/***************************************************************************
 *   Copyright (C) 2007 by Joris Guisson and Ivan Vasic                    *
 *   joris.guisson@gmail.com                                               *
 *   ivasic@gmail.com                                                      *
 *                                                                         *
 *   This program 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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
 ***************************************************************************/

#ifndef KTVIEWMODEL_H
#define KTVIEWMODEL_H

#include <QAbstractTableModel>
#include <QList>

#include <torrent/torrentstats.h>
#include <util/constants.h>

namespace bt {
    class TorrentInterface;
}

namespace kt
{
    class View;
    class ViewDelegate;
    class Core;
    class Group;

    /**
     * @author Joris Guisson
     *
     * Model for the main torrent view
    */
    class ViewModel : public QAbstractTableModel
    {
        Q_OBJECT
    public:
        ViewModel(Core* core, View* parent);
        ~ViewModel() override;

        /**
         * Set the Group to filter
         * @param g The group
         */
        void setGroup(Group* g);

        /**
         * Update the model, checks if data has changed.
         $ @param delegate The ViewDelegate, so we don't hide extended items
         * @param force_resort Force a resort
         * @return true if the model got resorted
         */
        bool update(ViewDelegate* delegate, bool force_resort = false);

        /**
         * Set the current filter string
         * @param filter The filter string
         */
        void setFilterString(const QString& filter);

        int rowCount(const QModelIndex& parent = QModelIndex()) const override;
        int columnCount(const QModelIndex& parent = QModelIndex()) const override;
        QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
        QVariant data(const QModelIndex& index, int role) const override;
        bool removeRows(int row, int count, const QModelIndex& parent) override;
        bool insertRows(int row, int count, const QModelIndex& parent) override;
        Qt::ItemFlags flags(const QModelIndex& index) const override;
        QStringList mimeTypes() const override;
        QMimeData* mimeData(const QModelIndexList& indexes) const override;
        bool setData(const QModelIndex& index, const QVariant& value, int role) override;
        QModelIndex index(int row, int column, const QModelIndex& parent = QModelIndex()) const override;
        bool dropMimeData(const QMimeData* data, Qt::DropAction action, int row, int column, const QModelIndex& parent) override;
        Qt::DropActions supportedDropActions() const override;

        /**
         * Emit the data changed signal
         * @param row The row
         * @param col The column
         */
        void emitDataChanged(int row, int col);

        /**
         * Get a list of torrents from an index list.
         * @param idx The index list
         * @param tlist The torrent list to fill
         */
        void torrentsFromIndexList(const QModelIndexList& idx, QList<bt::TorrentInterface*> & tlist);

        /**
         * Get a torrent from a model index.
         * @param index The model index
         * @return The torrent if the index is valid and in the proper range, 0 otherwise
         */
        bt::TorrentInterface *torrentFromIndex(const QModelIndex& index) const;

        /**
         * Get a torrent from a row.
         * @param index The row index
         * @return The torrent if the index is valid and in the proper range, 0 otherwise
         */
        bt::TorrentInterface* torrentFromRow(int index) const;

        /**
         * Get all torrents
         * @param tlist The list of torrents to fill
         */
        void allTorrents(QList<bt::TorrentInterface*> & tlist) const;

        /**
         * Visit all visible torrents in the model, and apply an action to them
         */
        template<class Action>
        void visit(Action& a)
        {
            for (Item* item : qAsConst(torrents))
            {
                if (item->visible(group, filter_string))
                    if (!a(item->tc))
                        break;
            }
        }

        /// Get the list of indexes which need to be updated
        const QModelIndexList& updateList() const {return update_list;}

    public slots:
        void addTorrent(bt::TorrentInterface* ti);
        void removeTorrent(bt::TorrentInterface* ti);
        void sort(int col, Qt::SortOrder order) override;
        void onExit();

    signals:
        void sorted();

    public:
        enum Column
        {
            NAME = 0,
            BYTES_DOWNLOADED,
            TOTAL_BYTES_TO_DOWNLOAD,
            BYTES_LEFT,
            BYTES_UPLOADED,
            DOWNLOAD_RATE,
            UPLOAD_RATE,
            ETA,
            SEEDERS,
            LEECHERS,
            PERCENTAGE,
            SHARE_RATIO,
            DOWNLOAD_TIME,
            SEED_TIME,
            DOWNLOAD_LOCATION,
            TIME_ADDED,
            _NUMBER_OF_COLUMNS
        };

        struct Item
        {
            bt::TorrentInterface* tc;
            // cached values to avoid unneeded updates
            bt::TorrentStatus status;
            bt::Uint64 bytes_downloaded;
            bt::Uint64 bytes_uploaded;
            bt::Uint64 total_bytes_to_download;
            bt::Uint64 bytes_left;
            bt::Uint32 download_rate;
            bt::Uint32 upload_rate;
            bt::Uint32 seeders_total;
            bt::Uint32 seeders_connected_to;
            bt::Uint32 leechers_total;
            bt::Uint32 leechers_connected_to;
            double percentage;
            float share_ratio;
            bt::Uint32 runtime_dl;
            bt::Uint32 runtime_ul;
            int eta;
            bool hidden;
            QDateTime time_added;
            bool highlight;

            Item(bt::TorrentInterface* tc);

            bool update(int row, int sort_column, QModelIndexList& to_update, ViewModel* model);
            QVariant data(int col) const;
            QVariant color(int col) const;
            QVariant statusIcon() const;
            bool lessThan(int col, const Item* other) const;
            bool visible(Group* group, const QString& filter_string) const;
        };

    private:
        Core* core;
        View* view;
        QVector<Item*> torrents;
        int sort_column;
        Qt::SortOrder sort_order;
        Group* group;
        int num_visible;
        QModelIndexList update_list;
        QString filter_string;
    };

}

#endif
