/*
 * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/WeakPtr.h>
#include <LibWeb/Forward.h>

namespace Web::HTML {

// Form-associated elements should invoke this macro to inject overridden FormAssociatedElement and HTMLElement
// methods as needed. If your class wished to override an HTMLElement method that is overridden here, use the
// following methods instead:
//
//    HTMLElement::inserted() -> Use form_associated_element_was_inserted()
//    HTMLElement::removed_from() -> Use form_associated_element_was_removed()
//
#define FORM_ASSOCIATED_ELEMENT(ElementBaseClass, ElementClass)             \
private:                                                                    \
    virtual HTMLElement& form_associated_element_to_html_element() override \
    {                                                                       \
        static_assert(IsBaseOf<HTMLElement, ElementClass>);                 \
        return *this;                                                       \
    }                                                                       \
                                                                            \
    virtual void inserted() override                                        \
    {                                                                       \
        ElementBaseClass::inserted();                                       \
        form_node_was_inserted();                                           \
        form_associated_element_was_inserted();                             \
    }                                                                       \
                                                                            \
    virtual void removed_from(DOM::Node* node) override                     \
    {                                                                       \
        ElementBaseClass::removed_from(node);                               \
        form_node_was_removed();                                            \
        form_associated_element_was_removed(node);                          \
    }

class FormAssociatedElement {
public:
    HTMLFormElement* form() { return m_form; }
    HTMLFormElement const* form() const { return m_form; }

    void set_form(HTMLFormElement*);

    bool enabled() const;

    void set_parser_inserted(Badge<HTMLParser>);

    // https://html.spec.whatwg.org/multipage/forms.html#category-listed
    virtual bool is_listed() const { return false; }

    // https://html.spec.whatwg.org/multipage/forms.html#category-submit
    virtual bool is_submittable() const { return false; }

    // https://html.spec.whatwg.org/multipage/forms.html#category-reset
    virtual bool is_resettable() const { return false; }

    // https://html.spec.whatwg.org/multipage/forms.html#category-autocapitalize
    virtual bool is_auto_capitalize_inheriting() const { return false; }

    virtual HTMLElement& form_associated_element_to_html_element() = 0;

    // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#concept-form-reset-control
    virtual void reset_algorithm() {};

protected:
    FormAssociatedElement() = default;
    virtual ~FormAssociatedElement() = default;

    virtual void form_associated_element_was_inserted() { }
    virtual void form_associated_element_was_removed(DOM::Node*) { }

    void form_node_was_inserted();
    void form_node_was_removed();

private:
    WeakPtr<HTMLFormElement> m_form;

    // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#parser-inserted-flag
    bool m_parser_inserted { false };

    void reset_form_owner();
};

}