//===-- OsLogger.cpp --------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "OsLogger.h"
#include <Availability.h>

#if (LLDB_USE_OS_LOG) && (__MAC_OS_X_VERSION_MAX_ALLOWED >= 101200)

#include <os/log.h>

#include "DNBDefs.h"
#include "DNBLog.h"

#define LLDB_OS_LOG_MAX_BUFFER_LENGTH 256

namespace {
// Darwin os_log logging callback that can be registered with
// DNBLogSetLogCallback
void DarwinLogCallback(void *baton, uint32_t flags, const char *format,
                       va_list args) {
  if (format == nullptr)
    return;

  static os_log_t g_logger;
  if (!g_logger) {
    g_logger = os_log_create("com.apple.dt.lldb", "debugserver");
    if (!g_logger)
      return;
  }

  os_log_type_t log_type;
  if (flags & DNBLOG_FLAG_FATAL)
    log_type = OS_LOG_TYPE_FAULT;
  else if (flags & DNBLOG_FLAG_ERROR)
    log_type = OS_LOG_TYPE_ERROR;
  else if (flags & DNBLOG_FLAG_WARNING)
    log_type = OS_LOG_TYPE_DEFAULT;
  else if (flags & DNBLOG_FLAG_VERBOSE)
    log_type = OS_LOG_TYPE_DEBUG;
  else
    log_type = OS_LOG_TYPE_DEFAULT;

  // This code is unfortunate.  os_log* only takes static strings, but
  // our current log API isn't set up to make use of that style.
  char buffer[LLDB_OS_LOG_MAX_BUFFER_LENGTH];
  vsnprintf(buffer, sizeof(buffer), format, args);
  os_log_with_type(g_logger, log_type, "%{public}s", buffer);
}
}

DNBCallbackLog OsLogger::GetLogFunction() { return DarwinLogCallback; }

#else

DNBCallbackLog OsLogger::GetLogFunction() { return nullptr; }

#endif