import { Component, linkEvent } from "inferno";
import {
  AddModToCommunityResponse,
  BanFromCommunityResponse,
  BlockPersonResponse,
  CommentReportResponse,
  CommentResponse,
  CommentView,
  CommunityResponse,
  GetComments,
  GetCommentsResponse,
  GetCommunity,
  GetCommunityResponse,
  GetPosts,
  GetPostsResponse,
  GetSiteResponse,
  ListingType,
  PostReportResponse,
  PostResponse,
  PostView,
  SortType,
  UserOperation,
} from "lemmy-js-client";
import { Subscription } from "rxjs";
import { i18n } from "../../i18next";
import { DataType, InitialFetchRequest } from "../../interfaces";
import { UserService, WebSocketService } from "../../services";
import {
  authField,
  commentsToFlatNodes,
  communityRSSUrl,
  createCommentLikeRes,
  createPostLikeFindRes,
  editCommentRes,
  editPostFindRes,
  fetchLimit,
  getDataTypeFromProps,
  getPageFromProps,
  getSortTypeFromProps,
  notifyPost,
  relTags,
  restoreScrollPosition,
  saveCommentRes,
  saveScrollPosition,
  setIsoData,
  setOptionalAuth,
  setupTippy,
  toast,
  updatePersonBlock,
  wsClient,
  wsJsonToRes,
  wsSubscribe,
  wsUserOp,
} from "../../utils";
import { CommentNodes } from "../comment/comment-nodes";
import { BannerIconHeader } from "../common/banner-icon-header";
import { DataTypeSelect } from "../common/data-type-select";
import { HtmlTags } from "../common/html-tags";
import { Icon, Spinner } from "../common/icon";
import { Paginator } from "../common/paginator";
import { SortSelect } from "../common/sort-select";
import { Sidebar } from "../community/sidebar";
import { PostListings } from "../post/post-listings";
import { CommunityLink } from "./community-link";

interface State {
  communityRes: GetCommunityResponse;
  siteRes: GetSiteResponse;
  communityName: string;
  communityLoading: boolean;
  postsLoading: boolean;
  commentsLoading: boolean;
  posts: PostView[];
  comments: CommentView[];
  dataType: DataType;
  sort: SortType;
  page: number;
  showSidebarMobile: boolean;
}

interface CommunityProps {
  dataType: DataType;
  sort: SortType;
  page: number;
}

interface UrlParams {
  dataType?: string;
  sort?: SortType;
  page?: number;
}

export class Community extends Component<any, State> {
  private isoData = setIsoData(this.context);
  private subscription: Subscription;
  private emptyState: State = {
    communityRes: undefined,
    communityName: this.props.match.params.name,
    communityLoading: true,
    postsLoading: true,
    commentsLoading: true,
    posts: [],
    comments: [],
    dataType: getDataTypeFromProps(this.props),
    sort: getSortTypeFromProps(this.props),
    page: getPageFromProps(this.props),
    siteRes: this.isoData.site_res,
    showSidebarMobile: false,
  };

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

    this.state = this.emptyState;
    this.handleSortChange = this.handleSortChange.bind(this);
    this.handleDataTypeChange = this.handleDataTypeChange.bind(this);
    this.handlePageChange = this.handlePageChange.bind(this);

    this.parseMessage = this.parseMessage.bind(this);
    this.subscription = wsSubscribe(this.parseMessage);

    // Only fetch the data if coming from another route
    if (this.isoData.path == this.context.router.route.match.url) {
      this.state.communityRes = this.isoData.routeData[0];
      if (this.state.dataType == DataType.Post) {
        this.state.posts = this.isoData.routeData[1].posts;
      } else {
        this.state.comments = this.isoData.routeData[1].comments;
      }
      this.state.communityLoading = false;
      this.state.postsLoading = false;
      this.state.commentsLoading = false;
    } else {
      this.fetchCommunity();
      this.fetchData();
    }
  }

  fetchCommunity() {
    let form: GetCommunity = {
      name: this.state.communityName ? this.state.communityName : null,
      auth: authField(false),
    };
    WebSocketService.Instance.send(wsClient.getCommunity(form));
  }

  componentDidMount() {
    setupTippy();
  }

  componentWillUnmount() {
    saveScrollPosition(this.context);
    this.subscription.unsubscribe();
    window.isoData.path = undefined;
  }

  static getDerivedStateFromProps(props: any): CommunityProps {
    return {
      dataType: getDataTypeFromProps(props),
      sort: getSortTypeFromProps(props),
      page: getPageFromProps(props),
    };
  }

  static fetchInitialData(req: InitialFetchRequest): Promise<any>[] {
    let pathSplit = req.path.split("/");
    let promises: Promise<any>[] = [];

    let communityName = pathSplit[2];
    let communityForm: GetCommunity = { name: communityName };
    setOptionalAuth(communityForm, req.auth);
    promises.push(req.client.getCommunity(communityForm));

    let dataType: DataType = pathSplit[4]
      ? DataType[pathSplit[4]]
      : DataType.Post;

    let sort: SortType = pathSplit[6]
      ? SortType[pathSplit[6]]
      : UserService.Instance.myUserInfo
      ? Object.values(SortType)[
          UserService.Instance.myUserInfo.local_user_view.local_user
            .default_sort_type
        ]
      : SortType.Active;

    let page = pathSplit[8] ? Number(pathSplit[8]) : 1;

    if (dataType == DataType.Post) {
      let getPostsForm: GetPosts = {
        page,
        limit: fetchLimit,
        sort,
        type_: ListingType.Community,
        saved_only: false,
      };
      setOptionalAuth(getPostsForm, req.auth);
      this.setName(getPostsForm, communityName);
      promises.push(req.client.getPosts(getPostsForm));
    } else {
      let getCommentsForm: GetComments = {
        page,
        limit: fetchLimit,
        sort,
        type_: ListingType.Community,
        saved_only: false,
      };
      this.setName(getCommentsForm, communityName);
      setOptionalAuth(getCommentsForm, req.auth);
      promises.push(req.client.getComments(getCommentsForm));
    }

    return promises;
  }

  static setName(obj: any, name_: string) {
    obj.community_name = name_;
  }

  componentDidUpdate(_: any, lastState: State) {
    if (
      lastState.dataType !== this.state.dataType ||
      lastState.sort !== this.state.sort ||
      lastState.page !== this.state.page
    ) {
      this.setState({ postsLoading: true, commentsLoading: true });
      this.fetchData();
    }
  }

  get documentTitle(): string {
    return `${this.state.communityRes.community_view.community.title} - ${this.state.siteRes.site_view.site.name}`;
  }

  render() {
    let cv = this.state.communityRes?.community_view;
    return (
      <div class="container">
        {this.state.communityLoading ? (
          <h5>
            <Spinner large />
          </h5>
        ) : (
          <>
            <HtmlTags
              title={this.documentTitle}
              path={this.context.router.route.match.url}
              description={cv.community.description}
              image={cv.community.icon}
            />

            <div class="row">
              <div class="col-12 col-md-8">
                {this.communityInfo()}
                <div class="d-block d-md-none">
                  <button
                    class="btn btn-secondary d-inline-block mb-2 mr-3"
                    onClick={linkEvent(this, this.handleShowSidebarMobile)}
                  >
                    {i18n.t("sidebar")}{" "}
                    <Icon
                      icon={
                        this.state.showSidebarMobile
                          ? `minus-square`
                          : `plus-square`
                      }
                      classes="icon-inline"
                    />
                  </button>
                  {this.state.showSidebarMobile && (
                    <Sidebar
                      community_view={cv}
                      moderators={this.state.communityRes.moderators}
                      admins={this.state.siteRes.admins}
                      online={this.state.communityRes.online}
                      enableNsfw={this.state.siteRes.site_view.site.enable_nsfw}
                    />
                  )}
                </div>
                {this.selects()}
                {this.listings()}
                <Paginator
                  page={this.state.page}
                  onChange={this.handlePageChange}
                />
              </div>
              <div class="d-none d-md-block col-md-4">
                <Sidebar
                  community_view={cv}
                  moderators={this.state.communityRes.moderators}
                  admins={this.state.siteRes.admins}
                  online={this.state.communityRes.online}
                  enableNsfw={this.state.siteRes.site_view.site.enable_nsfw}
                />
              </div>
            </div>
          </>
        )}
      </div>
    );
  }

  listings() {
    let site = this.state.siteRes.site_view.site;
    return this.state.dataType == DataType.Post ? (
      this.state.postsLoading ? (
        <h5>
          <Spinner large />
        </h5>
      ) : (
        <PostListings
          posts={this.state.posts}
          removeDuplicates
          enableDownvotes={site.enable_downvotes}
          enableNsfw={site.enable_nsfw}
        />
      )
    ) : this.state.commentsLoading ? (
      <h5>
        <Spinner large />
      </h5>
    ) : (
      <CommentNodes
        nodes={commentsToFlatNodes(this.state.comments)}
        noIndent
        showContext
        enableDownvotes={site.enable_downvotes}
      />
    );
  }

  communityInfo() {
    let community = this.state.communityRes.community_view.community;
    return (
      <div class="mb-2">
        <BannerIconHeader banner={community.banner} icon={community.icon} />
        <h5 class="mb-0 overflow-wrap-anywhere">{community.title}</h5>
        <CommunityLink
          community={community}
          realLink
          useApubName
          muted
          hideAvatar
        />
      </div>
    );
  }

  selects() {
    let communityRss = communityRSSUrl(
      this.state.communityRes.community_view.community.actor_id,
      this.state.sort
    );
    return (
      <div class="mb-3">
        <span class="mr-3">
          <DataTypeSelect
            type_={this.state.dataType}
            onChange={this.handleDataTypeChange}
          />
        </span>
        <span class="mr-2">
          <SortSelect sort={this.state.sort} onChange={this.handleSortChange} />
        </span>
        <a href={communityRss} title="RSS" rel={relTags}>
          <Icon icon="rss" classes="text-muted small" />
        </a>
        <link rel="alternate" type="application/atom+xml" href={communityRss} />
      </div>
    );
  }

  handlePageChange(page: number) {
    this.updateUrl({ page });
    window.scrollTo(0, 0);
  }

  handleSortChange(val: SortType) {
    this.updateUrl({ sort: val, page: 1 });
    window.scrollTo(0, 0);
  }

  handleDataTypeChange(val: DataType) {
    this.updateUrl({ dataType: DataType[val], page: 1 });
    window.scrollTo(0, 0);
  }

  handleShowSidebarMobile(i: Community) {
    i.state.showSidebarMobile = !i.state.showSidebarMobile;
    i.setState(i.state);
  }

  updateUrl(paramUpdates: UrlParams) {
    const dataTypeStr = paramUpdates.dataType || DataType[this.state.dataType];
    const sortStr = paramUpdates.sort || this.state.sort;
    const page = paramUpdates.page || this.state.page;

    let typeView = `/c/${this.state.communityName}`;

    this.props.history.push(
      `${typeView}/data_type/${dataTypeStr}/sort/${sortStr}/page/${page}`
    );
  }

  fetchData() {
    if (this.state.dataType == DataType.Post) {
      let form: GetPosts = {
        page: this.state.page,
        limit: fetchLimit,
        sort: this.state.sort,
        type_: ListingType.Community,
        community_name: this.state.communityName,
        saved_only: false,
        auth: authField(false),
      };
      WebSocketService.Instance.send(wsClient.getPosts(form));
    } else {
      let form: GetComments = {
        page: this.state.page,
        limit: fetchLimit,
        sort: this.state.sort,
        type_: ListingType.Community,
        community_name: this.state.communityName,
        saved_only: false,
        auth: authField(false),
      };
      WebSocketService.Instance.send(wsClient.getComments(form));
    }
  }

  parseMessage(msg: any) {
    let op = wsUserOp(msg);
    console.log(msg);
    if (msg.error) {
      toast(i18n.t(msg.error), "danger");
      this.context.router.history.push("/");
      return;
    } else if (msg.reconnect) {
      WebSocketService.Instance.send(
        wsClient.communityJoin({
          community_id: this.state.communityRes.community_view.community.id,
        })
      );
      this.fetchData();
    } else if (op == UserOperation.GetCommunity) {
      let data = wsJsonToRes<GetCommunityResponse>(msg).data;
      this.state.communityRes = data;
      this.state.communityLoading = false;
      this.setState(this.state);
      // TODO why is there no auth in this form?
      WebSocketService.Instance.send(
        wsClient.communityJoin({
          community_id: data.community_view.community.id,
        })
      );
    } else if (
      op == UserOperation.EditCommunity ||
      op == UserOperation.DeleteCommunity ||
      op == UserOperation.RemoveCommunity
    ) {
      let data = wsJsonToRes<CommunityResponse>(msg).data;
      this.state.communityRes.community_view = data.community_view;
      this.setState(this.state);
    } else if (op == UserOperation.FollowCommunity) {
      let data = wsJsonToRes<CommunityResponse>(msg).data;
      this.state.communityRes.community_view.subscribed =
        data.community_view.subscribed;
      this.state.communityRes.community_view.counts.subscribers =
        data.community_view.counts.subscribers;
      this.setState(this.state);
    } else if (op == UserOperation.GetPosts) {
      let data = wsJsonToRes<GetPostsResponse>(msg).data;
      this.state.posts = data.posts;
      this.state.postsLoading = false;
      this.setState(this.state);
      restoreScrollPosition(this.context);
      setupTippy();
    } else if (
      op == UserOperation.EditPost ||
      op == UserOperation.DeletePost ||
      op == UserOperation.RemovePost ||
      op == UserOperation.LockPost ||
      op == UserOperation.StickyPost ||
      op == UserOperation.SavePost
    ) {
      let data = wsJsonToRes<PostResponse>(msg).data;
      editPostFindRes(data.post_view, this.state.posts);
      this.setState(this.state);
    } else if (op == UserOperation.CreatePost) {
      let data = wsJsonToRes<PostResponse>(msg).data;
      this.state.posts.unshift(data.post_view);
      if (
        UserService.Instance.myUserInfo?.local_user_view.local_user
          .show_new_post_notifs
      ) {
        notifyPost(data.post_view, this.context.router);
      }
      this.setState(this.state);
    } else if (op == UserOperation.CreatePostLike) {
      let data = wsJsonToRes<PostResponse>(msg).data;
      createPostLikeFindRes(data.post_view, this.state.posts);
      this.setState(this.state);
    } else if (op == UserOperation.AddModToCommunity) {
      let data = wsJsonToRes<AddModToCommunityResponse>(msg).data;
      this.state.communityRes.moderators = data.moderators;
      this.setState(this.state);
    } else if (op == UserOperation.BanFromCommunity) {
      let data = wsJsonToRes<BanFromCommunityResponse>(msg).data;

      // TODO this might be incorrect
      this.state.posts
        .filter(p => p.creator.id == data.person_view.person.id)
        .forEach(p => (p.creator_banned_from_community = data.banned));

      this.setState(this.state);
    } else if (op == UserOperation.GetComments) {
      let data = wsJsonToRes<GetCommentsResponse>(msg).data;
      this.state.comments = data.comments;
      this.state.commentsLoading = false;
      this.setState(this.state);
    } else if (
      op == UserOperation.EditComment ||
      op == UserOperation.DeleteComment ||
      op == UserOperation.RemoveComment
    ) {
      let data = wsJsonToRes<CommentResponse>(msg).data;
      editCommentRes(data.comment_view, this.state.comments);
      this.setState(this.state);
    } else if (op == UserOperation.CreateComment) {
      let data = wsJsonToRes<CommentResponse>(msg).data;

      // Necessary since it might be a user reply
      if (data.form_id) {
        this.state.comments.unshift(data.comment_view);
        this.setState(this.state);
      }
    } else if (op == UserOperation.SaveComment) {
      let data = wsJsonToRes<CommentResponse>(msg).data;
      saveCommentRes(data.comment_view, this.state.comments);
      this.setState(this.state);
    } else if (op == UserOperation.CreateCommentLike) {
      let data = wsJsonToRes<CommentResponse>(msg).data;
      createCommentLikeRes(data.comment_view, this.state.comments);
      this.setState(this.state);
    } else if (op == UserOperation.BlockPerson) {
      let data = wsJsonToRes<BlockPersonResponse>(msg).data;
      updatePersonBlock(data);
    } else if (op == UserOperation.CreatePostReport) {
      let data = wsJsonToRes<PostReportResponse>(msg).data;
      if (data) {
        toast(i18n.t("report_created"));
      }
    } else if (op == UserOperation.CreateCommentReport) {
      let data = wsJsonToRes<CommentReportResponse>(msg).data;
      if (data) {
        toast(i18n.t("report_created"));
      }
    }
  }
}