/*
 *  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/>.
 */
#ifndef _MYFLATCURVE_
#define _MYFLATCURVE_

#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 FlatCurveType {
    FCT_Empty = -1,    // Also used for identity curves
    FCT_Linear,        // 0
    FCT_MinMaxCPoints, // 1
    // FCT_Parametric,   // 2
    //  Insert new curve type above this line
    FCT_Unchanged // Must remain the last of the enum
};

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: public MyCurve {

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;

    void draw();
    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;
};

#endif
