// Copyright 2012-2016 David Robillard <d@drobilla.net>
// SPDX-License-Identifier: ISC

#ifndef LV2_LOG_LOGGER_H
#define LV2_LOG_LOGGER_H

/**
   @defgroup logger Logger
   @ingroup log

   Convenience API for easy logging in plugin code.  This API provides simple
   wrappers for logging from a plugin, which automatically fall back to
   printing to stderr if host support is unavailable.

   @{
*/

#include "lv2/log/log.h"
#include "lv2/urid/urid.h"

#include <stdarg.h>
#include <stdio.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
   Logger convenience API state.
*/
typedef struct {
  LV2_Log_Log* log;

  LV2_URID Error;
  LV2_URID Note;
  LV2_URID Trace;
  LV2_URID Warning;
} LV2_Log_Logger;

/**
   Set `map` as the URI map for `logger`.

   This affects the message type URIDs (Error, Warning, etc) which are passed
   to the log's print functions.
*/
static inline void
lv2_log_logger_set_map(LV2_Log_Logger* logger, LV2_URID_Map* map)
{
  if (map) {
    logger->Error   = map->map(map->handle, LV2_LOG__Error);
    logger->Note    = map->map(map->handle, LV2_LOG__Note);
    logger->Trace   = map->map(map->handle, LV2_LOG__Trace);
    logger->Warning = map->map(map->handle, LV2_LOG__Warning);
  } else {
    logger->Error = logger->Note = logger->Trace = logger->Warning = 0;
  }
}

/**
   Initialise `logger`.

   URIs will be mapped using `map` and stored, a reference to `map` itself is
   not held.  Both `map` and `log` may be NULL when unsupported by the host,
   in which case the implementation will fall back to printing to stderr.
*/
static inline void
lv2_log_logger_init(LV2_Log_Logger* logger, LV2_URID_Map* map, LV2_Log_Log* log)
{
  logger->log = log;
  lv2_log_logger_set_map(logger, map);
}

/**
   Log a message to the host, or stderr if support is unavailable.
*/
LV2_LOG_FUNC(3, 0)
static inline int
lv2_log_vprintf(LV2_Log_Logger* logger,
                LV2_URID        type,
                const char*     fmt,
                va_list         args)
{
  return ((logger && logger->log)
            ? logger->log->vprintf(logger->log->handle, type, fmt, args)
            : vfprintf(stderr, fmt, args));
}

/** Log an error via lv2_log_vprintf(). */
LV2_LOG_FUNC(2, 3)
static inline int
lv2_log_error(LV2_Log_Logger* logger, const char* fmt, ...)
{
  va_list args;
  va_start(args, fmt);
  const int ret = lv2_log_vprintf(logger, logger->Error, fmt, args);
  va_end(args);
  return ret;
}

/** Log a note via lv2_log_vprintf(). */
LV2_LOG_FUNC(2, 3)
static inline int
lv2_log_note(LV2_Log_Logger* logger, const char* fmt, ...)
{
  va_list args;
  va_start(args, fmt);
  const int ret = lv2_log_vprintf(logger, logger->Note, fmt, args);
  va_end(args);
  return ret;
}

/** Log a trace via lv2_log_vprintf(). */
LV2_LOG_FUNC(2, 3)
static inline int
lv2_log_trace(LV2_Log_Logger* logger, const char* fmt, ...)
{
  va_list args;
  va_start(args, fmt);
  const int ret = lv2_log_vprintf(logger, logger->Trace, fmt, args);
  va_end(args);
  return ret;
}

/** Log a warning via lv2_log_vprintf(). */
LV2_LOG_FUNC(2, 3)
static inline int
lv2_log_warning(LV2_Log_Logger* logger, const char* fmt, ...)
{
  va_list args;
  va_start(args, fmt);
  const int ret = lv2_log_vprintf(logger, logger->Warning, fmt, args);
  va_end(args);
  return ret;
}

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

/**
   @}
*/

#endif // LV2_LOG_LOGGER_H