postshop-frontend/app/[locale]/cart/page.tsx

"use client"
import { useState, useEffect } from "react"
import { Card } from "@/components/ui/card"
import { Separator } from "@/components/ui/separator"
import CartItemCard from "./ui/CartItemCard"
import OrderSummary from "./ui/OrderSummary"
import { useCart, useCreateOrder, useRegions, useAddresses, usePaymentTypes } from "@/lib/hooks"
import { useTranslations } from "next-intl"
import { useRouter } from "next/navigation"
import type { DeliveryType, PaymentTypeOption } from "./ui/types"

export default function CartPage() {
  const [isClient, setIsClient] = useState(false)
  const [paymentType, setPaymentType] = useState<PaymentTypeOption | null>(null)
  const [deliveryType, setDeliveryType] = useState<DeliveryType>("SELECTED_DELIVERY")
  const [selectedRegion, setSelectedRegion] = useState<string | null>(null)
  const [selectedAddress, setSelectedAddress] = useState<string>("")
  const [note, setNote] = useState<string>("")
  const router = useRouter()

  const t = useTranslations()

  const { data: cart, isLoading, isError } = useCart()
  const { data: regions = [] } = useRegions()
  const { data: addresses = [] } = useAddresses()
  const { data: paymentTypes = [] } = usePaymentTypes()
  const { mutate: createOrder, isPending: isCreatingOrder } = useCreateOrder()

  useEffect(() => {
    setIsClient(true)
  }, [])

  const handleDeliveryTypeChange = (type: DeliveryType) => {
    setDeliveryType(type)
    setSelectedAddress("")
  }

  const handleCompleteOrder = () => {
    if (!selectedRegion || !selectedAddress || !paymentType) {
      console.warn("[v0] Missing required fields for order")
      return
    }

    const selectedRegionObj = regions.find((r) => r.code === selectedRegion)

    createOrder(
      {
        customer_address: selectedAddress,
        shipping_method: deliveryType === "PICK_UP" ? "pickup" : "standart",
        payment_type_id: paymentType.id,
        region: selectedRegion,
        note: note || undefined,
      },
      {
        onSuccess: () => {
          // Navigate to orders page after successful order creation
          router.push(`/orders`)
        },
      },
    )
  }

  if (!isClient) return null

  if (isLoading) {
    return (
      <div className="container mx-auto px-4 min-h-[90vh] flex items-center justify-center">
        <p>{t("loading")}</p>
      </div>
    )
  }

  if (isError || !cart?.items || cart.items.length === 0) {
    return (
      <div className="container mx-auto px-4 min-h-[90vh] flex items-center justify-center">
        <h2 className="text-3xl md:text-4xl lg:text-5xl text-gray-400 font-semibold">
          {t("emptyCart") || "Your cart is empty"}
        </h2>
      </div>
    )
  }

  const translations = {
    cart: t("cart"),
    ordersIn: t("order_available_in_shops"),
    pricePerUnit: t("unit_price"),
    additionalPrice: t("extra_price"),
    discount: t("discount"),
    totalPrice: t("total_price"),
    paymentType: t("payment_type"),
    cash: t("cash"),
    card: t("card"),
    deliveryType: t("delivery_type"),
    delivery: t("delivery"),
    pickup: t("pickup"),
    selectRegion: t("choose_region"),
    selectAddress: t("choose_address"),
    note: t("note"),
    placeOrder: t("order"),
    emptyCart: t("cart_empty"),
    map: t("address"),
  }

  const itemsBySeller = cart.items.reduce(
    (acc, item) => {
      const sellerId = item.seller.id
      if (!acc[sellerId]) {
        acc[sellerId] = { seller: item.seller, items: [] }
      }
      acc[sellerId].items.push(item)
      return acc
    },
    {} as Record<number, { seller: any; items: typeof cart.items }>,
  )

  return (
    <div className="container mx-auto px-4 py-8 min-h-screen">
      <h1 className="text-3xl font-bold mb-6">{translations.cart}</h1>

      <div className="flex flex-col md:flex-row gap-6">
        {/* Cart Items Section */}
        <div className="flex-1">
          <Card className="p-6 rounded-xl">
            {/* Sellers */}
            {Object.entries(itemsBySeller).map(([sellerId, { seller, items }]) => (
              <div key={sellerId} className="mb-6">
                <p className="text-base font-semibold mb-3">{seller.name}</p>
                <div className="space-y-4">
                  {items.map((item) => (
                    <CartItemCard key={item.id} item={item} translations={translations} />
                  ))}
                </div>
                {Object.entries(itemsBySeller).length > 1 && <Separator className="mt-4" />}
              </div>
            ))}
          </Card>
        </div>

        {/* Order Summary Sidebar */}
        <OrderSummary
          order={{
            id: 1,
            seller: { id: 1, name: "Store" },
            items: cart.items,
            billing: {
              body: [{ title: t("goods"), value: `${cart.total_formatted || `${cart.total} TMT`}` }],
              footer: { title: t("total"), value: `${cart.total_formatted || `${cart.total} TMT`}` },
            },
          }}
          translations={translations}
          paymentType={paymentType}
          deliveryType={deliveryType}
          selectedRegion={selectedRegion}
          selectedAddress={selectedAddress}
          note={note}
          regions={regions}
          addresses={addresses}
          paymentTypes={paymentTypes}
          onPaymentTypeChange={setPaymentType}
          onDeliveryTypeChange={handleDeliveryTypeChange}
          onRegionChange={setSelectedRegion}
          onAddressChange={setSelectedAddress}
          onNoteChange={setNote}
          onMapOpen={() => {}}
          onCompleteOrder={handleCompleteOrder}
          isLoading={isCreatingOrder}
        />
      </div>
    </div>
  )
}