/*
 * Copyright (c) 2018-2019 Meltytech, LLC
 *
 * 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 3 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 <http://www.gnu.org/licenses/>.
 */

#ifndef KEYFRAMESMODEL_H
#define KEYFRAMESMODEL_H

#include <QAbstractItemModel>
#include <QString>
#include <MltProperties.h>
#include <MltAnimation.h>

class QmlMetadata;
class QmlFilter;

class KeyframesModel : public QAbstractItemModel
{
    Q_OBJECT

public:
    enum InterpolationType {
        DiscreteInterpolation,
        LinearInterpolation,
        SmoothInterpolation
    };
    Q_ENUM(InterpolationType)

    /// Two level model: parameters and keyframes on parameters
    enum Roles {
        NameRole = Qt::UserRole + 1, /// parameter or keyframe
        PropertyNameRole, /// parameter only
        IsCurveRole,      /// parameter only
        MinimumValueRole, /// parameter only
        MaximumValueRole, /// parameter only
        FrameNumberRole,  /// keyframe only
        KeyframeTypeRole, /// keyframe only
        NumericValueRole, /// keyframe only
        MinimumFrameRole, /// keyframe only
        MaximumFrameRole  /// keyframe only
    };

    explicit KeyframesModel(QObject* parent = 0);
    virtual ~KeyframesModel();

    int rowCount(const QModelIndex& parent) const;
    int columnCount(const QModelIndex& parent) const;
    QVariant data(const QModelIndex& index, int role) const;
    QModelIndex index(int row, int column = 0,
                      const QModelIndex& parent = QModelIndex()) const;
    QModelIndex parent(const QModelIndex& index) const;
    QHash<int, QByteArray> roleNames() const;
    void load(QmlFilter*, QmlMetadata*);
    Q_INVOKABLE bool remove(int parameterIndex, int keyframeIndex);
    int previousKeyframePosition(int parameterIndex, int currentPosition);
    int nextKeyframePosition(int parameterIndex, int currentPosition);
    Q_INVOKABLE int keyframeIndex(int parameterIndex, int currentPosition);
    Q_INVOKABLE int parameterIndex(const QString& propertyName) const;
    Q_INVOKABLE bool setInterpolation(int parameterIndex, int keyframeIndex, InterpolationType type);
    Q_INVOKABLE bool setPosition(int parameterIndex, int keyframeIndex, int position);
    Q_INVOKABLE void addKeyframe(int parameterIndex, double value, int position, InterpolationType type);
    Q_INVOKABLE void addKeyframe(int parameterIndex, int position);
    Q_INVOKABLE void setKeyframe(int parameterIndex, double value, int position, InterpolationType type);
    Q_INVOKABLE bool isKeyframe(int parameterIndex, int position);

signals:
    void loaded();

public slots:
    void reload();
    void onFilterChanged(const QString& property);
    void onFilterInChanged(int delta);
    void onFilterOutChanged(int delta);

private:
    QList<QString> m_propertyNames;
    QmlMetadata* m_metadata;
    QmlFilter* m_filter;
    QList<int> m_keyframeCounts;
    QList<int> m_metadataIndex;

    int keyframeCount(int index) const;
    void updateNeighborsMinMax(int parameterIndex, int keyframeIndex);
};

#endif // KEYFRAMESMODEL_H
