export function provideInitialState()

in src/reducers/root.js [31:96]
55 lines of code
5 McCabe index (conditional complexity)

export function provideInitialState(initialState) {
  const coreReducer = coreReducerFactory(initialState);

  const handleRegisterEntry = (
    state,
    {
      payload: {
        id,
        mint,
        mapboxApiAccessToken,
        mapboxApiUrl,
        mapStylesReplaceDefault,
        initialUiState
      }
    }
  ) => {
    // by default, always create a mint state even if the same id already exist
    // if state.id exist and mint=false, keep the existing state
    const previousState = state[id] && mint === false ? state[id] : undefined;

    return {
      // register entry to kepler.gl passing in mapbox config to mapStyle
      ...state,
      [id]: coreReducer(
        previousState,
        keplerGlInit({mapboxApiAccessToken, mapboxApiUrl, mapStylesReplaceDefault, initialUiState})
      )
    };
  };

  const handleDeleteEntry = (state, {payload: id}) =>
    Object.keys(state).reduce(
      (accu, curr) => ({
        ...accu,
        ...(curr === id ? {} : {[curr]: state[curr]})
      }),
      {}
    );

  const handleRenameEntry = (state, {payload: {oldId, newId}}) =>
    Object.keys(state).reduce(
      (accu, curr) => ({
        ...accu,
        ...{[curr === oldId ? newId : curr]: state[curr]}
      }),
      {}
    );

  return (state = initialCoreState, action) => {
    // update child states
    Object.keys(state).forEach(id => {
      const updateItemState = coreReducer(state[id], _actionFor(id, action));
      state = _updateProperty(state, id, updateItemState);
    });

    // perform additional state reducing (e.g. switch action.type etc...)
    return handleActions(
      {
        [ActionTypes.REGISTER_ENTRY]: handleRegisterEntry,
        [ActionTypes.DELETE_ENTRY]: handleDeleteEntry,
        [ActionTypes.RENAME_ENTRY]: handleRenameEntry
      },
      initialCoreState
    )(state, action);
  };
}