/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <log4cxx/helpers/asyncbuffer.h>

#include <log4cxx/helpers/transcoder.h>

#if defined(__cpp_concepts) && 202002 <= __cpp_concepts

#include <variant>

#endif // defined(__cpp_concepts) && 202002 <= __cpp_concepts

namespace LOG4CXX_NS

{

namespace helpers

{

struct AsyncBuffer::Private

{

#if defined(__cpp_concepts) && 202002 <= __cpp_concepts && LOG4CXX_WCHAR_T_API

    using value_t = std::variant<MessageBufferAppender, WideMessageBufferAppender>;

#else // !(defined(__cpp_concepts) && 202002 <= __cpp_concepts && LOG4CXX_WCHAR_T_API)

    using value_t = MessageBufferAppender;

#endif // !(defined(__cpp_concepts) && 202002 <= __cpp_concepts && LOG4CXX_WCHAR_T_API)

  std::vector<value_t> data;

  Private(const value_t& f)

    : data{ f }

  {}

#if LOG4CXX_ASYNC_BUFFER_SUPPORTS_FMT

  StringViewType fmt_string;

  FmtArgStore    fmt_args;

  Private(StringViewType&& format_string, FmtArgStore&& args)

    : fmt_string{ std::move(format_string) }

    , fmt_args{ std::move(args) }

  {}

#if LOG4CXX_WCHAR_T_API || LOG4CXX_LOGCHAR_IS_WCHAR

  WideStringViewType fmt_wstring;

  WideFmtArgStore    fmt_wargs;

  Private(WideStringViewType&& format_string, WideFmtArgStore&& args)

    : fmt_wstring{ std::move(format_string) }

    , fmt_wargs{ std::move(args) }

  {}

#endif // LOG4CXX_WCHAR_T_API || LOG4CXX_LOGCHAR_IS_WCHAR

#endif // LOG4CXX_ASYNC_BUFFER_SUPPORTS_FMT

};

#if LOG4CXX_ASYNC_BUFFER_SUPPORTS_FMT

void AsyncBuffer::initializeForFmt(StringViewType&& format_string, FmtArgStore&& args)

{

  if (!m_priv)

    m_priv = std::make_unique<Private>(std::move(format_string), std::move(args));

  else

  {

    m_priv->fmt_string = std::move(format_string);

    m_priv->fmt_args = std::move(args);

  }

}

#if LOG4CXX_WCHAR_T_API || LOG4CXX_LOGCHAR_IS_WCHAR

void AsyncBuffer::initializeForFmt(WideStringViewType&& format_string, WideFmtArgStore&& args)

{

  if (!m_priv)

    m_priv = std::make_unique<Private>(std::move(format_string), std::move(args));

  else

  {

    m_priv->fmt_wstring = std::move(format_string);

    m_priv->fmt_wargs = std::move(args);

  }

}

#endif // LOG4CXX_WCHAR_T_API || LOG4CXX_LOGCHAR_IS_WCHAR

#endif // LOG4CXX_ASYNC_BUFFER_SUPPORTS_FMT

/** An empty buffer.

*/

AsyncBuffer::AsyncBuffer()

{}

/** A new buffer with the content of \c other

*/

AsyncBuffer::AsyncBuffer(AsyncBuffer&& other)

  : m_priv(std::move(other.m_priv))

{

}

/** Release resources.

*/

AsyncBuffer::~AsyncBuffer()

{

}

/**

* Has no item been added to this?

*/

bool AsyncBuffer::empty() const

{

  bool result{ true };

  if (m_priv)

  {

    result = m_priv->data.empty();

#if LOG4CXX_ASYNC_BUFFER_SUPPORTS_FMT

    if (result)

      result = (0 == m_priv->fmt_string.size());

#if LOG4CXX_WCHAR_T_API || LOG4CXX_LOGCHAR_IS_WCHAR

    if (result)

      result = (0 == m_priv->fmt_wstring.size());

#endif // LOG4CXX_WCHAR_T_API || LOG4CXX_LOGCHAR_IS_WCHAR

#endif

  }

  return result;

}

/**

* Add text version of buffered values to \c msg

*/

void AsyncBuffer::renderMessage(LogCharMessageBuffer& msg) const

{

  if (m_priv)

  {

    for (auto& renderer : m_priv->data)

#if defined(__cpp_concepts) && 202002 <= __cpp_concepts && LOG4CXX_WCHAR_T_API

    {

#if LOG4CXX_LOGCHAR_IS_UTF8

      if (auto pRenderer = std::get_if<MessageBufferAppender>(&renderer))

        (*pRenderer)(msg);

      else

      {

        WideMessageBuffer wideBuf;

        std::get<WideMessageBufferAppender>(renderer)(wideBuf);

        LOG4CXX_DECODE_WCHAR(lsMsg, wideBuf.extract_str(wideBuf));

        msg << lsMsg;

      }

#else // !LOG4CXX_LOGCHAR_IS_UTF8

      if (auto pRenderer = std::get_if<WideMessageBufferAppender>(&renderer))

        (*pRenderer)(msg);

      else

      {

        CharMessageBuffer narrowBuf;

        std::get<MessageBufferAppender>(renderer)(narrowBuf);

        LOG4CXX_DECODE_CHAR(lsMsg, narrowBuf.extract_str(narrowBuf));

        msg << lsMsg;

      }

#endif // !LOG4CXX_LOGCHAR_IS_UTF8

    }

#else // !(defined(__cpp_concepts) && 202002 <= __cpp_concepts && LOG4CXX_WCHAR_T_API)

      renderer(msg);

#endif // !(defined(__cpp_concepts) && 202002 <= __cpp_concepts && LOG4CXX_WCHAR_T_API)

#if LOG4CXX_ASYNC_BUFFER_SUPPORTS_FMT

#if LOG4CXX_LOGCHAR_IS_UTF8

    if (0 < m_priv->fmt_string.size())

      msg << fmt::vformat(m_priv->fmt_string, m_priv->fmt_args);

#if LOG4CXX_WCHAR_T_API

    if (0 < m_priv->fmt_wstring.size())

    {

      LOG4CXX_DECODE_WCHAR(lsMsg, fmt::vformat(m_priv->fmt_wstring, m_priv->fmt_wargs));

      msg << lsMsg;

    }

#endif // LOG4CXX_WCHAR_T_API

#endif // LOG4CXX_LOGCHAR_IS_UTF8

#if LOG4CXX_LOGCHAR_IS_WCHAR

    if (0 < m_priv->fmt_wstring.size())

      msg << fmt::vformat(m_priv->fmt_wstring, m_priv->fmt_wargs);

    if (0 < m_priv->fmt_string.size())

    {

      LOG4CXX_DECODE_CHAR(lsMsg, fmt::vformat(m_priv->fmt_string, m_priv->fmt_args));

      msg << lsMsg;

    }

#endif // LOG4CXX_LOGCHAR_IS_WCHAR

#endif // LOG4CXX_ASYNC_BUFFER_SUPPORTS_FMT

  }

}

/**

* Remove all message appenders

*/

void AsyncBuffer::clear()

{

  if (m_priv)

  {

    m_priv->data.clear();

#if LOG4CXX_ASYNC_BUFFER_SUPPORTS_FMT

    m_priv->fmt_string = {};

#if LOG4CXX_WCHAR_T_API || LOG4CXX_LOGCHAR_IS_WCHAR

    m_priv->fmt_wstring = {};

#endif // LOG4CXX_WCHAR_T_API || LOG4CXX_LOGCHAR_IS_WCHAR

#endif // LOG4CXX_ASYNC_BUFFER_SUPPORTS_FMT

  }

}

#if defined(__cpp_concepts) && 202002 <= __cpp_concepts

/**

 *   Append \c function to this buffer.

 */

void AsyncBuffer::append(const MessageBufferAppender& f)

{

  if (!m_priv)

    m_priv = std::make_unique<Private>(f);

  else

    m_priv->data.push_back(f);

}

#if LOG4CXX_WCHAR_T_API

/**

 *   Append \c function to this buffer.

 */

void AsyncBuffer::append(const WideMessageBufferAppender& f)

{

  if (!m_priv)

    m_priv = std::make_unique<Private>(f);

  else

    m_priv->data.push_back(f);

}

#endif // LOG4CXX_WCHAR_T_API

#else // !(defined(__cpp_concepts) && 202002 <= __cpp_concepts

/**

 *   Append \c function to this buffer.

 */

void AsyncBuffer::append(const MessageBufferAppender& f)

{

  if (!m_priv)

    m_priv = std::make_unique<Private>(f);

  else

    m_priv->data.push_back(f);

}

#endif // !(defined(__cpp_concepts) && 202002 <= __cpp_concepts

} // namespace helpers

} // namespace LOG4CXX_NS