/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2013, Regents of the University of California
 *                     Yingdi Yu
 *
 * BSD license, See the LICENSE file for more information
 *
 * Author: Yingdi Yu <yingdi@cs.ucla.edu>
 */

#include "panel-policy-manager.h"

#include <ndn.cxx/security/certificate/identity-certificate.h>
#include <boost/bind.hpp>

#include "logging.h"

using namespace std;
using namespace ndn;
using namespace ndn::security;

INIT_LOGGER("PanelPolicyManager");

PanelPolicyManager::PanelPolicyManager(const int & stepLimit,
						 Ptr<CertificateCache> certificateCache)
  : m_stepLimit(stepLimit)
  , m_certificateCache(certificateCache)
  , m_localPrefixRegex(Ptr<Regex>(new Regex("^<local><ndn><prefix><><>$")))
{
  m_invitationDataSigningRule = Ptr<IdentityPolicyRule>(new IdentityPolicyRule("^<ndn><broadcast><chronos><invitation>([^<chatroom>]*)<chatroom>", 
        								"^([^<KEY>]*)<KEY><dsk-.*><ID-CERT><>$", 
        								"==", "\\1", "\\1", true));
  
  m_dskRule = Ptr<IdentityPolicyRule>(new IdentityPolicyRule("^([^<KEY>]*)<KEY><dsk-.*><ID-CERT><>$", 
							     "^([^<KEY>]*)<KEY>(<>*)<ksk-.*><ID-CERT>$", 
							     "==", "\\1", "\\1\\2", true));

  m_keyNameRegex = Ptr<Regex>(new Regex("^([^<KEY>]*)<KEY>(<>*<ksk-.*>)<ID-CERT>$", "\\1\\2"));

  m_signingCertificateRegex = Ptr<Regex>(new Regex("^<ndn><broadcast><chronos><invitation>([^<chatroom>]*)<chatroom>", "\\1"));
}

bool 
PanelPolicyManager::skipVerifyAndTrust (const Data & data)
{
  if(m_localPrefixRegex->match(data.getName()))
    return true;
  
  return false;
}

bool
PanelPolicyManager::requireVerify (const Data & data)
{
  // if(m_invitationDataRule->matchDataName(data))
  //   return true;

  if(m_dskRule->matchDataName(data))
    return true;

  return false;
}

Ptr<ValidationRequest>
PanelPolicyManager::checkVerificationPolicy(Ptr<Data> data, 
						 const int & stepCount, 
						 const DataCallback& verifiedCallback,
						 const UnverifiedCallback& unverifiedCallback)
{
  _LOG_DEBUG("checkVerificationPolicy");
  if(m_stepLimit == stepCount)
    {
      _LOG_DEBUG("reach the maximum steps of verification");
      unverifiedCallback(data);
      return NULL;
    }

  Ptr<const signature::Sha256WithRsa> sha256sig = boost::dynamic_pointer_cast<const signature::Sha256WithRsa> (data->getSignature());    

  if(KeyLocator::KEYNAME != sha256sig->getKeyLocator().getType())
    {
      unverifiedCallback(data);
      return NULL;
    }

  const Name & keyLocatorName = sha256sig->getKeyLocator().getKeyName();

  // if(m_invitationDataRule->satisfy(*data))
  //   {
  //     Ptr<const IdentityCertificate> trustedCert = m_certificateCache->getCertificate(keyLocatorName);
      
  //     if(NULL != trustedCert){
  //       if(verifySignature(*data, trustedCert->getPublicKeyInfo()))
  //         verifiedCallback(data);
  //       else
  //         unverifiedCallback(data);

  //       return NULL;
  //     }
  //     else{
  //       _LOG_DEBUG("KeyLocator has not been cached and validated!");

  //       DataCallback recursiveVerifiedCallback = boost::bind(&PanelPolicyManager::onCertificateVerified, 
  //       						     this, 
  //       						     _1, 
  //       						     data, 
  //       						     verifiedCallback, 
  //       						     unverifiedCallback);

  //       UnverifiedCallback recursiveUnverifiedCallback = boost::bind(&PanelPolicyManager::onCertificateUnverified, 
  //       							     this, 
  //       							     _1, 
  //       							     data, 
  //       							     unverifiedCallback);


  //       Ptr<Interest> interest = Ptr<Interest>(new Interest(sha256sig->getKeyLocator().getKeyName()));
	
  //       Ptr<ValidationRequest> nextStep = Ptr<ValidationRequest>(new ValidationRequest(interest, 
  //       									       recursiveVerifiedCallback,
  //       									       recursiveUnverifiedCallback,
  //       									       0,
  //       									       stepCount + 1)
  //       							 );
  //       return nextStep;
  //     }
  //   }

  if(m_dskRule->satisfy(*data))
    {
      m_keyNameRegex->match(keyLocatorName);
      Name keyName = m_keyNameRegex->expand();
      _LOG_DEBUG(keyName.toUri());

      if(m_trustAnchors.end() != m_trustAnchors.find(keyName))
        if(verifySignature(*data, m_trustAnchors[keyName]))
          verifiedCallback(data);
        else
          unverifiedCallback(data);
      else
        unverifiedCallback(data);

      return NULL;	
    }
  _LOG_DEBUG("Unverified!");

  unverifiedCallback(data);
  return NULL;
}

// void 
// PanelPolicyManager::onCertificateVerified(Ptr<Data> certData, 
// 					       Ptr<Data> originalData,
// 					       const DataCallback& verifiedCallback, 
// 					       const UnverifiedCallback& unverifiedCallback)
// {
//   IdentityCertificate certificate(*certData);

//   if(verifySignature(*originalData, certificate.getPublicKeyInfo()))
//     verifiedCallback(originalData);
//   else
//     unverifiedCallback(originalData);
// }

// void
// PanelPolicyManager::onCertificateUnverified(Ptr<Data> certData, 
// 						 Ptr<Data> originalData,
// 						 const UnverifiedCallback& unverifiedCallback)
// { unverifiedCallback(originalData); }

bool 
PanelPolicyManager::checkSigningPolicy(const Name & dataName, const Name & certificateName)
{
  return m_invitationDataSigningRule->satisfy(dataName, certificateName);
}

Name 
PanelPolicyManager::inferSigningIdentity(const Name & dataName)
{
  if(m_signingCertificateRegex->match(dataName))
    return m_signingCertificateRegex->expand();
  else
    return Name();
}

void
PanelPolicyManager::addTrustAnchor(const EndorseCertificate& selfEndorseCertificate)
{ 
  _LOG_DEBUG(selfEndorseCertificate.getPublicKeyName().toUri());
  m_trustAnchors.insert(pair <Name, Publickey > (selfEndorseCertificate.getPublicKeyName(), selfEndorseCertificate.getPublicKeyInfo())); 
}