// * This file is part of the COLOBOT source code
// * Copyright (C) 2014 Polish Portal of Colobot (PPC)
// *
// * This program is free software: you can redistribute it and/or modify
// * it under the terms of the GNU General Public License as published by
// * the Free Software Foundation, either version 3 of the License, or
// * (at your option) any later version.
// *
// * This program 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 General Public License for more details.
// *
// * You should have received a copy of the GNU General Public License
// * along with this program. If not, see  http://www.gnu.org/licenses/.

#include "common/resources/outputstreambuffer.h"

#include <stdexcept>
#include <sstream>

COutputStreamBuffer::COutputStreamBuffer(size_t buffer_size) : m_buffer_size(buffer_size)
{
    m_file = nullptr;
    m_buffer = new char[buffer_size];
    setp(m_buffer, m_buffer + buffer_size);
}


COutputStreamBuffer::~COutputStreamBuffer()
{
    close();
    delete m_buffer;
}


void COutputStreamBuffer::open(const std::string &filename)
{
    if (PHYSFS_isInit())
        m_file = PHYSFS_openWrite(filename.c_str());
}


void COutputStreamBuffer::close()
{
    sync();
    if (is_open())
        PHYSFS_close(m_file);
}


bool COutputStreamBuffer::is_open()
{
    return m_file;
}


std::streambuf::int_type COutputStreamBuffer::overflow(std::streambuf::int_type ch)
{
    /* This function should be called when pptr() == epptr(). We use it also in sync()
       so we also have to write data if buffer is not full. */

    if (pbase() == pptr()) // no data to write, sync() called with empty buffer
        return 0;

    // save buffer
    PHYSFS_sint64 bytes_written = PHYSFS_write(m_file, pbase(), 1, pptr() - pbase());
    if (bytes_written <= 0)
        return traits_type::eof();

    pbump(-bytes_written);
    // write final char
    if (ch != traits_type::eof()) {
        bytes_written = PHYSFS_write(m_file, &ch, 1, 1);
        if (bytes_written <= 0)
            return traits_type::eof();
    }

    return ch;
}


int COutputStreamBuffer::sync()
{
    return overflow(traits_type::eof());
}