/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2007 QMUL.
    
    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.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef SV_ALIGNMENT_MODEL_H
#define SV_ALIGNMENT_MODEL_H

#include "Model.h"
#include "Path.h"
#include "base/RealTime.h"

#include <QString>
#include <QStringList>

class SparseTimeValueModel;

class AlignmentModel : public Model
{
    Q_OBJECT

public:
    AlignmentModel(ModelId reference /* any model */,
                   ModelId aligned /* any model */,
                   ModelId path /* a SparseTimeValueModel */);
    ~AlignmentModel();

    bool isOK() const override;

    void setError(QString error) { m_error = error; }
    QString getError() const { return m_error; }

    sv_frame_t getStartFrame() const override;
    sv_frame_t getTrueEndFrame() const override;
    sv_samplerate_t getSampleRate() const override;
    bool isReady(int *completion = 0) const override;
    int getCompletion() const override {
        int c = 0;
        (void)isReady(&c);
        return c;
    }
    const ZoomConstraint *getZoomConstraint() const override;

    QString getTypeName() const override { return tr("Alignment"); }

    ModelId getReferenceModel() const;
    ModelId getAlignedModel() const;

    sv_frame_t toReference(sv_frame_t frame) const;
    sv_frame_t fromReference(sv_frame_t frame) const;

    void setPathFrom(ModelId pathSource); // a SparseTimeValueModel
    void setPath(const Path &path);

    /**
     * Set the calculated pitch relative to a reference. This is
     * purely metadata.
     */
    void setRelativePitch(int cents) { m_relativePitch = cents; }

    /**
     * Get the value set with setRelativePitch.
     */
    int getRelativePitch() const { return m_relativePitch; }

    void toXml(QTextStream &stream,
               QString indent = "",
               QString extraAttributes = "") const override;

    QVector<QString>
    getStringExportHeaders(DataExportOptions) const override {
        return {};
    }

    QVector<QVector<QString>>
    toStringExportRows(DataExportOptions, sv_frame_t, sv_frame_t) const override {
        return {};
    }

signals:
    void completionChanged(ModelId);

protected slots:
    void pathSourceChangedWithin(ModelId, sv_frame_t startFrame, sv_frame_t endFrame);
    void pathSourceCompletionChanged(ModelId);

protected:
    ModelId m_reference;
    ModelId m_aligned;

    ModelId m_pathSource; // a SparseTimeValueModel, which we need a
                          // handle on only while it's still being generated

    mutable std::unique_ptr<Path> m_path;
    mutable std::unique_ptr<Path> m_reversePath;
    bool m_pathBegun;
    bool m_pathComplete;
    QString m_error;
    int m_relativePitch;

    void constructPath() const;
    void constructReversePath() const;

    sv_frame_t performAlignment(const Path &path, sv_frame_t frame) const;
};

#endif
