/*
 *  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 <https://www.gnu.org/licenses/>.
 */
#pragma once

#include <vector>

#include <gtkmm.h>

#include "cursormanager.h"
#include "curvelistener.h"
#include "mycurve.h"
#include "rtengine/flatcurvetypes.h"

enum MouseOverAreas {
    FCT_Area_None       = 1 << 0,   // over a zone that don't have any
    FCT_Area_Insertion  = 1 << 1,   // where the user can insert a new point
    FCT_Area_Point      = 1 << 2,   // over an existing point
    FCT_Area_H          = 1 << 3,   // cursor is on the horizontal line going through the edited control point
    FCT_Area_V          = 1 << 4,   // cursor is on the vertical   line going through the edited control point
    FCT_Area_LeftTan    = 1 << 5,   // in the left tangent edition area
    FCT_Area_RightTan   = 1 << 6    // in the right tangent edition area
};

enum EditedHandle {
    FCT_EditedHandle_None     = 1 << 0,
    FCT_EditedHandle_CPointUD = 1 << 1, // UD stands for Unknown Direction
    FCT_EditedHandle_CPoint   = 1 << 2,
    FCT_EditedHandle_CPointX  = 1 << 3,
    FCT_EditedHandle_CPointY  = 1 << 4,
    FCT_EditedHandle_LeftTan  = 1 << 5,
    FCT_EditedHandle_RightTan = 1 << 6
};

class FlatCurveDescr
{

public:
    FlatCurveType type;
    std::vector<double> x,              // Range: [0.0 - 1.0]
        y,              // Range: [0.0 - 1.0], default value = 0.5
        leftTangent,    // Range: [0.0 - 1.0], where 1.0 = distance from previous to this point
        rightTangent;   // Range: [0.0 - 1.0], where 1.0 = distance from this to next point
};

class HandlePosition
{

public:
    double centerX;
    double centerY;
};

class MyFlatCurve final : public MyCurve
{
private:
    IdleRegister idle_register;

protected:
    FlatCurveDescr curve;
    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
    double leftTanX;    // X position of the left tangent handle
    double rightTanX;   // X position of the right tangent handle
    double preciseCursorX;      // X coordinate in the graph of the cursor, as a double value
    double preciseCursorY;      // Y coordinate in the graph of the cursor, as a double value
    double minDistanceX;        // X minimal distance before point suppression
    double minDistanceY;        // Y minimal distance before point suppression
    double deletedPointX;       // Backup of the X value of the edited point, when deleted while being dragged
    HandlePosition leftTanHandle;   // XY coordinate if the upper left and bottom right corner of the left tangent handle
    HandlePosition rightTanHandle;  // XY coordinate if the upper left and bottom right corner of the right tangent handle
    bool tanHandlesDisplayed;   // True if the tangent handles are displayed
    bool periodic;          // Flat curves are periodic by default
    enum EditedHandle editedHandle;
    bool draggingElement;
    enum MouseOverAreas area;
    double locallabRef; // Locallab reference value to display in the background

    void updateDrawingArea (const ::Cairo::RefPtr< Cairo::Context> &cr);
    void movePoint(bool moveX, bool moveY, bool pipetteDrag = false);
    void defaultCurve (double iVal = 0.5);
    void interpolate ();
    void getCursorPosition(Gdk::EventType evType, bool isHint, int evX, int evY, Gdk::ModifierType modifier);
    void getMouseOverArea ();
    bool getHandles(int n);
    CursorShape motionNotify(CursorShape type, double minDistanceX, double minDistanceY, int num);
    std::vector<double> get_vector (int veclen) override;
    void get_LUT (LUTf &lut);

public:
    MyFlatCurve ();
    //~MyFlatCurve ();
    std::vector<double> getPoints () override;
    void setPeriodicity (bool isPeriodic)
    {
        periodic = isPeriodic;
    };
    void setPoints (const std::vector<double>& p) override;
    void setType (FlatCurveType t);
    bool on_draw(const ::Cairo::RefPtr< Cairo::Context> &cr) override;
    bool handleEvents (GdkEvent* event) override;
    void reset (const std::vector<double> &resetCurve, double identityValue = 0.5) override;
    //void updateBackgroundHistogram (unsigned int* 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 updateLocallabBackground(double ref);
};