/*
 * Copyright (C) 2007-2012 Xagasoft, All rights reserved.
 *
 * This file is part of the libgats library and is released under the
 * terms of the license contained in the file LICENSE.
 */

#ifndef GATS_OBJECT_H
#define GATS_OBJECT_H

#include <bu/string.h>

namespace Bu
{
    class Stream;
    class Formatter;
};

namespace Gats
{
    enum Type
    {
        typeDictionary,
        typeList,
        typeString,
        typeInteger,
        typeFloat,
        typeBoolean,
        typeNull
    };

    /**
     * The baseclass for every type that can be stored in a packet.
     */
    class Object
    {
    public:
        Object();
        virtual ~Object();

        virtual Type getType() const =0;

        virtual void write( Bu::Stream &rOut ) const=0;
        virtual void read( Bu::Stream &rIn, char cType )=0;
        virtual Object *clone() const=0;

        static Object *read( Bu::Stream &rIn );
        static Object *strToGats( const Bu::String &sStr );

    private:
        class StrPos
        {
        public:
            StrPos( const Bu::String::const_iterator &i ) :
                i( i ), iLine( 1 ), iChar( 1 )
            { }
            Bu::String::const_iterator i;
            int iLine;
            int iChar;

            char operator*()
            {
                return *i;
            }
            StrPos &operator++(int)
            {
                i++;
                if( i )
                {
                    if( *i == '\n' )
                    {
                        iLine++;
                        iChar = 0;
                    }
                    else
                        iChar++;
                }
                return *this;
            }
            operator bool()
            {
                return i;
            }
        };

        class Thrower : public Bu::String::FormatProxyEndAction
        {
        public:
            Thrower( Gats::Object::StrPos &i ) :
                i( i )
            {
            }

            virtual ~Thrower()
            {
            }

            virtual void operator()( const Bu::String &sFinal )
            {
                throw Bu::ExceptionBase(
                    (Bu::String("%1: %2: ").arg(i.iLine).arg(i.iChar).end() + sFinal)
                    .getStr()
                    );
            }

        private:
            Gats::Object::StrPos &i;
        };

        static Bu::String::FormatProxy posError( Gats::Object::StrPos &i, const Bu::String &msg );
        static Object *strToGats( Gats::Object::StrPos &i );
        static Bu::String token( Gats::Object::StrPos &i );
        static void skipWs( Gats::Object::StrPos &i );
    };

    const char *typeToStr( Type t );
};

Bu::Formatter &operator<<( Bu::Formatter &f, const Gats::Object &obj );
Bu::Formatter &operator<<( Bu::Formatter &f, const Gats::Type &t );

#endif