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/*
 * Copyright (C) 2007-2012 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_CACHE_STORE_FILES_H
#define BU_CACHE_STORE_FILES_H

#include "bu/string.h"
#include "bu/file.h"
#include "bu/cachestore.h"
#include "bu/archive.h"
#include "bu/membuf.h"
#include "bu/formatter.h"
#include "bu/sio.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>

namespace Bu
{
    template<class keytype, class obtype>
    keytype __cacheGetKey( const obtype *pObj );

    template<class keytype, class obtype>
    obtype *__cacheStoreFilesAlloc( const keytype &key )
    {
        return new obtype();
    }

    template<class keytype, class obtype>
    void __cacheStoreFilesStore( Bu::Stream &s, obtype &rObj,
            const keytype & )
    {
        Bu::Archive ar( s, Bu::Archive::save );
        ar << rObj;
    }

    template<class keytype, class obtype>
    obtype *__cacheStoreFilesLoad( Bu::Stream &s, const keytype &key )
    {
        obtype *pObj = __cacheStoreFilesAlloc<keytype, obtype>( key );
        Bu::Archive ar( s, Bu::Archive::load );
        ar >> (*pObj);
        return pObj;
    }

    template<class keytype, class obtype>
    class CacheStoreFiles : public CacheStore<keytype, obtype>
    {
    public:
        CacheStoreFiles( const Bu::String &sPrefix ) :
            sPrefix( sPrefix )
        {
            if( access( sPrefix.getStr(), W_OK|R_OK|X_OK ) )
            {
#ifdef WIN32
                mkdir( sPrefix.getStr() );
#else
                mkdir( sPrefix.getStr(), 0755 );
#endif
            }
        }

        virtual ~CacheStoreFiles()
        {
        }
        
        virtual obtype *load( const keytype &key )
        {
//          try
//          {
                Bu::MemBuf mb;
                Bu::Formatter f( mb );
                f << sPrefix << "/" << key;
                Bu::File fIn( mb.getString(), Bu::File::Read );
                obtype *pOb = __cacheStoreFilesLoad<keytype, obtype>( fIn, key );
                return pOb;
//          }
//          catch( std::exception &e )
//          {
//              throw Bu::HashException( e.what() );
//          }
        }

        virtual void unload( obtype *pObj, const keytype & )
        {
            delete pObj;
        }

        virtual keytype create( obtype *pSrc )
        {
            keytype key = __cacheGetKey<keytype, obtype>( pSrc );
            Bu::MemBuf mb;
            Bu::Formatter f( mb );
            f << sPrefix << "/" << key;

            Bu::File fTouch( mb.getString(), Bu::File::WriteNew );

            return key;
        }

        virtual void sync()
        {
        }

        virtual void sync( obtype *pSrc, const keytype &key )
        {
            Bu::MemBuf mb;
            Bu::Formatter f( mb );
            f << sPrefix << "/" << key;

            Bu::File fOut( mb.getString(), Bu::File::WriteNew );
            __cacheStoreFilesStore<keytype, obtype>( fOut, *pSrc, key );
        }

        virtual void destroy( obtype *pObj, const keytype &key )
        {
            Bu::MemBuf mb;
            Bu::Formatter f( mb );
            f << sPrefix << "/" << key;

            unlink( mb.getString().getStr() );
            delete pObj;
        }

        virtual void destroy( const keytype &key )
        {
            Bu::MemBuf mb;
            Bu::Formatter f( mb );
            f << sPrefix << "/" << key;

            unlink( mb.getString().getStr() );
        }

        virtual bool has( const keytype &key )
        {
            Bu::MemBuf mb;
            Bu::Formatter f( mb );
            f << sPrefix << "/";
            Bu::String sBase = mb.getString();
            f << key;

            if( sBase == mb.getString() )
                return false;

            return access( mb.getString().getStr(), F_OK ) == 0;
        }

        virtual Bu::List<keytype> getKeys()
        {
            DIR *dir = opendir( sPrefix.getStr() );
            struct dirent *de;
            Bu::List<keytype> lKeys;

            while( (de = readdir( dir ) ) )
            {
                if( de->d_type != DT_REG )
                    continue;

                keytype tmp;
                Bu::MemBuf mb( de->d_name );
                Bu::Formatter f( mb );
                try
                {
                    Fmt fm;
                    fm.tokenize( false );
                    f << fm;
                    f >> tmp;
                }
                catch( Bu::ExceptionBase &e )
                {
                    Bu::sio << "Parse error in dir-scan: " << e.what()
                        << Bu::sio.nl;
                }
                lKeys.append( tmp );
            }
            closedir( dir );

            return lKeys;
        }

        virtual int getSize()
        {
            DIR *dir = opendir( sPrefix.getStr() );
            struct dirent *de;
            int iCount = 0;

            while( (de = readdir( dir ) ) )
            {
                if( de->d_type != DT_REG )
                    continue;

                iCount++;
            }
            closedir( dir );

            return iCount;
        }

    private:
        Bu::String sPrefix;
    };

};

#endif