import { Box, Grid, GridItem, Heading, Image, Button, HStack, Text, VStack, Badge } from '@chakra-ui/react';
import React, { useEffect, useState } from 'react';
import { Link as RouterLink } from 'react-router-dom';
import { Calendar, Image as ImageIcon } from 'lucide-react';

interface Album {
  id: string;
  title: string;
  url: string;
  date: string;
  photos_count: number;
  views_count?: number;
  photos: Array<{
    id: string;
    page_url: string;
    image_1500: string;
  }>;
}

// Resolve backend-relative URLs against API origin
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 b = new URL(base);
      const abs = new URL(path, `${b.protocol}//${b.host}`);
      return abs.toString();
    }
    return path;
  } catch { return path; }
};

const PhotosSection: React.FC<{ zoneramaUrl?: string | null }> = ({ zoneramaUrl }) => {
  const [albums, setAlbums] = useState<Album[]>([]);
  const [loaded, setLoaded] = useState(false);

  useEffect(() => {
    let active = true;
    (async () => {
      try {
        const apiUrl = process.env.REACT_APP_API_URL || 'http://localhost:8080/api/v1';
        const response = await fetch(`${apiUrl}/gallery/albums`);
        
        if (response.ok) {
          const data = await response.json();
          if (active) {
            // Get 5 most recent albums
            setAlbums((data.albums || []).slice(0, 5));
          }
        }
      } catch {
        if (active) setAlbums([]);
      } finally {
        if (active) setLoaded(true);
      }
    })();
    return () => { active = false };
  }, []);

  const showSetupHint = loaded && albums.length === 0 && !zoneramaUrl;

  return (
    <Box>
      <HStack justify="space-between" mb={3}>
        <Heading size="lg">Fotogalerie</Heading>
        <Button as={RouterLink} to="/galerie" size="sm" variant="outline">
          Zobrazit vše
        </Button>
      </HStack>

      {showSetupHint && (
        <Box bg="yellow.50" borderWidth="1px" borderColor="yellow.200" color="yellow.800" p={3} borderRadius="md" mb={3}>
          <Text>Žádné fotky nejsou k dispozici. Zadejte prosím odkaz na Zonerama v nastavení (Sociální sítě → Fotogalerie) a my ji budeme automaticky načítat.</Text>
        </Box>
      )}

      {/* Zonerama Attribution */}
      {albums.length > 0 && (
        <Box bg="blue.50" borderWidth="1px" borderColor="blue.200" color="blue.800" p={2} borderRadius="md" mb={3} fontSize="xs">
          <Text>
            📸 Fotografie z{' '}
            <Text
              as="a"
              href="https://zonerama.com"
              target="_blank"
              rel="noopener noreferrer"
              fontWeight="600"
              color="blue.600"
              _hover={{ textDecoration: 'underline' }}
            >
              Zonerama
            </Text>
          </Text>
        </Box>
      )}

      <Grid templateColumns={{ base: '1fr', md: 'repeat(2, 1fr)', lg: 'repeat(3, 1fr)' }} gap={4}>
        {albums.map((album) => {
          const coverPhoto = album.photos && album.photos.length > 0 ? album.photos[0] : null;
          
          return (
            <GridItem key={album.id}>
              <Box
                as={RouterLink}
                to={`/galerie/album/${album.id}`}
                bg="white"
                borderRadius="md"
                overflow="hidden"
                boxShadow="sm"
                transition="all 0.2s"
                _hover={{
                  transform: 'translateY(-2px)',
                  boxShadow: 'md',
                }}
                cursor="pointer"
                display="block"
              >
                {/* Cover Image */}
                {coverPhoto ? (
                  <Image
                    src={resolveBackendUrl(coverPhoto.image_1500)}
                    alt={album.title}
                    h="180px"
                    w="100%"
                    objectFit="cover"
                  />
                ) : (
                  <Box
                    h="180px"
                    w="100%"
                    bg="gray.200"
                    display="flex"
                    alignItems="center"
                    justifyContent="center"
                  >
                    <ImageIcon size={32} color="gray" />
                  </Box>
                )}
                
                {/* Album Info */}
                <VStack align="stretch" p={3} spacing={2}>
                  <Heading size="sm" noOfLines={2} color="gray.800">
                    {album.title}
                  </Heading>
                  <HStack spacing={3} fontSize="xs" color="gray.600">
                    {album.date && (
                      <HStack spacing={1}>
                        <Calendar size={14} />
                        <Text>{album.date}</Text>
                      </HStack>
                    )}
                    <HStack spacing={1}>
                      <ImageIcon size={14} />
                      <Text>{album.photos_count} foto</Text>
                    </HStack>
                  </HStack>
                </VStack>
              </Box>
            </GridItem>
          );
        })}
      </Grid>
    </Box>
  );
};

export default PhotosSection;
