/* liblouis Braille Translation and Back-Translation  Library

   Copyright (C) 2004, 2005, 2006 ViewPlus Technologies, Inc. www.viewplus.com

   Copyright (C) 2004, 2005, 2006 JJB Software, Inc. www.jjb-software.com

   This file is part of liblouis.

   liblouis is free software: you can redistribute it and/or modify it

   under the terms of the GNU Lesser General Public License as published

   by the Free Software Foundation, either version 2.1 of the License, or

   (at your option) any later version.

   liblouis is distributed in the hope that it will be useful, but

   WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with liblouis. If not, see <http://www.gnu.org/licenses/>.

*/

/**

 * @file

 * @brief Logging

 */

#include <config.h>

#include <stddef.h>

#include <stdlib.h>

#include <stdio.h>

#include <stdarg.h>

#include <string.h>

#include "internal.h"

void EXPORT_CALL

_lou_logWidecharBuf(logLevels level, const char *msg, const widechar *wbuf, int wlen) {

  /* When calculating output size:

   * Each wdiechar is represented in hex, thus needing two bytes for each

   * byte in the widechar (sizeof(widechar) * 2)

   * Allow space for the "0x%X " formatting (+ 3)

   * Number of characters in widechar buffer (wlen * )

   * Give space for additional message (+ strlen(msg))

   * Remember the null terminator (+ 1)

   */

  int logBufSize = (wlen * ((sizeof(widechar) * 3) + 3)) + 3 + (int)strlen(msg);

  char *logMsg = malloc(logBufSize);

  char *p = logMsg;

  const char *formatString;

  int i = 0;

  if (sizeof(widechar) == 2)

    formatString = "0x%04X ";

  else

    formatString = "0x%08X ";

  for (i = 0; i < (int)strlen(msg); i++) logMsg[i] = msg[i];

  p += strlen(msg);

  for (i = 0; i < wlen; i++) {

    p += sprintf(p, formatString, wbuf[i]);

  }

  *p = '~';

  p++;

  *p = ' ';

  p++;

  for (i = 0; i < wlen; i++) {

    if (wbuf[i] & 0xff00)

      *p = ' ';

    else

      *p = (char)wbuf[i];

    p++;

  }

  *p = '\0';

  _lou_logMessage(level, "%s", logMsg);

  free(logMsg);

}

static void EXPORT_CALL

defaultLogCallback(logLevels level, const char *message) {

  lou_logPrint("%s",

      message);  // lou_logPrint takes formatting, protect against % in message

}

static logcallback logCallbackFunction = defaultLogCallback;

void EXPORT_CALL

lou_registerLogCallback(logcallback callback) {

  if (callback == NULL)

    logCallbackFunction = defaultLogCallback;

  else

    logCallbackFunction = callback;

}

static logLevels logLevel = LOU_LOG_INFO;

void EXPORT_CALL

lou_setLogLevel(logLevels level) {

  logLevel = level;

}

void EXPORT_CALL

_lou_logMessage(logLevels level, const char *format, ...) {

  if (format == NULL) return;

  if (level < logLevel) return;

  if (logCallbackFunction != NULL) {

#ifdef _WIN32

    double f = 2.3;  // Needed to force VC++ runtime floating point support

#endif

    char *s;

    size_t len;

    va_list argp;

    va_start(argp, format);

    len = vsnprintf(0, 0, format, argp);

    va_end(argp);

    if ((s = malloc(len + 1)) != 0) {

      va_start(argp, format);

      vsnprintf(s, len + 1, format, argp);

      va_end(argp);

      logCallbackFunction(level, s);

      free(s);

    }

  }

}

#define FILENAMESIZE 256

static FILE *logFile = NULL;

static char initialLogFileName[FILENAMESIZE] = "";

void EXPORT_CALL

lou_logFile(const char *fileName) {

  if (logFile) {

    fclose(logFile);

    logFile = NULL;

  }

  if (fileName == NULL || fileName[0] == 0 || strlen(fileName) >= FILENAMESIZE) return;

  if (initialLogFileName[0] == 0) strcpy(initialLogFileName, fileName);

  logFile = fopen(fileName, "a");

  if (logFile == NULL && initialLogFileName[0] != 0)

    logFile = fopen(initialLogFileName, "a");

  if (logFile == NULL) {

    fprintf(stderr, "Cannot open log file %s\n", fileName);

    logFile = stderr;

  }

}

void EXPORT_CALL

lou_logPrint(const char *format, ...) {

#ifndef __SYMBIAN32__

  va_list argp;

  if (format == NULL) return;

  if (logFile == NULL) logFile = fopen(initialLogFileName, "a");

  if (logFile == NULL) logFile = stderr;

  va_start(argp, format);

  vfprintf(logFile, format, argp);

  fprintf(logFile, "\n");

  fflush(logFile);

  va_end(argp);

#endif

}

/* Close the log file */

void EXPORT_CALL

lou_logEnd(void) {

  if (logFile != NULL && logFile != stderr) fclose(logFile);

  logFile = NULL;

}