import { useCallback } from 'react';

import { updateConversations } from 'pl-fe/actions/conversations';
import { fetchFilters } from 'pl-fe/actions/filters';
import { updateNotificationsQueue } from 'pl-fe/actions/notifications';
import { getLocale, getSettings } from 'pl-fe/actions/settings';
import { updateStatus } from 'pl-fe/actions/statuses';
import { deleteFromTimelines, processTimelineUpdate } from 'pl-fe/actions/timelines';
import { useStatContext } from 'pl-fe/contexts/stat-context';
import { importEntities } from 'pl-fe/entity-store/actions';
import { Entities } from 'pl-fe/entity-store/entities';
import { selectEntity } from 'pl-fe/entity-store/selectors';
import { useAppDispatch, useLoggedIn } from 'pl-fe/hooks';
import messages from 'pl-fe/messages';
import { queryClient } from 'pl-fe/queries/client';
import { getUnreadChatsCount, updateChatListItem } from 'pl-fe/utils/chats';
import { play, soundCache } from 'pl-fe/utils/sounds';

import { updateReactions } from '../announcements/useAnnouncements';

import { useTimelineStream } from './useTimelineStream';

import type { Announcement, AnnouncementReaction, FollowRelationshipUpdate, Relationship, StreamingEvent } from 'pl-api';
import type { AppDispatch, RootState } from 'pl-fe/store';

const updateAnnouncementReactions = ({ announcement_id: id, name }: AnnouncementReaction) => {
  queryClient.setQueryData(['announcements'], (prevResult: Announcement[]) =>
    prevResult.map(value => {
      if (value.id !== id) return value;

      return {
        ...value,
        reactions: updateReactions(value.reactions, name, -1, true),
      };
    }),
  );
};

const updateAnnouncement = (announcement: Announcement) =>
  queryClient.setQueryData(['announcements'], (prevResult: Announcement[]) => {
    let updated = false;

    const result = prevResult.map(value => value.id === announcement.id
      ? (updated = true, announcement)
      : value);

    if (!updated) return [announcement, ...result];
  });

const deleteAnnouncement = (announcementId: string) =>
  queryClient.setQueryData(['announcements'], (prevResult: Announcement[]) =>
    prevResult.filter(value => value.id !== announcementId),
  );

const followStateToRelationship = (followState: FollowRelationshipUpdate['state']) => {
  switch (followState) {
    case 'follow_pending':
      return { following: false, requested: true };
    case 'follow_accept':
      return { following: true, requested: false };
    case 'follow_reject':
      return { following: false, requested: false };
    default:
      return {};
  }
};

const updateFollowRelationships = (update: FollowRelationshipUpdate) =>
  (dispatch: AppDispatch, getState: () => RootState) => {
    const state = getState();

    const me = state.me;
    const relationship = selectEntity<Relationship>(state, Entities.RELATIONSHIPS, update.following.id);

    if (update.follower.id === me && relationship) {
      const updated = {
        ...relationship,
        ...followStateToRelationship(update.state),
      };

      // Add a small delay to deal with API race conditions.
      setTimeout(() => dispatch(importEntities([updated], Entities.RELATIONSHIPS)), 300);
    }
  };

const getTimelineFromStream = (stream: Array<string>) => {
  switch (stream[0]) {
    case 'user':
      return 'home';
    case 'hashtag':
    case 'hashtag:local':
    case 'list':
      return `${stream[0]}:${stream[1]}`;
    default:
      return stream[0];
  }
};

const useUserStream = () => {
  const { isLoggedIn } = useLoggedIn();
  const dispatch = useAppDispatch();
  const statContext = useStatContext();

  const listener = useCallback((event: StreamingEvent) => {
    switch (event.event) {
      case 'update':
        dispatch(processTimelineUpdate(getTimelineFromStream(event.stream), event.payload));
        break;
      case 'status.update':
        dispatch(updateStatus(event.payload));
        break;
      case 'delete':
        dispatch(deleteFromTimelines(event.payload));
        break;
      case 'notification':
        dispatch((dispatch, getState) => {
          const locale = getLocale(getState());
          messages[locale]().then(messages => {
            dispatch(
              updateNotificationsQueue(
                event.payload,
                messages,
                locale,
                window.location.pathname,
              ),
            );
          }).catch(error => {
            console.error(error);
          });
        });
        break;
      case 'conversation':
        dispatch(updateConversations(event.payload));
        break;
      case 'filters_changed':
        dispatch(fetchFilters());
        break;
      case 'chat_update':
        dispatch((_dispatch, getState) => {
          const chat = event.payload;
          const me = getState().me;
          const messageOwned = chat.last_message?.account_id === me;
          const settings = getSettings(getState());

          // Don't update own messages from streaming
          if (!messageOwned) {
            updateChatListItem(chat);

            if (settings.getIn(['chats', 'sound'])) {
              play(soundCache.chat);
            }

            // Increment unread counter
            statContext?.setUnreadChatsCount(getUnreadChatsCount());
          }
        });
        break;
      case 'follow_relationships_update':
        dispatch(updateFollowRelationships(event.payload));
        break;
      case 'announcement':
        updateAnnouncement(event.payload);
        break;
      case 'announcement.reaction':
        updateAnnouncementReactions(event.payload);
        break;
      case 'announcement.delete':
        deleteAnnouncement(event.payload);
        break;
      // case 'marker':
      //   dispatch({ type: MARKER_FETCH_SUCCESS, marker: JSON.parse(data.payload) });
      //   break;
    }
  }, []);

  return useTimelineStream('user', {}, isLoggedIn, listener);
};

export { useUserStream };