/*
    * 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_FORM_DISPATCHEVENT_SUBMITS;
  
  import java.io.Serializable;
  import java.net.MalformedURLException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.function.Supplier;
  
  import org.htmlunit.FormEncodingType;
  import org.htmlunit.WebAssert;
  import org.htmlunit.corejs.javascript.Context;
  import org.htmlunit.corejs.javascript.Function;
  import org.htmlunit.corejs.javascript.Scriptable;
  import org.htmlunit.corejs.javascript.ScriptableObject;
  import org.htmlunit.corejs.javascript.VarScope;
  import org.htmlunit.html.DomElement;
  import org.htmlunit.html.DomNode;
  import org.htmlunit.html.HtmlAttributeChangeEvent;
  import org.htmlunit.html.HtmlElement;
  import org.htmlunit.html.HtmlForm;
  import org.htmlunit.html.HtmlImage;
  import org.htmlunit.html.HtmlPage;
  import org.htmlunit.html.SubmittableElement;
  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.configuration.JsxSymbol;
  import org.htmlunit.javascript.host.dom.AbstractList.EffectOnCache;
  import org.htmlunit.javascript.host.dom.DOMTokenList;
  import org.htmlunit.javascript.host.dom.RadioNodeList;
  import org.htmlunit.javascript.host.event.Event;
  import org.htmlunit.util.MimeType;
  
  /**
   * A JavaScript object {@code HTMLFormElement}.
   *
   * @author Mike Bowler
   * @author Daniel Gredler
   * @author Kent Tong
   * @author Chris Erskine
   * @author Marc Guillemot
   * @author Ahmed Ashour
   * @author Sudhan Moghe
   * @author Ronald Brill
   * @author Frank Danek
   * @author Lai Quang Duong
   *
   * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement">MDN Documentation</a>
   */
  @JsxClass(domClass = HtmlForm.class)
  public class HTMLFormElement extends HTMLElement implements Function {
  
      /**
       * JavaScript constructor.
       */
      @Override
      @JsxConstructor
      public void jsConstructor() {
          super.jsConstructor();
      }
  
      /**
       * Returns the value of the property {@code name}.
       * @return the value of this property
       */
      @JsxGetter
      @Override
      public String getName() {
          return getHtmlForm().getNameAttribute();
      }
  
      /**
       * Sets the value of the property {@code name}.
       * @param name the new value
       */
      @JsxSetter
      @Override
      public void setName(final String name) {
          getHtmlForm().setNameAttribute(name);
      }
 
     /**
      * Returns the value of the property {@code elements}.
      * @return the value of this property
      */
     @JsxGetter
     public HTMLFormControlsCollection getElements() {
         final HtmlForm htmlForm = getHtmlForm();
 
         final HTMLFormControlsCollection elements = new HTMLFormControlsCollection(htmlForm, false) {
             @Override
             protected Object getWithPreemption(final String name) {
                 final List<HtmlElement> elementsForName = findElements(name);
                 if (elementsForName.isEmpty()) {
                     return NOT_FOUND;
                 }
                 if (elementsForName.size() == 1) {
                     return getScriptableFor(elementsForName.get(0));
                 }
 
                 final List<DomNode> nodes = new ArrayList<>(elementsForName);
                 final RadioNodeList nodeList = new RadioNodeList(getHtmlForm(), nodes);
                 nodeList.setElementsSupplier(
                         (Supplier<List<DomNode>> & Serializable) () -> new ArrayList<>(findElements(name)));
                 return nodeList;
             }
         };
 
         elements.setElementsSupplier(
                 (Supplier<List<DomNode>> & Serializable)
                 () -> {
                     final DomNode domNode = getDomNodeOrNull();
                     if (domNode == null) {
                         return new ArrayList<>();
                     }
                     return new ArrayList<>(((HtmlForm) domNode).getElementsJS());
                 });
 
         elements.setEffectOnCacheFunction(
                 (java.util.function.Function<HtmlAttributeChangeEvent, EffectOnCache> & Serializable)
                 event -> EffectOnCache.NONE);
 
         return elements;
     }
 
     /**
      * Returns the {@code Symbol.iterator} function that allows iterating over the form's elements.
      * @return the Iterator symbol
      */
     @JsxSymbol
     public Scriptable iterator() {
         return getElements().iterator();
     }
 
     /**
      * Returns the value of the property {@code length}.
      * Does not count input {@code type=image} elements
      * (<a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/length">MDN doc</a>)
      * @return the value of this property
      */
     @JsxGetter
     public int getLength() {
         return getElements().getLength();
     }
 
     /**
      * Returns the value of the property {@code action}.
      * @return the value of this property
      */
     @JsxGetter
     public String getAction() {
         final String action = getHtmlForm().getActionAttribute();
 
         try {
             return ((HtmlPage) getHtmlForm().getPage()).getFullyQualifiedUrl(action).toExternalForm();
         }
         catch (final MalformedURLException ignored) {
             // nothing, return action attribute
         }
         return action;
     }
 
     /**
      * Sets the value of the property {@code action}.
      * @param action the new value
      */
     @JsxSetter
     public void setAction(final String action) {
         WebAssert.notNull("action", action);
         getHtmlForm().setActionAttribute(action);
     }
 
     /**
      * Returns the value of the property {@code method}.
      * @return the value of this property
      */
     @JsxGetter
     public String getMethod() {
         return getHtmlForm().getMethodAttribute();
     }
 
     /**
      * Sets the value of the property {@code method}.
      * @param method the new value
      */
     @JsxSetter
     public void setMethod(final String method) {
         WebAssert.notNull("method", method);
         getHtmlForm().setMethodAttribute(method);
     }
 
     /**
      * Returns the value of the property {@code target}.
      * @return the value of this property
      */
     @JsxGetter
     public String getTarget() {
         return getHtmlForm().getTargetAttribute();
     }
 
     /**
      * Sets the value of the property {@code target}.
      * @param target the new value
      */
     @JsxSetter
     public void setTarget(final String target) {
         WebAssert.notNull("target", target);
         getHtmlForm().setTargetAttribute(target);
     }
 
     /**
      * Returns the value of the property {@code rel}.
      * @return the value of this property
      */
     @JsxGetter
     public String getRel() {
         return getHtmlForm().getRelAttribute();
     }
 
     /**
      * Sets the value of the property {@code rel}.
      * @param rel the new value
      */
     @JsxSetter
     public void setRel(final String rel) {
         getHtmlForm().setAttribute("rel", rel);
     }
 
     /**
      * Returns the {@code relList} attribute.
      * @return the {@code relList} attribute
      */
     @JsxGetter
     public DOMTokenList getRelList() {
         return new DOMTokenList(this, "rel");
     }
 
     /**
      * Sets the {@code relList} attribute.
      * @param rel the {@code relList} attribute value
      */
     @JsxSetter
     public void setRelList(final Object rel) {
         if (JavaScriptEngine.isUndefined(rel)) {
             setRel("undefined");
             return;
         }
         setRel(JavaScriptEngine.toString(rel));
     }
 
     /**
      * Returns the value of the property {@code enctype}.
      * @return the value of this property
      */
     @JsxGetter
     public String getEnctype() {
         final String encoding = getHtmlForm().getEnctypeAttribute();
         if (!FormEncodingType.URL_ENCODED.getName().equals(encoding)
                 && !FormEncodingType.MULTIPART.getName().equals(encoding)
                 && !MimeType.TEXT_PLAIN.equals(encoding)) {
             return FormEncodingType.URL_ENCODED.getName();
         }
         return encoding;
     }
 
     /**
      * Sets the value of the property {@code enctype}.
      * @param enctype the new value
      */
     @JsxSetter
     public void setEnctype(final String enctype) {
         WebAssert.notNull("encoding", enctype);
         getHtmlForm().setEnctypeAttribute(enctype);
     }
 
     /**
      * Returns the value of the property {@code encoding}.
      * @return the value of this property
      */
     @JsxGetter
     public String getEncoding() {
         return getEnctype();
     }
 
     /**
      * Sets the value of the property {@code encoding}.
      * @param encoding the new value
      */
     @JsxSetter
     public void setEncoding(final String encoding) {
         setEnctype(encoding);
     }
 
     /**
      * Returns the {@link HtmlForm} associated with this element.
      * @return the associated HtmlForm
      */
     public HtmlForm getHtmlForm() {
         return (HtmlForm) getDomNodeOrDie();
     }
 
     /**
      * Submits the form (at the end of the current script execution).
      */
     @JsxFunction
     public void submit() {
         getHtmlForm().submit(null);
     }
 
     /**
      * Submits the form using the specified submit button.
      * @param submitter the submit button whose attributes describe the method
      *        by which the form is to be submitted. This may be either
      *        a &lt;input&gt; or &lt;button&gt; element whose type attribute is submit.
      *        If you omit the submitter parameter, the form element itself is used as the submitter.
      */
     @JsxFunction
     public void requestSubmit(final Object submitter) {
         if (JavaScriptEngine.isUndefined(submitter)) {
             submit();
             return;
         }
 
         SubmittableElement submittable = null;
         if (submitter instanceof HTMLElement subHtmlElement) {
             if (subHtmlElement instanceof HTMLButtonElement element1) {
                 if ("submit".equals(element1.getType())) {
                     submittable = (SubmittableElement) subHtmlElement.getDomNodeOrDie();
                 }
             }
             else if (subHtmlElement instanceof HTMLInputElement element) {
                 if ("submit".equals(element.getType())) {
                     submittable = (SubmittableElement) subHtmlElement.getDomNodeOrDie();
                 }
             }
 
             if (submittable != null && subHtmlElement.getForm() != this) {
                 throw JavaScriptEngine.typeError(
                         "Failed to execute 'requestSubmit' on 'HTMLFormElement': "
                         + "The specified element is not owned by this form element.");
             }
         }
 
         if (submittable == null) {
             throw JavaScriptEngine.typeError(
                     "Failed to execute 'requestSubmit' on 'HTMLFormElement': "
                     + "The specified element is not a submit button.");
         }
 
         this.getHtmlForm().submit(submittable);
     }
 
     /**
      * Resets this form.
      */
     @JsxFunction
     public void reset() {
         getHtmlForm().reset();
     }
 
     /**
      * Overridden to allow the retrieval of certain form elements by ID or name.
      * @see <a href="https://html.spec.whatwg.org/multipage/forms.html#dom-form-nameditem">
      *     HTML spec - form named item</a>
      *
      * @param name {@inheritDoc}
      * @return {@inheritDoc}
      */
     @Override
     protected Object getWithPreemption(final String name) {
         if (getDomNodeOrNull() == null) {
             return NOT_FOUND;
         }
         final List<HtmlElement> elements = findElements(name);
 
         if (elements.isEmpty()) {
             final HtmlElement element = getHtmlForm().getNamedElement(name);
             return element != null ? getScriptableFor(element) : NOT_FOUND;
         }
         if (elements.size() == 1) {
             final HtmlElement element = elements.get(0);
             getHtmlForm().registerPastName(name, element);
             return getScriptableFor(element);
         }
         final List<DomNode> nodes = new ArrayList<>(elements);
 
         final RadioNodeList nodeList = new RadioNodeList(getHtmlForm(), nodes);
         nodeList.setElementsSupplier(
                 (Supplier<List<DomNode>> & Serializable)
                 () -> new ArrayList<>(findElements(name)));
         return nodeList;
     }
 
     /**
      * Overridden to allow the retrieval of certain form elements by ID or name.
      *
      * @param name {@inheritDoc}
      * @param start {@inheritDoc}
      * @return {@inheritDoc}
      */
     @Override
     public boolean has(final String name, final Scriptable start) {
         if (super.has(name, start)) {
             return true;
         }
 
         return findFirstElement(name) != null;
     }
 
     /**
      * Overridden to allow the retrieval of certain form elements by ID or name.
      *
      * @param cx {@inheritDoc}
      * @param id {@inheritDoc}
      * @return {@inheritDoc}
      */
     @Override
     protected DescriptorInfo getOwnPropertyDescriptor(final Context cx, final Object id) {
         final DescriptorInfo descInfo = super.getOwnPropertyDescriptor(cx, id);
         if (descInfo != null) {
             return descInfo;
         }
 
         if (id instanceof CharSequence) {
             final HtmlElement element = findFirstElement(id.toString());
             if (element != null) {
                 return ScriptableObject.buildDataDescriptor(element.getScriptableObject(),
                                             ScriptableObject.READONLY | ScriptableObject.DONTENUM);
             }
         }
 
         return null;
     }
 
     List<HtmlElement> findElements(final String name) {
         final List<HtmlElement> elements = new ArrayList<>();
         final HtmlForm form = (HtmlForm) getDomNodeOrNull();
         if (form == null) {
             return elements;
         }
 
         for (final HtmlElement element : form.getElementsJS()) {
             if (name.equals(element.getId())
                     || name.equals(element.getAttributeDirect(DomElement.NAME_ATTRIBUTE))) {
                 elements.add(element);
             }
         }
 
         // If no form fields are found, browsers are able to find img elements by ID or name.
         if (elements.isEmpty()) {
             for (final DomNode node : form.getHtmlElementDescendants()) {
                 if (node instanceof HtmlImage img) {
                     if (name.equals(img.getId()) || name.equals(img.getNameAttribute())) {
                         elements.add(img);
                     }
                 }
             }
         }
 
         return elements;
     }
 
     private HtmlElement findFirstElement(final String name) {
         final HtmlForm form = (HtmlForm) getDomNodeOrNull();
         if (form == null) {
             return null;
         }
 
         for (final HtmlElement node : form.getElementsJS()) {
             if (name.equals(node.getId())
                     || name.equals(node.getAttributeDirect(DomElement.NAME_ATTRIBUTE))) {
                 return node;
             }
         }
 
         // If no form fields are found, browsers are able to find img elements by ID or name.
         for (final DomNode node : form.getHtmlElementDescendants()) {
             if (node instanceof HtmlImage img) {
                 if (name.equals(img.getId()) || name.equals(img.getNameAttribute())) {
                     return img;
                 }
             }
         }
 
         return null;
     }
 
     /**
      * Returns the specified indexed property.
      * @param index the index of the property
      * @param start the scriptable object that was originally queried for this property
      * @return the property
      */
     @Override
     public Object get(final int index, final Scriptable start) {
         if (getDomNodeOrNull() == null) {
             return NOT_FOUND; // typically for the prototype
         }
         return getElements().get(index, ((HTMLFormElement) start).getElements());
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Object call(final Context cx, final VarScope scope, final Scriptable thisObj, final Object[] args) {
         throw JavaScriptEngine.typeError("Not a function.");
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Scriptable construct(final Context cx, final VarScope scope, final Object[] args) {
         throw JavaScriptEngine.typeError("Not a function.");
     }
 
     @Override
     public boolean dispatchEvent(final Event event) {
         final boolean result = super.dispatchEvent(event);
 
         if (Event.TYPE_SUBMIT.equals(event.getType())
                 && getBrowserVersion().hasFeature(JS_FORM_DISPATCHEVENT_SUBMITS)) {
             submit();
         }
         return result;
     }
 
     /**
      * Checks whether the element has any constraints and whether it satisfies them.
      * @return {@code true} if the element is valid
      */
     @JsxFunction
     public boolean checkValidity() {
         return getDomNodeOrDie().isValid();
     }
 
     /**
      * Returns the value of the property {@code novalidate}.
      * @return the value of this property
      */
     @JsxGetter
     public boolean isNoValidate() {
         return getHtmlForm().isNoValidate();
     }
 
     /**
      * Sets the value of the property {@code novalidate}.
      * @param value the new value
      */
     @JsxSetter
     public void setNoValidate(final boolean value) {
         getHtmlForm().setNoValidate(value);
     }
 }