/*
    gutenfetch - a small utility to list and fetch books available through
	project gutenberg

    Copyright (C) 2001, 2002, 2003 Russell Francis 

    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

Last updated on $Date: 2004/03/21 05:14:13 $ by $Author: johntabularasa $.
*/
#include "stddefs.h"
#include "libgutenfetch_error.h"
#ifdef HAVE_STRING_H
#	include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#	include <strings.h>
#endif
#ifdef HAVE_STDIO_H
#	include <stdio.h>
#endif
#ifdef HAVE_ERRNO_H
#	include <errno.h>
#endif
#ifdef HAVE_STDLIB_H
#	include <stdlib.h>
#endif

static char *error_messages[NUM_OF_ERRORS];

/**
 * Initialize internal variables of the error code.
 *
 * This function builds a table of error strings, to be
 * used later if something bad should happen.
 */
void
gutenfetch_error_init(void)
{
	error_messages[GUTENFETCH_OK] = 
		(char*)_("The operation was successful.");
	error_messages[GUTENFETCH_UNRECOGNIZED_ERROR] =
		(char*)_("The error code is unrecognized.");
	error_messages[GUTENFETCH_SEE_ERRNO] = (char*)"";
	error_messages[GUTENFETCH_NOMEM] = 
		(char*)_("Memory allocation failure.");
	error_messages[GUTENFETCH_CURL_GLOBAL_INIT_FAILED] = 
		(char*)_("The global initialization of CURL failed.");
	error_messages[GUTENFETCH_CURL_PERFORM_FAILED] = 
		(char*)_("CURL was unable to perform the requested file transfer.");
	error_messages[GUTENFETCH_CURL_GET_HANDLE_FAILED] =
		(char*)_("An attempt to get a CURL handle has failed.");
	error_messages[GUTENFETCH_BAD_PARAM] =
		(char*)_("A bad parameter has been passed to an internal function.");
	error_messages[GUTENFETCH_NO_ACTIVE_SERVER] =
		(char*)_("There is no currently active gutenfetch server.");
	error_messages[GUTENFETCH_UNABLE_TO_DETAIL_LISTING] =
		(char*)_("Unable to detail the ebook listings.");
	error_messages[GUTENFETCH_UNABLE_TO_INIT_CACHE] = 
		(char *)_("Unable to initialize the cache directory.");
}

/**
 * Release the resources used by the error code.
 */
void
gutenfetch_error_shutdown(void) 
{
}

/**
 * Convert a gutenfetch_error_t code into a human readable string.
 *
 * @param error_code The numeric representation of the error.
 * @return A NULL-terminated human-readable error string.
 */
const char *
gutenfetch_error_to_string(gutenfetch_error_t error_code)
{
	char *errmsg = NULL;
	
	switch (error_code) {
	case GUTENFETCH_SEE_ERRNO:
		errmsg = strerror(errno);
		break;
	case GUTENFETCH_BAD_PARAM:
	case GUTENFETCH_NOMEM:
	case GUTENFETCH_CURL_GLOBAL_INIT_FAILED:
	case GUTENFETCH_CURL_GET_HANDLE_FAILED:
	case GUTENFETCH_CURL_PERFORM_FAILED:
	case GUTENFETCH_NO_ACTIVE_SERVER:
	case GUTENFETCH_UNABLE_TO_DETAIL_LISTING:
	case GUTENFETCH_UNABLE_TO_INIT_CACHE:
	case GUTENFETCH_OK:
		errmsg = error_messages[error_code];
		break;
	case GUTENFETCH_UNRECOGNIZED_ERROR:	
	default:
		errmsg = error_messages[GUTENFETCH_UNRECOGNIZED_ERROR];
		break;
	}
	
	return errmsg;
}