soapbox/src/reducers/tags.ts

import { Map as ImmutableMap } from 'immutable';

import {
  HASHTAG_FETCH_SUCCESS,
  HASHTAG_FOLLOW_REQUEST,
  HASHTAG_FOLLOW_FAIL,
  HASHTAG_UNFOLLOW_REQUEST,
  HASHTAG_UNFOLLOW_FAIL,
} from 'soapbox/actions/tags';
import { normalizeTag } from 'soapbox/normalizers';

import type { AnyAction } from 'redux';
import type { Tag } from 'soapbox/types/entities';

const initialState = ImmutableMap<string, Tag>();

export default function tags(state = initialState, action: AnyAction) {
  switch (action.type) {
    case HASHTAG_FETCH_SUCCESS:
      return state.set(action.name, normalizeTag(action.tag));
    case HASHTAG_FOLLOW_REQUEST:
    case HASHTAG_UNFOLLOW_FAIL:
      return state.setIn([action.name, 'following'], true);
    case HASHTAG_FOLLOW_FAIL:
    case HASHTAG_UNFOLLOW_REQUEST:
      return state.setIn([action.name, 'following'], false);
    default:
      return state;
  }
}