEL_H_

#define HGCACHEPROXYMODEL_H_

#include <QAbstractItemModel>

#include <QSortFilterProxyModel>

#include <hgwidgets/hgdataprovidermodel.h>

#ifdef BUILD_CACHEPROXYMODEL

#define CACHEPROXYMODEL_EXPORT Q_DECL_EXPORT

#else

#define CACHEPROXYMODEL_EXPORT Q_DECL_IMPORT

#endif

class HgBufferManager;

const int KDefaultCacheSize = 120;

const int KDefaultCacheTreshold = 30;

class HgBufferManagerObserver

{

public:

    enum HgRequestOrder {

        HgRequestOrderAscending,

        HgRequestOrderDescending

    };   

    virtual void release(int start, int end) = 0;

    virtual void request(int start, int end, HgRequestOrder order = HgRequestOrderAscending) = 0;  

};

class CACHEPROXYMODEL_EXPORT HgCacheProxyModel : public QAbstractItemModel, public HgBufferManagerObserver, public HgDataProviderModelObserver

{

    Q_OBJECT

public:

    HgCacheProxyModel(QObject *parent = 0);

    ~HgCacheProxyModel();   

    void setDataProvider(HgDataProviderModel *dataProvider, int cacheSize = KDefaultCacheSize, int cacheTreshold = KDefaultCacheTreshold);

    HgDataProviderModel* DataProvider();

    void resizeCache(int newSize, int newTreshold);

//from QAbstractItemModel

    virtual QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;

    virtual QModelIndex parent(const QModelIndex &child) const;

    virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;

    virtual int columnCount(const QModelIndex &parent = QModelIndex()) const;

    virtual bool hasChildren(const QModelIndex &parent = QModelIndex()) const;

    virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;

    virtual bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);

    virtual QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;

    virtual bool setHeaderData(int section, Qt::Orientation orientation, const QVariant &value, int role = Qt::EditRole);

    virtual QMap<int, QVariant> itemData(const QModelIndex &index) const;

    virtual bool setItemData(const QModelIndex &index, const QMap<int, QVariant> &roles);

    virtual QStringList mimeTypes() const;

    virtual QMimeData *mimeData(const QModelIndexList &indexes) const;

    virtual bool dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent);

    virtual Qt::DropActions supportedDropActions() const;

    virtual bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex());

    virtual bool insertColumns(int column, int count, const QModelIndex &parent = QModelIndex());

    virtual bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());

    virtual bool removeColumns(int column, int count, const QModelIndex &parent = QModelIndex());

    virtual void fetchMore(const QModelIndex &parent);

    virtual bool canFetchMore(const QModelIndex &parent) const;

    virtual Qt::ItemFlags flags(const QModelIndex &index) const;

    virtual void sort(int column, Qt::SortOrder order = Qt::AscendingOrder);

    virtual QModelIndex buddy(const QModelIndex &index) const;

    virtual QModelIndexList match(const QModelIndex &start, int role,

                                  const QVariant &value, int hits = 1,

                                  Qt::MatchFlags flags =

                                  Qt::MatchFlags(Qt::MatchStartsWith|Qt::MatchWrap)) const;

    virtual QSize span(const QModelIndex &index) const;

// for sorting

    Qt::CaseSensitivity sortCaseSensitivity() const;

    void setSortCaseSensitivity(Qt::CaseSensitivity cs);

    bool isSortLocaleAware() const;

    void setSortLocaleAware(bool on);

    int sortColumn() const;

    Qt::SortOrder sortOrder() const;

    bool dynamicSortFilter() const;

    void setDynamicSortFilter(bool enable);

    int sortRole() const;

    void setSortRole(int role);

//for filtering

    QRegExp filterRegExp() const;

    void setFilterRegExp(const QRegExp &regExp);

    int filterKeyColumn() const;

    void setFilterKeyColumn(int column);

    Qt::CaseSensitivity filterCaseSensitivity() const;

    void setFilterCaseSensitivity(Qt::CaseSensitivity cs);

    int filterRole() const;

    void setFilterRole(int role);

public slots:

    virtual bool submit();

    virtual void revert();

public:

//from HgBufferManagerObserver

    virtual void release(int start, int end);

    virtual void request(int start, int end, HgRequestOrder order = HgRequestOrderAscending);  

private:

    int count()const;

    QModelIndex mapToSource(const QModelIndex &index)const;

    QModelIndex mapToSource(int row, int col) const;

    int mapToDataProviderIndex(int myIndex) const;

    int mapFromDataProviderIndex(int myIndex) const;

    void releaseAll();

    void setBufferPosition(int pos) const;

private slots:

    void sourceColumnsAboutToBeInserted( const QModelIndex & parent, int start, int end);

    void sourceColumnsAboutToBeMoved( const QModelIndex & sourceParent, int sourceStart, int sourceEnd, const QModelIndex & destinationParent, int destinationColumn );

    void sourceColumnsAboutToBeRemoved( const QModelIndex & parent, int start, int end);

    void sourceColumnsInserted( const QModelIndex & parent, int start, int end );

    void sourceColumnsMoved( const QModelIndex & sourceParent, int sourceStart, int sourceEnd, const QModelIndex & destinationParent, int destinationColumn );

    void sourceColumnsRemoved( const QModelIndex & parent, int start, int end );

    void sourceDataChanged( const QModelIndex & topLeft, const QModelIndex & bottomRight );

    void sourceHeaderDataChanged( Qt::Orientation orientation, int first, int last );

    void sourceLayoutAboutToBeChanged();

    void sourceLayoutChanged();

    void sourceModelAboutToBeReset();

    void sourceModelReset();

    void sourceRowsAboutToBeInserted( const QModelIndex & parent, int start, int end );

    void sourceRowsAboutToBeMoved( const QModelIndex & sourceParent, int sourceStart, int sourceEnd, const QModelIndex & destinationParent, int destinationRow );

    void sourceRowsAboutToBeRemoved( const QModelIndex & parent, int start, int end );

    void sourceRowsInserted( const QModelIndex & parent, int start, int end );

    void sourceRowsMoved( const QModelIndex & sourceParent, int sourceStart, int sourceEnd, const QModelIndex & destinationParent, int destinationRow );

    void sourceRowsRemoved( const QModelIndex & parent, int start, int end );

//from HgDataProviderModelObserver    

public:

    virtual void dataUpdated(int from, int to);

    virtual bool isCached(int idx) const;

private:

    HgBufferManager* mBufferManager;

    QSortFilterProxyModel* mSortFilterProxyModel;

    HgDataProviderModel* mDataProviderModel;

    mutable bool mSupressBM;

    mutable int mCurrentPos;

};

#endif // HGCACHEPROXYMODEL_H_