/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */

#ifndef PIPEWIRE_LOG_H
#define PIPEWIRE_LOG_H

#include <spa/support/log.h>
#include <spa/utils/defs.h>

#ifdef __cplusplus
extern "C" {
#endif

/** \defgroup pw_log Logging
 *
 * \brief Logging functions of PipeWire
 *
 * Logging is performed to stdout and stderr. Trace logging is performed
 * in a lockfree ringbuffer and written out from the main thread as to not
 * block the realtime threads.
 */

/**
 * \addtogroup pw_log
 * \{
 */
/** The global log level */
extern enum spa_log_level pw_log_level;

extern struct spa_log_topic * const PW_LOG_TOPIC_DEFAULT;

/** Configure a logging module. This is usually done automatically
 * in pw_init() but you can install a custom logger before calling
 * pw_init(). */
void pw_log_set(struct spa_log *log);

/** Get the log interface */
struct spa_log *pw_log_get(void);

/** Configure the logging level */
void pw_log_set_level(enum spa_log_level level);

/**
 * Configure the logging level using a string
 * in PIPEWIRE_DEBUG format.
 *
 * \since 1.1.0
 */
int pw_log_set_level_string(const char *str);

/** Log a message for a topic */
void
pw_log_logt(enum spa_log_level level,
	    const struct spa_log_topic *topic,
	    const char *file,
	    int line, const char *func,
	    const char *fmt, ...) SPA_PRINTF_FUNC(6, 7);

/** Log a message for a topic */
void
pw_log_logtv(enum spa_log_level level,
	     const struct spa_log_topic *topic,
	     const char *file,
	     int line, const char *func,
	     const char *fmt, va_list args) SPA_PRINTF_FUNC(6, 0);



/** Log a message for the default topic */
void
pw_log_log(enum spa_log_level level,
	   const char *file,
	   int line, const char *func,
	   const char *fmt, ...) SPA_PRINTF_FUNC(5, 6);

/** Log a message for the default topic */
void
pw_log_logv(enum spa_log_level level,
	    const char *file,
	    int line, const char *func,
	    const char *fmt, va_list args) SPA_PRINTF_FUNC(5, 0);

/**
 * Define a static \ref spa_log_topic and its constructor/destructor functions.
 *
 * \since 1.1.0
 */
#define PW_LOG_TOPIC_DEFINE_STATIC(var, topic) \
  static struct spa_log_topic var = SPA_LOG_TOPIC(SPA_VERSION_LOG_TOPIC, topic); \
  static void __attribute__((constructor)) var ## _register_construct(void) { pw_log_topic_register(&var); } \
  static void __attribute__((destructor)) var ## _register_destroy(void) { pw_log_topic_unregister(&var); }

/**
 * Declare a static log topic named \a var. The usual usage is:
 * \code
 *  PW_LOG_TOPIC_STATIC(my_topic);
 *  #define PW_LOG_TOPIC_DEFAULT my_topic
 *
 *  void foo() {
 *      pw_log_debug("bar");
 *  }
 * \endcode
 *
 * This macro also emits GCC attribute constructor/destructor
 * functions that automatically call pw_log_topic_register/unregister.
 */
#define PW_LOG_TOPIC_STATIC(var, topic) \
  PW_LOG_TOPIC_DEFINE_STATIC(var ## _value, topic) \
  static struct spa_log_topic * const var = &(var ## _value)

/**
 * Declare a static log topic named \a var.
 * See \ref PW_LOG_TOPIC_STATIC for an example usage.
 */
#define PW_LOG_TOPIC_EXTERN(var) \
  extern struct spa_log_topic * const var

/**
 * Declare a static log topic named \a var.
 * See \ref PW_LOG_TOPIC_STATIC for an example usage.
 */
#define PW_LOG_TOPIC(var, topic) \
  PW_LOG_TOPIC_DEFINE_STATIC(var ## _value, topic) \
  struct spa_log_topic * const var = &(var ## _value)

/**
 * \deprecated Use \ref pw_log_topic_register and \ref pw_log_topic_unregister
 * instead, or rely on the auto-registration by \ref PW_LOG_TOPIC and
 * \ref PW_LOG_TOPIC_STATIC.
 */
#define PW_LOG_TOPIC_INIT(var) \
   spa_log_topic_init(pw_log_get(), var);

/**
 * Register log topic with the logger, to enable dynamic log levels.
 * Topic must be unregistered before freeing it or plugin unload.
 * May be used instead of \ref PW_LOG_TOPIC_INIT
 * This function is threadsafe.
 *
 * \since 1.1.0
 */
void pw_log_topic_register(struct spa_log_topic *t);

/**
 * Unregister log topic. This function is threadsafe.
 *
 * \since 1.1.0
 */
void pw_log_topic_unregister(struct spa_log_topic *t);

/** Check if a loglevel is enabled */
#define pw_log_level_enabled(lev) (pw_log_level >= (lev))
#define pw_log_topic_enabled(lev,t) ((t) && (t)->has_custom_level ? (t)->level >= (lev) : pw_log_level_enabled((lev)))

/* check is a custom level was assigned to a topic. \since 1.1.0 */
#define pw_log_topic_custom_enabled(lev,t) ((t) && (t)->has_custom_level && (t)->level >= (lev))

#define pw_logtv(lev,topic,fmt,ap)						\
({										\
	if (SPA_UNLIKELY(pw_log_topic_enabled(lev,topic)))			\
		pw_log_logtv(lev,topic,__FILE__,__LINE__,__func__,fmt,ap);	\
})

#define pw_logt(lev,topic,...)							\
({										\
	if (SPA_UNLIKELY(pw_log_topic_enabled(lev,topic)))			\
		pw_log_logt(lev,topic,__FILE__,__LINE__,__func__,__VA_ARGS__);	\
})

#define pw_log(lev,...) pw_logt(lev,PW_LOG_TOPIC_DEFAULT,__VA_ARGS__)

#define pw_log_error(...)   pw_log(SPA_LOG_LEVEL_ERROR,__VA_ARGS__)
#define pw_log_warn(...)    pw_log(SPA_LOG_LEVEL_WARN,__VA_ARGS__)
#define pw_log_info(...)    pw_log(SPA_LOG_LEVEL_INFO,__VA_ARGS__)
#define pw_log_debug(...)   pw_log(SPA_LOG_LEVEL_DEBUG,__VA_ARGS__)
#define pw_log_trace(...)   pw_log(SPA_LOG_LEVEL_TRACE,__VA_ARGS__)

#define pw_logt_error(t,...)   pw_logt(SPA_LOG_LEVEL_ERROR,t,__VA_ARGS__)
#define pw_logt_warn(t,...)    pw_logt(SPA_LOG_LEVEL_WARN,t,__VA_ARGS__)
#define pw_logt_info(t,...)    pw_logt(SPA_LOG_LEVEL_INFO,t,__VA_ARGS__)
#define pw_logt_debug(t,...)   pw_logt(SPA_LOG_LEVEL_DEBUG,t,__VA_ARGS__)
#define pw_logt_trace(t,...)   pw_logt(SPA_LOG_LEVEL_TRACE,t,__VA_ARGS__)

#ifndef FASTPATH
#define pw_log_trace_fp(...)   pw_log(SPA_LOG_LEVEL_TRACE,__VA_ARGS__)
#else
#define pw_log_trace_fp(...)
#endif

/**
 * \}
 */

#ifdef __cplusplus
}
#endif
#endif /* PIPEWIRE_LOG_H */