/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2000 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2004-2019 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#pragma once

#include "FormState.h"
#include "FormSubmission.h"
#include "HTMLElement.h"
#include "RadioButtonGroups.h"
#include <memory>
#include <wtf/IsoMalloc.h>
#include <wtf/WeakHashSet.h>

namespace WebCore {

class DOMFormData;
class Event;
class FormAssociatedElement;
class HTMLFormControlElement;
class HTMLFormControlsCollection;
class HTMLImageElement;

class HTMLFormElement final : public HTMLElement {
    WTF_MAKE_ISO_ALLOCATED(HTMLFormElement);
public:
    static Ref<HTMLFormElement> create(Document&);
    static Ref<HTMLFormElement> create(const QualifiedName&, Document&);
    virtual ~HTMLFormElement();

    Ref<HTMLFormControlsCollection> elements();
    WEBCORE_EXPORT Ref<HTMLCollection> elementsForNativeBindings();
    Vector<Ref<Element>> namedElements(const AtomString&);

    WEBCORE_EXPORT unsigned length() const;
    HTMLElement* item(unsigned index);
    std::optional<std::variant<RefPtr<RadioNodeList>, RefPtr<Element>>> namedItem(const AtomString&);
    Vector<AtomString> supportedPropertyNames() const;

    String enctype() const { return m_attributes.encodingType(); }
    WEBCORE_EXPORT void setEnctype(const String&);

    bool shouldAutocomplete() const;

    WEBCORE_EXPORT void setAutocomplete(const AtomString&);
    WEBCORE_EXPORT const AtomString& autocomplete() const;

#if ENABLE(AUTOCORRECT)
    WEBCORE_EXPORT bool shouldAutocorrect() const final;
#endif

    // FIXME: Should rename these two functions to say "form control" or "form-associated element" instead of "form element".
    void registerFormElement(FormAssociatedElement*);
    void removeFormElement(FormAssociatedElement*);

    void registerInvalidAssociatedFormControl(const HTMLFormControlElement&);
    void removeInvalidAssociatedFormControlIfNeeded(const HTMLFormControlElement&);

    void registerImgElement(HTMLImageElement*);
    void removeImgElement(HTMLImageElement*);

    void submitIfPossible(Event*, HTMLFormControlElement* = nullptr, FormSubmissionTrigger = NotSubmittedByJavaScript);
    WEBCORE_EXPORT void submit();
    void submitFromJavaScript();
    ExceptionOr<void> requestSubmit(HTMLElement* submitter);
    WEBCORE_EXPORT void reset();

    void setDemoted(bool demoted) { m_wasDemoted = demoted; }

    void submitImplicitly(Event&, bool fromImplicitSubmissionTrigger);
    bool formWouldHaveSecureSubmission(const String& url);

    String name() const;

    bool noValidate() const;

    String acceptCharset() const { return m_attributes.acceptCharset(); }
    void setAcceptCharset(const String&);

    WEBCORE_EXPORT String action() const;
    WEBCORE_EXPORT void setAction(const String&);

    WEBCORE_EXPORT String method() const;
    WEBCORE_EXPORT void setMethod(const String&);

    String target() const final;
    String effectiveTarget(const Event*, HTMLFormControlElement* submitter) const;

    bool wasUserSubmitted() const;

    HTMLFormControlElement* findSubmitter(const Event*) const;

    HTMLFormControlElement* defaultButton() const;
    void resetDefaultButton();

    WEBCORE_EXPORT bool checkValidity();
    bool reportValidity();

    RadioButtonGroups& radioButtonGroups() { return m_radioButtonGroups; }

    WEBCORE_EXPORT const Vector<WeakPtr<HTMLElement>>& unsafeAssociatedElements() const;
    Vector<Ref<FormAssociatedElement>> copyAssociatedElementsVector() const;
    const Vector<WeakPtr<HTMLImageElement>>& imageElements() const { return m_imageElements; }

    StringPairVector textFieldValues() const;

    static HTMLFormElement* findClosestFormAncestor(const Element&);
    
    enum class IsMultipartForm : bool { No, Yes };
    
    RefPtr<DOMFormData> constructEntryList(Ref<DOMFormData>&&, StringPairVector*, IsMultipartForm);
    
private:
    HTMLFormElement(const QualifiedName&, Document&);

    bool rendererIsNeeded(const RenderStyle&) final;
    InsertedIntoAncestorResult insertedIntoAncestor(InsertionType, ContainerNode&) final;
    void removedFromAncestor(RemovalType, ContainerNode&) final;
    void finishParsingChildren() final;

    void parseAttribute(const QualifiedName&, const AtomString&) final;
    bool isURLAttribute(const Attribute&) const final;

    void resumeFromDocumentSuspension() final;

    void didMoveToNewDocument(Document& oldDocument, Document& newDocument) final;

    void copyNonAttributePropertiesFromElement(const Element&) final;

    void submit(Event*, bool activateSubmitButton, bool processingUserGesture, FormSubmissionTrigger, HTMLFormControlElement* submitter = nullptr);

    void submitDialog(Ref<FormSubmission>&&);

    unsigned formElementIndexWithFormAttribute(Element*, unsigned rangeStart, unsigned rangeEnd);
    unsigned formElementIndex(FormAssociatedElement*);

    bool validateInteractively();

    // Validates each of the controls, and stores controls of which 'invalid'
    // event was not canceled to the specified vector. Returns true if there
    // are any invalid controls in this form.
    bool checkInvalidControlsAndCollectUnhandled(Vector<RefPtr<HTMLFormControlElement>>&);

    RefPtr<HTMLElement> elementFromPastNamesMap(const AtomString&) const;
    void addToPastNamesMap(FormNamedItem*, const AtomString& pastName);
#if ASSERT_ENABLED
    void assertItemCanBeInPastNamesMap(FormNamedItem*) const;
#endif
    void removeFromPastNamesMap(FormNamedItem*);

    bool matchesValidPseudoClass() const final;
    bool matchesInvalidPseudoClass() const final;

    void resetAssociatedFormControlElements();

    RefPtr<HTMLFormControlElement> findSubmitButton(HTMLFormControlElement* submitter, bool needButtonActivation);

    FormSubmission::Attributes m_attributes;
    HashMap<AtomString, WeakPtr<HTMLElement>> m_pastNamesMap;

    RadioButtonGroups m_radioButtonGroups;
    mutable WeakPtr<HTMLFormControlElement> m_defaultButton;

    unsigned m_associatedElementsBeforeIndex { 0 };
    unsigned m_associatedElementsAfterIndex { 0 };
    Vector<WeakPtr<HTMLElement>> m_associatedElements;
    Vector<WeakPtr<HTMLImageElement>> m_imageElements;
    WeakHashSet<HTMLFormControlElement> m_invalidAssociatedFormControls;
    WeakPtr<FormSubmission> m_plannedFormSubmission;

    bool m_wasUserSubmitted { false };
    bool m_isSubmittingOrPreparingForSubmission { false };
    bool m_shouldSubmit { false };

    bool m_isInResetFunction { false };

    bool m_wasDemoted { false };
    bool m_isConstructingEntryList { false };
};

} // namespace WebCore