import React, { useContext } from 'react';
import { WindowScroller, AutoSizer, List } from 'react-virtualized';
import { CLASSES } from 'common/classes';
import TableContext from './TableContext';

/**
 * Table virtualized list row.
 */
function TableVirtualizedListRow({
  index,
  isScrolling,
  isVisible,
  style,
}) {
  const {
    table: { page, prepareRow },
    props: { TableRowRenderer },
  } = useContext(TableContext);

  const row = page[index];
  prepareRow(row);

  return (<TableRowRenderer row={row} style={style} />);
}

/**
 * Table virtualized list rows.
 */
export default function TableVirtualizedListRows() {
  const {
    table: { page },
    props: { vListrowHeight, vListOverscanRowCount },
  } = useContext(TableContext);

  // Dashboard content pane.
  const dashboardContentPane = React.useMemo(()=> document.querySelector(
    `.${CLASSES.DASHBOARD_CONTENT_PANE}`,
  ), []);

  const rowRenderer = React.useCallback(({ key, ...args }) => (
    <TableVirtualizedListRow {...args} key={key} />
  ), []);

  return (
    <WindowScroller scrollElement={dashboardContentPane}>
      {({ height, isScrolling, onChildScroll, scrollTop }) => (
        <AutoSizer disableHeight>
          {({ width }) => (
            <List
              autoHeight={true}
              className={'List'}
              height={height}
              isScrolling={isScrolling}
              onScroll={onChildScroll}
              overscanRowCount={vListOverscanRowCount}
              rowCount={page.length}
              rowHeight={vListrowHeight}
              rowRenderer={rowRenderer}
              scrollTop={scrollTop}
              width={width}
            />
          )}
        </AutoSizer>
      )}
    </WindowScroller>
  );
}