// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
// source code may only be used and distributed under the Widevine License
// Agreement.
//
// Log - implemented using the standard Android logging mechanism

/*
 * Qutoing from system/core/include/log/log.h:
 * Normally we strip ALOGV (VERBOSE messages) from release builds.
 * You can modify this (for example with "#define LOG_NDEBUG 0"
 * at the top of your source file) to change that behavior.
 */
#ifndef LOG_NDEBUG
#  ifdef NDEBUG
#    define LOG_NDEBUG 1
#  else
#    define LOG_NDEBUG 0
#  endif
#endif

#define LOG_TAG "WVCdm"
#define LOG_BUF_SIZE 5120

#include "log.h"
#include <hwbinder/IPCThreadState.h>
#include <utils/Log.h>

#include <stdarg.h>
#include <stdio.h>
#include <sys/time.h>

#include <mutex>
#include <string>

/*
 * Uncomment the line below if you want to have the LOGV messages to print
 * IMPORTANT : this will affect all of CDM
 */

// #define LOG_NDEBUG 0

namespace wvutil {

namespace {
int64_t GetCurrentTimeMs() {
  struct timeval tv {};
  gettimeofday(&tv, NULL);
  auto msec1 = static_cast<int64_t>(tv.tv_sec) * 1000;
  auto msec2 = static_cast<int64_t>(tv.tv_usec) / 1000;
  return msec1 + msec2;
}
}  // namespace

LogPriority g_cutoff = LOG_VERBOSE;

LogBuffer g_logbuf;

thread_local bool tl_logging_uid_set_ = false;

thread_local uint32_t tl_logging_uid_ = UNKNOWN_UID;

void SetLoggingUid(const uint32_t uid) {
  tl_logging_uid_set_ = true;
  tl_logging_uid_ = uid;
}

void ClearLoggingUid() {
  tl_logging_uid_set_ = false;
  tl_logging_uid_ = UNKNOWN_UID;
}

uint32_t GetLoggingUid() { return tl_logging_uid_; }

uint32_t GetIpcCallingUid() {
  const auto self = android::hardware::IPCThreadState::selfOrNull();
  return self ? self->getCallingUid() : UNKNOWN_UID;
}

void InitLogging() {}

void Log(const char* file, const char* function, int line, LogPriority level,
         const char* format, ...) {
  const char* filename = strrchr(file, '/');
  filename = filename == nullptr ? file : filename + 1;

  static thread_local char buf[LOG_BUF_SIZE];
  int len =
      snprintf(buf, LOG_BUF_SIZE, "[%s(%d):%s] ", filename, line, function);
  if (len < 0) len = 0;
  if (static_cast<unsigned int>(len) < sizeof(buf)) {
    va_list ap;
    va_start(ap, format);
    vsnprintf(buf + len, LOG_BUF_SIZE - len, format, ap);
    va_end(ap);
  }

  android_LogPriority prio = ANDROID_LOG_VERBOSE;

  switch (level) {
    case LOG_SILENT:
      return;  // It is nonsensical to pass LOG_SILENT.
    case LOG_ERROR:
      prio = ANDROID_LOG_ERROR;
      break;
    case LOG_WARN:
      prio = ANDROID_LOG_WARN;
      break;
    case LOG_INFO:
      prio = ANDROID_LOG_INFO;
      break;
    case LOG_DEBUG:
      prio = ANDROID_LOG_DEBUG;
      break;
#if LOG_NDEBUG
    case LOG_VERBOSE:
      return;
#else
    case LOG_VERBOSE:
      prio = ANDROID_LOG_VERBOSE;
      break;
#endif
  }

  __android_log_write(prio, LOG_TAG, buf);
  if (level <= LOG_INFO) {
    uint32_t uid = tl_logging_uid_set_ ? tl_logging_uid_ : GetIpcCallingUid();
    g_logbuf.addLog({uid, GetCurrentTimeMs(), level, buf});
  }
}

void LogBuffer::addLog(const LogMessage& log) {
  std::unique_lock<std::mutex> lock(mutex_);
  buffer_.push_back(log);
  while (buffer_.size() > MAX_CAPACITY) {
    buffer_.pop_front();
  }
}

std::vector<LogMessage> LogBuffer::getLogs() {
  std::unique_lock<std::mutex> lock(mutex_);
  return {buffer_.begin(), buffer_.end()};
}

}  // namespace wvutil