iid-homework/src/store/shoppingList.ts

import { defineStore } from 'pinia';
import { dummyList, users } from './dummyData';

type User = {
  name: string;
};

type ShoppingItem = {
  name: string;
  price: number;
  isBought: boolean;
  user: User;
};

export const useShoppingListStore = defineStore('shoppingList', {
  state() {
    return {
      items: dummyList as Array<ShoppingItem>,
      users: users as Array<User>,
    };
  },
  actions: {},
  getters: {
    openItems: state => state.items.filter(item => !item.isBought),
    boughtItems: state => state.items.filter(item => !!item.isBought),
    itemsByUser: state => groupItemsByUser(state.items),
    openItemsByUser: state => groupItemsByUser(state.items.filter(item => !item.isBought)),
    boughtItemsByUser: state => groupItemsByUser(state.items.filter(item => !!item.isBought)),
  },
});

export const groupItemsByUser = items => items.reduce((groups, item) => {
  if (!groups[item.user.name]) groups[item.user.name] = [];
  groups[item.user.name].push(item);
  return groups;
}, {});