import { defineMessages, injectIntl, FormattedMessage } from 'react-intl'
import ImmutablePureComponent from 'react-immutable-pure-component'
import ImmutablePropTypes from 'react-immutable-proptypes'
import { debounce } from 'lodash'
import ColumnIndicator from '../components/column_indicator'
import AccountContainer from '../containers/account_container'
import { fetchBlocks, expandBlocks } from '../actions/blocks'
import ScrollableList from '../components/scrollable_list'

const messages = defineMessages({
  heading: { id: 'column.blocks', defaultMessage: 'Blocked users' },
});

const mapStateToProps = state => ({
  accountIds: state.getIn(['user_lists', 'blocks', 'items']),
  hasMore: !!state.getIn(['user_lists', 'blocks', 'next']),
});

export default
@connect(mapStateToProps)
@injectIntl
class Blocks extends ImmutablePureComponent {

  static propTypes = {
    params: PropTypes.object.isRequired,
    dispatch: PropTypes.func.isRequired,
    accountIds: ImmutablePropTypes.list,
    hasMore: PropTypes.bool,
    intl: PropTypes.object.isRequired,
  };

  componentWillMount () {
    this.props.dispatch(fetchBlocks());
  }

  handleLoadMore = debounce(() => {
    this.props.dispatch(expandBlocks());
  }, 300, { leading: true });

  render () {
    const { intl, accountIds, hasMore } = this.props;

    if (!accountIds) {
      return (<ColumnIndicator type='loading' />);
    }

    return (
      <ScrollableList
        scrollKey='blocks'
        onLoadMore={this.handleLoadMore}
        hasMore={hasMore}
        emptyMessage={<FormattedMessage id='empty_column.blocks' defaultMessage="You haven't blocked any users yet." />}
      >
        {accountIds.map(id =>
          <AccountContainer key={id} id={id} />
        )}
      </ScrollableList>
    );
  }

}