// 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 MESSAGESVIEW_H
#define MESSAGESVIEW_H

#include "core/messagesmodel.h"

#include "services/abstract/rootitem.h"

#include <QTreeView>
#include <QHeaderView>


class MessagesProxyModel;

class MessagesView : public QTreeView {
    Q_OBJECT

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

    // Model accessors.
    inline MessagesProxyModel *model() const {
      return m_proxyModel;
    }

    inline MessagesModel *sourceModel() const {
      return m_sourceModel;
    }

  public slots:
    void keyboardSearch(const QString &search);

    // Called after data got changed externally
    // and it needs to be reloaded to the view.
    // If "mark_current_index_read" is 0, then message with
    // "current" index is not marked as read.
    void reloadSelections(bool mark_current_index_read);

    // Loads un-deleted messages from selected feeds.
    void loadItem(RootItem *item);

    // Message manipulators.
    void openSelectedSourceMessagesExternally();
    void openSelectedMessagesInternally();
    void sendSelectedMessageViaEmail();

    // Works with SELECTED messages only.
    void setSelectedMessagesReadStatus(RootItem::ReadStatus read);
    void markSelectedMessagesRead();
    void markSelectedMessagesUnread();
    void switchSelectedMessagesImportance();
    void deleteSelectedMessages();
    void restoreSelectedMessages();

    void selectNextItem();
    void selectPreviousItem();
    void selectNextUnreadItem();

    // Searchs the visible message according to given pattern.
    void searchMessages(const QString &pattern);
    void filterMessages(MessagesModel::MessageHighlighter filter);

    void createNewspaperView(RootItem *selected_item, const QList<Message> &messages);

  private slots:
    // Marks given indexes as selected.
    void reselectIndexes(const QModelIndexList &indexes);

    // Changes resize mode for all columns.
    void adjustColumns();

    // Saves current sort state.
    void onSortIndicatorChanged(int column, Qt::SortOrder order);

  signals:
    // Link/message openers.
    void openLinkNewTab(const QString &link);
    void openLinkMiniBrowser(const QString &link);
    void openMessagesInNewspaperView(RootItem *root, const QList<Message> &messages);

    // Notify others about message selections.
    void currentMessageChanged(const Message &message, RootItem *root);
    void currentMessageRemoved();

  private:
    // Creates needed connections.
    void createConnections();

    // Initializes context menu.
    void initializeContextMenu();

    // Sets up appearance.
    void setupAppearance();

    // Event reimplementations.
    void contextMenuEvent(QContextMenuEvent *event);
    void mousePressEvent(QMouseEvent *event);
    void keyPressEvent(QKeyEvent *event);
    void selectionChanged(const QItemSelection &selected, const QItemSelection &deselected);

    QMenu *m_contextMenu;

    MessagesProxyModel *m_proxyModel;
    MessagesModel *m_sourceModel;

    bool m_columnsAdjusted;
    bool m_batchUnreadSwitch;
};

#endif // MESSAGESVIEW_H