/* 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 "compat/qcopyable-mutex.hpp"
#include "options/options.hpp"
using namespace options;

#include "export.hpp"

#include <vector>
#include <limits>
#include <memory>

#include <QObject>
#include <QPointF>
#include <QString>
#include <QMetaObject>

namespace spline_detail {

class OPENTRACK_SPLINE_EXPORT settings final : public QObject
{
    Q_OBJECT
public:
    bundle b;
    value<QList<QPointF>> points;
    settings(bundle b);
signals:
    void recomputed() const;
};

}

class OPENTRACK_SPLINE_EXPORT spline final
{
    int precision(const QList<QPointF>& points) const;
    void update_interp_data();
    float getValueInternal(int x);
    void add_lone_point();
    static bool sort_fn(const QPointF& one, const QPointF& two);

    static QPointF ensure_in_bounds(const QList<QPointF>& points, int i);

    template<typename t, typename u, typename w>
    static inline auto clamp(t val, u min, w max) -> decltype (val * min * max)
    {
        if (val > max)
            return max;
        if (val < min)
            return min;
        return val;
    }

    mem<spline_detail::settings> s;
    QMetaObject::Connection connection;

    std::vector<float> data;
    using interp_data_t = decltype(data);

    static constexpr int value_count = 10000;

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

public:
    using settings = spline_detail::settings;

    void reload();
    void save(QSettings& s);
    void save();
    void set_bundle(bundle b);

    qreal maxInput() const;
    qreal maxOutput() const;
    spline();
    spline(qreal maxx, qreal maxy, const QString& name);
    ~spline();

    spline& operator=(const spline&) = default;
    spline(const spline&) = default;

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

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

    void setTrackingActive(bool blnActive);
    bundle get_bundle();
    void recompute();

    mem<settings> get_settings();
    mem<const settings> get_settings() const;

    using points_t = decltype(s->points.get());
};