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;