/* XMRig
 * Copyright (c) 2018-2021 SChernykh   <https://github.com/SChernykh>
 * Copyright (c) 2016-2021 XMRig       <https://github.com/xmrig>, <support@xmrig.com>
 *
 *   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 "base/io/log/FileLogWriter.h"
#include "base/io/Env.h"


#include <cassert>
#include <uv.h>


namespace xmrig {


static void fsWriteCallback(uv_fs_t *req)
{
    delete [] static_cast<char *>(req->data);

    uv_fs_req_cleanup(req);
    delete req;
}


} // namespace xmrig


bool xmrig::FileLogWriter::open(const char *fileName)
{
    assert(fileName != nullptr);
    if (!fileName) {
        return false;
    }

    uv_fs_t req{};
    const auto path = Env::expand(fileName);
    m_file          = uv_fs_open(uv_default_loop(), &req, path, O_CREAT | O_WRONLY, 0644, nullptr);

    if (req.result < 0 || !isOpen()) {
        uv_fs_req_cleanup(&req);
        m_file = -1;

        return false;
    }

    uv_fs_req_cleanup(&req);

    uv_fs_stat(uv_default_loop(), &req, path, nullptr);
    m_pos = req.statbuf.st_size;
    uv_fs_req_cleanup(&req);

    return true;
}


bool xmrig::FileLogWriter::write(const char *data, size_t size)
{
    if (!isOpen()) {
        return false;
    }

    uv_buf_t buf = uv_buf_init(new char[size], size);
    memcpy(buf.base, data, size);

    auto req = new uv_fs_t;
    req->data = buf.base;

    uv_fs_write(uv_default_loop(), req, m_file, &buf, 1, m_pos, fsWriteCallback);
    m_pos += size;

    return true;
}


bool xmrig::FileLogWriter::writeLine(const char *data, size_t size)
{
    const uv_buf_t buf[2] = {
        uv_buf_init(new char[size], size),
        uv_buf_init((char*)m_endl, sizeof(m_endl) - 1)
    };

    memcpy(buf[0].base, data, size);

    auto req = new uv_fs_t;
    req->data = buf[0].base;

    uv_fs_write(uv_default_loop(), req, m_file, buf, 2, m_pos, fsWriteCallback);
    m_pos += (buf[0].len + buf[1].len);

    return true;
}