// Copyright: Ankitects Pty Ltd and contributors
// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html

export function removeNode(element: Node): void {
    element.parentNode?.removeChild(element);
}

function iterateElement(
    filter: (node: Node) => void,
    fragment: DocumentFragment | Element,
): void {
    for (const child of [...fragment.childNodes]) {
        filter(child);
    }
}

export const filterNode =
    (elementFilter: (element: Element) => void) =>
    (node: Node): void => {
        switch (node.nodeType) {
            case Node.COMMENT_NODE:
                removeNode(node);
                break;

            case Node.DOCUMENT_FRAGMENT_NODE:
                iterateElement(filterNode(elementFilter), node as DocumentFragment);
                break;

            case Node.ELEMENT_NODE:
                iterateElement(filterNode(elementFilter), node as Element);
                elementFilter(node as Element);
                break;

            default:
            // do nothing
        }
    };