case class UserInfo(account: String, password: String)

trait UserService {
    def getUserInfo(account: String): UserInfo
}

class UserServiceComponent extends UserService {
  def getUserInfo(account: String): UserInfo = UserInfo(account, "123")
}

case class LoginEnv(userName: String, password: String, service: UserService)

object LoginFacade {
  val login = Reader[LoginEnv, Boolean] { loginEnvironment =>
      loginEnvironment.service.getUserInfo(loginEnvironment.userName).password == loginEnvironment.password
  }
}

object HomeController {
  val autenticarUsuario = LoginFacade.login.tapWith { (loginEnv, isAuthorized) =>
    if (isAuthorized) {
      s"Olá, ${loginEnv.userName}"
    } else {
      "Erro de login"
    }
  }
}

object ReaderMonadInjection extends App {
  val userService = new UserServiceComponent()
  val loginEnvironment = new LoginEnv("Rodrigo", "123", userService)

  val loginMessage = HomeController.autenticarUsuario.run(loginEnvironment)

  println(loginMessage)
}