FezVrasta/popper.js

import type {FloatingNodeType, ReferenceType} from '../types';

export function getChildren<RT extends ReferenceType = ReferenceType>(
  nodes: Array<FloatingNodeType<RT>>,
  id: string | undefined,
) {
  let allChildren = nodes.filter(
    (node) => node.parentId === id && node.context?.open,
  );
  let currentChildren = allChildren;

  while (currentChildren.length) {
    currentChildren = nodes.filter(
      (node) =>
        currentChildren?.some(
          (n) => node.parentId === n.id && node.context?.open,
        ),
    );

    allChildren = allChildren.concat(currentChildren);
  }

  return allChildren;
}

export function getDeepestNode<RT extends ReferenceType = ReferenceType>(
  nodes: Array<FloatingNodeType<RT>>,
  id: string | undefined,
) {
  let deepestNodeId: string | undefined;
  let maxDepth = -1;

  function findDeepest(nodeId: string | undefined, depth: number) {
    if (depth > maxDepth) {
      deepestNodeId = nodeId;
      maxDepth = depth;
    }

    const children = getChildren(nodes, nodeId);

    children.forEach((child) => {
      findDeepest(child.id, depth + 1);
    });
  }

  findDeepest(id, 0);

  return nodes.find((node) => node.id === deepestNodeId);
}