/*
 * Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibWeb/DOM/Text.h>
#include <LibWeb/HTML/HTMLInputElement.h>
#include <LibWeb/HTML/Window.h>
#include <LibWeb/Layout/TextNode.h>

namespace Web::DOM {

Text::Text(Document& document, const String& data)
    : CharacterData(document, NodeType::TEXT_NODE, data)
{
}

// https://dom.spec.whatwg.org/#dom-text-text
NonnullRefPtr<Text> Text::create_with_global_object(Bindings::WindowObject& window, String const& data)
{
    return make_ref_counted<Text>(window.impl().associated_document(), data);
}

void Text::set_owner_input_element(Badge<HTML::HTMLInputElement>, HTML::HTMLInputElement& input_element)
{
    m_owner_input_element = input_element;
}

// https://dom.spec.whatwg.org/#dom-text-splittext
// https://dom.spec.whatwg.org/#concept-text-split
ExceptionOr<NonnullRefPtr<Text>> Text::split_text(size_t offset)
{
    // 1. Let length be node’s length.
    auto length = this->length();

    // 2. If offset is greater than length, then throw an "IndexSizeError" DOMException.
    if (offset > length)
        return DOM::IndexSizeError::create("Split offset is greater than length");

    // 3. Let count be length minus offset.
    auto count = length - offset;

    // 4. Let new data be the result of substringing data with node node, offset offset, and count count.
    auto new_data_or_error = substring_data(offset, count);
    if (new_data_or_error.is_exception())
        return new_data_or_error.exception();
    auto new_data = new_data_or_error.release_value();

    // 5. Let new node be a new Text node, with the same node document as node. Set new node’s data to new data.
    auto new_node = adopt_ref(*new Text(document(), new_data));

    // 6. Let parent be node’s parent.
    RefPtr<Node> parent = this->parent();

    // 7. If parent is not null, then:
    if (parent) {
        // 1. Insert new node into parent before node’s next sibling.
        parent->insert_before(new_node, next_sibling());

        // FIXME: 2. For each live range whose start node is node and start offset is greater than offset, set its start node to new node and decrease its start offset by offset.

        // FIXME: 3. For each live range whose end node is node and end offset is greater than offset, set its end node to new node and decrease its end offset by offset.

        // FIXME: 4. For each live range whose start node is parent and start offset is equal to the index of node plus 1, increase its start offset by 1.

        // FIXME: 5. For each live range whose end node is parent and end offset is equal to the index of node plus 1, increase its end offset by 1.
    }

    // 8. Replace data with node node, offset offset, count count, and data the empty string.
    if (auto result = replace_data(offset, count, ""); result.is_exception())
        return result.exception();

    // 9. Return new node.
    return new_node;
}

}