'use client';

import { Dialog, Transition } from '@headlessui/react';
import { ShoppingBagIcon } from '@heroicons/react/24/outline';
import { useAgeConfirmation } from 'app/hooks/use-age-confirmation';
import Price from 'components/price';
import AgeGateForm from 'components/product/age-gate-form';
import { DEFAULT_OPTION } from 'lib/constants';
import type { Cart, Product } from 'lib/shopify/types';
import { createUrl } from 'lib/utils';
import { useTranslations } from 'next-intl';
import Image from 'next/image';
import Link from 'next/link';
import { Fragment, useEffect, useRef, useState } from 'react';
import CloseCart from './close-cart';
import DeleteItemButton from './delete-item-button';
import EditItemQuantityButton from './edit-item-quantity-button';
import OpenCart from './open-cart';
import { PromotedCartItem } from './promoted-cart-item';

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

export default function CartModal({
  cart,
  promotedItem
}: {
  cart: Cart | undefined;
  promotedItem?: Product;
}) {
  const t = useTranslations('Index');
  const [isOpen, setIsOpen] = useState<boolean>(false);
  const [isConfirming, setIsConfirming] = useState<boolean>(false);
  const { ageConfirmed } = useAgeConfirmation();

  const quantityRef = useRef(cart?.totalQuantity);
  const openCart = () => setIsOpen(true);
  const closeCart = () => setIsOpen(false);

  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;
    }

    return () => {
      setIsConfirming(false);
    };
  }, [isOpen, cart?.totalQuantity, quantityRef]);

  const checkoutWithAgeCheck = () => {
    setIsOpen(true);
    setIsConfirming(true);
  };

  return (
    <>
      <div>
        <button aria-label="Open cart" onClick={openCart} className="w-20">
          <OpenCart quantity={cart?.totalQuantity} />
        </button>
        <Transition show={isOpen}>
          <Dialog onClose={closeCart} className="relative z-50 w-0">
            <Transition.Child
              as={Fragment}
              enter="transition-all ease-in-out duration-300"
              enterFrom="opacity-0 backdrop-blur-none"
              enterTo="opacity-100 backdrop-blur-[.5px]"
              leave="transition-all ease-in-out duration-200"
              leaveFrom="opacity-100 backdrop-blur-[.5px]"
              leaveTo="opacity-0 backdrop-blur-none"
            >
              <div className="fixed inset-0 bg-black/30" aria-hidden="true" />
            </Transition.Child>
            <Transition.Child
              as={Fragment}
              enter="transition-all ease-in-out duration-300"
              enterFrom="translate-x-full"
              enterTo="translate-x-0"
              leave="transition-all ease-in-out duration-200"
              leaveFrom="translate-x-0"
              leaveTo="translate-x-full"
            >
              <Dialog.Panel className="fixed inset-y-0 right-0 flex h-full w-full flex-col border-l border-white/20 bg-dark p-6 font-sans text-white backdrop-blur-xl md:w-[390px]">
                <div className="flex items-center justify-between">
                  <p className="text-lg font-semibold">Cart</p>

                  <button aria-label="Close cart" onClick={closeCart}>
                    <CloseCart />
                  </button>
                </div>

                {!!isConfirming && !!cart && cart?.checkoutUrl ? (
                  <div className="animate-fadeIn">
                    <AgeGateForm
                      didCancel={() => setIsConfirming(false)}
                      checkoutUrl={cart.checkoutUrl}
                    />
                  </div>
                ) : (
                  <>
                    {!cart || cart.lines.length === 0 ? (
                      <div className="mt-20 flex w-full flex-col items-center justify-center overflow-hidden">
                        <ShoppingBagIcon className="h-16" strokeWidth={1} />
                        <p className="mt-6 text-center font-serif text-xl">
                          Your shopping bag is empty.
                        </p>
                      </div>
                    ) : (
                      <div className="flex h-full flex-col justify-between overflow-hidden p-1">
                        <ul className="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-white/20">
                                <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={closeCart}
                                    className="z-30 flex flex-row space-x-4"
                                  >
                                    <div className="relative h-16 w-16 cursor-pointer overflow-hidden rounded-md border border-white/20 bg-white/40">
                                      <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-white">
                                          {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-white/20">
                                      <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>
                        {!!promotedItem && (
                          <PromotedCartItem
                            product={promotedItem}
                            availableForSale={promotedItem.availableForSale}
                          />
                        )}
                        <div className="pb-4 pt-12 text-sm text-neutral-500 dark:text-neutral-400">
                          <div className="mb-3 flex items-center justify-between border-b border-white/20 pb-1">
                            <p>Taxes</p>
                            <p className="text-right text-white/50">Calculated at checkout</p>
                          </div>
                          <div className="mb-3 flex items-center justify-between border-b border-white/20 py-1">
                            <p>Shipping</p>
                            <p className="text-right text-white/50">Calculated at checkout</p>
                          </div>
                          <div className="mb-3 flex items-center justify-between border-b border-white/20 py-1">
                            <p>Total</p>
                            <Price
                              className="text-right text-base text-white"
                              amount={cart.cost.totalAmount.amount}
                              currencyCode={cart.cost.totalAmount.currencyCode}
                            />
                          </div>
                        </div>
                        {ageConfirmed ? (
                          <>
                            <Link
                              href={cart.checkoutUrl}
                              className="block w-full border border-white/20 bg-dark px-12 py-6 text-center font-sans font-medium uppercase tracking-wider text-white transition-colors duration-300 hover:bg-white hover:text-black"
                            >
                              {t('cart.proceed')}
                            </Link>
                          </>
                        ) : (
                          <>
                            <button
                              type="button"
                              onClick={() => checkoutWithAgeCheck()}
                              className="block w-full border border-white/20 bg-dark px-12 py-6 text-center font-sans font-medium uppercase tracking-wider text-white transition-colors duration-300 hover:bg-white hover:text-black"
                            >
                              {t('cart.proceed')}
                            </button>
                          </>
                        )}
                      </div>
                    )}
                  </>
                )}
              </Dialog.Panel>
            </Transition.Child>
          </Dialog>
        </Transition>
      </div>
    </>
  );
}