4．ログイン

import { useState } from "react";
import { useRouter } from "next/router";
import { supabase } from "../lib/supabaseClient";

export default function Login() {
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [message, setMessage] = useState("");
  const router = useRouter();

  const handleLogin = async(e) => {
    e.preventDefault();
    const { error } = await supabase.auth.signInWithPassword({ email, password });
    if (error) {
      setMessage(error.message);
    } else {
      router.push("/mypage");
    }
  };

  return (
    <>
      <p>{message}</p>
      <form onSubmit={handleLogin}>
        <input
          type="email"
          placeholder="メールアドレス"
          value={email}
          onChange={(e) => setEmail(e.target.value)}
        />
        <input
          type="password"
          placeholder="パスワード"
          value={password}
          onChange={(e) => setPassword(e.target.value)}
        />
        <button type="submit">ログイン</button>
      </form>
    </>
  );
}