/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
 * Copyright (C) 2013 Regents of the University of California.
 * @author: Yingdi Yu <yingdi@cs.ucla.edu>
 * See COPYING for copyright and distribution information.
 */

#ifndef NDN_SECURITY_CONF_RULE_HPP
#define NDN_SECURITY_CONF_RULE_HPP

#include "filter.hpp"
#include "checker.hpp"


namespace ndn {
namespace security {
namespace conf {

template<class Packet>
class Rule
{
public:
  Rule(const std::string& id)
    : m_id(id)
  {
  }

  virtual
  ~Rule()
  {
  }

  const std::string&
  getId()
  {
    return m_id;
  }

  void
  addFilter(const shared_ptr<Filter>& filter)
  {
    m_filters.push_back(filter);
  }

  void
  addChecker(const shared_ptr<Checker>& checker)
  {
    m_checkers.push_back(checker);
  }

  bool
  match(const Packet& packet)
  {
    if (m_filters.empty())
      return true;

    for (FilterList::iterator it = m_filters.begin();
         it != m_filters.end(); it++)
      {
        if (!(*it)->match(packet))
          return false;
      }

    return true;
  }

  /**
   * @brief check if packet satisfies certain condition
   *
   * @param packet The packet
   * @param onValidated Callback function which is called when packet is immediately valid
   * @param onValidationFailed Call function which is called when packet is immediately invalid
   * @return -1 if packet is immediately invalid (onValidationFailed has been called)
   *          1 if packet is immediately valid (onValidated has been called)
   *          0 if further signature verification is needed.
   */
  template<class ValidatedCallback, class ValidationFailureCallback>
  int8_t
  check(const Packet& packet,
        const ValidatedCallback& onValidated,
        const ValidationFailureCallback& onValidationFailed)
  {
    for (CheckerList::iterator it = m_checkers.begin();
         it != m_checkers.end(); it++)
      {
        int8_t result = (*it)->check(packet, onValidated, onValidationFailed);
        if (result >= 0)
          return result;
      }
    return -1;
  }

private:
  typedef std::vector<shared_ptr<Filter> > FilterList;
  typedef std::vector<shared_ptr<Checker> > CheckerList;

  std::string m_id;
  FilterList m_filters;
  CheckerList m_checkers;
};

} // namespace conf
} // namespace security
} // namespace ndn

#endif // NDN_SECURITY_CONF_RULE_HPP