// TODO @芋艿：1）代码优化；2）是不是抽到公共的？
/**
 * 构造树型结构数据
 * @param {*} data 数据源
 * @param {*} id id字段 默认 'id'
 * @param {*} parentId 父节点字段 默认 'parentId'
 * @param {*} children 孩子节点字段 默认 'children'
 */
export const handleTree = (data: any[], id?: string, parentId?: string, children?: string) => {
  if (!Array.isArray(data)) {
    console.warn('data must be an array')
    return []
  }
  const config = {
    id: id || 'id',
    parentId: parentId || 'parentId',
    childrenList: children || 'children'
  }

  const childrenListMap = {}
  const nodeIds = {}
  const tree: any[] = []

  for (const d of data) {
    const parentId = d[config.parentId]
    if (childrenListMap[parentId] == null) {
      childrenListMap[parentId] = []
    }
    nodeIds[d[config.id]] = d
    childrenListMap[parentId].push(d)
  }

  for (const d of data) {
    const parentId = d[config.parentId]
    if (nodeIds[parentId] == null) {
      tree.push(d)
    }
  }

  for (const t of tree) {
    adaptToChildrenList(t)
  }

  function adaptToChildrenList(o) {
    if (childrenListMap[o[config.id]] !== null) {
      o[config.childrenList] = childrenListMap[o[config.id]]
    }
    if (o[config.childrenList]) {
      for (const c of o[config.childrenList]) {
        adaptToChildrenList(c)
      }
    }
  }

  return tree
}