/*
 * Copyright 2023 The Android Open Source Project
 *
 * 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 <log/log.h>

#include "bluetooth/log.h"
#include "truncating_buffer.h"

namespace bluetooth::log_internal {

static constexpr std::string_view kAndroidRepoLocation = "packages/modules/Bluetooth/";

static constexpr size_t kBufferSize = 1024;

void vlog(Level level, char const* tag, source_location location, std::string_view fmt,
          std::format_args vargs) {
  // Check if log is enabled.
  if (!__android_log_is_loggable(level, "bluetooth", ANDROID_LOG_INFO)) {
    return;
  }

  // Strip prefix of file_name to remove kAndroidRepoLocation if present
  const char* file_name = location.file_name;
  if (strncmp(kAndroidRepoLocation.data(), location.file_name, kAndroidRepoLocation.size()) == 0) {
    file_name = location.file_name + kAndroidRepoLocation.size();
  }

  // Format to stack buffer.
  // liblog uses a different default depending on the execution context
  // (host or device); the file and line are not systematically included.
  // In order to have consistent logs we include it manually in the log
  // message.
  truncating_buffer<kBufferSize> buffer;
  std::format_to(std::back_insert_iterator(buffer), "{}:{} {}: ", file_name, location.line,
                 location.function_name);
  std::vformat_to(std::back_insert_iterator(buffer), fmt, vargs);

  // Send message to liblog.
  struct __android_log_message message = {
          .struct_size = sizeof(__android_log_message),
          .buffer_id = LOG_ID_MAIN,
          .priority = static_cast<android_LogPriority>(level),
          .tag = tag,
          .file = nullptr,
          .line = 0,
          .message = buffer.c_str(),
  };
  __android_log_write_log_message(&message);

  if (level == Level::kFatal) {
    // Log assertion failures to stderr for the benefit of "adb shell" users
    // and gtests (http://b/23675822).
    char const* buf = buffer.c_str();
    TEMP_FAILURE_RETRY(write(2, buf, strlen(buf)));
    TEMP_FAILURE_RETRY(write(2, "\n", 1));
    __android_log_call_aborter(buf);
  }
}

}  // namespace bluetooth::log_internal