/* Copyright (c) 2012-2016, Stanislaw Halik <sthalik@misaki.pl>

 * Permission to use, copy, modify, and/or distribute this
 * software for any purpose with or without fee is hereby granted,
 * provided that the above copyright notice and this permission
 * notice appear in all copies.
 */

#pragma once

#include <QtGlobal>
#include <QList>
#include <QPointF>
#include <QString>
#include <QSettings>
#include <QMutex>
#include <vector>
#include <limits>
#include "compat/qcopyable-mutex.hpp"

#ifdef BUILD_spline_widget
#   define SPLINE_WIDGET_EXPORT Q_DECL_EXPORT
#else
#   define SPLINE_WIDGET_EXPORT Q_DECL_IMPORT
#endif

class SPLINE_WIDGET_EXPORT spline
{
private:
    int precision() const;
    void reload();
    float getValueInternal(int x);

    struct State
    {
        QList<QPointF> input;
        std::vector<float> data;
        bool operator==(const State& s) const;
    };

    MyMutex _mutex;
    QPointF last_input_value;
    State cur, saved;
    qreal max_x, max_y;
    volatile bool activep;

    static constexpr int value_count = 10000;
public:
    qreal maxInput() const;
    qreal maxOutput() const;
    spline();
    spline(qreal maxx, qreal maxy);

    float getValue(float x);
    bool getLastPoint(QPointF& point);
    void removePoint(int i);
    void removeAllPoints();

    void addPoint(QPointF pt);
    void movePoint(int idx, QPointF pt);
    const QList<QPointF> getPoints();
    void setMaxInput(qreal MaxInput);
    void setMaxOutput(qreal MaxOutput);

    void saveSettings(QSettings& settings, const QString& title);
    void loadSettings(QSettings& settings, const QString& title);
    void invalidate_unsaved_settings();

    void setTrackingActive(bool blnActive);
};