/*
 * Copyright (c) 2020-2022, the SerenityOS developers.
 * Copyright (c) 2022, MacDue <macdue@dueutil.tech>
 * Copyright (c) 2023, Bastiaan van der Plaat <bastiaan.v.d.plaat@gmail.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/ShadowRoot.h>
#include <LibWeb/HTML/HTMLProgressElement.h>
#include <LibWeb/HTML/Numbers.h>

namespace Web::HTML {

JS_DEFINE_ALLOCATOR(HTMLProgressElement);

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

HTMLProgressElement::~HTMLProgressElement() = default;

void HTMLProgressElement::initialize(JS::Realm& realm)
{
    Base::initialize(realm);
    set_prototype(&Bindings::ensure_web_prototype<Bindings::HTMLProgressElementPrototype>(realm, "HTMLProgressElement"_fly_string));
}

void HTMLProgressElement::visit_edges(Cell::Visitor& visitor)
{
    Base::visit_edges(visitor);
    visitor.visit(m_progress_value_element);
}

// https://html.spec.whatwg.org/multipage/form-elements.html#dom-progress-value
double HTMLProgressElement::value() const
{
    auto maybe_value_string = get_attribute(HTML::AttributeNames::value);
    if (!maybe_value_string.has_value())
        return 0;
    auto maybe_value = parse_floating_point_number(maybe_value_string.value());
    if (!maybe_value.has_value())
        return 0;
    return clamp(maybe_value.value(), 0, max());
}

WebIDL::ExceptionOr<void> HTMLProgressElement::set_value(double value)
{
    if (value < 0 || value > max())
        return {};

    TRY(set_attribute(HTML::AttributeNames::value, MUST(String::number(value))));
    update_progress_value_element();
    document().invalidate_layout();
    return {};
}

// https://html.spec.whatwg.org/multipage/form-elements.html#dom-progress-max
double HTMLProgressElement::max() const
{
    auto maybe_max_string = get_attribute(HTML::AttributeNames::max);
    if (!maybe_max_string.has_value())
        return 1;
    auto maybe_max = parse_floating_point_number(maybe_max_string.value());
    if (!maybe_max.has_value())
        return 1;
    return AK::max(maybe_max.value(), 0);
}

WebIDL::ExceptionOr<void> HTMLProgressElement::set_max(double value)
{
    if (value <= 0)
        return {};

    TRY(set_attribute(HTML::AttributeNames::max, MUST(String::number(value))));
    update_progress_value_element();
    document().invalidate_layout();
    return {};
}

double HTMLProgressElement::position() const
{
    if (!is_determinate())
        return -1;

    return value() / max();
}

void HTMLProgressElement::inserted()
{
    create_shadow_tree_if_needed();
}

void HTMLProgressElement::removed_from(DOM::Node*)
{
    set_shadow_root(nullptr);
}

void HTMLProgressElement::create_shadow_tree_if_needed()
{
    if (shadow_root_internal())
        return;

    auto shadow_root = heap().allocate<DOM::ShadowRoot>(realm(), document(), *this, Bindings::ShadowRootMode::Closed);
    set_shadow_root(shadow_root);

    auto progress_bar_element = heap().allocate<ProgressBarElement>(realm(), document());
    MUST(shadow_root->append_child(*progress_bar_element));

    m_progress_value_element = heap().allocate<ProgressValueElement>(realm(), document());
    MUST(progress_bar_element->append_child(*m_progress_value_element));
    update_progress_value_element();
}

void HTMLProgressElement::update_progress_value_element()
{
    MUST(m_progress_value_element->set_attribute(HTML::AttributeNames::style, MUST(String::formatted("width: {}%;", position() * 100))));
}

}