import { useState } from 'react'

export default function Login({ onLogin }) {
  const [user, setUser] = useState('')
  const [pass, setPass] = useState('')
  const [error, setError] = useState('')
  const [loading, setLoading] = useState(false)

  async function handleSubmit(e) {
    e.preventDefault()
    setError('')
    setLoading(true)
    try {
      await onLogin(user, pass)
    } catch {
      setError('Invalid username or password')
    } finally {
      setLoading(false)
    }
  }

  return (
    <div className="flex items-center justify-center h-screen bg-gray-50">
      <div className="bg-white border border-gray-200 rounded-lg p-8 w-80 shadow-sm">
        <h1 className="text-lg font-semibold text-gray-800 mb-6">Dataflow</h1>
        <form onSubmit={handleSubmit} className="space-y-4">
          <div>
            <label className="block text-xs text-gray-500 mb-1">Username</label>
            <input
              type="text"
              autoFocus
              value={user}
              onChange={e => setUser(e.target.value)}
              className="w-full border border-gray-200 rounded px-3 py-2 text-sm focus:outline-none focus:border-blue-400"
              required
            />
          </div>
          <div>
            <label className="block text-xs text-gray-500 mb-1">Password</label>
            <input
              type="password"
              value={pass}
              onChange={e => setPass(e.target.value)}
              className="w-full border border-gray-200 rounded px-3 py-2 text-sm focus:outline-none focus:border-blue-400"
              required
            />
          </div>
          {error && <p className="text-xs text-red-500">{error}</p>}
          <button
            type="submit"
            disabled={loading}
            className="w-full bg-blue-600 text-white rounded px-3 py-2 text-sm font-medium hover:bg-blue-700 disabled:opacity-50"
          >
            {loading ? 'Signing in…' : 'Sign in'}
          </button>
        </form>
      </div>
    </div>
  )
}