"use client";

import { useRouter } from "next/navigation";
import { useState } from "react";

export default function RegisterPage() {
  const router = useRouter();
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [name, setName] = useState("");
  const [error, setError] = useState<string | null>(null);

  async function onSubmit(e: React.FormEvent) {
    e.preventDefault();
    setError(null);
    const res = await fetch("/api/auth/register", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ email, password, name }),
    });
    if (!res.ok) {
      const body = (await res.json().catch(() => ({}))) as { error?: string };
      setError(body.error ?? "가입 실패");
      return;
    }
    router.push("/login");
  }

  return (
    <main className="mx-auto flex min-h-screen max-w-md flex-col justify-center gap-6 px-6">
      <h1 className="text-2xl font-bold">회원가입</h1>
      <form onSubmit={onSubmit} className="flex flex-col gap-3">
        <input
          type="email"
          required
          placeholder="email"
          value={email}
          onChange={(e) => setEmail(e.target.value)}
          className="rounded border px-3 py-2"
        />
        <input
          type="text"
          placeholder="name (optional)"
          value={name}
          onChange={(e) => setName(e.target.value)}
          className="rounded border px-3 py-2"
        />
        <input
          type="password"
          required
          minLength={8}
          placeholder="password (>= 8 chars)"
          value={password}
          onChange={(e) => setPassword(e.target.value)}
          className="rounded border px-3 py-2"
        />
        <button
          type="submit"
          className="rounded bg-gray-900 px-4 py-2 text-white"
        >
          Register
        </button>
        {error != null && <p className="text-sm text-red-600">{error}</p>}
      </form>
    </main>
  );
}