/*
  key.h - wraps a gpgme key
  Copyright (C) 2003, 2005 Klarälvdalens Datakonsult AB

  This file is part of GPGME++.

  GPGME++ is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  GPGME++ 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 Library General Public License for more details.

  You should have received a copy of the GNU Library General Public License
  along with GPGME++; see the file COPYING.LIB.  If not, write to the
  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  Boston, MA 02110-1301, USA.
*/

// -*- c++ -*-
#ifndef __GPGMEPP_KEY_H__
#define __GPGMEPP_KEY_H__

#include <gpgme++/global.h>
#include <gpgme++/notation.h>

#include <gpgme++/gpgmefw.h>

#include <boost/shared_ptr.hpp>
#include <boost/type_traits/remove_pointer.hpp>

#include <sys/time.h>

#include <vector>
#include <algorithm>
#include <string>

namespace GpgME {

  class Context;

  class Subkey;
  class UserID;

  typedef boost::shared_ptr< boost::remove_pointer<gpgme_key_t>::type > shared_gpgme_key_t;

  //
  // class Key
  //

  class GPGMEPP_EXPORT Key {
    friend class ::GpgME::Context;
    struct Null {};
  public:
    Key();
    /* implicit */ Key( const Null & );
    Key( const shared_gpgme_key_t & key );
    Key( gpgme_key_t key, bool acquireRef );

    static Null null;

    const Key & operator=( Key other ) {
        swap( other );
        return *this;
    }

    const Key & mergeWith( const Key & other );

    void swap( Key & other ) {
        using std::swap;
        swap( this->key, other.key );
    }

    bool isNull() const { return !key; }

    UserID userID( unsigned int index ) const;
    Subkey subkey( unsigned int index ) const;

    unsigned int numUserIDs() const;
    unsigned int numSubkeys() const;

    std::vector<UserID> userIDs() const;
    std::vector<Subkey> subkeys() const;

    bool isRevoked() const;
    bool isExpired() const;
    bool isDisabled() const;
    bool isInvalid() const;

    bool canEncrypt() const;
    /*!
      This function contains a workaround for old gpgme's: all secret
      OpenPGP keys canSign() == true, which canReallySign() doesn't
      have. I don't have time to find what breaks when I remove this
      workaround, but since Kleopatra merges secret into public keys,
      the workaround is not necessary there (and actively harms), I've
      added a new function instead.
     */
    bool canSign() const;
    bool canReallySign() const;
    bool canCertify() const;
    bool canAuthenticate() const;
    bool isQualified() const;

    bool hasSecret() const;
    GPGMEPP_DEPRECATED bool isSecret() const { return hasSecret(); }

    /*!
      @return true if this is a X.509 root certificate (currently
      equivalent to something like
      strcmp( chainID(), subkey(0).fingerprint() ) == 0 )
    */
    bool isRoot() const;

    enum OwnerTrust { Unknown=0, Undefined=1, Never=2,
                    Marginal=3, Full=4, Ultimate=5 };

    OwnerTrust ownerTrust() const;
    char ownerTrustAsString() const;

    Protocol protocol() const;
    const char * protocolAsString() const;

    const char * issuerSerial() const;
    const char * issuerName() const;
    const char * chainID() const;

    const char * keyID() const;
    const char * shortKeyID() const;
    const char * primaryFingerprint() const;

    unsigned int keyListMode() const;

  private:
    gpgme_key_t impl() const { return key.get(); }
    shared_gpgme_key_t key;
  };

  //
  // class Subkey
  //

  class GPGMEPP_EXPORT Subkey {
  public:
    Subkey();
    Subkey( const shared_gpgme_key_t & key, gpgme_sub_key_t subkey );
    Subkey( const shared_gpgme_key_t & key, unsigned int idx );

    const Subkey & operator=( Subkey other ) {
        swap( other );
        return *this;
    }

    void swap( Subkey & other ) {
        using std::swap;
        swap( this->key, other.key );
        swap( this->subkey, other.subkey );
    }

    bool isNull() const { return !key || !subkey; }

    Key parent() const;

    const char * keyID() const;
    const char * fingerprint() const;

    time_t creationTime() const;
    time_t expirationTime() const;
    bool neverExpires() const;

    bool isRevoked() const;
    bool isExpired() const;
    bool isInvalid() const;
    bool isDisabled() const;

    bool canEncrypt() const;
    bool canSign() const;
    bool canCertify() const;
    bool canAuthenticate() const;
    bool isQualified() const;
    bool isCardKey() const;

    bool isSecret() const;

    unsigned int publicKeyAlgorithm() const;
    const char * publicKeyAlgorithmAsString() const;

    unsigned int length() const;

    const char * cardSerialNumber() const;

  private:
    shared_gpgme_key_t key;
    gpgme_sub_key_t subkey;
  };

  //
  // class UserID
  //

  class GPGMEPP_EXPORT UserID {
  public:
    class Signature;

    UserID();
    UserID( const shared_gpgme_key_t & key, gpgme_user_id_t uid );
    UserID( const shared_gpgme_key_t & key, unsigned int idx );

    const UserID & operator=( UserID other ) {
        swap( other );
        return *this;
    }

    void swap( UserID & other ) {
        using std::swap;
        swap( this->key, other.key );
        swap( this->uid, other.uid );
    }

    bool isNull() const { return !key || !uid; }

    Key parent() const;

    unsigned int numSignatures() const;
    Signature signature( unsigned int index ) const;
    std::vector<Signature> signatures() const;

    const char * id() const;
    const char * name() const;
    const char * email() const;
    const char * comment() const;

    enum Validity { Unknown=0, Undefined=1, Never=2,
                    Marginal=3, Full=4, Ultimate=5 };

    Validity validity() const;
    char validityAsString() const;

    bool isRevoked() const;
    bool isInvalid() const;

  private:
    shared_gpgme_key_t key;
    gpgme_user_id_t uid;
  };

  //
  // class UserID::Signature
  //

  class GPGMEPP_EXPORT UserID::Signature {
  public:
    typedef GPGMEPP_DEPRECATED GpgME::Notation Notation;

    Signature();
    Signature( const shared_gpgme_key_t & key, gpgme_user_id_t uid, gpgme_key_sig_t sig );
    Signature( const shared_gpgme_key_t & key, gpgme_user_id_t uid, unsigned int idx );

    const Signature & operator=( Signature other ) {
        swap( other );
        return *this;
    }

    void swap( Signature & other ) {
        using std::swap;
        swap( this->key, other.key );
        swap( this->uid, other.uid );
        swap( this->sig, other.sig );
    }

    bool isNull() const { return !sig || !uid || !key ; }

    UserID parent() const;

    const char * signerKeyID() const;

    const char * algorithmAsString() const;
    unsigned int algorithm() const;
    time_t creationTime() const;
    time_t expirationTime() const;
    bool neverExpires() const;

    bool isRevokation() const;
    bool isInvalid() const;
    bool isExpired() const;
    bool isExportable() const;

    const char * signerUserID() const;
    const char * signerName() const;
    const char * signerEmail() const;
    const char * signerComment() const;

    unsigned int certClass() const;

    enum Status { NoError = 0, SigExpired, KeyExpired,
                  BadSignature, NoPublicKey, GeneralError };
    Status status() const;
    std::string statusAsString() const;

    const char * policyURL() const;

    unsigned int numNotations() const;
    GpgME::Notation notation( unsigned int idx ) const;
    std::vector<GpgME::Notation> notations() const;

  private:
    shared_gpgme_key_t key;
    gpgme_user_id_t uid;
    gpgme_key_sig_t sig;
  };

} // namespace GpgME

GPGMEPP_MAKE_STD_SWAP_SPECIALIZATION( Key )
GPGMEPP_MAKE_STD_SWAP_SPECIALIZATION( Subkey )
GPGMEPP_MAKE_STD_SWAP_SPECIALIZATION( UserID )
GPGMEPP_MAKE_STD_SWAP_SPECIALIZATION( UserID::Signature )

#endif // __GPGMEPP_KEY_H__