import React from 'react';
import {gql} from 'react-apollo';
import {connect} from 'react-redux';
import Comment from 'coral-admin/src/routes/Moderation/containers/Comment';
import {getDefinitionName} from 'coral-framework/utils';
import truncate from 'lodash/truncate';
import t from 'coral-framework/services/i18n';

function prepareNotificationText(text) {
  return truncate(text, {length: 50}).replace('\n', ' ');
}

class ModSubscription extends React.Component {
  subscriptions = null;

  componentWillMount() {
    const configs = [
      {
        document: COMMENT_FEATURED_SUBSCRIPTION,
        variables: {
          assetId: this.props.data.variables.asset_id,
        },
        updateQuery: (prev, {subscriptionData: {data: {commentFeatured: {user, comment}}}}) => {
          const notifyText = this.props.user.id === user.id
            ? ''
            : t(
              'talk-plugin-featured-comments.notify_featured',
              user.username,
              prepareNotificationText(comment.body),
            );
          return this.props.handleCommentChange(prev, comment, notifyText);
        },
      },
      {
        document: COMMENT_UNFEATURED_SUBSCRIPTION,
        variables: {
          assetId: this.props.data.variables.asset_id,
        },
        updateQuery: (prev, {subscriptionData: {data: {commentUnfeatured: {user, comment}}}}) => {
          const notify = this.props.user.id === user.id
            ? ''
            : t(
              'talk-plugin-featured-comments.notify_unfeatured',
              user.username,
              prepareNotificationText(comment.body),
            );
          return this.props.handleCommentChange(prev, comment, notify);
        }
      },
    ];
    this.subscriptions = configs.map((config) => this.props.data.subscribeToMore(config));
  }

  componentWillUnmount() {
    this.subscriptions.forEach((unsubscribe) => unsubscribe());
  }

  render() {
    return null;
  }
}

const COMMENT_FEATURED_SUBSCRIPTION = gql`
  subscription CommentFeatured($assetId: ID){
    commentFeatured(asset_id: $assetId) {
      comment {
        ...${getDefinitionName(Comment.fragments.comment)}
      }
      user {
        id
        username
      }
    }
  }
  ${Comment.fragments.comment}
`;

const COMMENT_UNFEATURED_SUBSCRIPTION = gql`
  subscription CommentUnfeatured($assetId: ID){
    commentUnfeatured(asset_id: $assetId){
      comment {
        ...${getDefinitionName(Comment.fragments.comment)}
      }
      user {
        id
        username
      }
    }
  }
  ${Comment.fragments.comment}
`;

const mapStateToProps = (state) => ({
  user: state.auth.user,
});

export default connect(mapStateToProps, null)(ModSubscription);