'use client';

import { useState } from 'react';

import { formatCurrency } from '@/packages/shared/src/utils';
import { StoreCart, StoreCartLineItem } from '@medusajs/types';
import { Loader2 } from 'lucide-react';
import { useTranslation } from 'react-i18next';

import { Button } from '@kit/ui/button';
import { Card, CardContent, CardHeader } from '@kit/ui/card';
import { Trans } from '@kit/ui/trans';

import AnalysisLocation from './analysis-location';
import CartItems from './cart-items';
import CartServiceItems from './cart-service-items';
import DiscountCode from './discount-code';
import { initiatePayment } from '../../_lib/server/cart-actions';
import { useRouter } from 'next/navigation';
import { AccountBalanceSummary } from '@kit/accounts/services/account-balance.service';
import { EnrichedCartItem } from './types';

const IS_DISCOUNT_SHOWN = true as boolean;

export default function Cart({
  accountId,
  cart,
  synlabAnalyses,
  ttoServiceItems,
  balanceSummary,
}: {
  accountId: string;
  cart: StoreCart | null;
  synlabAnalyses: StoreCartLineItem[];
  ttoServiceItems: EnrichedCartItem[];
  balanceSummary: AccountBalanceSummary | null;
}) {
  const {
    i18n: { language },
  } = useTranslation();

  const [isInitiatingSession, setIsInitiatingSession] = useState(false);
  const router = useRouter();
  const [unavailableLineItemIds, setUnavailableLineItemIds] =
    useState<string[]>();

  const items = cart?.items ?? [];
  const hasCartItems = cart && Array.isArray(items) && items.length > 0;

  if (!hasCartItems) {
    return (
      <div className="content-container py-5 lg:px-4">
        <div>
          <div
            className="flex flex-col items-center justify-center"
            data-testid="empty-cart-message"
          >
            <h4 className="text-center">
              <Trans i18nKey="cart:emptyCartMessage" />
            </h4>
            <p className="text-center">
              <Trans i18nKey="cart:emptyCartMessageDescription" />
            </p>
          </div>
        </div>
      </div>
    );
  }

  async function initiateSession() {
    setIsInitiatingSession(true);

    try {
      const { url, isFullyPaidByBenefits, orderId, unavailableLineItemIds } = await initiatePayment({
        accountId,
        balanceSummary: balanceSummary!,
        cart: cart!,
        language,
      });
      if (unavailableLineItemIds) {
        setUnavailableLineItemIds(unavailableLineItemIds);
      }
      if (url) {
        window.location.href = url;
      } else if (isFullyPaidByBenefits) {
        if (typeof orderId !== 'number') {
          throw new Error('Order ID is missing');
        }
        router.push(`/home/order/${orderId}/confirmed`);
      }
    } catch (error) {
      console.error('Failed to initiate payment', error);
      setIsInitiatingSession(false);
    }
  }

  const isLocationsShown = synlabAnalyses.length > 0;

  const companyBenefitsTotal = balanceSummary?.totalBalance ?? 0;
  const montonioTotal = cart && companyBenefitsTotal > 0 ? cart.total - companyBenefitsTotal : cart.total;

  return (
    <div className="small:grid-cols-[1fr_360px] grid grid-cols-1 gap-x-40 lg:px-4">
      <div className="flex flex-col gap-y-6 bg-white">
        <CartItems
          cart={cart}
          items={synlabAnalyses}
          productColumnLabelKey="cart:items.synlabAnalyses.productColumnLabel"
        />
        <CartServiceItems
          cart={cart}
          items={ttoServiceItems}
          productColumnLabelKey="cart:items.ttoServices.productColumnLabel"
          unavailableLineItemIds={unavailableLineItemIds}
        />
      </div>
      {hasCartItems && (
        <>
          <div className="flex gap-x-4 px-4 pt-2 sm:justify-end sm:px-6 sm:pt-4">
            <div className="w-full sm:mr-[42px] sm:w-auto">
              <p className="text-muted-foreground ml-0 text-sm font-bold">
                <Trans i18nKey="cart:order.subtotal" />
              </p>
            </div>
            <div className={`sm:mr-[112px] sm:w-[50px]`}>
              <p className="text-right text-sm">
                {formatCurrency({
                  value: cart.subtotal,
                  currencyCode: cart.currency_code,
                  locale: language,
                })}
              </p>
            </div>
          </div>
          <div className="flex gap-x-4 px-4 pt-2 sm:justify-end sm:px-6 sm:pt-4">
            <div className="w-full sm:mr-[42px] sm:w-auto">
              <p className="text-muted-foreground ml-0 text-sm font-bold">
                <Trans i18nKey="cart:order.promotionsTotal" />
              </p>
            </div>
            <div className={`sm:mr-[112px] sm:w-[50px]`}>
              <p className="text-right text-sm">
                {formatCurrency({
                  value: cart.discount_total,
                  currencyCode: cart.currency_code,
                  locale: language,
                })}
              </p>
            </div>
          </div>
          {companyBenefitsTotal > 0 && (
            <div className="flex gap-x-4 px-4 py-2 sm:justify-end sm:px-6 sm:py-4">
              <div className="w-full sm:mr-[42px] sm:w-auto">
                <p className="text-muted-foreground ml-0 text-sm font-bold">
                  <Trans i18nKey="cart:order.companyBenefitsTotal" />
                </p>
              </div>
              <div className={`sm:mr-[112px] sm:w-[50px]`}>
                <p className="text-right text-sm">
                  {formatCurrency({
                    value: (companyBenefitsTotal > cart.total ? cart.total : companyBenefitsTotal),
                    currencyCode: cart.currency_code,
                    locale: language,
                  })}
                </p>
              </div>
            </div>
          )}
          <div className="flex gap-x-4 px-4 sm:justify-end sm:px-6">
            <div className="w-full sm:mr-[42px] sm:w-auto">
              <p className="ml-0 text-sm font-bold">
                <Trans i18nKey="cart:order.total" />
              </p>
            </div>
            <div className={`sm:mr-[112px] sm:w-[50px]`}>
              <p className="text-right text-sm">
                {formatCurrency({
                  value: montonioTotal < 0 ? 0 : montonioTotal,
                  currencyCode: cart.currency_code,
                  locale: language,
                })}
              </p>
            </div>
          </div>
        </>
      )}

      <div className="flex flex-col gap-x-4 gap-y-6 py-4 sm:flex-row sm:py-8">
        {IS_DISCOUNT_SHOWN && (
          <Card className="flex w-full flex-col justify-between sm:w-1/2">
            <CardHeader className="pb-4">
              <h5>
                <Trans i18nKey="cart:discountCode.title" />
              </h5>
            </CardHeader>
            <CardContent className="h-full">
              <DiscountCode cart={{ ...cart }} />
            </CardContent>
          </Card>
        )}

        {isLocationsShown && (
          <Card className="flex w-full flex-col justify-between sm:w-1/2">
            <CardHeader className="pb-4">
              <h5>
                <Trans i18nKey="cart:locations.title" />
              </h5>
            </CardHeader>
            <CardContent className="h-full">
              <AnalysisLocation
                cart={{ ...cart }}
                synlabAnalyses={synlabAnalyses}
              />
            </CardContent>
          </Card>
        )}
      </div>

      <div>
        <Button
          className="h-10"
          onClick={initiateSession}
          disabled={isInitiatingSession}
        >
          {isInitiatingSession && (
            <Loader2 className="mr-2 h-4 w-4 animate-spin" />
          )}
          <Trans i18nKey="cart:checkout.goToCheckout" />
        </Button>
      </div>
    </div>
  );
}