/**
 * @file log.h
 *
 * @brief Simple log message
 *
 * This file is part of the bladeRF project:
 *   http://www.github.com/nuand/bladeRF
 *
 * Copyright (c) 2013 Nuand LLC.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#ifndef LOG_H__
#define LOG_H__

#include <stdio.h>
#include <inttypes.h>

#include "libbladeRF.h"

#ifdef __cplusplus
extern "C" {
#endif

#ifdef SHORT_FILE_
#   define  THIS_FILE  SHORT_FILE_
#else
#if 0
#   warning "SHORT_FILE_ was not defined. Using __FILE__ instead."
#endif
#   define  THIS_FILE   __FILE__
#endif

#define LOG_STRINGIFY__(x)         #x
#define LOG_STRINGIFY_(x)          LOG_STRINGIFY__(x)

#define LOG_EXPAND__(x) #x
#define LOG_EXPAND_(x) LOG_EXPAND__(x)

/**
 * @defgroup LOG_MACROS Logging macros
 * @{
 */

/** Logs a verbose message. Does not include function/line information */
#define log_verbose(...) \
    LOG_WRITE(BLADERF_LOG_LEVEL_VERBOSE, "[VERBOSE", __VA_ARGS__)

/** Logs a debug message. Does not include function/line information */
#define log_debug(...) \
    LOG_WRITE(BLADERF_LOG_LEVEL_DEBUG, "[DEBUG", __VA_ARGS__)

/** Logs an info message. Does not include function/line information*/
#define log_info(...) \
    LOG_WRITE(BLADERF_LOG_LEVEL_INFO, "[INFO", __VA_ARGS__)

/** Logs a warning message. Includes function/line information */
#define log_warning(...) \
    LOG_WRITE(BLADERF_LOG_LEVEL_WARNING, "[WARNING", __VA_ARGS__)

/** Logs an error message. Includes function/line information */
#define log_error(...) \
    LOG_WRITE(BLADERF_LOG_LEVEL_ERROR, "[ERROR", __VA_ARGS__)

/** Logs a critical error message. Includes function/line information */
#define log_critical(...) \
    LOG_WRITE(BLADERF_LOG_LEVEL_CRITICAL, "[CRITICAL", __VA_ARGS__)

/** @} */

#ifdef LOG_INCLUDE_FILE_INFO
#   define LOG_WRITE(LEVEL, LEVEL_STRING, ...) \
    do { log_write(LEVEL, LEVEL_STRING  \
                     " @ "  LOG_EXPAND_(THIS_FILE) \
                     ":" LOG_STRINGIFY_(__LINE__) "] " \
                     __VA_ARGS__); \
    } while (0)
#else
#   define LOG_WRITE(LEVEL, LEVEL_STRING, ...) \
    do { log_write(LEVEL, LEVEL_STRING "] " __VA_ARGS__); } while (0)
#endif

/**
 * Writes a message to the logger with the specified log level. This function
 * should only be invoked indirectly through one of the log_*
 * convenience macros above to ensure consistent formatting of log messages.
 *
 * @param   level       The severity level of the message
 * @param   format      The printf-style format string
 * @param   ...         Optional values for format specifier substitution
 */
#ifdef LOGGING_ENABLED
void log_write(bladerf_log_level level, const char *format, ...);
#else
#define log_write(level, format, ...) do {} while(0)
#endif


/**
 * Sets the filter level for displayed log messages. Messages that are at
 * or above the specified log level will be written to the log output, while
 * messages with a lower log level will be suppressed. This function returns
 * the previous log level.
 *
 * @param   level       The new log level filter value
 */
#ifdef LOGGING_ENABLED
void log_set_verbosity(bladerf_log_level level);
#else
#define log_set_verbosity(level) do {} while (0)
#endif

/**
 * @brief      Gets the current filter level for displayed log messages.
 *
 * @return     bladerf_log_level
 */
#ifdef LOGGING_ENABLED
bladerf_log_level log_get_verbosity();
#else
#define log_get_verbosity(...) BLADERF_LOG_LEVEL_SILENT
#endif

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif