import { PureComponent, createRef } from 'react';
import Box from '@mui/material/Box';
import Button from '@mui/material/Button';
import Chip from '@mui/material/Chip';
import CircularProgress from '@mui/material/CircularProgress';
import IconButton from '@mui/material/IconButton';
import ListItemButton from '@mui/material/ListItemButton';
import Typography from '@mui/material/Typography';
import Skeleton from '@mui/material/Skeleton';
import Tooltip from '@mui/material/Tooltip';
import DeleteOutlinedIcon from '@mui/icons-material/DeleteOutlined';
import PictureAsPdfIcon from '@mui/icons-material/PictureAsPdf';
import ViewModuleIcon from '@mui/icons-material/ViewModule';
import { enqueueSnackbar } from 'notistack';
import SingleLineTextEdit from 'dashgui/SingleLineTextEdit';
import FillSpace from 'dashgui/FillSpace';
import { PanelTile, PanelTileGrid } from 'dashgui/panels';
import BackendError from '../BackendError';
import SkeleHashImage from '../settings/SkeleHashImage';
import quoteAutomat, { CHUNK_SIZE } from '../../automats/quoteAutomat';
import numberAutomat from '../../automats/numberAutomat';
import { quote as quoteApi } from '../../api';
import { backendErrorFrom } from '../../utils/backendError';
import { notifyError } from '../../utils/notify';
import { formatPrice } from '../../utils/price';
import { getMaxDocumentNumber } from '../../utils/documentNumber';
import PartyFilterPanel, { PartyFilterButton, PartyFilterChip } from './PartyFilterPanel';
import withNavigate from '../withNavigate';
import {
  formatDate,
  loadParties,
  manifestConfig,
  partyDisplayName,
} from './manifestConfig';

// MARK: pure helpers
function quoteGrossTotal(lines) {
  if (!Array.isArray(lines)) return 0;
  return lines.reduce((acc, line) => {
    const net = (Number(line.amount) || 0) * (Number(line.net) || 0) * (1 - (Number(line.rebate) || 0) / 100);
    return acc + net * (1 + (Number(line.taxrate) || 0) / 100);
  }, 0);
}

const cfg = manifestConfig('quote');

// Dummy quote generator using the active sequence scheme with max digits for layout testing
export function createDummyTestQuote() {
  const maxNumber = getMaxDocumentNumber('quote');
  return {
    id: 999999,
    number: maxNumber,
    date: '2030-10-30T12:00:00Z',
    customerName: 'Kunde',
    positions: 999,
    grossTotal: 30000.90,
    files: [
      {
        id: 99991,
        manifestId: 999999,
        fileId: 99991,
        name: `angebot-${maxNumber}.pdf`,
        mimetype: 'application/pdf',
        size: 2701,
        thumbx: 141,
        thumby: 200,
        skeledash: '6w5VujjmxhSpoO8VSwebe2yXU3Tj4108PysbXPqoHmyYcs9oXH8z6npbrjwK90StUBOXY0LLPiDgZy9qjYjkFDVKSjUp3dcWQ',
      },
      {
        id: 99992,
        manifestId: 999999,
        fileId: 99992,
        name: 'datenblatt-muster.pdf',
        mimetype: 'application/pdf',
        size: 15420,
        thumbx: 141,
        thumby: 200,
        skeledash: '6w5VujjmxhSpoO8VSwebe2yXU3Tj4108PysbXPqoHmyYcs9oXH8z6npbrjwK90StUBOXY0LLPiDgZy9qjYjkFDVKSjUp3dcWQ',
      },
    ],
  };
}

const rowGridSx = {
  display: 'grid',
  gridTemplateColumns: 'max-content max-content 1fr max-content max-content max-content auto',
  gridTemplateRows: '0px 1fr',
  rowGap: 0,
  columnGap: 1.5,
  alignItems: 'center',
  width: '100%',
  boxSizing: 'border-box',
};

const ellipsisSx = { overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' };

const measuringCellSx = {
  visibility: 'hidden',
  height: 0,
  boxSizing: 'border-box',
  pointerEvents: 'none',
  textTransform: 'none',
  letterSpacing: 'normal',
};

const headerCellSx = {
  color: 'text.secondary',
  typography: 'caption',
  fontWeight: 600,
  textTransform: 'uppercase',
  letterSpacing: '0.04em',
  userSelect: 'none',
};

function renderInvisibleDummyRow(dummy) {
  const d = dummy || createDummyTestQuote();
  return (
    <>
      <Box aria-hidden sx={{ gridColumn: 1, gridRow: 1, whiteSpace: 'nowrap', ...measuringCellSx }}>
        <Typography variant="body1" sx={{ fontWeight: 600, fontFamily: 'monospace' }}>{d.number}</Typography>
      </Box>
      <Box aria-hidden sx={{ gridColumn: 2, gridRow: 1, whiteSpace: 'nowrap', ...measuringCellSx }}>
        <Typography variant="body2">{d.date ? formatDate(d.date) : '–'}</Typography>
      </Box>
      <Box aria-hidden sx={{ gridColumn: 3, gridRow: 1, whiteSpace: 'nowrap', ...measuringCellSx }}>
        <Typography variant="body1">{d.customerName}</Typography>
      </Box>
      <Box aria-hidden sx={{ gridColumn: 4, gridRow: 1, display: 'flex', justifyContent: 'center', ...measuringCellSx }}>
        <Chip size="small" label={d.positions} sx={{ height: 24, '& .MuiChip-label': { px: 0.5 } }} />
      </Box>
      <Box aria-hidden sx={{ gridColumn: 5, gridRow: 1, display: 'flex', gap: '3px', alignItems: 'center', whiteSpace: 'nowrap', ...measuringCellSx }}>
        {(d.files || []).map((file, i) => (
          <Box key={file.id ?? file.fileId ?? i} sx={{ width: 15, height: 20, flexShrink: 0 }} />
        ))}
      </Box>
      <Box aria-hidden sx={{ gridColumn: 6, gridRow: 1, whiteSpace: 'nowrap', display: 'flex', justifyContent: 'flex-end', ...measuringCellSx }}>
        <Typography variant="body2" sx={{ fontWeight: 600, fontVariantNumeric: 'tabular-nums' }}>
          {formatPrice(d.grossTotal)}
        </Typography>
      </Box>
      <Box aria-hidden sx={{ gridColumn: 7, gridRow: 1, display: 'flex', justifyContent: 'center', ...measuringCellSx }}>
        <IconButton sx={{ width: 40, height: 40 }} />
      </Box>
    </>
  );
}

/**
 * Ambient context for `QuoteRow`: FillSpace renders rows as bare elements
 * (`<Row item index />`), so the list publishes callbacks and the dummy quote here on every render.
 */
const rowContext = {
  partiesById: {},
  busyId: null,
  onOpen: null,
  onDelete: null,
  headerItem: null,
};

// MARK: <QuoteRow/>
class QuoteRow extends PureComponent {
  partyName(partyId) {
    if (partyId == null) return '–';
    const party = rowContext.partiesById[partyId];
    return partyDisplayName('quote', party) || `Kunde #${partyId}`;
  }

  render() {
    const { item: quote, disabled } = this.props;
    const dummy = this.props.headerItem || rowContext.headerItem;

    // Data-free probe (FillSpace measures the row height with `item` undefined).
    if (!quote) {
      if (disabled) {
        return (
          <ListItemButton disabled divider sx={{ ...rowGridSx, height: 64, minHeight: 64, maxHeight: 64, px: 2, py: 0, opacity: 0, pointerEvents: 'none' }}>
            <Typography variant="body2">&nbsp;</Typography>
          </ListItemButton>
        );
      }
      return (
        <ListItemButton disabled divider sx={{ ...rowGridSx, height: 64, minHeight: 64, maxHeight: 64, px: 2, py: 0 }}>
          {renderInvisibleDummyRow(dummy)}
          <Box sx={{ gridColumn: 1, gridRow: 2 }}><Skeleton variant="text" width="90%" height={20} /></Box>
          <Box sx={{ gridColumn: 2, gridRow: 2 }}><Skeleton variant="text" width="90%" height={20} /></Box>
          <Box sx={{ gridColumn: 3, gridRow: 2 }}><Skeleton variant="text" width="60%" height={20} /></Box>
          <Box sx={{ gridColumn: 4, gridRow: 2, display: 'flex', justifyContent: 'center' }}><Skeleton variant="rounded" width={28} height={20} /></Box>
          <Box sx={{ gridColumn: 5, gridRow: 2, display: 'flex', alignItems: 'center', gap: '3px' }}><Skeleton variant="rounded" width={15} height={20} /></Box>
          <Box sx={{ gridColumn: 6, gridRow: 2, display: 'flex', justifyContent: 'flex-end' }}><Skeleton variant="text" width="80%" height={20} /></Box>
          <Box sx={{ gridColumn: 7, gridRow: 2 }} />
        </ListItemButton>
      );
    }

    const { busyId, onOpen, onDelete } = rowContext;
    const posCount = quote.positions != null ? quote.positions : (quote.lines?.length ?? 0);
    const gross = quote.grossTotal != null ? Number(quote.grossTotal) : quoteGrossTotal(quote.lines);
    const customer = quote.customerName || this.partyName(quote.entityId);
    const quantityInfo = quote.totalQuantity != null ? ` · ${quote.totalQuantity} Stück` : '';
    const files = Array.isArray(quote.files) ? quote.files : [];

    return (
      <ListItemButton
        divider
        sx={{ ...rowGridSx, height: 64, minHeight: 64, maxHeight: 64, px: 2, py: 0 }}
        onClick={disabled ? undefined : () => onOpen?.(quote)}
        disabled={disabled}
      >
        {renderInvisibleDummyRow(dummy)}

        <Box sx={{ gridColumn: 1, gridRow: 2, minWidth: 0, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>
          <Typography variant="body1" sx={{ fontWeight: 600, fontFamily: 'monospace', ...ellipsisSx }}>
            {quote.number}
          </Typography>
        </Box>

        <Box sx={{ gridColumn: 2, gridRow: 2, minWidth: 0, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>
          <Typography variant="body2" color="text.secondary" sx={ellipsisSx}>
            {quote.date ? formatDate(quote.date) : '–'}
          </Typography>
        </Box>

        <Box sx={{ gridColumn: 3, gridRow: 2, minWidth: 0, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>
          <Typography variant="body1" sx={{ fontWeight: 500, ...ellipsisSx }}>
            {customer}
          </Typography>
        </Box>

        <Box sx={{ gridColumn: 4, gridRow: 2, display: 'flex', justifyContent: 'center' }}>
          <Chip
            size="small"
            label={posCount}
            title={`${posCount} Positionen${quantityInfo}`}
            sx={{
              height: 24,
              fontSize: '0.75rem',
              fontWeight: 600,
              fontVariantNumeric: 'tabular-nums',
              bgcolor: 'action.hover',
              color: posCount > 0 ? 'text.primary' : 'text.disabled',
              '& .MuiChip-label': { px: 0.5 },
            }}
          />
        </Box>

        {/* Files / Attachments column after Pos.: space for 2 per row, 2 lines max (up to 4 thumbnails) */}
        <Box
          sx={{
            gridColumn: 5,
            gridRow: 2,
            display: 'flex',
            flexWrap: 'wrap',
            alignContent: 'center',
            gap: '3px',
            maxHeight: 44,
            overflow: 'hidden',
            width: 0,
            minWidth: '100%',
          }}
        >
          {files.slice(0, 4).map((file, index) => {
            const fileId = file.fileId ?? file.id;
            const title = file.name ? `${file.name} (Öffnen)` : 'Datei öffnen';
            return (
              <Tooltip key={file.id ?? fileId ?? index} title={title}>
                <Box
                  role="button"
                  tabIndex={0}
                  onClick={(e) => {
                    e.stopPropagation();
                    if (quote.id != null && fileId != null) {
                      window.open(`/api/quote/${encodeURIComponent(quote.id)}/file/${encodeURIComponent(fileId)}`, '_blank');
                    } else {
                      onOpen?.(quote);
                    }
                  }}
                  onKeyDown={(e) => {
                    if (e.key === 'Enter' || e.key === ' ') {
                      e.stopPropagation();
                      e.preventDefault();
                      if (quote.id != null && fileId != null) {
                        window.open(`/api/quote/${encodeURIComponent(quote.id)}/file/${encodeURIComponent(fileId)}`, '_blank');
                      }
                    }
                  }}
                  sx={{
                    width: 15,
                    height: 20,
                    flexShrink: 0,
                    borderRadius: 0.5,
                    overflow: 'hidden',
                    bgcolor: 'background.paper',
                    border: '1px solid',
                    borderColor: 'divider',
                    boxShadow: '0 1px 2px rgba(0,0,0,0.08)',
                    display: 'flex',
                    alignItems: 'center',
                    justifyContent: 'center',
                    cursor: 'pointer',
                    transition: 'transform 120ms ease, box-shadow 120ms ease, border-color 120ms ease',
                    '&:hover': {
                      boxShadow: '0 2px 6px rgba(0,0,0,0.25)',
                      borderColor: 'primary.main',
                      transform: 'scale(1.3)',
                      zIndex: 3,
                    },
                  }}
                >
                  {file.skeledash ? (
                    <SkeleHashImage hash={file.skeledash} />
                  ) : (
                    <PictureAsPdfIcon sx={{ fontSize: 11, color: 'error.main' }} />
                  )}
                </Box>
              </Tooltip>
            );
          })}
        </Box>

        <Box sx={{ gridColumn: 6, gridRow: 2, display: 'flex', justifyContent: 'flex-end' }}>
          <Typography
            variant="body2"
            sx={{ fontWeight: 600, fontVariantNumeric: 'tabular-nums', textAlign: 'right', whiteSpace: 'nowrap' }}
          >
            {gross > 0 ? formatPrice(gross) : '—'}
          </Typography>
        </Box>

        <Box sx={{ gridColumn: 7, gridRow: 2, display: 'flex', justifyContent: 'center' }}>
          <IconButton
            aria-label={`„${quote.number}“ löschen`}
            disabled={busyId != null || disabled}
            onClick={(e) => {
              e.stopPropagation();
              onDelete?.(quote);
            }}
            onMouseDown={(e) => e.stopPropagation()}
            sx={{ width: 40, height: 40 }}
          >
            <DeleteOutlinedIcon sx={{ fontSize: 24 }} />
          </IconButton>
        </Box>
      </ListItemButton>
    );
  }
}

// MARK: <QuoteSearchField/>
class QuoteSearchField extends PureComponent {
  constructor(props) {
    super(props);
    const s = quoteAutomat.state;
    const stats = quoteAutomat.getChunkStats?.();
    this.state = {
      input: s.filter ?? '',
      seekMonths: s.seekMonths ?? 0,
      seekYears: s.seekYears ?? 0,
      negativeSeekMonths: s.negativeSeekMonths ?? 0,
      lruChunksCount: stats?.lruChunksCount || 0,
      maxLruChunks: stats?.maxLruChunks || 50,
      filterCachesCount: stats?.filterCaches?.length || 1,
    };
  }

  componentDidMount() {
    this.unsub = quoteAutomat.subscribe(this, (state) => ({
      input: state.filter ?? '',
      seekMonths: state.seekMonths ?? 0,
      seekYears: state.seekYears ?? 0,
      negativeSeekMonths: state.negativeSeekMonths ?? 0,
    }));
    if (import.meta.env.DEV) {
      this.unsubStats = quoteAutomat.subscribeChunkStats?.((stats) => {
        this.setState({
          lruChunksCount: stats.lruChunksCount,
          maxLruChunks: stats.maxLruChunks,
          filterCachesCount: stats.filterCaches?.length || 1,
        });
      });
    }
  }

  componentWillUnmount() {
    this.unsub?.();
    this.unsubStats?.();
  }

  render() {
    const {
      inputRef,
      onCreate,
      customerFilterOpen,
      onToggleCustomerFilter,
      selectedCustomer,
      onClearCustomerFilter,
    } = this.props;
    const { input, seekMonths, seekYears } = this.state;
    const monthActive = seekMonths > 0;
    const monthLabel = !monthActive ? '-1 Month' : `-${seekMonths} Month${seekMonths > 1 ? 's' : ''}`;
    const yearActive = seekYears > 0;
    const yearLabel = !yearActive ? '-1 Year' : `-${seekYears} Year${seekYears > 1 ? 's' : ''}`;

    return (
      <PanelTileGrid>
        <Box
          ref={inputRef}
          sx={{
            gridColumn: { xs: '1 / -1', sm: 'span 2', md: 'span 2' },
            display: 'flex',
            flexDirection: 'column',
            gap: 1.25,
            pb: 2,
          }}
        >
          {/* Top row: search field & create button */}
          <Box
            sx={{
              display: 'flex',
              alignItems: 'center',
              gap: 1,
            }}
          >
            <SingleLineTextEdit
              sx={{ flex: 1 }}
              size="small"
              search
              clear
              value={input}
              onChange={(next) => quoteAutomat.actions.filter(next)}
            />
            <PartyFilterButton
              title="Kunden"
              open={customerFilterOpen}
              onClick={onToggleCustomerFilter}
            />
            {selectedCustomer && (
              <PartyFilterChip
                label={partyDisplayName('quote', selectedCustomer)}
                onDelete={onClearCustomerFilter}
              />
            )}
            <Button variant="contained" onClick={onCreate}>
              {cfg.createButton}
            </Button>
          </Box>

          {/* Filter Bar: Negativeseek (-1 Month, -1 Year, Reset) & Chunk-Cache Monitor */}
          <Box
            sx={{
              display: 'flex',
              alignItems: 'center',
              justifyContent: 'flex-end',
              flexWrap: 'wrap',
              gap: 1.5,
            }}
          >
            {/* Negativeseek controls (-1 Month, -1 Year, Reset) */}
            <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, flexWrap: 'wrap' }}>
              <Box
                sx={{
                  display: 'inline-flex',
                  alignItems: 'center',
                  gap: 0.75,
                  px: 1.25,
                  py: 0.25,
                  borderRadius: 2,
                  bgcolor: 'background.paper',
                  boxShadow: 1,
                }}
              >
                <Button
                  size="small"
                  variant={monthActive ? 'contained' : 'outlined'}
                  color={monthActive ? 'primary' : 'inherit'}
                  onClick={() => quoteAutomat.actions.addSeekMonth()}
                  sx={{
                    minWidth: 88,
                    px: 1.25,
                    py: 0.25,
                    height: 28,
                    fontSize: '0.75rem',
                    fontWeight: 600,
                    textTransform: 'none',
                    boxSizing: 'border-box',
                    border: '1px solid',
                    borderColor: monthActive ? 'primary.main' : 'divider',
                    whiteSpace: 'nowrap',
                  }}
                >
                  {monthLabel}
                </Button>

                <Button
                  size="small"
                  variant={yearActive ? 'contained' : 'outlined'}
                  color={yearActive ? 'primary' : 'inherit'}
                  onClick={() => quoteAutomat.actions.addSeekYear()}
                  sx={{
                    minWidth: 78,
                    px: 1.25,
                    py: 0.25,
                    height: 28,
                    fontSize: '0.75rem',
                    fontWeight: 600,
                    textTransform: 'none',
                    boxSizing: 'border-box',
                    border: '1px solid',
                    borderColor: yearActive ? 'primary.main' : 'divider',
                    whiteSpace: 'nowrap',
                  }}
                >
                  {yearLabel}
                </Button>

                <Button
                  size="small"
                  variant="text"
                  color="inherit"
                  disabled={!monthActive && !yearActive}
                  onClick={() => quoteAutomat.actions.resetNegativeSeek()}
                  sx={{
                    minWidth: 'auto',
                    px: 1,
                    py: 0.25,
                    height: 28,
                    fontSize: '0.75rem',
                    fontWeight: 600,
                    textTransform: 'none',
                  }}
                >
                  Reset
                </Button>
              </Box>

              {import.meta.env.DEV && (
                <Tooltip title={`Chunk-Cache-Monitor öffnen (Alt+Shift+C) — ${this.state.lruChunksCount || 0}/${this.state.maxLruChunks || 50} Chunks im RAM über ${this.state.filterCachesCount || 1} Filter`}>
                  <Chip
                    size="small"
                    icon={<ViewModuleIcon sx={{ fontSize: 16 }} />}
                    label={this.state.lruChunksCount > 0 ? `Chunk-Cache (${this.state.lruChunksCount}/${this.state.maxLruChunks || 50})` : 'Chunk-Cache'}
                    onClick={() => window.dispatchEvent(new CustomEvent('dash:toggle-chunk-monitor', { detail: { target: 'quote' } }))}
                    sx={{
                      cursor: 'pointer',
                      height: 28,
                      fontWeight: 600,
                      fontSize: '0.75rem',
                      bgcolor: 'background.paper',
                      boxShadow: 1,
                      '&:hover': { bgcolor: 'action.hover' },
                    }}
                  />
                </Tooltip>
              )}
            </Box>
          </Box>
        </Box>
      </PanelTileGrid>
    );
  }
}

// MARK: <QuoteList/>
export class QuoteList extends PureComponent {
  constructor(props) {
    super(props);
    this.headerItem = createDummyTestQuote();
    this.state = {
      items: quoteAutomat.getItems(),
      unfilteredTotal: quoteAutomat.state.unfilteredTotal ?? 0,
      filterKey: quoteAutomat.getFilterKey?.() ?? '',
      entityId: quoteAutomat.state.entityId ?? null,
      customerFilterOpen: false,
      partiesById: {},
      partiesList: [],
      busyId: null,
    };
    this.searchRef = createRef();
    this._cancelled = false;
    this.handleRetry = this.handleRetry.bind(this);
    this.handleCreate = this.handleCreate.bind(this);
    this.handleOpen = this.handleOpen.bind(this);
    this.handleDelete = this.handleDelete.bind(this);
    this.handlePageChange = this.handlePageChange.bind(this);
    this.handleToggleCustomerFilter = this.handleToggleCustomerFilter.bind(this);
    this.handleSelectCustomer = this.handleSelectCustomer.bind(this);
  }

  componentDidMount() {
    this._cancelled = false;
    this.unsub = quoteAutomat.subscribe(this, (state) => ({
      items: state.items,
      unfilteredTotal: state.unfilteredTotal ?? 0,
      filterKey: quoteAutomat.getFilterKey(state),
      entityId: state.entityId ?? null,
    }));
    this.unsubNumber = numberAutomat.subscribe(this, () => {
      this.headerItem = createDummyTestQuote();
      this.forceUpdate();
    });
    void numberAutomat.actions.ensureLoaded().catch(() => { });
    void this.loadParties();
  }

  componentWillUnmount() {
    this._cancelled = true;
    this.unsub?.();
    this.unsubNumber?.();
  }

  handleToggleCustomerFilter() {
    this.setState((prev) => ({ customerFilterOpen: !prev.customerFilterOpen }));
  }

  handleSelectCustomer(entityId) {
    quoteAutomat.actions.setEntityId(entityId);
  }

  async loadParties() {
    try {
      const parties = await loadParties('quote');
      if (!this._cancelled) {
        this.setState({
          partiesById: cfg.partiesByIdFromList(parties),
          partiesList: parties || [],
        });
      }
    } catch {
      // Non-fatal: names fall back to ids or customerName.
    }
  }

  handlePageChange(page, meta) {
    const pageSize = meta?.pageSize ?? 10;
    const startIndex = (page - 1) * pageSize;
    const items = this.state.items;
    const maxIndex = items ? items.length - 1 : startIndex;
    const endIndex = Math.min(maxIndex, startIndex + pageSize - 1);

    const startChunk = Math.floor(startIndex / CHUNK_SIZE);
    const endChunk = Math.floor(endIndex / CHUNK_SIZE);

    quoteAutomat.requireChunk(startChunk, endChunk);
  }

  handleRetry() {
    void quoteAutomat.actions.requireChunk(0, 0, { immediate: true }).catch(() => { });
  }

  handleCreate() {
    this.props.navigate(cfg.createPath);
  }

  handleOpen(quote) {
    if (quote.id === 999999) {
      enqueueSnackbar(`Test-Angebot „${quote.number}“ angeklickt.`, { variant: 'info' });
      return;
    }
    this.props.navigate(cfg.editPath(quote.id));
  }

  async handleDelete(quote) {
    if (quote.id === 999999) {
      enqueueSnackbar('Test-Angebot kann nicht gelöscht werden.', { variant: 'info' });
      return;
    }
    if (this.state.busyId != null) return;
    if (!window.confirm(cfg.confirmDelete(quote.number))) return;
    this.setState({ busyId: quote.id });
    try {
      await quoteApi.delete(quote.id);
      await quoteAutomat.actions.reload();
      enqueueSnackbar(cfg.deletedMsg, { variant: 'success' });
    } catch (err) {
      notifyError(err);
    } finally {
      if (!this._cancelled) this.setState({ busyId: null });
    }
  }

  render() {
    const {
      items,
      unfilteredTotal,
      filterKey,
      entityId,
      customerFilterOpen,
      partiesById,
      partiesList,
      busyId,
    } = this.state;

    rowContext.partiesById = partiesById;
    rowContext.busyId = busyId;
    rowContext.onOpen = this.handleOpen;
    rowContext.onDelete = this.handleDelete;
    rowContext.headerItem = this.headerItem;

    const customerCounts = {};
    if (Array.isArray(items)) {
      for (const q of items) {
        if (q?.entityId) {
          customerCounts[q.entityId] = (customerCounts[q.entityId] || 0) + 1;
        }
      }
    }
    const selectedCustomer = entityId ? (partiesById[entityId] || { id: entityId, name: `Kunde #${entityId}` }) : null;

    const searchField = (
      <QuoteSearchField
        inputRef={this.searchRef}
        onCreate={this.handleCreate}
        customerFilterOpen={customerFilterOpen}
        onToggleCustomerFilter={this.handleToggleCustomerFilter}
        selectedCustomer={selectedCustomer}
        onClearCustomerFilter={() => this.handleSelectCustomer(null)}
      />
    );

    if (items === null && quoteAutomat.state.status === 'failed') {
      return (
        <>
          {searchField}
          <PanelTileGrid>
            <PanelTile wide={3} minHeight={0} color={cfg.listColor} sx={{ p: 2 }}>
              <BackendError error={backendErrorFrom(quoteAutomat.state.error)} onRetry={this.handleRetry} />
            </PanelTile>
          </PanelTileGrid>
        </>
      );
    }

    return (
      <>
        {searchField}
        <Box sx={{ display: 'flex', gap: 2.5, alignItems: 'stretch' }}>
          {customerFilterOpen && (
            <PartyFilterPanel
              title="Kunden"
              parties={partiesList}
              selectedId={entityId}
              onSelect={this.handleSelectCustomer}
              onClose={this.handleToggleCustomerFilter}
              counts={customerCounts}
              searchPlaceholder="Kunde suchen…"
            />
          )}
          <Box sx={{ flexGrow: 1, minWidth: 0 }}>
            <PanelTileGrid>
              <PanelTile wide={3} minHeight={0} color={cfg.listColor} sx={{ pb: 0, position: 'relative' }}>
                <FillSpace
                  aboveRef={[this.searchRef]}
                  reserveBottom={32}
                  minPageSize={8}
                  minHeight={0}
                  resetKey={filterKey}
                  items={items || []}
                  totalCount={items ? items.length : 0}
                  unfilteredTotal={unfilteredTotal}
                  headerItem={this.headerItem}
                  renderItem={QuoteRow}
                  virtualScrollbar
                  header={
                    <Box
                      sx={{
                        ...rowGridSx,
                        height: 36,
                        minHeight: 36,
                        px: 2,
                        borderBottom: '1px solid',
                        borderColor: 'divider',
                      }}
                    >
                      {renderInvisibleDummyRow(this.headerItem)}
                      <Box sx={{ gridColumn: 1, gridRow: 2, ...headerCellSx }}>Nr.</Box>
                      <Box sx={{ gridColumn: 2, gridRow: 2, ...headerCellSx }}>Datum</Box>
                      <Box sx={{ gridColumn: 3, gridRow: 2, ...headerCellSx }}>Kunde</Box>
                      <Box sx={{ gridColumn: 4, gridRow: 2, display: 'flex', justifyContent: 'center', textAlign: 'center', ...headerCellSx }}>Pos.</Box>
                      <Box sx={{ gridColumn: 5, gridRow: 2, textAlign: 'left', minWidth: 0, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap', ...headerCellSx }}></Box>
                      <Box sx={{ gridColumn: 6, gridRow: 2, textAlign: 'right', ...headerCellSx }}>Gesamt</Box>
                      <Box sx={{ gridColumn: 7, gridRow: 2, ...headerCellSx }} />
                    </Box>
                  }
                  onPageChange={this.handlePageChange}
                />
                {items === null && (
                  <Box
                    sx={{
                      position: 'absolute',
                      top: 52,
                      left: 0,
                      right: 0,
                      bottom: 32,
                      display: 'flex',
                      alignItems: 'center',
                      justifyContent: 'center',
                      pointerEvents: 'none',
                      zIndex: 2,
                    }}
                  >
                    <CircularProgress size={32} />
                  </Box>
                )}
              </PanelTile>
            </PanelTileGrid>
          </Box>
        </Box>
      </>
    );
  }
}

export default withNavigate(QuoteList);