/*

 * Copyright (c) 2021, the SerenityOS developers.

 * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#pragma once

#include <AK/String.h>

#include <LibJS/Heap/GCPtr.h>

#include <LibWeb/Bindings/PlatformObject.h>

#include <LibWeb/CSS/CSSStyleDeclaration.h>

#include <LibWeb/CSS/Selector.h>

namespace Web::CSS {

class CSSRule : public Bindings::PlatformObject {

    WEB_PLATFORM_OBJECT(CSSRule, Bindings::PlatformObject);

public:

    virtual ~CSSRule() = default;

    // https://drafts.csswg.org/cssom/#dom-cssrule-type

    enum class Type : u16 {

        Style = 1,

        Import = 3,

        Media = 4,

        FontFace = 5,

        Keyframes = 7,

        Keyframe = 8,

        Namespace = 10,

        Supports = 12,

        // AD-HOC: These are not included in the spec, but we need them internally. So, their numbers are arbitrary.

        LayerBlock = 100,

        LayerStatement = 101,

        NestedDeclarations = 102,

    };

    virtual Type type() const = 0;

    String css_text() const;

    void set_css_text(StringView);

    CSSRule* parent_rule() { return m_parent_rule.ptr(); }

    CSSRule const* parent_rule() const { return m_parent_rule.ptr(); }

    void set_parent_rule(CSSRule*);

    CSSStyleSheet* parent_style_sheet() { return m_parent_style_sheet.ptr(); }

    virtual void set_parent_style_sheet(CSSStyleSheet*);

    template<typename T>

    bool fast_is() const = delete;

    // https://drafts.csswg.org/cssom-1/#serialize-a-css-rule

    virtual String serialized() const = 0;

protected:

    explicit CSSRule(JS::Realm&);

    virtual void visit_edges(Cell::Visitor&) override;

    virtual void clear_caches();

    [[nodiscard]] FlyString const& parent_layer_internal_qualified_name() const

    {

        if (!m_cached_layer_name.has_value())

            return parent_layer_internal_qualified_name_slow_case();

        return m_cached_layer_name.value();

    }

    [[nodiscard]] FlyString const& parent_layer_internal_qualified_name_slow_case() const;

    JS::GCPtr<CSSRule> m_parent_rule;

    JS::GCPtr<CSSStyleSheet> m_parent_style_sheet;

    mutable Optional<FlyString> m_cached_layer_name;

};

}