first commit

features/cart/components/CartItemCard.tsx

@@ -0,0 +1,458 @@
+"use client";
+import { useState, useEffect, useRef, useCallback } from "react";
+import Image from "next/image";
+import { Minus, Plus, Trash2, AlertTriangle } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { Card } from "@/components/ui/card";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { useUpdateCartItemQuantity, useRemoveFromCart } from "@/lib/hooks";
+import { useTranslations } from "next-intl";
+import type { CartItem } from "@/lib/types/api";
+
+interface CartItemCardProps {
+  item: CartItem;
+  onUpdate?: () => void;
+}
+
+// Session Storage Key
+const PENDING_CART_UPDATES_KEY = "pendingCartUpdates";
+
+interface PendingUpdate {
+  quantity: number;
+  timestamp: number;
+  retryCount: number;
+}
+
+export default function CartItemCard({ item, onUpdate }: CartItemCardProps) {
+  const t = useTranslations();
+
+  // Local UI State (Instant feedback)
+  const [localQuantity, setLocalQuantity] = useState(item.quantity);
+
+  // Sync State
+  const [isSyncing, setIsSyncing] = useState(false);
+  const [syncError, setSyncError] = useState(false);
+
+  // Stock limit modal
+  const [showStockModal, setShowStockModal] = useState(false);
+
+  // Refs
+  const debounceTimerRef = useRef<NodeJS.Timeout | undefined>(undefined);
+  const isRequestInFlightRef = useRef(false);
+  const pendingQuantityRef = useRef<number | null>(null);
+  const retryCountRef = useRef(0);
+  const retryTimerRef = useRef<NodeJS.Timeout | undefined>(undefined);
+
+  // Function refs to solve circular dependency
+  const syncToServerRef = useRef<((quantity: number) => void) | null>(null);
+  const retrySyncRef = useRef<((quantity: number) => void) | null>(null);
+
+  const { mutate: updateQuantity } = useUpdateCartItemQuantity();
+  const { mutate: removeItem, isPending: isRemoving } = useRemoveFromCart();
+
+  // Get available stock
+  const availableStock = item.product.stock || 0;
+
+  // Initialize from server state
+  useEffect(() => {
+    setLocalQuantity(item.quantity);
+  }, [item.quantity]);
+
+  // Save to sessionStorage
+  const savePendingUpdate = useCallback(
+    (quantity: number) => {
+      try {
+        const stored = sessionStorage.getItem(PENDING_CART_UPDATES_KEY);
+        const pending: Record<number, PendingUpdate> = stored
+          ? JSON.parse(stored)
+          : {};
+
+        pending[item.product_id] = {
+          quantity,
+          timestamp: Date.now(),
+          retryCount: retryCountRef.current,
+        };
+
+        sessionStorage.setItem(
+          PENDING_CART_UPDATES_KEY,
+          JSON.stringify(pending)
+        );
+      } catch (error) {
+        console.error("Failed to save pending update:", error);
+      }
+    },
+    [item.product_id]
+  );
+
+  // Remove from sessionStorage
+  const clearPendingUpdate = useCallback(() => {
+    try {
+      const stored = sessionStorage.getItem(PENDING_CART_UPDATES_KEY);
+      if (stored) {
+        const pending: Record<number, PendingUpdate> = JSON.parse(stored);
+        delete pending[item.product_id];
+
+        if (Object.keys(pending).length === 0) {
+          sessionStorage.removeItem(PENDING_CART_UPDATES_KEY);
+        } else {
+          sessionStorage.setItem(
+            PENDING_CART_UPDATES_KEY,
+            JSON.stringify(pending)
+          );
+        }
+      }
+    } catch (error) {
+      console.error("Failed to clear pending update:", error);
+    }
+  }, [item.product_id]);
+
+  // Exponential backoff retry
+  const retrySync = useCallback((quantity: number) => {
+    const maxRetries = 4;
+    const retryCount = retryCountRef.current;
+
+    if (retryCount >= maxRetries) {
+      setSyncError(true);
+      setIsSyncing(false);
+      return;
+    }
+
+    const delay = Math.min(1000 * Math.pow(2, retryCount), 16000); // Max 16s
+    retryCountRef.current++;
+
+    retryTimerRef.current = setTimeout(() => {
+      syncToServerRef.current?.(quantity);
+    }, delay);
+  }, []);
+
+  // Update ref
+  retrySyncRef.current = retrySync;
+
+  // Sync to server
+  const syncToServer = useCallback(
+    (quantity: number) => {
+      // If already syncing, queue this update
+      if (isRequestInFlightRef.current) {
+        pendingQuantityRef.current = quantity;
+        return;
+      }
+
+      // Mark as syncing
+      isRequestInFlightRef.current = true;
+      setIsSyncing(true);
+      setSyncError(false);
+
+      if (quantity <= 0) {
+        removeItem(item.product_id, {
+          onSuccess: () => {
+            isRequestInFlightRef.current = false;
+            setIsSyncing(false);
+            retryCountRef.current = 0;
+            clearPendingUpdate();
+            onUpdate?.();
+
+            // Process queued update if any
+            if (pendingQuantityRef.current !== null) {
+              const nextQuantity = pendingQuantityRef.current;
+              pendingQuantityRef.current = null;
+              setTimeout(() => syncToServerRef.current?.(nextQuantity), 100);
+            }
+          },
+          onError: (error) => {
+            console.error("Remove failed:", error);
+            isRequestInFlightRef.current = false;
+            retrySyncRef.current?.(quantity);
+          },
+        });
+      } else {
+        updateQuantity(
+          { productId: item.product_id, quantity },
+          {
+            onSuccess: () => {
+              isRequestInFlightRef.current = false;
+              setIsSyncing(false);
+              retryCountRef.current = 0;
+              clearPendingUpdate();
+              onUpdate?.();
+
+              // Process queued update if any
+              if (pendingQuantityRef.current !== null) {
+                const nextQuantity = pendingQuantityRef.current;
+                pendingQuantityRef.current = null;
+                setTimeout(() => syncToServerRef.current?.(nextQuantity), 100);
+              }
+            },
+            onError: (error) => {
+              console.error("Update failed:", error);
+              isRequestInFlightRef.current = false;
+
+              // Rollback on error after retries exhausted
+              if (retryCountRef.current >= 3) {
+                setLocalQuantity(item.quantity);
+                clearPendingUpdate();
+              }
+
+              retrySyncRef.current?.(quantity);
+            },
+          }
+        );
+      }
+    },
+    [
+      item.product_id,
+      item.quantity,
+      updateQuantity,
+      removeItem,
+      onUpdate,
+      clearPendingUpdate,
+    ]
+  );
+
+  // Update ref
+  syncToServerRef.current = syncToServer;
+
+  // Load pending updates from sessionStorage on mount
+  useEffect(() => {
+    const loadPendingUpdates = () => {
+      try {
+        const stored = sessionStorage.getItem(PENDING_CART_UPDATES_KEY);
+        if (stored) {
+          const pending: Record<number, PendingUpdate> = JSON.parse(stored);
+          const productPending = pending[item.product_id];
+
+          if (productPending && productPending.quantity !== item.quantity) {
+            // Apply pending update
+            setLocalQuantity(productPending.quantity);
+            pendingQuantityRef.current = productPending.quantity;
+            retryCountRef.current = productPending.retryCount;
+
+            // Trigger sync after a short delay
+            setTimeout(
+              () => syncToServerRef.current?.(productPending.quantity),
+              500
+            );
+          }
+        }
+      } catch (error) {
+        console.error("Failed to load pending updates:", error);
+      }
+    };
+
+    loadPendingUpdates();
+  }, [item.product_id, item.quantity]);
+
+  // Debounced sync
+  useEffect(() => {
+    // Clear existing timers
+    if (debounceTimerRef.current) {
+      clearTimeout(debounceTimerRef.current);
+    }
+
+    // If local quantity matches server, no sync needed
+    if (localQuantity === item.quantity) {
+      return;
+    }
+
+    // Save to sessionStorage immediately
+    savePendingUpdate(localQuantity);
+
+    // Debounce the API call
+    debounceTimerRef.current = setTimeout(() => {
+      syncToServerRef.current?.(localQuantity);
+    }, 800);
+
+    return () => {
+      if (debounceTimerRef.current) {
+        clearTimeout(debounceTimerRef.current);
+      }
+    };
+  }, [localQuantity, item.quantity, savePendingUpdate]);
+
+  // Cleanup
+  useEffect(() => {
+    return () => {
+      if (debounceTimerRef.current) clearTimeout(debounceTimerRef.current);
+      if (retryTimerRef.current) clearTimeout(retryTimerRef.current);
+    };
+  }, []);
+
+  const handleQuantityIncrease = (e: React.MouseEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+
+    // Check stock limit
+    if (localQuantity >= availableStock) {
+      setShowStockModal(true);
+      return;
+    }
+
+    // Optimistic update (instant UI feedback)
+    setLocalQuantity((prev) => prev + 1);
+  };
+
+  const handleQuantityDecrease = (e: React.MouseEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+
+    if (localQuantity <= 1) {
+      handleDelete();
+      return;
+    }
+
+    // Optimistic update (instant UI feedback)
+    setLocalQuantity((prev) => prev - 1);
+  };
+
+  const handleDelete = () => {
+    setLocalQuantity(0);
+    clearPendingUpdate();
+  };
+
+  const getImageSrc = () => {
+    if (item.product.image) return item.product.image;
+    if (item.product.images && item.product.images.length > 0)
+      return item.product.images[0];
+    return "/placeholder.svg";
+  };
+
+  return (
+    <>
+      <Card className="p-4 shadow-none border">
+        <div className="flex flex-col sm:flex-row gap-4">
+          <div className="flex gap-4 flex-1">
+            <div className="relative w-[88px] h-[117px] rounded-xl border overflow-hidden shrink-0">
+              <Image
+                src={getImageSrc()}
+                alt={item.product.name}
+                fill
+                className="object-contain"
+              />
+            </div>
+            <div className="flex flex-col gap-2">
+              <h3 className="font-semibold text-base">{item.product.name}</h3>
+              <p className="text-sm text-gray-600">
+                {item.seller?.name || "Store"}
+              </p>
+              {availableStock <= 5 && (
+                <p className="text-xs text-orange-600 font-medium">
+                  {t("only_left", { count: availableStock })}
+                </p>
+              )}
+              <Button
+                variant="ghost"
+                size="sm"
+                onClick={handleDelete}
+                disabled={isRemoving}
+                className="w-fit cursor-pointer p-0 h-auto hover:bg-transparent hover:text-red-500"
+              >
+                <Trash2 className="h-5 w-5" />
+              </Button>
+            </div>
+          </div>
+
+          <div className="flex flex-col sm:flex-row items-start sm:items-center gap-4 justify-between">
+            <div className="space-y-1">
+              <p className="text-sm font-semibold">
+                {t("unit_price")}{" "}
+                <span className="text-primary">{item.price_formatted}</span>
+              </p>
+
+              {item.discount_formatted &&
+                item.discount_formatted !== "0 TMT" && (
+                  <p className="text-sm font-semibold">
+                    {t("discount")} {item.discount_formatted}
+                  </p>
+                )}
+              <div className="flex items-center gap-2">
+                <span className="text-sm font-semibold">
+                  {t("total_price")}
+                </span>
+                <span className="bg-green-500 text-white px-3 py-1 rounded-lg font-semibold text-base">
+                  {(
+                    parseFloat(item.product.price_amount || "0") * localQuantity
+                  ).toFixed(2)}{" "}
+                  TMT
+                </span>
+              </div>
+            </div>
+
+            <div className="flex items-center gap-2">
+              <Button
+                variant="outline"
+                size="icon"
+                onClick={handleQuantityDecrease}
+                className={` cursor-pointer rounded-lg bg-blue-50 ${
+                  isSyncing ? "opacity-70" : ""
+                }`}
+              >
+                <Minus className="h-4 w-4" />
+              </Button>
+
+              <div className="w-12 text-center font-semibold relative">
+                {localQuantity}
+                {syncError && (
+                  <span
+                    className="absolute -top-1 -right-3 h-2 w-2 bg-red-500 rounded-full"
+                    title="Sync error"
+                  />
+                )}
+              </div>
+
+              <Button
+                variant="outline"
+                size="icon"
+                onClick={handleQuantityIncrease}
+                // disabled={localQuantity >= availableStock}
+                className={`rounded-lg cursor-pointer bg-blue-50 ${
+                  isSyncing ? "opacity-70" : ""
+                } ${
+                  localQuantity >= availableStock
+                    ? "opacity-50 cursor-not-allowed"
+                    : ""
+                }`}
+              >
+                <Plus className="h-4 w-4 text-[#007AFF]" />
+              </Button>
+            </div>
+          </div>
+        </div>
+      </Card>
+
+      {/* Stock Limit Modal */}
+      <Dialog open={showStockModal} onOpenChange={setShowStockModal}>
+        <DialogContent className="sm:max-w-md">
+          <DialogHeader>
+            <div className="flex items-center justify-center mb-4">
+              <div className="rounded-full bg-orange-100 p-3">
+                <AlertTriangle className="h-6 w-6 text-orange-600" />
+              </div>
+            </div>
+            <DialogTitle className="text-center text-xl">
+              {t("stock_limit_title")}
+            </DialogTitle>
+            <DialogDescription className="text-center text-base pt-2">
+              {t("stock_limit_message", {
+                product: item.product.name,
+                stock: availableStock,
+              })}
+            </DialogDescription>
+          </DialogHeader>
+          <div className="flex justify-center mt-4">
+            <Button
+              onClick={() => setShowStockModal(false)}
+              className="w-full rounded-lg cursor-pointer"
+            >
+              {t("understood")}
+            </Button>
+          </div>
+        </DialogContent>
+      </Dialog>
+    </>
+  );
+}

features/cart/components/CartItemSkeleton.tsx

@@ -0,0 +1,36 @@
+import { Card } from "@/components/ui/card";
+import { Skeleton } from "@/components/ui/skeleton";
+
+export default function CartItemSkeleton() {
+  return (
+    <Card className="p-4 shadow-none border">
+      <div className="flex flex-col sm:flex-row gap-4">
+        <div className="flex gap-4 flex-1">
+          <Skeleton className="w-[88px] h-[117px] rounded-xl" />
+          <div className="flex flex-col gap-2 flex-1">
+            <Skeleton className="h-5 w-3/4" />
+            <Skeleton className="h-4 w-1/2" />
+            <Skeleton className="h-4 w-1/3" />
+            <Skeleton className="h-5 w-5 rounded" />
+          </div>
+        </div>
+
+        <div className="flex flex-col sm:flex-row items-start sm:items-center gap-4 justify-between">
+          <div className="space-y-2">
+            <Skeleton className="h-4 w-32" />
+            <Skeleton className="h-4 w-24" />
+            <Skeleton className="h-8 w-40 rounded-lg" />
+          </div>
+
+          <div className="flex items-center gap-2">
+            <Skeleton className="h-10 w-10 rounded-xl" />
+            <Skeleton className="h-6 w-12" />
+            <Skeleton className="h-10 w-10 rounded-xl" />
+          </div>
+        </div>
+      </div>
+    </Card>
+  );
+}
+
+

features/cart/components/DeliveryTypeSelector.tsx

@@ -0,0 +1,58 @@
+"use client"
+import { Truck, Warehouse } from "lucide-react"
+import { Card } from "@/components/ui/card"
+import { useTranslations } from "next-intl"
+import type { DeliveryType } from "@/lib/types/api"
+
+interface DeliveryTypeSelectorProps {
+  selectedType: DeliveryType
+  onSelect: (type: DeliveryType) => void
+}
+
+export default function DeliveryTypeSelector({
+  selectedType,
+  onSelect,
+}: DeliveryTypeSelectorProps) {
+  const t = useTranslations()
+  
+  const deliveryOptions: {
+    type: DeliveryType
+    label: string
+    icon: typeof Truck
+  }[] = [
+    { type: "SELECTED_DELIVERY", label: t("delivery"), icon: Truck },
+    { type: "PICK_UP", label: t("pickup"), icon: Warehouse },
+  ]
+
+  return (
+    <div className="mb-6">
+      <h3 className="text-lg font-semibold mb-3">{t("delivery_type")}</h3>
+      <div className="flex gap-2">
+        {deliveryOptions.map(({ type, label, icon: Icon }) => (
+          <Card
+            key={type}
+            className={`flex-1 cursor-pointer transition-all hover:shadow-md ${
+              selectedType === type
+                ? "border-2 border-[#005bff] bg-blue-50"
+                : "border-2 border-gray-200"
+            }`}
+            onClick={() => onSelect(type)}
+          >
+            <div className="flex flex-col items-center justify-center p-4 gap-2">
+              <Icon
+                className={`h-8 w-8 ${
+                  selectedType === type ? "text-[#005bff]" : "text-gray-600"
+                }`}
+              />
+              <span className={`text-xs font-medium ${
+                selectedType === type ? "text-[#005bff]" : "text-gray-700"
+              }`}>
+                {label}
+              </span>
+            </div>
+          </Card>
+        ))}
+      </div>
+    </div>
+  )
+}

features/cart/components/EmptyCart.tsx

@@ -0,0 +1,30 @@
+import { Button } from "@/components/ui/button";
+import { ShoppingCart } from "lucide-react";
+import { useTranslations } from "next-intl";
+import { useRouter } from "next/navigation";
+
+export default function EmptyCart() {
+  const t=useTranslations();
+  const router=useRouter();
+  return (
+    <div className="flex min-h-[60vh] items-center justify-center px-4">
+      <div className="w-full max-w-md rounded-2xl bg-linear-to-br from-blue-50 to-white p-8 text-center shadow-lg">
+        <div className="mx-auto mb-6 flex h-20 w-20 items-center justify-center rounded-full bg-blue-100">
+          <ShoppingCart className="h-10 w-10 text-blue-600" />
+        </div>
+
+        <h2 className="mb-2 text-2xl font-semibold text-gray-900">
+          {t("cart_empty")}
+        </h2>
+
+        <p className="mb-6 text-sm text-gray-500">
+          {t("cart_empty_message")}
+        </p>
+
+        <Button onClick={()=>router.push("/")} className="w-full cursor-pointer rounded-xl bg-blue-600 px-6 py-3 text-sm font-medium text-white transition hover:bg-blue-700 active:scale-95">
+          {t("start_shopping")}
+        </Button>
+      </div>
+    </div>
+  );
+}

features/cart/components/OrderSummary.tsx

@@ -0,0 +1,348 @@
+"use client";
+import { Button } from "@/components/ui/button";
+import { Card } from "@/components/ui/card";
+import { Label } from "@/components/ui/label";
+import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
+import { Textarea } from "@/components/ui/textarea";
+import { Separator } from "@/components/ui/separator";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+import { Input } from "@/components/ui/input";
+import DeliveryTypeSelector from "./DeliveryTypeSelector";
+import { useTranslations } from "next-intl";
+import type { DeliveryType, PaymentType, Province } from "@/lib/types/api";
+import { useState } from "react";
+
+interface OrderBillingItem {
+  title: string;
+  value: string;
+}
+
+interface OrderBilling {
+  body: OrderBillingItem[];
+  footer: {
+    title: string;
+    value: string;
+  };
+}
+
+interface OrderSummaryProps {
+  order: {
+    id: number;
+    billing: OrderBilling;
+  };
+  paymentType: PaymentType | null;
+  deliveryType: DeliveryType;
+  selectedRegion: string;
+  selectedProvince: number | null;
+  note: string;
+  regionGroups: Record<string, Province[]>;
+  availableRegions: string[];
+  paymentTypes: PaymentType[];
+  phone: string;
+  name: string;
+  lastName: string;
+  onPhoneChange: (phone: string) => void;
+  onNameChange: (name: string) => void;
+  onLastNameChange: (lastName: string) => void;
+  onPaymentTypeChange: (type: PaymentType) => void;
+  onDeliveryTypeChange: (type: DeliveryType) => void;
+  onRegionChange: (regionCode: string) => void;
+  onProvinceChange: (provinceId: number) => void;
+  onNoteChange: (note: string) => void;
+  onCompleteOrder: () => void;
+  isLoading: boolean;
+}
+
+export default function OrderSummary({
+  order,
+  paymentType,
+  deliveryType,
+  selectedRegion,
+  selectedProvince,
+  note,
+  regionGroups,
+  availableRegions,
+  paymentTypes,
+  phone,
+  name,
+  lastName,
+  onPhoneChange,
+  onNameChange,
+  onLastNameChange,
+  onPaymentTypeChange,
+  onDeliveryTypeChange,
+  onRegionChange,
+  onProvinceChange,
+  onNoteChange,
+  onCompleteOrder,
+  isLoading,
+}: OrderSummaryProps) {
+  const t = useTranslations();
+  const [showValidation, setShowValidation] = useState(false);
+
+  const provincesForSelectedRegion = selectedRegion
+    ? regionGroups[selectedRegion] || []
+    : [];
+
+  const phoneDigits = phone.replace(/\D/g, "");
+  const isPhoneValid = phoneDigits.length === 11;
+
+  const isFormValid =
+    selectedRegion &&
+    selectedProvince &&
+    paymentType &&
+    isPhoneValid &&
+    name.trim() !== "" &&
+    lastName.trim() !== "";
+
+  const handlePhoneChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const input = e.target.value;
+    const prefix = "+993 ";
+
+    if (input.length < prefix.length) {
+      onPhoneChange(prefix);
+      return;
+    }
+
+    const digitsOnly = input.substring(prefix.length).replace(/\D/g, "");
+
+    const limitedDigits = digitsOnly.substring(0, 8);
+
+    let formattedPhone = prefix;
+    if (limitedDigits.length > 0) {
+      formattedPhone += limitedDigits.substring(0, 2);
+
+      if (limitedDigits.length > 2) {
+        formattedPhone += " " + limitedDigits.substring(2);
+      }
+    }
+
+    onPhoneChange(formattedPhone);
+  };
+
+  const handleCompleteOrderClick = () => {
+    setShowValidation(true);
+    if (isFormValid) {
+      onCompleteOrder();
+    }
+  };
+
+  return (
+    <Card className="w-full md:w-[380px] p-4 md:p-6 rounded-xl h-fit sticky top-20">
+      {/* Customer Information */}
+      <div className="mb-6">
+        <h3 className="text-lg font-semibold mb-3">
+          {t("customer_information")}
+        </h3>
+        <div className="space-y-5">
+          <div>
+            <Label className="text-sm font-medium mb-2 block">
+              {t("name")}
+            </Label>
+            <Input
+              type="text"
+              value={name}
+              onChange={(e) => onNameChange(e.target.value)}
+              placeholder={t("name")}
+              className={`rounded-lg ${
+                showValidation && name.trim() === "" ? "border-red-500" : ""
+              }`}
+            />
+            {showValidation && name.trim() === "" && (
+              <p className="text-xs text-red-500 mt-1">{t("requiredField")}</p>
+            )}
+          </div>
+          <div>
+            <Label className="text-sm font-medium mb-2 block">
+              {t("last_name")}
+            </Label>
+            <Input
+              type="text"
+              value={lastName}
+              onChange={(e) => onLastNameChange(e.target.value)}
+              placeholder={t("last_name")}
+              className={`rounded-lg ${
+                showValidation && lastName.trim() === "" ? "border-red-500" : ""
+              }`}
+            />
+            {showValidation && lastName.trim() === "" && (
+              <p className="text-xs text-red-500 mt-1">{t("requiredField")}</p>
+            )}
+          </div>
+          <div>
+            <Label className="text-sm font-medium mb-2 block">
+              {t("phone")}
+            </Label>
+            <Input
+              type="tel"
+              value={phone}
+              onChange={handlePhoneChange}
+              placeholder="+993 61 097651"
+              className={`rounded-lg ${
+                showValidation && !isPhoneValid ? "border-red-500" : ""
+              }`}
+            />
+            {showValidation && !isPhoneValid && (
+              <p className="text-xs text-red-500 mt-1">
+                {t("requiredField")}
+              </p>
+            )}
+          </div>
+        </div>
+      </div>
+
+      {/* Payment Type */}
+      <div className="mb-6">
+        <h3 className="text-lg font-semibold mb-3">{t("payment_type")}</h3>
+        <div className="flex gap-2">
+          {paymentTypes.map((type) => (
+            <Card
+              key={type.id}
+              className={`flex-1 cursor-pointer transition-all ${
+                paymentType?.id === type.id
+                  ? "border-2 border-[#005bff] bg-blue-50"
+                  : showValidation && !paymentType
+                  ? "border-2 border-red-500"
+                  : "border-2 border-gray-200"
+              }`}
+              onClick={() => onPaymentTypeChange(type)}
+            >
+              <div className="flex flex-col items-center justify-center p-4 gap-2">
+                <span
+                  className={`text-xs font-medium ${
+                    paymentType?.id === type.id ? "text-[#005bff]" : ""
+                  }`}
+                >
+                  {type.name}
+                </span>
+              </div>
+            </Card>
+          ))}
+        </div>
+        {showValidation && !paymentType && (
+          <p className="text-xs text-red-500 mt-1">{t("requiredField")}</p>
+        )}
+      </div>
+
+      {/* Region Selection */}
+      <div className="mb-6">
+        <Label className="text-lg font-semibold mb-3 block">
+          {t("choose_region")}
+        </Label>
+        <RadioGroup
+          value={selectedRegion}
+          onValueChange={(value) => {
+            onRegionChange(value);
+            onProvinceChange(null as any);
+          }}
+          className="flex flex-wrap gap-4"
+        >
+          {availableRegions.map((regionCode) => (
+            <div key={regionCode} className="flex items-center space-x-2">
+              <RadioGroupItem
+                value={regionCode}
+                id={`region-${regionCode}`}
+                className={`border-2 ${
+                  showValidation && !selectedRegion
+                    ? "border-red-500"
+                    : "border-gray-400"
+                } data-[state=checked]:border-[#005bff] data-[state=checked]:bg-white`}
+              />
+              <Label
+                htmlFor={`region-${regionCode}`}
+                className="cursor-pointer uppercase"
+              >
+                {regionCode}
+              </Label>
+            </div>
+          ))}
+        </RadioGroup>
+        {showValidation && !selectedRegion && (
+          <p className="text-xs text-red-500 mt-1">{t("requiredField")}</p>
+        )}
+      </div>
+
+      {/* Province Selection */}
+      {selectedRegion && provincesForSelectedRegion.length > 0 && (
+        <div className="mb-6">
+          <Label className="text-lg font-semibold mb-3 block">
+            {t("choose_address")}
+          </Label>
+          <Select
+            value={selectedProvince?.toString() || ""}
+            onValueChange={(value) => onProvinceChange(parseInt(value))}
+          >
+            <SelectTrigger
+              className={`rounded-lg w-full ${
+                showValidation && !selectedProvince ? "border-red-500" : ""
+              }`}
+            >
+              <SelectValue placeholder={t("choose_address")} />
+            </SelectTrigger>
+            <SelectContent>
+              {provincesForSelectedRegion.map((province) => (
+                <SelectItem key={province.id} value={province.id.toString()}>
+                  {province.name}
+                </SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+          {showValidation && !selectedProvince && (
+            <p className="text-xs text-red-500 mt-1">{t("requiredField")}</p>
+          )}
+        </div>
+      )}
+
+      {/* Note */}
+      <div className="mb-6">
+        <Label className="text-lg font-semibold mb-3 block">{t("note")}</Label>
+        <Textarea
+          value={note}
+          onChange={(e) => onNoteChange(e.target.value)}
+          className="rounded-xl resize-none"
+          rows={3}
+          placeholder={t("note")}
+        />
+      </div>
+
+      {/* Billing */}
+      <div className="space-y-2 mb-4">
+        {order.billing.body.map((item, index) => (
+          <div
+            key={index}
+            className="flex justify-between text-base font-medium"
+          >
+            <span>{item.title}:</span>
+            <span>{item.value}</span>
+          </div>
+        ))}
+      </div>
+
+      <Separator className="my-4" />
+
+      <div className="flex justify-between items-center mb-6">
+        <span className="text-lg font-semibold">
+          {order.billing.footer.title}:
+        </span>
+        <span className="text-lg font-bold text-green-600">
+          {order.billing.footer.value}
+        </span>
+      </div>
+
+      <Button
+        onClick={handleCompleteOrderClick}
+        disabled={isLoading}
+        className="w-full rounded-lg cursor-pointer bg-[#005bff] hover:bg-[#004dcc] h-12 text-lg font-bold disabled:opacity-50"
+        size="lg"
+      >
+        {isLoading ? `${t("order")}...` : t("order")}
+      </Button>
+    </Card>
+  );
+}

features/cart/components/OrderSummarySkeleton.tsx

@@ -0,0 +1,81 @@
+import { Card } from "@/components/ui/card";
+import { Skeleton } from "@/components/ui/skeleton";
+import { Separator } from "@/components/ui/separator";
+
+export default function OrderSummarySkeleton() {
+  return (
+    <Card className="w-full md:w-[380px] p-4 md:p-6 rounded-xl h-fit sticky top-20">
+      {/* Customer Information */}
+      <div className="mb-6">
+        <Skeleton className="h-6 w-48 mb-3" />
+        <div className="space-y-4">
+          <div>
+            <Skeleton className="h-4 w-20 mb-2" />
+            <Skeleton className="h-10 w-full rounded-lg" />
+          </div>
+          <div>
+            <Skeleton className="h-4 w-24 mb-2" />
+            <Skeleton className="h-10 w-full rounded-lg" />
+          </div>
+          <div>
+            <Skeleton className="h-4 w-16 mb-2" />
+            <Skeleton className="h-10 w-full rounded-lg" />
+          </div>
+        </div>
+      </div>
+
+      {/* Payment Type */}
+      <div className="mb-6">
+        <Skeleton className="h-6 w-32 mb-3" />
+        <div className="flex gap-2">
+          <Skeleton className="flex-1 h-20 rounded-lg" />
+          <Skeleton className="flex-1 h-20 rounded-lg" />
+        </div>
+      </div>
+
+      {/* Region Selection */}
+      <div className="mb-6">
+        <Skeleton className="h-6 w-36 mb-3" />
+        <div className="flex flex-wrap gap-4">
+          {Array.from({ length: 4 }).map((_, i) => (
+            <div key={i} className="flex items-center gap-2">
+              <Skeleton className="h-4 w-4 rounded-full" />
+              <Skeleton className="h-4 w-16" />
+            </div>
+          ))}
+        </div>
+      </div>
+
+      {/* Province Selection */}
+      <div className="mb-6">
+        <Skeleton className="h-6 w-40 mb-3" />
+        <Skeleton className="h-10 w-full rounded-lg" />
+      </div>
+
+      {/* Note */}
+      <div className="mb-6">
+        <Skeleton className="h-6 w-24 mb-3" />
+        <Skeleton className="h-24 w-full rounded-xl" />
+      </div>
+
+      {/* Billing */}
+      <div className="space-y-2 mb-4">
+        {Array.from({ length: 3 }).map((_, i) => (
+          <div key={i} className="flex justify-between">
+            <Skeleton className="h-5 w-24" />
+            <Skeleton className="h-5 w-20" />
+          </div>
+        ))}
+      </div>
+
+      <Separator className="my-4" />
+
+      <div className="flex justify-between items-center mb-6">
+        <Skeleton className="h-6 w-32" />
+        <Skeleton className="h-6 w-28" />
+      </div>
+
+      <Skeleton className="h-12 w-full rounded-lg" />
+    </Card>
+  );
+}

features/cart/hooks/useAddresses.ts

@@ -0,0 +1,25 @@
+import { useQuery } from "@tanstack/react-query"
+import { apiClient } from "@/lib/api"
+
+interface Province {
+  id: number
+  region: string
+  name: string
+}
+
+interface ProvincesResponse {
+  message: string
+  data: Province[]
+}
+
+export function useRegions() {
+  return useQuery({
+    queryKey: ["regions"],
+    queryFn: async () => {
+      const response = await apiClient.get<ProvincesResponse>("/provinces")
+      return response.data.data
+    },
+    staleTime: 1000 * 60 * 60, // 1 hour
+  })
+}
+

features/cart/hooks/useCart.ts

@@ -0,0 +1,508 @@
+import {
+  useQuery,
+  useMutation,
+  useQueryClient,
+  UseQueryOptions,
+} from "@tanstack/react-query";
+import { apiClient } from "@/lib/api";
+import type { CartItem } from "@/lib/types/api";
+import { useEffect } from "react";
+
+interface CartResponse {
+  message: string;
+  data: CartItem[];
+  errorDetails?: string;
+}
+
+const pendingUpdates = new Map<number, number>();
+let updateLock = false;
+
+class CartEventEmitter {
+  private listeners: Set<() => void> = new Set();
+
+  subscribe(callback: () => void) {
+    this.listeners.add(callback);
+    return () => {
+      this.listeners.delete(callback);
+    };
+  }
+
+  emit() {
+    this.listeners.forEach((cb) => cb());
+  }
+}
+
+export const cartEvents = new CartEventEmitter();
+
+function transformCartResponse(response: any): CartResponse {
+  if (
+    typeof response === "string" &&
+    (response.trim().startsWith("<!DOCTYPE") ||
+      response.trim().startsWith("<html"))
+  ) {
+    return {
+      message: "error",
+      data: [],
+      errorDetails: "Server returned HTML instead of JSON.",
+    };
+  }
+
+  if (typeof response === "object") {
+    if (response.data) return response;
+    return { message: "success", data: [] };
+  }
+
+  if (typeof response === "string") {
+    try {
+      return JSON.parse(response);
+    } catch {
+      return { message: "error", data: [] };
+    }
+  }
+
+  return { message: "unknown", data: [] };
+}
+
+export function useCart(options?: Partial<UseQueryOptions<CartResponse>>) {
+  const queryClient = useQueryClient();
+
+  const query = useQuery({
+    queryKey: ["cart"],
+    queryFn: async () => {
+      const response = await apiClient.get("/carts");
+      const transformed = transformCartResponse(response.data);
+      return transformed;
+    },
+    refetchOnMount: false,
+    refetchOnWindowFocus: false,
+    refetchOnReconnect: true,
+    staleTime: Infinity,
+    gcTime: 1000 * 60 * 5,
+    retry: 2,
+    retryDelay: (attemptIndex) => Math.min(1000 * 2 ** attemptIndex, 10000),
+    ...options,
+  });
+
+  useEffect(() => {
+    const unsubscribe = cartEvents.subscribe(() => {
+      queryClient.invalidateQueries({
+        queryKey: ["cart"],
+        refetchType: "none",
+      });
+    });
+    return () => {
+      unsubscribe();
+    };
+  }, [queryClient]);
+
+  return query;
+}
+
+export function useAddToCart() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async ({
+      productId,
+      quantity = 1,
+    }: {
+      productId: number;
+      quantity?: number;
+    }) => {
+      const params = new URLSearchParams({
+        product_id: String(productId),
+        product_quantity: String(quantity),
+      });
+
+      const response = await apiClient.post("/carts", params.toString(), {
+        headers: {
+          "Content-Type": "application/x-www-form-urlencoded",
+        },
+      });
+
+      if (typeof response.data === "object" && response.data.data) {
+        return response.data;
+      }
+
+      if (typeof response.data === "string") {
+        try {
+          return JSON.parse(response.data);
+        } catch {
+          return { message: "success", data: "Added to cart" };
+        }
+      }
+
+      return { message: "success", data: "Added to cart" };
+    },
+    onMutate: async ({ productId, quantity }) => {
+      while (updateLock) {
+        await new Promise((resolve) => setTimeout(resolve, 50));
+      }
+      updateLock = true;
+
+      await queryClient.cancelQueries({ queryKey: ["cart"] });
+
+      const previousCart = queryClient.getQueryData<CartResponse>(["cart"]);
+
+      queryClient.setQueryData<CartResponse>(["cart"], (old) => {
+        if (!old) return old;
+
+        let updated = { ...old, data: [...old.data] };
+
+        pendingUpdates.forEach((pendingQty, pendingId) => {
+          const idx = updated.data.findIndex(
+            (item: any) => item.product?.id === pendingId
+          );
+          if (idx !== -1) {
+            updated.data[idx] = {
+              ...updated.data[idx],
+              product_quantity: pendingQty,
+            };
+          }
+        });
+
+        const existingItem = updated.data.find(
+          (item: any) => item.product?.id === productId
+        );
+
+        if (existingItem) {
+          updated.data = updated.data.map((item: any) =>
+            item.product?.id === productId
+              ? {
+                  ...item,
+                  product_quantity: item.product_quantity + quantity,
+                }
+              : item
+          );
+        } else {
+          updated.data = [
+            ...updated.data,
+            {
+              product: { id: productId },
+              product_quantity: quantity,
+            } as any,
+          ];
+        }
+
+        const finalItem = updated.data.find(
+          (item: any) => item.product?.id === productId
+        );
+        if (finalItem) {
+          pendingUpdates.set(productId, finalItem.product_quantity);
+        }
+
+        return updated;
+      });
+
+      cartEvents.emit();
+      updateLock = false;
+
+      return { previousCart };
+    },
+    onError: (error, variables, context) => {
+      if (context?.previousCart) {
+        queryClient.setQueryData(["cart"], context.previousCart);
+        pendingUpdates.delete(variables.productId);
+        cartEvents.emit();
+      }
+    },
+    onSuccess: (data, variables) => {
+      pendingUpdates.delete(variables.productId);
+      queryClient.invalidateQueries({
+        queryKey: ["cart"],
+        refetchType: "active",
+      });
+    },
+  });
+}
+
+export function useRemoveFromCart() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (productId: number) => {
+      const params = new URLSearchParams({ product_id: String(productId) });
+
+      const response = await apiClient.patch("/carts", params.toString(), {
+        headers: {
+          "Content-Type": "application/x-www-form-urlencoded",
+        },
+      });
+
+      if (typeof response.data === "object" && response.data.data) {
+        return response.data.data;
+      }
+
+      if (typeof response.data === "string") {
+        try {
+          const parsed = JSON.parse(response.data);
+          return parsed.data || [];
+        } catch {
+          return [];
+        }
+      }
+
+      return [];
+    },
+    onMutate: async (productId) => {
+      while (updateLock) {
+        await new Promise((resolve) => setTimeout(resolve, 50));
+      }
+      updateLock = true;
+
+      await queryClient.cancelQueries({ queryKey: ["cart"] });
+
+      const previousCart = queryClient.getQueryData<CartResponse>(["cart"]);
+
+      queryClient.setQueryData<CartResponse>(["cart"], (old) => {
+        if (!old) return old;
+
+        let updated = { ...old, data: [...old.data] };
+        pendingUpdates.forEach((pendingQty, pendingId) => {
+          if (pendingId !== productId) {
+            const idx = updated.data.findIndex(
+              (item: any) => item.product?.id === pendingId
+            );
+            if (idx !== -1) {
+              updated.data[idx] = {
+                ...updated.data[idx],
+                product_quantity: pendingQty,
+              };
+            }
+          }
+        });
+
+        updated.data = updated.data.filter(
+          (item: any) => item.product?.id !== productId
+        );
+
+        pendingUpdates.delete(productId);
+        return updated;
+      });
+
+      cartEvents.emit();
+      updateLock = false;
+
+      return { previousCart };
+    },
+    onError: (error, variables, context) => {
+      if (context?.previousCart) {
+        queryClient.setQueryData(["cart"], context.previousCart);
+        cartEvents.emit();
+      }
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        queryKey: ["cart"],
+        refetchType: "active",
+      });
+    },
+  });
+}
+
+export function useCleanCart() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async () => {
+      const response = await apiClient.delete("/carts", {
+        headers: {
+          "Content-Type": "application/x-www-form-urlencoded",
+        },
+      });
+
+      if (typeof response.data === "object" && response.data.data) {
+        return response.data.data;
+      }
+
+      if (typeof response.data === "string") {
+        try {
+          const parsed = JSON.parse(response.data);
+          return parsed.data || [];
+        } catch {
+          return [];
+        }
+      }
+
+      return [];
+    },
+    onMutate: async () => {
+      while (updateLock) {
+        await new Promise((resolve) => setTimeout(resolve, 50));
+      }
+      updateLock = true;
+
+      await queryClient.cancelQueries({ queryKey: ["cart"] });
+
+      const previousCart = queryClient.getQueryData<CartResponse>(["cart"]);
+
+      queryClient.setQueryData<CartResponse>(["cart"], (old) => {
+        if (!old) return old;
+        pendingUpdates.clear();
+        return { ...old, data: [] };
+      });
+
+      cartEvents.emit();
+      updateLock = false;
+
+      return { previousCart };
+    },
+    onError: (error, variables, context) => {
+      if (context?.previousCart) {
+        queryClient.setQueryData(["cart"], context.previousCart);
+        cartEvents.emit();
+      }
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["cart"] });
+    },
+  });
+}
+
+export function useUpdateCartItemQuantity() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async ({
+      productId,
+      quantity,
+    }: {
+      productId: number;
+      quantity: number;
+    }) => {
+      const params = new URLSearchParams({
+        product_id: String(productId),
+        product_quantity: String(quantity),
+      });
+
+      const response = await apiClient.post("/carts", params.toString(), {
+        headers: {
+          "Content-Type": "application/x-www-form-urlencoded",
+        },
+        timeout: 15000,
+      });
+
+      if (typeof response.data === "object" && response.data.data) {
+        return response.data;
+      }
+
+      if (typeof response.data === "string") {
+        try {
+          return JSON.parse(response.data);
+        } catch {
+          return { message: "success", data: "Updated cart" };
+        }
+      }
+
+      return { message: "success", data: "Updated cart" };
+    },
+    onMutate: async ({ productId, quantity }) => {
+      while (updateLock) {
+        await new Promise((resolve) => setTimeout(resolve, 50));
+      }
+      updateLock = true;
+
+      await queryClient.cancelQueries({ queryKey: ["cart"] });
+
+      const previousCart = queryClient.getQueryData<CartResponse>(["cart"]);
+
+      queryClient.setQueryData<CartResponse>(["cart"], (old) => {
+        if (!old) return old;
+
+        let updated = { ...old, data: [...old.data] };
+
+        pendingUpdates.forEach((pendingQty, pendingId) => {
+          const idx = updated.data.findIndex(
+            (item: any) => item.product?.id === pendingId
+          );
+          if (idx !== -1) {
+            updated.data[idx] = {
+              ...updated.data[idx],
+              product_quantity: pendingQty,
+            };
+          }
+        });
+
+        updated.data = updated.data.map((item: any) =>
+          item.product?.id === productId
+            ? { ...item, product_quantity: quantity }
+            : item
+        );
+
+        pendingUpdates.set(productId, quantity);
+
+        return updated;
+      });
+
+      cartEvents.emit();
+      updateLock = false;
+
+      return { previousCart };
+    },
+    onError: (error, variables, context) => {
+      if (context?.previousCart) {
+        queryClient.setQueryData(["cart"], context.previousCart);
+        pendingUpdates.delete(variables.productId);
+        cartEvents.emit();
+      }
+      throw error;
+    },
+    onSuccess: (data, variables) => {
+      pendingUpdates.delete(variables.productId);
+      queryClient.invalidateQueries({
+        queryKey: ["cart"],
+        refetchType: "none",
+      });
+    },
+  });
+}
+
+export function useCreateOrder() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (payload: {
+      customer_name?: string;
+      customer_phone: number;
+      customer_address: string;
+      shipping_method: string;
+      payment_type_id: number;
+      delivery_time?: string;
+      delivery_at?: string;
+      region: string;
+      note?: string;
+    }) => {
+      const response = await apiClient.post("/orders", payload);
+      return response.data;
+    },
+    onSuccess: (data) => {
+      if (data && data.payment_url) {
+        window.open(data.payment_url, '_blank')?.focus();
+      }
+
+      pendingUpdates.clear();
+      queryClient.setQueryData<CartResponse>(["cart"], (old) => {
+        if (!old) return old;
+        return { ...old, data: [] };
+      });
+      cartEvents.emit();
+      queryClient.invalidateQueries({ queryKey: ["orders"] });
+    },
+    onError: (error: any) => {
+      console.error(
+        "Create order error:",
+        error.response?.data?.message || error.message
+      );
+    },
+  });
+}
+
+export function useCartCount() {
+  const { data } = useCart();
+  return (
+    data?.data?.reduce(
+      (sum: number, item: any) => sum + (item.product_quantity || 0),
+      0
+    ) || 0
+  );
+}

features/cart/hooks/usePaymentTypes.ts

@@ -0,0 +1,23 @@
+import { useQuery } from "@tanstack/react-query"
+import { apiClient } from "@/lib/api"
+
+interface PaymentType {
+  id: number
+  name: string
+}
+
+interface PaymentTypesResponse {
+  message: string
+  data: PaymentType[]
+}
+
+export function usePaymentTypes() {
+  return useQuery({
+    queryKey: ["paymentTypes"],
+    queryFn: async () => {
+      const response = await apiClient.get<PaymentTypesResponse>("/order-payments")
+      return response.data.data
+    },
+    staleTime: 1000 * 60 * 60, // 1 hour
+  })
+}