/*
 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
#ifndef SHARE_LOGGING_ASYNCLOG_HPP
#define SHARE_LOGGING_ASYNCLOG_HPP
#include "logging/logLevel.hpp"
#include "logging/logPrefix.hpp"
#include "logging/logTagSet.hpp"
#include "logging/logTag.hpp"
#include "logging/logAsyncFlusher.hpp"
#include "logging/logMessageBuffer.hpp"

#define asynclog_error(...)   (!asynclog_is_enabled(Error, __VA_ARGS__))   ? (void)0 : AsyncLogImpl<LOG_TAGS(__VA_ARGS__)>().write<LogLevel::Error>
#define asynclog_warning(...) (!asynclog_is_enabled(Warning, __VA_ARGS__)) ? (void)0 : AsyncLogImpl<LOG_TAGS(__VA_ARGS__)>().write<LogLevel::Warning>
#define asynclog_info(...)    (!asynclog_is_enabled(Info, __VA_ARGS__))    ? (void)0 : AsyncLogImpl<LOG_TAGS(__VA_ARGS__)>().write<LogLevel::Info>
#define asynclog_debug(...)   (!asynclog_is_enabled(Debug, __VA_ARGS__))   ? (void)0 : AsyncLogImpl<LOG_TAGS(__VA_ARGS__)>().write<LogLevel::Debug>
#define asynclog_trace(...)   (!asynclog_is_enabled(Trace, __VA_ARGS__))   ? (void)0 : AsyncLogImpl<LOG_TAGS(__VA_ARGS__)>().write<LogLevel::Trace>

// Macros for logging that should be excluded in product builds.
// Available for levels Info, Debug and Trace. Includes test macro that
// evaluates to false in product builds.
#ifndef PRODUCT
#define asynclog_develop_info(...)  (!asynclog_is_enabled(Info, __VA_ARGS__))   ? (void)0 : AsyncLogImpl<LOG_TAGS(__VA_ARGS__)>().write<LogLevel::Info>
#define asynclog_develop_debug(...) (!asynclog_is_enabled(Debug, __VA_ARGS__))  ? (void)0 : AsyncLogImpl<LOG_TAGS(__VA_ARGS__)>().write<LogLevel::Debug>
#define asynclog_develop_trace(...) (!asynclog_is_enabled(Trace, __VA_ARGS__))  ? (void)0 : AsyncLogImpl<LOG_TAGS(__VA_ARGS__)>().write<LogLevel::Trace>
#define asynclog_develop_is_enabled(level, ...)  asynclog_is_enabled(level, __VA_ARGS__)
#else
#define DUMMY_ARGUMENT_CONSUMER(...)
#define asynclog_develop_info(...)  DUMMY_ARGUMENT_CONSUMER
#define asynclog_develop_debug(...) DUMMY_ARGUMENT_CONSUMER
#define asynclog_develop_trace(...) DUMMY_ARGUMENT_CONSUMER
#define asynclog_develop_is_enabled(...)  false
#endif

// Convenience macro to test if the logging is enabled on the specified level for given tags.
#define asynclog_is_enabled(level, ...) (AsyncLogImpl<LOG_TAGS(__VA_ARGS__)>::is_level(LogLevel::level))

#define AsyncLog(...)  AsyncLogImpl<LOG_TAGS(__VA_ARGS__)>
#define AsyncLogTarget(level, ...) AsyncLogTargetImpl<LogLevel::level, LOG_TAGS(__VA_ARGS__)>

template <LogLevelType level, LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag>
class AsyncLogTargetImpl;

class Arena;

template <LogTagType T0, LogTagType T1 = LogTag::__NO_TAG, LogTagType T2 = LogTag::__NO_TAG, LogTagType T3 = LogTag::__NO_TAG,
          LogTagType T4 = LogTag::__NO_TAG, LogTagType GuardTag = LogTag::__NO_TAG>
class AsyncLogImpl {
 private:
  Arena* _arena;
  LogMessageBuffer* _buf;
  void create_async_buffer() {
      Arena* arena = new (mtLogging)Arena(mtLogging, LogMessageBuffer::initial_buffer_size());
      _buf = new (mtLogging)LogMessageBuffer(arena);
      _buf->set_prefix(LogPrefix<T0, T1, T2, T3, T4>::prefix);
  }

 public:
  // Make sure no more than the maximum number of tags have been given.
  // The GuardTag allows this to be detected if/when it happens. If the GuardTag
  // is not __NO_TAG, the number of tags given exceeds the maximum allowed.
  STATIC_ASSERT(GuardTag == LogTag::__NO_TAG); // Number of logging tags exceeds maximum supported!

  AsyncLogImpl() : _arena(NULL), _buf(NULL) {
  }

  ~AsyncLogImpl() {
      if (_buf != NULL) {
        LogAsyncFlusher* flusher = LogAsyncFlusher::instance();
        flusher->enqueue(&LogTagSetMapping<T0, T1, T2, T3, T4>::tagset(), _buf);
      }
  }

  static bool is_level(LogLevelType level) {
    return LogTagSetMapping<T0, T1, T2, T3, T4>::tagset().is_level(level);
  }

  ATTRIBUTE_PRINTF(3, 4)
  void write(LogLevelType level, const char* fmt, ...) {
    va_list args;
    va_start(args, fmt);
    vwrite(level, fmt, args);
    va_end(args);
  }

  // to be implemented or deleted.
  void write(const LogMessageBuffer& msg);

  template <LogLevelType Level>
  ATTRIBUTE_PRINTF(2, 3)
  void write(const char* fmt, ...) {
    va_list args;
    va_start(args, fmt);
    vwrite(Level, fmt, args);
    va_end(args);
  }

  ATTRIBUTE_PRINTF(3, 0)
  void vwrite(LogLevelType level, const char* fmt, va_list args) {
    if (!_buf) create_async_buffer();
    _buf->vwrite(level, fmt, args);
  }

#define LOG_LEVEL(level, name) ATTRIBUTE_PRINTF(2, 0) \
  AsyncLogImpl& v##name(const char* fmt, va_list args) { \
    vwrite(LogLevel::level, fmt, args); \
    return *this; \
  } \
  AsyncLogImpl& name(const char* fmt, ...) ATTRIBUTE_PRINTF(2, 3) { \
    va_list args; \
    va_start(args, fmt); \
    vwrite(LogLevel::level, fmt, args); \
    va_end(args); \
    return *this; \
  } \
  static bool is_##name() { \
    return is_level(LogLevel::level); \
  } \
  static AsyncLogTargetImpl<LogLevel::level, T0, T1, T2, T3, T4, GuardTag>* name() { \
    return (AsyncLogTargetImpl<LogLevel::level, T0, T1, T2, T3, T4, GuardTag>*)NULL; \
  }
  LOG_LEVEL_LIST
#undef LOG_LEVEL
};

// Combines logging tags and a logging level.
template <LogLevelType level, LogTagType T0, LogTagType T1 = LogTag::__NO_TAG, LogTagType T2 = LogTag::__NO_TAG,
          LogTagType T3 = LogTag::__NO_TAG, LogTagType T4 = LogTag::__NO_TAG, LogTagType GuardTag = LogTag::__NO_TAG>
class AsyncLogTargetImpl {
public:
  // Empty constructor to avoid warnings on MSVC about unused variables
  // when the log instance is only used for static functions.
  AsyncLogTargetImpl() {
  }

  static bool is_enabled() {
    return AsyncLogImpl<T0, T1, T2, T3, T4, GuardTag>::is_level(level);
  }

  static void print(const char* fmt, ...) ATTRIBUTE_PRINTF(1, 2) {
    AsyncLogImpl<T0, T1, T2, T3, T4, GuardTag> impl;
    va_list args;

    va_start(args, fmt);
    impl.vwrite(level, fmt, args);
    va_end(args);
  }

};

#endif // SHARE_LOGGING_ASYNCLOG_HPP