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

#include <LibWeb/Bindings/MainThreadVM.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/HTMLTemplateElement.h>

namespace Web::HTML {

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

HTMLTemplateElement::~HTMLTemplateElement() = default;

JS::ThrowCompletionOr<void> HTMLTemplateElement::initialize(JS::Realm& realm)
{
    MUST_OR_THROW_OOM(Base::initialize(realm));
    set_prototype(&Bindings::ensure_web_prototype<Bindings::HTMLTemplateElementPrototype>(realm, "HTMLTemplateElement"));

    m_content = MUST_OR_THROW_OOM(heap().allocate<DOM::DocumentFragment>(realm, m_document->appropriate_template_contents_owner_document()));
    m_content->set_host(this);

    return {};
}

void HTMLTemplateElement::visit_edges(Cell::Visitor& visitor)
{
    Base::visit_edges(visitor);
    visitor.visit(m_content.ptr());
}

// https://html.spec.whatwg.org/multipage/scripting.html#the-template-element:concept-node-adopt-ext
void HTMLTemplateElement::adopted_from(DOM::Document&)
{
    // 1. Let doc be node's node document's appropriate template contents owner document.
    auto doc = document().appropriate_template_contents_owner_document();

    // 2. Adopt node's template contents (a DocumentFragment object) into doc.
    doc->adopt_node(content());
}

// https://html.spec.whatwg.org/multipage/scripting.html#the-template-element:concept-node-clone-ext
void HTMLTemplateElement::cloned(Node& copy, bool clone_children)
{
    if (!clone_children)
        return;

    auto& template_clone = verify_cast<HTMLTemplateElement>(copy);

    content()->for_each_child([&](auto& child) {
        auto cloned_child = child.clone_node(&template_clone.content()->document(), true);

        // FIXME: Should this use TreeNode::append_child instead?
        MUST(template_clone.content()->append_child(cloned_child));
    });
}

}