import React, { useMemo, useRef } from "react";
import { pick, reduce } from "lodash";
import {
  useTable,
  usePagination,
  useBlockLayout,
  useResizeColumns,
  useRowSelect,
  Row,
} from "react-table";
import {
  TableWrapper,
  TableHeaderWrapper,
  TableHeaderInnerWrapper,
} from "./TableStyledWrappers";
import TableHeader from "./TableHeader";
import { Classes } from "@blueprintjs/core";
import {
  ReactTableColumnProps,
  ReactTableFilter,
  TABLE_SIZES,
  CompactMode,
  CompactModeTypes,
} from "./Constants";
import { Colors } from "constants/Colors";

import ScrollIndicator from "components/ads/ScrollIndicator";
import { EventType } from "constants/AppsmithActionConstants/ActionConstants";
import { Scrollbars } from "react-custom-scrollbars";
import { renderEmptyRows } from "./cellComponents/EmptyCell";
import {
  renderBodyCheckBoxCell,
  renderHeaderCheckBoxCell,
} from "./cellComponents/CheckboxCell";
import { HeaderCell } from "./cellComponents/HeaderCell";
import { EditableCell } from "../constants";

interface TableProps {
  width: number;
  height: number;
  pageSize: number;
  widgetId: string;
  widgetName: string;
  searchKey: string;
  isLoading: boolean;
  columnWidthMap?: { [key: string]: number };
  columns: ReactTableColumnProps[];
  data: Array<Record<string, unknown>>;
  totalRecordsCount?: number;
  editMode: boolean;
  editableCell: EditableCell;
  sortTableColumn: (columnIndex: number, asc: boolean) => void;
  handleResizeColumn: (columnWidthMap: { [key: string]: number }) => void;
  selectTableRow: (row: {
    original: Record<string, unknown>;
    index: number;
  }) => void;
  pageNo: number;
  updatePageNo: (pageNo: number, event?: EventType) => void;
  multiRowSelection?: boolean;
  isSortable?: boolean;
  nextPageClick: () => void;
  prevPageClick: () => void;
  serverSidePaginationEnabled: boolean;
  selectedRowIndex: number;
  selectedRowIndices: number[];
  disableDrag: () => void;
  enableDrag: () => void;
  toggleAllRowSelect: (
    isSelect: boolean,
    pageData: Row<Record<string, unknown>>[],
  ) => void;
  triggerRowSelection: boolean;
  searchTableData: (searchKey: any) => void;
  filters?: ReactTableFilter[];
  applyFilter: (filters: ReactTableFilter[]) => void;
  compactMode?: CompactMode;
  isVisibleDownload?: boolean;
  isVisibleFilters?: boolean;
  isVisiblePagination?: boolean;
  isVisibleSearch?: boolean;
  delimiter: string;
  accentColor: string;
  borderRadius: string;
  boxShadow?: string;
  onBulkEditDiscard: () => void;
  onBulkEditSave: () => void;
}

const defaultColumn = {
  minWidth: 30,
  width: 150,
};

function ScrollbarVerticalThumb(props: any) {
  return <div {...props} className="thumb-vertical" />;
}

function ScrollbarHorizontalThumb(props: any) {
  return <div {...props} className="thumb-horizontal" />;
}

export function Table(props: TableProps) {
  const isResizingColumn = React.useRef(false);

  const handleResizeColumn = (columnWidths: Record<string, number>) => {
    const columnWidthMap = {
      ...props.columnWidthMap,
      ...columnWidths,
    };
    for (const i in columnWidthMap) {
      if (columnWidthMap[i] < 60) {
        columnWidthMap[i] = 60;
      } else if (columnWidthMap[i] === undefined) {
        const columnCounts = props.columns.filter((column) => !column.isHidden)
          .length;
        columnWidthMap[i] = props.width / columnCounts;
      }
    }
    props.handleResizeColumn(columnWidthMap);
  };
  const data = React.useMemo(() => props.data, [JSON.stringify(props.data)]);
  const columnString = JSON.stringify(
    pick(props, ["columns", "compactMode", "columnWidthMap"]),
  );
  const columns = React.useMemo(() => props.columns, [columnString]);
  const tableHeadercolumns = React.useMemo(
    () =>
      props.columns.filter((column: ReactTableColumnProps) => {
        return column.alias !== "actions";
      }),
    [columnString],
  );
  const pageCount =
    props.serverSidePaginationEnabled && props.totalRecordsCount
      ? Math.ceil(props.totalRecordsCount / props.pageSize)
      : Math.ceil(props.data.length / props.pageSize);
  const currentPageIndex = props.pageNo < pageCount ? props.pageNo : 0;
  const {
    getTableBodyProps,
    getTableProps,
    headerGroups,
    page,
    pageOptions,
    prepareRow,
    state,
  } = useTable(
    {
      columns: columns,
      data,
      defaultColumn,
      initialState: {
        pageIndex: currentPageIndex,
        pageSize: props.pageSize,
      },
      manualPagination: true,
      pageCount,
    },
    useBlockLayout,
    useResizeColumns,
    usePagination,
    useRowSelect,
  );
  //Set isResizingColumn as true when column is resizing using table state
  if (state.columnResizing.isResizingColumn) {
    isResizingColumn.current = true;
  } else {
    // We are updating column size since the drag is complete when we are changing value of isResizing from true to false
    if (isResizingColumn.current) {
      //update isResizingColumn in next event loop so that dragEnd event does not trigger click event.
      setTimeout(function() {
        isResizingColumn.current = false;
        handleResizeColumn(state.columnResizing.columnWidths);
      }, 0);
    }
  }
  let startIndex = currentPageIndex * props.pageSize;
  let endIndex = startIndex + props.pageSize;
  if (props.serverSidePaginationEnabled) {
    startIndex = 0;
    endIndex = props.data.length;
  }
  const subPage = page.slice(startIndex, endIndex);
  const selectedRowIndex = props.selectedRowIndex;
  const selectedRowIndices = props.selectedRowIndices || [];
  const tableSizes = TABLE_SIZES[props.compactMode || CompactModeTypes.DEFAULT];
  const tableWrapperRef = useRef<HTMLDivElement | null>(null);
  const tableBodyRef = useRef<HTMLDivElement | null>(null);
  const tableHeaderWrapperRef = React.createRef<HTMLDivElement>();
  const rowSelectionState = React.useMemo(() => {
    // return : 0; no row selected | 1; all row selected | 2: some rows selected
    if (!props.multiRowSelection) return null;
    const selectedRowCount = reduce(
      page,
      (count, row) => {
        return selectedRowIndices.includes(row.index) ? count + 1 : count;
      },
      0,
    );
    const result =
      selectedRowCount === 0 ? 0 : selectedRowCount === page.length ? 1 : 2;
    return result;
  }, [selectedRowIndices, page]);
  const handleAllRowSelectClick = (
    e: React.MouseEvent<HTMLDivElement, MouseEvent>,
  ) => {
    // if all / some rows are selected we remove selection on click
    // else select all rows
    props.toggleAllRowSelect(!Boolean(rowSelectionState), page);
    // loop over subPage rows and toggleRowSelected if required
    e.stopPropagation();
  };
  const isHeaderVisible =
    props.isVisibleSearch ||
    props.isVisibleFilters ||
    props.isVisibleDownload ||
    props.isVisiblePagination;

  const style = useMemo(
    () => ({
      width: props.width,
      height: 38,
    }),
    [props.width],
  );

  return (
    <TableWrapper
      accentColor={props.accentColor}
      backgroundColor={Colors.ATHENS_GRAY_DARKER}
      borderRadius={props.borderRadius}
      boxShadow={props.boxShadow}
      height={props.height}
      id={`table${props.widgetId}`}
      isHeaderVisible={isHeaderVisible}
      tableSizes={tableSizes}
      triggerRowSelection={props.triggerRowSelection}
      width={props.width}
    >
      {isHeaderVisible && (
        <TableHeaderWrapper
          backgroundColor={Colors.WHITE}
          ref={tableHeaderWrapperRef}
          serverSidePaginationEnabled={props.serverSidePaginationEnabled}
          tableSizes={tableSizes}
          width={props.width}
        >
          <Scrollbars
            autoHide
            renderThumbHorizontal={ScrollbarHorizontalThumb}
            renderThumbVertical={ScrollbarVerticalThumb}
            style={style}
          >
            <TableHeaderInnerWrapper
              backgroundColor={Colors.WHITE}
              serverSidePaginationEnabled={props.serverSidePaginationEnabled}
              tableSizes={tableSizes}
              width={props.width}
            >
              <TableHeader
                accentColor={props.accentColor}
                applyFilter={props.applyFilter}
                borderRadius={props.borderRadius}
                boxShadow={props.boxShadow}
                columns={tableHeadercolumns}
                currentPageIndex={currentPageIndex}
                delimiter={props.delimiter}
                filters={props.filters}
                isVisibleDownload={props.isVisibleDownload}
                isVisibleFilters={props.isVisibleFilters}
                isVisiblePagination={props.isVisiblePagination}
                isVisibleSearch={props.isVisibleSearch}
                nextPageClick={props.nextPageClick}
                pageCount={pageCount}
                pageNo={props.pageNo}
                pageOptions={pageOptions}
                prevPageClick={props.prevPageClick}
                searchKey={props.searchKey}
                searchTableData={props.searchTableData}
                serverSidePaginationEnabled={props.serverSidePaginationEnabled}
                tableColumns={columns}
                tableData={data}
                tableSizes={tableSizes}
                totalRecordsCount={props.totalRecordsCount}
                updatePageNo={props.updatePageNo}
                widgetId={props.widgetId}
                widgetName={props.widgetName}
              />
            </TableHeaderInnerWrapper>
          </Scrollbars>
        </TableHeaderWrapper>
      )}
      <div
        className={props.isLoading ? Classes.SKELETON : "tableWrap"}
        ref={tableWrapperRef}
      >
        <Scrollbars
          renderThumbHorizontal={ScrollbarHorizontalThumb}
          style={{
            width: props.width,
            height: isHeaderVisible ? props.height - 48 : props.height,
          }}
        >
          <div {...getTableProps()} className="table">
            <div
              className="thead"
              onMouseLeave={props.enableDrag}
              onMouseOver={props.disableDrag}
            >
              {headerGroups.map((headerGroup: any, index: number) => {
                const headerRowProps = {
                  ...headerGroup.getHeaderGroupProps(),
                  style: { display: "flex" },
                };
                return (
                  <div {...headerRowProps} className="tr" key={index}>
                    {props.multiRowSelection &&
                      renderHeaderCheckBoxCell(
                        handleAllRowSelectClick,
                        rowSelectionState,
                        props.accentColor,
                        props.borderRadius,
                      )}
                    {headerGroup.headers.map(
                      (column: any, columnIndex: number) => {
                        return (
                          <HeaderCell
                            column={column}
                            columnIndex={columnIndex}
                            columnName={column.Header}
                            editMode={props.editMode}
                            isAscOrder={column.isAscOrder}
                            isHidden={column.isHidden}
                            isResizingColumn={isResizingColumn.current}
                            isSortable={props.isSortable}
                            key={columnIndex}
                            sortTableColumn={props.sortTableColumn}
                            width={column.width}
                          />
                        );
                      },
                    )}
                  </div>
                );
              })}
              {headerGroups.length === 0 &&
                renderEmptyRows(
                  1,
                  props.columns,
                  props.width,
                  subPage,
                  prepareRow,
                  props.multiRowSelection,
                  props.accentColor,
                  props.borderRadius,
                )}
            </div>
            <div
              {...getTableBodyProps()}
              className={`tbody ${
                props.pageSize > subPage.length ? "no-scroll" : ""
              }`}
              ref={tableBodyRef}
            >
              {subPage.map((row, rowIndex) => {
                prepareRow(row);
                const rowProps = {
                  ...row.getRowProps(),
                  style: { display: "flex" },
                };
                const isRowSelected = props.multiRowSelection
                  ? selectedRowIndices.includes(row.index)
                  : row.index === selectedRowIndex;
                return (
                  <div
                    {...rowProps}
                    className={"tr" + `${isRowSelected ? " selected-row" : ""}`}
                    key={rowIndex}
                    onClick={(e) => {
                      row.toggleRowSelected();
                      props.selectTableRow(row);
                      e.stopPropagation();
                    }}
                  >
                    {props.multiRowSelection &&
                      renderBodyCheckBoxCell(
                        isRowSelected,
                        props.accentColor,
                        props.borderRadius,
                      )}
                    {row.cells.map((cell, cellIndex) => {
                      return (
                        <div
                          {...cell.getCellProps()}
                          className="td"
                          data-colindex={cellIndex}
                          data-rowindex={rowIndex}
                          key={cellIndex}
                        >
                          {cell.render("Cell")}
                        </div>
                      );
                    })}
                  </div>
                );
              })}
              {props.pageSize > subPage.length &&
                renderEmptyRows(
                  props.pageSize - subPage.length,
                  props.columns,
                  props.width,
                  subPage,
                  prepareRow,
                  props.multiRowSelection,
                  props.accentColor,
                  props.borderRadius,
                )}
            </div>
          </div>
        </Scrollbars>
      </div>
      <ScrollIndicator
        containerRef={tableBodyRef}
        mode="LIGHT"
        top={props.editMode ? "70px" : "73px"}
      />
    </TableWrapper>
  );
}

export default Table;