import type { InsertNodeParams, ReplaceFields, TreeItem } from './types';
import type { Ref, ComputedRef } from 'vue';

import { cloneDeep } from 'lodash-es';
import { unref } from 'vue';
import { forEach } from '/@/utils/helper/treeHelper';

export function useTree(
  treeDataRef: Ref<TreeItem[]>,
  getReplaceFields: ComputedRef<ReplaceFields>
) {
  // 更新节点
  function updateNodeByKey(key: string, node: TreeItem, list: TreeItem[]) {
    if (!key) return;
    const treeData = list || unref(treeDataRef);
    const { key: keyField, children: childrenField } = unref(getReplaceFields);

    if (!childrenField || !keyField) return;

    for (let index = 0; index < treeData.length; index++) {
      const element: any = treeData[index];
      const children = element[childrenField];

      if (element[keyField] === key) {
        treeData[index] = { ...treeData[index], ...node };
        break;
      } else if (children && children.length) {
        updateNodeByKey(key, node, element[childrenField]);
      }
    }
  }

  // 展开指定级别
  function filterByLevel(level = 1, list?: TreeItem[], currentLevel = 1) {
    if (!level) {
      return [];
    }
    const res: (string | number)[] = [];
    const data = list || unref(treeDataRef) || [];
    for (let index = 0; index < data.length; index++) {
      const item = data[index] as any;

      const { key: keyField, children: childrenField } = unref(getReplaceFields);
      const key = keyField ? item[keyField] : '';
      const children = childrenField ? item[childrenField] : [];
      res.push(key);
      if (children && children.length && currentLevel < level) {
        currentLevel += 1;
        res.push(...filterByLevel(level, children, currentLevel));
      }
    }
    return res as string[] | number[];
  }

  /**
   * 添加节点
   */
  function insertNodeByKey({ parentKey = null, node, push = 'push' }: InsertNodeParams) {
    const treeData: any = cloneDeep(unref(treeDataRef));
    if (!parentKey) {
      treeData[push](node);
      treeDataRef.value = treeData;
      return;
    }
    const { key: keyField, children: childrenField } = unref(getReplaceFields);
    if (!childrenField || !keyField) return;

    forEach(treeData, (treeItem) => {
      if (treeItem[keyField] === parentKey) {
        treeItem[childrenField] = treeItem[childrenField] || [];
        treeItem[childrenField][push](node);
      }
    });
    treeDataRef.value = treeData;
  }

  // 删除节点
  function deleteNodeByKey(key: string, list: TreeItem[]) {
    if (!key) return;
    const treeData = list || unref(treeDataRef);
    const { key: keyField, children: childrenField } = unref(getReplaceFields);
    if (!childrenField || !keyField) return;

    for (let index = 0; index < treeData.length; index++) {
      const element: any = treeData[index];
      const children = element[childrenField];

      if (element[keyField] === key) {
        treeData.splice(index, 1);
        break;
      } else if (children && children.length) {
        deleteNodeByKey(key, element[childrenField]);
      }
    }
  }
  return { deleteNodeByKey, insertNodeByKey, filterByLevel, updateNodeByKey };
}
