/*
 * Copyright (C) 2017 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.
 */

#ifndef CHRE_HOST_LOG_H_
#define CHRE_HOST_LOG_H_

#ifndef LOG_TAG
#define LOG_TAG "CHRE"
#endif

#include <log/log.h>

/**
 * Logs a message to both logcat and stdout. Don't use this directly; prefer one
 * of LOGE, LOGW, etc. to populate the level. Use LOG_PRI directly rather than
 * ALOG to avoid misinterpreting LOG_* macros that may be incorrectly evaluated.
 *
 * @param level log level to pass to ALOG (LOG_ERROR, LOG_WARN, etc.)
 * @param stream output stream to print to (e.g. stdout)
 * @param format printf-style format string
 */
#define CHRE_LOG(level, stream, format, ...)                                   \
  do {                                                                         \
    LOG_PRI(ANDROID_##level, LOG_TAG, format, ##__VA_ARGS__);                  \
    fprintf(stream, "%s:%d: " format "\n", __func__, __LINE__, ##__VA_ARGS__); \
  } while (0)

#define LOGE(format, ...) CHRE_LOG(LOG_ERROR, stderr, format, ##__VA_ARGS__)
#define LOGW(format, ...) CHRE_LOG(LOG_WARN, stdout, format, ##__VA_ARGS__)
#define LOGI(format, ...) CHRE_LOG(LOG_INFO, stdout, format, ##__VA_ARGS__)
#define LOGD(format, ...) CHRE_LOG(LOG_DEBUG, stdout, format, ##__VA_ARGS__)

#if LOG_NDEBUG
__attribute__((format(printf, 1, 2))) inline void chreLogNull(
    const char * /*fmt*/, ...) {}

#define LOGV(format, ...) chreLogNull(format, ##__VA_ARGS__)
#else
#define LOGV(format, ...) CHRE_LOG(LOG_VERBOSE, stdout, format, ##__VA_ARGS__)
#endif

/**
 * Helper to log a library error with a human-readable version of the provided
 * error code.
 *
 * @param message Error message string to log
 * @param error_code Standard error code number (EINVAL, etc)
 */
#define LOG_ERROR(message, error_code)                          \
  do {                                                          \
    char error_string[64];                                      \
    strerror_r(error_code, error_string, sizeof(error_string)); \
    LOGE("%s: %s (%d)\n", message, error_string, error_code);   \
  } while (0)

#endif  // CHRE_HOST_LOG_H_