/*
 * multifiletransfermodel.cpp - model for file transfers
 * Copyright (C) 2019  Sergey Ilinykh
 *
 * 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, see <https://www.gnu.org/licenses/>.
 *
 */

#ifndef MULTIFILETRANSFERMODEL_H
#define MULTIFILETRANSFERMODEL_H

#include <QAbstractListModel>
#include <QSet>
#include <QTimer>

#include <functional>
#include <optional>

class MultiFileTransferItem;

class MultiFileTransferModel : public QAbstractListModel {
    Q_OBJECT
public:
    enum Direction { Incoming, Outgoing };

    enum State { AddTemplate, Pending, Active, Failed, Done };

    enum {
        FullSizeDefinedRole = Qt::UserRole,
        FullSizeRole,
        CurrentSizeRole,
        SpeedRole,
        DescriptionRole,
        DirectionRole,
        StateRole,
        TimeRemainingRole,
        ErrorStringRole,

        // requests
        RejectFileRole, // reject trasnfer of specific file
        DeleteFileRole, // for finished-incoming files only (remove from disk)
        OpenDirRole,
        OpenFileRole
    };

    MultiFileTransferModel(QObject *parent);
    ~MultiFileTransferModel();

    Qt::ItemFlags          flags(const QModelIndex &index) const override;
    int                    rowCount(const QModelIndex &parent = QModelIndex()) const override;
    QVariant               data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
    bool                   setData(const QModelIndex &index, const QVariant &value, int role) override;
    QModelIndex            index(int row, int column, const QModelIndex &parent) const override;
    QHash<int, QByteArray> roleNames() const override;

    void                   clear();
    MultiFileTransferItem *addTransfer(Direction direction, const QString &displayName,
                                       std::optional<quint64> fullSize);
    void                   forEachTransfer(const std::function<void(MultiFileTransferItem *)> cb) const;
    void                   setAddEnabled(bool enabled = true);
    bool                   isAddEnabled() const;

private:
    QList<MultiFileTransferItem *> transfers;
    QSet<MultiFileTransferItem *>  updatedTransfers;
    QTimer                         updateTimer;
    bool                           addEnabled = true;
};

#endif // MULTIFILETRANSFERMODEL_H
