teableio / teable / 8370273405

import type { IRecord, IGetRecordsRo } from '@teable/core';

import { inRange, debounce } from 'lodash';

import { useCallback, useEffect, useRef, useState, useMemo } from 'react';

import type { IGridProps, IRectangle } from '../..';

import { useTableId } from '../../../hooks';

import { useRecords } from '../../../hooks/use-records';

import { useViewId } from '../../../hooks/use-view-id';

import { Record } from '../../../model';

// eslint-disable-next-line

export const LOAD_PAGE_SIZE = 300;

const defaultVisiblePages = { x: 0, y: 0, width: 0, height: 0 };

type IRes = {

  recordMap: IRecordIndexMap;

  onReset: () => void;

  onForceUpdate: () => void;

  onRowOrdered: (rowIndexCollection: number[], newRowIndex: number) => void;

  onVisibleRegionChanged: NonNullable<IGridProps['onVisibleRegionChanged']>;

};

export type IRecordIndexMap = { [i: number | string]: Record };

export const useGridAsyncRecords = (

  initRecords?: IRecord[],

  initQuery?: IGetRecordsRo,

  outerQuery?: Pick<IGetRecordsRo, 'filter' | 'orderBy' | 'groupBy'>

): IRes => {

  const [query, setQuery] = useState<IGetRecordsRo>({

    skip: 0,

    take: LOAD_PAGE_SIZE,

    ...initQuery,

  });

  const recordsQuery = useMemo(() => ({ ...query, ...outerQuery }), [query, outerQuery]);

  const tableId = useTableId();

  const viewId = useViewId();

  const queryRef = useRef(query);

  queryRef.current = query;

  const records = useRecords(recordsQuery, initRecords);

  const [loadedRecordMap, setLoadedRecordMap] = useState<IRecordIndexMap>(() =>

    records.reduce((acc, record, i) => {

      acc[i] = record;

      return acc;

    }, {} as IRecordIndexMap)

  );

  const [visiblePages, setVisiblePages] = useState<IRectangle>(defaultVisiblePages);

  const visiblePagesRef = useRef(visiblePages);

  visiblePagesRef.current = visiblePages;

  const onForceUpdate = useCallback(() => {

    const startIndex = queryRef.current.skip ?? 0;

    const take = queryRef.current.take ?? LOAD_PAGE_SIZE;

    setLoadedRecordMap((preLoadedRecords) => {

      const cacheLen = take * 2;

      const [cacheStartIndex, cacheEndIndex] = [

        Math.max(startIndex - cacheLen / 2, 0),

        startIndex + records.length + cacheLen / 2,

      ];

      const newRecordsState: IRecordIndexMap = {};

      for (let i = cacheStartIndex; i < cacheEndIndex; i++) {

        if (startIndex <= i && i < startIndex + records.length) {

          newRecordsState[i] = records[i - startIndex];

          continue;

        }

        newRecordsState[i] = preLoadedRecords[i];

      }

      return newRecordsState;

    });

  }, [records]);

  useEffect(() => onForceUpdate(), [onForceUpdate]);

  useEffect(() => {

    const { y, height } = visiblePages;

    setQuery((cv) => {

      if (cv.skip === undefined) {

        return cv;

      }

      const take = initQuery?.take ?? cv.take ?? LOAD_PAGE_SIZE;

      const pageOffsetSize = take / 3;

      const pageGap = take / 3;

      const visibleStartIndex = cv.skip <= y ? cv.skip - pageOffsetSize : cv.skip + pageOffsetSize;

      const visibleEndIndex = visibleStartIndex + take;

      const viewInRange =

        inRange(y, visibleStartIndex, visibleEndIndex) &&

        inRange(y + height, visibleStartIndex, visibleEndIndex);

      if (!viewInRange) {

        const skip = Math.floor(y / pageGap) * pageGap - pageGap;

        return {

          take: cv.take,

          ...initQuery,

          skip: Math.max(0, skip),

        };

      }

      return {

        take: cv.take,

        ...initQuery,

        skip: cv.skip,

      };

    });

  }, [visiblePages, initQuery]);

  const updateVisiblePages = useMemo(() => {

    return debounce(setVisiblePages, 30, { maxWait: 500 });

  }, []);

  const onVisibleRegionChanged: NonNullable<IGridProps['onVisibleRegionChanged']> = useCallback(

    (r) => {

      const { y, height } = visiblePagesRef.current;

      if (r.y === y && r.height === height) return;

      updateVisiblePages(r);

    },

    [updateVisiblePages]

  );

  const onReset = useCallback(() => {

    setLoadedRecordMap({});

    setVisiblePages(defaultVisiblePages);

  }, []);

  const onRowOrdered = useCallback(

    (rowIndexCollection: number[], newRowIndex: number) => {

      const operationRecordIds: string[] = [];

      for (const rowIndex of rowIndexCollection) {

        const record = loadedRecordMap[rowIndex];

        if (!record) {

          throw new Error('Can not find record by index: ' + rowIndex);

        }

        operationRecordIds.push(record.id);

      }

      if (!viewId) {

        throw new Error('Can not find view id');

      }

      if (newRowIndex === 0) {

        Record.updateRecordOrders(tableId as string, viewId, {

          anchorId: loadedRecordMap[0].id,

          position: 'before',

          recordIds: operationRecordIds,

        });

        return;

      }

      const record = loadedRecordMap[newRowIndex - 1];

      if (!record) {

        throw new Error("Can't find target record by index: " + newRowIndex);

      }

      Record.updateRecordOrders(tableId as string, viewId, {

        anchorId: record.id,

        position: 'after',

        recordIds: operationRecordIds,

      });

    },

    [viewId, loadedRecordMap, tableId]

  );

  return {

    recordMap: loadedRecordMap,

    onVisibleRegionChanged,

    onRowOrdered,

    onForceUpdate,

    onReset,

  };

};