content: import React from 'react';
  import { connect } from 'react-redux';
  import ImmutablePureComponent from 'react-immutable-pure-component';
  import PropTypes from 'prop-types';
  import ImmutablePropTypes from 'react-immutable-proptypes';
  import { debounce } from 'lodash';
  import LoadingIndicator from '../../components/loading_indicator';
  import {
    fetchAccount,
    fetchFollowers,
    expandFollowers,
  } from '../../actions/accounts';
  import { FormattedMessage } from 'react-intl';
  import AccountContainer from '../../containers/account_container';
  import Column from '../ui/components/column';
  import HeaderContainer from '../account_timeline/containers/header_container';
  import ColumnBackButton from '../../components/column_back_button';
  import ScrollableList from '../../components/scrollable_list';
  import MissingIndicator from 'mastodon/components/missing_indicator';
  import TimelineHint from 'mastodon/components/timeline_hint';
  
  const mapStateToProps = (state, props) => ({
    remote: !!(state.getIn(['accounts', props.params.accountId, 'acct']) !== state.getIn(['accounts', props.params.accountId, 'username'])),
    remoteUrl: state.getIn(['accounts', props.params.accountId, 'url']),
    isAccount: !!state.getIn(['accounts', props.params.accountId]),
    accountIds: state.getIn(['user_lists', 'followers', props.params.accountId, 'items']),
    hasMore: !!state.getIn(['user_lists', 'followers', props.params.accountId, 'next']),
    isLoading: state.getIn(['user_lists', 'followers', props.params.accountId, 'isLoading'], true),
    blockedBy: state.getIn(['relationships', props.params.accountId, 'blocked_by'], false),
  });
  
  const RemoteHint = ({ url }) => (
    <TimelineHint url={url} resource={<FormattedMessage id='timeline_hint.resources.followers' defaultMessage='Followers' />} />
  );
  
  RemoteHint.propTypes = {
    url: PropTypes.string.isRequired,
  };
  
  export default @connect(mapStateToProps)
  class Followers extends ImmutablePureComponent {
  
    static propTypes = {
      params: PropTypes.object.isRequired,
      dispatch: PropTypes.func.isRequired,
      shouldUpdateScroll: PropTypes.func,
      accountIds: ImmutablePropTypes.list,
      hasMore: PropTypes.bool,
      isLoading: PropTypes.bool,
      blockedBy: PropTypes.bool,
      isAccount: PropTypes.bool,
      remote: PropTypes.bool,
      remoteUrl: PropTypes.string,
      multiColumn: PropTypes.bool,
    };
  
    componentWillMount () {
      if (!this.props.accountIds) {
        this.props.dispatch(fetchAccount(this.props.params.accountId));
        this.props.dispatch(fetchFollowers(this.props.params.accountId));
      }
    }
  
    componentWillReceiveProps (nextProps) {
      if (nextProps.params.accountId !== this.props.params.accountId && nextProps.params.accountId) {
        this.props.dispatch(fetchAccount(nextProps.params.accountId));
        this.props.dispatch(fetchFollowers(nextProps.params.accountId));
      }
    }
  
    handleLoadMore = debounce(() => {
      this.props.dispatch(expandFollowers(this.props.params.accountId));
    }, 300, { leading: true });
  
    render () {
      const { shouldUpdateScroll, accountIds, hasMore, blockedBy, isAccount, multiColumn, isLoading, remote, remoteUrl } = this.props;
  
      if (!isAccount) {
        return (
          <Column>
            <MissingIndicator />
          </Column>
        );
      }
  
      if (!accountIds) {
        return (
          <Column>
            <LoadingIndicator />
          </Column>
        );
      }
  
      let emptyMessage;
  
      if (blockedBy) {
        emptyMessage = <FormattedMessage id='empty_column.account_unavailable' defaultMessage='Profile unavailable' />;
      } else if (remote && accountIds.isEmpty()) {
        emptyMessage = <RemoteHint url={remoteUrl} />;
      } else {
        emptyMessage = <FormattedMessage id='account.followers.empty' defaultMessage='No one follows this user yet.' />;
      }
  
      const remoteMessage = remote ? <RemoteHint url={remoteUrl} /> : null;
  
      return (
        <Column>
          <ColumnBackButton multiColumn={multiColumn} />
  
          <ScrollableList
            scrollKey='followers'
            hasMore={hasMore}
            isLoading={isLoading}
            onLoadMore={this.handleLoadMore}
            shouldUpdateScroll={shouldUpdateScroll}
            prepend={<HeaderContainer accountId={this.props.params.accountId} hideTabs />}
            alwaysPrepend
            append={remoteMessage}
            emptyMessage={emptyMessage}
            bindToDocument={!multiColumn}
          >
            {blockedBy ? [] : accountIds.map(id =>
              <AccountContainer key={id} id={id} withNote={false} />,
            )}
          </ScrollableList>
        </Column>
      );
    }
  
  }
  