/**
 * # 路由 /my-account 账户页（Tailwind + shadcn/ui 实现）
 * 未登录：登录 / 注册两个 Tab 表单；已登录：资料卡 + 订单列表 + 退出登录。
 */
import { createFileRoute, Link, useRouter } from "@tanstack/react-router";
import { useState } from "react";
import { getCurrentUser, loginFn, registerFn, logoutFn } from "~/server/auth";
import { useT } from "~/i18n";
import { getMyOrders } from "~/server/commerce";
import { getLayoutData, Layout } from "~/components/website/Layout";
import { Badge } from "~/components/ui/badge";
import { Button } from "~/components/ui/button";
import { Input } from "~/components/ui/input";
import { Label } from "~/components/ui/label";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "~/components/ui/tabs";

export const Route = createFileRoute("/my-account")({
  loader: async () => {
    const user = await getCurrentUser();
    const [layout, orders] = await Promise.all([getLayoutData(), user ? getMyOrders() : Promise.resolve([])]);
    return { layout, user, orders };
  },
  head: () => ({ meta: [{ title: "My Account - DusunIoT" }] }),
  component: MyAccountPage,
});

/** # 函数 组件 账户页面（外壳：公共布局） */
function MyAccountPage() {
  const { layout } = Route.useLoaderData();
  return (
    <Layout layout={layout}>
      <AccountInner />
    </Layout>
  );
}

/** # 函数 组件 账户内容区 */
function AccountInner() {
  const t = useT();
  const { user, orders } = Route.useLoaderData();
  const router = useRouter();

  /** # 函数 退出登录 */
  async function handleLogout() {
    await logoutFn();
    router.invalidate();
  }

  if (!user) {
    return (
      <div className="site-container">
        <h1 className="mt-5 mb-3.5 text-[26px]">My Account</h1>
        <div className="max-w-[520px] rounded-lg border border-line bg-soft p-5">
          <Tabs defaultValue="login">
            <TabsList>
              <TabsTrigger value="login">{t("acct_login")}</TabsTrigger>
              <TabsTrigger value="register">{t("acct_register")}</TabsTrigger>
            </TabsList>
            <TabsContent value="login">
              <LoginForm onDone={() => router.invalidate()} />
            </TabsContent>
            <TabsContent value="register">
              <RegisterForm onDone={() => router.invalidate()} />
            </TabsContent>
          </Tabs>
        </div>
      </div>
    );
  }

  return (
    <div className="site-container">
      <h1 className="mt-5 mb-3.5 text-[26px]">My Account</h1>
      <div className="mb-5 rounded-lg border border-line bg-soft p-5">
        <h3 className="mt-0">Profile</h3>
        <p className="m-0">
          <strong>{user.displayName || user.email}</strong> ({user.email}) — role: {user.role}
          <button className="ml-3.5 cursor-pointer border-0 bg-none text-[13px] text-muted-foreground underline hover:text-[#b91c1c]" onClick={() => void handleLogout()} type="button">
            Log out
          </button>
        </p>
      </div>
      <h2>{t("acct_recent_orders")}</h2>
      {orders.length === 0 ? (
        <div className="py-[60px] text-center text-muted-foreground">
          <p>{t("acct_no_orders")}</p>
          <Button asChild>
            <Link to="/shop/">{t("checkout_browse")}</Link>
          </Button>
        </div>
      ) : (
        <table className="w-full border-collapse bg-white text-sm">
          <thead>
            <tr>
              {(["acct_th_order", "acct_th_date", "acct_th_items", "acct_th_total", "acct_th_status", "acct_th_payment"] as const).map((k) => (
                <th key={k} className="border-b border-line bg-soft px-3 py-2.5 text-left font-semibold">
                  {t(k)}
                </th>
              ))}
            </tr>
          </thead>
          <tbody>
            {orders.map((o) => (
              <tr key={o.id}>
                <td className="border-b border-line px-3 py-2.5 text-left">
                  <strong>{o.orderNumber}</strong>
                </td>
                <td className="border-b border-line px-3 py-2.5 text-left">{o.createdAt ? new Date(o.createdAt).toLocaleDateString("en-US") : "-"}</td>
                <td className="border-b border-line px-3 py-2.5 text-left">{Number(o.itemCount)}</td>
                <td className="border-b border-line px-3 py-2.5 text-left">${Number(o.total).toFixed(2)}</td>
                <td className="border-b border-line px-3 py-2.5 text-left">
                  <Badge variant={o.status === "completed" ? "success" : "default"}>{o.status}</Badge>
                </td>
                <td className="border-b border-line px-3 py-2.5 text-left">
                  <Badge variant={o.paymentStatus === "paid" ? "success" : "warning"}>{o.paymentStatus}</Badge>
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      )}
    </div>
  );
}

/** # 组件 登录表单 */
function LoginForm({ onDone }: { onDone: () => void }) {
  const t = useT();
  const [authError, setAuthError] = useState("");

  /** # 函数 登录提交 */
  async function handleLogin(e: React.FormEvent<HTMLFormElement>) {
    e.preventDefault();
    setAuthError("");
    const fd = new FormData(e.currentTarget);
    const res = await loginFn({ data: { email: String(fd.get("email") ?? ""), password: String(fd.get("password") ?? "") } });
    if (!res.ok) return setAuthError(res.error);
    onDone();
  }

  return (
    <form className="grid grid-cols-1 gap-3.5" onSubmit={handleLogin}>
      {authError ? <p className="m-0 rounded-md border border-[#f3c1c1] bg-[#fdeaea] px-4 py-3 text-[#b91c1c]">{authError}</p> : null}
      <Label className="col-span-full">
        Email
        <Input name="email" type="email" required autoComplete="email" />
      </Label>
      <Label className="col-span-full">
        Password
        <Input name="password" type="password" required autoComplete="current-password" />
      </Label>
      <div className="col-span-full">
        <Button type="submit">{t("acct_login")}</Button>
      </div>
    </form>
  );
}

/** # 组件 注册表单 */
function RegisterForm({ onDone }: { onDone: () => void }) {
  const [authError, setAuthError] = useState("");

  /** # 函数 注册提交 */
  async function handleRegister(e: React.FormEvent<HTMLFormElement>) {
    e.preventDefault();
    setAuthError("");
    const fd = new FormData(e.currentTarget);
    const res = await registerFn({
      data: {
        email: String(fd.get("email") ?? ""),
        password: String(fd.get("password") ?? ""),
        displayName: String(fd.get("displayName") ?? "") || undefined,
      },
    });
    if (!res.ok) return setAuthError(res.error);
    onDone();
  }

  return (
    <form className="grid grid-cols-1 gap-3.5" onSubmit={handleRegister}>
      {authError ? <p className="m-0 rounded-md border border-[#f3c1c1] bg-[#fdeaea] px-4 py-3 text-[#b91c1c]">{authError}</p> : null}
      <Label>
        Display name (optional)
        <Input name="displayName" type="text" />
      </Label>
      <Label>
        Email
        <Input name="email" type="email" required autoComplete="email" />
      </Label>
      <Label>
        Password (min 8 chars)
        <Input name="password" type="password" required minLength={8} autoComplete="new-password" />
      </Label>
      <div>
        <Button type="submit" variant="outline">
          Register
        </Button>
      </div>
    </form>
  );
}