/*
 * Copyright (c) 2020, the SerenityOS developers.
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibWeb/Bindings/HTMLLIElement.h>
#include <LibWeb/CSS/PropertyID.h>
#include <LibWeb/CSS/StyleValues/CounterStyleStyleValue.h>
#include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
#include <LibWeb/HTML/HTMLLIElement.h>
#include <LibWeb/HTML/Numbers.h>
#include <LibWeb/HTML/Window.h>

namespace Web::HTML {

GC_DEFINE_ALLOCATOR(HTMLLIElement);

HTMLLIElement::HTMLLIElement(DOM::Document& document, DOM::QualifiedName qualified_name)
    : HTMLElement(document, move(qualified_name))
{
}

HTMLLIElement::~HTMLLIElement() = default;

void HTMLLIElement::initialize(JS::Realm& realm)
{
    WEB_SET_PROTOTYPE_FOR_INTERFACE(HTMLLIElement);
    Base::initialize(realm);
}

void HTMLLIElement::attribute_changed(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_)
{
    Base::attribute_changed(local_name, old_value, value, namespace_);

    if (local_name == HTML::AttributeNames::value) {
        if (auto owner = list_owner()) {
            owner->set_needs_layout_tree_update(true, DOM::SetNeedsLayoutTreeUpdateReason::HTMLOListElementOrdinalValues);
            maybe_invalidate_ordinals_for_list_owner();
        }
    }
}

// https://html.spec.whatwg.org/multipage/grouping-content.html#dom-li-value
WebIDL::Long HTMLLIElement::value()
{
    // The value IDL attribute must reflect the value of the value content attribute.
    // NOTE: This is equivalent to the code that would be generated by the IDL generator if we used [Reflect] on the value attribute.
    //       We don't do that in this case, since this method is used elsewhere.
    auto content_attribute_value = get_attribute(AttributeNames::value).value_or("0"_string);
    if (auto maybe_number = HTML::parse_integer(content_attribute_value); maybe_number.has_value())
        return *maybe_number;
    return 0;
}

void HTMLLIElement::set_value(WebIDL::Long value)
{
    set_attribute_value(AttributeNames::value, String::number(value));
}

bool HTMLLIElement::is_presentational_hint(FlyString const& name) const
{
    if (Base::is_presentational_hint(name))
        return true;

    return name == HTML::AttributeNames::type;
}

void HTMLLIElement::apply_presentational_hints(Vector<CSS::StyleProperty>& properties) const
{
    Base::apply_presentational_hints(properties);

    // https://html.spec.whatwg.org/multipage/rendering.html#lists
    for_each_attribute([&](auto& name, auto& value) {
        if (name == HTML::AttributeNames::type) {
            if (value == "1"sv) {
                properties.append({ .property_id = CSS::PropertyID::ListStyleType, .value = CSS::CounterStyleStyleValue::create("decimal"_fly_string) });
            } else if (value == "a"sv) {
                properties.append({ .property_id = CSS::PropertyID::ListStyleType, .value = CSS::CounterStyleStyleValue::create("lower-alpha"_fly_string) });
            } else if (value == "A"sv) {
                properties.append({ .property_id = CSS::PropertyID::ListStyleType, .value = CSS::CounterStyleStyleValue::create("upper-alpha"_fly_string) });
            } else if (value == "i"sv) {
                properties.append({ .property_id = CSS::PropertyID::ListStyleType, .value = CSS::CounterStyleStyleValue::create("lower-roman"_fly_string) });
            } else if (value == "I"sv) {
                properties.append({ .property_id = CSS::PropertyID::ListStyleType, .value = CSS::CounterStyleStyleValue::create("upper-roman"_fly_string) });
            } else if (value.equals_ignoring_ascii_case("none"sv)) {
                properties.append({ .property_id = CSS::PropertyID::ListStyleType, .value = CSS::KeywordStyleValue::create(CSS::Keyword::None) });
            } else if (value.equals_ignoring_ascii_case("disc"sv)) {
                properties.append({ .property_id = CSS::PropertyID::ListStyleType, .value = CSS::CounterStyleStyleValue::create("disc"_fly_string) });
            } else if (value.equals_ignoring_ascii_case("circle"sv)) {
                properties.append({ .property_id = CSS::PropertyID::ListStyleType, .value = CSS::CounterStyleStyleValue::create("circle"_fly_string) });
            } else if (value.equals_ignoring_ascii_case("square"sv)) {
                properties.append({ .property_id = CSS::PropertyID::ListStyleType, .value = CSS::CounterStyleStyleValue::create("square"_fly_string) });
            }
        }
    });
}

}