import React, { useEffect, useMemo, useState } from 'react';
import MainLayout from '../components/layout/MainLayout';
import { Box, Breadcrumb, BreadcrumbItem, BreadcrumbLink, Button, Container, Flex, Heading, Image, Link, Spinner, Stack, Text, useToast } from '@chakra-ui/react';
import { Link as RouterLink, useParams } from 'react-router-dom';
import { usePublicSettings } from '../hooks/usePublicSettings';
import { useQuery } from '@tanstack/react-query';
import { getCompetitionAliasesPublic } from '../services/competitionAliases';
import SponsorsSection from '../components/common/SponsorsSection';
import NewsletterCTA from '../components/common/NewsletterCTA';

interface MatchItem {
  id: string | number;
  date: string;
  time: string;
  home: string;
  away: string;
  venue?: string;
  home_logo_url?: string;
  away_logo_url?: string;
  report_url?: string;
  facr_link?: string;
  score?: string;
}

const resolveBackendUrl = (path: string) => {
  try {
    if (/^https?:\/\//i.test(path)) return path;
    if (path.startsWith('/cache') || path.startsWith('/uploads') || path.startsWith('/api/')) {
      const base = process.env.REACT_APP_API_BASE_URL || process.env.REACT_APP_API_URL || 'http://localhost:8080/api/v1';
      const u = new URL(base);
      u.pathname = path; // use backend origin root
      return u.toString();
    }
    return path;
  } catch {
    return path;
  }
};

const MatchDetailPage: React.FC = () => {
  const { id } = useParams<{ id: string }>();
  const toast = useToast();
  const { data: settings } = usePublicSettings();
  const [loading, setLoading] = useState(true);
  const [match, setMatch] = useState<MatchItem | null>(null);
  const [competitionName, setCompetitionName] = useState<string>("");
  const [competitionId, setCompetitionId] = useState<string>("");
  const [competitionCode, setCompetitionCode] = useState<string>("");
  const [prevMatch, setPrevMatch] = useState<MatchItem | null>(null);
  const [nextMatch, setNextMatch] = useState<MatchItem | null>(null);

  useEffect(() => {
    let cancelled = false;
    (async () => {
      if (!id) return;
      setLoading(true);
      try {
        // Try main prefetch file first
        const res = await fetch(resolveBackendUrl('/cache/prefetch/facr_club_info.json'), { cache: 'no-cache' });
        let found: MatchItem | null = null;
        let neighborSource: MatchItem[] = [];
        if (res.ok) {
          const json = await res.json();
          for (const c of (json?.competitions || [])) {
            const listForNeighbors: MatchItem[] = [];
            for (const m of (c?.matches || [])) {
              const mid = String(m.match_id || '');
              if (mid && mid === String(id)) {
                const dt: string = String(m.date_time || '');
                const [d, t] = dt.includes(' ') ? dt.split(' ') : [dt, ''];
                const [day, month, year] = d.split('.');
                const isoDate = (day && month && year) ? `${year}-${month.padStart(2,'0')}-${day.padStart(2,'0')}` : new Date().toISOString().slice(0,10);
                const time = (t || '00:00').slice(0,5);
                const score = (m.score || m.result || (typeof m.goals_home === 'number' && typeof m.goals_away === 'number' ? `${m.goals_home}:${m.goals_away}` : '') || '').toString();
                found = {
                  id: mid,
                  date: isoDate,
                  time,
                  home: m.home,
                  away: m.away,
                  venue: m.venue,
                  home_logo_url: m.home_logo_url,
                  away_logo_url: m.away_logo_url,
                  report_url: m.report_url,
                  facr_link: m.facr_link,
                  score: score && /\d+\s*:\s*\d+/.test(score) ? score.replace(/\s+/g,'') : undefined,
                };
                setCompetitionName(String(c?.name || c?.code || ''));
                if (c?.id != null) setCompetitionId(String(c.id));
                if (c?.code) setCompetitionCode(String(c.code));
                break;
              }
              // also push into neighbor list when iterating
              const dt2: string = String(m.date_time || '');
              const [d2, t2] = dt2.includes(' ') ? dt2.split(' ') : [dt2, ''];
              const [day2, month2, year2] = d2.split('.');
              const iso2 = (day2 && month2 && year2) ? `${year2}-${month2.padStart(2,'0')}-${day2.padStart(2,'0')}` : new Date().toISOString().slice(0,10);
              const tshort = (t2 || '00:00').slice(0,5);
              listForNeighbors.push({ id: m.match_id || '', date: iso2, time: tshort, home: m.home, away: m.away } as MatchItem);
            }
            if (found) break;
            neighborSource = listForNeighbors;
          }
        }
        // Fallback to club-specific info file
        if (!found && settings?.club_id) {
          const clubType = settings.club_type || 'football';
          const infoPath = `/cache/facr/${clubType}_${settings.club_id}_info.json`;
          const res2 = await fetch(resolveBackendUrl(infoPath), { cache: 'no-cache' });
          if (res2.ok) {
            const j2 = await res2.json();
            for (const c of (j2?.competitions || [])) {
              const listForNeighbors: MatchItem[] = [];
              for (const m of (c?.matches || [])) {
                const mid = String(m.match_id || '');
                if (mid && mid === String(id)) {
                  const dt: string = String(m.date_time || '');
                  const [d, t] = dt.includes(' ') ? dt.split(' ') : [dt, ''];
                  const [day, month, year] = d.split('.');
                  const isoDate = (day && month && year) ? `${year}-${month.padStart(2,'0')}-${day.padStart(2,'0')}` : new Date().toISOString().slice(0,10);
                  const time = (t || '00:00').slice(0,5);
                  const score = (m.score || m.result || (typeof m.goals_home === 'number' && typeof m.goals_away === 'number' ? `${m.goals_home}:${m.goals_away}` : '') || '').toString();
                  found = {
                    id: mid,
                    date: isoDate,
                    time,
                    home: m.home,
                    away: m.away,
                    venue: m.venue,
                    home_logo_url: m.home_logo_url,
                    away_logo_url: m.away_logo_url,
                    report_url: m.report_url,
                    facr_link: m.facr_link,
                    score: score && /\d+\s*:\s*\d+/.test(score) ? score.replace(/\s+/g,'') : undefined,
                  };
                  setCompetitionName(String(c?.name || c?.code || ''));
                  if (c?.id != null) setCompetitionId(String(c.id));
                  if (c?.code) setCompetitionCode(String(c.code));
                  break;
                }
                // collect neighbor list
                const dt2: string = String(m.date_time || '');
                const [d2, t2] = dt2.includes(' ') ? dt2.split(' ') : [dt2, ''];
                const [day2, month2, year2] = d2.split('.');
                const iso2 = (day2 && month2 && year2) ? `${year2}-${month2.padStart(2,'0')}-${day2.padStart(2,'0')}` : new Date().toISOString().slice(0,10);
                const tshort = (t2 || '00:00').slice(0,5);
                listForNeighbors.push({ id: m.match_id || '', date: iso2, time: tshort, home: m.home, away: m.away } as MatchItem);
              }
              if (found) break;
              neighborSource = listForNeighbors;
            }
          }
        }
        // compute neighbors
        if (found && neighborSource.length) {
          const sorted = neighborSource.sort((a, b) => new Date(`${a.date}T${a.time}:00`).getTime() - new Date(`${b.date}T${b.time}:00`).getTime());
          const idx = sorted.findIndex(x => String(x.id) === String(found!.id));
          setPrevMatch(idx > 0 ? sorted[idx - 1] : null);
          setNextMatch(idx >= 0 && idx < sorted.length - 1 ? sorted[idx + 1] : null);
        } else {
          setPrevMatch(null); setNextMatch(null);
        }
        if (!cancelled) setMatch(found);
      } catch (e: any) {
        if (!cancelled) toast({ title: 'Chyba', description: e?.message || 'Nelze načíst zápas', status: 'error' });
      } finally {
        if (!cancelled) setLoading(false);
      }
    })();
    return () => { cancelled = true; };
  }, [id, settings, toast]);

  const isPast = useMemo(() => {
    if (!match) return false;
    return new Date(`${match.date}T${(match.time||'00:00')}:00`).getTime() < Date.now();
  }, [match]);

  // Load aliases and resolve display name for competition
  const { data: aliases } = useQuery({
    queryKey: ['public-competition-aliases'],
    queryFn: getCompetitionAliasesPublic,
  });
  const compDisplay = useMemo(() => {
    if (!competitionCode) return competitionName;
    const hit = (aliases || []).find(a => a.code === competitionCode);
    return hit?.alias || competitionName;
  }, [aliases, competitionCode, competitionName]);

  return (
    <MainLayout>
      <Container maxW="3xl" py={{ base: 6, md: 10 }}>
        <Breadcrumb fontSize="sm" mb={4} separator="/">
          <BreadcrumbItem>
            <BreadcrumbLink as={RouterLink} to="/">Domů</BreadcrumbLink>
          </BreadcrumbItem>
          <BreadcrumbItem>
            <BreadcrumbLink as={RouterLink} to={competitionId ? `/kalendar?comp=${competitionId}` : "/kalendar"}>Kalendář</BreadcrumbLink>
          </BreadcrumbItem>
          {compDisplay && (
            <BreadcrumbItem>
              <BreadcrumbLink as={RouterLink} to={competitionId ? `/kalendar?comp=${competitionId}` : "/kalendar"}>{compDisplay}</BreadcrumbLink>
            </BreadcrumbItem>
          )}
          {match && (
            <BreadcrumbItem isCurrentPage>
              <BreadcrumbLink>{match.home} vs {match.away}</BreadcrumbLink>
            </BreadcrumbItem>
          )}
        </Breadcrumb>
        <Box mb={4}>
          <Button as={RouterLink} to={competitionId ? `/kalendar?comp=${competitionId}` : "/kalendar"} size="sm" variant="outline">Zpět na kalendář</Button>
        </Box>
        {loading && (
          <Flex align="center" gap={3} color="gray.600"><Spinner size="sm" /> Načítám…</Flex>
        )}
        {!loading && !match && (
          <Box color="gray.600">Zápas nebyl nalezen.</Box>
        )}
        {match && (
          <Stack spacing={5}>
            <Heading size="lg">{match.home} vs {match.away}</Heading>
            <Flex align="center" justify="center" gap={4}>
              {match.home_logo_url && (
                <Image src={match.home_logo_url} alt={match.home} boxSize="56px" borderRadius="full" />
              )}
              <Text fontSize="2xl" fontWeight="bold">{isPast && match.score ? match.score : 'vs'}</Text>
              {match.away_logo_url && (
                <Image src={match.away_logo_url} alt={match.away} boxSize="56px" borderRadius="full" />
              )}
            </Flex>
            <Text textAlign="center" color="gray.700">{match.date} {match.time} {match.venue ? `• ${match.venue}` : ''}</Text>
            {(prevMatch || nextMatch) && (
              <Flex justify="space-between" mt={2}>
                <Box>
                  {prevMatch && (
                    <Button as={RouterLink} to={`/zapas/${prevMatch.id}`} size="sm" variant="ghost">← {prevMatch.home} vs {prevMatch.away}</Button>
                  )}
                </Box>
                <Box>
                  {nextMatch && (
                    <Button as={RouterLink} to={`/zapas/${nextMatch.id}`} size="sm" variant="ghost">{nextMatch.home} vs {nextMatch.away} →</Button>
                  )}
                </Box>
              </Flex>
            )}
            {(match.facr_link || match.report_url) && (
              <Flex justify="center" gap={3}>
                {match.facr_link && (
                  <Button 
                    colorScheme="red" 
                    variant="outline"
                    onClick={(e) => {
                      e.preventDefault();
                      // Open in background tab without switching focus
                      const link = document.createElement('a');
                      link.href = match.facr_link || '';
                      link.target = '_blank';
                      link.rel = 'noopener noreferrer';
                      link.style.display = 'none';
                      document.body.appendChild(link);
                      link.click();
                      document.body.removeChild(link);
                    }}
                  >
                    FAČR detail
                  </Button>
                )}
                {match.report_url && (
                  <Button 
                    variant="outline"
                    onClick={(e) => {
                      e.preventDefault();
                      // Open in background tab without switching focus
                      const link = document.createElement('a');
                      link.href = match.report_url || '';
                      link.target = '_blank';
                      link.rel = 'noopener noreferrer';
                      link.style.display = 'none';
                      document.body.appendChild(link);
                      link.click();
                      document.body.removeChild(link);
                    }}
                  >
                    Zápis
                  </Button>
                )}
              </Flex>
            )}
          </Stack>
        )}
      </Container>
      
      {/* Newsletter CTA */}
      <NewsletterCTA />
      
      {/* Sponsors Section */}
      <SponsorsSection />
    </MainLayout>
  );
};

export default MatchDetailPage;
