const recursion = (treeData: any, config: any, level: any) => {
  const {
    dataKey = 'key',
    dataLabel = 'title',
    childrenKey = 'children',
    levelKey = 'level',
    onlyChildSelected = true,
  }: {
    dataKey: string,
    dataLabel: string,
    childrenKey: string,
    levelKey: string,
    onlyChildSelected: boolean,
  } = config;

  const newTreeData = [];

  for (let i = 0, len = treeData.length; i < len; i += 1) {
    const treeDataItem = treeData[i];
    treeDataItem.key = treeDataItem[dataKey];
    treeDataItem.title = treeDataItem[dataLabel];
    treeDataItem.label = treeDataItem[dataLabel];
    treeDataItem.value = treeDataItem[dataKey];
    treeDataItem.level = treeDataItem[levelKey];
    if (treeDataItem[childrenKey] && treeDataItem[childrenKey].length) {
      treeDataItem.key = onlyChildSelected ? `${level}-${treeDataItem[dataKey]}` : treeDataItem[dataKey];
      treeDataItem.value = onlyChildSelected ? `${level}-${treeDataItem[dataKey]}` : treeDataItem[dataKey];
      treeDataItem.selectable = !onlyChildSelected;
      // eslint-disable-next-line no-param-reassign
      level += 1;
      treeDataItem.children = recursion(treeDataItem[childrenKey], config, level);
    }
    newTreeData.push(treeDataItem);
  }
  return newTreeData;
};

const format = (treeData: any, config: any) => {
  const i = 1;
  recursion(treeData, config, i);
};

export default format;