// @flow
import type { Node } from 'react';
import { getImageProxyUrl, getThumbnailCdnUrl } from 'util/thumbnail';
import React from 'react';
import FreezeframeWrapper from './FreezeframeWrapper';
import Placeholder from './placeholder.png';
import { MISSING_THUMB_DEFAULT } from 'config';
import classnames from 'classnames';
import Thumb from './thumb';

type Props = {
  uri: string,
  thumbnail: ?string, // externally sourced image
  children?: Node,
  allowGifs: boolean,
  claim: ?StreamClaim,
  doResolveUri: (string) => void,
  className?: string,
};

function FileThumbnail(props: Props) {
  const { claim, uri, doResolveUri, thumbnail: rawThumbnail, children, allowGifs = false, className } = props;

  const passedThumbnail = rawThumbnail && rawThumbnail.trim().replace(/^http:\/\//i, 'https://');
  const thumbnailFromClaim =
    uri && claim && claim.value && claim.value.thumbnail ? claim.value.thumbnail.url : undefined;
  const thumbnail = passedThumbnail || thumbnailFromClaim;

  const hasResolvedClaim = claim !== undefined;
  const isGif = thumbnail && thumbnail.endsWith('gif');

  React.useEffect(() => {
    if (!hasResolvedClaim && uri && !passedThumbnail) {
      doResolveUri(uri);
    }
  }, [hasResolvedClaim, uri, doResolveUri, passedThumbnail]);

  if (!allowGifs && isGif) {
    const url = getImageProxyUrl(thumbnail);
    return (
      <FreezeframeWrapper src={url} className={classnames('media__thumb', className)}>
        {children}
      </FreezeframeWrapper>
    );
  }

  const fallback = MISSING_THUMB_DEFAULT ? getThumbnailCdnUrl({ thumbnail: MISSING_THUMB_DEFAULT }) : undefined;

  let url = thumbnail || (hasResolvedClaim ? Placeholder : '');
  // @if TARGET='web'
  // Pass image urls through a compression proxy
  if (thumbnail) {
    if (isGif) {
      url = getImageProxyUrl(thumbnail); // Note: the '!allowGifs' case is handled in Freezeframe above.
    } else {
      url = getThumbnailCdnUrl({ thumbnail });
    }
  }
  // @endif

  const thumbnailUrl = url ? url.replace(/'/g, "\\'") : '';

  if (hasResolvedClaim || thumbnailUrl) {
    return (
      <Thumb thumb={thumbnailUrl} fallback={fallback} className={className}>
        {children}
      </Thumb>
    );
  }
  return (
    <div
      className={classnames('media__thumb', className, {
        'media__thumb--resolving': !hasResolvedClaim,
      })}
    >
      {children}
    </div>
  );
}

export default FileThumbnail;