/* -*- C++ -*-
 *
 *  This file is part of RawTherapee.
 *
 *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
 *
 *  RawTherapee 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.
 *
 *  RawTherapee 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 RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
 */
#pragma once

#include "../rtengine/LUT.h"
#include "cursormanager.h"
#include "curvelistener.h"
#include "mycurve.h"
#include <gtkmm.h>
#include <vector>

// For compatibility and simplicity reason, order shouldn't change, and must be
// identical to the order specified in the curveType widget
enum DiagonalCurveType {
    DCT_Empty = -1, // Also used for identity curves
    DCT_Linear,     // 0
    DCT_Spline,     // 1
    DCT_Parametric, // 2
    DCT_NURBS,      // 3
    DCT_CatmullRom, // 4
    // Insert new curve type above this line
    DCT_Unchanged // Must remain the last of the enum
};

class DiagonalCurveDescr {

public:
    DiagonalCurveType type;
    std::vector<double> x,
        y; // in case of parametric curves the curve parameters are stored in
           // vector x. In other cases these vectors store the coordinates of
           // the bullets.
};

class CurveBackgroundProvider {
public:
    virtual ~CurveBackgroundProvider() = default;
    virtual void renderCurveBackground(int caller_id,
                                       Glib::RefPtr<Gtk::StyleContext> style,
                                       Cairo::RefPtr<Cairo::Context> cr,
                                       double x, double y, double w,
                                       double h) = 0;
};

class MyDiagonalCurve: public MyCurve {
private:
    IdleRegister idle_register;

protected:
    DiagonalCurveDescr curve;
    int grab_point;    // the point that the user is moving by mouse
    int closest_point; // the point that is the closest from the cursor
    int lit_point;     // the point that is lit when the cursor is near it
    double clampedX;   // clamped grabbed point X coordinates in the [0;1] range
    double clampedY;   // clamped grabbed point Y coordinates in the [0;1] range
    double deltaX;    // signed X distance of the cursor between two consecutive
                      // MOTION_NOTIFY
    double deltaY;    // signed Y distance of the cursor between two consecutive
                      // MOTION_NOTIFY
    double distanceX; // X distance from the cursor to the closest point
    double distanceY; // Y distance from the cursor to the closest point
    double ugpX;      // unclamped grabbed point X coordinate in the graph
    double ugpY;      // unclamped grabbed point Y coordinate in the graph
    int activeParam;
    unsigned int *bghist; // histogram values
    bool bghistvalid;
    CurveBackgroundProvider *bp_;
    int bp_id_;

    void draw(int handle);
    void interpolate();
    void findClosestPoint();
    CursorShape motionNotify(CursorShape type, double minDistanceX,
                             double minDistanceY, int num);
    std::vector<double> get_vector(int veclen) override;
    void get_LUT(LUTf &lut);
    // Get the cursor position and unclamped position from the curve given an X
    // value ; BEWARE: can be time consuming, use with care
    void getCursorPositionFromCurve(float x);
    void getCursorPositionFromCurve(int x);
    // Get the cursor position and unclamped value depending on cursor's
    // position in the graph
    void getCursorPosition(Gdk::EventType evType, bool isHint, int evX, int evY,
                           Gdk::ModifierType modifierKey);

public:
    MyDiagonalCurve();
    ~MyDiagonalCurve() override;
    std::vector<double> getPoints() override;
    void setPoints(const std::vector<double> &p) override;
    void setType(DiagonalCurveType t);
    bool on_draw(const ::Cairo::RefPtr<Cairo::Context> &cr) override;
    bool handleEvents(GdkEvent *event) override;
    void setActiveParam(int ac);
    void reset(const std::vector<double> &resetCurve,
               double identityValue = 0.5) override;
    void updateBackgroundHistogram(LUTu &hist);

    void pipetteMouseOver(CurveEditor *ce, EditDataProvider *provider,
                          int modifierKey) override;
    bool pipetteButton1Pressed(EditDataProvider *provider,
                               int modifierKey) override;
    void pipetteButton1Released(EditDataProvider *provider) override;
    void pipetteDrag(EditDataProvider *provider, int modifierKey) override;

    void setPos(double pos, int chanIdx) override;
    void stopNumericalAdjustment() override;

    void setBackgroundProvider(CurveBackgroundProvider *bp, int caller_id);
};
