/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2022 Osimis S.A., Belgium
 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 **/


#pragma once

#include "../StoneEnumerations.h"
#include "LinearAlgebra.h"

#include <Images/ImageAccessor.h>

namespace OrthancStone
{
  class AffineTransform2D
  {
  private:
    Matrix  matrix_;

  public:
    AffineTransform2D();  // Create the identity transform

    // The matrix must be 3x3, without perspective effects
    explicit AffineTransform2D(const Matrix& m);

    AffineTransform2D(const AffineTransform2D& other) :
      matrix_(other.matrix_)
    {
    }
    
    const Matrix& GetHomogeneousMatrix() const
    {
      return matrix_;
    }

    void Apply(double& x /* inout */,
               double& y /* inout */) const;

    void Apply(Orthanc::ImageAccessor& target,
               const Orthanc::ImageAccessor& source,
               ImageInterpolation interpolation,
               bool clear) const;

    void ConvertToOpenGLMatrix(float target[16],
                               unsigned int canvasWidth,
                               unsigned int canvasHeight) const;

    double ComputeZoom() const;
    
    static AffineTransform2D Invert(const AffineTransform2D& a);

    static AffineTransform2D Combine(const AffineTransform2D& a,
                                     const AffineTransform2D& b);
      
    static AffineTransform2D Combine(const AffineTransform2D& a,
                                     const AffineTransform2D& b,
                                     const AffineTransform2D& c);
      
    static AffineTransform2D Combine(const AffineTransform2D& a,
                                     const AffineTransform2D& b,
                                     const AffineTransform2D& c,
                                     const AffineTransform2D& d);

    // transformations are applied right to left: 
    // `e` is the first transformation applied and `a` is the last one
    static AffineTransform2D Combine(const AffineTransform2D& a,
                                     const AffineTransform2D& b,
                                     const AffineTransform2D& c,
                                     const AffineTransform2D& d,
                                     const AffineTransform2D& e);

    static AffineTransform2D CreateOffset(double dx,
                                          double dy);

    static AffineTransform2D CreateScaling(double sx,
                                           double sy);

    static AffineTransform2D CreateRotation(double angle); // CW rotation in radians

    static AffineTransform2D CreateRotation(double angle, // CW rotation in radians
                                            double cx,    // rotation center
                                            double cy);   // rotation center

    static AffineTransform2D CreateOpenGLClipspace(unsigned int canvasWidth,
                                                   unsigned int canvasHeight);

    static AffineTransform2D CreateFlip(bool flipX,
                                        bool flipY,
                                        unsigned int width,
                                        unsigned int height);

    static AffineTransform2D CreateFlipX();

    static AffineTransform2D CreateFlipY();
  };
}