import React, { useState, useEffect } from 'react';
import { useParams, useNavigate } from 'react-router-dom';
import axios from 'axios';
import { Event, Rsvp } from '../types';
import { 
  Button, 
  Container, 
  Typography, 
  Box, 
  Paper, 
  List, 
  ListItem, 
  ListItemText, 
  CircularProgress, 
  Alert,
  Chip
} from '@mui/material';

const EventDetails: React.FC = () => {
  const { slug } = useParams<{ slug: string }>();
  const navigate = useNavigate();
  const [event, setEvent] = useState<Event | null>(null);
  const [rsvps, setRsvps] = useState<Rsvp[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    const fetchEventDetails = async () => {
      try {
        const [eventResponse, rsvpsResponse] = await Promise.all([
          axios.get<Event>(`/api/events/${slug}`),
          axios.get<Rsvp[]>(`/api/events/${slug}/rsvps`)
        ]);
        setEvent(eventResponse.data);
        setRsvps(rsvpsResponse.data);
        setLoading(false);
      } catch (error) {
        setError('Failed to load event details');
        setLoading(false);
      }
    };

    fetchEventDetails();
  }, [slug]);

  const formatAttendingStatus = (attending: string) => {
    return attending.charAt(0).toUpperCase() + attending.slice(1);
  };

  const getStatusColor = (attending: string): "success" | "error" | "warning" => {
    switch (attending.toLowerCase()) {
      case 'yes':
        return 'success';
      case 'no':
        return 'error';
      default:
        return 'warning';
    }
  };

  if (loading) {
    return (
      <Box
        sx={{
          minHeight: '100vh',
          display: 'flex',
          justifyContent: 'center',
          alignItems: 'center',
          backgroundImage: 'url(https://www.rydertech.us/backgrounds/space1.jpg)',
          backgroundSize: 'cover',
          backgroundPosition: 'center',
        }}
      >
        <CircularProgress />
      </Box>
    );
  }

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

  if (!event) {
    return (
      <Container maxWidth="md">
        <Alert severity="warning">Event not found</Alert>
      </Container>
    );
  }

  return (
    <Container maxWidth="md">
      <Paper sx={{ p: 4, mb: 4 }}>
        <Typography variant="h4" component="h1" gutterBottom>
          {event.title}
        </Typography>
        <Typography variant="body1" paragraph>
          {event.description}
        </Typography>
        <Box sx={{ mb: 3 }}>
          <Typography variant="subtitle1" component="div" gutterBottom>
            <strong>Date:</strong> {new Date(event.date).toLocaleDateString()}
          </Typography>
          <Typography variant="subtitle1" component="div">
            <strong>Location:</strong> {event.location}
          </Typography>
          {event.needed_items && event.needed_items.length > 0 && (
            <Box sx={{ mt: 2 }}>
              <Typography variant="subtitle1" component="div" gutterBottom>
                <strong>Needed Items:</strong>
              </Typography>
              <Box sx={{ display: 'flex', flexWrap: 'wrap', gap: 1 }}>
                {event.needed_items.map((item, index) => (
                  <Chip key={index} label={item} color="primary" />
                ))}
              </Box>
            </Box>
          )}
        </Box>
        <Button
          variant="contained"
          color="primary"
          onClick={() => navigate(`/events/${event.slug}/rsvp`)}
        >
          RSVP to Event
        </Button>
      </Paper>

      <Paper sx={{ p: 4 }}>
        <Typography 
          variant="h5" 
          gutterBottom 
          sx={{ 
            fontWeight: 500,
            color: 'primary.main',
            mb: 2,
            borderBottom: '2px solid',
            borderColor: 'primary.main',
            pb: 1
          }}
        >
          RSVPs
        </Typography>
        <List sx={{ 
          bgcolor: 'rgba(255, 255, 255, 0.1)',
          borderRadius: 1,
          boxShadow: '0 2px 4px rgba(0,0,0,0.05)'
        }}>
          {rsvps.map((rsvp) => (
            <ListItem 
              key={rsvp.id}
              sx={{
                borderBottom: '1px solid',
                borderColor: 'divider',
                '&:last-child': {
                  borderBottom: 'none'
                }
              }}
            >
              <ListItemText
                primary={
                  <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
                    <Typography variant="subtitle1" sx={{ fontWeight: 500 }}>
                      {rsvp.name}
                    </Typography>
                    <Chip 
                      label={formatAttendingStatus(rsvp.attending)}
                      color={getStatusColor(rsvp.attending)}
                      size="small"
                    />
                  </Box>
                }
                secondary={
                  <Box sx={{ mt: 1 }}>
                    {rsvp.bringing_guests === 'yes' && (
                      <Typography variant="body2" color="text.secondary" paragraph>
                        Bringing {rsvp.guest_count} guest{rsvp.guest_count !== 1 ? 's' : ''}: {rsvp.guest_names}
                      </Typography>
                    )}
                    {rsvp.items_bringing && rsvp.items_bringing.length > 0 && (
                      <Typography>
                        <strong>Items:</strong> {Array.isArray(rsvp.items_bringing) ? rsvp.items_bringing.join(', ') : rsvp.items_bringing}
                      </Typography>
                    )}
                  </Box>
                }
              />
            </ListItem>
          ))}
          {rsvps.length === 0 && (
            <ListItem>
              <ListItemText
                primary={
                  <Typography variant="body1" color="text.secondary" align="center">
                    No RSVPs yet
                  </Typography>
                }
              />
            </ListItem>
          )}
        </List>
      </Paper>
    </Container>
  );
};

export default EventDetails;