/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2013-2014 Regents of the University of California.
 *
 * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
 *
 * ndn-cxx library is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 *
 * You should have received copies of the GNU General Public License and GNU Lesser
 * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
 *
 * @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
 * @author Jeff Thompson <jefft0@remap.ucla.edu>
 */

#ifndef NDN_SECURITY_SEC_PUBLIC_INFO_HPP
#define NDN_SECURITY_SEC_PUBLIC_INFO_HPP

#include "../name.hpp"
#include "security-common.hpp"
#include "public-key.hpp"
#include "identity-certificate.hpp"


namespace ndn {

/**
 * @brief SecPublicInfo is a base class for the storage of public information.
 *
 * It specify interfaces related to public information, such as identity, public keys and
 * certificates.
 */
class SecPublicInfo : noncopyable
{
public:
  class Error : public std::runtime_error
  {
  public:
    explicit
    Error(const std::string& what)
      : std::runtime_error(what)
    {
    }
  };

  /**
   * @brief The virtual Destructor
   */
  virtual
  ~SecPublicInfo()
  {
  }

  /**
   * @brief Check if the specified identity already exists
   *
   * @param identityName The identity name
   * @return true if the identity exists, otherwise false
   */
  virtual bool
  doesIdentityExist(const Name& identityName) = 0;

  /**
   * @brief Add a new identity
   *
   * if identity already exist, do not add it again
   *
   * @param identityName The identity name to be added
   */
  virtual void
  addIdentity(const Name& identityName) = 0;

  /**
   * @brief Revoke the identity
   *
   * @return true if the identity was revoked, otherwise false
   */
  virtual bool
  revokeIdentity() = 0;

  /**
   * @brief Check if the specified key already exists
   *
   * @param keyName The name of the key
   * @return true if the key exists, otherwise false
   */
  virtual bool
  doesPublicKeyExist(const Name& keyName) = 0;

  /**
   * @brief Add a public key to the identity storage.
   *
   * @deprecated Use addKey instead
   *
   * @param keyName The name of the public key to be added
   * @param keyType Type of the public key to be added
   * @param publicKey Reference to the PublicKey object
   */
  void
  addPublicKey(const Name& keyName, KeyType keyType, const PublicKey& publicKey)
  {
    addKey(keyName, publicKey);
  }

  /**
   * @brief Add a public key to the identity storage.
   *
   * @param keyName The name of the public key to be added
   * @param publicKey Reference to the PublicKey object
   */
  virtual void
  addKey(const Name& keyName, const PublicKey& publicKey) = 0;

  /**
   * @brief Get shared pointer to PublicKey object from the identity storage
   *
   * @param keyName The name of the requested public key
   * @throws SecPublicInfo::Error if public key does not exist
   */
  virtual shared_ptr<PublicKey>
  getPublicKey(const Name& keyName) = 0;

  /**
   * @brief Get the type of the queried public key
   *
   * @note KeyType is also available from PublicKey instance.
   *       This method is more efficient if only KeyType is needed.
   *
   * @param keyName The name of the requested public key
   * @return the type of the key. If the queried key does not exist, KEY_TYPE_NULL will be returned
   */
  virtual KeyType
  getPublicKeyType(const Name& keyName) = 0;

  /**
   * @brief Check if the specified certificate already exists
   *
   * @param certificateName The name of the certificate
   */
  virtual bool
  doesCertificateExist(const Name& certificateName) = 0;

  /**
   * @brief Add a certificate to the identity storage.
   *
   * It will add the corresponding public key and identity if they do not exist
   *
   * @param certificate The certificate to be added
   */
  virtual void
  addCertificate(const IdentityCertificate& certificate) = 0;

  /**
   * @brief Get a shared pointer to identity certificate object from the identity storage
   *
   * @param certificateName The name of the requested certificate
   * @throws SecPublicInfo::Error if the certificate does not exist
   */
  virtual shared_ptr<IdentityCertificate>
  getCertificate(const Name& certificateName) = 0;


  /*****************************************
   *            Default Getter             *
   *****************************************/

  /**
   * @brief Get name of the default identity
   *
   * @throws SecPublicInfo::Error if there is no default.
   */
  virtual Name
  getDefaultIdentity() = 0;

  /**
   * @brief Get name of the default key name for the specified identity
   *
   * @param identityName The identity name
   * @throws SecPublicInfo::Error if there is no default
   */
  virtual Name
  getDefaultKeyNameForIdentity(const Name& identityName) = 0;

  /**
   * @brief Get name of the default certificate name for the specified key
   *
   * @param keyName The key name.
   * @throws SecPublicInfo::Error if there is no default.
   */
  virtual Name
  getDefaultCertificateNameForKey(const Name& keyName) = 0;

  /**
   * @brief Get all the identities from public info
   *
   * @param [out] nameList On return, the identity list
   * @param isDefault      If specified, only the default identity is returned
   */
  virtual void
  getAllIdentities(std::vector<Name>& nameList, bool isDefault) = 0;

  /**
   * @brief Get all the key names from public info
   *
   * @param [out] nameList On return, the key name list.
   * @param isDefault      If specified, only the default keys are returned
   */
  virtual void
  getAllKeyNames(std::vector<Name>& nameList, bool isDefault) = 0;

  /**
   * @brief Get all the key names of a particular identity
   *
   * @param identity       The specified identity name
   * @param [out] nameList On return, the key name list
   * @param isDefault      If specified, only the default key is returned
   */
  virtual void
  getAllKeyNamesOfIdentity(const Name& identity, std::vector<Name>& nameList, bool isDefault) = 0;

  /**
   * @brief Get all the certificate name in public info
   *
   * @param [out] nameList On return, the certificate name list
   * @param isDefault      If specified, only the default certificates are returned
   */
  virtual void
  getAllCertificateNames(std::vector<Name>& nameList, bool isDefault) = 0;

  /**
   * @brief Get all the certificate name of a particular key name
   *
   * @param keyName        The specified key name
   * @param [out] nameList On return, the certificate name list
   * @param isDefault      If specified, only the default certificate is returned
   */
  virtual void
  getAllCertificateNamesOfKey(const Name& keyName, std::vector<Name>& nameList, bool isDefault) = 0;

  /*****************************************
   *            Delete Methods             *
   *****************************************/

  /**
   * @brief Delete a certificate
   *
   * @param certificateName The certificate name
   */
  virtual void
  deleteCertificateInfo(const Name& certificateName) = 0;

  /**
   * @brief Delete a public key and related certificates
   *
   * @param keyName The key name
   */
  virtual void
  deletePublicKeyInfo(const Name& keyName) = 0;

  /**
   * @brief Delete an identity and related public keys and certificates
   *
   * @param identity The identity name
   */
  virtual void
  deleteIdentityInfo(const Name& identity) = 0;

protected:

  /*****************************************
   *            Default Setter             *
   *****************************************/

  /**
   * @brief Set the default identity
   *
   * @param identityName The default identity name
   */
  virtual void
  setDefaultIdentityInternal(const Name& identityName) = 0;

  /**
   * @brief Set the default key name for the corresponding identity
   *
   * @param keyName The key name
   * @throws SecPublicInfo::Error if the key does not exist
   */
  virtual void
  setDefaultKeyNameForIdentityInternal(const Name& keyName) = 0;

  /**
   * @brief Set the default certificate name for the corresponding key
   *
   * @param certificateName The certificate name
   * @throws SecPublicInfo::Error if the certificate does not exist
   */
  virtual void
  setDefaultCertificateNameForKeyInternal(const Name& certificateName) = 0;

public:

  /*****************************************
   *            Helper Methods             *
   *****************************************/

  /**
   * @brief Set the default identity
   *
   * @param identityName The default identity name
   * @throws SecPublicInfo::Error if the identity does not exist
   */
  void
  setDefaultIdentity(const Name& identityName);

  /**
   * @brief Set the default key name for the corresponding identity
   *
   * @param keyName The key name
   * @throws SecPublicInfo::Error if either the identity or key does not exist
   */
  void
  setDefaultKeyNameForIdentity(const Name& keyName);

  /**
   * @brief Set the default certificate name for the corresponding key
   *
   * @param certificateName The certificate name
   * @throws SecPublicInfo::Error if either the certificate or key does not exist
   */
  void
  setDefaultCertificateNameForKey(const Name& certificateName);

  /**
   * @brief Generate a key name for the identity
   *
   * @param identityName The identity name
   * @param useKsk If true, generate a KSK name, otherwise a DSK name
   * @return The generated key name
   */
  Name
  getNewKeyName(const Name& identityName, bool useKsk);

  /**
   * @brief Get the default certificate name for the specified identity
   *
   * @param identityName The identity name
   * @return The default certificate name
   * @throws SecPublicInfo::Error if no certificate is found
   */
  Name
  getDefaultCertificateNameForIdentity(const Name& identityName);

  /**
   * @brief Get the default certificate name of the default identity
   *
   * @return The requested certificate name
   * @throws SecPublicInfo::Error if no certificate is found
   */
  Name
  getDefaultCertificateName();

  /**
   * @brief Add a certificate and set the certificate as the default one of its corresponding key
   *
   * @param certificate The certificate to be added
   * @throws SecPublicInfo::Error if the certificate cannot be added (though it is really rare)
   */
  void
  addCertificateAsKeyDefault(const IdentityCertificate& certificate);

  /**
   * @brief Add a certificate into the public key identity storage and set the certificate as the
   *        default one of its corresponding identity
   *
   * @param certificate The certificate to be added
   * @throws SecPublicInfo::Error if the certificate cannot be added (though it is really rare)
   */
  void
  addCertificateAsIdentityDefault(const IdentityCertificate& certificate);

  /**
   * @brief Add a certificate into the public key identity storage and set the certificate as the
   *        default one of the default identity
   *
   * @param certificate The certificate to be added
   * @throws SecPublicInfo::Error if the certificate cannot be added (though it is really rare)
   */
  void
  addCertificateAsSystemDefault(const IdentityCertificate& certificate);

  /**
   * @brief Get cached default certificate of the default identity
   *
   * @return The certificate which might be empty shared_ptr<IdentityCertificate>()
   * @deprecated Use getDefaultCertificate instead
   */
  DEPRECATED(
  shared_ptr<IdentityCertificate>
  defaultCertificate());

  /**
   * @brief Get cached default certificate of the default identity
   *
   * @return The certificate which might be empty shared_ptr<IdentityCertificate>()
   */
  shared_ptr<IdentityCertificate>
  getDefaultCertificate();

  /**
   * @brief try to get the default certificate of the default identity from the public info
   */
  void
  refreshDefaultCertificate();

protected:
  shared_ptr<IdentityCertificate> m_defaultCertificate;
};

inline void
SecPublicInfo::setDefaultIdentity(const Name& identityName)
{
  setDefaultIdentityInternal(identityName);
  refreshDefaultCertificate();
}

inline void
SecPublicInfo::setDefaultKeyNameForIdentity(const Name& keyName)
{
  setDefaultKeyNameForIdentityInternal(keyName);
  refreshDefaultCertificate();
}

inline void
SecPublicInfo::setDefaultCertificateNameForKey(const Name& certificateName)
{
  setDefaultCertificateNameForKeyInternal(certificateName);
  refreshDefaultCertificate();
}

inline Name
SecPublicInfo::getDefaultCertificateNameForIdentity(const Name& identityName)
{
  return getDefaultCertificateNameForKey(getDefaultKeyNameForIdentity(identityName));
}

inline Name
SecPublicInfo::getNewKeyName (const Name& identityName, bool useKsk)
{
  std::ostringstream oss;

  if (useKsk)
    oss << "ksk-";
  else
    oss << "dsk-";

  oss << time::toUnixTimestamp(time::system_clock::now()).count();

  Name keyName = Name(identityName).append(oss.str());

  if (doesPublicKeyExist(keyName))
    throw Error("Key name already exists: " + keyName.toUri());

  return keyName;
}

inline Name
SecPublicInfo::getDefaultCertificateName()
{
  if (!static_cast<bool>(m_defaultCertificate))
    refreshDefaultCertificate();

  if (!static_cast<bool>(m_defaultCertificate))
    throw Error("No default certificate is set");

  return m_defaultCertificate->getName();
}

inline void
SecPublicInfo::addCertificateAsKeyDefault(const IdentityCertificate& certificate)
{
  addCertificate(certificate);
  setDefaultCertificateNameForKeyInternal(certificate.getName());
  refreshDefaultCertificate();
}

inline void
SecPublicInfo::addCertificateAsIdentityDefault(const IdentityCertificate& certificate)
{
  addCertificate(certificate);
  Name certName = certificate.getName();
  Name keyName = IdentityCertificate::certificateNameToPublicKeyName(certName);
  setDefaultKeyNameForIdentityInternal(keyName);
  setDefaultCertificateNameForKeyInternal(certName);
  refreshDefaultCertificate();
}

inline void
SecPublicInfo::addCertificateAsSystemDefault(const IdentityCertificate& certificate)
{
  addCertificate(certificate);
  Name certName = certificate.getName();
  Name keyName = IdentityCertificate::certificateNameToPublicKeyName(certName);
  setDefaultIdentityInternal(keyName.getPrefix(-1));
  setDefaultKeyNameForIdentityInternal(keyName);
  setDefaultCertificateNameForKeyInternal(certName);
  refreshDefaultCertificate();
}

inline shared_ptr<IdentityCertificate>
SecPublicInfo::defaultCertificate()
{
  return getDefaultCertificate();
}

inline shared_ptr<IdentityCertificate>
SecPublicInfo::getDefaultCertificate()
{
  return m_defaultCertificate;
}

inline void
SecPublicInfo::refreshDefaultCertificate()
{
  try
    {
      Name certName = getDefaultCertificateNameForIdentity(getDefaultIdentity());
      m_defaultCertificate = getCertificate(certName);
    }
  catch (SecPublicInfo::Error& e)
    {
      m_defaultCertificate.reset();
    }

}

} // namespace ndn

#endif //NDN_SECURITY_SEC_PUBLIC_INFO_HPP