airbnb/caravel

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
interface ILayoutItem {
  [key: string]: {
    id: string;
    children: string[];
  };
}

interface IStructure {
  childId: string;
  layout: ILayoutItem;
}

function findParentId(structure: IStructure): string | null {
  let parentId = null;
  if (structure) {
    const { childId, layout = {} } = structure;
    // default assignment to layout only works if value is undefined, not null
    if (layout) {
      const ids = Object.keys(layout);
      for (let i = 0; i <= ids.length - 1; i += 1) {
        const id = ids[i];
        const component = layout[id] || {};
        if (id !== childId && component?.children?.includes?.(childId)) {
          parentId = id;
          break;
        }
      }
    }
  }
  return parentId;
}

const cache = {};
export default function findParentIdWithCache(
  structure: IStructure,
): string | null {
  let parentId = null;
  if (structure) {
    const { childId, layout = {} } = structure;
    if (cache[childId]) {
      const lastParent = layout?.[cache[childId]] || {};
      if (lastParent?.children && lastParent?.children?.includes?.(childId)) {
        return lastParent.id;
      }
    }
    parentId = findParentId({ childId, layout });
    cache[childId] = parentId;
  }
  return parentId;
}