import { Box, Heading, SimpleGrid, Image, Text, VStack, HStack, Button, Skeleton, Badge, useColorModeValue } from '@chakra-ui/react';
import { useQuery } from '@tanstack/react-query';
import { getArticles, Article } from '../../services/articles';
import { Link as RouterLink } from 'react-router-dom';
import { assetUrl } from '../../utils/url';
import InstagramGeneratorButton from '../admin/InstagramGeneratorButton';

const BlogCard: React.FC<{ article: Article }> = ({ article }) => {
  const link = article.slug ? `/news/${article.slug}` : `/articles/${article.id}`;
  const cardBg = useColorModeValue('white', 'gray.800');
  const border = useColorModeValue('gray.200', 'whiteAlpha.300');
  const categoryName = (article as any)?.category?.name || '';
  
  return (
    <VStack
      as={RouterLink}
      to={link}
      align="stretch"
      spacing={0}
      borderWidth="1px"
      borderRadius="xl"
      bg={cardBg}
      overflow="hidden"
      boxShadow="lg"
      borderColor={border}
      _hover={{ boxShadow: '2xl', transform: 'translateY(-4px)' }}
      transition="all 0.3s cubic-bezier(0.4, 0, 0.2, 1)"
      position="relative"
    >
      <Box position="relative" overflow="hidden">
        <Image 
          src={assetUrl(article.image_url) || '/logo192.png'} 
          alt={article.title} 
          objectFit="cover" 
          w="100%" 
          h="200px"
          transition="transform 0.3s ease"
          _groupHover={{ transform: 'scale(1.05)' }}
        />
        {categoryName && (
          <Badge 
            position="absolute" 
            top={3} 
            left={3} 
            colorScheme="blue"
            fontSize="xs"
            px={3}
            py={1}
            borderRadius="full"
            textTransform="uppercase"
            fontWeight="bold"
          >
            {categoryName}
          </Badge>
        )}
      </Box>
      <VStack align="stretch" spacing={3} p={5}>
        <Heading size="md" noOfLines={2} lineHeight="1.3">{article.title}</Heading>
        <Text noOfLines={3} color="gray.600" fontSize="sm" lineHeight="1.5">
          {article.content?.replace(/<[^>]*>/g, '').slice(0, 160)}
        </Text>
        <HStack spacing={2} pt={2} borderTopWidth="1px" borderColor={border}>
          {article.estimated_read_minutes && (
            <Text fontSize="xs" color="gray.500">
              {article.estimated_read_minutes} min čtení
            </Text>
          )}
          {article.published_at && (
            <Text fontSize="xs" color="gray.500">
              • {new Date(article.published_at).toLocaleDateString('cs-CZ')}
            </Text>
          )}
        </HStack>
      </VStack>
      <Box position="absolute" top={2} right={2} zIndex={2}>
        <InstagramGeneratorButton
          article={article as any}
          targetUrl={typeof window !== 'undefined' ? new URL(link, window.location.origin).toString() : undefined}
          placement="inline"
          size="sm"
        />
      </Box>
    </VStack>
  );
};

const BlogGrid: React.FC = () => {
  const { data, isLoading } = useQuery({
    queryKey: ['articles', { page: 1, page_size: 10, published: true }],
    queryFn: () => getArticles({ page: 1, page_size: 10, published: true }),
  });

  const articles = data?.data || [];

  return (
    <Box>
      <HStack justify="space-between" mb={4}>
        <Heading size="lg">Aktuality</Heading>
        <Button as={RouterLink} to="/blog" size="sm" variant="link">Zobrazit všechny</Button>
      </HStack>
      <SimpleGrid columns={{ base: 1, sm: 2, md: 3 }} spacing={6}>
        {isLoading && Array.from({ length: 6 }).map((_, i) => (
          <Skeleton key={i} height="240px" />
        ))}
        {!isLoading && articles.map((a) => (
          <BlogCard key={a.id} article={a} />
        ))}
      </SimpleGrid>
    </Box>
  );
};

export default BlogGrid;
