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

import {
  LIST_ADDER_RESET,
  LIST_ADDER_SETUP,
  LIST_ADDER_LISTS_FETCH_REQUEST,
  LIST_ADDER_LISTS_FETCH_SUCCESS,
  LIST_ADDER_LISTS_FETCH_FAIL,
  LIST_EDITOR_ADD_SUCCESS,
  LIST_EDITOR_REMOVE_SUCCESS,
} from "../actions/lists";

const initialState = ImmutableMap({
  accountId: null,

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

export default function listAdderReducer(state = initialState, action) {
  switch(action.type) {
    case LIST_ADDER_RESET:
      return initialState;
    case LIST_ADDER_SETUP:
      return state.withMutations(map => {
        map.set("accountId", action.account.get("id"));
      });
    case LIST_ADDER_LISTS_FETCH_REQUEST:
      return state.setIn(["lists", "isLoading"], true);
    case LIST_ADDER_LISTS_FETCH_FAIL:
      return state.setIn(["lists", "isLoading"], false);
    case LIST_ADDER_LISTS_FETCH_SUCCESS:
      return state.update("lists", lists => lists.withMutations(map => {
        map.set("isLoading", false);
        map.set("loaded", true);
        map.set("items", ImmutableList(action.lists.map(item => item.id)));
      }));
    case LIST_EDITOR_ADD_SUCCESS:
      return state.updateIn(["lists", "items"], list => list.unshift(action.listId));
    case LIST_EDITOR_REMOVE_SUCCESS:
      return state.updateIn(["lists", "items"], list => list.filterNot(item => item === action.listId));
    default:
      return state;
  }
}