import { without } from "es-toolkit";

export default function useActiveCart({ carts, cartItems, customers }) {
  const activeCartId = ref();

  const activeCart = computed(() => carts.value.find((c) => c.id === activeCartId.value));
  const activeCartItems = computed(() => cartItems.value.filter((ci) => ci.cart === activeCartId.value));

  watch(
    carts,
    (newVal) => {
      if (!activeCartId.value && newVal.length) {
        activeCartId.value = newVal[0].id;
      }
    },
    { immediate: true },
  );

  const customerIdsWithNoCart = computed(() => {
    const cusIds = customers.value.map((c) => c.id);
    const cusIdsWithCart = carts.value.filter((c) => c.customer).map((c) => c.customer);
    const cusIdsWithNoCart = without(cusIds, ...cusIdsWithCart);
    return cusIdsWithNoCart;
  });

  const subtotal = computed(() => {
    return activeCartItems.value?.reduce((prev, curr) => prev + curr.imei__variant__price, 0);
  });

  return { activeCartId, activeCart, activeCartItems, customerIdsWithNoCart, subtotal };
}