commerce/components/cart/modal.tsx

'use client';

import { Sheet, SheetContent, SheetHeader, SheetTitle, SheetTrigger } from '@/components/ui/sheet';
import { ShoppingBagIcon } from '@heroicons/react/24/outline';
import Price from 'components/price';
import { DEFAULT_OPTION } from 'lib/constants';
import type { Cart } from 'lib/shopify/types';
import { createUrl } from 'lib/utils';
import { useTranslations } from 'next-intl';
import Link from 'next-intl/link';
import Image from 'next/image';
import { useEffect, useRef, useState } from 'react';
import DeleteItemButton from './delete-item-button';
import EditItemQuantityButton from './edit-item-quantity-button';
import OpenCart from './open-cart';

type MerchandiseSearchParams = {
  [key: string]: string;
};

export default function CartModal({ cart }: { cart: Cart | undefined }) {
  const [isOpen, setIsOpen] = useState(false);
  const quantityRef = useRef(cart?.totalQuantity);
  const t = useTranslations('cart');

  useEffect(() => {
    // Open cart modal when quantity changes.
    if (cart?.totalQuantity !== quantityRef.current) {
      // But only if it's not already open (quantity also changes when editing items in cart).
      if (!isOpen) {
        setIsOpen(true);
      }

      // Always update the quantity reference
      quantityRef.current = cart?.totalQuantity;
    }
  }, [isOpen, cart?.totalQuantity, quantityRef]);

  return (
    <>
      <Sheet open={isOpen} onOpenChange={() => setIsOpen(!isOpen)}>
        <SheetTrigger aria-label={t('openCart')}>
          <OpenCart quantity={cart?.totalQuantity} />
        </SheetTrigger>
        <SheetContent className="bg-app">
          <SheetHeader>
            <SheetTitle className="text-lg font-semibold">{t('myCartTitle')}</SheetTitle>
          </SheetHeader>

          {!cart || cart.lines.length === 0 ? (
            <div className="mt-20 flex w-full flex-col items-center justify-center overflow-hidden">
              <ShoppingBagIcon className="h-12" />
              <p className="mt-6 text-center text-2xl font-bold">{t('empty.title')}</p>
            </div>
          ) : (
            <div className="flex h-full flex-col justify-between overflow-hidden p-1">
              <ul className="flex-grow overflow-auto py-4">
                {cart.lines.map((item, i) => {
                  const merchandiseSearchParams = {} as MerchandiseSearchParams;

                  item.merchandise.selectedOptions.forEach(({ name, value }) => {
                    if (value !== DEFAULT_OPTION) {
                      merchandiseSearchParams[name.toLowerCase()] = value;
                    }
                  });

                  const merchandiseUrl = createUrl(
                    `/product/${item.merchandise.product.handle}`,
                    new URLSearchParams(merchandiseSearchParams)
                  );

                  return (
                    <li key={i} className="flex w-full flex-col border-b border-neutral-300">
                      <div className="relative flex w-full flex-row justify-between px-1 py-4">
                        <div className="absolute z-40 -mt-2 ml-[55px]">
                          <DeleteItemButton item={item} />
                        </div>
                        <Link
                          href={merchandiseUrl}
                          onClick={() => setIsOpen(false)}
                          className="z-30 flex flex-row space-x-4"
                        >
                          <div className="relative h-16 w-16 cursor-pointer">
                            <Image
                              className="h-full w-full object-cover"
                              width={64}
                              height={64}
                              alt={
                                item.merchandise.product.featuredImage.altText ||
                                item.merchandise.product.title
                              }
                              src={item.merchandise.product.featuredImage.url}
                            />
                          </div>

                          <div className="flex flex-1 flex-col text-base">
                            <span className="leading-tight">{item.merchandise.product.title}</span>
                            {item.merchandise.title !== DEFAULT_OPTION ? (
                              <p className="text-sm text-neutral-500 dark:text-neutral-400">
                                {item.merchandise.title}
                              </p>
                            ) : null}
                          </div>
                        </Link>
                        <div className="flex h-16 flex-col justify-between">
                          <Price
                            className="flex justify-end space-y-2 text-right text-sm"
                            amount={item.cost.totalAmount.amount}
                            currencyCode={item.cost.totalAmount.currencyCode}
                          />
                          <div className="ml-auto flex h-9 flex-row items-center rounded-full border border-neutral-200 ">
                            <EditItemQuantityButton item={item} type="minus" />
                            <p className="w-6 text-center">
                              <span className="w-full text-sm">{item.quantity}</span>
                            </p>
                            <EditItemQuantityButton item={item} type="plus" />
                          </div>
                        </div>
                      </div>
                    </li>
                  );
                })}
              </ul>
              <div className="py-4 text-sm text-neutral-500 dark:text-neutral-400">
                <div className="mb-3 flex items-center justify-between border-b border-neutral-200 pb-1 dark:border-neutral-700">
                  <p>Taxes</p>
                  <Price
                    className="text-right text-base text-black dark:text-white"
                    amount={cart.cost.totalTaxAmount.amount}
                    currencyCode={cart.cost.totalTaxAmount.currencyCode}
                  />
                </div>
                <div className="mb-3 flex items-center justify-between border-b border-neutral-200 pb-1 pt-1 dark:border-neutral-700">
                  <p>Shipping</p>
                  <p className="text-right">{t('calculatedAtCheckout')}</p>
                </div>
                <div className="mb-3 flex items-center justify-between border-b border-neutral-200 pb-1 pt-1 dark:border-neutral-700">
                  <p>Total</p>
                  <Price
                    className="text-right text-base text-black dark:text-white"
                    amount={cart.cost.totalAmount.amount}
                    currencyCode={cart.cost.totalAmount.currencyCode}
                  />
                </div>
              </div>
              <a
                href={cart.checkoutUrl}
                className="bg-blue-600 block w-full rounded-full p-3 text-center text-sm font-medium text-white opacity-90 hover:opacity-100"
              >
                {t('proceedToCheckout')}
              </a>
            </div>
          )}

          <div className="mt-4 flex flex-col">
            <h2 className="font-bold">Line item examples</h2>
            <ul>
              <li className="flex w-full flex-col border-b border-neutral-300">
                <div className="relative flex w-full flex-row justify-between px-1 py-4">
                  <Link
                    href={'/'}
                    onClick={() => setIsOpen(false)}
                    className="z-30 flex flex-row space-x-4"
                  >
                    <div className="relative h-16 w-16 cursor-pointer border-neutral-300 bg-neutral-300 "></div>

                    <div className="flex flex-1 flex-col text-base">
                      <span className="leading-tight">Product title</span>
                      <p className="text-sm text-neutral-500 ">Option of product</p>
                    </div>
                  </Link>
                  <div className="flex h-16 flex-col justify-between">
                    <Price
                      className="flex justify-end space-y-2 text-right text-sm"
                      amount={'100'}
                      currencyCode={'SEK'}
                    />
                  </div>
                </div>
              </li>
              <li className="flex w-full flex-col border-b border-neutral-300">
                <div className="relative flex w-full flex-row justify-between px-1 py-4">
                  <Link
                    href={'/'}
                    onClick={() => setIsOpen(false)}
                    className="z-30 flex flex-row space-x-4"
                  >
                    <div className="relative h-16 w-16 cursor-pointer border-neutral-300 bg-neutral-300 "></div>

                    <div className="flex flex-1 flex-col text-base">
                      <span className="leading-tight">Product title</span>
                      <p className="text-sm text-neutral-500 ">Option of product</p>
                    </div>
                  </Link>
                  <div className="flex h-16 flex-col justify-between">
                    <Price
                      className="flex justify-end space-y-2 text-right text-sm"
                      amount={'100'}
                      currencyCode={'SEK'}
                    />
                  </div>
                </div>
              </li>
            </ul>
          </div>
        </SheetContent>
      </Sheet>
    </>
  );
}