import type { GridProps } from '@chakra-ui/react';
import { Box, Grid, Flex, Text, Link, VStack, Skeleton } from '@chakra-ui/react';
import { useQuery } from '@tanstack/react-query';
import React from 'react';

import type { CustomLinksGroup } from 'types/footerLinks';

import config from 'configs/app';
import type { ResourceError } from 'lib/api/resources';
import useApiQuery from 'lib/api/useApiQuery';
import useFetch from 'lib/hooks/useFetch';
import useIssueUrl from 'lib/hooks/useIssueUrl';
import NetworkAddToWallet from 'ui/shared/NetworkAddToWallet';

import FooterLinkItem from './FooterLinkItem';
import IntTxsIndexingStatus from './IntTxsIndexingStatus';
import getApiVersionUrl from './utils/getApiVersionUrl';

const MAX_LINKS_COLUMNS = 4;

const FRONT_VERSION_URL = `https://github.com/blockscout/frontend/tree/${config.UI.footer.frontendVersion}`;
const FRONT_COMMIT_URL = `https://github.com/blockscout/frontend/commit/${config.UI.footer.frontendCommit}`;

const Footer = () => {

  const { data: backendVersionData } = useApiQuery('config_backend_version', {
    queryOptions: {
      staleTime: Infinity,
    },
  });
  const apiVersionUrl = getApiVersionUrl(backendVersionData?.backend_version);
  const issueUrl = useIssueUrl(backendVersionData?.backend_version);
  const BLOCKSCOUT_LINKS = [
    {
      icon: 'edit' as const,
      iconSize: '16px',
      text: 'Submit an issue',
      url: issueUrl,
    },
    {
      icon: 'social/canny' as const,
      iconSize: '20px',
      text: 'Feature request',
      url: 'https://blockscout.canny.io/feature-requests',
    },
    {
      icon: 'social/git' as const,
      iconSize: '18px',
      text: 'Contribute',
      url: 'https://github.com/blockscout/blockscout',
    },
    {
      icon: 'social/twitter' as const,
      iconSize: '18px',
      text: 'X (ex-Twitter)',
      url: 'https://www.twitter.com/blockscoutcom',
    },
    {
      icon: 'social/discord' as const,
      iconSize: '24px',
      text: 'Discord',
      url: 'https://discord.gg/blockscout',
    },
    {
      icon: 'discussions' as const,
      iconSize: '20px',
      text: 'Discussions',
      url: 'https://github.com/orgs/blockscout/discussions',
    },
    {
      icon: 'donate' as const,
      iconSize: '20px',
      text: 'Donate',
      url: 'https://github.com/sponsors/blockscout',
    },
  ];

  const frontendLink = (() => {
    if (config.UI.footer.frontendVersion) {
      return <Link href={FRONT_VERSION_URL} target="_blank">{config.UI.footer.frontendVersion}</Link>;
    }

    if (config.UI.footer.frontendCommit) {
      return <Link href={FRONT_COMMIT_URL} target="_blank">{config.UI.footer.frontendCommit}</Link>;
    }

    return null;
  })();

  const fetch = useFetch();

  const { isPlaceholderData, data: linksData } = useQuery<unknown, ResourceError<unknown>, Array<CustomLinksGroup>>({
    queryKey: ['footer-links'],
    queryFn: async () => fetch(config.UI.footer.links || '', undefined, { resource: 'footer-links' }),
    enabled: Boolean(config.UI.footer.links),
    staleTime: Infinity,
    placeholderData: [],
  });

  const colNum = isPlaceholderData ? 1 : Math.min(linksData?.length || Infinity, MAX_LINKS_COLUMNS) + 1;

  const renderNetworkInfo = React.useCallback((gridArea?: GridProps['gridArea']) => {
    return (
      <Flex
        gridArea={gridArea}
        flexWrap="wrap"
        columnGap={8}
        rowGap={6}
        mb={{ base: 5, lg: 10 }}
        _empty={{ display: 'none' }}
      >
        {!config.UI.indexingAlert.intTxs.isHidden && <IntTxsIndexingStatus />}
        <NetworkAddToWallet />
      </Flex>
    );
  }, []);

  const renderProjectInfo = React.useCallback((gridArea?: GridProps['gridArea']) => {
    return (
      <Box gridArea={gridArea}>
        <Link fontSize="xs" href="https://www.blockscout.com">blockscout.com</Link>
        <Text mt={3} fontSize="xs">
          Blockscout is a tool for inspecting and analyzing EVM based blockchains. Blockchain explorer for Ethereum Networks.
        </Text>
        <VStack spacing={1} mt={6} alignItems="start">
          {apiVersionUrl && (
            <Text fontSize="xs">
              Backend: <Link href={apiVersionUrl} target="_blank">{backendVersionData?.backend_version}</Link>
            </Text>
          )}
          {frontendLink && (
            <Text fontSize="xs">
              Frontend: {frontendLink}
            </Text>
          )}
        </VStack>
      </Box>
    );
  }, [apiVersionUrl, backendVersionData?.backend_version, frontendLink]);

  const containerProps: GridProps = {
    as: 'footer',
    px: { base: 4, lg: 12 },
    py: { base: 4, lg: 9 },
    borderTop: '1px solid',
    borderColor: 'divider',
    gridTemplateColumns: { base: '1fr', lg: 'minmax(auto, 470px) 1fr' },
    columnGap: { lg: '32px', xl: '100px' },
  };

  if (config.UI.footer.links) {
    return (
      <Grid {...containerProps}>
        <div>
          {renderNetworkInfo()}
          {renderProjectInfo()}
        </div>

        <Grid
          gap={{ base: 6, lg: colNum === MAX_LINKS_COLUMNS + 1 ? 2 : 8, xl: 12 }}
          gridTemplateColumns={{
            base: 'repeat(auto-fill, 160px)',
            lg: `repeat(${colNum}, 135px)`,
            xl: `repeat(${colNum}, 160px)`,
          }}
          justifyContent={{ lg: 'flex-end' }}
          mt={{ base: 8, lg: 0 }}
        >
          {
            ([
              { title: 'Blockscout', links: BLOCKSCOUT_LINKS },
              ...(linksData || []),
            ])
              .slice(0, colNum)
              .map(linkGroup => (
                <Box key={linkGroup.title}>
                  <Skeleton fontWeight={500} mb={3} display="inline-block" isLoaded={!isPlaceholderData}>{linkGroup.title}</Skeleton>
                  <VStack spacing={1} alignItems="start">
                    {linkGroup.links.map(link => <FooterLinkItem {...link} key={link.text} isLoading={isPlaceholderData} />)}
                  </VStack>
                </Box>
              ))
          }
        </Grid>
      </Grid>
    );
  }

  return (
    <Grid
      {...containerProps}
      gridTemplateAreas={{
        lg: `
          "network links-top"
          "info links-bottom"
        `,
      }}
    >
      <Text fontSize="xs">
        © AGICoin Foundation
      </Text>


      {/* { renderNetworkInfo({ lg: 'network' }) }
      { renderProjectInfo({ lg: 'info' }) }

      <Grid
        gridArea={{ lg: 'links-bottom' }}
        gap={ 1 }
        gridTemplateColumns={{
          base: 'repeat(auto-fill, 160px)',
          lg: 'repeat(3, 160px)',
          xl: 'repeat(4, 160px)',
        }}
        gridTemplateRows={{
          base: 'auto',
          lg: 'repeat(3, auto)',
          xl: 'repeat(2, auto)',
        }}
        gridAutoFlow={{ base: 'row', lg: 'column' }}
        alignContent="start"
        justifyContent={{ lg: 'flex-end' }}
        mt={{ base: 8, lg: 0 }}
      >
        { BLOCKSCOUT_LINKS.map(link => <FooterLinkItem { ...link } key={ link.text }/>) }
      </Grid> */}
    </Grid>
  );
};

export default React.memo(Footer);
