//===--- Logging.cpp ------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

#include "SourceKit/Support/Logging.h"
#include "SourceKit/Support/UIdent.h"
#include "llvm/Config/config.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Mutex.h"
#include "llvm/Support/Timer.h"

#if HAVE_PTHREAD_H
#include <pthread.h>
#endif

#if __APPLE__
#include <asl.h>
#endif

using namespace SourceKit;

static llvm::sys::Mutex LoggingMutex;

std::string Logger::LoggerName;
Logger::Level Logger::LoggingLevel = Logger::Level::None;

Logger &Logger::operator<<(UIdent UID) {
  *this << UID.getName();
  return *this;
}

Logger &Logger::operator<<(const llvm::format_object_base &Fmt) {
  LogOS << Fmt;
  return *this;
}

Logger::~Logger() {
  llvm::sys::ScopedLock L(LoggingMutex);

  static llvm::TimeRecord sBeginTR = llvm::TimeRecord::getCurrentTime();

  SmallString<64> LogMsg;
  llvm::raw_svector_ostream LogMsgOS(LogMsg);
  raw_ostream &OS = LogMsgOS;

  OS << '[' << int(CurrLevel) << ':' << Name << ':';

  // FIXME: Portability.
#if HAVE_PTHREAD_H && __APPLE__
  mach_port_t tid = pthread_mach_thread_np(pthread_self());
  OS << tid << ':';
#endif

  llvm::TimeRecord TR = llvm::TimeRecord::getCurrentTime();
  OS << llvm::format("%7.4f] ", TR.getWallTime() - sBeginTR.getWallTime());
  OS << Msg.str();

  llvm::errs() << LoggerName << ": " << LogMsg.str() << '\n';

#if __APPLE__
  // Use the Apple System Log facility.
  aslclient asl = asl_open(LoggerName.c_str(), "com.apple.console",
                           ASL_OPT_NO_DELAY);
  aslmsg msg = asl_new(ASL_TYPE_MSG);
  static const char *levstr[] = {"0", "1", "2", "3", "4", "5", "6", "7"};
  asl_set(msg, ASL_KEY_LEVEL, levstr[int(CurrLevel)]);
  asl_set(msg, ASL_KEY_MSG, LogMsg.c_str());
  asl_send(asl, msg);
  asl_free(msg);
  asl_close(asl);
#endif
}