/*
 * Copyright (C) 2007-2019 Xagasoft, All rights reserved.
 *
 * This file is part of the libbu++ library and is released under the
 * terms of the license contained in the file LICENSE.
 */

#ifndef BU_BLOB_BUILDER_H
#define BU_BLOB_BUILDER_H

#include "bu/config.h"
#include "bu/sharedcore.h"

namespace Bu
{
    class Blob;
    class BlobBuilder;

    /** @cond DEVEL */
    class BlobBuilderCore
    {
    friend class BlobBuilder;
    friend class SharedCore<BlobBuilder, BlobBuilderCore>;
    private:
        class Chunk
        {
        public:
            Chunk( const char *pSrc, int32_t iLength );
            ~Chunk();

            void append( const char *&pSrc, int32_t &iLength );

            /**
             * Splits this chunk into two chunks, and fixes the links.
             *@param iIndex The first byte to be in the new chunk, if this is
             * zero or less then it has no effect.
             *@returns A pointer to the new chunk, or null if no work was
             * done.
             */
            Chunk *split( int32_t iIndex );

            int32_t iLength;
            char *pData;
            Chunk *pNext;
        };

        BlobBuilderCore();
        BlobBuilderCore( const BlobBuilderCore &rSrc );
        virtual ~BlobBuilderCore();

        void clear();
        void append( const char *pSrc, int32_t iLength );
        void prepend( const char *pSrc, int32_t iLength );
        void insert( int32_t iBefore, const char *pSrc, int32_t iLength );
        void set( const char *pSrc, int32_t iLength );
        void copyTo( void *pDestRaw, int32_t iLength ) const; 

        Chunk *pFirst;
        Chunk *pLast;
        int32_t iLength;
    };
    /** @endcond */

    class BlobBuilder : public Bu::SharedCore<BlobBuilder, BlobBuilderCore>
    {
    protected:
        using SharedCore<BlobBuilder, BlobBuilderCore>::core;
        using SharedCore<BlobBuilder, BlobBuilderCore>::_hardCopy;

    public:
        BlobBuilder();
        BlobBuilder( const Blob &rSrc );
        BlobBuilder( const BlobBuilder &rSrc );
        virtual ~BlobBuilder();

        void set( const Blob &rSrc );
        void set( const char *pSrc, int32_t iLength );
        void set( const char *pSrc );
        void append( const Blob &rSrc );
        void append( const char *pSrc, int32_t iLength );
        void append( const char *pSrc );
        void prepend( const Blob &rSrc );
        void prepend( const char *pSrc, int32_t iLength );
        void prepend( const char *pSrc );
        void insert( int32_t iBefore, const Blob &rSrc );
        void insert( int32_t iBefore, const char *pSrc, int32_t iLength );
        void insert( int32_t iBefore, const char *pSrc );
        void clear();

        int32_t getSize() const;
        Blob getBlob() const;
        void copyTo( void *pDestRaw, int32_t iDestSize ) const;

        BlobBuilder &operator=( const Blob &rSrc );
        BlobBuilder &operator=( const char *pSrc );
        BlobBuilder &operator+=( const Blob &rSrc );
        BlobBuilder &operator+=( const char *pSrc );
    private:
    };
};

#endif