/*
    * Copyright (c) 2002-2025 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.html;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.net.URL;
  import java.nio.file.Files;
  import java.util.Map;
  
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.lang3.StringUtils;
  import org.htmlunit.BrowserVersion;
  import org.htmlunit.ElementNotFoundException;
  import org.htmlunit.Page;
  import org.htmlunit.SgmlPage;
  import org.htmlunit.WebClient;
  import org.htmlunit.WebRequest;
  import org.htmlunit.WebResponse;
  import org.htmlunit.javascript.host.event.Event;
  import org.htmlunit.util.NameValuePair;
  
  /**
   * Wrapper for the HTML element "input".
   * HtmlUnit does not download the associated image for performance reasons.
   *
   * @author <a href="mailto:mbowler@GargoyleSoftware.com">Mike Bowler</a>
   * @author David K. Taylor
   * @author <a href="mailto:cse@dynabean.de">Christian Sell</a>
   * @author Marc Guillemot
   * @author Daniel Gredler
   * @author Ahmed Ashour
   * @author Ronald Brill
   * @author Frank Danek
   */
  public class HtmlImageInput extends HtmlInput implements LabelableElement {
  
      // For click with x, y position.
      private boolean wasPositionSpecified_;
      private int xPosition_;
      private int yPosition_;
      private WebResponse imageWebResponse_;
      private boolean downloaded_;
  
      /**
       * Creates an instance.
       *
       * @param qualifiedName the qualified name of the element type to instantiate
       * @param page the page that contains this element
       * @param attributes the initial attributes
       */
      HtmlImageInput(final String qualifiedName, final SgmlPage page, final Map<String, DomAttr> attributes) {
          super(qualifiedName, page, attributes);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public NameValuePair[] getSubmitNameValuePairs() {
          final String name = getNameAttribute();
          final String prefix;
          // a clicked image without name sends parameter x and y
          if (StringUtils.isEmpty(name)) {
              prefix = "";
          }
          else {
              prefix = name + ".";
          }
  
          if (wasPositionSpecified_) {
              final NameValuePair valueX = new NameValuePair(prefix + 'x', Integer.toString(xPosition_));
              final NameValuePair valueY = new NameValuePair(prefix + 'y', Integer.toString(yPosition_));
              return new NameValuePair[] {valueX, valueY};
          }
          return new NameValuePair[]{new NameValuePair(getNameAttribute(), getRawValue())};
      }
  
      /**
       * Submit the form that contains this input. Only a couple of the inputs
       * support this method so it is made protected here. Those subclasses
       * that wish to expose it will override and make it public.
       *
       * @return the Page that is the result of submitting this page to the server
       * @exception IOException If an IO error occurs
      */
     @Override
     @SuppressWarnings("unchecked")
     public Page click() throws IOException {
         return click(0, 0);
     }
 
     /**
      * {@inheritDoc}
      * @throws IOException if an IO error occurred
      */
     @Override
     protected boolean doClickStateUpdate(final boolean shiftKey, final boolean ctrlKey) throws IOException {
         final HtmlForm form = getEnclosingForm();
         if (form != null) {
             form.submit(this);
             return false;
         }
         super.doClickStateUpdate(shiftKey, ctrlKey);
         return false;
     }
 
     /**
      * Simulate clicking this input with a pointing device. The x and y coordinates
      * of the pointing device will be sent to the server.
      *
      * @param <P> the page type
      * @param x the x coordinate of the pointing device at the time of clicking
      * @param y the y coordinate of the pointing device at the time of clicking
      * @return the page that is loaded after the click has taken place
      * @exception IOException If an IO error occurs
      * @exception ElementNotFoundException If a particular XML element could not be found in the DOM model
      */
     public <P extends Page> P click(final int x, final int y) throws IOException, ElementNotFoundException {
         wasPositionSpecified_ = true;
         xPosition_ = x;
         yPosition_ = y;
         return super.click();
     }
 
     /**
      * <span style="color:red">INTERNAL API - SUBJECT TO CHANGE AT ANY TIME - USE AT YOUR OWN RISK.</span><br>
      *
      * Simulates clicking on this element, returning the page in the window that has the focus
      * after the element has been clicked. Note that the returned page may or may not be the same
      * as the original page, depending on the type of element being clicked, the presence of JavaScript
      * action listeners, etc.
      *
      * @param event the click event used
      * @param <P> the page type
      * @return the page contained in the current window as returned by
      *         {@link org.htmlunit.WebClient#getCurrentWindow()}
      * @exception IOException if an IO error occurs
      */
     @Override
     public <P extends Page> P click(final Event event,
             final boolean shiftKey, final boolean ctrlKey, final boolean altKey,
             final boolean ignoreVisibility) throws IOException {
         wasPositionSpecified_ = true;
         return super.click(event, shiftKey, ctrlKey, altKey, ignoreVisibility);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setValue(final String newValue) {
         unmarkValueDirty();
         setDefaultValue(newValue);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setDefaultChecked(final boolean defaultChecked) {
         // Empty.
     }
 
     /**
      * {@inheritDoc} Also sets the value to the new default value.
      * @see SubmittableElement#setDefaultValue(String)
      */
     @Override
     public void setDefaultValue(final String defaultValue) {
         super.setDefaultValue(defaultValue);
         setRawValue(defaultValue);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     protected boolean isRequiredSupported() {
         return false;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setSrcAttribute(final String src) {
         super.setSrcAttribute(src);
         downloaded_ = false;
         imageWebResponse_ = null;
     }
 
     /**
      * <p>Downloads the image contained by this image element.</p>
      * <p><span style="color:red">POTENTIAL PERFORMANCE KILLER - DOWNLOADS THE IMAGE - USE AT YOUR OWN RISK</span></p>
      * <p>If the image has not already been downloaded, this method triggers a download and caches the image.</p>
      *
      * @throws IOException if an error occurs while downloading the image
      */
     private void downloadImageIfNeeded() throws IOException {
         if (!downloaded_) {
             final String src = getSrc();
             if (!org.htmlunit.util.StringUtils.isEmptyString(src)) {
                 final HtmlPage page = (HtmlPage) getPage();
                 final WebClient webClient = page.getWebClient();
 
                 final BrowserVersion browser = webClient.getBrowserVersion();
                 final WebRequest request = new WebRequest(new URL(src), browser.getImgAcceptHeader(),
                                                                 browser.getAcceptEncodingHeader());
                 request.setCharset(page.getCharset());
                 request.setRefererHeader(page.getUrl());
                 imageWebResponse_ = webClient.loadWebResponse(request);
             }
 
             downloaded_ = true;
         }
     }
 
     /**
      * Saves this image as the specified file.
      * @param file the file to save to
      * @throws IOException if an IO error occurs
      */
     public void saveAs(final File file) throws IOException {
         downloadImageIfNeeded();
         if (null != imageWebResponse_) {
             try (OutputStream fos = Files.newOutputStream(file.toPath());
                     InputStream inputStream = imageWebResponse_.getContentAsStream()) {
                 IOUtils.copy(inputStream, fos);
             }
         }
     }
 }