import { Map as ImmutableMap, List as ImmutableList, fromJS } from "immutable";

import {
  TRENDS_TAGS_FETCH_REQUEST,
  TRENDS_TAGS_FETCH_SUCCESS,
  TRENDS_TAGS_FETCH_FAIL,
  TRENDS_LINKS_FETCH_REQUEST,
  TRENDS_LINKS_FETCH_SUCCESS,
  TRENDS_LINKS_FETCH_FAIL,
} from "mastodon/actions/trends";

const initialState = ImmutableMap({
  tags: ImmutableMap({
    items: ImmutableList(),
    isLoading: false,
  }),

  links: ImmutableMap({
    items: ImmutableList(),
    isLoading: false,
  }),
});

export default function trendsReducer(state = initialState, action) {
  switch(action.type) {
    case TRENDS_TAGS_FETCH_REQUEST:
      return state.setIn(["tags", "isLoading"], true);
    case TRENDS_TAGS_FETCH_SUCCESS:
      return state.withMutations(map => {
        map.setIn(["tags", "items"], fromJS(action.trends));
        map.setIn(["tags", "isLoading"], false);
      });
    case TRENDS_TAGS_FETCH_FAIL:
      return state.setIn(["tags", "isLoading"], false);
    case TRENDS_LINKS_FETCH_REQUEST:
      return state.setIn(["links", "isLoading"], true);
    case TRENDS_LINKS_FETCH_SUCCESS:
      return state.withMutations(map => {
        map.setIn(["links", "items"], fromJS(action.trends));
        map.setIn(["links", "isLoading"], false);
      });
    case TRENDS_LINKS_FETCH_FAIL:
      return state.setIn(["links", "isLoading"], false);
    default:
      return state;
  }
}