import { PageContainer } from '@ant-design/pro-layout';
import { useDomFullHeight } from '@/hooks';
import {
  ExclamationCircleOutlined,
  QuestionCircleOutlined,
  RightOutlined,
} from '@ant-design/icons';
import Tree from './tree';
import './index.less';
import { Button, Tooltip } from 'antd';
import BaseTreeData from './baseMenu';
import { useEffect, useState } from 'react';
import { HTML5Backend } from 'react-dnd-html5-backend';
import { DndProvider } from 'react-dnd';
import { cloneDeep } from 'lodash';
import { observable } from '@formily/reactive';
import { Observer, observer } from '@formily/react';
import { service } from '../index';
import type { TreeProps, DataNode } from 'antd/es/tree';

type MenuSettingModelType = {
  menuData: any[];
  notDragKeys: (string | number)[];
};

export const MenuSettingModel = observable<MenuSettingModelType>({
  menuData: [],
  notDragKeys: [],
});

export default observer(() => {
  const { minHeight } = useDomFullHeight(`.menu-setting-warp`);
  const [baseMenu, setBaseMenu] = useState<any[]>(BaseTreeData);
  const [loading, setLoading] = useState(false);

  const finedObject = (
    data: any[],
    code: string | number,
    callback: (index: number, arr: any[], item: any) => void,
  ) => {
    data.forEach((item, index) => {
      if (item.code === code) {
        return callback(index, data, item);
      }

      if (item.children) {
        finedObject(item.children, code, callback);
      }
    });
  };

  const onTreeDrop: TreeProps['onDrop'] = (info) => {
    const dropKey = info.node.key;
    const dragKey = info.dragNode.key;
    const dropPos = info.node.pos.split('-');
    const dropPosition = info.dropPosition - Number(dropPos[dropPos.length - 1]);

    const data = [...MenuSettingModel.menuData];
    let dragObj: DataNode & { parentId: string };

    finedObject(data, dragKey, (index, arr, item) => {
      arr.splice(index, 1);
      dragObj = item;
      dragObj.parentId = '';
    });

    if (!info.dropToGap) {
      finedObject(data, dropKey, (_i, _arr, item) => {
        item.children = item.children || [];
        dragObj.parentId = item.id;

        item.children.unshift(dragObj);
      });
    } else if (
      ((info.node as any).props.children || []).length > 0 &&
      (info.node as any).props.expanded &&
      dropPosition === 1
    ) {
      finedObject(data, dropKey, (_i, _arr, item) => {
        item.children = item.children || [];
        dragObj.parentId = item.id;

        item.children.unshift(dragObj);
      });
    } else {
      let ar: DataNode[] = [];
      let i: number;
      finedObject(data, dropKey, (index, arr, item) => {
        ar = arr;
        i = index;
        dragObj.parentId = item.parentId;
      });
      if (dropPosition === -1) {
        ar.splice(i!, 0, dragObj!);
      } else {
        ar.splice(i! + 1, 0, dragObj!);
      }
    }
    MenuSettingModel.menuData = [...data];
  };

  const getKeys = (data: any[]): (string | number)[] => {
    return data.reduce((pre: (string | number)[], next: any) => {
      const childrenKeys = next.children ? getKeys(next.children) : [];
      return [...pre, next.code, ...childrenKeys];
    }, []);
  };

  const filterItem = (data: any[], dragKeys: (string | number)[]) => {
    return data.filter((item) => {
      if (dragKeys.includes(item.code)) {
        return false;
      } else if (item.children) {
        item.children = filterItem(item.children, dragKeys);
      }
      return true;
    });
  };

  const onDrop = (item: any, dropIndex: string, type?: string) => {
    const newItem = cloneDeep(item);

    if (dropIndex) {
      // 切换层级或者挪动
      // const newMenus = cloneDeep(menuData);
      if (type === 'source') {
        finedObject(MenuSettingModel.menuData, dropIndex, (index, arr) => {
          arr.splice(index + 1, 0, newItem);
        });
        MenuSettingModel.menuData = [...MenuSettingModel.menuData];
      }
    } else {
      // 新增
      newItem.parentId = '';
      // 过滤掉内部已选择的节点
      if (newItem.children && MenuSettingModel.notDragKeys.length) {
        newItem.children = filterItem(newItem.children, MenuSettingModel.notDragKeys);
      }
      MenuSettingModel.menuData.push(newItem);
      MenuSettingModel.notDragKeys = getKeys(MenuSettingModel.menuData);
    }
  };

  const removeDragItem = (id: string | number) => {
    finedObject(MenuSettingModel.menuData, id, (index, arr) => {
      arr.splice(index, 1);
    });
    MenuSettingModel.menuData = [...MenuSettingModel.menuData];
    MenuSettingModel.notDragKeys = getKeys(MenuSettingModel.menuData);
  };

  const getSystemMenu = () => {
    service.queryMenuThree({ paging: false }).then((res) => {
      if (res.status === 200) {
        MenuSettingModel.menuData = [...res.result];
        MenuSettingModel.notDragKeys = getKeys(res.result);
      }
    });
  };

  useEffect(() => {
    getSystemMenu();
    setBaseMenu(BaseTreeData);
  }, []);

  const updateMenu = () => {
    setLoading(true);
    service.updateMenus(MenuSettingModel.menuData).then((res) => {
      setLoading(false);
      if (res.status === 200) {
      }
    });
  };

  return (
    <PageContainer>
      <div className={'menu-setting-warp'} style={{ minHeight }}>
        <div className={'menu-setting-tip'}>
          <ExclamationCircleOutlined />
          <span style={{ paddingLeft: 12 }}>基于系统源代码中的菜单数据，配置系统菜单。</span>
        </div>
        <div className={'menu-tree-content'}>
          <DndProvider backend={HTML5Backend}>
            <div className={'menu-tree left-tree'}>
              <div className={'menu-tree-title'} style={{ padding: '10px 16px' }}>
                <div>
                  <span style={{ paddingRight: 12 }}>源菜单</span>
                  <Tooltip title={'根据系统代码自动读取的菜单数据'}>
                    <QuestionCircleOutlined />
                  </Tooltip>
                </div>
                <Button
                  type={'primary'}
                  ghost
                  onClick={() => {
                    MenuSettingModel.menuData = cloneDeep(baseMenu);
                  }}
                >
                  一键拷贝
                </Button>
              </div>
              <Observer>
                {() => (
                  <Tree
                    onDrop={onDrop}
                    treeData={baseMenu}
                    droppableId={'source'}
                    notDragKeys={MenuSettingModel.notDragKeys}
                  />
                )}
              </Observer>
            </div>
            <div style={{ display: 'flex', alignItems: 'center' }}>
              <div className={'menu-tree-drag-btn'}>
                请拖动至右侧
                <RightOutlined />
              </div>
            </div>

            <div className={'menu-tree right-tree'}>
              <div className={'menu-tree-title'}>
                <div>
                  <span style={{ paddingRight: 12 }}>系统菜单</span>
                  <Tooltip title={'菜单管理页面配置的菜单数据'}>
                    <QuestionCircleOutlined />
                  </Tooltip>
                </div>
              </div>
              <Observer>
                {() => (
                  <>
                    <Tree
                      onTreeDrop={onTreeDrop}
                      onDrop={onDrop}
                      treeData={MenuSettingModel.menuData}
                      droppableId={'menu'}
                      removeDragItem={removeDragItem}
                    />
                  </>
                )}
              </Observer>
            </div>
          </DndProvider>
        </div>
        <div>
          <Button type={'primary'} style={{ marginTop: 24 }} onClick={updateMenu} loading={loading}>
            保存
          </Button>
        </div>
      </div>
    </PageContainer>
  );
});