/* 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.
 */

// Adapted to FaceTrackNoIR by Wim Vriend.

#pragma once

#include "spline.hpp"
#include "api/plugin-api.hpp"
#include "options/options.hpp"
using namespace options;

#include "export.hpp"

#include <QWidget>
#include <QRect>
#include <QPoint>
#include <QPointF>
#include <QToolTip>
#include <QShowEvent>
#include <QFocusEvent>
#include <QMetaObject>

#include <QDebug>

class OPENTRACK_SPLINE_EXPORT spline_widget final : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(QColor colorBezier READ colorBezier WRITE setColorBezier)
    Q_PROPERTY(bool is_preview_only READ is_preview_only WRITE set_preview_only)

    using points_t = spline::points_t;
public:
    spline_widget(QWidget *parent = 0);
    ~spline_widget();

    spline* config();
    void setConfig(spline* spl);

    QColor colorBezier() const;
    void setColorBezier(QColor color);

    void force_redraw();
    void set_preview_only(bool val);
    bool is_preview_only() const;
    void set_snap(double x, double y) { snap_x = x; snap_y = y; }
    void get_snap(double& x, double& y) const { x = snap_x; y = snap_y; }
protected slots:
    void paintEvent(QPaintEvent *e) override;
    void mousePressEvent(QMouseEvent *e) override;
    void mouseMoveEvent(QMouseEvent *e) override;
    void mouseReleaseEvent(QMouseEvent *e) override;
    void reload_spline();
private:
    void show_tooltip(const QPoint& pos, const QPointF& value = QPointF(0, 0), const QString& prefix = QStringLiteral(""));
    bool is_in_bounds(const QPoint& pos) const;

    void drawBackground();
    void drawFunction();
    void drawPoint(QPainter& painter, const QPointF& pt, const QColor& colBG, const QColor& border = QColor(50, 100, 120, 200));
    void drawLine(QPainter& painter, const QPoint& start, const QPoint& end, const QPen& pen);
    bool point_within_pixel(const QPointF& pt, const QPoint& pixel);

    void focusOutEvent(QFocusEvent*e) override;
    void resizeEvent(QResizeEvent *) override;
private:
    bool is_on_pt(const QPoint& pos, int* pt = nullptr);
    void update_range();
    QPointF pixel_coord_to_point(const QPoint& point);
    QPointF point_to_pixel(const QPointF& point);

    QPointF c;
    spline* _config;

    QPixmap _background;
    QPixmap _function;
    QColor spline_color;

    // bounds of the rectangle user can interact with
    QRect pixel_bounds;

    QMetaObject::Connection connection;

    double snap_x, snap_y;
    int moving_control_point_idx;
    bool _draw_function, _preview_only;

    static constexpr int line_length_pixels = 3;
    static constexpr int point_size = 4;
    static constexpr int point_closeness_limit = 7;
};