/* Copyright (C) CJ Affiliate
 *
 * You may use, distribute and modify this code under  the
 * terms of the  GNU General Public License  version 2  or
 * later.
 *
 * You should have received a copy of the license with this
 * file. If not, you will find a copy in the "LICENSE" file
 * at https://github.com/cjdev/dual-control.
 */

#ifndef SYS_FSTREAM_H
#define SYS_FSTREAM_H

#include <memory>
#include <sstream>
#include <iostream>

class fstreams_ifc
{
public:
    typedef std::shared_ptr<std::istream> pstream;
    typedef std::shared_ptr<std::ostream> postream;
    virtual ~fstreams_ifc() {}
    virtual pstream open_fstream (const std::string &file_path) const
    {
        return pstream (new std::istringstream (""));
    }
    virtual postream open_ofstream (const std::string &file_path,
                                    std::ios_base::openmode mode) const
    {
        return postream (new std::ostringstream (""));
    }
};

class fstreams
{
public:
    typedef std::shared_ptr<fstreams_ifc> delegate;
private:
    delegate delegate_;
public:
    typedef fstreams_ifc::pstream pstream;
    typedef fstreams_ifc::postream postream;
    fstreams (const delegate &delegate) : delegate_ (delegate) {}
    fstreams() : fstreams (delegate (new fstreams_ifc)) {}
    pstream open_fstream (const std::string &file_path) const
    {
        return delegate_->open_fstream (file_path);
    }
    postream open_ofstream (const std::string &file_path,
                            std::ios_base::openmode mode) const
    {
        return delegate_->open_ofstream (file_path, mode);
    }
    static fstreams create();
};

#endif