feat: auth flow (Gooyal OTP/OAuth2) + customer home page against live staging API

- Session stored as an encrypted (JWE) httpOnly cookie; access/refresh tokens
  never reach the client, client_secret never leaves the server.
- winofyFetch: server-side API client matching FRONTEND_GUIDE.md's plain-success
  / wrapped-error (§4.1-4.2) convention, with auto token refresh.
- Login page (phone -> OTP) wired to Gooyal accounts staging; request_otp
  verified working end-to-end. Token exchange returns invalid_client with the
  client_id/secret currently on hand — needs a fix from whoever issued them.
- proxy.ts (Next 16's renamed middleware) gates seller/cart/checkout/orders
  routes, verified redirecting unauthenticated requests to /login.
- Customer home page renders real store/category data fetched live from
  winofy-staging.winsoo.ir.

next.config.ts

@@ -1,7 +1,9 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  /* config options here */
+  turbopack: {
+    root: __dirname,
+  },
 };
 
 export default nextConfig;

package.json

@@ -9,9 +9,23 @@
     "lint": "eslint"
   },
   "dependencies": {
+    "@radix-ui/react-checkbox": "^1.3.11",
+    "@radix-ui/react-dialog": "^1.1.23",
+    "@radix-ui/react-label": "^2.1.15",
+    "@radix-ui/react-select": "^2.3.7",
+    "@radix-ui/react-slot": "^1.3.3",
+    "@radix-ui/react-tabs": "^1.1.21",
+    "@radix-ui/react-toast": "^1.2.23",
+    "@tanstack/react-query": "^5.101.4",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "jose": "^6.2.9",
+    "lucide-react": "^1.31.0",
     "next": "16.3.1",
     "react": "19.2.8",
-    "react-dom": "19.2.8"
+    "react-dom": "19.2.8",
+    "tailwind-merge": "^3.6.0",
+    "zod": "^4.4.3"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",

src/app/(auth)/login/page.tsx

@@ -0,0 +1,121 @@
+"use client";
+
+import { useState } from "react";
+import { useRouter, useSearchParams } from "next/navigation";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+
+type Step = "phone" | "otp";
+
+export default function LoginPage() {
+  const router = useRouter();
+  const searchParams = useSearchParams();
+  const next = searchParams.get("next") ?? "/";
+
+  const [step, setStep] = useState<Step>("phone");
+  const [phone, setPhone] = useState("");
+  const [otp, setOtp] = useState("");
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  async function handleRequestOtp(e: React.FormEvent) {
+    e.preventDefault();
+    setError(null);
+    setLoading(true);
+    try {
+      const res = await fetch("/api/auth/request-otp", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ phone_number: phone }),
+      });
+      const data = await res.json();
+      if (!res.ok) throw new Error(data.message ?? "خطا در ارسال کد تایید");
+      setStep("otp");
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "خطا در ارسال کد تایید");
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  async function handleVerifyOtp(e: React.FormEvent) {
+    e.preventDefault();
+    setError(null);
+    setLoading(true);
+    try {
+      const res = await fetch("/api/auth/verify-otp", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ phone_number: phone, otp }),
+      });
+      const data = await res.json();
+      if (!res.ok) throw new Error(data.message ?? "کد تایید نامعتبر است");
+      router.push(next);
+      router.refresh();
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "کد تایید نامعتبر است");
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  return (
+    <main className="mx-auto flex min-h-full w-full max-w-sm flex-1 flex-col justify-center gap-6 px-6 py-10">
+      <div className="text-center">
+        <h1 className="text-2xl font-bold">ورود به وینوفی</h1>
+        <p className="mt-2 text-sm text-muted-foreground">
+          {step === "phone"
+            ? "شماره موبایل خود را وارد کنید"
+            : `کد ارسال شده به ${phone} را وارد کنید`}
+        </p>
+      </div>
+
+      {step === "phone" ? (
+        <form onSubmit={handleRequestOtp} className="flex flex-col gap-4">
+          <Input
+            type="tel"
+            inputMode="tel"
+            dir="ltr"
+            placeholder="09123456789"
+            value={phone}
+            onChange={(e) => setPhone(e.target.value)}
+            required
+            className="text-center"
+          />
+          {error && <p className="text-center text-sm text-destructive">{error}</p>}
+          <Button type="submit" disabled={loading} size="lg">
+            {loading ? "در حال ارسال..." : "دریافت کد تایید"}
+          </Button>
+        </form>
+      ) : (
+        <form onSubmit={handleVerifyOtp} className="flex flex-col gap-4">
+          <Input
+            type="text"
+            inputMode="numeric"
+            dir="ltr"
+            placeholder="12345"
+            value={otp}
+            onChange={(e) => setOtp(e.target.value)}
+            required
+            className="text-center tracking-[0.5em]"
+          />
+          {error && <p className="text-center text-sm text-destructive">{error}</p>}
+          <Button type="submit" disabled={loading} size="lg">
+            {loading ? "در حال بررسی..." : "تایید و ورود"}
+          </Button>
+          <button
+            type="button"
+            onClick={() => {
+              setStep("phone");
+              setOtp("");
+              setError(null);
+            }}
+            className="text-sm text-muted-foreground underline underline-offset-4"
+          >
+            ویرایش شماره موبایل
+          </button>
+        </form>
+      )}
+    </main>
+  );
+}

src/app/(customer)/page.tsx

@@ -0,0 +1,85 @@
+import Link from "next/link";
+import { winofyFetch, type PaginatedResponse } from "@/lib/api/winofy";
+import { resolveMediaUrl } from "@/lib/api/media";
+import type { StoreCategory, StoreListItem } from "@/types/api";
+
+async function getStoreCategories() {
+  const res = await winofyFetch<PaginatedResponse<StoreCategory> | StoreCategory[]>("/v1/store-categories/", {
+    auth: false,
+  });
+  return Array.isArray(res) ? res : res.results;
+}
+
+async function getStores() {
+  const res = await winofyFetch<PaginatedResponse<StoreListItem>>("/v1/stores/?limit=12", { auth: false });
+  return res.results;
+}
+
+export default async function HomePage() {
+  const [categories, stores] = await Promise.all([getStoreCategories(), getStores()]);
+
+  return (
+    <main className="mx-auto flex w-full max-w-5xl flex-1 flex-col gap-8 px-4 py-6">
+      <header className="flex items-center justify-between">
+        <h1 className="text-xl font-bold">وینوفی</h1>
+        <Link href="/login" className="text-sm text-primary underline underline-offset-4">
+          ورود
+        </Link>
+      </header>
+
+      <section className="flex flex-col gap-3">
+        <h2 className="text-sm font-semibold text-muted-foreground">دسته‌بندی‌ها</h2>
+        <div className="flex gap-3 overflow-x-auto pb-2">
+          {categories.map((category) => (
+            <div
+              key={category.uuid}
+              className="flex shrink-0 flex-col items-center gap-2 rounded-2xl border border-border px-4 py-3"
+            >
+              {category.icon && (
+                // eslint-disable-next-line @next/next/no-img-element
+                <img src={resolveMediaUrl(category.icon) ?? undefined} alt="" className="h-8 w-8" />
+              )}
+              <span className="text-xs">{category.name}</span>
+            </div>
+          ))}
+          {categories.length === 0 && <p className="text-sm text-muted-foreground">دسته‌بندی‌ای یافت نشد.</p>}
+        </div>
+      </section>
+
+      <section className="flex flex-col gap-3">
+        <h2 className="text-sm font-semibold text-muted-foreground">فروشگاه‌های نزدیک شما</h2>
+        <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 md:grid-cols-3">
+          {stores.map((store) => (
+            <article key={store.uuid} className="flex flex-col gap-2 rounded-2xl border border-border p-4">
+              <div className="flex items-center gap-3">
+                {store.logo ? (
+                  // eslint-disable-next-line @next/next/no-img-element
+                  <img
+                    src={resolveMediaUrl(store.logo) ?? undefined}
+                    alt={store.name}
+                    className="h-12 w-12 rounded-full object-cover"
+                  />
+                ) : (
+                  <div className="h-12 w-12 rounded-full bg-muted" />
+                )}
+                <div>
+                  <h3 className="font-medium">{store.name}</h3>
+                  <p className="text-xs text-muted-foreground">{store.category.name}</p>
+                </div>
+              </div>
+              <div className="flex items-center justify-between text-xs text-muted-foreground">
+                <span>⭐ {Number(store.rating_avg).toFixed(1)} ({store.rating_count})</span>
+                <span>{store.is_open ? "باز" : "بسته"}</span>
+              </div>
+              <div className="flex items-center justify-between text-xs">
+                <span>حداقل سفارش: {store.min_order_amount.toLocaleString("fa-IR")} تومان</span>
+                <span>ارسال: {store.delivery_fee.toLocaleString("fa-IR")} تومان</span>
+              </div>
+            </article>
+          ))}
+          {stores.length === 0 && <p className="text-sm text-muted-foreground">فروشگاهی یافت نشد.</p>}
+        </div>
+      </section>
+    </main>
+  );
+}

src/app/api/auth/logout/route.ts

@@ -0,0 +1,7 @@
+import { NextResponse } from "next/server";
+import { deleteSession } from "@/lib/auth/session";
+
+export async function POST() {
+  await deleteSession();
+  return NextResponse.json({ ok: true });
+}

src/app/api/auth/request-otp/route.ts

@@ -0,0 +1,21 @@
+import { NextResponse } from "next/server";
+import { requestOtp, GooyalAuthError } from "@/lib/auth/gooyal";
+
+export async function POST(request: Request) {
+  const body = await request.json().catch(() => null);
+  const phoneNumber = body?.phone_number;
+
+  if (!phoneNumber || typeof phoneNumber !== "string") {
+    return NextResponse.json({ message: "شماره موبایل الزامی است." }, { status: 400 });
+  }
+
+  try {
+    const result = await requestOtp(phoneNumber);
+    return NextResponse.json(result, { status: 201 });
+  } catch (err) {
+    if (err instanceof GooyalAuthError) {
+      return NextResponse.json({ message: err.message, code: err.code }, { status: err.status });
+    }
+    return NextResponse.json({ message: "سرویس احراز هویت در دسترس نیست." }, { status: 502 });
+  }
+}

src/app/api/auth/verify-otp/route.ts

@@ -0,0 +1,29 @@
+import { NextResponse } from "next/server";
+import { exchangeOtpForToken, GooyalAuthError } from "@/lib/auth/gooyal";
+import { createSession } from "@/lib/auth/session";
+
+export async function POST(request: Request) {
+  const body = await request.json().catch(() => null);
+  const phoneNumber = body?.phone_number;
+  const otp = body?.otp;
+
+  if (!phoneNumber || !otp) {
+    return NextResponse.json({ message: "شماره موبایل و کد تایید الزامی است." }, { status: 400 });
+  }
+
+  try {
+    const token = await exchangeOtpForToken(phoneNumber, otp);
+    await createSession({
+      accessToken: token.access_token,
+      refreshToken: token.refresh_token,
+      tokenType: token.token_type,
+      expiresAt: Date.now() + token.expires_in * 1000,
+    });
+    return NextResponse.json({ ok: true });
+  } catch (err) {
+    if (err instanceof GooyalAuthError) {
+      return NextResponse.json({ message: err.message, code: err.code }, { status: err.status });
+    }
+    return NextResponse.json({ message: "سرویس احراز هویت در دسترس نیست." }, { status: 502 });
+  }
+}

src/app/globals.css

@@ -1,26 +1,52 @@
 @import "tailwindcss";
 
+/*
+ * Placeholder tokens — TODO replace with real values pulled from the Figma
+ * design-system page (get_variable_defs) once file access is granted.
+ */
 :root {
   --background: #ffffff;
   --foreground: #171717;
+  --primary: #16a34a;
+  --primary-foreground: #ffffff;
+  --secondary: #f1f5f9;
+  --secondary-foreground: #171717;
+  --muted: #f1f5f9;
+  --muted-foreground: #6b7280;
+  --border: #e5e7eb;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
 }
 
 @theme inline {
   --color-background: var(--background);
   --color-foreground: var(--foreground);
-  --font-sans: var(--font-geist-sans);
-  --font-mono: var(--font-geist-mono);
+  --color-primary: var(--primary);
+  --color-primary-foreground: var(--primary-foreground);
+  --color-secondary: var(--secondary);
+  --color-secondary-foreground: var(--secondary-foreground);
+  --color-muted: var(--muted);
+  --color-muted-foreground: var(--muted-foreground);
+  --color-border: var(--border);
+  --color-destructive: var(--destructive);
+  --color-destructive-foreground: var(--destructive-foreground);
+  --font-sans: var(--font-vazirmatn);
 }
 
 @media (prefers-color-scheme: dark) {
   :root {
     --background: #0a0a0a;
     --foreground: #ededed;
+    --secondary: #1f2937;
+    --secondary-foreground: #ededed;
+    --muted: #1f2937;
+    --muted-foreground: #9ca3af;
+    --border: #27272a;
   }
 }
 
 body {
   background: var(--background);
   color: var(--foreground);
-  font-family: Arial, Helvetica, sans-serif;
+  font-family: var(--font-sans), system-ui, sans-serif;
 }

src/app/layout.tsx

@@ -1,29 +1,24 @@
 import type { Metadata } from "next";
-import { Geist, Geist_Mono } from "next/font/google";
+import { Vazirmatn } from "next/font/google";
 import "./globals.css";
+import { QueryProvider } from "@/lib/query-provider";
 
-const geistSans = Geist({
-  variable: "--font-geist-sans",
-  subsets: ["latin"],
-});
-
-const geistMono = Geist_Mono({
-  variable: "--font-geist-mono",
-  subsets: ["latin"],
+const vazirmatn = Vazirmatn({
+  variable: "--font-vazirmatn",
+  subsets: ["arabic"],
 });
 
 export const metadata: Metadata = {
-  title: "Create Next App",
-  description: "Generated by create next app",
+  title: "وینوفی",
+  description: "خرید آنلاین از فروشگاه‌های محله شما",
 };
 
 export default function RootLayout({ children }: LayoutProps<"/">) {
   return (
-    <html
-      lang="en"
-      className={`${geistSans.variable} ${geistMono.variable} h-full antialiased`}
-    >
-      <body className="min-h-full flex flex-col">{children}</body>
+    <html lang="fa" dir="rtl" className={`${vazirmatn.variable} h-full antialiased`}>
+      <body className="min-h-full flex flex-col bg-background text-foreground">
+        <QueryProvider>{children}</QueryProvider>
+      </body>
     </html>
   );
 }

src/app/page.tsx

@@ -1,69 +0,0 @@
-import Image from "next/image";
-
-export default function Home() {
-  return (
-    <div className="flex flex-col flex-1 items-center justify-center bg-zinc-50 font-sans dark:bg-black">
-      <main className="flex flex-1 w-full max-w-3xl flex-col items-center justify-between py-32 px-16 bg-white dark:bg-black sm:items-start">
-        <Image
-          className="dark:invert h-5 w-[100px]"
-          src="/next.svg"
-          alt="Next.js logo"
-          width={100}
-          height={20}
-          priority
-        />
-        <div className="flex flex-col items-center gap-6 text-center sm:items-start sm:text-left">
-          <h1 className="max-w-xs text-3xl font-semibold leading-10 tracking-tight text-black dark:text-zinc-50">
-            To get started, edit the{" "}
-            <code className="rounded bg-black/[.06] px-1.5 py-0.5 font-mono text-[0.9em] dark:bg-white/[.08]">
-              page.tsx
-            </code>{" "}
-            file.
-          </h1>
-          <p className="max-w-md text-lg leading-8 text-zinc-600 dark:text-zinc-400">
-            Looking for a starting point or more instructions? Head over to{" "}
-            <a
-              href="https://vercel.com/templates?framework=next.js&utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-              className="font-medium text-zinc-950 dark:text-zinc-50"
-            >
-              Templates
-            </a>{" "}
-            or the{" "}
-            <a
-              href="https://nextjs.org/learn?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-              className="font-medium text-zinc-950 dark:text-zinc-50"
-            >
-              Learning
-            </a>{" "}
-            center.
-          </p>
-        </div>
-        <div className="flex flex-col gap-4 text-base font-medium sm:flex-row">
-          <a
-            className="flex h-12 w-full items-center justify-center gap-2 rounded-full bg-foreground px-5 text-background transition-colors hover:bg-[#383838] dark:hover:bg-[#ccc] md:w-[158px]"
-            href="https://vercel.com/new?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-            target="_blank"
-            rel="noopener noreferrer"
-          >
-            <Image
-              className="dark:invert h-[14px] w-4"
-              src="/vercel.svg"
-              alt="Vercel logomark"
-              width={16}
-              height={14}
-            />
-            Deploy Now
-          </a>
-          <a
-            className="flex h-12 w-full items-center justify-center rounded-full border border-solid border-black/[.08] px-5 transition-colors hover:border-transparent hover:bg-black/[.04] dark:border-white/[.145] dark:hover:bg-[#1a1a1a] md:w-[158px]"
-            href="https://nextjs.org/docs?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-            target="_blank"
-            rel="noopener noreferrer"
-          >
-            Documentation
-          </a>
-        </div>
-      </main>
-    </div>
-  );
-}

src/components/ui/button.tsx

@@ -0,0 +1,39 @@
+import { Slot } from "@radix-ui/react-slot";
+import { cva, type VariantProps } from "class-variance-authority";
+import * as React from "react";
+import { cn } from "@/lib/utils/cn";
+
+const buttonVariants = cva(
+  "inline-flex items-center justify-center gap-2 rounded-xl text-sm font-medium transition-colors disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/40",
+  {
+    variants: {
+      variant: {
+        primary: "bg-primary text-primary-foreground hover:bg-primary/90",
+        secondary: "bg-secondary text-secondary-foreground hover:bg-secondary/80",
+        outline: "border border-border bg-transparent hover:bg-muted",
+        ghost: "bg-transparent hover:bg-muted",
+      },
+      size: {
+        default: "h-11 px-4",
+        sm: "h-9 px-3 text-xs",
+        lg: "h-12 px-6 text-base",
+        icon: "h-10 w-10",
+      },
+    },
+    defaultVariants: {
+      variant: "primary",
+      size: "default",
+    },
+  },
+);
+
+export interface ButtonProps
+  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
+    VariantProps<typeof buttonVariants> {
+  asChild?: boolean;
+}
+
+export function Button({ className, variant, size, asChild, ...props }: ButtonProps) {
+  const Comp = asChild ? Slot : "button";
+  return <Comp className={cn(buttonVariants({ variant, size, className }))} {...props} />;
+}

src/components/ui/input.tsx

@@ -0,0 +1,16 @@
+import * as React from "react";
+import { cn } from "@/lib/utils/cn";
+
+export const Input = React.forwardRef<HTMLInputElement, React.InputHTMLAttributes<HTMLInputElement>>(
+  ({ className, ...props }, ref) => (
+    <input
+      ref={ref}
+      className={cn(
+        "h-11 w-full rounded-xl border border-border bg-background px-4 text-sm placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/40",
+        className,
+      )}
+      {...props}
+    />
+  ),
+);
+Input.displayName = "Input";

src/lib/api/errors.ts

@@ -0,0 +1,31 @@
+/** Winofy error envelope, per FRONTEND_GUIDE.md §4.2 */
+export interface WinofyErrorDetails {
+  message: string | Record<string, string[]>;
+  error?: string;
+  timestamp?: string;
+}
+
+export class ApiError extends Error {
+  constructor(
+    public status: number,
+    public statusMessage: string,
+    public details: WinofyErrorDetails | null,
+  ) {
+    super(ApiError.extractMessage(details) ?? statusMessage);
+  }
+
+  private static extractMessage(details: WinofyErrorDetails | null): string | null {
+    if (!details) return null;
+    if (typeof details.message === "string") return details.message;
+    if (details.message && typeof details.message === "object") {
+      const first = Object.values(details.message)[0];
+      return Array.isArray(first) ? first[0] : null;
+    }
+    return null;
+  }
+
+  /** Field-level validation errors, if the envelope's message was keyed by field name. */
+  get fieldErrors(): Record<string, string[]> | null {
+    return this.details && typeof this.details.message === "object" ? this.details.message : null;
+  }
+}

src/lib/api/media.ts

@@ -0,0 +1,10 @@
+import "server-only";
+
+const API_ORIGIN = new URL(process.env.WINOFY_API_BASE_URL!).origin;
+
+/** Store/product image fields are `null` or an absolute/relative media URL — see FRONTEND_GUIDE.md §4.5. */
+export function resolveMediaUrl(path: string | null): string | null {
+  if (!path) return null;
+  if (path.startsWith("http://") || path.startsWith("https://")) return path;
+  return API_ORIGIN + (path.startsWith("/") ? path : `/${path}`);
+}

src/lib/api/winofy.ts

@@ -0,0 +1,84 @@
+import "server-only";
+import { getSession, createSession } from "@/lib/auth/session";
+import { refreshAccessToken } from "@/lib/auth/gooyal";
+import { ApiError, type WinofyErrorDetails } from "./errors";
+
+const BASE_URL = process.env.WINOFY_API_BASE_URL!;
+
+interface WinofyFetchOptions extends Omit<RequestInit, "body"> {
+  /** Attach the caller's bearer token. Defaults to true — set false for public endpoints. */
+  auth?: boolean;
+  params?: Record<string, string | number | boolean | undefined>;
+  body?: unknown;
+}
+
+async function getValidAccessToken(): Promise<string | null> {
+  const session = await getSession();
+  if (!session) return null;
+
+  // 30s skew so we don't hand out a token that expires mid-request.
+  if (Date.now() < session.expiresAt - 30_000) return session.accessToken;
+  if (!session.refreshToken) return session.accessToken;
+
+  try {
+    const refreshed = await refreshAccessToken(session.refreshToken);
+    await createSession({
+      accessToken: refreshed.access_token,
+      refreshToken: refreshed.refresh_token ?? session.refreshToken,
+      tokenType: refreshed.token_type,
+      expiresAt: Date.now() + refreshed.expires_in * 1000,
+    });
+    return refreshed.access_token;
+  } catch {
+    return null;
+  }
+}
+
+export interface PaginatedResponse<T> {
+  count: number;
+  next: string | null;
+  previous: string | null;
+  results: T[];
+}
+
+export async function winofyFetch<T>(path: string, options: WinofyFetchOptions = {}): Promise<T> {
+  const { auth = true, params, headers, body, ...rest } = options;
+
+  const url = new URL(BASE_URL.replace(/\/$/, "") + path);
+  if (params) {
+    for (const [key, value] of Object.entries(params)) {
+      if (value !== undefined) url.searchParams.set(key, String(value));
+    }
+  }
+
+  const finalHeaders = new Headers(headers);
+  const hasBody = body !== undefined;
+  if (hasBody && !finalHeaders.has("Content-Type")) {
+    finalHeaders.set("Content-Type", "application/json");
+  }
+
+  if (auth) {
+    const token = await getValidAccessToken();
+    if (token) finalHeaders.set("Authorization", `Bearer ${token}`);
+  }
+
+  const res = await fetch(url.toString(), {
+    ...rest,
+    headers: finalHeaders,
+    body: hasBody ? JSON.stringify(body) : undefined,
+    cache: "no-store",
+  });
+
+  if (res.status === 204) return undefined as T;
+
+  const data = await res.json().catch(() => null);
+
+  if (!res.ok) {
+    const envelope = data as { status_message?: string; details?: WinofyErrorDetails } | null;
+    throw new ApiError(res.status, envelope?.status_message ?? res.statusText, envelope?.details ?? null);
+  }
+
+  return data as T;
+}
+
+export { ApiError };

src/lib/auth/gooyal.ts

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+import "server-only";
+
+const ACCOUNTS_BASE_URL = process.env.GOOYAL_ACCOUNTS_BASE_URL!;
+const CLIENT_ID = process.env.GOOYAL_CLIENT_ID!;
+const CLIENT_SECRET = process.env.GOOYAL_CLIENT_SECRET!;
+const SCOPE = process.env.GOOYAL_OAUTH_SCOPE!;
+
+function basicAuthHeader() {
+  return "Basic " + Buffer.from(`${CLIENT_ID}:${CLIENT_SECRET}`).toString("base64");
+}
+
+const ERROR_MESSAGES_FA: Record<string, string> = {
+  invalid_grant: "کد تایید نامعتبر یا منقضی شده است.",
+  invalid_client: "خطا در پیکربندی سرویس احراز هویت. لطفاً بعداً تلاش کنید.",
+  invalid_request: "درخواست نامعتبر است.",
+  unsupported_grant_type: "خطا در پیکربندی سرویس احراز هویت.",
+};
+
+export class GooyalAuthError extends Error {
+  constructor(
+    public status: number,
+    public code: string,
+    description?: string,
+  ) {
+    super(ERROR_MESSAGES_FA[code] ?? description ?? code);
+  }
+}
+
+export interface RequestOtpResult {
+  phone_number: string;
+  otp_expire: string;
+  ttl: number;
+}
+
+export async function requestOtp(phoneNumber: string): Promise<RequestOtpResult> {
+  const res = await fetch(`${ACCOUNTS_BASE_URL}/users/api/request_otp/`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ phone_number: phoneNumber }),
+    cache: "no-store",
+  });
+  const data = await res.json().catch(() => ({}));
+  if (!res.ok) {
+    throw new GooyalAuthError(res.status, data.error ?? "request_otp_failed", data.error_description ?? data.detail);
+  }
+  return data;
+}
+
+export interface GooyalTokenResponse {
+  access_token: string;
+  refresh_token?: string;
+  token_type: string;
+  expires_in: number;
+  scope: string;
+}
+
+export async function exchangeOtpForToken(phoneNumber: string, otp: string): Promise<GooyalTokenResponse> {
+  const body = new URLSearchParams({
+    grant_type: "password",
+    username: phoneNumber,
+    password: otp,
+    scope: SCOPE,
+    auth_fields: "phone_number:otp",
+  });
+  const res = await fetch(`${ACCOUNTS_BASE_URL}/oauth2/token/`, {
+    method: "POST",
+    headers: {
+      Authorization: basicAuthHeader(),
+      "Content-Type": "application/x-www-form-urlencoded",
+    },
+    body: body.toString(),
+    cache: "no-store",
+  });
+  const data = await res.json().catch(() => ({}));
+  if (!res.ok) {
+    throw new GooyalAuthError(res.status, data.error ?? "token_exchange_failed", data.error_description);
+  }
+  return data;
+}
+
+export async function refreshAccessToken(refreshToken: string): Promise<GooyalTokenResponse> {
+  const body = new URLSearchParams({
+    grant_type: "refresh_token",
+    refresh_token: refreshToken,
+  });
+  const res = await fetch(`${ACCOUNTS_BASE_URL}/oauth2/token/`, {
+    method: "POST",
+    headers: {
+      Authorization: basicAuthHeader(),
+      "Content-Type": "application/x-www-form-urlencoded",
+    },
+    body: body.toString(),
+    cache: "no-store",
+  });
+  const data = await res.json().catch(() => ({}));
+  if (!res.ok) {
+    throw new GooyalAuthError(res.status, data.error ?? "refresh_failed", data.error_description);
+  }
+  return data;
+}

src/lib/auth/session.ts

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+import "server-only";
+import { EncryptJWT, jwtDecrypt } from "jose";
+import { cookies } from "next/headers";
+
+const secret = process.env.SESSION_SECRET;
+if (!secret) throw new Error("SESSION_SECRET is not set");
+const encodedKey = new Uint8Array(Buffer.from(secret, "base64"));
+
+const COOKIE_NAME = "winofy_session";
+
+export interface SessionTokens {
+  accessToken: string;
+  refreshToken?: string;
+  tokenType: string;
+  /** epoch ms */
+  expiresAt: number;
+}
+
+export async function createSession(tokens: SessionTokens) {
+  const jwe = await new EncryptJWT({ ...tokens })
+    .setProtectedHeader({ alg: "dir", enc: "A256GCM" })
+    .setIssuedAt()
+    .setExpirationTime("30d")
+    .encrypt(encodedKey);
+
+  const store = await cookies();
+  store.set(COOKIE_NAME, jwe, {
+    httpOnly: true,
+    secure: process.env.NODE_ENV === "production",
+    sameSite: "lax",
+    path: "/",
+    maxAge: 60 * 60 * 24 * 30,
+  });
+}
+
+export async function getSession(): Promise<SessionTokens | null> {
+  const store = await cookies();
+  const value = store.get(COOKIE_NAME)?.value;
+  if (!value) return null;
+  try {
+    const { payload } = await jwtDecrypt(value, encodedKey);
+    return payload as unknown as SessionTokens;
+  } catch {
+    return null;
+  }
+}
+
+export async function deleteSession() {
+  const store = await cookies();
+  store.delete(COOKIE_NAME);
+}
+
+export const SESSION_COOKIE_NAME = COOKIE_NAME;

src/lib/query-provider.tsx

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+"use client";
+
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { useState } from "react";
+
+export function QueryProvider({ children }: { children: React.ReactNode }) {
+  const [client] = useState(
+    () =>
+      new QueryClient({
+        defaultOptions: {
+          queries: {
+            staleTime: 30_000,
+            retry: 1,
+          },
+        },
+      }),
+  );
+
+  return <QueryClientProvider client={client}>{children}</QueryClientProvider>;
+}

src/lib/utils/cn.ts

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+import { clsx, type ClassValue } from "clsx";
+import { twMerge } from "tailwind-merge";
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs));
+}

src/proxy.ts

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+import { NextResponse } from "next/server";
+import type { NextRequest } from "next/server";
+import { SESSION_COOKIE_NAME } from "@/lib/auth/session";
+
+// Optimistic check only (cookie presence) — real authorization happens per-request
+// against the Winofy API, which is the source of truth. See FRONTEND_GUIDE.md §4.3.
+const AUTH_REQUIRED_PREFIXES = ["/seller", "/cart", "/checkout", "/orders", "/account", "/notifications"];
+
+export default function proxy(request: NextRequest) {
+  const { pathname } = request.nextUrl;
+  const hasSession = request.cookies.has(SESSION_COOKIE_NAME);
+  const needsAuth = AUTH_REQUIRED_PREFIXES.some((prefix) => pathname.startsWith(prefix));
+
+  if (needsAuth && !hasSession) {
+    const loginUrl = new URL("/login", request.url);
+    loginUrl.searchParams.set("next", pathname);
+    return NextResponse.redirect(loginUrl);
+  }
+
+  return NextResponse.next();
+}
+
+export const config = {
+  matcher: ["/((?!api|_next/static|_next/image|.*\\.(?:png|jpg|jpeg|svg|ico)$).*)"],
+};

src/types/api.ts

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+/** Shared API types mirrored from FRONTEND_GUIDE.md. Money fields are integer Toman. */
+
+export interface City {
+  uuid: string;
+  name: string;
+}
+
+export interface Neighborhood {
+  uuid: string;
+  name: string;
+  city: string;
+}
+
+export interface StoreCategory {
+  uuid: string;
+  name: string;
+  icon: string | null;
+  order: number;
+}
+
+export interface StoreListItem {
+  uuid: string;
+  name: string;
+  category: StoreCategory;
+  logo: string | null;
+  cover_image: string | null;
+  /** DRF serializes DecimalField as a string, e.g. "3.76" — confirmed against staging. */
+  rating_avg: string;
+  rating_count: number;
+  min_order_amount: number;
+  delivery_fee: number;
+  free_delivery_threshold: number | null;
+  is_open: boolean;
+}
+
+
+export interface WorkingHours {
+  weekday: 0 | 1 | 2 | 3 | 4 | 5 | 6; // 0 = Saturday .. 6 = Friday
+  opens_at: string;
+  closes_at: string;
+  is_closed: boolean;
+}
+
+export interface StoreDetail extends StoreListItem {
+  description: string;
+  address: string;
+  phone_number: string;
+  working_hours: WorkingHours[];
+  accepts_wallet: boolean;
+  accepts_online: boolean;
+  accepts_cash_on_delivery: boolean;
+}
+
+export type UnitType = "gram" | "ml" | "piece";
+
+export interface ProductCategory {
+  uuid: string;
+  name: string;
+  parent: string | null;
+}
+
+export interface ProductListItem {
+  uuid: string;
+  name: string;
+  image: string | null;
+  price: number;
+  unit_type: UnitType;
+  unit_value: number;
+  is_active: boolean;
+  is_out_of_stock: boolean;
+}
+
+export interface ProductDetail extends ProductListItem {
+  description: string;
+  category: ProductCategory;
+  store: StoreListItem;
+}
+
+export type AddressLabel = "home" | "work" | "other";
+
+export interface Address {
+  uuid: string;
+  label: AddressLabel;
+  title: string;
+  full_address: string;
+  plaque: string;
+  floor: string;
+  unit: string;
+  recipient_name: string;
+  recipient_phone: string;
+  city: City;
+  neighborhood: Neighborhood | null;
+  latitude: number;
+  longitude: number;
+  is_default: boolean;
+  created_at: string;
+}
+
+export interface CartItem {
+  uuid: string;
+  product: ProductListItem;
+  quantity: number;
+  line_total: number;
+}
+
+export interface CartGroup {
+  store: StoreListItem;
+  items: CartItem[];
+  items_subtotal: number;
+  delivery_fee: number;
+  total: number;
+  meets_minimum_order: boolean;
+}
+
+export interface Cart {
+  groups: CartGroup[];
+  grand_total: number;
+}
+
+export type DeliveryType = "express" | "scheduled";
+export type PaymentMethod = "wallet" | "online" | "cash_on_delivery";
+export type PaymentStatus = "pending" | "paid" | "failed";
+export type OrderStatus =
+  | "placed"
+  | "preparing"
+  | "ready_to_ship"
+  | "handed_to_courier"
+  | "delivered"
+  | "cancelled";
+
+export interface OrderItem {
+  uuid: string;
+  product: string;
+  product_name_snapshot: string;
+  unit_price_snapshot: number;
+  quantity: number;
+  line_total: number;
+}
+
+export interface OrderStatusLog {
+  from_status: string;
+  to_status: string;
+  note: string;
+  created_at: string;
+}
+
+export interface Order {
+  uuid: string;
+  store: StoreListItem;
+  status: OrderStatus;
+  items: OrderItem[];
+  items_subtotal: number;
+  delivery_fee: number;
+  commission_amount: number;
+  seller_payout_amount: number;
+  total_amount: number;
+  cancel_reason: string;
+  courier_name: string;
+  courier_phone: string;
+  placed_at: string;
+  delivered_at: string | null;
+  status_logs: OrderStatusLog[];
+  is_cancellable: boolean;
+}
+
+export interface OrderGroup {
+  uuid: string;
+  recipient_name: string;
+  recipient_phone: string;
+  full_address: string;
+  delivery_type: DeliveryType;
+  scheduled_at: string | null;
+  payment_method: PaymentMethod;
+  payment_status: PaymentStatus;
+  notes: string;
+  total_amount: number;
+  orders: Order[];
+  created_at: string;
+  /** `feature/payment` only. */
+  payment?: { method: PaymentMethod; status: string; payment_url?: string };
+}