Mercados-Web/frontend/src/components/GranosWidget.tsx

import {
  Box, CircularProgress, Alert, Table, TableBody, TableCell,
  TableContainer, TableHead, TableRow, Paper, Typography, Tooltip
} from '@mui/material';
import type { CotizacionGrano } from '../models/mercadoModels';
import { useApiData } from '../hooks/useApiData';
import ArrowUpwardIcon from '@mui/icons-material/ArrowUpward';
import ArrowDownwardIcon from '@mui/icons-material/ArrowDownward';
import RemoveIcon from '@mui/icons-material/Remove';

const formatNumber = (num: number) => {
  return new Intl.NumberFormat('es-AR', {
    minimumFractionDigits: 2,
    maximumFractionDigits: 2,
  }).format(num);
};

const Variacion = ({ value }: { value: number }) => {
  const color = value > 0 ? 'success.main' : value < 0 ? 'error.main' : 'text.secondary';
  const Icon = value > 0 ? ArrowUpwardIcon : value < 0 ? ArrowDownwardIcon : RemoveIcon;

  return (
    <Box component="span" sx={{ display: 'flex', alignItems: 'center', justifyContent: 'center', color }}>
      <Icon sx={{ fontSize: '1rem', mr: 0.5 }} />
      <Typography variant="body2" component="span" sx={{ fontWeight: 'bold' }}>
        {formatNumber(value)}
      </Typography>
    </Box>
  );
};

export const GranosWidget = () => {
  const { data, loading, error } = useApiData<CotizacionGrano[]>('/mercados/granos');

  if (loading) {
    return <Box sx={{ display: 'flex', justifyContent: 'center', p: 4 }}><CircularProgress /></Box>;
  }

  if (error) {
    return <Alert severity="error">{error}</Alert>;
  }

  if (!data || data.length === 0) {
    return <Alert severity="info">No hay datos de granos disponibles en este momento.</Alert>;
  }

  return (
    <TableContainer component={Paper}>
      <Table size="small" aria-label="tabla granos">
        <TableHead>
          <TableRow>
            <TableCell>Grano</TableCell>
            <TableCell align="right">Precio ($/Tn)</TableCell>
            <TableCell align="center">Variación</TableCell>
            <TableCell align="right">Fecha Operación</TableCell>
          </TableRow>
        </TableHead>
        <TableBody>
          {data.map((row) => (
            <TableRow key={row.nombre} hover>
              <TableCell component="th" scope="row">
                <Typography variant="body2" sx={{ fontWeight: 'bold' }}>{row.nombre}</Typography>
              </TableCell>
              <TableCell align="right">${formatNumber(row.precio)}</TableCell>
              <TableCell align="center">
                <Variacion value={row.variacionPrecio} />
              </TableCell>
              <TableCell align="right">{new Date(row.fechaOperacion).toLocaleDateString('es-AR')}</TableCell>
            </TableRow>
          ))}
        </TableBody>
      </Table>
      <Tooltip title={`Última actualización: ${new Date(data[0].fechaRegistro).toLocaleString('es-AR')}`}>
        <Typography variant="caption" sx={{ p: 1, display: 'block', textAlign: 'right', color: 'text.secondary' }}>
          Fuente: Bolsa de Comercio de Rosario
        </Typography>
      </Tooltip>
    </TableContainer>
  );
};