"use client";

import { useEffect, useRef, useState } from "react";
import { useRouter, useSearchParams } from "next/navigation";
import { useAuth } from "@/context/AuthContext";

export default function BetaMagicPage() {
  const params = useSearchParams();
  const token = params.get("token");
  const router = useRouter();
  const { setSession } = useAuth();
    const ran = useRef(false);

  const [status, setStatus] = useState<"loading" | "success" | "error">("loading");
  const [message, setMessage] = useState("Signing you in…");

  useEffect(() => {
    if (!token) {
      setStatus("error");
      setMessage("Missing token.");
      return;
    }

    // ✅ Prevent double-call (Strict Mode / rerenders)
    if (ran.current) return;
    ran.current = true;

    (async () => {
      try {
        const res = await fetch(`${process.env.NEXT_PUBLIC_API_BASE_URL ?? "http://localhost:8080"}/api/auth/magic/exchange`, {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ token }),
        });

        if (!res.ok) {
          const text = await res.text().catch(() => "");
          throw new Error(text || "Magic link failed");
        }

        const data = await res.json();

        // Your AuthContext expects { token, email, displayName, role }
        // and stores it in localStorage.
        // We can simulate "login" by directly setting localStorage like AuthContext does,
        // but easiest is just to store it here in the same shape.
        setSession(data.token ?? data.accessToken, {
            email: data.email,
            displayName: data.displayName ?? null,
            role: data.role ?? "USER",
          });

        setStatus("success");
        setMessage("You’re in. Redirecting…");
        router.replace("/builder");
      } catch (e: any) {
        setStatus("error");
        setMessage(e?.message || "Magic link expired. Request a new one.");
      }
    })();
}, [token, router, setSession]);

  return (
    <main className="min-h-screen bg-black text-zinc-50 flex items-center justify-center px-4">
      <div className="max-w-md w-full rounded-xl border border-white/10 bg-white/5 p-6">
        <h1 className="text-lg font-semibold">Battl Builders</h1>
        <p className="mt-2 text-sm text-zinc-300">{message}</p>

        {status === "error" && (
          <div className="mt-4 text-xs text-zinc-400">
            Try going back to your inbox and requesting a fresh sign-in link.
          </div>
        )}
      </div>
    </main>
  );
}