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

import {
  PINNED_ACCOUNTS_EDITOR_RESET,
  PINNED_ACCOUNTS_FETCH_REQUEST,
  PINNED_ACCOUNTS_FETCH_SUCCESS,
  PINNED_ACCOUNTS_FETCH_FAIL,
  PINNED_ACCOUNTS_SUGGESTIONS_FETCH_SUCCESS,
  PINNED_ACCOUNTS_EDITOR_SUGGESTIONS_CLEAR,
  PINNED_ACCOUNTS_EDITOR_SUGGESTIONS_CHANGE,
  ACCOUNT_PIN_SUCCESS,
  ACCOUNT_UNPIN_SUCCESS,
} from "../actions/accounts";

const initialState = ImmutableMap({
  accounts: ImmutableMap({
    items: ImmutableList(),
    loaded: false,
    isLoading: false,
  }),

  suggestions: ImmutableMap({
    value: "",
    items: ImmutableList(),
  }),
});

export default function listEditorReducer(state = initialState, action) {
  switch(action.type) {
    case PINNED_ACCOUNTS_EDITOR_RESET:
      return initialState;
    case PINNED_ACCOUNTS_FETCH_REQUEST:
      return state.setIn(["accounts", "isLoading"], true);
    case PINNED_ACCOUNTS_FETCH_FAIL:
      return state.setIn(["accounts", "isLoading"], false);
    case PINNED_ACCOUNTS_FETCH_SUCCESS:
      return state.update("accounts", accounts => accounts.withMutations(map => {
        map.set("isLoading", false);
        map.set("loaded", true);
        map.set("items", ImmutableList(action.accounts.map(item => item.id)));
      }));
    case PINNED_ACCOUNTS_SUGGESTIONS_FETCH_SUCCESS:
      return state.setIn(["suggestions", "items"], ImmutableList(action.accounts.map(item => item.id)));
    case PINNED_ACCOUNTS_EDITOR_SUGGESTIONS_CHANGE:
      return state.setIn(["suggestions", "value"], action.value);
    case PINNED_ACCOUNTS_EDITOR_SUGGESTIONS_CLEAR:
      return state.update("suggestions", suggestions => suggestions.withMutations(map => {
        map.set("items", ImmutableList());
        map.set("value", "");
      }));
    case ACCOUNT_PIN_SUCCESS:
      return state.updateIn(["accounts", "items"], list => list.unshift(action.relationship.id));
    case ACCOUNT_UNPIN_SUCCESS:
      return state.updateIn(["accounts", "items"], list => list.filterNot(item => item === action.relationship.id));
    default:
      return state;
  }
}