import { OrderedMap, Map, fromJS } from "immutable"

const defaultState = Map({
  loading: false,
  shows: OrderedMap(),
  filter: "",
  selectedImdbId: "",
  lastFetchUrl: "",
  exploreOptions: Map(),
});

const handlers = {
  "SHOW_LIST_FETCH_PENDING": state => state.set("loading", true),
  "SHOW_LIST_FETCH_FULFILLED": (state, action) => {
    let shows = Map();
    action.payload.response.data.map(function (show) {
      show.fetchingDetails = false;
      show.fetchingSubtitles = false;
      shows = shows.set(show.imdb_id, fromJS(show));
    });

    let selectedImdbId = "";
    if (shows.size > 0) {
      // Sort by year
      shows = shows.sort((a,b) => b.get("year") - a.get("year"));
      selectedImdbId = shows.first().get("imdb_id");
    }

    return state.delete("shows").merge(Map({
      shows: shows,
      filter: "",
      loading: false,
      selectedImdbId: selectedImdbId,
    }));
  },
  "SHOW_GET_DETAILS_PENDING": (state, action) => state.setIn(["shows", action.payload.main.imdbId, "fetchingDetails"], true),
  "SHOW_GET_DETAILS_FULFILLED": (state, action) => {
    let show = action.payload.response.data;
    show.fetchingDetails = false;
    show.fetchingSubtitles = false;
    return state.setIn(["shows", show.imdb_id], fromJS(show));
  },
  "SHOW_GET_EXPLORE_OPTIONS_FULFILLED": (state, action) => state.set("exploreOptions", fromJS(action.payload.response.data)),
  "SHOW_UPDATE_STORE_WISHLIST": (state, action) => {
    let season = action.payload.season;
    let episode = action.payload.episode;
    if (action.payload.wishlisted) {
      if (season === null) {
        season = 0;
      }
      if (episode === null) {
        episode = 0;
      }
    }

    return state.mergeIn(["shows", action.payload.imdbId], Map({
      "tracked_season": season,
      "tracked_episode": episode,
    }));
  },
  "UPDATE_LAST_SHOWS_FETCH_URL": (state, action) => state.set("lastFetchUrl", action.payload.url),
  "SELECT_SHOW": (state, action) => state.set("selectedImdbId", action.payload.imdbId),
  "SHOWS_UPDATE_FILTER": (state, action) => state.set("filter", action.payload.filter),
}

export default (state = defaultState, action) =>
  handlers[action.type] ? handlers[action.type](state, action) : state;