#pragma once

#ifdef __cplusplus
extern "C" {
#endif // __cplusplus

#include <stdio.h>

/**
 * The verbosity level of a log event.
 */
enum log_Level {
    Trace, //!< Designates very low priority, often extremely verbose, information.
    Debug, //!< Designates lower priority information.
    Info, //!< Designates useful information.
    Warn, //!< Designates hazardous situations.
    Error, //!< Designates very serious errors.
};

/**
 * The type of a log event function.
 *
 * @param level The verbosity level of the event.
 * @param msg The string message to be logged.
 */
typedef void (*log_LogFn)(enum log_Level level, const char *msg);

/**
 * Set the global event logging function.
 *
 * @param fn_ptr A pointer to the event logging function. If `NULL`, the global logger is unset.
 */
void log_set(log_LogFn fn_ptr);

/**
 * The inner logging function, this should not be called directly, instead the macros defined in the same header
 * should be used..
 *
 * @param level The verbosity level of the event.
 * @param msg The string message to be logged.
 */
void inner_log(enum log_Level level, const char *msg);

#define LOG_MSG_SIZE(message, ...) sizeof(message)
#define INNER_LOG(level, ...) { char tmp[LOG_MSG_SIZE(__VA_ARGS__) + 256]; snprintf(tmp, sizeof(tmp), __VA_ARGS__); inner_log(level, tmp); }(0)

#define LOG_TRACE(...) INNER_LOG(Trace, __VA_ARGS__)
#define LOG_DEBUG(...) INNER_LOG(Debug, __VA_ARGS__)
#define LOG_INFO(...) INNER_LOG(Info, __VA_ARGS__)
#define LOG_WARN(...) INNER_LOG(Warn, __VA_ARGS__)
#define LOG_ERROR(...) INNER_LOG(Error, __VA_ARGS__)

#ifdef __cplusplus
}
#endif // __cplusplus