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;