/* Copyright 2015 Google Inc. All Rights Reserved.

Licensed 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 "tensorflow/core/platform/default/logging.h"
#include "tensorflow/core/platform/macros.h"

#if defined(PLATFORM_POSIX_ANDROID)
#include <android/log.h>
#include <iostream>
#include <sstream>
#endif

#include <stdlib.h>

namespace tensorflow {
namespace internal {

LogMessage::LogMessage(const char* fname, int line, int severity)
    : fname_(fname), line_(line), severity_(severity) {}

#if defined(PLATFORM_POSIX_ANDROID)
void LogMessage::GenerateLogMessage() {
  int android_log_level;
  switch (severity_) {
    case INFO:
      android_log_level = ANDROID_LOG_INFO;
      break;
    case WARNING:
      android_log_level = ANDROID_LOG_WARN;
      break;
    case ERROR:
      android_log_level = ANDROID_LOG_ERROR;
      break;
    case FATAL:
      android_log_level = ANDROID_LOG_FATAL;
      break;
    default:
      if (severity_ < INFO) {
        android_log_level = ANDROID_LOG_VERBOSE;
      } else {
        android_log_level = ANDROID_LOG_ERROR;
      }
      break;
  }

  std::stringstream ss;
  const char* const partial_name = strrchr(fname_, '/');
  ss << (partial_name != nullptr ? partial_name + 1 : fname_) << ":" << line_
     << " " << str();
  __android_log_write(android_log_level, "native", ss.str().c_str());

  // Also log to stderr (for standalone Android apps).
  std::cerr << "native : " << ss.str() << std::endl;

  // Android logging at level FATAL does not terminate execution, so abort()
  // is still required to stop the program.
  if (severity_ == FATAL) {
    abort();
  }
}

#else

void LogMessage::GenerateLogMessage() {
  // TODO(jeff,sanjay): For open source version, replace this with something
  // that logs through the env or something and fill in appropriate time info.
  fprintf(stderr, "%c %s:%d] %s\n", "IWEF"[severity_], fname_, line_,
          str().c_str());
}
#endif

LogMessage::~LogMessage() { GenerateLogMessage(); }

LogMessageFatal::LogMessageFatal(const char* file, int line)
    : LogMessage(file, line, FATAL) {}
LogMessageFatal::~LogMessageFatal() {
  // abort() ensures we don't return (we promised we would not via
  // ATTRIBUTE_NORETURN).
  GenerateLogMessage();
  abort();
}

template <>
void MakeCheckOpValueString(std::ostream* os, const char& v) {
  if (v >= 32 && v <= 126) {
    (*os) << "'" << v << "'";
  } else {
    (*os) << "char value " << (short)v;
  }
}

template <>
void MakeCheckOpValueString(std::ostream* os, const signed char& v) {
  if (v >= 32 && v <= 126) {
    (*os) << "'" << v << "'";
  } else {
    (*os) << "signed char value " << (short)v;
  }
}

template <>
void MakeCheckOpValueString(std::ostream* os, const unsigned char& v) {
  if (v >= 32 && v <= 126) {
    (*os) << "'" << v << "'";
  } else {
    (*os) << "unsigned char value " << (unsigned short)v;
  }
}

#if LANG_CXX11
template <>
void MakeCheckOpValueString(std::ostream* os, const std::nullptr_t& p) {
  (*os) << "nullptr";
}
#endif

CheckOpMessageBuilder::CheckOpMessageBuilder(const char* exprtext)
    : stream_(new std::ostringstream) {
  *stream_ << "Check failed: " << exprtext << " (";
}

CheckOpMessageBuilder::~CheckOpMessageBuilder() { delete stream_; }

std::ostream* CheckOpMessageBuilder::ForVar2() {
  *stream_ << " vs. ";
  return stream_;
}

string* CheckOpMessageBuilder::NewString() {
  *stream_ << ")";
  return new string(stream_->str());
}

}  // namespace internal
}  // namespace tensorflow
