lemmy/ui/src/components/main.tsx

import { Component, linkEvent } from 'inferno';
import { Link } from 'inferno-router';
import { Subscription } from 'rxjs';
import { retryWhen, delay, take } from 'rxjs/operators';
import {
  UserOperation,
  CommunityUser,
  GetFollowedCommunitiesResponse,
  ListCommunitiesForm,
  ListCommunitiesResponse,
  Community,
  SortType,
  GetSiteResponse,
  ListingType,
  DataType,
  SiteResponse,
  GetPostsResponse,
  PostResponse,
  Post,
  GetPostsForm,
  Comment,
  GetCommentsForm,
  GetCommentsResponse,
  CommentResponse,
  AddAdminResponse,
  BanUserResponse,
  WebSocketJsonResponse,
} from '../interfaces';
import { WebSocketService, UserService } from '../services';
import { PostListings } from './post-listings';
import { CommentNodes } from './comment-nodes';
import { SortSelect } from './sort-select';
import { ListingTypeSelect } from './listing-type-select';
import { DataTypeSelect } from './data-type-select';
import { SiteForm } from './site-form';
import { UserListing } from './user-listing';
import {
  wsJsonToRes,
  repoUrl,
  mdToHtml,
  fetchLimit,
  toast,
  getListingTypeFromProps,
  getPageFromProps,
  getSortTypeFromProps,
  getDataTypeFromProps,
  editCommentRes,
  saveCommentRes,
  createCommentLikeRes,
  createPostLikeFindRes,
  editPostFindRes,
  commentsToFlatNodes,
  setupTippy,
} from '../utils';
import { i18n } from '../i18next';
import { T } from 'inferno-i18next';

interface MainState {
  subscribedCommunities: Array<CommunityUser>;
  trendingCommunities: Array<Community>;
  siteRes: GetSiteResponse;
  showEditSite: boolean;
  loading: boolean;
  posts: Array<Post>;
  comments: Array<Comment>;
  listingType: ListingType;
  dataType: DataType;
  sort: SortType;
  page: number;
}

export class Main extends Component<any, MainState> {
  private subscription: Subscription;
  private emptyState: MainState = {
    subscribedCommunities: [],
    trendingCommunities: [],
    siteRes: {
      site: {
        id: null,
        name: null,
        creator_id: null,
        creator_name: null,
        published: null,
        number_of_users: null,
        number_of_posts: null,
        number_of_comments: null,
        number_of_communities: null,
        enable_downvotes: null,
        open_registration: null,
        enable_nsfw: null,
      },
      admins: [],
      banned: [],
      online: null,
    },
    showEditSite: false,
    loading: true,
    posts: [],
    comments: [],
    listingType: getListingTypeFromProps(this.props),
    dataType: getDataTypeFromProps(this.props),
    sort: getSortTypeFromProps(this.props),
    page: getPageFromProps(this.props),
  };

  constructor(props: any, context: any) {
    super(props, context);

    this.state = this.emptyState;
    this.handleEditCancel = this.handleEditCancel.bind(this);
    this.handleSortChange = this.handleSortChange.bind(this);
    this.handleListingTypeChange = this.handleListingTypeChange.bind(this);
    this.handleDataTypeChange = this.handleDataTypeChange.bind(this);

    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')
      );

    WebSocketService.Instance.getSite();

    if (UserService.Instance.user) {
      WebSocketService.Instance.getFollowedCommunities();
    }

    let listCommunitiesForm: ListCommunitiesForm = {
      sort: SortType[SortType.Hot],
      limit: 6,
    };

    WebSocketService.Instance.listCommunities(listCommunitiesForm);

    this.fetchData();
  }

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

  // Necessary for back button for some reason
  componentWillReceiveProps(nextProps: any) {
    if (
      nextProps.history.action == 'POP' ||
      nextProps.history.action == 'PUSH'
    ) {
      this.state.listingType = getListingTypeFromProps(nextProps);
      this.state.dataType = getDataTypeFromProps(nextProps);
      this.state.sort = getSortTypeFromProps(nextProps);
      this.state.page = getPageFromProps(nextProps);
      this.setState(this.state);
      this.fetchData();
    }
  }

  render() {
    return (
      <div class="container">
        <div class="row">
          <main role="main" class="col-12 col-md-8">
            {this.posts()}
          </main>
          <aside class="col-12 col-md-4">{this.my_sidebar()}</aside>
        </div>
      </div>
    );
  }

  my_sidebar() {
    return (
      <div>
        {!this.state.loading && (
          <div>
            <div class="card border-secondary mb-3">
              <div class="card-body">
                {this.trendingCommunities()}
                {UserService.Instance.user &&
                  this.state.subscribedCommunities.length > 0 && (
                    <div>
                      <h5>
                        <T i18nKey="subscribed_to_communities">
                          #
                          <Link class="text-body" to="/communities">
                            #
                          </Link>
                        </T>
                      </h5>
                      <ul class="list-inline">
                        {this.state.subscribedCommunities.map(community => (
                          <li class="list-inline-item">
                            <Link to={`/c/${community.community_name}`}>
                              {community.community_name}
                            </Link>
                          </li>
                        ))}
                      </ul>
                    </div>
                  )}
                <Link
                  class="btn btn-sm btn-secondary btn-block"
                  to="/create_community"
                >
                  {i18n.t('create_a_community')}
                </Link>
              </div>
            </div>
            {this.sidebar()}
            {this.landing()}
          </div>
        )}
      </div>
    );
  }

  trendingCommunities() {
    return (
      <div>
        <h5>
          <T i18nKey="trending_communities">
            #
            <Link class="text-body" to="/communities">
              #
            </Link>
          </T>
        </h5>
        <ul class="list-inline">
          {this.state.trendingCommunities.map(community => (
            <li class="list-inline-item">
              <Link to={`/c/${community.name}`}>{community.name}</Link>
            </li>
          ))}
        </ul>
      </div>
    );
  }

  sidebar() {
    return (
      <div>
        {!this.state.showEditSite ? (
          this.siteInfo()
        ) : (
          <SiteForm
            site={this.state.siteRes.site}
            onCancel={this.handleEditCancel}
          />
        )}
      </div>
    );
  }

  updateUrl() {
    let listingTypeStr = ListingType[this.state.listingType].toLowerCase();
    let dataTypeStr = DataType[this.state.dataType].toLowerCase();
    let sortStr = SortType[this.state.sort].toLowerCase();
    this.props.history.push(
      `/home/data_type/${dataTypeStr}/listing_type/${listingTypeStr}/sort/${sortStr}/page/${this.state.page}`
    );
  }

  siteInfo() {
    return (
      <div>
        <div class="card border-secondary mb-3">
          <div class="card-body">
            <h5 class="mb-0">{`${this.state.siteRes.site.name}`}</h5>
            {this.canAdmin && (
              <ul class="list-inline mb-1 text-muted font-weight-bold">
                <li className="list-inline-item-action">
                  <span
                    class="pointer"
                    onClick={linkEvent(this, this.handleEditClick)}
                    data-tippy-content={i18n.t('edit')}
                  >
                    <svg class="icon icon-inline">
                      <use xlinkHref="#icon-edit"></use>
                    </svg>
                  </span>
                </li>
              </ul>
            )}
            <ul class="my-2 list-inline">
              {/*
              <li className="list-inline-item badge badge-secondary">
                {i18n.t('number_online', { count: this.state.siteRes.online })}
              </li>
              */}
              <li className="list-inline-item badge badge-secondary">
                {i18n.t('number_of_users', {
                  count: this.state.siteRes.site.number_of_users,
                })}
              </li>
              <li className="list-inline-item badge badge-secondary">
                {i18n.t('number_of_communities', {
                  count: this.state.siteRes.site.number_of_communities,
                })}
              </li>
              <li className="list-inline-item badge badge-secondary">
                {i18n.t('number_of_posts', {
                  count: this.state.siteRes.site.number_of_posts,
                })}
              </li>
              <li className="list-inline-item badge badge-secondary">
                {i18n.t('number_of_comments', {
                  count: this.state.siteRes.site.number_of_comments,
                })}
              </li>
              <li className="list-inline-item">
                <Link className="badge badge-secondary" to="/modlog">
                  {i18n.t('modlog')}
                </Link>
              </li>
            </ul>
            <ul class="mt-1 list-inline small mb-0">
              <li class="list-inline-item">{i18n.t('admins')}:</li>
              {this.state.siteRes.admins.map(admin => (
                <li class="list-inline-item">
                  <UserListing
                    user={{
                      name: admin.name,
                      avatar: admin.avatar,
                    }}
                  />
                </li>
              ))}
            </ul>
          </div>
        </div>
        {this.state.siteRes.site.description && (
          <div class="card border-secondary mb-3">
            <div class="card-body">
              <div
                className="md-div"
                dangerouslySetInnerHTML={mdToHtml(
                  this.state.siteRes.site.description
                )}
              />
            </div>
          </div>
        )}
      </div>
    );
  }

  landing() {
    return (
      <div class="card border-secondary">
        <div class="card-body">
          <h5>
            {i18n.t('powered_by')}
            <svg class="icon mx-2">
              <use xlinkHref="#icon-mouse">#</use>
            </svg>
            <a href={repoUrl}>
              Lemmy<sup>beta</sup>
            </a>
          </h5>
          <p class="mb-0">
            <T i18nKey="landing_0">
              #
              <a href="https://en.wikipedia.org/wiki/Social_network_aggregation">
                #
              </a>
              <a href="https://en.wikipedia.org/wiki/Fediverse">#</a>
              <br></br>
              <code>#</code>
              <br></br>
              <b>#</b>
              <br></br>
              <a href={repoUrl}>#</a>
              <br></br>
              <a href="https://www.rust-lang.org">#</a>
              <a href="https://actix.rs/">#</a>
              <a href="https://infernojs.org">#</a>
              <a href="https://www.typescriptlang.org/">#</a>
            </T>
          </p>
        </div>
      </div>
    );
  }

  posts() {
    return (
      <div class="main-content-wrapper">
        {this.selects()}
        {this.state.loading ? (
          <h5>
            <svg class="icon icon-spinner spin">
              <use xlinkHref="#icon-spinner"></use>
            </svg>
          </h5>
        ) : (
          <div>
            {this.listings()}
            {this.paginator()}
          </div>
        )}
      </div>
    );
  }

  listings() {
    return this.state.dataType == DataType.Post ? (
      <PostListings
        posts={this.state.posts}
        showCommunity
        removeDuplicates
        sort={this.state.sort}
      />
    ) : (
      <CommentNodes
        nodes={commentsToFlatNodes(this.state.comments)}
        noIndent
        showCommunity
        sortType={this.state.sort}
        showContext
      />
    );
  }

  selects() {
    return (
      <div className="mb-3">
        <span class="mr-3">
          <DataTypeSelect
            type_={this.state.dataType}
            onChange={this.handleDataTypeChange}
          />
        </span>
        <span class="mr-3">
          <ListingTypeSelect
            type_={this.state.listingType}
            onChange={this.handleListingTypeChange}
          />
        </span>
        <span class="mr-2">
          <SortSelect sort={this.state.sort} onChange={this.handleSortChange} />
        </span>
        {this.state.listingType == ListingType.All && (
          <a
            href={`/feeds/all.xml?sort=${SortType[this.state.sort]}`}
            target="_blank"
            title="RSS"
          >
            <svg class="icon text-muted small">
              <use xlinkHref="#icon-rss">#</use>
            </svg>
          </a>
        )}
        {UserService.Instance.user &&
          this.state.listingType == ListingType.Subscribed && (
            <a
              href={`/feeds/front/${UserService.Instance.auth}.xml?sort=${
                SortType[this.state.sort]
              }`}
              target="_blank"
              title="RSS"
            >
              <svg class="icon text-muted small">
                <use xlinkHref="#icon-rss">#</use>
              </svg>
            </a>
          )}
      </div>
    );
  }

  paginator() {
    return (
      <div class="my-2">
        {this.state.page > 1 && (
          <button
            class="btn btn-sm btn-secondary mr-1"
            onClick={linkEvent(this, this.prevPage)}
          >
            {i18n.t('prev')}
          </button>
        )}
        {this.state.posts.length == fetchLimit && (
          <button
            class="btn btn-sm btn-secondary"
            onClick={linkEvent(this, this.nextPage)}
          >
            {i18n.t('next')}
          </button>
        )}
      </div>
    );
  }

  get canAdmin(): boolean {
    return (
      UserService.Instance.user &&
      this.state.siteRes.admins
        .map(a => a.id)
        .includes(UserService.Instance.user.id)
    );
  }

  handleEditClick(i: Main) {
    i.state.showEditSite = true;
    i.setState(i.state);
  }

  handleEditCancel() {
    this.state.showEditSite = false;
    this.setState(this.state);
  }

  nextPage(i: Main) {
    i.state.page++;
    i.state.loading = true;
    i.setState(i.state);
    i.updateUrl();
    i.fetchData();
    window.scrollTo(0, 0);
  }

  prevPage(i: Main) {
    i.state.page--;
    i.state.loading = true;
    i.setState(i.state);
    i.updateUrl();
    i.fetchData();
    window.scrollTo(0, 0);
  }

  handleSortChange(val: SortType) {
    this.state.sort = val;
    this.state.page = 1;
    this.state.loading = true;
    this.setState(this.state);
    this.updateUrl();
    this.fetchData();
    window.scrollTo(0, 0);
  }

  handleListingTypeChange(val: ListingType) {
    this.state.listingType = val;
    this.state.page = 1;
    this.state.loading = true;
    this.setState(this.state);
    this.updateUrl();
    this.fetchData();
    window.scrollTo(0, 0);
  }

  handleDataTypeChange(val: DataType) {
    this.state.dataType = val;
    this.state.page = 1;
    this.state.loading = true;
    this.setState(this.state);
    this.updateUrl();
    this.fetchData();
    window.scrollTo(0, 0);
  }

  fetchData() {
    if (this.state.dataType == DataType.Post) {
      let getPostsForm: GetPostsForm = {
        page: this.state.page,
        limit: fetchLimit,
        sort: SortType[this.state.sort],
        type_: ListingType[this.state.listingType],
      };
      WebSocketService.Instance.getPosts(getPostsForm);
    } else {
      let getCommentsForm: GetCommentsForm = {
        page: this.state.page,
        limit: fetchLimit,
        sort: SortType[this.state.sort],
        type_: ListingType[this.state.listingType],
      };
      WebSocketService.Instance.getComments(getCommentsForm);
    }
  }

  parseMessage(msg: WebSocketJsonResponse) {
    console.log(msg);
    let res = wsJsonToRes(msg);
    if (msg.error) {
      toast(i18n.t(msg.error), 'danger');
      return;
    } else if (msg.reconnect) {
      this.fetchData();
    } else if (res.op == UserOperation.GetFollowedCommunities) {
      let data = res.data as GetFollowedCommunitiesResponse;
      this.state.subscribedCommunities = data.communities;
      this.setState(this.state);
    } else if (res.op == UserOperation.ListCommunities) {
      let data = res.data as ListCommunitiesResponse;
      this.state.trendingCommunities = data.communities;
      this.setState(this.state);
    } else if (res.op == UserOperation.GetSite) {
      let data = res.data as GetSiteResponse;

      // This means it hasn't been set up yet
      if (!data.site) {
        this.context.router.history.push('/setup');
      }
      this.state.siteRes.admins = data.admins;
      this.state.siteRes.site = data.site;
      this.state.siteRes.banned = data.banned;
      this.state.siteRes.online = data.online;
      this.setState(this.state);
      document.title = `${WebSocketService.Instance.site.name}`;
    } else if (res.op == UserOperation.EditSite) {
      let data = res.data as SiteResponse;
      this.state.siteRes.site = data.site;
      this.state.showEditSite = false;
      this.setState(this.state);
      toast(i18n.t('site_saved'));
    } else if (res.op == UserOperation.GetPosts) {
      let data = res.data as GetPostsResponse;
      this.state.posts = data.posts;
      this.state.loading = false;
      this.setState(this.state);
      setupTippy();
    } else if (res.op == UserOperation.CreatePost) {
      let data = res.data as PostResponse;

      // If you're on subscribed, only push it if you're subscribed.
      if (this.state.listingType == ListingType.Subscribed) {
        if (
          this.state.subscribedCommunities
            .map(c => c.community_id)
            .includes(data.post.community_id)
        ) {
          this.state.posts.unshift(data.post);
        }
      } else {
        // NSFW posts
        let nsfw = data.post.nsfw || data.post.community_nsfw;

        // Don't push the post if its nsfw, and don't have that setting on
        if (
          !nsfw ||
          (nsfw &&
            UserService.Instance.user &&
            UserService.Instance.user.show_nsfw)
        ) {
          this.state.posts.unshift(data.post);
        }
      }
      this.setState(this.state);
    } else if (res.op == UserOperation.EditPost) {
      let data = res.data as PostResponse;
      editPostFindRes(data, this.state.posts);
      this.setState(this.state);
    } else if (res.op == UserOperation.CreatePostLike) {
      let data = res.data as PostResponse;
      createPostLikeFindRes(data, this.state.posts);
      this.setState(this.state);
    } else if (res.op == UserOperation.AddAdmin) {
      let data = res.data as AddAdminResponse;
      this.state.siteRes.admins = data.admins;
      this.setState(this.state);
    } else if (res.op == UserOperation.BanUser) {
      let data = res.data as BanUserResponse;
      let found = this.state.siteRes.banned.find(u => (u.id = data.user.id));

      // Remove the banned if its found in the list, and the action is an unban
      if (found && !data.banned) {
        this.state.siteRes.banned = this.state.siteRes.banned.filter(
          i => i.id !== data.user.id
        );
      } else {
        this.state.siteRes.banned.push(data.user);
      }

      this.state.posts
        .filter(p => p.creator_id == data.user.id)
        .forEach(p => (p.banned = data.banned));

      this.setState(this.state);
    } else if (res.op == UserOperation.GetComments) {
      let data = res.data as GetCommentsResponse;
      this.state.comments = data.comments;
      this.state.loading = false;
      this.setState(this.state);
    } else if (res.op == UserOperation.EditComment) {
      let data = res.data as CommentResponse;
      editCommentRes(data, this.state.comments);
      this.setState(this.state);
    } else if (res.op == UserOperation.CreateComment) {
      let data = res.data as CommentResponse;

      // Necessary since it might be a user reply
      if (data.recipient_ids.length == 0) {
        // If you're on subscribed, only push it if you're subscribed.
        if (this.state.listingType == ListingType.Subscribed) {
          if (
            this.state.subscribedCommunities
              .map(c => c.community_id)
              .includes(data.comment.community_id)
          ) {
            this.state.comments.unshift(data.comment);
          }
        } else {
          this.state.comments.unshift(data.comment);
        }
        this.setState(this.state);
      }
    } else if (res.op == UserOperation.SaveComment) {
      let data = res.data as CommentResponse;
      saveCommentRes(data, this.state.comments);
      this.setState(this.state);
    } else if (res.op == UserOperation.CreateCommentLike) {
      let data = res.data as CommentResponse;
      createCommentLikeRes(data, this.state.comments);
      this.setState(this.state);
    }
  }
}