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import { property, flow, set, mergeWith, isString } from 'lodash/fp';

const createPathLense = path => ({
  select: property(path),
  update: (state, value) => set(path, value, state),
});

export const createModuleFactory = (
  selectors,
  reducer = selectors,
) => (lense) => {
  const { select, update } = isString(lense) ? createPathLense(lense) : lense;

  const reduce = (state, action) => {
    const cursor = select(state, action);
    const newStateAtCursor = reducer(cursor, action);
    if (newStateAtCursor === cursor) {
      return state;
    }

    return update(state, newStateAtCursor);
  };

  selectors = mergeWith( //eslint-disable-line
    selector => flow(select, selector), {}, selectors,
  );

  return Object.assign(reduce, selectors);
};