// Copyright (C) 2020 Joel Rosdahl and other contributors
//
// See doc/AUTHORS.adoc for a complete list of contributors.
//
// 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, write to the Free Software Foundation, Inc., 51
// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

#include "system.hpp"

#ifdef MTR_ENABLED

#  include "ArgsInfo.hpp"
#  include "MiniTrace.hpp"
#  include "TemporaryFile.hpp"
#  include "Util.hpp"
#  include "fmtmacros.hpp"

#  ifdef HAVE_SYS_TIME_H
#    include <sys/time.h>
#  endif

namespace {

std::string
get_system_tmp_dir()
{
#  ifndef _WIN32
  const char* tmpdir = getenv("TMPDIR");
  if (tmpdir) {
    return tmpdir;
  }
#  else
  static char dirbuf[PATH_MAX];
  DWORD retval = GetTempPath(PATH_MAX, dirbuf);
  if (retval > 0 && retval < PATH_MAX) {
    return dirbuf;
  }
#  endif
  return "/tmp";
}

double
time_seconds()
{
#  ifdef HAVE_GETTIMEOFDAY
  struct timeval tv;
  gettimeofday(&tv, nullptr);
  return (double)tv.tv_sec + (double)tv.tv_usec / 1000000.0;
#  else
  return (double)time(nullptr);
#  endif
}

} // namespace

MiniTrace::MiniTrace(const ArgsInfo& args_info)
  : m_args_info(args_info), m_trace_id(reinterpret_cast<void*>(getpid()))
{
  TemporaryFile tmp_file(get_system_tmp_dir() + "/ccache-trace");
  m_tmp_trace_file = tmp_file.path;

  mtr_init(m_tmp_trace_file.c_str());
  MTR_INSTANT_C("", "", "time", FMT("{:f}", time_seconds()).c_str());
  MTR_META_PROCESS_NAME("ccache");
  MTR_START("program", "ccache", m_trace_id);
}

MiniTrace::~MiniTrace()
{
  MTR_FINISH("program", "ccache", m_trace_id);
  mtr_flush();
  mtr_shutdown();

  if (!m_args_info.output_obj.empty()) {
    Util::copy_file(m_tmp_trace_file, m_args_info.output_obj + ".ccache-trace");
  }
  Util::unlink_tmp(m_tmp_trace_file);
}

#endif
