/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
 * Copyright (C) 2013 Regents of the University of California.
 * @author: Jeff Thompson <jefft0@remap.ucla.edu>
 * See COPYING for copyright and distribution information.
 */

#ifndef NDN_SEC_PUBLIC_INFO_MEMORY_HPP
#define NDN_SEC_PUBLIC_INFO_MEMORY_HPP

#include <vector>
#include <map>
#include "sec-public-info.hpp"

namespace ndn {

/**
 * MemoryKeyMetaInfo extends IdentityStorage and implements its methods to store identity, public key and certificate objects in memory.
 * The application must get the objects through its own means and add the objects to the MemoryKeyMetaInfo object.
 * To use permanent file-based storage, see BasicKeyMetaInfo.
 */
class SecPublicInfoMemory : public SecPublicInfo {
public:
  struct Error : public SecPublicInfo::Error { Error(const std::string &what) : SecPublicInfo::Error(what) {} };

  /**
   * The virtual Destructor.
   */
  virtual 
  ~SecPublicInfoMemory();

  /**
   * 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);

  /**
   * Add a new identity. An exception will be thrown if the identity already exists.
   * @param identityName The identity name to be added.
   */
  virtual void
  addIdentity(const Name& identityName);

  /**
   * Revoke the identity.
   * @return true if the identity was revoked, false if not.
   */
  virtual bool 
  revokeIdentity();

  /**
   * 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);

  /**
   * Add a public key to the identity storage.
   * @param keyName The name of the public key to be added.
   * @param keyType Type of the public key to be added.
   * @param publicKeyDer A blob of the public key DER to be added.
   */
  virtual void 
  addPublicKey(const Name& keyName, KeyType keyType, const PublicKey& publicKeyDer);

  /**
   * Get the public key DER blob from the identity storage.
   * @param keyName The name of the requested public key.
   * @return The DER Blob.  If not found, return a Blob with a null pointer.
   */
  virtual ptr_lib::shared_ptr<PublicKey>
  getPublicKey(const Name& keyName);

  /**
   * Activate a key.  If a key is marked as inactive, its private part will not be used in packet signing.
   * @param keyName name of the key
   */
  virtual void 
  activatePublicKey(const Name& keyName);

  /**
   * Deactivate a key. If a key is marked as inactive, its private part will not be used in packet signing.
   * @param keyName name of the key
   */
  virtual void 
  deactivatePublicKey(const Name& keyName);

  /**
   * Check if the specified certificate already exists.
   * @param certificateName The name of the certificate.
   * @return true if the certificate exists, otherwise false.
   */
  virtual bool
  doesCertificateExist(const Name& certificateName);

  /**
   * Add a certificate to the identity storage.
   * @param certificate The certificate to be added.  This makes a copy of the certificate.
   */
  virtual void 
  addCertificate(const IdentityCertificate& certificate);

  /**
   * Get a certificate from the identity storage.
   * @param certificateName The name of the requested certificate.
   * @param allowAny If false, only a valid certificate will be returned, otherwise validity is disregarded.
   * @return The requested certificate.  If not found, return a shared_ptr with a null pointer.
   */
  virtual ptr_lib::shared_ptr<IdentityCertificate> 
  getCertificate(const Name &certificateName, bool allowAny = false);


  /*****************************************
   *           Get/Set Default             *
   *****************************************/

  /**
   * Get the default identity. 
   * @param return The name of default identity, or an empty name if there is no default.
   */
  virtual Name 
  getDefaultIdentity();

  /**
   * Get the default key name for the specified identity.
   * @param identityName The identity name.
   * @return The default key name.
   */
  virtual Name 
  getDefaultKeyNameForIdentity(const Name& identityName);

  /**
   * Get the default certificate name for the specified key.
   * @param keyName The key name.
   * @return The default certificate name.
   */
  virtual Name 
  getDefaultCertificateNameForKey(const Name& keyName);

  virtual std::vector<Name>
  getAllIdentities(bool isDefault);

  virtual std::vector<Name>
  getAllKeyNames(bool isDefault);

  virtual std::vector<Name>
  getAllKeyNamesOfIdentity(const Name& identity, bool isDefault);
    
  virtual std::vector<Name>
  getAllCertificateNames(bool isDefault);

  virtual std::vector<Name>
  getAllCertificateNamesOfKey(const Name& keyName, bool isDefault);

protected:
  /**
   * Set the default identity.  If the identityName does not exist, then clear the default identity
   * so that getDefaultIdentity() returns an empty name.
   * @param identityName The default identity name.
   */
  virtual void 
  setDefaultIdentityInternal(const Name& identityName);

  /**
   * Set the default key name for the specified identity.
   * @param keyName The key name.
   * @param identityNameCheck (optional) The identity name to check the keyName.
   */
  virtual void 
  setDefaultKeyNameForIdentityInternal(const Name& keyName);

  /**
   * Set the default key name for the specified identity.
   * @param keyName The key name.
   * @param certificateName The certificate name.
   */
  virtual void 
  setDefaultCertificateNameForKeyInternal(const Name& certificateName);  

  
private:
  class KeyRecord {
  public:
    KeyRecord(KeyType keyType, const PublicKey &key)
    : keyType_(keyType), key_(key)
    {
    }
    
    const KeyType getKeyType() const { return keyType_; }
    
    const PublicKey& getKey() { return key_; }
    
  private:
    KeyType   keyType_;
    PublicKey key_;
  };
  
  std::vector<std::string> identityStore_; /**< A list of name URI. */
  std::string defaultIdentity_;            /**< The default identity in identityStore_, or "" if not defined. */
  Name defaultKeyName_;
  Name defaultCert_;

  typedef std::map< std::string, ptr_lib::shared_ptr<KeyRecord> > KeyStore; /**< The map key is the keyName.toUri() */
  typedef std::map< std::string, ptr_lib::shared_ptr<IdentityCertificate> > CertificateStore; /**< The map key is the certificateName.toUri() */
  
  KeyStore keyStore_; 
  CertificateStore certificateStore_;                    
};

}

#endif