/*
    * 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.canvas;
  
  import org.htmlunit.corejs.javascript.Context;
  import org.htmlunit.corejs.javascript.Function;
  import org.htmlunit.corejs.javascript.ScriptableObject;
  import org.htmlunit.corejs.javascript.VarScope;
  import org.htmlunit.corejs.javascript.typedarrays.NativeArrayBuffer;
  import org.htmlunit.corejs.javascript.typedarrays.NativeUint8ClampedArray;
  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.JsxGetter;
  import org.htmlunit.javascript.host.dom.DOMException;
  import org.htmlunit.platform.canvas.rendering.RenderingBackend;
  
  /**
   * A JavaScript object for {@code ImageData}.
   *
   * @author Ahmed Ashour
   * @author Ronald Brill
   *
   * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/ImageData">MDN Documentation</a>
   */
  @JsxClass
  public class ImageData extends HtmlUnitScriptable {
  
      private final byte[] bytes_;
      private final int width_;
      private final int height_;
      private NativeUint8ClampedArray data_;
  
      /**
       * Default constructor.
       */
      public ImageData() {
          this(null, 0, 0, 0, 0);
      }
  
      /**
       * JavaScript constructor.
       * @param cx the current context
       * @param scope the scope
       * @param args the arguments to the ImageData constructor
       * @param ctorObj the function object
       * @param inNewExpr {@code true} if invoked with the {@code new} operator
       * @return the Java object that JavaScript can access
       */
      @JsxConstructor
      public static ImageData jsConstructor(final Context cx, final VarScope scope,
              final Object[] args, final Function ctorObj, final boolean inNewExpr) {
          if (args.length < 2) {
              throw JavaScriptEngine.typeError("ImageData ctor - too less arguments");
          }
  
          NativeUint8ClampedArray data = null;
          final int width;
          final int height;
          if (args[0] instanceof NativeUint8ClampedArray array) {
              data = array;
              if (data.getArrayLength() % 4 != 0) {
                  throw JavaScriptEngine.asJavaScriptException(
                          (HtmlUnitScriptable) getTopLevelScope(scope).getGlobalThis(),
                          "ImageData ctor - data length mod 4 not zero",
                          DOMException.INVALID_STATE_ERR);
              }
  
              width = (int) JavaScriptEngine.toInteger(args[1]);
              if (args.length < 3) {
                  height = data.getArrayLength() / 4 / width;
  
                  if (data.getArrayLength() != 4 * width * height) {
                      throw JavaScriptEngine.asJavaScriptException(
                              (HtmlUnitScriptable) getTopLevelScope(scope).getGlobalThis(),
                              "ImageData ctor - width not correct",
                              DOMException.INDEX_SIZE_ERR);
                  }
              }
              else {
                  height = (int) JavaScriptEngine.toInteger(args[2]);
              }
  
              if (data.getArrayLength() != 4 * width * height) {
                  throw JavaScriptEngine.asJavaScriptException(
                          (HtmlUnitScriptable) getTopLevelScope(scope).getGlobalThis(),
                         "ImageData ctor - width/height not correct",
                         DOMException.INDEX_SIZE_ERR);
             }
         }
         else {
             width = (int) JavaScriptEngine.toInteger(args[0]);
             height = (int) JavaScriptEngine.toInteger(args[1]);
         }
 
         if (width < 0) {
             throw JavaScriptEngine.asJavaScriptException(
                     (HtmlUnitScriptable) getTopLevelScope(scope).getGlobalThis(),
                     "ImageData ctor - width negative",
                     DOMException.INDEX_SIZE_ERR);
         }
         if (height < 0) {
             throw JavaScriptEngine.asJavaScriptException(
                     (HtmlUnitScriptable) getTopLevelScope(scope).getGlobalThis(),
                     "ImageData ctor - height negative",
                     DOMException.INDEX_SIZE_ERR);
         }
 
         final ImageData result = new ImageData(null, 0, 0, width, height);
         if (data != null) {
             final byte[] bytes = data.getBuffer().getBuffer();
             System.arraycopy(bytes, 0, result.bytes_, 0, Math.min(bytes.length, result.bytes_.length));
         }
         return result;
     }
 
     ImageData(final RenderingBackend context, final int x, final int y, final int width, final int height) {
         super();
         if (context == null) {
             bytes_ = new byte[width * height * 4];
         }
         else {
             bytes_ = context.getBytes(width, height, x, y);
         }
 
         width_ = width;
         height_ = height;
     }
 
     /**
      * Returns the {@code width} property.
      * @return the {@code width} property
      */
     @JsxGetter
     public int getWidth() {
         return width_;
     }
 
     /**
      * Returns the {@code height} property.
      * @return the {@code height} property
      */
     @JsxGetter
     public int getHeight() {
         return height_;
     }
 
     /**
      * Returns a {@link NativeUint8ClampedArray} representing a one-dimensional array containing
      * the data in the RGBA order, with integer values between 0 and 255 (included).
      * @return the {@code data} property
      */
     @JsxGetter
     public NativeUint8ClampedArray getData() {
         if (data_ == null) {
             final NativeArrayBuffer arrayBuffer = new NativeArrayBuffer(bytes_.length);
             System.arraycopy(bytes_, 0, arrayBuffer.getBuffer(), 0, bytes_.length);
 
             data_ = new NativeUint8ClampedArray(arrayBuffer, 0, bytes_.length);
             data_.setParentScope(getParentScope());
             data_.setPrototype(ScriptableObject.getClassPrototype(getParentScope(), data_.getClassName()));
         }
 
         return data_;
     }
 
 }