import React, { useState, useEffect, useRef } from 'react';
import { FormattedMessage } from 'react-intl';

import { Stack, HStack, Card, Avatar, Text, Icon } from 'soapbox/components/ui';
import IconButton from 'soapbox/components/ui/icon-button/icon-button';
import StatusCard from 'soapbox/features/status/components/card';
import { useAppSelector } from 'soapbox/hooks';

import type { Card as CardEntity } from 'soapbox/types/entities';

interface IAd {
  /** Embedded ad data in Card format (almost like OEmbed). */
  card: CardEntity,
  /** Impression URL to fetch upon display. */
  impression?: string,
}

/** Displays an ad in sponsored post format. */
const Ad: React.FC<IAd> = ({ card, impression }) => {
  const instance = useAppSelector(state => state.instance);

  const infobox = useRef<HTMLDivElement>(null);
  const [showInfo, setShowInfo] = useState(false);

  /** Toggle the info box on click. */
  const handleInfoButtonClick: React.MouseEventHandler = () => {
    setShowInfo(!showInfo);
  };

  /** Hide the info box when clicked outside. */
  const handleClickOutside = (event: MouseEvent) => {
    if (event.target && infobox.current && !infobox.current.contains(event.target as any)) {
      setShowInfo(false);
    }
  };

  // Hide the info box when clicked outside.
  // https://stackoverflow.com/a/42234988
  useEffect(() => {
    document.addEventListener('mousedown', handleClickOutside);
    return () => {
      document.removeEventListener('mousedown', handleClickOutside);
    };
  }, [infobox]);

  // Fetch the impression URL (if any) upon displaying the ad.
  // It's common for ad providers to provide this.
  useEffect(() => {
    if (impression) {
      fetch(impression);
    }
  }, [impression]);

  return (
    <div className='relative'>
      <Card className='p-5' variant='rounded'>
        <Stack space={4}>
          <HStack alignItems='center' space={3}>
            <Avatar src={instance.thumbnail} size={42} />

            <Stack grow>
              <HStack space={1}>
                <Text size='sm' weight='semibold' truncate>
                  {instance.title}
                </Text>

                <Icon
                  className='w-5 h-5 stroke-accent-500'
                  src={require('@tabler/icons/timeline.svg')}
                />
              </HStack>

              <Stack>
                <HStack alignItems='center' space={1}>
                  <Text theme='muted' size='sm' truncate>
                    <FormattedMessage id='sponsored.subtitle' defaultMessage='Sponsored post' />
                  </Text>
                </HStack>
              </Stack>
            </Stack>

            <Stack justifyContent='center'>
              <IconButton
                iconClassName='stroke-gray-600 w-6 h-6'
                src={require('@tabler/icons/info-circle.svg')}
                onClick={handleInfoButtonClick}
              />
            </Stack>
          </HStack>

          <StatusCard card={card} onOpenMedia={() => {}} horizontal />
        </Stack>
      </Card>

      {showInfo && (
        <div ref={infobox} className='absolute top-5 right-5 max-w-[234px]'>
          <Card variant='rounded'>
            <Stack space={2}>
              <Text size='sm' weight='bold'>
                <FormattedMessage id='sponsored.info.title' defaultMessage='Why am I seeing this ad?' />
              </Text>

              <Text size='sm' theme='muted'>
                <FormattedMessage
                  id='sponsored.info.message'
                  defaultMessage='{siteTitle} displays ads to help fund our service.'
                  values={{ siteTitle: instance.title }}
                />
              </Text>
            </Stack>
          </Card>
        </div>
      )}
    </div>
  );
};

export default Ad;