/* debug.h -- debug utilities
 *
 * Copyright (C) 2011--2012 Olaf Bergmann <bergmann@tzi.org>
 *
 * 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 _DTLS_DEBUG_H_
#define _DTLS_DEBUG_H_

#include <stdlib.h>

#include "dtls_config.h"
#include "global.h"
#include "session.h"

#ifdef WITH_CONTIKI
# ifndef DEBUG
#  define DEBUG DEBUG_PRINT
# endif /* DEBUG */
#include "contiki/ip/uip-debug.h"

#ifdef CONTIKI_TARGET_MBXXX
extern char __Stack_Init, _estack;

static inline void check_stack() {
  const char *p = &__Stack_Init;
  while (p < &_estack && *p == 0x38) {
    p++;
  }

  PRINTF("Stack: %d bytes used (%d free)\n", &_estack - p, p - &__Stack_Init);
}
#else /* CONTIKI_TARGET_MBXXX */
static inline void check_stack() {
}
#endif /* CONTIKI_TARGET_MBXXX */
#else /* WITH_CONTKI */
#define PRINTF(...)

static inline void check_stack() {
}
#endif

struct __session_t;

/** Pre-defined log levels akin to what is used in \b syslog. */
typedef enum { DTLS_LOG_EMERG=0, DTLS_LOG_ALERT, DTLS_LOG_CRIT, DTLS_LOG_WARN, 
       DTLS_LOG_NOTICE, DTLS_LOG_INFO, DTLS_LOG_DEBUG
} log_t;

/** Returns a zero-terminated string with the name of this library. */
const char *dtls_package_name();

/** Returns a zero-terminated string with the library version. */
const char *dtls_package_version();

#ifndef NDEBUG
/** Returns the current log level. */
log_t dtls_get_log_level();

/** Sets the log level to the specified value. */
void dtls_set_log_level(log_t level);

/** 
 * Writes the given text to \c stdout. The text is output only when \p
 * level is below or equal to the log level that set by
 * set_log_level(). */
#ifdef HAVE_VPRINTF
void dsrv_log(log_t level, char *format, ...);
#else
#define dsrv_log(level, format, ...) PRINTF(format, ##__VA_ARGS__)
#endif

/** dumps packets in usual hexdump format */
void hexdump(const unsigned char *packet, int length);

/** dump as narrow string of hex digits */
void dump(unsigned char *buf, size_t len);

void dtls_dsrv_hexdump_log(log_t level, const char *name, const unsigned char *buf, size_t length, int extend);

void dtls_dsrv_log_addr(log_t level, const char *name, const session_t *addr);

#else /* NDEBUG */

static inline log_t dtls_get_log_level()
{
  return DTLS_LOG_EMERG;
}

static inline void dtls_set_log_level(log_t level)
{}

static inline void dsrv_log(log_t level, char *format, ...)
{}

static inline void hexdump(const unsigned char *packet, int length)
{}

static inline void dump(unsigned char *buf, size_t len)
{}

static inline void
dtls_dsrv_hexdump_log(log_t level, const char *name, const unsigned char *buf, size_t length, int extend)
{}

static inline void
dtls_dsrv_log_addr(log_t level, const char *name, const session_t *addr)
{}

#endif /* NDEBUG */

/* A set of convenience macros for common log levels. */
#define dtls_emerg(...) dsrv_log(DTLS_LOG_EMERG, __VA_ARGS__)
#define dtls_alert(...) dsrv_log(DTLS_LOG_ALERT, __VA_ARGS__)
#define dtls_crit(...) dsrv_log(DTLS_LOG_CRIT, __VA_ARGS__)
#define dtls_warn(...) dsrv_log(DTLS_LOG_WARN, __VA_ARGS__)
#define dtls_notice(...) dsrv_log(DTLS_LOG_NOTICE, __VA_ARGS__)
#define dtls_info(...) dsrv_log(DTLS_LOG_INFO, __VA_ARGS__)
#define dtls_debug(...) dsrv_log(DTLS_LOG_DEBUG, __VA_ARGS__)
#define dtls_debug_hexdump(name, buf, length) dtls_dsrv_hexdump_log(DTLS_LOG_DEBUG, name, buf, length, 1)
#define dtls_debug_dump(name, buf, length) dtls_dsrv_hexdump_log(DTLS_LOG_DEBUG, name, buf, length, 0)

#endif /* _DTLS_DEBUG_H_ */