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 {
	fetchMembers,
	expandMembers,
} from '../../../actions/groups';
import { FormattedMessage } from 'react-intl';
import AccountContainer from '../../../containers/account_container';
import Column from '../../ui/components/column';
import ScrollableList from '../../../components/scrollable_list';

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

export default @connect(mapStateToProps)
class GroupMembers extends ImmutablePureComponent {

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

	componentWillMount () {
		const { params: { id } } = this.props;

		this.props.dispatch(fetchMembers(id));
	}

	componentWillReceiveProps (nextProps) {
		if (nextProps.params.id !== this.props.params.id) {
			this.props.dispatch(fetchMembers(nextProps.params.id));
		}
	}

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

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

		if (!group || !accountIds) {
			return (
				<Column>
					<LoadingIndicator />
				</Column>
			);
		}

		return (
			<Column>
				<ScrollableList
					scrollKey='members'
					hasMore={hasMore}
					onLoadMore={this.handleLoadMore}
					emptyMessage={<FormattedMessage id='group.members.empty' defaultMessage='This group does not has any members.' />}
				>
					{accountIds.map(id => <AccountContainer key={id} id={id} withNote={false} />)}
				</ScrollableList>
			</Column>
		);
	}
}