'use client'

import { useState } from 'react'
import { createAuthClient } from 'better-auth/react'
import { magicLinkClient } from 'better-auth/client/plugins'

const authClient = createAuthClient({
  baseURL: process.env.NEXT_PUBLIC_APP_URL ?? 'http://localhost:3000',
  plugins: [magicLinkClient()],
})

export default function LoginPage() {
  const [email, setEmail] = useState('')
  const [sent, setSent] = useState(false)
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState('')

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault()
    setLoading(true)
    setError('')

    const result = await authClient.signIn.magicLink({
      email,
      callbackURL: '/dashboard',
    })

    setLoading(false)
    if (result.error) {
      setError(result.error.message ?? 'Ein Fehler ist aufgetreten.')
    } else {
      setSent(true)
    }
  }

  return (
    <div className="min-h-screen bg-gray-50 flex items-center justify-center p-4">
      <div className="w-full max-w-md">
        {/* Logo */}
        <div className="text-center mb-8">
          <div className="inline-flex items-center justify-center w-16 h-16 bg-brand-500 rounded-2xl mb-4">
            <span className="text-white font-bold text-2xl">I</span>
          </div>
          <h1 className="text-2xl font-bold text-gray-900">InnungsApp Admin</h1>
          <p className="text-gray-500 mt-1">Verwaltungsportal für Innungen</p>
        </div>

        <div className="bg-white rounded-2xl shadow-sm border p-8">
          {sent ? (
            <div className="text-center">
              <div className="w-16 h-16 bg-green-100 rounded-full flex items-center justify-center mx-auto mb-4">
                <svg className="w-8 h-8 text-green-500" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 8l7.89 5.26a2 2 0 002.22 0L21 8M5 19h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z" />
                </svg>
              </div>
              <h2 className="text-xl font-semibold text-gray-900 mb-2">
                E-Mail gesendet!
              </h2>
              <p className="text-gray-500">
                Wir haben einen Login-Link an <strong>{email}</strong> gesendet.
                Bitte überprüfen Sie Ihr Postfach.
              </p>
              <button
                onClick={() => setSent(false)}
                className="mt-6 text-brand-600 text-sm hover:underline"
              >
                Andere E-Mail verwenden
              </button>
            </div>
          ) : (
            <>
              <h2 className="text-xl font-semibold text-gray-900 mb-6">
                Anmelden
              </h2>
              <form onSubmit={handleSubmit} className="space-y-4">
                <div>
                  <label
                    htmlFor="email"
                    className="block text-sm font-medium text-gray-700 mb-1"
                  >
                    E-Mail-Adresse
                  </label>
                  <input
                    id="email"
                    type="email"
                    required
                    value={email}
                    onChange={(e) => setEmail(e.target.value)}
                    placeholder="admin@ihre-innung.de"
                    className="w-full px-4 py-2.5 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-brand-500 focus:border-transparent"
                  />
                </div>

                {error && (
                  <p className="text-sm text-red-600 bg-red-50 px-4 py-2 rounded-lg">
                    {error}
                  </p>
                )}

                <button
                  type="submit"
                  disabled={loading}
                  className="w-full bg-brand-500 text-white py-2.5 px-4 rounded-lg font-medium hover:bg-brand-600 disabled:opacity-60 disabled:cursor-not-allowed transition-colors"
                >
                  {loading ? 'Wird gesendet...' : 'Magic Link senden'}
                </button>
              </form>

              <p className="mt-4 text-center text-sm text-gray-500">
                Kein Passwort nötig — Sie erhalten einen Link per E-Mail.
              </p>
            </>
          )}
        </div>
      </div>
    </div>
  )
}