import React, { useState, useRef } from 'react';
import {
  Box, CircularProgress, Alert, Table, TableBody, TableCell, TableContainer,
  TableHead, TableRow, Paper, Typography, Dialog, DialogTitle,
  DialogContent, IconButton
} from '@mui/material';
import CloseIcon from '@mui/icons-material/Close';
import ArrowUpwardIcon from '@mui/icons-material/ArrowUpward';
import ArrowDownwardIcon from '@mui/icons-material/ArrowDownward';
import RemoveIcon from '@mui/icons-material/Remove';
import { PiChartLineUpBold } from 'react-icons/pi';

// Importaciones de nuestro proyecto
import type { CotizacionBolsa } from '../models/mercadoModels';
import { useApiData } from '../hooks/useApiData';
import { useIsHoliday } from '../hooks/useIsHoliday';
import { formatFullDateTime, formatCurrency } from '../utils/formatters';
import { HistoricalChartWidget } from './HistoricalChartWidget';
import { HolidayAlert } from './common/HolidayAlert';

/**
 * Sub-componente para mostrar la variación porcentual con un icono y color apropiado.
 */
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' }}>{value.toFixed(2)}%</Typography>
    </Box>
  );
};

/**
 * Widget autónomo para la tabla de acciones líderes locales (Panel Merval).
 */
export const BolsaLocalWidget = () => {
  // Este widget obtiene todos los datos del mercado local y luego los filtra.
  const { data, loading: dataLoading, error: dataError } = useApiData<CotizacionBolsa[]>('/mercados/bolsa/local');
  const isHoliday = useIsHoliday('BA');
  
  const [selectedTicker, setSelectedTicker] = useState<string | null>(null);
  const triggerButtonRef = useRef<HTMLButtonElement | null>(null);

  const handleOpenModal = (ticker: string, event: React.MouseEvent<HTMLButtonElement>) => {
    triggerButtonRef.current = event.currentTarget;
    setSelectedTicker(ticker);
  };
  
  const handleCloseDialog = () => {
    setSelectedTicker(null);
    setTimeout(() => {
      triggerButtonRef.current?.focus();
    }, 0);
  };
  
  // Filtramos para obtener solo las acciones, excluyendo el índice.
  const panelPrincipal = data?.filter(d => d.ticker !== '^MERV') || [];

  const isLoading = dataLoading || isHoliday === null;

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

  if (dataError) {
    return <Alert severity="error">{dataError}</Alert>;
  }
  
  // Si después de filtrar no queda ninguna acción, mostramos el mensaje apropiado.
  if (panelPrincipal.length === 0) {
      // Si sabemos que es feriado, la alerta de feriado es el mensaje más relevante.
      if (isHoliday) {
          return <HolidayAlert />;
      }
      return <Alert severity="info">No hay acciones líderes disponibles para mostrar.</Alert>;
  }

  return (
    <Box>
      {/* La alerta de feriado también se aplica a esta tabla. */}
      {isHoliday && (
        <Box sx={{ mb: 2 }}>
          <HolidayAlert />
        </Box>
      )}

      <TableContainer component={Paper}>
        <Box sx={{ p: 1, m: 0 }}>
          <Typography variant="caption" sx={{ fontStyle: 'italic', color: 'text.secondary' }}>
            Última actualización de acciones: {formatFullDateTime(panelPrincipal[0].fechaRegistro)}
          </Typography>
        </Box>
        <Table size="small" aria-label="panel principal merval">
          <TableHead>
            <TableRow>
              <TableCell>Símbolo</TableCell>
              <TableCell align="right">Precio Actual</TableCell>
              <TableCell align="right" sx={{ display: { xs: 'none', md: 'table-cell' } }}>Apertura</TableCell>
              <TableCell align="right" sx={{ display: { xs: 'none', sm: 'table-cell' } }}>Cierre Anterior</TableCell>
              <TableCell align="center">% Cambio</TableCell>
              <TableCell align="center">Historial</TableCell>
            </TableRow>
          </TableHead>
          <TableBody>
            {panelPrincipal.map((row) => (
              <TableRow key={row.ticker} hover>
                <TableCell component="th" scope="row"><Typography variant="body2" sx={{ fontWeight: 'bold' }}>{row.ticker}</Typography></TableCell>
                <TableCell align="right">${formatCurrency(row.precioActual)}</TableCell>
                <TableCell align="right" sx={{ display: { xs: 'none', md: 'table-cell' } }}>${formatCurrency(row.apertura)}</TableCell>
                <TableCell align="right" sx={{ display: { xs: 'none', sm: 'table-cell' } }}>${formatCurrency(row.cierreAnterior)}</TableCell>
                <TableCell align="center"><Variacion value={row.porcentajeCambio} /></TableCell>
                <TableCell align="center">
                  <IconButton
                    aria-label={`ver historial de ${row.ticker}`}
                    size="small"
                    onClick={(event) => handleOpenModal(row.ticker, event)}
                    sx={{
                      boxShadow: '0 1px 3px rgba(0,0,0,0.1)',
                      transition: 'all 0.2s ease-in-out',
                      '&:hover': { transform: 'scale(1.1)', boxShadow: '0 2px 6px rgba(0,0,0,0.2)' }
                    }}
                  >
                    <PiChartLineUpBold size="18" />
                  </IconButton>
                </TableCell>
              </TableRow>
            ))}
          </TableBody>
        </Table>
      </TableContainer>

      <Dialog
        open={Boolean(selectedTicker)}
        onClose={handleCloseDialog}
        maxWidth="md"
        fullWidth
        sx={{ '& .MuiDialog-paper': { overflow: 'visible' } }}
      >
        <IconButton
          aria-label="close"
          onClick={handleCloseDialog}
          sx={{
            position: 'absolute', top: -15, right: -15,
            color: (theme) => theme.palette.grey[500],
            backgroundColor: 'white', boxShadow: 3,
            '&:hover': { backgroundColor: 'grey.100' },
          }}
        >
          <CloseIcon />
        </IconButton>
        <DialogTitle sx={{ m: 0, p: 2 }}>
          Historial de 30 días para: {selectedTicker}
        </DialogTitle>
        <DialogContent dividers>
          {selectedTicker && <HistoricalChartWidget ticker={selectedTicker} mercado="Local" dias={30} />}
        </DialogContent>
      </Dialog>
    </Box>
  );
};