/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "log.h"
#include "configuration.h"

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

int debug_level = -1;

static FILE* log_output;


static void *privData;
static logCallback callback;

void log_setCallback(logCallback c, void *p)
{
	callback=c;
	privData=p;
}

static char *log_strings[4] = 
{
	"Error:  ",
	"Warning:",
	"Info:   ",
	"Debug:  ",
};

void log_printf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
{
	va_list args;
	char buffer[512];

	if (level > debug_level)
		return;

	va_start(args, format);
	vsnprintf(buffer, 512, format, args);

	fprintf(log_output, "%s %s:%d %s(): %s\n", log_strings[level], file, line, function, buffer);
	fflush(log_output);
	
	va_end(args);

	if (callback)
{
	va_start(args, format);

		callback(privData, file, line, function, format, args);

	va_end(args);
}

}

/* change the current debug level on the fly
 * 0: only ERRORS
 * 1: + WARNINGS
 * 2: + INFORMATIONAL MSGS
 * 3: + DEBUG MSGS
 */
int handle_debug_level_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
	if (argc == 0)
		command_print(cmd_ctx, "debug_level: %i", debug_level);

	if (argc > 0)
		debug_level = strtoul(args[0], NULL, 0);

	if (debug_level < 0)
		debug_level = 0;

	if (debug_level > 3)
		debug_level = 3;

	return ERROR_OK;
}

int handle_log_output_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
	if (argc == 1)
	{
		FILE* file = fopen(args[0], "w");
		
		if (file)
		{
			log_output = file;
		}
	}

	return ERROR_OK;
}

int log_register_commands(struct command_context_s *cmd_ctx)
{
	register_command(cmd_ctx, NULL, "log_output", handle_log_output_command,
		COMMAND_ANY, "redirect logging to <file> (default: stderr)");
	register_command(cmd_ctx, NULL, "debug_level", handle_debug_level_command,
		COMMAND_ANY, "adjust debug level <0-3>");

	return ERROR_OK;
}

int log_init(struct command_context_s *cmd_ctx)
{
	/* set defaults for daemon configuration, if not set by cmdline or cfgfile */
	if (debug_level == -1)
		debug_level = LOG_INFO;
	
	if (log_output == NULL)
	{
		log_output = stderr;
	}
	
	return ERROR_OK;
}
	
int set_log_output(struct command_context_s *cmd_ctx, FILE *output)
{
	log_output=output;
	return ERROR_OK;
}

/* return allocated string w/printf() result */
char *allocPrintf(const char *fmt, va_list ap)
{
	char *string=NULL;
	int size=0; // start by 0 to exercise all the code paths. Need minimum 2 bytes to fit 1 char and 0 terminator.
	int first=1;
	for (;;)
	{
		if ((string==NULL)||(!first))
		{
			size=size*2+2;
			char *t=string;
			string=realloc(string, size);
			if (string==NULL)
			{
				if (t!=NULL)
					free(t);
				return NULL;
			}
		}
	
	    int ret;
	    ret = vsnprintf(string, size, fmt, ap);
	    // NB! The result of the vsnprintf() might be an *EMPTY* string!
	    if ((ret>=0)&&((ret+1)<size))
	    {
	    	return string;
	    }
	    // there was just enough or not enough space, allocate more.
	    first=0;
	}
}