/*
    * Copyright (c) 2002-2026 Gargoyle Software Inc.
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    * https://www.apache.org/licenses/LICENSE-2.0
    *
    * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.htmlunit.javascript.host.svg;
  
  import org.htmlunit.corejs.javascript.VarScope;
  import org.htmlunit.javascript.HtmlUnitScriptable;
  import org.htmlunit.javascript.JavaScriptEngine;
  import org.htmlunit.javascript.configuration.JsxClass;
  import org.htmlunit.javascript.configuration.JsxConstructor;
  import org.htmlunit.javascript.configuration.JsxFunction;
  import org.htmlunit.javascript.configuration.JsxGetter;
  import org.htmlunit.javascript.configuration.JsxSetter;
  import org.htmlunit.javascript.host.dom.DOMException;
  
  /**
   * JavaScript host object for {@code SVGMatrix}.
   *
   * @author Marc Guillemot
   * @author Ronald Brill
   *
   * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/SVGMatrix">MDN Documentation</a>
   */
  @JsxClass
  public class SVGMatrix extends HtmlUnitScriptable {
  
      private double shearX_;
      private double shearY_;
      private double scaleX_;
      private double scaleY_;
      private double translateX_;
      private double translateY_;
  
      /**
       * Creates an instance.
       */
      public SVGMatrix() {
          super();
  
          shearX_ = 0.0;
          shearY_ = 0.0;
          scaleX_ = 1.0;
          scaleY_ = 1.0;
          translateX_ = 0.0;
          translateY_ = 0.0;
      }
  
      /**
       * Creates an instance of this object.
       */
      @JsxConstructor
      public void jsConstructor() {
          // nothing to do
      }
  
      /**
       * Instantiates and configures the scope and prototype.
       *
       * @param scope the parent scope
       */
      public SVGMatrix(final VarScope scope) {
          this();
          setParentScope(scope);
          setPrototype(getPrototype(getClass()));
      }
  
      /**
       * Returns the {@code a} entry of the matrix.
       *
       * @return the field
       */
      @JsxGetter
      public double getA() {
          return scaleX_;
      }
  
      /**
       * Returns the {@code b} entry of the matrix.
       *
       * @return the field
       */
      @JsxGetter
      public double getB() {
          return shearY_;
      }
  
      /**
       * Returns the {@code c} entry of the matrix.
      *
      * @return the field
      */
     @JsxGetter
     public double getC() {
         return shearX_;
     }
 
     /**
      * Returns the {@code d} entry of the matrix.
      *
      * @return the field
      */
     @JsxGetter
     public double getD() {
         return scaleY_;
     }
 
     /**
      * Returns the {@code e} entry of the matrix.
      *
      * @return the field
      */
     @JsxGetter
     public double getE() {
         return translateX_;
     }
 
     /**
      * Returns the {@code f} entry of the matrix.
      *
      * @return the field
      */
     @JsxGetter
     public double getF() {
         return translateY_;
     }
 
     /**
      * Sets the {@code a} entry of the matrix.
      *
      * @param newValue the new value for the field
      */
     @JsxSetter
     public void setA(final double newValue) {
         scaleX_ = newValue;
     }
 
     /**
      * Sets the {@code b} entry of the matrix.
      *
      * @param newValue the new value for the field
      */
     @JsxSetter
     public void setB(final double newValue) {
         shearY_ = newValue;
     }
 
     /**
      * Sets the {@code c} entry of the matrix.
      *
      * @param newValue the new value for the field
      */
     @JsxSetter
     public void setC(final double newValue) {
         shearX_ = newValue;
     }
 
     /**
      * Sets the {@code d} entry of the matrix.
      *
      * @param newValue the new value for the field
      */
     @JsxSetter
     public void setD(final double newValue) {
         scaleY_ = newValue;
     }
 
     /**
      * Sets the {@code e} entry of the matrix.
      *
      * @param newValue the new value for the field
      */
     @JsxSetter
     public void setE(final double newValue) {
         translateX_ = newValue;
     }
 
     /**
      * Sets the {@code f} entry of the matrix.
      *
      * @param newValue the new value for the field
      */
     @JsxSetter
     public void setF(final double newValue) {
         translateY_ = newValue;
     }
 
     /**
      * Returns a new matrix that is the result of flipping this matrix along the x-axis.
      *
      * @return the resulting matrix
      */
     @JsxFunction
     public SVGMatrix flipX() {
         final SVGMatrix result = new SVGMatrix(getParentScope());
         result.shearX_ = shearX_;
         result.shearY_ = -shearY_;
         result.scaleX_ = -scaleX_;
         result.scaleY_ = scaleY_;
         result.translateX_ = translateX_;
         result.translateY_ = translateY_;
 
         return result;
     }
 
     /**
      * Returns a new matrix that is the result of flipping this matrix along the y-axis.
      *
      * @return the resulting matrix
      */
     @JsxFunction
     public SVGMatrix flipY() {
         final SVGMatrix result = new SVGMatrix(getParentScope());
         result.shearX_ = -shearX_;
         result.shearY_ = shearY_;
         result.scaleX_ = scaleX_;
         result.scaleY_ = -scaleY_;
         result.translateX_ = translateX_;
         result.translateY_ = translateY_;
 
         return result;
     }
 
     /**
      * Returns the inverse of this matrix.
      *
      * @return the resulting matrix
      */
     @JsxFunction
     public SVGMatrix inverse() {
         final double determinant = scaleX_ * scaleY_ - shearX_ * shearY_;
 
         if (Math.abs(determinant) < 1E-10) {
             throw JavaScriptEngine.asJavaScriptException(
                     getWindow(),
                     "Failed to execute 'inverse' on 'SVGMatrix': The matrix is not invertible.",
                     DOMException.INVALID_STATE_ERR);
         }
 
         final SVGMatrix result = new SVGMatrix(getParentScope());
         result.shearX_ = -shearX_ / determinant;
         result.shearY_ = -shearY_ / determinant;
         result.scaleX_ = scaleY_ / determinant;
         result.scaleY_ = scaleX_ / determinant;
         result.translateX_ = (shearX_ * translateY_ - scaleY_ * translateX_) / determinant;
         result.translateY_ = (shearY_ * translateX_ - scaleX_ * translateY_) / determinant;
 
         return result;
     }
 
     /**
      * Returns a new matrix that is the result of multiplying this matrix by the given matrix.
      *
      * @param by the matrix to multiply by
      * @return the resulting matrix
      */
     @JsxFunction
     public SVGMatrix multiply(final SVGMatrix by) {
         final SVGMatrix result = new SVGMatrix(getParentScope());
 
         result.shearX_ = by.shearX_ * scaleX_ + by.scaleY_ * shearX_;
         result.shearY_ = by.scaleX_ * shearY_ + by.shearY_ * scaleY_;
         result.scaleX_ = by.scaleX_ * scaleX_ + by.shearY_ * shearX_;
         result.scaleY_ = by.shearX_ * shearY_ + by.scaleY_ * scaleY_;
         result.translateX_ = by.translateX_ * scaleX_ + by.translateY_ * shearX_ + translateX_;
         result.translateY_ = by.translateX_ * shearY_ + by.translateY_ * scaleY_ + translateY_;
 
         return result;
     }
 
     /**
      * Returns a new matrix that is the result of rotating this matrix by the given angle.
      *
      * @param angle the rotation angle in degrees
      * @return the resulting matrix
      */
     @JsxFunction
     public SVGMatrix rotate(final double angle) {
         final double theta = Math.toRadians(angle);
         final double sin = Math.sin(theta);
         final double cos = Math.cos(theta);
 
         final SVGMatrix result = new SVGMatrix(getParentScope());
 
         result.shearX_ = -sin * scaleX_ + cos * shearX_;
         result.shearY_ = cos * shearY_ + sin * scaleY_;
         result.scaleX_ = cos * scaleX_ + sin * shearX_;
         result.scaleY_ = -sin * shearY_ + cos * scaleY_;
         result.translateX_ = translateX_;
         result.translateY_ = translateY_;
 
         return result;
     }
 
     /**
      * Returns a new matrix that is the result of rotating this matrix by the angle
      * defined by the given vector.
      *
      * @param x the x-coordinate of the vector
      * @param y the y-coordinate of the vector
      * @return the resulting matrix
      */
     @JsxFunction
     public SVGMatrix rotateFromVector(final double x, final double y) {
         if (x == 0 || y == 0) {
             throw JavaScriptEngine.asJavaScriptException(
                     getWindow(),
                     "Failed to execute 'rotateFromVector' on 'SVGMatrix': Arguments cannot be zero.",
                     DOMException.INVALID_ACCESS_ERR);
         }
 
         final double theta = Math.atan2(y, x);
         final double sin = Math.sin(theta);
         final double cos = Math.cos(theta);
 
         final SVGMatrix result = new SVGMatrix(getParentScope());
 
         result.shearX_ = -sin * scaleX_ + cos * shearX_;
         result.shearY_ = cos * shearY_ + sin * scaleY_;
         result.scaleX_ = cos * scaleX_ + sin * shearX_;
         result.scaleY_ = -sin * shearY_ + cos * scaleY_;
         result.translateX_ = translateX_;
         result.translateY_ = translateY_;
 
         return result;
     }
 
     /**
      * Returns a new matrix that is the result of scaling this matrix uniformly by the given factor.
      *
      * @param factor the scale factor
      * @return the resulting matrix
      */
     @JsxFunction
     public SVGMatrix scale(final double factor) {
         return scaleNonUniform(factor, factor);
     }
 
     /**
      * Returns a new matrix that is the result of scaling this matrix non-uniformly
      * by the given factors along each axis.
      *
      * @param factorX the scale factor along the x-axis
      * @param factorY the scale factor along the y-axis
      * @return the resulting matrix
      */
     @JsxFunction
     public SVGMatrix scaleNonUniform(final double factorX, final double factorY) {
         final SVGMatrix result = new SVGMatrix(getParentScope());
 
         result.shearX_ = factorY * shearX_;
         result.shearY_ = factorX * shearY_;
         result.scaleX_ = factorX * scaleX_;
         result.scaleY_ = factorY * scaleY_;
         result.translateX_ = translateX_;
         result.translateY_ = translateY_;
 
         return result;
     }
 
     /**
      * Returns a new matrix that is the result of skewing this matrix along the x-axis
      * by the given angle.
      *
      * @param angle the skew angle in degrees
      * @return the resulting matrix
      */
     @JsxFunction
     public SVGMatrix skewX(final double angle) {
         final double shear = Math.tan(Math.toRadians(angle));
 
         final SVGMatrix result = new SVGMatrix(getParentScope());
 
         result.shearX_ = shear * scaleX_ + shearX_;
         result.shearY_ = shearY_;
         result.scaleX_ = scaleX_;
         result.scaleY_ = shear * shearY_ + scaleY_;
         result.translateX_ = translateX_;
         result.translateY_ = translateY_;
 
         return result;
     }
 
     /**
      * Returns a new matrix that is the result of skewing this matrix along the y-axis
      * by the given angle.
      *
      * @param angle the skew angle in degrees
      * @return the resulting matrix
      */
     @JsxFunction
     public SVGMatrix skewY(final double angle) {
         final double shear = Math.tan(Math.toRadians(angle));
 
         final SVGMatrix result = new SVGMatrix(getParentScope());
 
         result.shearX_ = shearX_;
         result.shearY_ = shearY_ + shear * scaleY_;
         result.scaleX_ = scaleX_ + shear * shearX_;
         result.scaleY_ = scaleY_;
         result.translateX_ = translateX_;
         result.translateY_ = translateY_;
 
         return result;
     }
 
     /**
      * Returns a new matrix that is the result of translating this matrix by the given distances.
      *
      * @param x the distance to translate along the x-axis
      * @param y the distance to translate along the y-axis
      * @return the resulting matrix
      */
     @JsxFunction
     public SVGMatrix translate(final double x, final double y) {
         final SVGMatrix result = new SVGMatrix(getParentScope());
 
         result.shearX_ = shearX_;
         result.shearY_ = shearY_;
         result.scaleX_ = scaleX_;
         result.scaleY_ = scaleY_;
         result.translateX_ = x * scaleX_ + y * shearX_ + translateX_;
         result.translateY_ = x * shearY_ + y * scaleY_ + translateY_;
 
         return result;
     }
 }