import { Heading, Text, Box, Spinner, Alert, AlertIcon, Table, Thead, Tbody, Tr, Th, Td, VStack, Select, HStack, Badge } from '@chakra-ui/react';
import { useQuery } from '@tanstack/react-query';
import { useMemo, useState } from 'react';
import AdminLayout from '../../layouts/AdminLayout';
import { assetUrl } from '../../utils/url';
import { TeamLogo } from '../../components/common/TeamLogo';
import { API_URL } from '../../services/api';

type TableRow = {
  rank?: string;
  team?: string;
  team_id?: string;
  team_logo_url?: string;
  played?: string;
  wins?: string;
  draws?: string;
  losses?: string;
  score?: string;
  points?: string;
};

const StandingsAdminPage: React.FC = () => {
  const { data, isLoading, error } = useQuery<any>({
    queryKey: ['facr-tables-cache'],
    queryFn: async () => {
      const origin = new URL(API_URL, typeof window !== 'undefined' ? window.location.origin : 'http://localhost:3000').origin;
      const url = `${origin}/cache/prefetch/facr_tables.json`;
      const res = await fetch(url, { headers: { 'Cache-Control': 'no-cache' } });
      if (!res.ok) throw new Error(`Failed to load cache: ${res.status}`);
      return res.json();
    },
    staleTime: 5 * 60 * 1000,
  });

  const competitions: any[] = Array.isArray(data?.competitions) ? data!.competitions : [];

  // Optional category/code switcher based on competition code
  const [code, setCode] = useState<string>('');
  const options = useMemo(() => {
    const items = competitions.map((c) => ({ code: c.code, name: c.name }));
    const unique = new Map(items.map((i) => [i.code, i]));
    return Array.from(unique.values());
  }, [competitions]);
  const filtered = code ? competitions.filter((c) => c.code === code) : competitions;

  return (
    <AdminLayout>
      <Heading size="lg" mb={2}>Standings (FAČR)</Heading>
      <Text mb={4}>Read-only view of standings from FACR cache. Fast and offline-friendly.</Text>

      {isLoading && (
        <VStack align="start" spacing={3} mb={6}>
          <Spinner />
          <Text>Načítám tabulky…</Text>
        </VStack>
      )}

      {Boolean(error) && (
        <Alert status="error" variant="left-accent" mb={4}>
          <AlertIcon />
          Nepodařilo se načíst data z cache.
        </Alert>
      )}

      {!isLoading && !error && (
        <HStack mb={4} spacing={3} align="center">
          <Text color="gray.600">Soutěž:</Text>
          <Select value={code} onChange={(e) => setCode(e.target.value)} maxW="260px" size="sm">
            <option value="">Vše</option>
            {options.map((o) => (
              <option key={o.code} value={o.code}>{o.code} — {o.name}</option>
            ))}
          </Select>
          <Badge colorScheme="gray" variant="subtle">{filtered.length} soutěží</Badge>
        </HStack>
      )}

      {!isLoading && !error && filtered.map((comp) => {
        const rows: TableRow[] = comp?.table?.overall || [];
        return (
          <Box key={comp.id} mb={8}>
            <Heading size="md" mb={3}>{comp.name}</Heading>
            <Box
              overflowX="auto"
              borderWidth="1px"
              borderRadius="md"
              w="full"
              maxW="100%"
              sx={{
                WebkitOverflowScrolling: 'touch',
                'th, td': { whiteSpace: 'nowrap' },
              }}
            >
              <Table size="sm" sx={{ width: 'max-content' }}>
                <Thead>
                  <Tr>
                    <Th>#</Th>
                    <Th>Tým</Th>
                    <Th isNumeric>Z</Th>
                    <Th isNumeric>V</Th>
                    <Th isNumeric>R</Th>
                    <Th isNumeric>P</Th>
                    <Th isNumeric>Skóre</Th>
                    <Th isNumeric>Body</Th>
                  </Tr>
                </Thead>
                <Tbody>
                  {rows.map((r, idx) => (
                    <Tr key={`${comp.id}-${idx}`}>
                      <Td width="40px">{r.rank}</Td>
                      <Td>
                        <HStack spacing={2} align="center">
                          <TeamLogo
                            teamId={r.team_id}
                            teamName={r.team}
                            facrLogo={r.team_logo_url}
                            size="small"
                            alt={r.team}
                            objectFit="contain"
                            fallbackIcon={
                              <Box
                                w="20px"
                                h="20px"
                                bg="gray.200"
                                borderRadius="md"
                                display="flex"
                                alignItems="center"
                                justifyContent="center"
                                color="gray.400"
                                fontSize="xs"
                                fontWeight="bold"
                              >
                                {r.team?.substring(0, 2).toUpperCase() || '??'}
                              </Box>
                            }
                          />
                          <Text as="span">{r.team}</Text>
                        </HStack>
                      </Td>
                      <Td isNumeric>{r.played}</Td>
                      <Td isNumeric>{r.wins}</Td>
                      <Td isNumeric>{r.draws}</Td>
                      <Td isNumeric>{r.losses}</Td>
                      <Td isNumeric>{r.score}</Td>
                      <Td isNumeric fontWeight="bold">{r.points}</Td>
                    </Tr>
                  ))}
                </Tbody>
              </Table>
            </Box>
          </Box>
        );
      })}
    </AdminLayout>
  );
};

export default StandingsAdminPage;
