// This file is part of RSS Guard.
//
// Copyright (C) 2011-2017 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.
		void reloadSelections();

		// 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);

	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:
		void sort(int column, Qt::SortOrder order, bool repopulate_data, bool change_header, bool emit_changed_from_header);

		// 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;
};

#endif // MESSAGESVIEW_H