// This file is part of RSS Guard.
//
// Copyright (C) 2011-2016 by Martin Rotter <rotter.martinos@gmail.com>
//
// RSS Guard is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// RSS Guard is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with RSS Guard. If not, see <http://www.gnu.org/licenses/>.

#ifndef FEEDSPROXYMODEL_H
#define FEEDSPROXYMODEL_H

#include <QSortFilterProxyModel>


class FeedsModel;
class RootItem;

class FeedsProxyModel : public QSortFilterProxyModel {
    Q_OBJECT

  public:
    // Constructors and destructors.
    explicit FeedsProxyModel(QObject *parent = 0);
    virtual ~FeedsProxyModel();

    // Access to the source model.
    inline FeedsModel *sourceModel() const {
      return m_sourceModel;
    }

    // Returns index list of items which "match" given value.
    // Used for finding items according to entered title text.
    QModelIndexList match(const QModelIndex &start, int role, const QVariant &value, int hits, Qt::MatchFlags flags) const;

    // Maps list of indexes.
    QModelIndexList mapListToSource(const QModelIndexList &indexes) const;

    bool showUnreadOnly() const;
    void setShowUnreadOnly(bool show_unread_only);

    const RootItem *selectedItem() const;
    void setSelectedItem(const RootItem *selected_item);

  public slots:
    void invalidateReadFeedsFilter(bool set_new_value = false, bool show_unread_only = false);

  private slots:
    void invalidateFilter();

  private:
    // Compares two rows of data.
    bool lessThan(const QModelIndex &left, const QModelIndex &right) const;
    bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const;

    // Source model pointer.
    FeedsModel *m_sourceModel;
    const RootItem *m_selectedItem;
    bool m_showUnreadOnly;
};

#endif // FEEDSPROXYMODEL_H
