import { Component, linkEvent, createRef, RefObject } from 'inferno';
import { Link } from 'inferno-router';
import { Subscription } from 'rxjs';
import { WebSocketService, UserService } from '../services';
import {
  UserOperation,
  GetRepliesForm,
  GetRepliesResponse,
  GetUserMentionsForm,
  GetUserMentionsResponse,
  GetPrivateMessagesForm,
  PrivateMessagesResponse,
  SortType,
  GetSiteResponse,
  Comment,
  CommentResponse,
  PrivateMessage,
  PrivateMessageResponse,
  WebSocketJsonResponse,
} from 'lemmy-js-client';
import {
  wsJsonToRes,
  showAvatars,
  fetchLimit,
  toast,
  setTheme,
  getLanguage,
  notifyComment,
  notifyPrivateMessage,
  isBrowser,
  wsSubscribe,
} from '../utils';
import { i18n } from '../i18next';
import { PictrsImage } from './pictrs-image';

interface NavbarProps {
  site: GetSiteResponse;
}

interface NavbarState {
  isLoggedIn: boolean;
  expanded: boolean;
  replies: Comment[];
  mentions: Comment[];
  messages: PrivateMessage[];
  unreadCount: number;
  searchParam: string;
  toggleSearch: boolean;
  onSiteBanner?(url: string): any;
}

export class Navbar extends Component<NavbarProps, NavbarState> {
  private wsSub: Subscription;
  private userSub: Subscription;
  private unreadCountSub: Subscription;
  private searchTextField: RefObject<HTMLInputElement>;
  emptyState: NavbarState = {
    isLoggedIn: !!this.props.site.my_user,
    unreadCount: 0,
    replies: [],
    mentions: [],
    messages: [],
    expanded: false,
    searchParam: '',
    toggleSearch: false,
  };
  subscription: any;

  constructor(props: any, context: any) {
    super(props, context);
    this.state = this.emptyState;

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

  componentDidMount() {
    // Subscribe to jwt changes
    if (isBrowser()) {
      this.searchTextField = createRef();
      console.log(`isLoggedIn = ${this.state.isLoggedIn}`);

      // On the first load, check the unreads
      if (this.state.isLoggedIn == false) {
        // setTheme(data.my_user.theme, true);
        // i18n.changeLanguage(getLanguage());
        // i18n.changeLanguage('de');
      } else {
        this.requestNotificationPermission();
        WebSocketService.Instance.userJoin();
        this.fetchUnreads();
      }

      this.userSub = UserService.Instance.jwtSub.subscribe(res => {
        // A login
        if (res !== undefined) {
          this.requestNotificationPermission();
          WebSocketService.Instance.getSite();
        } else {
          this.setState({ isLoggedIn: false });
        }
      });

      // Subscribe to unread count changes
      this.unreadCountSub = UserService.Instance.unreadCountSub.subscribe(
        res => {
          this.setState({ unreadCount: res });
        }
      );
    }
  }

  handleSearchParam(i: Navbar, event: any) {
    i.state.searchParam = event.target.value;
    i.setState(i.state);
  }

  updateUrl() {
    const searchParam = this.state.searchParam;
    this.setState({ searchParam: '' });
    this.setState({ toggleSearch: false });
    if (searchParam === '') {
      this.context.router.history.push(`/search/`);
    } else {
      const searchParamEncoded = encodeURIComponent(searchParam);
      this.context.router.history.push(
        `/search/q/${searchParamEncoded}/type/All/sort/TopAll/page/1`
      );
    }
  }

  handleSearchSubmit(i: Navbar, event: any) {
    event.preventDefault();
    i.updateUrl();
  }

  handleSearchBtn(i: Navbar, event: any) {
    event.preventDefault();
    i.setState({ toggleSearch: true });

    i.searchTextField.current.focus();
    const offsetWidth = i.searchTextField.current.offsetWidth;
    if (i.state.searchParam && offsetWidth > 100) {
      i.updateUrl();
    }
  }

  handleSearchBlur(i: Navbar, event: any) {
    if (!(event.relatedTarget && event.relatedTarget.name !== 'search-btn')) {
      i.state.toggleSearch = false;
      i.setState(i.state);
    }
  }

  render() {
    return this.navbar();
  }

  componentWillUnmount() {
    this.wsSub.unsubscribe();
    this.userSub.unsubscribe();
    this.unreadCountSub.unsubscribe();
  }

  // TODO class active corresponding to current page
  navbar() {
    let user = UserService.Instance.user;
    return (
      <nav class="navbar navbar-expand-lg navbar-light shadow-sm p-0 px-3">
        <div class="container">
          {this.props.site.site && (
            <Link
              title={this.props.site.version}
              className="d-flex align-items-center navbar-brand mr-md-3"
              to="/"
            >
              {this.props.site.site.icon && showAvatars() && (
                <PictrsImage src={this.props.site.site.icon} icon />
              )}
              {this.props.site.site.name}
            </Link>
          )}
          {this.state.isLoggedIn && (
            <Link
              className="ml-auto p-0 navbar-toggler nav-link border-0"
              to="/inbox"
              title={i18n.t('inbox')}
            >
              <svg class="icon">
                <use xlinkHref="#icon-bell"></use>
              </svg>
              {this.state.unreadCount > 0 && (
                <span class="mx-1 badge badge-light">
                  {this.state.unreadCount}
                </span>
              )}
            </Link>
          )}
          <button
            class="navbar-toggler border-0 p-1"
            type="button"
            aria-label="menu"
            onClick={linkEvent(this, this.expandNavbar)}
            data-tippy-content={i18n.t('expand_here')}
          >
            <span class="navbar-toggler-icon"></span>
          </button>
          <div
            className={`${!this.state.expanded && 'collapse'} navbar-collapse`}
          >
            <ul class="navbar-nav my-2 mr-auto">
              <li class="nav-item">
                <Link
                  className="nav-link"
                  to="/communities"
                  title={i18n.t('communities')}
                >
                  {i18n.t('communities')}
                </Link>
              </li>
              <li class="nav-item">
                <Link
                  className="nav-link"
                  to={{
                    pathname: '/create_post',
                    state: { prevPath: this.currentLocation },
                  }}
                  title={i18n.t('create_post')}
                >
                  {i18n.t('create_post')}
                </Link>
              </li>
              <li class="nav-item">
                <Link
                  className="nav-link"
                  to="/create_community"
                  title={i18n.t('create_community')}
                >
                  {i18n.t('create_community')}
                </Link>
              </li>
            </ul>
            <ul class="navbar-nav my-2">
              {this.canAdmin && (
                <li className="nav-item">
                  <Link
                    className="nav-link"
                    to={`/admin`}
                    title={i18n.t('admin_settings')}
                  >
                    <svg class="icon">
                      <use xlinkHref="#icon-settings"></use>
                    </svg>
                  </Link>
                </li>
              )}
            </ul>
            {!this.context.router.history.location.pathname.match(
              /^\/search/
            ) && (
              <form
                class="form-inline"
                onSubmit={linkEvent(this, this.handleSearchSubmit)}
              >
                <input
                  class={`form-control mr-0 search-input ${
                    this.state.toggleSearch ? 'show-input' : 'hide-input'
                  }`}
                  onInput={linkEvent(this, this.handleSearchParam)}
                  value={this.state.searchParam}
                  ref={this.searchTextField}
                  type="text"
                  placeholder={i18n.t('search')}
                  onBlur={linkEvent(this, this.handleSearchBlur)}
                ></input>
                <button
                  name="search-btn"
                  onClick={linkEvent(this, this.handleSearchBtn)}
                  class="px-1 btn btn-link"
                  style="color: var(--gray)"
                >
                  <svg class="icon">
                    <use xlinkHref="#icon-search"></use>
                  </svg>
                </button>
              </form>
            )}
            {this.state.isLoggedIn ? (
              <>
                <ul class="navbar-nav my-2">
                  <li className="nav-item">
                    <Link
                      className="nav-link"
                      to="/inbox"
                      title={i18n.t('inbox')}
                    >
                      <svg class="icon">
                        <use xlinkHref="#icon-bell"></use>
                      </svg>
                      {this.state.unreadCount > 0 && (
                        <span class="ml-1 badge badge-light">
                          {this.state.unreadCount}
                        </span>
                      )}
                    </Link>
                  </li>
                </ul>
                <ul class="navbar-nav">
                  <li className="nav-item">
                    <Link
                      className="nav-link"
                      to={`/u/${user.name}`}
                      title={i18n.t('settings')}
                    >
                      <span>
                        {user.avatar && showAvatars() && (
                          <PictrsImage src={user.avatar} icon />
                        )}
                        {user.preferred_username
                          ? user.preferred_username
                          : user.name}
                      </span>
                    </Link>
                  </li>
                </ul>
              </>
            ) : (
              <ul class="navbar-nav my-2">
                <li className="ml-2 nav-item">
                  <Link
                    className="btn btn-success"
                    to="/login"
                    title={i18n.t('login_sign_up')}
                  >
                    {i18n.t('login_sign_up')}
                  </Link>
                </li>
              </ul>
            )}
          </div>
        </div>
      </nav>
    );
  }

  expandNavbar(i: Navbar) {
    i.state.expanded = !i.state.expanded;
    i.setState(i.state);
  }

  parseMessage(msg: WebSocketJsonResponse) {
    let res = wsJsonToRes(msg);
    if (msg.error) {
      if (msg.error == 'not_logged_in') {
        UserService.Instance.logout();
        location.reload();
      }
      return;
    } else if (msg.reconnect) {
      WebSocketService.Instance.userJoin();
      this.fetchUnreads();
    } else if (res.op == UserOperation.GetReplies) {
      let data = res.data as GetRepliesResponse;
      let unreadReplies = data.replies.filter(r => !r.read);

      this.state.replies = unreadReplies;
      this.state.unreadCount = this.calculateUnreadCount();
      this.setState(this.state);
      this.sendUnreadCount();
    } else if (res.op == UserOperation.GetUserMentions) {
      let data = res.data as GetUserMentionsResponse;
      let unreadMentions = data.mentions.filter(r => !r.read);

      this.state.mentions = unreadMentions;
      this.state.unreadCount = this.calculateUnreadCount();
      this.setState(this.state);
      this.sendUnreadCount();
    } else if (res.op == UserOperation.GetPrivateMessages) {
      let data = res.data as PrivateMessagesResponse;
      let unreadMessages = data.messages.filter(r => !r.read);

      this.state.messages = unreadMessages;
      this.state.unreadCount = this.calculateUnreadCount();
      this.setState(this.state);
      this.sendUnreadCount();
    } else if (res.op == UserOperation.GetSite) {
      // This is only called on a successful login
      let data = res.data as GetSiteResponse;
      UserService.Instance.user = data.my_user;
      setTheme(UserService.Instance.user.theme);
      i18n.changeLanguage(getLanguage());
      this.state.isLoggedIn = true;
      this.setState(this.state);
    } else if (res.op == UserOperation.CreateComment) {
      let data = res.data as CommentResponse;

      if (this.state.isLoggedIn) {
        if (data.recipient_ids.includes(UserService.Instance.user.id)) {
          this.state.replies.push(data.comment);
          this.state.unreadCount++;
          this.setState(this.state);
          this.sendUnreadCount();
          notifyComment(data.comment, this.context.router);
        }
      }
    } else if (res.op == UserOperation.CreatePrivateMessage) {
      let data = res.data as PrivateMessageResponse;

      if (this.state.isLoggedIn) {
        if (data.message.recipient_id == UserService.Instance.user.id) {
          this.state.messages.push(data.message);
          this.state.unreadCount++;
          this.setState(this.state);
          this.sendUnreadCount();
          notifyPrivateMessage(data.message, this.context.router);
        }
      }
    }
  }

  fetchUnreads() {
    console.log('Fetching unreads...');
    let repliesForm: GetRepliesForm = {
      sort: SortType.New,
      unread_only: true,
      page: 1,
      limit: fetchLimit,
    };

    let userMentionsForm: GetUserMentionsForm = {
      sort: SortType.New,
      unread_only: true,
      page: 1,
      limit: fetchLimit,
    };

    let privateMessagesForm: GetPrivateMessagesForm = {
      unread_only: true,
      page: 1,
      limit: fetchLimit,
    };

    if (this.currentLocation !== '/inbox') {
      WebSocketService.Instance.getReplies(repliesForm);
      WebSocketService.Instance.getUserMentions(userMentionsForm);
      WebSocketService.Instance.getPrivateMessages(privateMessagesForm);
    }
  }

  get currentLocation() {
    return this.context.router.history.location.pathname;
  }

  sendUnreadCount() {
    UserService.Instance.unreadCountSub.next(this.state.unreadCount);
  }

  calculateUnreadCount(): number {
    return (
      this.state.replies.filter(r => !r.read).length +
      this.state.mentions.filter(r => !r.read).length +
      this.state.messages.filter(r => !r.read).length
    );
  }

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

  requestNotificationPermission() {
    if (UserService.Instance.user) {
      document.addEventListener('DOMContentLoaded', function () {
        if (!Notification) {
          toast(i18n.t('notifications_error'), 'danger');
          return;
        }

        if (Notification.permission !== 'granted')
          Notification.requestPermission();
      });
    }
  }
}