content: import React from 'react';
  import { connect } from 'react-redux';
  import ImmutablePropTypes from 'react-immutable-proptypes';
  import PropTypes from 'prop-types';
  import {
    fetchAccount,
    fetchAccountMediaTimeline,
    expandAccountMediaTimeline,
  } from '../../actions/accounts';
  import LoadingIndicator from '../../components/loading_indicator';
  import Column from '../ui/components/column';
  import ColumnBackButton from '../../components/column_back_button';
  import Immutable from 'immutable';
  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 { FormattedMessage } from 'react-intl';
  import { ScrollContainer } from 'react-router-scroll';
  import LoadMore from '../../components/load_more';
  
  const mapStateToProps = (state, props) => ({
    medias: getAccountGallery(state, Number(props.params.accountId)),
    isLoading: state.getIn(['timelines', 'accounts_media_timelines', Number(props.params.accountId), 'isLoading']),
    hasMore: !!state.getIn(['timelines', 'accounts_media_timelines', Number(props.params.accountId), 'next']),
    autoPlayGif: state.getIn(['meta', 'auto_play_gif']),
  });
  
  class AccountGallery extends ImmutablePureComponent {
  
    static propTypes = {
      params: PropTypes.object.isRequired,
      dispatch: PropTypes.func.isRequired,
      medias: ImmutablePropTypes.list.isRequired,
      isLoading: PropTypes.bool,
      hasMore: PropTypes.bool,
      autoPlayGif: PropTypes.bool,
    };
  
    componentDidMount () {
      this.props.dispatch(fetchAccount(Number(this.props.params.accountId)));
      this.props.dispatch(fetchAccountMediaTimeline(Number(this.props.params.accountId)));
    }
  
    componentWillReceiveProps (nextProps) {
      if (nextProps.params.accountId !== this.props.params.accountId && nextProps.params.accountId) {
        this.props.dispatch(fetchAccount(Number(nextProps.params.accountId)));
        this.props.dispatch(fetchAccountMediaTimeline(Number(this.props.params.accountId)));
      }
    }
  
    handleScrollToBottom = () => {
      if (this.props.hasMore) {
        this.props.dispatch(expandAccountMediaTimeline(Number(this.props.params.accountId)));
      }
    }
  
    handleScroll = (e) => {
      const { scrollTop, scrollHeight, clientHeight } = e.target;
      const offset = scrollHeight - scrollTop - clientHeight;
  
      if (150 > offset && !this.props.isLoading) {
        this.handleScrollToBottom();
      }
    }
  
    handleLoadMore = (e) => {
      e.preventDefault();
      this.handleScrollToBottom();
    }
  
    render () {
      const { medias, autoPlayGif, isLoading, hasMore } = this.props;
  
      let loadMore = null;
  
      if (!medias && isLoading) {
        return (
          <Column>
            <LoadingIndicator />
          </Column>
        );
      }
  
      if (!isLoading && medias.size > 0 && hasMore) {
        loadMore = <LoadMore onClick={this.handleLoadMore} />;
      }
  
      return (
        <Column>
          <ColumnBackButton />
  
          <ScrollContainer scrollKey='account_gallery'>
            <div className='scrollable' onScroll={this.handleScroll}>
              <HeaderContainer accountId={this.props.params.accountId} />
  
              <div className='account-section-headline'>
                <FormattedMessage id='account.media' defaultMessage='Media' />
              </div>
  
              <div className='account-gallery__container'>
                {medias.map(media =>
                  <MediaItem
                    key={media.get('id')}
                    media={media}
                    autoPlayGif={autoPlayGif}
                  />
                )}
                {loadMore}
              </div>
            </div>
          </ScrollContainer>
        </Column>
      );
    }
  
  }
  
  export default connect(mapStateToProps)(AccountGallery);
  