beachPartyBalloons/estore/src/app/admin/login/page.tsx

'use client'
import { BASE } from '@/lib/basepath'

import { useState } from 'react'
import { useRouter } from 'next/navigation'
import type { Metadata } from 'next'

export default function AdminLoginPage() {
  const router = useRouter()
  const [password, setPassword] = useState('')
  const [error, setError]       = useState('')
  const [loading, setLoading]   = useState(false)

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault()
    setLoading(true)
    setError('')
    const res = await fetch(BASE + '/api/admin/login', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ password }),
    })
    if (res.ok) {
      router.push('/admin')
    } else {
      setError('Invalid password')
      setLoading(false)
    }
  }

  return (
    <section className="section">
      <div className="container" style={{ maxWidth: 400 }}>
        <h1 className="title is-4" style={{ marginBottom: '1.5rem' }}>Admin Login</h1>
        <form onSubmit={handleSubmit}>
          <div className="field">
            <div className="control">
              <input
                className="input"
                type="password"
                placeholder="Password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                autoFocus
                required
              />
            </div>
          </div>
          {error && <p className="help is-danger">{error}</p>}
          <div className="field" style={{ marginTop: '1rem' }}>
            <button className={`button is-dark is-fullwidth${loading ? ' is-loading' : ''}`} type="submit">
              Sign in
            </button>
          </div>
        </form>
      </div>
    </section>
  )
}