import { Component, linkEvent } from 'inferno';
import { Helmet } from 'inferno-helmet';
import { Subscription } from 'rxjs';
import { retryWhen, delay, take } from 'rxjs/operators';
import {
  UserOperation,
  Post,
  Comment,
  Community,
  UserView,
  SortType,
  SearchForm,
  SearchResponse,
  SearchType,
  PostResponse,
  CommentResponse,
  WebSocketJsonResponse,
  GetSiteResponse,
  Site,
} from 'lemmy-js-client';
import { WebSocketService } from '../services';
import {
  wsJsonToRes,
  fetchLimit,
  routeSearchTypeToEnum,
  routeSortTypeToEnum,
  toast,
  createCommentLikeRes,
  createPostLikeFindRes,
  commentsToFlatNodes,
  getPageFromProps,
} from '../utils';
import { PostListing } from './post-listing';
import { UserListing } from './user-listing';
import { CommunityLink } from './community-link';
import { SortSelect } from './sort-select';
import { CommentNodes } from './comment-nodes';
import { i18n } from '../i18next';

interface SearchState {
  q: string;
  type_: SearchType;
  sort: SortType;
  page: number;
  searchResponse: SearchResponse;
  loading: boolean;
  site: Site;
  searchText: string;
}

interface SearchProps {
  q: string;
  type_: SearchType;
  sort: SortType;
  page: number;
}

interface UrlParams {
  q?: string;
  type_?: SearchType;
  sort?: SortType;
  page?: number;
}

export class Search extends Component<any, SearchState> {
  private subscription: Subscription;
  private emptyState: SearchState = {
    q: Search.getSearchQueryFromProps(this.props),
    type_: Search.getSearchTypeFromProps(this.props),
    sort: Search.getSortTypeFromProps(this.props),
    page: getPageFromProps(this.props),
    searchText: Search.getSearchQueryFromProps(this.props),
    searchResponse: {
      type_: null,
      posts: [],
      comments: [],
      communities: [],
      users: [],
    },
    loading: false,
    site: {
      id: undefined,
      name: undefined,
      creator_id: undefined,
      published: undefined,
      creator_name: undefined,
      number_of_users: undefined,
      number_of_posts: undefined,
      number_of_comments: undefined,
      number_of_communities: undefined,
      enable_downvotes: undefined,
      open_registration: undefined,
      enable_nsfw: undefined,
    },
  };

  static getSearchQueryFromProps(props: any): string {
    return props.match.params.q ? props.match.params.q : '';
  }

  static getSearchTypeFromProps(props: any): SearchType {
    return props.match.params.type
      ? routeSearchTypeToEnum(props.match.params.type)
      : SearchType.All;
  }

  static getSortTypeFromProps(props: any): SortType {
    return props.match.params.sort
      ? routeSortTypeToEnum(props.match.params.sort)
      : SortType.TopAll;
  }

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

    this.state = this.emptyState;
    this.handleSortChange = this.handleSortChange.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 (this.state.q) {
      this.search();
    }
  }

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

  static getDerivedStateFromProps(props: any): SearchProps {
    return {
      q: Search.getSearchQueryFromProps(props),
      type_: Search.getSearchTypeFromProps(props),
      sort: Search.getSortTypeFromProps(props),
      page: getPageFromProps(props),
    };
  }

  componentDidUpdate(_: any, lastState: SearchState) {
    if (
      lastState.q !== this.state.q ||
      lastState.type_ !== this.state.type_ ||
      lastState.sort !== this.state.sort ||
      lastState.page !== this.state.page
    ) {
      this.setState({ loading: true, searchText: this.state.q });
      this.search();
    }
  }

  get documentTitle(): string {
    if (this.state.site.name) {
      if (this.state.q) {
        return `${i18n.t('search')} - ${this.state.q} - ${
          this.state.site.name
        }`;
      } else {
        return `${i18n.t('search')} - ${this.state.site.name}`;
      }
    } else {
      return 'Lemmy';
    }
  }

  render() {
    return (
      <div class="container">
        <Helmet title={this.documentTitle} />
        <h5>{i18n.t('search')}</h5>
        {this.selects()}
        {this.searchForm()}
        {this.state.type_ == SearchType.All && this.all()}
        {this.state.type_ == SearchType.Comments && this.comments()}
        {this.state.type_ == SearchType.Posts && this.posts()}
        {this.state.type_ == SearchType.Communities && this.communities()}
        {this.state.type_ == SearchType.Users && this.users()}
        {this.resultsCount() == 0 && <span>{i18n.t('no_results')}</span>}
        {this.paginator()}
      </div>
    );
  }

  searchForm() {
    return (
      <form
        class="form-inline"
        onSubmit={linkEvent(this, this.handleSearchSubmit)}
      >
        <input
          type="text"
          class="form-control mr-2 mb-2"
          value={this.state.searchText}
          placeholder={`${i18n.t('search')}...`}
          onInput={linkEvent(this, this.handleQChange)}
          required
          minLength={3}
        />
        <button type="submit" class="btn btn-secondary mr-2 mb-2">
          {this.state.loading ? (
            <svg class="icon icon-spinner spin">
              <use xlinkHref="#icon-spinner"></use>
            </svg>
          ) : (
            <span>{i18n.t('search')}</span>
          )}
        </button>
      </form>
    );
  }

  selects() {
    return (
      <div className="mb-2">
        <select
          value={this.state.type_}
          onChange={linkEvent(this, this.handleTypeChange)}
          class="custom-select w-auto mb-2"
        >
          <option disabled>{i18n.t('type')}</option>
          <option value={SearchType.All}>{i18n.t('all')}</option>
          <option value={SearchType.Comments}>{i18n.t('comments')}</option>
          <option value={SearchType.Posts}>{i18n.t('posts')}</option>
          <option value={SearchType.Communities}>
            {i18n.t('communities')}
          </option>
          <option value={SearchType.Users}>{i18n.t('users')}</option>
        </select>
        <span class="ml-2">
          <SortSelect
            sort={this.state.sort}
            onChange={this.handleSortChange}
            hideHot
          />
        </span>
      </div>
    );
  }

  all() {
    let combined: {
      type_: string;
      data: Comment | Post | Community | UserView;
    }[] = [];
    let comments = this.state.searchResponse.comments.map(e => {
      return { type_: 'comments', data: e };
    });
    let posts = this.state.searchResponse.posts.map(e => {
      return { type_: 'posts', data: e };
    });
    let communities = this.state.searchResponse.communities.map(e => {
      return { type_: 'communities', data: e };
    });
    let users = this.state.searchResponse.users.map(e => {
      return { type_: 'users', data: e };
    });

    combined.push(...comments);
    combined.push(...posts);
    combined.push(...communities);
    combined.push(...users);

    // Sort it
    if (this.state.sort == SortType.New) {
      combined.sort((a, b) => b.data.published.localeCompare(a.data.published));
    } else {
      combined.sort(
        (a, b) =>
          ((b.data as Comment | Post).score |
            (b.data as Community).number_of_subscribers |
            (b.data as UserView).comment_score) -
          ((a.data as Comment | Post).score |
            (a.data as Community).number_of_subscribers |
            (a.data as UserView).comment_score)
      );
    }

    return (
      <div>
        {combined.map(i => (
          <div class="row">
            <div class="col-12">
              {i.type_ == 'posts' && (
                <PostListing
                  key={(i.data as Post).id}
                  post={i.data as Post}
                  showCommunity
                  enableDownvotes={this.state.site.enable_downvotes}
                  enableNsfw={this.state.site.enable_nsfw}
                />
              )}
              {i.type_ == 'comments' && (
                <CommentNodes
                  key={(i.data as Comment).id}
                  nodes={[{ comment: i.data as Comment }]}
                  locked
                  noIndent
                  enableDownvotes={this.state.site.enable_downvotes}
                />
              )}
              {i.type_ == 'communities' && (
                <div>{this.communityListing(i.data as Community)}</div>
              )}
              {i.type_ == 'users' && (
                <div>
                  <span>
                    @
                    <UserListing
                      user={{
                        name: (i.data as UserView).name,
                        preferred_username: (i.data as UserView)
                          .preferred_username,
                        avatar: (i.data as UserView).avatar,
                      }}
                    />
                  </span>
                  <span>{` - ${i18n.t('number_of_comments', {
                    count: (i.data as UserView).number_of_comments,
                  })}`}</span>
                </div>
              )}
            </div>
          </div>
        ))}
      </div>
    );
  }

  comments() {
    return (
      <CommentNodes
        nodes={commentsToFlatNodes(this.state.searchResponse.comments)}
        locked
        noIndent
        enableDownvotes={this.state.site.enable_downvotes}
      />
    );
  }

  posts() {
    return (
      <>
        {this.state.searchResponse.posts.map(post => (
          <div class="row">
            <div class="col-12">
              <PostListing
                post={post}
                showCommunity
                enableDownvotes={this.state.site.enable_downvotes}
                enableNsfw={this.state.site.enable_nsfw}
              />
            </div>
          </div>
        ))}
      </>
    );
  }

  // Todo possibly create UserListing and CommunityListing
  communities() {
    return (
      <>
        {this.state.searchResponse.communities.map(community => (
          <div class="row">
            <div class="col-12">{this.communityListing(community)}</div>
          </div>
        ))}
      </>
    );
  }

  communityListing(community: Community) {
    return (
      <>
        <span>
          <CommunityLink community={community} />
        </span>
        <span>{` - ${community.title} - 
        ${i18n.t('number_of_subscribers', {
          count: community.number_of_subscribers,
        })}
      `}</span>
      </>
    );
  }

  users() {
    return (
      <>
        {this.state.searchResponse.users.map(user => (
          <div class="row">
            <div class="col-12">
              <span>
                @
                <UserListing
                  user={{
                    name: user.name,
                    avatar: user.avatar,
                  }}
                />
              </span>
              <span>{` - ${i18n.t('number_of_comments', {
                count: user.number_of_comments,
              })}`}</span>
            </div>
          </div>
        ))}
      </>
    );
  }

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

        {this.resultsCount() > 0 && (
          <button
            class="btn btn-secondary"
            onClick={linkEvent(this, this.nextPage)}
          >
            {i18n.t('next')}
          </button>
        )}
      </div>
    );
  }

  resultsCount(): number {
    let res = this.state.searchResponse;
    return (
      res.posts.length +
      res.comments.length +
      res.communities.length +
      res.users.length
    );
  }

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

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

  search() {
    let form: SearchForm = {
      q: this.state.q,
      type_: this.state.type_,
      sort: this.state.sort,
      page: this.state.page,
      limit: fetchLimit,
    };

    if (this.state.q != '') {
      WebSocketService.Instance.search(form);
    }
  }

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

  handleTypeChange(i: Search, event: any) {
    i.updateUrl({
      type_: SearchType[event.target.value],
      page: 1,
    });
  }

  handleSearchSubmit(i: Search, event: any) {
    event.preventDefault();
    i.updateUrl({
      q: i.state.searchText,
      type_: i.state.type_,
      sort: i.state.sort,
      page: i.state.page,
    });
  }

  handleQChange(i: Search, event: any) {
    i.setState({ searchText: event.target.value });
  }

  updateUrl(paramUpdates: UrlParams) {
    const qStr = paramUpdates.q || this.state.q;
    const typeStr = paramUpdates.type_ || this.state.type_;
    const sortStr = paramUpdates.sort || this.state.sort;
    const page = paramUpdates.page || this.state.page;
    this.props.history.push(
      `/search/q/${qStr}/type/${typeStr}/sort/${sortStr}/page/${page}`
    );
  }

  parseMessage(msg: WebSocketJsonResponse) {
    console.log(msg);
    let res = wsJsonToRes(msg);
    if (msg.error) {
      toast(i18n.t(msg.error), 'danger');
      return;
    } else if (res.op == UserOperation.Search) {
      let data = res.data as SearchResponse;
      this.state.searchResponse = data;
      this.state.loading = false;
      window.scrollTo(0, 0);
      this.setState(this.state);
    } else if (res.op == UserOperation.CreateCommentLike) {
      let data = res.data as CommentResponse;
      createCommentLikeRes(data, this.state.searchResponse.comments);
      this.setState(this.state);
    } else if (res.op == UserOperation.CreatePostLike) {
      let data = res.data as PostResponse;
      createPostLikeFindRes(data, this.state.searchResponse.posts);
      this.setState(this.state);
    } else if (res.op == UserOperation.GetSite) {
      let data = res.data as GetSiteResponse;
      this.state.site = data.site;
      this.setState(this.state);
    }
  }
}