'use client'

import { signIn } from 'next-auth/react'
import Link from 'next/link'
import { useRouter } from 'next/navigation'
import { useState } from 'react'

const inputClass =
  'w-full rounded-lg border border-gray-300 px-3 py-2 text-sm text-gray-900 shadow-sm focus:border-[color:var(--logo-color-dark)] focus:outline-none focus:ring-1 focus:ring-[color:var(--logo-color-dark)]'

export default function LoginForm({ defaultCallbackUrl }: { defaultCallbackUrl?: string }) {
  const router = useRouter()
  const callbackUrl =
    defaultCallbackUrl && defaultCallbackUrl.startsWith('/') ? defaultCallbackUrl : '/profil'

  const [email, setEmail] = useState('')
  const [password, setPassword] = useState('')
  const [error, setError] = useState<string | null>(null)
  const [loading, setLoading] = useState(false)

  async function onSubmit(e: React.FormEvent) {
    e.preventDefault()
    setError(null)
    setLoading(true)
    try {
      const res = await signIn('credentials', {
        email: email.trim(),
        password,
        redirect: false,
      })
      if (res?.error) {
        setError('Nieprawidłowy e-mail lub hasło.')
        setLoading(false)
        return
      }
      router.push(callbackUrl.startsWith('/') ? callbackUrl : '/profil')
      router.refresh()
    } catch {
      setError('Wystąpił błąd. Spróbuj ponownie.')
      setLoading(false)
    }
  }

  return (
    <div className="mx-auto w-full max-w-md rounded-2xl border border-gray-200 bg-white p-8 shadow-lg">
      <h1 className="text-2xl font-bold text-gray-900">Logowanie</h1>
      <p className="mt-1 text-sm text-gray-600">Zaloguj się na swoje konto.</p>

      <form onSubmit={onSubmit} className="mt-6 space-y-4">
        {error ? (
          <p className="rounded-lg bg-red-50 px-3 py-2 text-sm text-red-800" role="alert">
            {error}
          </p>
        ) : null}

        <div>
          <label htmlFor="login-email" className="mb-1 block text-sm font-medium text-gray-700">
            E-mail
          </label>
          <input
            id="login-email"
            name="email"
            type="email"
            autoComplete="email"
            required
            value={email}
            onChange={(e) => setEmail(e.target.value)}
            className={inputClass}
          />
        </div>

        <div>
          <label htmlFor="login-password" className="mb-1 block text-sm font-medium text-gray-700">
            Hasło
          </label>
          <input
            id="login-password"
            name="password"
            type="password"
            autoComplete="current-password"
            required
            value={password}
            onChange={(e) => setPassword(e.target.value)}
            className={inputClass}
          />
        </div>

        <button
          type="submit"
          disabled={loading}
          className="w-full rounded-lg bg-[color:var(--logo-color-dark)] py-2.5 text-sm font-semibold text-white shadow transition hover:opacity-95 disabled:opacity-60"
        >
          {loading ? 'Logowanie…' : 'Zaloguj się'}
        </button>
      </form>

      <p className="mt-6 text-center text-sm text-gray-600">
        Nie masz konta?{' '}
        <Link href="/rejestracja" className="font-medium text-[color:var(--logo-color-dark)] hover:underline">
          Zarejestruj się
        </Link>
      </p>
    </div>
  )
}