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/*
  configuration.h - wraps gpgme configuration components
  Copyright (C) 2010 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_CONFIGURATION_H__
#define __GPGMEPP_CONFIGURATION_H__

#include <gpgme++/global.h>

#include <gpgme++/gpgmefw.h>

#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
#include <boost/type_traits/remove_pointer.hpp>
#if 0
#include <boost/variant.hpp>
#include <boost/optional.hpp>
#endif

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

namespace GpgME {
namespace Configuration {

    typedef boost::shared_ptr< boost::remove_pointer<gpgme_conf_comp_t>::type > shared_gpgme_conf_comp_t;
    typedef boost::weak_ptr< boost::remove_pointer<gpgme_conf_comp_t>::type > weak_gpgme_conf_comp_t;

    class Argument;
    class Option;
    class Component;

    enum Level {
        Basic,
        Advanced,
        Expert,
        Invisible,
        Internal,

        NumLevels
    };

    enum Type {
        NoType,
        StringType,
        IntegerType,
        UnsignedIntegerType,

        FilenameType = 32,
        LdapServerType,
        KeyFingerprintType,
        PublicKeyType,
        SecretKeyType,
        AliasListType,

        MaxType
    };

    enum Flag {
        Group    = (1 << 0),
        Optional = (1 << 1),
        List     = (1 << 2),
        Runtime  = (1 << 3),
        Default  = (1 << 4),
        DefaultDescription = (1 << 5),
        NoArgumentDescription = (1 << 6),
        NoChange = (1 << 7),

        LastFlag = NoChange
    };

    //
    // class Component
    //

    class GPGMEPP_EXPORT Component {
    public:
        Component() : comp() {}
        explicit Component( const shared_gpgme_conf_comp_t & comp )
            : comp( comp ) {}

        // copy ctor is ok

        const Component & operator=( const Component & other ) {
            if ( this != &other )
                Component( other ).swap( *this );
            return *this;
        }

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

        bool isNull() const { return !comp; }

        static std::vector<Component> load( Error & err );
        Error save() const;

        const char * name() const;
        const char * description() const;
        const char * programName() const;

        Option option( unsigned int index ) const;
        Option option( const char * name ) const;

        unsigned int numOptions() const;

        std::vector<Option> options() const;

        GPGMEPP_MAKE_SAFE_BOOL_OPERATOR( !isNull() )
    private:
        shared_gpgme_conf_comp_t comp;
    };

    //
    // class Option
    //

    class GPGMEPP_EXPORT Option {
    public:
        Option() : comp(), opt( 0 ) {}
        Option( const shared_gpgme_conf_comp_t & comp, gpgme_conf_opt_t opt )
            : comp( comp ), opt( opt ) {}

        const Option & operator=( const Option & other ) {
            if ( this != &other )
                Option( other ).swap( *this );
            return *this;
        }

        void swap( Option & other ) {
            using std::swap;
            swap( this->comp, other.comp );
            swap( this->opt,  other.opt );
        }

        bool isNull() const { return comp.expired() || !opt; }

        Component parent() const;

        unsigned int flags() const;

        Level level() const;

        const char * name() const;
        const char * description() const;
        const char * argumentName() const;

        Type type() const;
        Type alternateType() const;

        Argument defaultValue() const;
        const char * defaultDescription() const;

        Argument noArgumentValue() const;
        const char * noArgumentDescription() const;

        /*! The value that is in the config file (or null, if it's not set). */
        Argument activeValue() const;
        /*! The value that is in this object, ie. either activeValue(), newValue(), or defaultValue() */
        Argument currentValue() const;

        Argument newValue() const;
        bool set() const;
        bool dirty() const;

        Error setNewValue( const Argument & argument );
        Error resetToDefaultValue();
        Error resetToActiveValue();

        Argument createNoneArgument( bool set ) const;
        Argument createStringArgument( const char * value ) const;
        Argument createStringArgument( const std::string & value ) const;
        Argument createIntArgument( int value ) const;
        Argument createUIntArgument( unsigned int value ) const;

        Argument createNoneListArgument( unsigned int count ) const;
        Argument createStringListArgument( const std::vector<const char *> & value ) const;
        Argument createStringListArgument( const std::vector<std::string> & value ) const;
        Argument createIntListArgument( const std::vector<int> & values ) const;
        Argument createUIntListArgument( const std::vector<unsigned int> & values ) const;

        GPGMEPP_MAKE_SAFE_BOOL_OPERATOR( !isNull() )
    private:
        weak_gpgme_conf_comp_t  comp;
        gpgme_conf_opt_t opt;
    };

    //
    // class Argument
    //

    class GPGMEPP_EXPORT Argument {
        friend class ::GpgME::Configuration::Option;
        Argument( const shared_gpgme_conf_comp_t & comp, gpgme_conf_opt_t opt, gpgme_conf_arg_t arg, bool owns );
    public:
        Argument() : comp(), opt( 0 ), arg( 0 ) {}
        //Argument( const shared_gpgme_conf_comp_t & comp, gpgme_conf_opt_t opt, gpgme_conf_arg_t arg );
        Argument( const Argument & other );
        ~Argument();

        const Argument & operator=( const Argument & other ) {
            if ( this != &other )
                Argument( other ).swap( *this );
            return *this;
        }

        void swap( Argument & other ) {
            using std::swap;
            swap( this->comp, other.comp );
            swap( this->opt,  other.opt );
            swap( this->arg,  other.arg );
        }

        bool isNull() const { return comp.expired() || !opt || !arg; }

        Option parent() const;

        unsigned int numElements() const;

        bool boolValue() const;
        const char * stringValue( unsigned int index=0 ) const;
        int          intValue( unsigned int index=0 ) const;
        unsigned int uintValue( unsigned int index=0 ) const;

        unsigned int numberOfTimesSet() const;
        std::vector<const char *> stringValues() const;
        std::vector<int>          intValues() const;
        std::vector<unsigned int> uintValues() const;

        GPGMEPP_MAKE_SAFE_BOOL_OPERATOR( !isNull() )
    private:
        weak_gpgme_conf_comp_t comp;
        gpgme_conf_opt_t opt;
        gpgme_conf_arg_t arg;
    };

    GPGMEPP_EXPORT std::ostream & operator<<( std::ostream & os, Level level );
    GPGMEPP_EXPORT std::ostream & operator<<( std::ostream & os, Type type );
    GPGMEPP_EXPORT std::ostream & operator<<( std::ostream & os, Flag flag );
    GPGMEPP_EXPORT std::ostream & operator<<( std::ostream & os, const Component & component );
    GPGMEPP_EXPORT std::ostream & operator<<( std::ostream & os, const Option & option );
    GPGMEPP_EXPORT std::ostream & operator<<( std::ostream & os, const Argument & argument );

} // namespace Configuration
} // namespace GpgME

GPGMEPP_MAKE_STD_SWAP_SPECIALIZATION( Configuration::Component )
GPGMEPP_MAKE_STD_SWAP_SPECIALIZATION( Configuration::Option )
GPGMEPP_MAKE_STD_SWAP_SPECIALIZATION( Configuration::Argument )

#endif // __GPGMEPP_CONFIGURATION_H__