import Alert from '@mui/material/Alert';
import Box from '@mui/material/Box';
import CircularProgress from '@mui/material/CircularProgress';
import CssBaseline from '@mui/material/CssBaseline';
import Paper from '@mui/material/Paper';
import Table from '@mui/material/Table';
import TableBody from '@mui/material/TableBody';
import TableCell from '@mui/material/TableCell';
import TableContainer from '@mui/material/TableContainer';
import TableHead from '@mui/material/TableHead';
import TableRow from '@mui/material/TableRow';
import Typography from '@mui/material/Typography';
import { ThemeProvider } from '@mui/material/styles';
import { useEffect, useMemo, useState } from 'react';
import { useEmbeddedParentTheme } from '../embed/useEmbeddedParentTheme';
import { buildToirMuiTheme } from '../theme/toirMuiTheme';
import { env } from '../config/env';
import { ensureFreshToken, getAccessToken } from '../auth/keycloak';

type EquipmentRecord = {
  id: string;
  name: string;
  serialNumber: string;
  dateOfInspection: string | null;
  commissionedAt: string | null;
  installationDate: string | null;
};

function formatDate(value: string | null) {
  if (!value) {
    return '—';
  }

  const date = new Date(value);
  if (Number.isNaN(date.getTime())) {
    return value;
  }

  return new Intl.DateTimeFormat('ru-RU').format(date);
}

export function EmbeddedActiveEquipmentPage() {
  const paletteMode = useEmbeddedParentTheme();
  const muiTheme = useMemo(
    () => buildToirMuiTheme(paletteMode),
    [paletteMode],
  );

  const [data, setData] = useState<EquipmentRecord[]>([]);
  const [total, setTotal] = useState<number | null>(null);
  const [isPending, setIsPending] = useState(true);
  const [error, setError] = useState<Error | null>(null);

  useEffect(() => {
    let cancelled = false;

    const load = async () => {
      setIsPending(true);
      setError(null);

      try {
        await ensureFreshToken();

        const token = getAccessToken();
        const headers = new Headers({
          Accept: 'application/json',
        });

        if (token) {
          headers.set('Authorization', `Bearer ${token}`);
        }

        const query = new URLSearchParams({
          _start: '0',
          _end: '100',
          _sort: 'name',
          _order: 'ASC',
        });
        query.append('status', 'Active');

        const response = await fetch(`${env.apiUrl}/equipment?${query.toString()}`, {
          headers,
        });

        if (!response.ok) {
          const requestError = new Error(`Request failed with status ${response.status}`) as Error & {
            status?: number;
          };
          requestError.status = response.status;
          throw requestError;
        }

        const payload = (await response.json()) as EquipmentRecord[];
        const contentRange = response.headers.get('Content-Range');
        const parsedTotal = contentRange?.match(/\/(\d+)$/)?.[1];

        if (!cancelled) {
          setData(payload);
          setTotal(parsedTotal ? Number(parsedTotal) : payload.length);
        }
      } catch (caughtError) {
        if (!cancelled) {
          setError(caughtError instanceof Error ? caughtError : new Error('Unknown error'));
        }
      } finally {
        if (!cancelled) {
          setIsPending(false);
        }
      }
    };

    void load();

    return () => {
      cancelled = true;
    };
  }, []);

  return (
    <ThemeProvider theme={muiTheme}>
      <CssBaseline />
      <Box
        sx={{
          minHeight: '100vh',
          boxSizing: 'border-box',
          p: { xs: 2, md: 3 },
          background:
            paletteMode === 'dark'
              ? 'radial-gradient(circle at 10% 10%, rgba(201, 122, 61, 0.18), transparent 40%), radial-gradient(circle at 90% 90%, rgba(212, 165, 116, 0.14), transparent 42%), #0a0d12'
              : 'radial-gradient(circle at 12% 12%, rgba(182, 130, 81, 0.20), transparent 42%), radial-gradient(circle at 88% 88%, rgba(214, 188, 157, 0.26), transparent 44%), #f7f0e5',
        }}
      >
        <Paper
          elevation={0}
          sx={{
            overflow: 'hidden',
            borderRadius: 4,
          }}
        >
          <Box
            sx={{
              px: 3,
              py: 2.25,
              borderBottom: (theme) => `1px solid ${theme.palette.divider}`,
              background:
                paletteMode === 'dark'
                  ? 'linear-gradient(145deg, rgba(255,255,255,0.06), rgba(0,0,0,0.1))'
                  : 'linear-gradient(145deg, rgba(255,255,255,0.9), rgba(255,255,255,0.62))',
            }}
          >
            <Typography variant="h5" sx={{ fontWeight: 600, letterSpacing: '-0.02em' }}>
              Оборудование в эксплуатации
            </Typography>
            <Typography variant="body2" sx={{ mt: 0.5, opacity: 0.85 }}>
              Отображаются записи со статусом &apos;Active&apos;
              {typeof total === 'number' ? `: ${total}` : ''}
            </Typography>
          </Box>

          {isPending ? (
            <Box sx={{ display: 'flex', justifyContent: 'center', py: 8 }}>
              <CircularProgress />
            </Box>
          ) : error ? (
            <Box sx={{ p: 3 }}>
              <Alert severity="error">Не удалось загрузить активное оборудование.</Alert>
            </Box>
          ) : (
            <TableContainer>
              <Table size="small">
                <TableHead>
                  <TableRow>
                    <TableCell sx={{ fontWeight: 700 }}>Наименование</TableCell>
                    <TableCell sx={{ fontWeight: 700 }}>Заводской номер</TableCell>
                    <TableCell sx={{ fontWeight: 700 }}>Дата установки</TableCell>
                    <TableCell sx={{ fontWeight: 700 }}>Дата поверки</TableCell>
                  </TableRow>
                </TableHead>
                <TableBody>
                  {(data ?? []).map((item) => (
                    <TableRow key={item.id} hover>
                      <TableCell>{item.name}</TableCell>
                      <TableCell>{item.serialNumber}</TableCell>
                      <TableCell>{formatDate(item.installationDate)}</TableCell>
                      <TableCell>{formatDate(item.dateOfInspection)}</TableCell>
                    </TableRow>
                  ))}
                </TableBody>
              </Table>
            </TableContainer>
          )}
        </Paper>
      </Box>
    </ThemeProvider>
  );
}