/*
    * 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.html;
  
  import static org.htmlunit.BrowserVersionFeatures.JS_CANVAS_DATA_URL_CHROME_PNG;
  
  import org.htmlunit.html.HtmlCanvas;
  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.canvas.CanvasRenderingContext2D;
  
  /**
   * The JavaScript object {@code HTMLCanvasElement}.
   *
   * @author Ahmed Ashour
   * @author Ronald Brill
   * @author Frank Danek
   *
   * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement">MDN Documentation</a>
   */
  @JsxClass(domClass = HtmlCanvas.class)
  public class HTMLCanvasElement extends HTMLElement {
  
      private CanvasRenderingContext2D context2d_;
  
      /**
       * JavaScript constructor.
       */
      @Override
      @JsxConstructor
      public void jsConstructor() {
          super.jsConstructor();
      }
  
      /**
       * Returns the {@code width} property.
       * @return the {@code width} property
       */
      @JsxGetter
      public int getWidth() {
          final String value = getDomNodeOrDie().getAttributeDirect("width");
          final Integer intValue = getValue(value);
          if (intValue != null) {
              return intValue;
          }
          return 300;
      }
  
      static Integer getValue(final String value) {
          int index = -1;
          while (index + 1 < value.length() && Character.isDigit(value.charAt(index + 1))) {
              index++;
          }
          if (index != -1) {
              return Integer.parseInt(value.substring(0, index + 1));
          }
          return null;
      }
  
      /**
       * Sets the {@code width} property.
       * @param width the {@code width} property value
       */
      @JsxSetter
      public void setWidth(final int width) {
          getDomNodeOrDie().setAttribute("width", Integer.toString(width));
      }
  
      /**
       * Returns the {@code height} property.
       * @return the {@code height} property
       */
      @JsxGetter
      public int getHeight() {
          final String value = getDomNodeOrDie().getAttributeDirect("height");
          final Integer intValue = getValue(value);
          if (intValue != null) {
              return intValue;
          }
          return 150;
      }
  
     /**
      * Sets the {@code height} property.
      * @param height the {@code height} property value
      */
     @JsxSetter
     public void setHeight(final int height) {
         getDomNodeOrDie().setAttribute("height", Integer.toString(height));
     }
 
     /**
      * Gets the context.
      * @param contextId the context id
      * @return an object that exposes an API for drawing on the canvas,
      *         or null if the given context ID is not supported
      */
     @JsxFunction
     public HtmlUnitScriptable getContext(final String contextId) {
         if ("2d".equals(contextId)) {
             if (context2d_ == null) {
                 final CanvasRenderingContext2D context = new CanvasRenderingContext2D(this);
                 context.setParentScope(getParentScope());
                 context.setPrototype(getPrototype(context.getClass()));
                 context2d_ = context;
             }
             return context2d_;
         }
         return null;
     }
 
     /**
      * Gets the data: URL representation of the canvas element.
      * Here we return an empty image.
      * @param type the type (optional)
      * @return the data URL
      */
     @JsxFunction
     public String toDataURL(final Object type) {
         if (context2d_ != null) {
             final String typeInUse;
             if (JavaScriptEngine.isUndefined(type)) {
                 typeInUse = null;
             }
             else {
                 typeInUse = JavaScriptEngine.toString(type);
             }
             return context2d_.toDataURL(typeInUse);
         }
 
         if (getBrowserVersion().hasFeature(JS_CANVAS_DATA_URL_CHROME_PNG)) {
             return "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASwAAACWCAYAAABkW7XSAAAEYklEQVR4Xu3UAQkAAAwCwdm/"
                 + "9HI83BLIOdw5AgQIRAQWySkmAQIEzmB5AgIEMgIGK1OVoAQIGCw/QIBARsBgZaoSlAABg+UHCBDICBisTFWCEiBgsPwAAQIZAYO"
                 + "VqUpQAgQMlh8gQCAjYLAyVQlKgIDB8gMECGQEDFamKkEJEDBYfoAAgYyAwcpUJSgBAgbLDxAgkBEwWJmqBCVAwGD5AQIEMgIGK1"
                 + "OVoAQIGCw/QIBARsBgZaoSlAABg+UHCBDICBisTFWCEiBgsPwAAQIZAYOVqUpQAgQMlh8gQCAjYLAyVQlKgIDB8gMECGQEDFamK"
                 + "kEJEDBYfoAAgYyAwcpUJSgBAgbLDxAgkBEwWJmqBCVAwGD5AQIEMgIGK1OVoAQIGCw/QIBARsBgZaoSlAABg+UHCBDICBisTFWC"
                 + "EiBgsPwAAQIZAYOVqUpQAgQMlh8gQCAjYLAyVQlKgIDB8gMECGQEDFamKkEJEDBYfoAAgYyAwcpUJSgBAgbLDxAgkBEwWJmqBCV"
                 + "AwGD5AQIEMgIGK1OVoAQIGCw/QIBARsBgZaoSlAABg+UHCBDICBisTFWCEiBgsPwAAQIZAYOVqUpQAgQMlh8gQCAjYLAyVQlKgI"
                 + "DB8gMECGQEDFamKkEJEDBYfoAAgYyAwcpUJSgBAgbLDxAgkBEwWJmqBCVAwGD5AQIEMgIGK1OVoAQIGCw/QIBARsBgZaoSlAABg"
                 + "+UHCBDICBisTFWCEiBgsPwAAQIZAYOVqUpQAgQMlh8gQCAjYLAyVQlKgIDB8gMECGQEDFamKkEJEDBYfoAAgYyAwcpUJSgBAgbL"
                 + "DxAgkBEwWJmqBCVAwGD5AQIEMgIGK1OVoAQIGCw/QIBARsBgZaoSlAABg+UHCBDICBisTFWCEiBgsPwAAQIZAYOVqUpQAgQMlh8"
                 + "gQCAjYLAyVQlKgIDB8gMECGQEDFamKkEJEDBYfoAAgYyAwcpUJSgBAgbLDxAgkBEwWJmqBCVAwGD5AQIEMgIGK1OVoAQIGCw/QI"
                 + "BARsBgZaoSlAABg+UHCBDICBisTFWCEiBgsPwAAQIZAYOVqUpQAgQMlh8gQCAjYLAyVQlKgIDB8gMECGQEDFamKkEJEDBYfoAAg"
                 + "YyAwcpUJSgBAgbLDxAgkBEwWJmqBCVAwGD5AQIEMgIGK1OVoAQIGCw/QIBARsBgZaoSlAABg+UHCBDICBisTFWCEiBgsPwAAQIZ"
                 + "AYOVqUpQAgQMlh8gQCAjYLAyVQlKgIDB8gMECGQEDFamKkEJEDBYfoAAgYyAwcpUJSgBAgbLDxAgkBEwWJmqBCVAwGD5AQIEMgI"
                 + "GK1OVoAQIGCw/QIBARsBgZaoSlAABg+UHCBDICBisTFWCEiBgsPwAAQIZAYOVqUpQAgQMlh8gQCAjYLAyVQlKgIDB8gMECGQEDF"
                 + "amKkEJEDBYfoAAgYyAwcpUJSgBAgbLDxAgkBEwWJmqBCVAwGD5AQIEMgIGK1OVoAQIGCw/QIBARsBgZaoSlACBB1YxAJfjJb2jA"
                 + "AAAAElFTkSuQmCC";
         }
 
         return "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASwAAACWCAYAAABkW7XSAAAAxUlEQVR4nO3BMQEAAADCoPVPbQhf"
             + "oAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
             + "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
             + "AAAAAAAAAAAAAAAAAAAAAAAAAAAOA1v9QAATX68/0AAAAASUVORK5CYII=";
     }
 }