hexbear-frontend/src/components/communities.tsx

/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
import React, { Component } from 'react';
import { Subscription } from 'rxjs';
import { retryWhen, delay, take } from 'rxjs/operators';
import {
  UserOperation,
  Community,
  ListCommunitiesResponse,
  CommunityResponse,
  FollowCommunityForm,
  SortType,
  WebSocketJsonResponse,
} from '../interfaces';
import { WebSocketService } from '../services';
import { wsJsonToRes, toast, getPageFromProps, siteName, api } from '../utils';
import { CommunityLink } from './community-link';
import { i18n } from '../i18next';
import { linkEvent } from '../linkEvent';
import { SpinnerSection } from './Spinner';
import Button from './elements/Button';
import { Heading } from 'theme-ui';
import Block from './elements/Block';
import { AxiosError } from 'axios';

const communityLimit = 100;

interface CommunitiesState {
  communities: Array<Community>;
  page: number;
  loading: boolean;
}

interface CommunitiesProps {
  page: number;
}

export class Communities extends Component<any, CommunitiesState> {
  private subscription: Subscription;
  private emptyState: CommunitiesState = {
    communities: [],
    loading: true,
    page: getPageFromProps(this.props),
  };

  constructor(props: any, context: any) {
    super(props, context);
    this.state = this.emptyState;
    document.title = `${i18n.t('communities')} - ${siteName}`;
    this.subscription = WebSocketService.Instance.subject
      .pipe(retryWhen(errors => errors.pipe(delay(3000), take(10))))
      .subscribe(
        msg => this.parseMessage(msg),
        err => console.error(err),
        () => console.log('complete')
      );

    this.fetchCommunityList();
  }

  componentWillUnmount(): void {
    this.subscription.unsubscribe();
  }

  static getDerivedStateFromProps(props: any): CommunitiesProps {
    return {
      page: getPageFromProps(props),
    };
  }

  componentDidUpdate(_: any, lastState: CommunitiesState): void {
    if (lastState.page !== this.state.page) {
      this.setState({ loading: true });
      this.fetchCommunityList();
    }
  }

  render(): JSX.Element {
    const { subscribed, notSubscribed } = this.state.communities.reduce(
      (result, community) => {
        if (community.subscribed) {
          result.subscribed.push(community);
        } else {
          result.notSubscribed.push(community);
        }
        return result;
      },
      {
        subscribed: [],
        notSubscribed: [],
      }
    );

    return (
      <div className="container">
        {this.state.loading ? (
          <SpinnerSection />
        ) : (
          <Block>
            <Heading as="h5" mb={4}>
              {i18n.t('list_of_communities')}
            </Heading>

            {[notSubscribed, subscribed].map((communities, index) => {
              return (
                <>
                  <Heading as="h3" my={2}>
                    {index === 0 ? 'Not Subscribed' : 'Subscribed'}
                  </Heading>
                  {communities.map(community => (
                    <Block
                      key={community.id}
                      display="flex"
                      flexDirection="column"
                      my={2}
                      maxWidth="600px"
                    >
                      <Block
                        display="flex"
                        justifyContent="space-between"
                        flexWrap="wrap"
                      >
                        <Block as="h4">
                          <CommunityLink community={community} />
                        </Block>
                        <Block mb={1}>
                          {community.subscribed ? (
                            <Button
                              onClick={linkEvent(
                                community.id,
                                this.handleUnsubscribe
                              )}
                            >
                              {i18n.t('unsubscribe')}
                            </Button>
                          ) : (
                            <Button
                              onClick={linkEvent(
                                community.id,
                                this.handleSubscribe
                              )}
                            >
                              {i18n.t('subscribe')}
                            </Button>
                          )}
                        </Block>
                      </Block>
                      <Block as="h5" display="inline" mb={1}>
                        {community.title}
                      </Block>
                      <Block display="flex" justifyContent="space-between">
                        <Block>{community.category_name}</Block>
                        <Block>
                          {community.number_of_subscribers}{' '}
                          {i18n.t('subscribers')}
                        </Block>
                      </Block>
                      <Block display="flex" justifyContent="space-between">
                        <Block>
                          {community.number_of_posts} {i18n.t('posts')}
                        </Block>
                        <Block>
                          {community.number_of_comments} {i18n.t('comments')}
                        </Block>
                      </Block>
                    </Block>
                  ))}
                </>
              );
            })}
            {this.paginator()}
          </Block>
        )}
      </div>
    );
  }

  paginator(): JSX.Element {
    return (
      <div className="mt-2">
        {this.state.page > 1 && (
          <Button
            className="btn btn-sm btn-secondary mr-1"
            onClick={linkEvent(this, this.prevPage)}
          >
            {i18n.t('prev')}
          </Button>
        )}

        {this.state.communities.length > 0 && (
          <Button
            className="btn btn-sm btn-secondary"
            onClick={linkEvent(this, this.nextPage)}
          >
            {i18n.t('next')}
          </Button>
        )}
      </div>
    );
  }

  updateUrl(paramUpdates: CommunitiesProps): void {
    const page = paramUpdates.page || this.state.page;
    this.props.history.push(`/communities/page/${page}`);
  }

  nextPage(i: Communities): void {
    i.updateUrl({ page: i.state.page + 1 });
  }

  prevPage(i: Communities): void {
    i.updateUrl({ page: i.state.page - 1 });
  }

  handleUnsubscribe(communityId: number): void {
    let form: FollowCommunityForm = {
      community_id: communityId,
      follow: false,
    };
    WebSocketService.Instance.followCommunity(form);
  }

  handleSubscribe(communityId: number): void {
    let form: FollowCommunityForm = {
      community_id: communityId,
      follow: true,
    };
    WebSocketService.Instance.followCommunity(form);
  }

  async fetchCommunityList(): Promise<void> {
    const params = new URLSearchParams({
      sort: SortType[SortType.New],
      limit: communityLimit,
      page: this.state.page,
    } as any);

    api
      .get<ListCommunitiesResponse>(`community/list?${params.toString()}`)
      .then(res => {
        const data = res.data;
        this.setState(
          {
            communities: data.communities.sort(
              (a, b) => b.number_of_subscribers - a.number_of_subscribers
            ),
            loading: false,
          },
          () => {
            window.scrollTo(0, 0);
            // XXX: Sort this table?
            let table = document.querySelector('#community_table');
            return table;
          }
        );
      })
      .catch((err: Error | AxiosError) => {
        const res = (err as AxiosError).response;
        if (res) {
          const data = res.data as { error: string };
          toast(i18n.t(data.error), 'danger');
        } else {
          console.log(err);
        }
      });
  }

  parseMessage(msg: WebSocketJsonResponse) {
    let res = wsJsonToRes(msg);
    if (msg.error) {
      toast(i18n.t(msg.error), 'danger');
      return;
    } else if (res.op == UserOperation.FollowCommunity) {
      let data = res.data as CommunityResponse;
      let found = this.state.communities.find(c => c.id == data.community.id);
      found.subscribed = data.community.subscribed;
      found.number_of_subscribers = data.community.number_of_subscribers;
      this.setState(this.state);
    }
  }
}