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

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

const handlers = {
  "MOVIE_LIST_FETCH_PENDING": state => state.set("loading", true),
  "MOVIE_LIST_FETCH_ERROR": state => state.set("loading", false),
  "MOVIE_LIST_FETCH_FULFILLED": (state, action) => {
    let allMoviesInPolochon = true
    let movies = Map()
    action.payload.response.data.map(function (movie) {
      movie.fetchingDetails = false;
      movie.fetchingSubtitles = false;
      if (movie.polochon_url === "") {
        allMoviesInPolochon = false
      }
      movies = movies.set(movie.imdb_id, fromJS(movie));
    })

    // Select the first movie if the list is not empty
    let selectedImdbId = "";
    if (movies.size > 0) {
      // Sort by year
      movies = movies.sort((a,b) => {
        if (!allMoviesInPolochon) {
          return b.get("year") - a.get("year")
        }

        const dateA = new Date(a.get("date_added"))
        const dateB = new Date(b.get("date_added"))
        return dateA > dateB ? -1 : dateA < dateB ? 1 : 0;
      });

      selectedImdbId = movies.first().get("imdb_id");
    }

    return state.delete("movies").merge(Map({
      movies: movies,
      filter: "",
      loading: false,
      selectedImdbId: selectedImdbId,
    }))
  },
  "MOVIE_GET_DETAILS_PENDING"           : (state, action) => state.setIn(["movies", action.payload.main.imdbId, "fetchingDetails"], true),
  "MOVIE_GET_DETAILS_FULFILLED"         : (state, action) => state.setIn(["movies", action.payload.response.data.imdb_id], fromJS(action.payload.response.data))
                                                                  .setIn(["movies", action.payload.response.data.imdb_id, "fetchingDetails"], false)
                                                                  .setIn(["movies", action.payload.response.data.imdb_id, "fetchingSubtitles"], false),
  "MOVIE_UPDATE_STORE_WISHLIST"         : (state, action) => state.setIn(["movies", action.payload.imdbId, "wishlisted"], action.payload.wishlisted),
  "MOVIE_GET_EXPLORE_OPTIONS_FULFILLED" : (state, action) => state.set("exploreOptions", fromJS(action.payload.response.data)),
  "UPDATE_LAST_MOVIE_FETCH_URL"         : (state, action) => state.set("lastFetchUrl", action.payload.url),
  "MOVIE_SUBTITLES_UPDATE_PENDING"      : (state, action) => state.setIn(["movies", action.payload.main.imdbId, "fetchingSubtitles"], true),
  "MOVIE_SUBTITLES_UPDATE_FULFILLED"    : (state, action) => state.setIn(["movies", action.payload.main.imdbId, "fetchingSubtitles"], false)
                                                                  .setIn(["movies", action.payload.main.imdbId, "subtitles"], fromJS(action.payload.response.data)),
  "SELECT_MOVIE"                        : (state, action) => state.set("selectedImdbId", action.payload.imdbId),
  "MOVIE_UPDATE_FILTER"                 : (state, action) => state.set("filter", action.payload.filter),
}

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