// @flow
import * as ICONS from 'constants/icons';
import * as PAGES from 'constants/pages';
import * as CS from 'constants/claim_search';
import React, { useRef } from 'react';
import Page from 'component/page';
import ClaimListDiscover from 'component/claimListDiscover';
import Button from 'component/button';
import useHover from 'effects/use-hover';
import { useIsMobile } from 'effects/use-screensize';
import analytics from 'analytics';
import HiddenNsfw from 'component/common/hidden-nsfw';
import Icon from 'component/common/icon';
import LbcSymbol from 'component/common/lbc-symbol';
import I18nMessage from 'component/i18nMessage';

const LIMIT_CLAIMS_PER_CHANNEL = 3;

type Props = {
  location: { search: string },
  followedTags: Array<Tag>,
  repostedUri: string,
  repostedClaim: ?GenericClaim,
  doToggleTagFollowDesktop: (string) => void,
  doResolveUri: (string) => void,
  isAuthenticated: boolean,
  dynamicRouteProps: RowDataItem,
  tileLayout: boolean,
};

function DiscoverPage(props: Props) {
  const {
    location: { search },
    followedTags,
    repostedClaim,
    repostedUri,
    doToggleTagFollowDesktop,
    doResolveUri,
    tileLayout,
    dynamicRouteProps,
  } = props;
  const buttonRef = useRef();
  const isHovering = useHover(buttonRef);
  const isMobile = useIsMobile();

  const urlParams = new URLSearchParams(search);
  const claimType = urlParams.get('claim_type');
  const tagsQuery = urlParams.get('t') || null;
  const tags = tagsQuery ? tagsQuery.split(',') : null;
  const repostedClaimIsResolved = repostedUri && repostedClaim;

  const discoverIcon = ICONS.DISCOVER;
  const discoverLabel = __('All Content');
  // Eventually allow more than one tag on this page
  // Restricting to one to make follow/unfollow simpler
  const tag = (tags && tags[0]) || null;
  const channelIds =
    (dynamicRouteProps && dynamicRouteProps.options && dynamicRouteProps.options.channelIds) || undefined;

  const isFollowing = followedTags.map(({ name }) => name).includes(tag);
  let label = isFollowing ? __('Following --[button label indicating a channel has been followed]--') : __('Follow');
  if (isHovering && isFollowing) {
    label = __('Unfollow');
  }

  function getElemMeta() {
    return !dynamicRouteProps ? (
      <a className="help" href="https://lbry.com/faq/trending" title={__('Learn more about LBRY Credits')}>
        <I18nMessage
          tokens={{
            lbc: <LbcSymbol />,
          }}
        >
          Results boosted by %lbc%
        </I18nMessage>
      </a>
    ) : (
      tag && !isMobile && (
        <Button
          ref={buttonRef}
          button="alt"
          icon={ICONS.SUBSCRIBE}
          iconColor="red"
          onClick={handleFollowClick}
          requiresAuth={IS_WEB}
          label={label}
        />
      )
    );
  }

  React.useEffect(() => {
    if (repostedUri && !repostedClaimIsResolved) {
      doResolveUri(repostedUri);
    }
  }, [repostedUri, repostedClaimIsResolved, doResolveUri]);

  function handleFollowClick() {
    if (tag) {
      doToggleTagFollowDesktop(tag);

      const nowFollowing = !isFollowing;
      analytics.tagFollowEvent(tag, nowFollowing, 'tag-page');
    }
  }

  let headerLabel;
  if (repostedClaim) {
    headerLabel = __('Reposts of %uri%', { uri: repostedUri });
  } else if (tag) {
    headerLabel = (
      <span>
        <Icon icon={ICONS.TAG} size={10} />
        {(tag === CS.TAGS_ALL && __('All Content')) || (tag === CS.TAGS_FOLLOWED && __('Followed Tags')) || tag}

        <Button
          className="claim-search__tags-link"
          button="link"
          label={__('Manage Tags')}
          navigate={`/$/${PAGES.TAGS_FOLLOWING_MANAGE}`}
        />
      </span>
    );
  } else {
    headerLabel = (
      <span>
        <Icon icon={(dynamicRouteProps && dynamicRouteProps.icon) || discoverIcon} size={10} />
        {(dynamicRouteProps && dynamicRouteProps.title) || discoverLabel}
      </span>
    );
  }

  // GET ELEM DATA??
  return (
    <Page noFooter fullWidthPage={tileLayout}>
      <ClaimListDiscover
        tileLayout={repostedUri ? false : tileLayout}
        claimType={claimType ? [claimType] : undefined}
        headerLabel={headerLabel}
        tags={tags}
        hiddenNsfwMessage={<HiddenNsfw type="page" />}
        repostedClaimId={repostedClaim ? repostedClaim.claim_id : null}
        // Assume wild west page if no dynamicRouteProps
        // Not a very good solution, but just doing it for now
        // until we are sure this page will stay around
        // TODO: find a better way to determine discover / wild west vs other modes release times
        // for now including && !tags so that
        channelIds={channelIds}
        limitClaimsPerChannel={LIMIT_CLAIMS_PER_CHANNEL}
        meta={getElemMeta()}
        hasSource
      />
    </Page>
  );
}

export default DiscoverPage;
