import { useState, type FormEvent } from 'react'
import { login, ErrorLogin, type UsuarioSesion } from '../services/auth'

/** Pantalla de login NovaSpark: marca FRASA, usuario + contraseña, Enter envía */
export default function LoginScreen({ onLogin }: { onLogin: (usuario: UsuarioSesion) => void }) {
  const [username, setUsername] = useState('')
  const [password, setPassword] = useState('')
  const [error, setError] = useState<string | null>(null)
  const [cargando, setCargando] = useState(false)

  async function enviar(e: FormEvent) {
    e.preventDefault()
    setError(null)
    setCargando(true)
    try {
      onLogin(await login(username, password))
    } catch (err) {
      setError(err instanceof ErrorLogin ? err.message : 'Usuario o contraseña incorrectos')
    } finally {
      setCargando(false)
    }
  }

  return (
    <div className="flex min-h-screen items-center justify-center bg-[#F8FAFC] px-4">
      <div className="w-full max-w-sm rounded-xl border border-[#E5E7EB] bg-white p-8 shadow-sm">
        <div className="mb-8 text-center">
          <p className="text-lg font-bold tracking-wide">
            FRASA<span className="text-[#F97316]">.</span>
          </p>
          <p className="mt-2 text-xs font-medium text-[#64748B]">
            Acceso al ecosistema
          </p>
        </div>
        <form onSubmit={enviar} className="space-y-6">
          <div>
            <label
              htmlFor="login-usuario"
              className="mb-2 block text-xs font-medium text-[#4B5563]"
            >
              Usuario
            </label>
            <input
              id="login-usuario"
              type="text"
              value={username}
              onChange={(e) => setUsername(e.target.value)}
              autoComplete="username"
              autoFocus
              required
              className="w-full rounded-lg border border-[#D1D5DB] bg-white px-3 py-2.5 text-sm transition-colors focus:border-accent focus:ring-2 focus:ring-accent/20 focus:outline-none"
            />
          </div>
          <div>
            <label
              htmlFor="login-password"
              className="mb-2 block text-xs font-medium text-[#4B5563]"
            >
              Contraseña
            </label>
            <input
              id="login-password"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              autoComplete="current-password"
              required
              className="w-full rounded-lg border border-[#D1D5DB] bg-white px-3 py-2.5 text-sm transition-colors focus:border-accent focus:ring-2 focus:ring-accent/20 focus:outline-none"
            />
          </div>
          {error && (
            <p
              role="alert"
              className="rounded-lg bg-red-50 px-4 py-3 text-xs font-medium text-red-700"
            >
              {error}
            </p>
          )}
          <button
            type="submit"
            disabled={cargando}
            className="w-full rounded-lg bg-accent px-5 py-2.5 text-sm font-medium text-white shadow-sm transition-all duration-100 ease-out hover:bg-accent-hover disabled:opacity-50"
          >
            {cargando ? 'Entrando…' : 'Entrar'}
          </button>
        </form>
      </div>
    </div>
  )
}