"use client";
import React, { Suspense, useMemo, useState } from "react";
import { Navbar } from "@/components/layout/Navbar";
import { Footer } from "@/components/layout/Footer";
import { apiFetch } from "@/lib/api";
import { useSearchParams, useRouter } from "next/navigation";
import { appName } from "@/lib/siteConfig";

function ActivateAccountContent() {
  const search = useSearchParams();
  const router = useRouter();
  const token = search.get("token") || "";
  const [password, setPassword] = useState("");
  const [confirm, setConfirm] = useState("");
  const [status, setStatus] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);

  const canSubmit = useMemo(() => password.length >= 8 && password === confirm && !!token, [password, confirm, token]);

  const submit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!canSubmit) return;
    try {
      setLoading(true);
      setStatus(null);
      const data = await apiFetch<any>("/api/users/activate", { method: "POST", body: { token, password } });
      // Auto-login: save token and redirect to dashboard
      if (data?.token) {
        localStorage.setItem("token", data.token);
      }
      setStatus("Your account is now active. Redirecting…");
      setTimeout(() => router.push("/dashboard"), 1500);
    } catch (err: any) {
      setStatus(err?.message || "Activation failed. The link may have expired.");
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen flex flex-col">
      <Navbar />
      <main className="flex-1 px-4 py-10 max-w-md mx-auto w-full">
        <div className="border rounded-xl p-6 bg-white shadow-sm">
          <h1 className="text-2xl font-semibold mb-2">Activate your account</h1>
          <p className="text-gray-500 text-sm mb-5">Set a password to activate your {appName} account.</p>
          {!token && <p className="text-red-600 mb-4">Missing or invalid activation link.</p>}
          <form onSubmit={submit} className="space-y-4">
            <div>
              <label className="block text-sm font-medium mb-1">Password</label>
              <input type="password" value={password} onChange={e => setPassword(e.target.value)} required className="w-full border rounded px-3 py-2" />
              <p className="text-xs text-gray-500 mt-1">At least 8 characters.</p>
            </div>
            <div>
              <label className="block text-sm font-medium mb-1">Confirm Password</label>
              <input type="password" value={confirm} onChange={e => setConfirm(e.target.value)} required className="w-full border rounded px-3 py-2" />
            </div>
            {password && confirm && password !== confirm && (
              <p className="text-xs text-red-600">Passwords do not match.</p>
            )}
            <button disabled={loading || !canSubmit} className="px-4 py-2 rounded bg-blue-600 text-white disabled:opacity-60 w-full py-2.5 font-medium">
              {loading ? "Activating…" : "Activate my account"}
            </button>
          </form>
          {status && <p className="text-sm text-gray-700 mt-4">{status}</p>}
        </div>
      </main>
      <Footer />
    </div>
  );
}

export default function ActivateAccountPage() {
  return (
    <Suspense fallback={<div className="p-6">Loading...</div>}>
      <ActivateAccountContent />
    </Suspense>
  );
}