/* -*- 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>
 * @author: Jeff Thompson <jefft0@remap.ucla.edu>
 * See COPYING for copyright and distribution information.
 */

#include "common.hpp"

#include "identity-certificate.hpp"

using namespace std;

namespace ndn {

bool
IdentityCertificate::isCorrectName(const Name& name)
{
  string idString("ID-CERT");
  int i = name.size() - 1;
  for (; i >= 0; i--) {
    if(name.get(i).toEscapedString() == idString)
      break;
  }

  if (i < 0)
    return false;
  
  size_t keyIdx = 0;
  string keyString("KEY");
  for (; keyIdx < name.size(); keyIdx++) {
    if(name.get(keyIdx).toEscapedString() == keyString)
      break;
  }

  if (keyIdx >= name.size())
    return false;

  return true;
}

void
IdentityCertificate::setPublicKeyName()
{
  if (!isCorrectName(getName()))
    throw Error("Wrong Identity Certificate Name!");
  
  publicKeyName_ = certificateNameToPublicKeyName(getName());
}

bool
IdentityCertificate::isIdentityCertificate(const Certificate& certificate)
{
  return dynamic_cast<const IdentityCertificate*>(&certificate);
}

Name
IdentityCertificate::certificateNameToPublicKeyName(const Name& certificateName)
{
  string idString("ID-CERT");
  bool foundIdString = false;
  size_t idCertComponentIndex = certificateName.size() - 1;
  for (; idCertComponentIndex + 1 > 0; --idCertComponentIndex) {
    if (certificateName.get(idCertComponentIndex).toEscapedString() == idString)
      {
        foundIdString = true;
        break;
      }
  }

  if(!foundIdString)
    throw Error("Incorrect identity certificate name " + certificateName.toUri());
    
  Name tmpName = certificateName.getSubName(0, idCertComponentIndex);
  string keyString("KEY");
  bool foundKeyString = false;
  size_t keyComponentIndex = 0;
  for (; keyComponentIndex < tmpName.size(); keyComponentIndex++) {
    if (tmpName.get(keyComponentIndex).toEscapedString() == keyString)
      {
        foundKeyString = true;
        break;
      }
  }

  if(!foundKeyString)
    throw Error("Incorrect identity certificate name " + certificateName.toUri());

  return tmpName
           .getSubName(0, keyComponentIndex)
           .append(tmpName.getSubName(keyComponentIndex + 1,
                                      tmpName.size() - keyComponentIndex - 1));
}

} // namespace ndn