/*
    SPDX-FileCopyrightText: 2015 Eike Hein <hein@kde.org>
    SPDX-FileCopyrightText: 2017 Ivan Cukic <ivan.cukic@kde.org>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#pragma once

#include "abstractmodel.h"

#include <QPointer>
#include <QTimer>

class PlaceholderModel : public AbstractModel
{
    Q_OBJECT

    Q_PROPERTY(QAbstractItemModel *sourceModel READ sourceModel WRITE setSourceModel NOTIFY sourceModelChanged)
    Q_PROPERTY(int dropPlaceholderIndex READ dropPlaceholderIndex WRITE setDropPlaceholderIndex NOTIFY dropPlaceholderIndexChanged)

public:
    explicit PlaceholderModel(QObject *parent = nullptr);
    ~PlaceholderModel() override;

    QString description() const override;

    QAbstractItemModel *sourceModel() const;
    virtual void setSourceModel(QAbstractItemModel *sourceModel);

    bool canFetchMore(const QModelIndex &parent) const override;
    void fetchMore(const QModelIndex &parent) override;

    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override;
    QModelIndex parent(const QModelIndex &index) const override;

    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;

    int rowCount(const QModelIndex &parent = QModelIndex()) const override;

    Q_INVOKABLE bool trigger(int row, const QString &actionId, const QVariant &argument) override;

    Q_INVOKABLE QString labelForRow(int row) override;

    Q_INVOKABLE AbstractModel *modelForRow(int row) override;

    AbstractModel *favoritesModel() override;

    int separatorCount() const override;

    int dropPlaceholderIndex() const;
    void setDropPlaceholderIndex(int index);

public Q_SLOTS:
    void reset();

Q_SIGNALS:
    void sourceModelChanged();
    void dropPlaceholderIndexChanged();

protected:
    void inhibitTriggering();

private:
    QModelIndex indexToSourceIndex(const QModelIndex &index) const;
    QModelIndex sourceIndexToIndex(const QModelIndex &index) const;
    int sourceRowToRow(int sourceRow) const;
    int rowToSourceRow(int row) const;

    void connectSignals();
    void disconnectSignals();

    QPointer<QAbstractItemModel> m_sourceModel;

    int m_dropPlaceholderIndex;
    bool m_isTriggerInhibited;
    QTimer m_triggerInhibitor;
};