reselect.js

import { createSelector } from 'reselect';

const selectMenusDomain = () => (state) => state.get('menus');

const selectRestaurantMenus = () => createSelector(
  selectMenusDomain(),
  (menusState) => menusState.get('menus')
);

const selectActiveMenu = () => createSelector(
  selectMenusDomain(),
  (menusState) => {
    const menus = menusState.get('menus');
    let selectedMenu = null;
    menus.forEach((menu) => {
      if (menu.get('selected', false)) {
        selectedMenu = menu;
      }
      if (menu.get('containersLength') > 0) {
        menu.get('menuContainers').forEach((subMenu) => {
          if (subMenu.get('selected', false)) {
            selectedMenu = subMenu;
          }
        });
      }
    });
    return selectedMenu;
  }
);

const selectMenuItems = () => createSelector(
  selectActiveMenu(),
  (activeMenu) => {
    if (activeMenu) {
      return activeMenu.get('menuItems', List());
    }
    return List();
  }
);

const selectActiveMenuID = () => createSelector(
  selectActiveMenu(),
  (activeMenu) => {
    if (activeMenu) {
      return activeMenu.get('id', -1);
    }
    return -1;
  }
);

const selectActiveMenuItem = () => createSelector(
  selectMenuItems(),
  (menuItems) => (menuItems.filter((menuItem) => (menuItem.get('selected', false))).first() || new Map())
);

const selectActiveMenuItemOptions = () => createSelector(
  selectActiveMenuItem(),
  (menuItem) => (menuItem.get('options') || List())
);

const selectActiveMenuItemVarieties = () => createSelector(
  selectActiveMenuItem(),
  (menuItem) => (menuItem.get('varieties') || List())
);

const selectUpdatingMenu = () => createSelector(
  selectMenusDomain(),
  (menusState) => menusState.get('updatingMenu')
);

const selectDeletingMenu = () => createSelector(
  selectMenusDomain(),
  (menusState) => menusState.get('deletingMenu')
);

export {
  selectRestaurantMenus,
  selectActiveMenu,
  selectMenuItems,
  selectActiveMenuID,
  selectActiveMenuItem,
  selectActiveMenuItemOptions,
  selectActiveMenuItemVarieties,
  selectUpdatingMenu,
  selectDeletingMenu,
};