content: import React from 'react';
  import { connect } from 'react-redux';
  import ImmutablePropTypes from 'react-immutable-proptypes';
  import PropTypes from 'prop-types';
  import { fetchAccount } from '../../actions/accounts';
  import { expandAccountMediaTimeline } from '../../actions/timelines';
  import LoadingIndicator from '../../components/loading_indicator';
  import Column from '../ui/components/column';
  import ColumnBackButton from '../../components/column_back_button';
  import ImmutablePureComponent from 'react-immutable-pure-component';
  import { getAccountGallery } from '../../selectors';
  import MediaItem from './components/media_item';
  import HeaderContainer from '../account_timeline/containers/header_container';
  import { ScrollContainer } from 'react-router-scroll-4';
  import LoadMore from '../../components/load_more';
  
  const mapStateToProps = (state, props) => ({
    medias: getAccountGallery(state, props.params.accountId),
    isLoading: state.getIn(['timelines', `account:${props.params.accountId}:media`, 'isLoading']),
    hasMore:   state.getIn(['timelines', `account:${props.params.accountId}:media`, 'hasMore']),
  });
  
  class LoadMoreMedia extends ImmutablePureComponent {
  
    static propTypes = {
      shouldUpdateScroll: PropTypes.func,
      maxId: PropTypes.string,
      onLoadMore: PropTypes.func.isRequired,
    };
  
    handleLoadMore = () => {
      this.props.onLoadMore(this.props.maxId);
    }
  
    render () {
      return (
        <LoadMore
          disabled={this.props.disabled}
          onClick={this.handleLoadMore}
        />
      );
    }
  
  }
  
  export default @connect(mapStateToProps)
  class AccountGallery extends ImmutablePureComponent {
  
    static propTypes = {
      params: PropTypes.object.isRequired,
      dispatch: PropTypes.func.isRequired,
      medias: ImmutablePropTypes.list.isRequired,
      isLoading: PropTypes.bool,
      hasMore: PropTypes.bool,
    };
  
    componentDidMount () {
      this.props.dispatch(fetchAccount(this.props.params.accountId));
      this.props.dispatch(expandAccountMediaTimeline(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(expandAccountMediaTimeline(this.props.params.accountId));
      }
    }
  
    handleScrollToBottom = () => {
      if (this.props.hasMore) {
        this.handleLoadMore(this.props.medias.size > 0 ? this.props.medias.last().getIn(['status', 'id']) : undefined);
      }
    }
  
    handleScroll = (e) => {
      const { scrollTop, scrollHeight, clientHeight } = e.target;
      const offset = scrollHeight - scrollTop - clientHeight;
  
      if (150 > offset && !this.props.isLoading) {
        this.handleScrollToBottom();
      }
    }
  
    handleLoadMore = maxId => {
      this.props.dispatch(expandAccountMediaTimeline(this.props.params.accountId, { maxId }));
    };
  
    handleLoadOlder = (e) => {
      e.preventDefault();
      this.handleScrollToBottom();
    }
  
    render () {
      const { medias, shouldUpdateScroll, isLoading, hasMore } = this.props;
  
      let loadOlder = null;
  
      if (!medias && isLoading) {
        return (
          <Column>
            <LoadingIndicator />
          </Column>
        );
      }
  
      if (hasMore && !(isLoading && medias.size === 0)) {
        loadOlder = <LoadMore visible={!isLoading} onClick={this.handleLoadOlder} />;
      }
  
      return (
        <Column>
          <ColumnBackButton />
  
          <ScrollContainer scrollKey='account_gallery' shouldUpdateScroll={shouldUpdateScroll}>
            <div className='scrollable scrollable--flex' onScroll={this.handleScroll}>
              <HeaderContainer accountId={this.props.params.accountId} />
  
              <div role='feed' className='account-gallery__container'>
                {medias.map((media, index) => media === null ? (
                  <LoadMoreMedia
                    key={'more:' + medias.getIn(index + 1, 'id')}
                    maxId={index > 0 ? medias.getIn(index - 1, 'id') : null}
                    onLoadMore={this.handleLoadMore}
                  />
                ) : (
                  <MediaItem
                    key={media.get('id')}
                    media={media}
                  />
                ))}
                {loadOlder}
              </div>
  
              {isLoading && medias.size === 0 && (
                <div className='scrollable__append'>
                  <LoadingIndicator />
                </div>
              )}
            </div>
          </ScrollContainer>
        </Column>
      );
    }
  
  }
  